<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Config;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Validation\Rule;
use Illuminate\Validation\ValidationException;

class ConfigController extends Controller
{
    public function index(): JsonResponse
    {
        $configs = Config::query()
            ->orderBy('key')
            ->get();

        return response()->json([
            'success' => true,
            'data' => [
                'configs' => $configs,
            ],
        ]);
    }

    public function store(Request $request): JsonResponse
    {
        $data = $request->validate([
            'key' => ['required', 'string', 'max:255', 'unique:configs,key'],
            'value' => ['nullable', 'string'],
            'description' => ['nullable', 'string', 'max:255'],
        ]);

        $config = Config::query()->create([
            'key' => $data['key'],
            'value' => $this->decodeValue($data['value'] ?? null),
            'description' => $data['description'] ?? null,
        ]);

        return response()->json([
            'success' => true,
            'data' => [
                'config' => $config,
            ],
        ]);
    }

    public function update(Request $request, Config $config): JsonResponse
    {
        $data = $request->validate([
            'key' => [
                'required',
                'string',
                'max:255',
                Rule::unique('configs', 'key')->ignore($config->id),
            ],
            'value' => ['nullable', 'string'],
            'description' => ['nullable', 'string', 'max:255'],
        ]);

        $config->update([
            'key' => $data['key'],
            'value' => $this->decodeValue($data['value'] ?? null),
            'description' => $data['description'] ?? null,
        ]);

        return response()->json([
            'success' => true,
            'data' => [
                'config' => $config->refresh(),
            ],
        ]);
    }

    public function destroy(Config $config): JsonResponse
    {
        $config->delete();

        return response()->json([
            'success' => true,
        ]);
    }

    private function decodeValue(?string $raw): mixed
    {
        if ($raw === null) {
            return null;
        }

        $trimmed = trim($raw);
        if ($trimmed === '') {
            return null;
        }

        $decoded = json_decode($trimmed, true);
        if (json_last_error() !== JSON_ERROR_NONE) {
            throw ValidationException::withMessages([
                'value' => 'value 必须是合法 JSON',
            ]);
        }

        return $decoded;
    }
}