<?php

namespace App\Http\Controllers;

use App\Models\SubCategory;
use Illuminate\Http\Request;

class SubCategoryController extends Controller
{
    public function index(Request $request, $categoryId = null)
    {
        $query = SubCategory::with('category')->withCount('media');

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

        if ($categoryId) {
            $query->where('category_id', $categoryId);
        }

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

    public function store(Request $request)
    {
        $data = $request->validate([
            'category_id' => 'required|exists:categories,id',
            'name' => 'required|string|max:255',
        ]);

        $existing = SubCategory::where('category_id', $data['category_id'])
            ->where('name', $data['name'])
            ->first();

        if ($existing) {
            return response()->json([
                'message' => 'A subcategory with this name already exists in this category',
                'errors' => ['name' => ['The subcategory name must be unique within this category.']],
            ], 422);
        }

        $subCategory = SubCategory::create($data);

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

    public function show($id)
    {
        $subCategory = SubCategory::with('category')->withCount('media')->findOrFail($id);

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

    public function update(Request $request, $id)
    {
        $subCategory = SubCategory::findOrFail($id);

        $data = $request->validate([
            'category_id' => 'sometimes|exists:categories,id',
            'name' => 'sometimes|string|max:255',
        ]);

        $categoryId = $data['category_id'] ?? $subCategory->category_id;
        $name = $data['name'] ?? $subCategory->name;

        $existing = SubCategory::where('category_id', $categoryId)
            ->where('name', $name)
            ->where('id', '!=', $subCategory->id)
            ->first();

        if ($existing) {
            return response()->json([
                'message' => 'A subcategory with this name already exists in this category',
                'errors' => ['name' => ['The subcategory name must be unique within this category.']],
            ], 422);
        }

        $subCategory->update($data);

        return response()->json([
            'message' => 'Subcategory updated successfully',
            'sub_category' => $subCategory->load('category'),
        ]);
    }

    public function destroy($id)
    {
        $subCategory = SubCategory::findOrFail($id);
        $subCategory->delete();

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