<?php

declare(strict_types=1);

namespace App\Http\Controllers\Api\Admin;

use App\Http\Controllers\Controller;
use App\Models\Client;
use App\Services\Auth\TokenService;
use App\Services\LogService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Validation\ValidationException;

class ClientController extends Controller
{
    public function __construct(
        private readonly LogService $logService,
        private readonly TokenService $tokenService
    ) {}

    public function index(Request $request): JsonResponse
    {
        $admin = $request->admin;
        $query = $admin->isSuperAdmin() ? Client::query() : $admin->clients();

        $clients = $query->with('llmProvider')->get();
        return response()->json($clients);
    }

    public function store(Request $request): JsonResponse
    {
        try {
            $validated = $request->validate([
                'name' => 'required|string|max:100',
                'llm_provider_id' => 'required|exists:llm_providers,id',
            ]);

            DB::beginTransaction();

            $client = Client::create($validated);

            // Associate client with admin
            $request->admin->clients()->attach($client->id);

            $this->logService->logOperation(
                'admin',
                $request->admin->id,
                "Created client: {$client->name}"
            );

            DB::commit();
            return response()->json($client, 201);

        } catch (ValidationException $e) {
            DB::rollBack();
            return response()->json([
                'error' => 'validation_error',
                'message' => '请求参数验证失败。',
                'errors' => $e->errors(),
            ], 422);
        } catch (\Exception $e) {
            DB::rollBack();
            Log::error('Error creating client', [
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);

            return response()->json([
                'error' => 'server_error',
                'message' => '服务器内部错误。',
            ], 500);
        }
    }

    public function update(Request $request, int $id): JsonResponse
    {
        try {
            $client = $this->getAuthorizedClient($request->admin, $id);

            $validated = $request->validate([
                'name' => 'required|string|max:100',
                'llm_provider_id' => 'required|exists:llm_providers,id',
            ]);

            $client->update($validated);

            $this->logService->logOperation(
                'admin',
                $request->admin->id,
                "Updated client: {$client->name}"
            );

            return response()->json($client);

        } catch (ValidationException $e) {
            return response()->json([
                'error' => 'validation_error',
                'message' => '请求参数验证失败。',
                'errors' => $e->errors(),
            ], 422);
        } catch (\Exception $e) {
            Log::error('Error updating client', [
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);

            return response()->json([
                'error' => 'server_error',
                'message' => '服务器内部错误。',
            ], 500);
        }
    }

    public function destroy(Request $request, int $id): JsonResponse
    {
        try {
            $client = $this->getAuthorizedClient($request->admin, $id);

            $clientName = $client->name;
            $client->delete();

            $this->logService->logOperation(
                'admin',
                $request->admin->id,
                "Deleted client: {$clientName}"
            );

            return response()->json([
                'message' => '客户用户已删除。',
            ]);

        } catch (\Exception $e) {
            Log::error('Error deleting client', [
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);

            return response()->json([
                'error' => 'server_error',
                'message' => '服务器内部错误。',
            ], 500);
        }
    }

    public function generateAuthToken(Request $request, int $id): JsonResponse
    {
        try {
            $client = $this->getAuthorizedClient($request->admin, $id);

            $validated = $request->validate([
                'expires_in_days' => 'nullable|integer|min:1',
            ]);

            $token = $this->tokenService->generateAuthToken(
                $client,
                $validated['expires_in_days'] ?? null
            );

            $this->logService->logOperation(
                'admin',
                $request->admin->id,
                "Generated auth token for client: {$client->name}"
            );

            return response()->json([
                'client_id' => $client->id,
                'auth_token' => $token->token,
                'created_at' => $token->created_at,
                'expires_at' => $token->expires_at,
            ]);

        } catch (ValidationException $e) {
            return response()->json([
                'error' => 'validation_error',
                'message' => '请求参数验证失败。',
                'errors' => $e->errors(),
            ], 422);
        } catch (\Exception $e) {
            Log::error('Error generating auth token', [
                'error' => $e->getMessage(),
                'trace' => $e->getTraceAsString(),
            ]);

            return response()->json([
                'error' => 'server_error',
                'message' => '服务器内部错误。',
            ], 500);
        }
    }

    private function getAuthorizedClient($admin, int $id): Client
    {
        $query = $admin->isSuperAdmin() ? Client::query() : $admin->clients();

        $client = $query->findOrFail($id);

        return $client;
    }
}