init backend presensi

app/Modules/Academic/Services/ScheduleResolverService.php

@@ -0,0 +1,78 @@
+<?php
+
+namespace App\Modules\Academic\Services;
+
+use App\Modules\Academic\Models\ScheduleModel;
+use App\Modules\Academic\Models\StudentModel;
+
+/**
+ * Schedule Resolver Service
+ * 
+ * Handles schedule resolution logic for students.
+ */
+class ScheduleResolverService
+{
+    protected StudentModel $studentModel;
+    protected ScheduleModel $scheduleModel;
+
+    public function __construct()
+    {
+        $this->studentModel = new StudentModel();
+        $this->scheduleModel = new ScheduleModel();
+    }
+
+    /**
+     * Get active schedule for a student at a specific datetime
+     * 
+     * Rules:
+     * - Find student's class_id
+     * - Determine day_of_week from datetime (1=Monday, 7=Sunday)
+     * - Find schedule where start_time <= time < end_time
+     * 
+     * @param int $studentId Student ID
+     * @param string $datetime Datetime string (Y-m-d H:i:s format)
+     * @return array|null Returns schedule detail or null if not found
+     */
+    public function getActiveSchedule(int $studentId, string $datetime): ?array
+    {
+        // Find student
+        $student = $this->studentModel->find($studentId);
+        
+        if (!$student) {
+            return null;
+        }
+
+        // Get class_id from student
+        $classId = $student->class_id;
+
+        // Parse datetime to get day of week and time
+        $timestamp = strtotime($datetime);
+        if ($timestamp === false) {
+            return null;
+        }
+
+        // Get day of week (1=Monday, 7=Sunday)
+        // PHP date('N') returns 1-7 (Monday-Sunday)
+        $dayOfWeek = (int) date('N', $timestamp);
+
+        // Get time in H:i:s format
+        $time = date('H:i:s', $timestamp);
+
+        // Find active schedule (lesson_slots/users as source of truth with fallback to schedule columns)
+        $row = $this->scheduleModel->getActiveScheduleRow($classId, $dayOfWeek, $time);
+
+        if ($row === null) {
+            return null;
+        }
+
+        return [
+            'schedule_id'  => $row['id'],
+            'class_id'     => $row['class_id'],
+            'subject_id'   => $row['subject_id'],
+            'teacher_name' => $row['teacher_name'],
+            'room'         => $row['room'],
+            'start_time'   => $row['start_time'],
+            'end_time'     => $row['end_time'],
+        ];
+    }
+}