FM / Manager

/home/techb158/workloadmatch.com/workloadmatch.com/Manager/

/home/techb158/workloadmatch.com/workloadmatch.com/Manager

Name	Size	Mode	Actions
core/	-	0755	rm
css/	-	0755	rm
data/	-	0755	rm
fonts/	-	0755	rm
Inc/	-	0755	rm
js/	-	0755	rm
php/	-	0755	rm
accesscontrol.php	16039	0644	edit dl rm
AddClient.php	3930	0644	edit dl rm
addcourse.php	17736	0644	edit dl rm
addcoursesession.php	20528	0644	edit dl rm
addcoursetime.php	17305	0644	edit dl rm
addgroup - Copy.php	21212	0644	edit dl rm
addgroup.php	22999	0644	edit dl rm
addgroup1.php	20667	0644	edit dl rm
addholiday.php	18019	0644	edit dl rm
addmanager.php	18765	0644	edit dl rm
addremediation.php	17877	0644	edit dl rm
addretake.php	21914	0644	edit dl rm
adduser.php	30079	0644	edit dl rm
adduser1.php	23527	0644	edit dl rm
Add_Course_Session.php	6529	0644	edit dl rm
add_event.php	1960	0644	edit dl rm
Add_Teacher_Unavailability.php	1746	0644	edit dl rm
adminreports.php	16219	0644	edit dl rm
AI_Generate_Schedule - Copy.php	12217	0644	edit dl rm
AI_Generate_Schedule.php	10731	0644	edit dl rm
ajax_course_group_Backup.php	17270	0644	edit dl rm
ajax_course_group_Backup_1.php	18742	0644	edit dl rm
ajax_fetch_schedule.php	3760	0644	edit dl rm
ajax_get_group_slots.php	872	0644	edit dl rm
ajax_replace_saturday -Completed.php	18739	0644	edit dl rm
ajax_replace_saturday - Copy (2).php	18739	0644	edit dl rm
ajax_replace_saturday - Copy (3).php	26554	0644	edit dl rm
ajax_replace_saturday - Copy (4).php	26615	0644	edit dl rm
ajax_replace_saturday - Copy (5).php	28374	0644	edit dl rm
ajax_replace_saturday - Copy.php	13452	0644	edit dl rm
ajax_replace_saturday - Good.php	17270	0644	edit dl rm
ajax_replace_saturday.php	30779	0644	edit dl rm
ajax_swap_courses.php	4279	0644	edit dl rm
assign_course_group-BackUp.php	21331	0644	edit dl rm
assign_course_group - Copy (BackUp).php	18315	0644	edit dl rm
assign_course_group - Copy.php	21318	0644	edit dl rm
assign_course_group.php	18315	0644	edit dl rm
assign_course_group1.php	20962	0644	edit dl rm
Assign_Course_Report.php	1375	0644	edit dl rm
assign_teacher_manual-1.php	21095	0644	edit dl rm
assign_teacher_manual - Copy (2).php	22328	0644	edit dl rm
assign_teacher_manual - Copy.php	22388	0644	edit dl rm
assign_teacher_manual-Not work.php	20585	0644	edit dl rm
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assign_teacher_manual_force_conflicts.php	22359	0644	edit dl rm
availableteacherreport.php	13718	0644	edit dl rm
Available_Teacher_Report - Copy.php	2236	0644	edit dl rm
Available_Teacher_Report.php	7691	0644	edit dl rm
brokerreports.php	16318	0644	edit dl rm
calendar - Copy (2).php	16891	0644	edit dl rm
calendar - Copy.php	23193	0644	edit dl rm
calendar.php	30653	0644	edit dl rm
changestatus.php	865	0644	edit dl rm
Check_if_Teacher_Report.php	1587	0644	edit dl rm
complete_schedule_report_by_teacher.php	19312	0644	edit dl rm
courseflagtime.php	3411	0644	edit dl rm
Create_Group_Schedule_Algorithm.php	3828	0644	edit dl rm
Create_Schedule_Algorithm - Copy (2).php	41412	0644	edit dl rm
Create_Schedule_Algorithm - Copy (3).php	46352	0644	edit dl rm
Create_Schedule_Algorithm - Copy (4).php	53569	0644	edit dl rm
Create_Schedule_Algorithm - Copy (5).php	67956	0644	edit dl rm
Create_Schedule_Algorithm - Copy (6).php	71134	0644	edit dl rm
Create_Schedule_Algorithm - Copy (7).php	72529	0644	edit dl rm
Create_Schedule_Algorithm - Copy (8).php	73084	0644	edit dl rm
Create_Schedule_Algorithm - Copy (9).php	73577	0644	edit dl rm
Create_Schedule_Algorithm - Copy (10).php	76505	0644	edit dl rm
Create_Schedule_Algorithm - Copy (11).php	76764	0644	edit dl rm
Create_Schedule_Algorithm - Copy (12).php	86324	0644	edit dl rm
Create_Schedule_Algorithm - Copy (13).php	83133	0644	edit dl rm
Create_Schedule_Algorithm - Copy (14).php	87274	0644	edit dl rm
Create_Schedule_Algorithm - Copy (get info only).php	69747	0644	edit dl rm
Create_Schedule_Algorithm - Copy (with 2 course 2nd SPECIAL ).php	82314	0644	edit dl rm
Create_Schedule_Algorithm - Copy.php	40581	0644	edit dl rm
Create_Schedule_Algorithm.php	88276	0644	edit dl rm
Create_Schedule_Algorithm_1.php	41412	0644	edit dl rm
Create_Schedule_Algorithm_2.php	76505	0644	edit dl rm
Create_Schedule_Algorithm_2_combined.php	89764	0644	edit dl rm
Create_Schedule_Algorithm_2_combined_both_slots.php	91932	0644	edit dl rm
Create_Schedule_Algorithm_2_fixed.php	76829	0644	edit dl rm
Create_Schedule_Algorithm_3.php	87274	0644	edit dl rm
Create_Schedule_Algorithm_4.php	87274	0644	edit dl rm
dashboard-BackUp.php	18806	0644	edit dl rm
dashboard.php	22507	0644	edit dl rm
deleteschedulefromgroup.php	16819	0644	edit dl rm
delete_course.php	580	0644	edit dl rm
delete_course_from_teacher.php	4990	0644	edit dl rm
delete_course_from_teacher_backup.php	3094	0644	edit dl rm
delete_event.php	1212	0644	edit dl rm
delete_group.php	1858	0644	edit dl rm
delete_holiday.php	715	0644	edit dl rm
delete_retake.php	1276	0644	edit dl rm
delete_schedule_from_group-1.php	1870	0644	edit dl rm
delete_schedule_from_group.php	1850	0644	edit dl rm
delete_teacher_level.php	798	0644	edit dl rm
delete_teacher_unavailability.php	1347	0644	edit dl rm
delete_timeslot.php	597	0644	edit dl rm
display_schedule-1.php	18846	0644	edit dl rm
display_schedule.php	18846	0644	edit dl rm
do_remove_saturday.php	6170	0644	edit dl rm
edit_event.php	1612	0644	edit dl rm
error_log	74070	0644	edit dl rm
examschedulereport.php	16267	0644	edit dl rm
Exam_Schedule_Report.php	2677	0644	edit dl rm
export_absences.php	1221	0644	edit dl rm
fetch_all_scheduled_courses.php	6318	0644	edit dl rm
fetch_courses - BackUp.php	9711	0644	edit dl rm
fetch_courses - Copy.php	7719	0644	edit dl rm
fetch_courses.php	9167	0644	edit dl rm
fetch_courses_for_program.php	788	0644	edit dl rm
fetch_courses_for_program_by_schedule - Copy.php	2297	0644	edit dl rm
fetch_courses_for_program_by_schedule.php	3935	0644	edit dl rm
fetch_courses_teacher_preference.php	3852	0644	edit dl rm
fetch_course_for_added_group.php	897	0644	edit dl rm
fetch_course_hours.php	691	0644	edit dl rm
fetch_disabled_dates.php	518	0644	edit dl rm
fetch_events.php	975	0644	edit dl rm
fetch_exist_dates.php	1099	0644	edit dl rm
fetch_groups_exist_in_schedule.php	956	0644	edit dl rm
fetch_groups_for_program.php	843	0644	edit dl rm
fetch_group_timeslot.php	847	0644	edit dl rm
fetch_reserve_courses.php	7429	0644	edit dl rm
fetch_retake_courses.php	923	0644	edit dl rm
fetch_scheduled_courses.php	2178	0644	edit dl rm
fetch_schedule_report_by_group.php	5440	0644	edit dl rm
fetch_teachers_by_group.php	4421	0644	edit dl rm
fetch_teachers_by_program.php	1821	0644	edit dl rm
fetch_teachers_for_group.php	3170	0644	edit dl rm
fetch_teacher_assignment.php	24776	0644	edit dl rm
fetch_teacher_by_course.php	3880	0644	edit dl rm
fetch_teacher_conflicts.php	5682	0644	edit dl rm
fetch_teacher_conflicts_only.php	7665	0644	edit dl rm
fetch_teacher_conflicts_only_force_conflicts.php	7114	0644	edit dl rm
fetch_teacher_conflicts_showonly.php	10447	0644	edit dl rm
fetch_teacher_load.php	1482	0644	edit dl rm
fetch_teacher_prefrence_courses_accounting.php	1606	0644	edit dl rm
find_replacement-1.php	16075	0644	edit dl rm
find_replacement.php	18161	0644	edit dl rm
followup.php	16160	0644	edit dl rm
Generate Group Schedule.php	16987	0644	edit dl rm
Generate Group Schedule 1.php	18121	0644	edit dl rm
generateschedule.php	15706	0644	edit dl rm
Generate_Schedule.php	33620	0644	edit dl rm
generate_schedule_handler.php	7095	0644	edit dl rm
Generate_Schedule_Script.php	29731	0644	edit dl rm
getlang.php	326	0644	edit dl rm
getrefer.php	4349	0644	edit dl rm
getstatus.php	1260	0644	edit dl rm
get_groups_by_program.php	608	0644	edit dl rm
get_schedule_ai-1.php	37755	0644	edit dl rm
get_schedule_ai - Copy.php	36459	0644	edit dl rm
get_schedule_ai.php	36855	0644	edit dl rm
get_schedule_report.php	2393	0644	edit dl rm
group_schedule_form - Copy.php	16994	0644	edit dl rm
group_schedule_form.php	16994	0644	edit dl rm
main-header-inc.php	1196	0644	edit dl rm
main-header.php	16671	0644	edit dl rm
managecategory.php	9233	0644	edit dl rm
managerreports.php	25056	0644	edit dl rm
Preference_Accounting.php	22503	0644	edit dl rm
profile.php	20680	0644	edit dl rm
reference_list.php	8207	0644	edit dl rm
remove_saturday_course.php	19503	0644	edit dl rm
report_absence.php	19287	0644	edit dl rm
report_absence_1.php	6160	0644	edit dl rm
reserve_course.php	18957	0644	edit dl rm
rewrite_ajax_replace_saturday.php	12800	0644	edit dl rm
rewrite_Create_Schedule_Algorithm.php	88318	0644	edit dl rm
rewrite_Create_Schedule_Algorithm_2.php	88900	0644	edit dl rm
save_schedule.php	2970	0644	edit dl rm
save_schedule_group_course.php	25367	0644	edit dl rm
schedulereportbygroup.php	17731	0644	edit dl rm
schedulereportbyteacher.php	19111	0644	edit dl rm
scheduleteacherbygroupreport - Copy.php	31986	0644	edit dl rm
scheduleteacherbygroupreport.php	36556	0644	edit dl rm
scheduleteacherreport.php	28150	0644	edit dl rm
schedule_report.php	17664	0644	edit dl rm
Schedule_Report_by_Group.php	3647	0644	edit dl rm
Schedule_Report_by_Teacher.php	92433	0644	edit dl rm
selectuser.php	1172	0644	edit dl rm
swapcourses.php	19469	0644	edit dl rm
teacher_preference.php	18182	0644	edit dl rm
teacher_preference_by_course.php	19244	0644	edit dl rm
teacher_unavailability.php	17835	0644	edit dl rm
test.php	13895	0644	edit dl rm
test1.php	21837	0644	edit dl rm
transfer_reference.php	27288	0644	edit dl rm
unassigncoursereport.php	16029	0644	edit dl rm
unassign_course.php	19011	0644	edit dl rm
Unassign_Course_Report.php	1697	0644	edit dl rm
unscheduledgroupreport.php	15675	0644	edit dl rm
Unscheduled_Group_Report.php	2007	0644	edit dl rm
updateclient.php	14765	0644	edit dl rm
updatecourse.php	21626	0644	edit dl rm
updatecoursesessionhours.php	18197	0644	edit dl rm
updatecoursetime.php	21831	0644	edit dl rm
updategroup - Copy.php	24534	0644	edit dl rm
updategroup.php	18001	0644	edit dl rm
updateholiday.php	22493	0644	edit dl rm
updateteacherlevel.php	24532	0644	edit dl rm
updateteacherunavailability.php	14184	0644	edit dl rm
UpdateUser.php	18214	0644	edit dl rm
Update_Course_Hours.php	2135	0644	edit dl rm
Update_Follow_Up.php	4618	0644	edit dl rm
update_reserve_course.php	1934	0644	edit dl rm
update_teacher_level	2508	0644	edit dl rm
update_teacher_level.php	2430	0644	edit dl rm
useraccesslist.php	12875	0644	edit dl rm
users.php	9049	0644	edit dl rm
view_swap_log.php	894	0644	edit dl rm

Edit: /home/techb158/workloadmatch.com/workloadmatch.com/Manager/Create_Schedule_Algorithm_2_combined.php (89764B)

<?php
include_once '../includes/db_connect.php';
include_once '../includes/functions.php';
//include_once 'ajax_replace_saturday.php';

//include_once 'Create_Group_Schedule_Algorithm.php';
sec_session_start();
require '../includes/CSRF_Protect.php';
$csrf = new CSRF_Protect();

$page = 'Manager | Generate Group Schedule';
addinfo($page, $mysqli);

// =========================================
// 2. Fetch Available Programs (Dropdown)
// =========================================
$stmtGroup = $mysqli->prepare("SELECT Program_ID, Program_Name FROM Programs");
$stmtGroup->execute();
$programData = $stmtGroup->get_result()->fetch_all(MYSQLI_ASSOC);
$stmtGroup->close();

// =========================================
// 3. Define Utility Functions (Important Modularization)
// =========================================

// --------------- Helper functions (these should be at the end of the file) ---------------

/**
 * Find the best course to "push" for a blocked slot (retake), using the same logic as normal slot selection.
 */
function getCourseToPush(
    $specialCourseOnlyMode,
    $specialCourseID,
    $selectedCourses,
    $remainingSessions,
    $slotIndex,
    $lockedSlot,
    $courseSlotMap,
    $activeCourses,
    $usedToday,
    $courseCodes
) {
    if ($specialCourseOnlyMode) return $specialCourseID;

$candidates = array_filter($selectedCourses, function($cid) use (
        $remainingSessions, $slotIndex, $lockedSlot, $courseSlotMap
    ) {
        if (($remainingSessions[$cid] ?? 0) <= 0) return false;
        if (isset($lockedSlot[$cid]) && $lockedSlot[$cid] !== $slotIndex) return false;
        if (isset($courseSlotMap[$cid]) && $courseSlotMap[$cid] !== $slotIndex) return false;
        return true;
    });
	//##################################################################
    $onlyCourseIDLeft = (count($activeCourses) === 1) ? array_key_first($activeCourses) : null;
    return getNextCourseForSlot(
        $remainingSessions,
        $candidates,
        $usedToday,
        $courseCodes,
        $onlyCourseIDLeft
    );
	//##################################################################
	/* $onlyCourseIDLeft = (count($activeCourses) === 1)
    ? array_key_first($activeCourses)
    : null;

$courseID = getNextCourseForSlot(
    $remainingSessions,
    array_keys($activeCourses),
    $usedToday,
    $courseCodes,
    $onlyCourseIDLeft
); */

}

/**
 * Find the next course to assign to a slot (normal scheduling).
 */
function selectNextCourse(
    $specialCourseOnlyMode,
    $specialCourseID,
    $selectedCourses,
    $remainingSessions,
    $slotIndex,
    $lockedSlot,
    $courseSlotMap,
    $activeCourses,
    $usedToday,
    $courseCodes
) {
    if ($specialCourseOnlyMode) return $specialCourseID;

$candidates = array_filter($selectedCourses, function($cid) use (
        $remainingSessions, $slotIndex, $lockedSlot, $courseSlotMap
    ) {
        if (($remainingSessions[$cid] ?? 0) <= 0) return false;
        if (isset($lockedSlot[$cid]) && $lockedSlot[$cid] !== $slotIndex) return false;
        if (isset($courseSlotMap[$cid]) && $courseSlotMap[$cid] !== $slotIndex) return false;
        return true;
    });
    $onlyCourseIDLeft = (count($activeCourses) === 1) ? array_key_first($activeCourses) : null;
    return getNextCourseForSlot(
        $remainingSessions,
        $candidates,
        $usedToday,
        $courseCodes,
        $onlyCourseIDLeft
    );
}

/**
 * Locks a course to a slot if there are only 2 courses left and they're running in parallel.
 */
function applySlotLocking(
    $activeCourses,
    $remainingSessions,
    $specialCourseID,
    &$lockedSlot,
    $slotIndex
) {
    if (count($activeCourses) === 2) {
        foreach ($remainingSessions as $cid => $cnt) {
            if ($cnt > 0 && $cid !== $specialCourseID && !isset($lockedSlot[$cid])) {
                $lockedSlot[$cid] = $slotIndex;
            }
        }
    }
}

// =========================================
// 4. Handle POST Request to Generate Schedule
// =========================================
// Format the label of the time slot, especially for Saturday sessions
function format_time_slot_label($slot, $day) {
    if ($day === 'Saturday') {
        if (stripos($slot, 'evening') !== false) return 'Morning (Sat)';
        if (stripos($slot, 'morning') !== false) return 'Morning';
    }
    return $slot;
}

// Format the time range of the session based on the slot and the day
function format_time_slot_range($slot, $start, $end, $day) {
    if ($day === 'Saturday') {
        if (stripos($slot, 'morning') !== false) return "08:30 AM - 12:30 PM";
        if (stripos($slot, 'evening') !== false) return "09:00 AM - 01:00 PM";
    }
    return date('h:i A', strtotime($start)) . ' - ' . date('h:i A', strtotime($end));
}

// Get group configuration from database
function get_group_info($mysqli, $Group_ID) {
    $stmt = $mysqli->prepare("SELECT Time_Slot, Time_From, Time_To, class_days, Weekend_Class, Group_Name FROM Manager_Group_Name WHERE Group_ID = ?");
    $stmt->bind_param("i", $Group_ID);
    $stmt->execute();
    return $stmt->get_result()->fetch_assoc();
}

// Retrieve time slots for the group
function fetch_slot_times($mysqli, $slotLabels, $managerStart, $managerEnd) {
    $timeFrom = [];
    $timeTo = [];
    foreach ($slotLabels as $label) {
        $label = trim($label);
        $stmt = $mysqli->prepare("SELECT Time_From, Time_To FROM Time_Slot_Programs WHERE Time_Slot = ?");
        $stmt->bind_param("s", $label);
        $stmt->execute();
        $result = $stmt->get_result();
        $validSlotFound = false;
        while ($row = $result->fetch_assoc()) {
            $slotStart = new DateTime($row['Time_From']);
            $slotEnd = new DateTime($row['Time_To']);
            if ($slotStart >= $managerStart && $slotEnd <= $managerEnd) {
                $timeFrom[] = $slotStart->format("H:i:s");
                $timeTo[] = $slotEnd->format("H:i:s");
                $validSlotFound = true;
                break;
            }
        }
        if (!$validSlotFound && count($slotLabels) === 1) {
            $timeFrom[] = $managerStart->format("H:i:s");
            $timeTo[] = $managerEnd->format("H:i:s");
        }
    }
    return [$timeFrom, $timeTo];
}

// Collect all holiday dates in the current year
/*
function get_holidays($mysqli, $Start_Date) {
    $holidays = [];
    $res = $mysqli->query("SELECT Event_Title, Event_Start, Event_End FROM Events WHERE Calendar_Year = YEAR('$Start_Date')");
    while ($row = $res->fetch_assoc()) {
        $start = new DateTime($row['Event_Start']);
        $end = new DateTime($row['Event_End']);
        while ($start <= $end) {
            $dateStr = $start->format('Y-m-d');
            $holidays[$dateStr] = $row['Event_Title']; // 👈 include the title
            $start->modify('+1 day');
        }
    }
    return $holidays;
}
*/
// Collect all holiday dates in the current year
function get_holidays($mysqli, $Start_Date, $End_Date = null) {
    $holidays = [];

// If no end date is provided, default to one year after the start date
    if ($End_Date === null) {
        $End_Date = date('Y-m-d', strtotime('+1 year', strtotime($Start_Date)));
    }

$stmt = $mysqli->prepare("
        SELECT Event_Title, Event_Start, Event_End
        FROM Events
        WHERE Event_Start <= ? 
          AND Event_End   >= ?
    ");
    // All holidays that overlap the scheduling window [Start_Date, End_Date]
    $stmt->bind_param('ss', $End_Date, $Start_Date);
    $stmt->execute();
    $res = $stmt->get_result();

while ($row = $res->fetch_assoc()) {
        $start = new DateTime($row['Event_Start']);
        $end   = new DateTime($row['Event_End']);

while ($start <= $end) {
            $dateStr = $start->format('Y-m-d');
            $holidays[$dateStr] = $row['Event_Title'];
            $start->modify('+1 day');
        }
    }

return $holidays;
}

// Collect all retake dates for the group and program
/*function get_retake_dates($mysqli, $Program_ID, $Group_ID) {
    $retakeDates = [];
    $stmt = $mysqli->prepare("SELECT Type, Retake_Date FROM Retake_Records WHERE Program_ID = ? AND Group_ID = ?");
    $stmt->bind_param("ii", $Program_ID, $Group_ID);
    $stmt->execute();
    $res = $stmt->get_result();
    while ($row = $res->fetch_assoc()) {
        $retakeDates[$row['Retake_Date']] = $row['Type'];  // e.g., ['2025-09-10' => 'Midterm']
    }
    return $retakeDates;
}*/

// In get_retake_dates() - ensure consistent structure
function get_retake_dates($mysqli, $Program_ID, $Group_ID) {
    $retakeDates = [];
    //$sql = "SELECT Group_Slot_ID, Time_Slot_Programs_ID, Time_Slot, Time_From, Time_To FROM Group_Slot_Mapping WHERE Group_ID = ?";
    
	$sql = "
        SELECT 
            rr.Time_Slot_Programs_ID,
            rr.Retake_Date,
            rr.Type,
            gsm.Group_Slot_ID,
            gsm.Time_Slot_Programs_ID,
            gsm.Time_Slot,
            gsm.Time_From,
            gsm.Time_To
        FROM Retake_Records AS rr
        INNER JOIN Group_Slot_Mapping AS gsm 
            ON rr.Time_Slot_Programs_ID = gsm.Time_Slot_Programs_ID
           AND rr.Group_ID = gsm.Group_ID
        WHERE rr.Program_ID = ?
          AND rr.Group_ID   = ?
    ";
	
	$stmt = $mysqli->prepare($sql);
    $stmt->bind_param("ii", $Program_ID, $Group_ID);
    $stmt->execute();
    $res = $stmt->get_result();
	//echo "<pre>Retake SQL result rows: " . $res->num_rows . "</pre>";
    while ($row = $res->fetch_assoc()) {
        $retakeDates[$row['Retake_Date']][$row['Group_Slot_ID']] = [
			'label' => $row['Time_Slot'],
			'from'  => $row['Time_From'],
			'to'    => $row['Time_To'],
			'type'  => $row['Type']
		];

}
    return $retakeDates;
}

function get_retake_dates_info($mysqli, $Program_ID, $Group_ID) {
   $retakeDates = [];
    $stmt = $mysqli->prepare("
        SELECT Retake_Date, Type, Time_Slot_Programs_ID 
        FROM Retake_Records 
        WHERE Program_ID = ? AND Group_ID = ?
    ");
    $stmt->bind_param("ii", $Program_ID, $Group_ID);
    $stmt->execute();
    $res = $stmt->get_result();
    while ($row = $res->fetch_assoc()) {
        // Store as [date][slotID] = type
        $retakeDates[$row['Retake_Date']][$row['Time_Slot_Programs_ID']] = $row['Type'];
    }
    return $retakeDates;
 /*
$retakeDates = [];

$sql = "
        SELECT 
            rr.Retake_Date,
            rr.Type,
            gsm.Group_Slot_ID
        FROM Retake_Records AS rr
        INNER JOIN Group_Slot_Mapping AS gsm 
            ON rr.Time_Slot_Programs_ID = gsm.Time_Slot_Programs_ID
           AND rr.Group_ID = gsm.Group_ID
        WHERE rr.Program_ID = ?
          AND rr.Group_ID   = ?
    ";
    $stmt = $mysqli->prepare($sql);
    $stmt->bind_param("ii", $Program_ID, $Group_ID);
    $stmt->execute();
    $res = $stmt->get_result();

while ($row = $res->fetch_assoc()) {
        // now keyed by [date][slotIndex]
        $date     = $row['Retake_Date'];
        $slotIdx  = intval($row['Group_Slot_ID']) - 1; // zero-based
		$retakeDates[$row['Retake_Date']][$row['Group_Slot_ID']] = $row['Type'];
        //$retakeDates[$date][$slotIdx] = $row['Type'];
    }

return $retakeDates;*/
}

// Calculate the average duration of one session
function calculate_session_length($timeFrom, $timeTo) {
    $sessionLength = 0;
    foreach ($timeFrom as $i => $from) {
        $fromTime = new DateTime($from);
        $toTime = new DateTime($timeTo[$i]);
        $sessionLength += ($toTime->getTimestamp() - $fromTime->getTimestamp()) / 3600;
    }
    $slotCount = count($timeFrom);
    return $slotCount > 0 ? $sessionLength / $slotCount : 3;
}

// Calculate the number of sessions required for each course
function calculate_course_sessions($mysqli, $Program_ID, $sessionLength) {
    $courseSessions = [];
    $res = $mysqli->query("SELECT Course_ID, Course_Time FROM Courses WHERE Program_ID = $Program_ID");
    while ($row = $res->fetch_assoc()) {
        $courseID = $row['Course_ID'];
        $courseHours = $row['Course_Time'];
        $courseSessions[$courseID] = ceil($courseHours / $sessionLength);
    }
    return $courseSessions;
}

// Generate all valid class dates, excluding holidays, retakes, and July
function generate_valid_dates($Start_Date, $End_Date, $classDays, $holidayDates, $retakeDates) {
    $validDates = [];
    $cur = new DateTime($Start_Date);
    $end = $End_Date ? new DateTime($End_Date) : null;
    while (!$end || $cur <= $end) {
        $day = $cur->format('l');
        $dateStr = $cur->format('Y-m-d');
        $month = (int) $cur->format('m');
//        if ($month === 7 || !in_array($day, $classDays) || array_key_exists($dateStr, $holidayDates) || array_key_exists($dateStr, $retakeDates)) {
//    $cur->modify('+1 day');
//    continue;
//}

if ($month === 7
  || !in_array($day, $classDays)
  || array_key_exists($dateStr, $holidayDates)) {
    $cur->modify('+1 day');
    continue;
}

$validDates[] = $dateStr;
        $cur->modify('+1 day');
        if ($end === null && count($validDates) > 365) break; // Prevent infinite loop in fallback
    }
    return $validDates;
}

// Build calendar excluding holidays, retakes, and July
function build_schedule_calendar($Start_Date, $End_Date, $classDays, $timeSlots, $mysqli, $Program_ID, $Group_ID) {
    $start = new DateTime($Start_Date);
    $end = $End_Date ? new DateTime($End_Date) : new DateTime('+1 year');
    $calendar = [];

$holidayDates = get_holidays($mysqli, $Start_Date);
    $retakeDates = get_retake_dates($mysqli, $Program_ID, $Group_ID);

$cur = clone $start;
    while ($cur <= $end) {
        $day = $cur->format('l');
        $dateStr = $cur->format('Y-m-d');
        $month = (int) $cur->format('m');

if ($month !== 7 && in_array($day, $classDays) && !in_array($dateStr, $holidayDates) && !in_array($dateStr, $retakeDates)) {
            foreach ($timeSlots as $slot) {
                $calendar[$dateStr][trim($slot)] = 'free';
            }
        }
        $cur->modify('+1 day');
    }

return $calendar;
}

// ✅ You can now call these functions in your main POST logic to keep code readable and modular.

// Helper function for fair rotation
/*function getNextCourseForSlot($remainingSessions, $courseList, $usedToday) {
    $available = array_filter($courseList, function($courseID) use ($remainingSessions) {
        return ($remainingSessions[$courseID] ?? 0) > 0;
    });

$unusedToday = array_filter($available, fn($courseID) => !in_array($courseID, $usedToday));

if (!empty($unusedToday)) {
        return reset($unusedToday);
    }

// Allow same course in both slots if only one remains
    if (count($available) === 1) {
        return reset($available);
    }

return null;
}*/

/**
 * Returns the next best course ID to schedule for a given slot, given remaining sessions, priorities, and special cases.
 * 
 * @param array $remainingSessions courseID => number left
 * @param array $candidates list of course IDs eligible for this slot
 * @param array $usedToday list of course IDs already scheduled *today* (to avoid doubling same course per day)
 * @param array $courseCodes map: courseID => course code
 * @param int|null $onlyCourseIDLeft if only one course remains, its ID
 * @return int|null the selected course ID or null if none eligible
 */
function getNextCourseForSlot($remainingSessions, $candidates, $usedToday, $courseCodes = [], $onlyCourseIDLeft = null) {
    // 1. Filter to courses that have sessions left
    $available = array_filter($candidates, function($cid) use ($remainingSessions) {
        return ($remainingSessions[$cid] ?? 0) > 0;
    });

// 2. Prefer a course not already used today
    foreach ($available as $cid) {
        if (!in_array($cid, $usedToday)) {
            return $cid;
        }
    }

// 3. If only one course left (last), allow re-use
    if (count($available) === 1 && ($onlyCourseIDLeft === reset($available))) {
        return reset($available);
    }

// 4. Special: If two courses left and one is a "special" course code, prefer it
    if (count($available) === 2 && !empty($courseCodes)) {
        foreach ($available as $cid) {
            $code = $courseCodes[$cid] ?? '';
            if (in_array($code, ['961-238', '960-746'])) {
                return $cid;
            }
        }
    }

// 5. If all else fails, just return the first available
    return reset($available) ?: null;
}

$scheduleOutput = []; // Default
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
	//if (isset($_POST['reset']) || isset($_POST['Start_Date'])) {
     //   unset($_SESSION['deletedSaturdays']);
    //}
    // Step 1: Retrieve Form Data
	
$forceSecondSpecialAfternoon = !empty($_POST['force_second_special_afternoon']);
$lastCourseBothSlots        = !empty($_POST['last_course_both_slots']);

$Program_ID = intval($_POST['Program_ID']);
    $Group_ID = intval($_POST['Group_ID']);
    $Start_Date = $_POST['Start_Date'];
    $End_Date = $_POST['End_Date'] ?? date('Y-m-d', strtotime('+1 year', strtotime($Start_Date)));
    $selectedCourses = $_POST['Selected_Courses'] ?? [];
    $courseSessions = $_POST['Course_Sessions'] ?? [];
    $priorityCourses = $_POST['Priority_Course'] ?? [];
    $courseSlotInput = $_POST['Course_Slot'] ?? [];
	
	$group = get_group_info($mysqli, $Group_ID);
    if (!$group) {
        echo "Group info not found.";
        exit;
    }

$classDays = explode(',', $group['class_days']);
    if (!$group['Weekend_Class'] && in_array('Saturday', $classDays)) {
        $classDays = array_filter($classDays, fn($day) => $day !== 'Saturday');
    }

$slotLabels = explode(',', $group['Time_Slot']);
    $managerStart = new DateTime(trim($group['Time_From']));
    $managerEnd = new DateTime(trim($group['Time_To']));

//list($timeFrom, $timeTo) = fetch_slot_times($mysqli, $slotLabels, $managerStart, $managerEnd);
// Example (replace with your actual fetch code):
$all_slot_program_ids = [];
$group_slot_labels = [];
$group_time_from = [];
$group_time_to = [];

$stmt = $mysqli->prepare("SELECT Group_Slot_ID,Time_Slot_Programs_ID, Time_Slot, Time_From, Time_To FROM Group_Slot_Mapping WHERE Group_ID = ?");
$stmt->bind_param("i", $Group_ID);
$stmt->execute();
$res = $stmt->get_result();

$slotLabels = $timeFrom = $timeTo = [];
while ($row = $res->fetch_assoc()) {
    $slotLabels[] = $row['Time_Slot'];
    $timeFrom[]   = $row['Time_From'];
    $timeTo[]     = $row['Time_To'];
    $group_slot_id[]     = $row['Group_Slot_ID'];
	
	$slotProgramID = $row['Time_Slot_Programs_ID'];
    $all_slot_program_ids[] = $slotProgramID;
    $group_slot_labels[$slotProgramID] = $row['Time_Slot'];
    $group_time_from[$slotProgramID] = $row['Time_From'];
    $group_time_to[$slotProgramID] = $row['Time_To'];

}
	
	$sessionLength = calculate_session_length($timeFrom, $timeTo);
    $courseSessions = calculate_course_sessions($mysqli, $Program_ID, $sessionLength);

$holidayDates = get_holidays($mysqli, $Start_Date);
    $retakeDates = get_retake_dates($mysqli, $Program_ID, $Group_ID);
    $validDates = generate_valid_dates($Start_Date, $End_Date, $classDays, $holidayDates, $retakeDates);

$suggestedSessions = calculate_course_sessions($mysqli, $Program_ID, $sessionLength);

$courseSessions = [];
foreach ($selectedCourses as $courseID) {
    $custom = $_POST['Course_Sessions'][$courseID] ?? null;
    if (is_numeric($custom) && intval($custom) > 0) {
        $courseSessions[$courseID] = intval($custom);
    } else {
        $courseSessions[$courseID] = $suggestedSessions[$courseID] ?? 0;
    }
}
    //echo "<h3>📅 Valid Dates for Scheduling (Excluding July)</h3><pre>"; print_r($validDates); echo "</pre>";

// 🔄 Additional scheduling logic ....
	
	    // Output valid dates
    //echo "<h3>📅 Valid Dates for Scheduling (Excluding July)</h3><pre>"; print_r($validDates); echo "</pre>";
$totalSessionsNeeded = array_sum($courseSessions);
$availableDays = count($validDates);

// Estimate sessions per day (based on number of slots)
$sessionsPerDay = count($slotLabels);

// Calculate how many days are needed to finish all sessions
$daysRequired = ceil($totalSessionsNeeded / $sessionsPerDay);

// Get expected end date
$expectedEndDate = $validDates[$daysRequired - 1] ?? end($validDates); // fallback to last available if out of bounds

//echo "<h3>📅 Expected End Date Based on Andragogical Days</h3>";
//echo "<p><strong>$expectedEndDate</strong> (" . (new DateTime($expectedEndDate))->format('l') . ")</p>";

// Sort by course priority
    usort($selectedCourses, function ($a, $b) use ($priorityCourses) {
        $priorityA = $priorityCourses[$a] ?? PHP_INT_MAX;
        $priorityB = $priorityCourses[$b] ?? PHP_INT_MAX;
        return $priorityA <=> $priorityB;
    });

// echo "<h3>🔄 Sorted Courses (Priority First)</h3><pre>"; print_r($selectedCourses); echo "</pre>";

// Prepare for fair scheduling (one course per slot)
// Initialize

$schedule = [];
$remainingSessions = [];
foreach ($selectedCourses as $courseID) {
    $remainingSessions[$courseID] = $courseSessions[$courseID] ?? 0;
}

// Queue of all courses
$courseQueue = $selectedCourses;
$currentCourses = [
    0 => null, // Slot 1 (e.g. Morning)
    1 => null  // Slot 2 (e.g. Afternoon)
];

// Assign initial two courses
// Assign initial courses to slots without repeating
$courseQueueCopy = $selectedCourses;
$assignedCourses = [];

foreach ([0, 1] as $slotIndex) {
    foreach ($courseQueueCopy as $courseID) {
        if (!in_array($courseID, $assignedCourses) && $remainingSessions[$courseID] > 0) {
            $currentCourses[$slotIndex] = $courseID;
            $assignedCourses[] = $courseID;
            break;
        }
    }
}

// Fetch all course names into array
    $courseNames = [];
    $courseRes = $mysqli->query("SELECT Course_ID, Course_Name FROM Courses");
    while ($row = $courseRes->fetch_assoc()) {
        $courseNames[$row['Course_ID']] = $row['Course_Name'];
    }

// Fetch all course codes into array (needed by getNextCourseForSlot)
    $courseCodes = [];
    $codeRes = $mysqli->query("SELECT Course_ID, Course_Code FROM Courses");
    while ($r = $codeRes->fetch_assoc()) {
        $courseCodes[$r['Course_ID']] = $r['Course_Code'];
    }
	
	
	
// --- Setup slot/course/retake tracking structures --- 
$courseSlotMap = [];                // Tracks which slot a course is "locked" to (courseID => slotIndex)
$numSlots = count($slotLabels);
if ($numSlots === 2 && !empty($courseSlotInput)) {
    foreach ($selectedCourses as $cid) {
        $cid = (int)$cid;
        if (isset($courseSlotInput[$cid]) && $courseSlotInput[$cid] !== '') {
            $si = (int)$courseSlotInput[$cid];
            if ($si === 0 || $si === 1) {
                $courseSlotMap[$cid] = $si;
            }
        }
    }
}
$specialCourseOnlyMode = false;     // If only 1 "special" course is left, triggers special scheduling logic
$specialCourseID = null;            // Holds the ID of the "special" course (e.g. 961-238, 960-746)
$lockedSlot = [];                   // Tracks if a course is locked to a slot (courseID => slotIndex)
$pushedCourse = [];                 // If a course is "pushed" (blocked by a retake), store it for later in this slot (slotIndex => courseID)

$numSlots = count($slotLabels);      // Number of time slots per day

/////######################################

/**
 * Pre-schedules every special course into $schedule,
 * tagging their last session as an exam.
 *
 * @param array  &$schedule            The schedule array to append into
 * @param array   $specialCourseIDs    Ordered list of special course IDs
 * @param array  &$remainingSessions   Course_ID => sessions remaining
 * @param array   $allSlots            Flat list of slot metadata
 * @param array   $courseNames         Course_ID => human name
 */
/**
 * Pre-schedules every special course into $schedule,
 * tagging their last session as an exam.  Returns the last date/slot used.
 *
 * @return array [$lastDate, $lastSlotIndex]
 */
/**
 * Pre-schedules every special course into $schedule,
 * tagging their last session as an exam and forcing
 * the final session of the 2nd & 4th specials into an afternoon slot.
 *
 * @return array  [$lastDate, $lastSlotIndex]
 */
function scheduleSpecialCourses(
    array &$schedule,
    array $specialCourseIDs,
    array &$remainingSessions,
    array $allSlots,
    array $courseNames,
	bool  $forceSecondSpecialAfternoon   // ← here signature to accept the new flag
): array {
    $spPtr = 0;
    $lastSpecialDate = null;
    $lastSpecialSlot = null;

foreach ($specialCourseIDs as $idx => $spCid) {
        $toDo = $remainingSessions[$spCid] ?? 0;
        while ($toDo > 0 && isset($allSlots[$spPtr])) {
            $slot = $allSlots[$spPtr];

/* // Always force the last session (exam) into the Afternoon slot (slotIndex == 1)
            if ($toDo === 1 && $slot['slotIndex'] === 0) {
                // Search forward for afternoon slot on same day
                for ($j = $spPtr; $j < count($allSlots); $j++) {
                    if (
                        $allSlots[$j]['date'] === $slot['date'] &&
                        $allSlots[$j]['slotIndex'] === 1
                    ) {
                        $slot = $allSlots[$j];
                        $spPtr = $j;
                        break;
                    }
                }
            } */
			    // If user asked to force the *second* special into afternoon…
    if (
      $forceSecondSpecialAfternoon
      && $toDo === 1            // last session
      && $slot['slotIndex'] === 0
    ) {
        // scan forward to same-day slotIndex=1
        for ($j = $spPtr; $j < count($allSlots); $j++) {
            if (
              $allSlots[$j]['date']      === $slot['date']
              && $allSlots[$j]['slotIndex'] === 1
            ) {
                $slot = $allSlots[$j];
                $spPtr = $j + 1;
                break;
            }
        }
    }

$spPtr++;
            if (!$slot['from'] || !$slot['to']) continue;

$isExam = ($toDo === 1);

$schedule[] = [
                'Date'           => $slot['date'],
                'SlotIndex'      => $slot['slotIndex'],
                'Slot'           => $slot['slotLabel'],
                'Time'           => format_time_slot_range(
                                        $slot['slotLabel'],
                                        $slot['from'],
                                        $slot['to'],
                                        $slot['dayName']
                                    ),
                'Course_ID'      => $spCid,
                'Course_Name'    => $courseNames[$spCid] ?? '',
                'Start_Time'     => $slot['from'],
                'End_Time'       => $slot['to'],
                'Group_Slot_ID'  => $slot['groupSlotId'],
                'Reserve_Course' => 0,
                'IsExam'         => $isExam,
            ];
            $lastSpecialDate = $slot['date'];
            $lastSpecialSlot = $slot['slotIndex'];
            $toDo--;
            $remainingSessions[$spCid]--;
        }
        unset($remainingSessions[$spCid]);
    }
    return [$lastSpecialDate, $lastSpecialSlot];
}

// --- SPECIAL COURSES SCHEDULING --- (only when there are 2+ slots per day) ---
// ------------------------------------------------------------------------
$occupiedSlots = [];
$pushQueue = [];
$lastSpecialDate = null;
$lastSpecialSlot = null;

if ($numSlots > 1) {
// ➊ Prepare your schedule array and remainingSessions as you already do…
// $remainingSessions is already set from your courseSessions logic
// ➀ Build $specialCourseIDs from your Courses table & specialCourseCodes
$specialCourseCodes = ['CST53001','961-012','SEC-CST53001','960-501'];
$specialCourseIDs = [];
$cRes = $mysqli->query("
    SELECT Course_ID, Course_Code
    FROM Courses
");
while ($r = $cRes->fetch_assoc()) {
    if (in_array($r['Course_Code'], $specialCourseCodes)) {
        $specialCourseIDs[] = $r['Course_ID'];
    }

// Keep only special courses that are actually selected and still have sessions
$specialCourseIDs = array_values(array_filter($specialCourseIDs, function($cid) use ($remainingSessions) {
    return isset($remainingSessions[$cid]) && ($remainingSessions[$cid] ?? 0) > 0;
}));
}

// Global queue for any course bumped by a retake
$pushQueue = [];

//##############################################################
//##############################################################
// ➁ Build $allSlots from $validDates and your slot/time data
$allSlots = [];
foreach ($validDates as $date) {
    foreach (array_keys($slotLabels) as $si) {
        $gid = $group_slot_id[$si] ?? 0;
        if (!empty($retakeDates[$date][$gid]) || !empty($holidayDates[$date])) {
            continue;
        }
        $allSlots[] = [
            'date'       => $date,
            'slotIndex'  => $si,
            'slotLabel'  => $slotLabels[$si],
            'from'       => $timeFrom[$si] ?? null,
            'to'         => $timeTo[$si]   ?? null,
            'groupSlotId'=> $gid,
            'dayName'    => (new DateTime($date))->format('l'),
        ];
    }
}

// ➋ Front-load specials via the new function
// front-load all specials, capturing where they ended
list($lastSpecialDate, $lastSpecialSlot) = scheduleSpecialCourses(
    $schedule,
    $specialCourseIDs,
    $remainingSessions,
    $allSlots,
    $courseNames,	// ← pass this in now
	$forceSecondSpecialAfternoon   // ← here pass your flag
);

// Mark already-used date/slot pairs
    $occupiedSlots = [];
    foreach ($schedule as $s) {
        if (isset($s['Date'], $s['SlotIndex'])) {
            $occupiedSlots[$s['Date']][$s['SlotIndex']] = true;
        }
    }
} else {
    // Single-slot groups do not use special front-loading or occupied slot tracking
    $occupiedSlots = [];
    $pushQueue = [];
    $lastSpecialDate = null;
    $lastSpecialSlot = null;
}

// --- Main scheduling loop over each valid date ---
foreach ($validDates as $date) {
    $usedToday = [];                                   // Reset courses used for this day
    $dayName = (new DateTime($date))->format('l');     // Get the day of week, e.g. "Monday"
    $activeCourses = array_filter($remainingSessions, fn($s) => $s > 0); // Only courses that still need sessions
    $activeCourseIDs = array_keys($activeCourses);     // Their IDs

// --- Detect special course only mode (e.g. last course is a "special" one) ---
    $specialCourseOnlyMode = false;
    $specialCourseID = null;
     if (count($activeCourseIDs) === 1) {
        $cid = $activeCourseIDs[0];
        $code = $courseCodes[$cid] ?? '';
			/* if (count($activeCourseIDs) === 1 && !$__special_sessions_adjusted) {
			$cid = $activeCourseIDs[0];
			$code = $courseCodes[$cid] ?? '';
			if (in_array($code, $specialCourseCodes) && $numSlots > 1) {
				//$remainingSessions[$cid] = ceil($remainingSessions[$cid] / $numSlots);
				//$__special_sessions_adjusted = true;
			}
			}*/
			
        if (in_array($code, ['961-238', '960-746'])) {
		//if (in_array($code, ['', ''])) {
            $specialCourseOnlyMode = true;
            $specialCourseID = $cid;
			// 🟡 ADJUST THE SESSION COUNT if we allow special course in both slots
        // Only adjust ONCE!
            if ($numSlots > 1 && !$__special_sessions_adjusted) {
                $remainingSessions[$specialCourseID] = ceil($remainingSessions[$specialCourseID] / $numSlots);
                $__special_sessions_adjusted = true;
            }
        } 
    }

// ========== SINGLE SLOT LOGIC ==========
    if ($numSlots === 1) {
        $slotIndex = 0;
        $from = $timeFrom[$slotIndex] ?? null;
        $to   = $timeTo[$slotIndex] ?? null;
        $slotLabel = $slotLabels[$slotIndex];
		$groupSlot = $group_slot_id[$slotIndex] ?? 0;
        // If there's a retake for this date (regardless of slot), show retake only
        //if (isset($retakeDates[$date])) {
            // For old format where $retakeDates[$date] is string or array
            //$retakeType = is_array($retakeDates[$date]) ? reset($retakeDates[$date]) : $retakeDates[$date];
        // Look for any slot on this date
$slotIndex = 0;
$groupSlotId = $group_slot_id[$slotIndex]; // should be 32

if (isset($retakeDates[$date][$groupSlotId])) {
    $retake = $retakeDates[$date][$groupSlotId];
    $schedule[] = [
        'Date'         => $date,
         'Slot'           => $retake['label'] ?? $slotLabels[0], // <-- Use label from retakeDates if present, else default
        'Time'         => format_time_slot_range($retake['label'], $retake['from'], $retake['to'], $dayName),
        'Course_ID'    => null,
        'Course_Name'  => "Retake: " . htmlspecialchars($retake['type']),
        'Start_Time'   => $retake['from'],
        'End_Time'     => $retake['to'],
        'Group_Slot_ID'=> $groupSlotId,
        'Reserve_Course' => 0,
        'IsRetake'     => true,
        'Retake_Type'  => $retake['type']
    ];
    continue;
}

// If a pushed (previously blocked) course exists, assign it now
        if (isset($pushedCourse[$slotIndex])) {
            $courseID = $pushedCourse[$slotIndex];
            unset($pushedCourse[$slotIndex]);
        } else {
            // Otherwise, pick next available course normally
            if ($specialCourseOnlyMode) {
                $courseID = $specialCourseID;
            } else {
                $candidates = array_filter($selectedCourses, function($cid) use ($remainingSessions) {
                    return ($remainingSessions[$cid] ?? 0) > 0;
                });
                $onlyCourseIDLeft = (count($activeCourses) === 1) ? array_key_first($activeCourses) : null;
                $courseID = getNextCourseForSlot(
                    $remainingSessions,
                    $candidates,
                    $usedToday,
                    $courseCodes,
                    $onlyCourseIDLeft
                );
            }
            if (!$courseID || ($remainingSessions[$courseID] ?? 0) <= 0) continue;
            $usedToday[] = $courseID;
        }

$courseName = $courseNames[$courseID] ?? "Course #$courseID";
        $schedule[] = [
            'Date'           => $date,
            'Slot'           => "Slot 1",
            'Time'           => format_time_slot_range($slotLabel, $from, $to, $dayName),
            'Course_ID'      => $courseID,
            'Course_Name'    => $courseName,
            'Start_Time'     => $from,
            'End_Time'       => $to,
            'Group_Slot_ID'  => $group_slot_id[$slotIndex] ?? 0,
            'Reserve_Course' => 0
        ];
        $remainingSessions[$courseID]--;
        if (array_sum($remainingSessions) <= 0) break;
    }
    // ========== MULTI-SLOT LOGIC (2 or more slots) ==========
else {

////##########################--- END SPECIAL SCHEDULING ---#################################
    // Loop through each slot (e.g. morning/afternoon)
    foreach (array_keys($slotLabels) as $slotIndex) {
		 // ────────────────────────────────────────────────────────────────────────────
// Only skip slots strictly before the exam date, or the morning of the exam date
 // skip everything up through that exam‐morning
 // Don't double-book: skip if already occupied by a special course
if (!empty($occupiedSlots[$date][$slotIndex])) {
    continue;
}
		 // ─────────────────────────────────────────
        // If we're down to one course, skip the morning slot…
        /* $onlyCourseLeft = (count($activeCourses) === 1);
        if ($onlyCourseLeft && $slotIndex === 0) {
            continue;
        } */
		// Determine if we’re down to exactly one active course
    $onlyCourseLeft = count($activeCourses) === 1;

// Only skip the morning slot *if* they did NOT check “both slots”
    if (
      !$lastCourseBothSlots
      && $onlyCourseLeft
      && $slotIndex === 0
    ) {
        continue;
    }
        // ─────────────────────────────────────────			
            // Now do your normal multi-slot scheduling for regular courses!
			
			
        $from = $timeFrom[$slotIndex] ?? null;
        $to = $timeTo[$slotIndex] ?? null;
        $slotLabel = $slotLabels[$slotIndex];
        $groupSlotId = $group_slot_id[$slotIndex] ?? 0;

if (!$from || !$to) continue;

// --- Special course only mode: skip non-morning slots
		//if ($specialCourseOnlyMode && $slotIndex !== 0) continue;
		// --- 1. RETAKE HANDLING ---
        if (!empty($retakeDates[$date][$groupSlotId])) {
            $slotInfo   = $retakeDates[$date][$groupSlotId];
            $retakeType = $slotInfo['type']  ?? '';
            $slotLabel  = $slotInfo['label'] ?? $slotLabel;
            $from       = $slotInfo['from']  ?? $from;
            $to         = $slotInfo['to']    ?? $to;

$schedule[] = [
                'Date'           => $date,
				'SlotIndex'   => $slotIndex,                   // ← NEW
                'Slot'           => $slotLabel,
				//'Slot'           => "Slot " . ($slotIndex + 1),
                'Time'           => format_time_slot_range($slotLabel, $from, $to, $dayName),
                'Course_ID'      => null,
                'Course_Name'    => "Retake: " . htmlspecialchars($retakeType),
                'Start_Time'     => $from,
                'End_Time'       => $to,
                'Group_Slot_ID'  => $groupSlotId,
                'Reserve_Course' => 0,
                'IsRetake'       => true,
                'Retake_Type'    => $retakeType
            ];

// Optionally push the blocked course for this slot
            if (!isset($pushedCourse[$slotIndex])) {
                $courseToPush = getCourseToPush(
                    $specialCourseOnlyMode,
                    $specialCourseID,
                    $selectedCourses,
                    $remainingSessions,
                    $slotIndex,
                    $lockedSlot,
                    $courseSlotMap,
                    $activeCourses,
                    $usedToday,
                    $courseCodes
                );
                if ($courseToPush !== null) {
                    $pushedCourse[$slotIndex] = $courseToPush;
                }
				if ($courseToPush !== null) {
					$pushQueue[] = $courseToPush;  // enqueue at tail
				}
            }
            continue; // Only skip normal class for this *slot*, not the whole date!
        }

// --- 2. PUSHED COURSE HANDLING (if retake blocked a course previously) ---
        if (isset($pushedCourse[$slotIndex])) {
            $courseID = $pushedCourse[$slotIndex];
            unset($pushedCourse[$slotIndex]);
            // If no remaining sessions for that course, skip
            if (($remainingSessions[$courseID] ?? 0) <= 0) continue;
        } else {
            // --- 3. NORMAL COURSE SCHEDULING ---
            /* $courseID = selectNextCourse(
                $specialCourseOnlyMode,
                $specialCourseID,
                $selectedCourses,
                $remainingSessions,
                $slotIndex,
                $lockedSlot,
                $courseSlotMap,
                $activeCourses,
                $usedToday,
                $courseCodes
            );
            if (!$courseID || ($remainingSessions[$courseID] ?? 0) <= 0) continue;
            $usedToday[] = $courseID; */
			//##################################################################
			// --- 3. NORMAL COURSE SCHEDULING ---
// ————— HERE: ONLY-ONE-COURSE-LEFT SKIP MORNING —————
           /*  $onlyCourseIDLeft = (count($activeCourses) === 1)
                               ? array_key_first($activeCourses)
                               : null;
            if ($onlyCourseIDLeft !== null && $slotIndex === 0) {
                // we’re down to one course; skip the morning slot so it lands in the afternoon
                continue;
            }
            // ————————————————————————————————————————————————

// --- 3. NORMAL COURSE SCHEDULING ---
            $courseID = getNextCourseForSlot(
                $remainingSessions,
                array_keys($activeCourses),
                $usedToday,
                $courseCodes,
                $onlyCourseIDLeft
            );
            if (!$courseID || ($remainingSessions[$courseID] ?? 0) <= 0) {
                continue;
            }
            $usedToday[] = $courseID; */

//##################################################################
			if (count($activeCourses) === 1) {
				// Only one course left, allow it in all slots (don't check $usedToday)
				$courseID = array_key_first($activeCourses);
			} else {
				// Usual course selection logic
				$courseID = selectNextCourse(
					$specialCourseOnlyMode,
					$specialCourseID,
					$selectedCourses,
					$remainingSessions,
					$slotIndex,
					$lockedSlot,
					$courseSlotMap,
					$activeCourses,
					$usedToday,
					$courseCodes
				);
				if (!$courseID || ($remainingSessions[$courseID] ?? 0) <= 0) continue;
				// Prevent same course twice if more than one course left
				if ($courseID && !in_array($courseID, $usedToday)) {
					$usedToday[] = $courseID;
				}
			}

}

// --- 4. SLOT LOCKING LOGIC --- We close it we need to show the last 2 courses one in the morning and other in afternoon
       /*  applySlotLocking(
            $activeCourses,
            $remainingSessions,
            $specialCourseID,
            $lockedSlot,
            $slotIndex
        ); */

// Lock this course to this slot, if not already locked
        if (!isset($courseSlotMap[$courseID])) {
            $courseSlotMap[$courseID] = $slotIndex;
        }

// --- 5. SCHEDULE THE COURSE ---
        $schedule[] = [
            'Date'           => $date,
			'SlotIndex'   => $slotIndex,                   // ← NEW
			//'Slot'       => $slotLabels[$slotIndex], // e.g. "Morning" or "Afternoon"
            'Slot'           => "Slot " . ($slotIndex + 1),
            'Time'           => format_time_slot_range($slotLabel, $from, $to, $dayName),
            'Course_ID'      => $courseID,
            'Course_Name'    => $courseNames[$courseID] ?? "Course #$courseID",
            'Start_Time'     => $from,
            'End_Time'       => $to,
            'Group_Slot_ID'  => $groupSlotId,
            'Reserve_Course' => 0
        ];
        $remainingSessions[$courseID]--;
        // If all sessions are scheduled, break out of both loops
        if (array_sum($remainingSessions) <= 0) break 2;
    }
} // End multi-slot else

} // End foreach validDates

/* // --- Make sure you already have getNextCourseForSlot() defined elsewhere in your file ---
echo "<h3>--- DEBUGGING ARRAYS ---</h3><pre>";

echo "<pre>DEBUG Program_ID: $Program_ID, Group_ID: $Group_ID</pre>";

echo "Selected Courses:\n";
print_r($selectedCourses);

echo "\nCourse Sessions (per course):\n";
print_r($courseSessions);

echo "\nPriority Courses:\n";
print_r($priorityCourses);

echo "\nSlot Labels:\n";
print_r($slotLabels);

echo "\nTime From (per slot):\n";
print_r($timeFrom);

echo "\nTime To (per slot):\n";
print_r($timeTo);

echo "\nGroup Slot IDs:\n";
print_r($group_slot_id);

echo "\nAll Slot Program IDs:\n";
print_r($all_slot_program_ids);

echo "\nGroup Slot Labels (SlotProgramID => Label):\n";
print_r($group_slot_labels);

echo "\nGroup Time From (SlotProgramID => Time):\n";
print_r($group_time_from);

echo "\nGroup Time To (SlotProgramID => Time):\n";
print_r($group_time_to);

echo "\nHoliday Dates:\n";
print_r($holidayDates);

echo "\nRetake Dates:\n";
print_r($retakeDates);

echo "\nValid Dates:\n";
print_r($validDates);

echo "\nCourse Names (CourseID => Name):\n";
print_r($courseNames);

echo "\nCourse Slot Map (CourseID => SlotProgramID):\n";
print_r($courseSlotMap);

echo "\nRemaining Sessions (CourseID => Remaining):\n";
print_r($remainingSessions);

echo "\nPushed Course (SlotProgramID => CourseID):\n";
print_r($pushedCourse);

echo "\nLocked Slot (CourseID => SlotProgramID):\n";
print_r($lockedSlot);

echo "\nSchedule (final result):\n";
print_r($schedule);

echo "</pre>"; */

/* 	echo "<pre>";
foreach ($schedule as $row) {
  echo "{$row['Date']}  slotIndex={$row['SlotIndex']}  course={$row['Course_ID']}  IsExam=".($row['IsExam']?1:0)."\n";
}
echo "</pre>"; */

// 🔍 Identify last scheduled session for each course
$lastSessions = [];
foreach ($schedule as $index => $entry) {
    $courseID = $entry['Course_ID'];
    $lastSessions[$courseID] = $index; // keeps overwriting until the last index
}

//echo "<h3>📘 Final Generated Schedule</h3><pre>"; print_r($schedule); echo "</pre>";
    //echo "<h2>📋 Generated Schedule Table</h2>";
    //echo "<p><strong>Group:</strong> " . htmlspecialchars($groupName) . "</p>";

if (!empty($schedule)) {
        
        // Collect all displayed dates: scheduled, holidays, and retakes
$displayDates = [];

// 1. From scheduled sessions
foreach ($schedule as $row) {
    $displayDates[$row['Date']][] = $row; // grouped by date
}

// 2. Add holidays (if no course scheduled on them)
foreach ($holidayDates as $hDate => $title) {
    if (!isset($displayDates[$hDate])) {
        $displayDates[$hDate] = []; // Add empty row so we render it
    }
}

foreach ($retakeDates as $rDate => $slots) {
    if (!isset($displayDates[$rDate])) {
        $displayDates[$rDate] = [];
    }
    // For each slot with a retake on this date
    foreach ($slots as $groupSlotId => $slotInfo) {
        // Check if we already have a retake for this slot/date
        $alreadyRetake = false;
        foreach ($displayDates[$rDate] as $row) {
            if (!empty($row['IsRetake']) && ($row['Slot'] == ($slotInfo['label'] ?? ''))) {
                $alreadyRetake = true;
                break;
            }
        }
        if (!$alreadyRetake) {
            $displayDates[$rDate][] = [
                'Slot'        => $slotInfo['label'] ?? null, // e.g., "Evening"
                'Time'        => isset($slotInfo['from'], $slotInfo['to'], $slotInfo['label'])
                    ? format_time_slot_range($slotInfo['label'], $slotInfo['from'], $slotInfo['to'], (new DateTime($rDate))->format('l'))
                    : null,
                'Course_ID'   => null,
                'IsRetake'    => true,
                'Retake_Type' => $slotInfo['type'] ?? null
            ];
        }
    }
}

//echo "<pre>";
//echo "\nSisplayDates (final all result):\n";
//print_r($displayDates);
//
//echo "</pre>";

// Sort the dates chronologically
ksort($displayDates);

} else {
        echo "<p style='color:red'>🚫 No schedule generated — check if valid time slots, sessions, or dates are missing.</p>";
    }

}

/*
$scheduleOutput = []; // Default
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
	//if (isset($_POST['reset']) || isset($_POST['Start_Date'])) {
     //   unset($_SESSION['deletedSaturdays']);
    //}
    // Step 1: Retrieve Form Data
    $Program_ID = intval($_POST['Program_ID']);
    $Group_ID = intval($_POST['Group_ID']);
    $Start_Date = $_POST['Start_Date'];
    $End_Date = $_POST['End_Date'] ?? date('Y-m-d', strtotime('+1 year', strtotime($Start_Date)));
    $selectedCourses = $_POST['Selected_Courses'] ?? [];
    $courseSessions = $_POST['Course_Sessions'] ?? [];
    $priorityCourses = $_POST['Priority_Course'] ?? [];
	
	$group = get_group_info($mysqli, $Group_ID);
    if (!$group) {
        echo "Group info not found.";
        exit;
    }

$slotLabels = explode(',', $group['Time_Slot']);
    $managerStart = new DateTime(trim($group['Time_From']));
    $managerEnd = new DateTime(trim($group['Time_To']));

//list($timeFrom, $timeTo) = fetch_slot_times($mysqli, $slotLabels, $managerStart, $managerEnd);
    
 $stmt = $mysqli->prepare("SELECT Group_Slot_ID, Time_Slot, Time_From, Time_To FROM Group_Slot_Mapping WHERE Group_ID = ?");
$stmt->bind_param("i", $Group_ID);
$stmt->execute();
$res = $stmt->get_result();

$slotLabels = $timeFrom = $timeTo = [];
while ($row = $res->fetch_assoc()) {
    $slotLabels[] = $row['Time_Slot'];
    $timeFrom[]   = $row['Time_From'];
    $timeTo[]     = $row['Time_To'];
    $group_slot_id[]     = $row['Group_Slot_ID'];
}
	
	$sessionLength = calculate_session_length($timeFrom, $timeTo);
    $courseSessions = calculate_course_sessions($mysqli, $Program_ID, $sessionLength);

//echo "<h3>📅 Valid Dates for Scheduling (Excluding July)</h3><pre>"; print_r($validDates); echo "</pre>";