first commit

app/Http/Controllers/CourseLibraryController.php

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+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\Course;
+use App\Models\Level;
+use App\Models\Enrollment;
+use Illuminate\Http\Request;
+use Inertia\Inertia;
+use Inertia\Response;
+
+class CourseLibraryController extends Controller
+{
+    /**
+     * Display the course library.
+     */
+    public function index(): Response
+    {
+        $levels = Level::with(['courses' => function($query) {
+            $query->withCount('modules');
+        }])->get();
+
+        $enrolledCourseIds = Enrollment::where('user_id', auth()->id())
+            ->pluck('course_id')
+            ->toArray();
+
+        return Inertia::render('Courses/Library', [
+            'levels' => $levels->map(function($level) use ($enrolledCourseIds) {
+                return [
+                    'id' => $level->id,
+                    'name' => $level->name,
+                    'code' => $level->code,
+                    'courses' => $level->courses->map(function($course) use ($enrolledCourseIds) {
+                        return [
+                            'id' => $course->id,
+                            'title' => $course->title,
+                            'description' => $course->description,
+                            'thumbnail' => $course->thumbnail_url,
+                            'slug' => $course->slug,
+                            'modulesCount' => $course->modules_count,
+                            'isEnrolled' => in_array($course->id, $enrolledCourseIds),
+                        ];
+                    })
+                ];
+            })
+        ]);
+    }
+
+    /**
+     * Enroll in a course.
+     */
+    public function enroll(Request $request, Course $course)
+    {
+        $user = auth()->user();
+
+        // Check if already enrolled
+        $exists = Enrollment::where('user_id', $user->id)
+            ->where('course_id', $course->id)
+            ->exists();
+
+        if (!$exists) {
+            Enrollment::create([
+                'user_id' => $user->id,
+                'course_id' => $course->id,
+                'status' => 'active',
+                'enrolled_at' => now(),
+            ]);
+        }
+
+        return redirect()->route('courses.learn', ['course' => $course->slug])
+            ->with('status', "Berhasil mendaftar di kursus: {$course->title}");
+    }
+}