<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;

class adminmycoursesController extends Controller
{
    public function index()
    {
        if (!session()->has('admin_id')) {
            return redirect('/admin/login')->with('error', 'Please login first!');
        }

        // Fetch courses and manually attach modules to each course object
        $courses = DB::table('courses')->orderBy('id', 'desc')->get();

        foreach ($courses as $course) {
            $course->modules = DB::table('course_modules')
                ->where('course_id', $course->id)
                ->orderBy('semester', 'asc')
                ->orderBy('id', 'asc')
                ->get();
        }

        return view('admin.adminmycourses', compact('courses'));
    }

    // --- COURSE CRUD METHODS ---

    public function store(Request $request)
    {
        $request->validate([
            'title'       => 'required|string|max:255',
            'course_code' => 'required|string|max:50',
            'image'       => 'nullable|image|mimes:jpeg,png,jpg,gif,webp|max:2048',
            'duration'    => 'required|string',
            'level'       => 'required|string',
            'author'      => 'nullable|string',
            'desc'        => 'nullable|string',
            'status'      => 'required|string',
        ]);

        $imagePath = null;
        if ($request->hasFile('image')) {
            $imagePath = $request->file('image')->store('courses', 'public');
        }

        DB::table('courses')->insert([
            'title'       => $request->title,
            'course_code' => $request->course_code,
            'image'       => $imagePath,
            'duration'    => $request->duration,
            'level'       => $request->level,
            'author'      => $request->author ?? 'Admin',
            'desc'        => $request->desc,
            'student'     => $request->student ?? 0,
            'rating'      => $request->rating ?? 0.0,
            'badge'       => $request->badge,
            'trending'    => $request->has('trending') ? 1 : 0,
            'status'      => $request->status,
            'created_at'  => now(),
            'updated_at'  => now(),
        ]);

        return redirect()->back()->with('success', 'Course added successfully!');
    }

    public function update(Request $request, $id)
{
    $request->validate([
        'title'       => 'required|string|max:255',
        'course_code' => 'required|string|max:50',
        'image'       => 'nullable|image|mimes:jpeg,png,jpg,gif,webp|max:2048',
        'duration'    => 'required|string',
        'level'       => 'required|string',
        'status'      => 'required|string',
    ]);

    $course = DB::table('courses')->where('id', $id)->first();

    if (!$course) {
        return redirect()->back()->with('error', 'Course not found!');
    }

    $imagePath = $course->image;
    if ($request->hasFile('image')) {
        if ($course->image && Storage::disk('public')->exists($course->image)) {
            Storage::disk('public')->delete($course->image);
        }
        $imagePath = $request->file('image')->store('courses', 'public');
    }

    DB::table('courses')->where('id', $id)->update([
        'title'       => $request->title,
        'course_code' => $request->course_code,
        'image'       => $imagePath,
        'duration'    => $request->duration,
        'level'       => $request->level,
       
        'author'      => $request->author ?? $course->author ?? 'Admin',
        
        'desc'        => $request->desc ?? $request->description ?? $course->desc,
        'badge'       => $request->badge ?? $course->badge,
        'trending'    => $request->has('trending') ? 1 : 0,
        'status'      => $request->status,
        'updated_at'  => now(),
    ]);

    return redirect()->back()->with('success', 'Course updated successfully!');
}
 

    public function destroy($id)
    {
        $course = DB::table('courses')->where('id', $id)->first();

        if ($course) {
            if ($course->image && Storage::disk('public')->exists($course->image)) {
                Storage::disk('public')->delete($course->image);
            }

            // Clean up related modules
            DB::table('course_modules')->where('course_id', $id)->delete();
            DB::table('courses')->where('id', $id)->delete();

            return redirect()->back()->with('success', 'Course deleted successfully!');
        }

        return redirect()->back()->with('error', 'Course not found!');
    }

    // --- MODULE CRUD METHODS ---

    public function storeModule(Request $request)
    {
        $request->validate([
            'course_id'   => 'required',
            'module_code' => 'required|string|max:50',
            'title'       => 'required|string|max:255',
            'semester'    => 'required|string',
            'credits'     => 'nullable|integer',
            'description' => 'nullable|string',
        ]);

        DB::table('course_modules')->insert([
            'course_id'   => $request->course_id,
            'module_code' => $request->module_code,
            'title'       => $request->title,
            'semester'    => $request->semester,
            'credits'     => $request->credits,
            'description' => $request->description,
            'created_at'  => now(),
            'updated_at'  => now(),
        ]);

        return redirect()->back()->with('success', 'Module added successfully!');
    }

    public function updateModule(Request $request, $id)
    {
        $request->validate([
            'module_code' => 'required|string|max:50',
            'title'       => 'required|string|max:255',
            'semester'    => 'required|string',
            'credits'     => 'nullable|integer',
            'description' => 'nullable|string',
        ]);

        DB::table('course_modules')->where('id', $id)->update([
            'module_code' => $request->module_code,
            'title'       => $request->title,
            'semester'    => $request->semester,
            'credits'     => $request->credits,
            'description' => $request->description,
            'updated_at'  => now(),
        ]);

        return redirect()->back()->with('success', 'Module updated successfully!');
    }

    public function destroyModule($id)
    {
        DB::table('course_modules')->where('id', $id)->delete();
        return redirect()->back()->with('success', 'Module deleted successfully!');
    }
}