<?php

namespace App\Http\Controllers;

use App\Models\Category;
use App\Models\MusicCategory;
use App\Traits\StoresUploads;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Storage;
use Illuminate\Validation\Rule;

class CategoryController extends Controller
{
    use StoresUploads;

    public function index(Request $request)
    {
        // Playlist categories live in their own table (music_categories); serve
        // them here too so the front has one /categories?type=... entry point.
        if ($request->input('type') === Category::TYPE_PLAYLIST) {
            return response()->json($this->playlistCategories($request));
        }

        $query = Category::query()->withCount('subcategories');

        if ($request->filled('type')) {
            $query->where('type', $request->input('type'));
        }

        if ($request->boolean('with_subcategories')) {
            $query->with('subcategories');
        }

        return response()->json(
            $query->orderBy('name')->get()
        );
    }

    // Music categories normalized to the generic category shape.
    private function playlistCategories(Request $request)
    {
        $query = MusicCategory::query()->with('image')->withCount('subcategories');

        if (!$request->boolean('include_inactive')) {
            $query->where('is_active', true);
        }

        if ($request->boolean('with_subcategories')) {
            $query->with('subcategories.image');
        }

        return $query->orderBy('order')->get()->map(function ($c) use ($request) {
            return [
                'id' => $c->id,
                'name' => $c->name,
                'type' => Category::TYPE_PLAYLIST,
                'description' => $c->description,
                'icon' => $c->image?->path,
                'icon_url' => $c->image?->url,
                'order' => $c->order,
                'is_active' => $c->is_active,
                'subcategories_count' => $c->subcategories_count,
                'subcategories' => $request->boolean('with_subcategories') ? $c->subcategories : null,
                'created_at' => $c->created_at,
                'updated_at' => $c->updated_at,
            ];
        });
    }

    public function store(Request $request)
    {
        $data = $request->validate([
            'name' => [
                'required',
                'string',
                'max:255',
                Rule::unique('categories', 'name')->where('type', $request->input('type', Category::TYPE_MEDIA)),
            ],
            'type' => ['nullable', Rule::in(Category::TYPES)],
            'description' => 'nullable|string',
            'icon' => 'nullable|file|extensions:jpg,jpeg,png,gif,webp,bmp,svg|max:8192',
        ]);

        $category = Category::create([
            'name' => $data['name'],
            'type' => $data['type'] ?? Category::TYPE_MEDIA,
            'description' => $data['description'] ?? null,
            'icon' => $request->hasFile('icon')
                ? $this->storeUpload($request->file('icon'), 'categories/icons')
                : null,
        ]);

        return response()->json([
            'message' => 'Category created successfully',
            'category' => $category,
        ], 201);
    }

    public function show($id)
    {
        $category = Category::with('subcategories')->withCount('subcategories')->findOrFail($id);

        return response()->json($category);
    }

    // Category with each of its sub-categories and that sub-category's medias.
    public function grouped($id)
    {
        $category = Category::with(['subcategories' => function ($q) {
            $q->orderBy('name')->with(['media' => function ($m) {
                $m->with(['image', 'detailImage', 'tags'])->latest();
            }]);
        }])->findOrFail($id);

        return response()->json([
            'category' => [
                'id' => $category->id,
                'name' => $category->name,
                'description' => $category->description,
                'icon_url' => $category->icon_url,
                'type' => $category->type,
            ],
            'sub_categories' => $category->subcategories->map(fn ($sub) => [
                'sub_category' => [
                    'id' => $sub->id,
                    'name' => $sub->name,
                    'description' => $sub->description,
                ],
                'medias' => $sub->media,
            ])->values(),
        ]);
    }

    public function update(Request $request, $id)
    {
        $category = Category::findOrFail($id);

        $targetType = $request->input('type', $category->type);

        $data = $request->validate([
            'name' => [
                'sometimes',
                'string',
                'max:255',
                Rule::unique('categories', 'name')
                    ->where('type', $targetType)
                    ->ignore($category->id),
            ],
            'type' => ['nullable', Rule::in(Category::TYPES)],
            'description' => 'nullable|string',
            'icon' => 'nullable|file|extensions:jpg,jpeg,png,gif,webp,bmp,svg|max:8192',
        ]);

        if (array_key_exists('type', $data) && $data['type'] !== null) {
            $category->type = $data['type'];
        }
        if (array_key_exists('name', $data)) {
            $category->name = $data['name'];
        }
        if (array_key_exists('description', $data)) {
            $category->description = $data['description'];
        }
        if ($request->hasFile('icon')) {
            if ($category->icon) {
                Storage::disk('public')->delete($category->icon);
            }
            $category->icon = $this->storeUpload($request->file('icon'), 'categories/icons');
        }

        $category->save();

        return response()->json([
            'message' => 'Category updated successfully',
            'category' => $category,
        ]);
    }

    public function destroy($id)
    {
        $category = Category::findOrFail($id);

        if ($category->icon) {
            Storage::disk('public')->delete($category->icon);
        }

        $category->delete();

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