<?php

namespace App\Http\Controllers;

use App\Models\MusicPlaylist;
use App\Traits\HandlesImageUpload;
use Illuminate\Http\Request;
use Illuminate\Support\Str;

class MusicPlaylistController extends Controller
{
    use HandlesImageUpload;

   public function index(Request $request, $categoryId = null)
        {
            $query = MusicPlaylist::with(['categories', 'subcategories', 'image', 'detailImage']);

            $categoryId = $categoryId ?? $request->input('category_id');

            if ($categoryId) {
                $query->whereHas('categories', function ($q) use ($categoryId) {
                    $q->where('music_categories.id', $categoryId);
                });
            }

            if ($request->filled('subcategory_id')) {
                $subcategoryId = $request->input('subcategory_id');
                $query->whereHas('subcategories', function ($q) use ($subcategoryId) {
                    $q->where('music_subcategories.id', $subcategoryId);
                });
            }

            $playlists = $query->where('is_active', true)->orderBy('order')->get();

            return response()->json($playlists);
        }
            
    public function store(Request $request)
{
    $data = $request->validate([
        'category_ids' => 'nullable|array',
        'category_ids.*' => 'integer|exists:music_categories,id',
        'subcategory_ids' => 'nullable|array',
        'subcategory_ids.*' => 'integer|exists:music_subcategories,id',
        'name' => 'required|string|max:255',
        'description' => 'nullable|string',
        'image_id' => 'nullable|exists:images,id',
        'image' => 'nullable|file|extensions:jpg,jpeg,png,gif,webp,bmp,svg|max:8192',
        'detail_image_id' => 'nullable|exists:images,id',
        'detail_image' => 'nullable|file|extensions:jpg,jpeg,png,gif,webp,bmp,svg|max:8192',
        'order' => 'nullable|integer',
        'is_active' => 'nullable|boolean',
    ]);

    // Ensure at least one category or subcategory is provided
    if (empty($data['category_ids']) && empty($data['subcategory_ids'])) {
        return response()->json([
            'message' => 'At least one category or subcategory is required'
        ], 422);
    }

    $data['slug'] = $this->uniqueSlug($data['name']);

    // An uploaded image file takes precedence over a provided image_id.
    $data['image_id'] = $this->uploadedImageId($request) ?? ($data['image_id'] ?? null);
    $data['detail_image_id'] = $this->uploadedImageId($request, 'detail_image') ?? ($data['detail_image_id'] ?? null);

    $playlist = MusicPlaylist::create($data);

    $playlist->categories()->sync($data['category_ids'] ?? []);
    $playlist->subcategories()->sync($data['subcategory_ids'] ?? []);

    return response()->json([
        'message' => 'Playlist created successfully',
        'playlist' => $playlist->load(['categories', 'subcategories', 'image', 'detailImage'])
    ], 201);
}
    
    public function show($id)
        {
            $playlist = MusicPlaylist::with([
                'categories',
                'subcategories',
                'image',
                'detailImage',
                'musics' => function($q) {
                    $q->where('music.is_active', true)
                    ->with(['image', 'tags'])
                    ->orderBy('music_playlist.order');
                },
                'comments' => function($q) { // Add comments relationship
                    $q->with('user')->latest()->limit(10);
                }
            ])->findOrFail($id);
            $userComment = $playlist->userComment();
            $comments = $playlist->comments()
                ->with('user')
                ->latest()
                ->paginate(15);
            
            return response()->json([
                 $playlist,
                'statistics' => [
                    'total_musics' => $playlist->musics->count(),
                    'total_duration' => $playlist->total_duration,
                    'total_comments' => $playlist->comments_count,
                    'total_likes' => $playlist->likes_count,
                    'total_saves' => $playlist->saved_count,
                ],
                'user_interaction' => [
                    'has_commented' => $playlist->has_user_commented,
                    'user_comment' => $playlist->user_comment,
                    'user_comment_id' => $playlist->user_comment_id,
                    'has_liked' => $playlist->is_liked,
                    'has_saved' => $playlist->is_saved,
                ],
                'comments' => $comments,
            ]);
        }
    
    public function update(Request $request, $id)
    {
        $playlist = MusicPlaylist::findOrFail($id);
        
        $data = $request->validate([
            'category_ids' => 'sometimes|array',
            'category_ids.*' => 'integer|exists:music_categories,id',
            'subcategory_ids' => 'sometimes|array',
            'subcategory_ids.*' => 'integer|exists:music_subcategories,id',
            'name' => 'sometimes|string|max:255',
            'description' => 'nullable|string',
            'image_id' => 'nullable|exists:images,id',
            'image' => 'nullable|file|extensions:jpg,jpeg,png,gif,webp,bmp,svg|max:8192',
            'detail_image_id' => 'nullable|exists:images,id',
            'detail_image' => 'nullable|file|extensions:jpg,jpeg,png,gif,webp,bmp,svg|max:8192',
            'order' => 'nullable|integer',
            'is_active' => 'nullable|boolean',
        ]);

        if (isset($data['name'])) {
            $data['slug'] = $this->uniqueSlug($data['name'], $playlist->id);
        }

        // An uploaded image file takes precedence over a provided image_id.
        if (($uploadedImageId = $this->uploadedImageId($request)) !== null) {
            $data['image_id'] = $uploadedImageId;
        }
        if (($uploadedDetailImageId = $this->uploadedImageId($request, 'detail_image')) !== null) {
            $data['detail_image_id'] = $uploadedDetailImageId;
        }

        $playlist->update($data);

        if (array_key_exists('category_ids', $data)) {
            $playlist->categories()->sync($data['category_ids'] ?? []);
        }

        if (array_key_exists('subcategory_ids', $data)) {
            $playlist->subcategories()->sync($data['subcategory_ids'] ?? []);
        }

        return response()->json([
            'message' => 'Playlist updated successfully',
            'playlist' => $playlist->load(['categories', 'subcategories', 'image', 'detailImage'])
        ]);
    }
    
    // Build a slug that is unique within music_playlists. Persian names often
    // transliterate to the same/empty value, so we fall back and add a counter.
    private function uniqueSlug(string $name, ?int $ignoreId = null): string
    {
        $base = Str::slug($name);
        if ($base === '') {
            $base = 'playlist';
        }

        $slug = $base;
        $i = 2;
        while (
            MusicPlaylist::where('slug', $slug)
                ->when($ignoreId, fn ($q) => $q->where('id', '!=', $ignoreId))
                ->exists()
        ) {
            $slug = "{$base}-{$i}";
            $i++;
        }

        return $slug;
    }

    public function destroy($id)
    {
        $playlist = MusicPlaylist::findOrFail($id);
        $playlist->delete();

        return response()->json(['message' => 'Playlist deleted successfully']);
    }
}