<?php namespace App\Http\Controllers\App;


use Illuminate\Http\Request;
use App\Http\Controllers\Controller;
use App\Models\Client;
use App\Services\ClientTierService;
use Notsoweb\ApiResponse\Enums\ApiResponse;

class ClientController extends Controller
{
    protected ClientTierService $clientTierService;

    public function __construct(ClientTierService $clientTierService)
    {
        $this->clientTierService = $clientTierService;
    }
    public function index(Request $request)
    {
        $query = Client::query();

        if ($request->has('with')) {
            $relations = explode(',', $request->with);
            $query->with($relations);
        }

        if ($request->has('client_number') && $request->client_number) {
            $query->where('client_number', 'like', "%{$request->client_number}%");
        }

        elseif ($request->has('q') && $request->q) {
            $query->where(function($q) use ($request) {
                $q->where('name', 'like', "%{$request->q}%")
                ->orWhere('email', 'like', "%{$request->q}%")
                ->orWhere('rfc', 'like', "%{$request->q}%");
            });
        }

        return ApiResponse::OK->response([
            'clients' => $query->paginate(config('app.pagination')),
        ]);
    }

    public function show(Client $client)
    {
        return ApiResponse::OK->response([
            'client' => $client
        ]);
    }

    public function store(Request $request)
    {
        $request->validate([
            'name' => 'nullable|string|max:255',
            'email' => 'nullable|email|max:255',
            'phone' => 'nullable|string|max:20',
            'address' => 'nullable|string|max:500',
            'rfc' => 'required|string|max:13',
            'razon_social' => 'nullable|string|max:255',
            'regimen_fiscal' => 'nullable|string|max:100',
            'cp_fiscal' => 'nullable|string|max:5',
            'uso_cfdi' => 'nullable|string|max:100',
        ],[
            'email.unique' => 'El correo electrónico ya está en uso por otro cliente.',
            'phone.unique' => 'El teléfono ya está en uso por otro cliente.',
            'rfc.unique' => 'El RFC ya está en uso por otro cliente.',
            'rfc.required' => 'El RFC es obligatorio.',
        ]);

        try{
            $data = $request->only([
                'name',
                'email',
                'phone',
                'address',
                'rfc',
                'razon_social',
                'regimen_fiscal',
                'cp_fiscal',
                'uso_cfdi',
            ]);

            // Usar RFC como client_number
            $data['client_number'] = $data['rfc'] ?? null;

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

            // Cargar relación tier
            $client->load('tier');

            return ApiResponse::OK->response([
                'client' => $client,
                'message' => 'Cliente creado correctamente.'
            ]);

        }catch(\Exception $e){
            return ApiResponse::BAD_REQUEST->response([
                'message' => 'Error al crear el cliente.'
            ]);
        }
    }

    public function update(Request $request, Client $client)
    {
        $request->validate([
            'name' => 'nullable|string|max:255',
            'email' => 'nullable|email|max:255',
            'phone' => 'nullable|string|max:20',
            'address' => 'nullable|string|max:500',
            'rfc' => 'nullable|string|max:13',
        ],[
            'email.unique' => 'El correo electrónico ya está en uso por otro cliente.',
            'phone.unique' => 'El teléfono ya está en uso por otro cliente.',
            'rfc.unique' => 'El RFC ya está en uso por otro cliente.',
        ]);

        try{

            $data = $request->only([
                'name',
                'email',
                'phone',
                'address',
                'rfc',
                'razon_social',
                'regimen_fiscal',
                'cp_fiscal',
                'uso_cfdi',
            ]);

            // Mantener client_number sincronizado con RFC cuando se actualiza
            if ($request->filled('rfc')) {
                $data['client_number'] = $data['rfc'];
            }

            $client->update($data);

            return ApiResponse::OK->response([
                'client' => $client,
                'message' => 'Cliente actualizado correctamente.'
            ]);

        }catch(\Exception $e){
            return ApiResponse::BAD_REQUEST->response([
                'message' => 'Error al actualizar el cliente.'
            ]);
        }
    }

    public function destroy(Client $client)
    {
        try{
            $client->delete();

            return ApiResponse::OK->response([
                'message' => 'Cliente eliminado correctamente.'
            ]);

        }catch(\Exception $e){
            return ApiResponse::BAD_REQUEST->response([
                'message' => 'Error al eliminar el cliente.'
            ]);
        }
    }

    /**
     * Obtener estadísticas de compra del cliente
     */
    public function stats(Client $client)
    {
        try {
            $stats = $this->clientTierService->getClientStats($client);

            return ApiResponse::OK->response([
                'stats' => $stats
            ]);
        } catch(\Exception $e) {
            return ApiResponse::BAD_REQUEST->response([
                'message' => 'Error al obtener estadísticas del cliente.'
            ]);
        }
    }

    /**
     * Obtener historial de cambios de tier del cliente
     */
    public function tierHistory(Client $client)
    {
        try {
            $history = $client->tierHistory()
                ->with(['oldTier', 'newTier'])
                ->orderBy('changed_at', 'desc')
                ->get();

            return ApiResponse::OK->response([
                'history' => $history
            ]);
        } catch(\Exception $e) {
            return ApiResponse::BAD_REQUEST->response([
                'message' => 'Error al obtener historial del cliente.'
            ]);
        }
    }

    /**
     * Obtener ventas con descuento de un cliente
     */
    public function salesWithDiscounts(Client $client, Request $request)
    {
        try {
            $query = $client->sales()
                ->where('discount_amount', '>', 0)
                ->with(['details', 'user:id,name'])
                ->orderBy('created_at', 'desc');

            // Filtro por rango de fechas
            if ($request->has('date_from')) {
                $query->where('created_at', '>=', $request->date_from);
            }

            if ($request->has('date_to')) {
                $query->where('created_at', '<=', $request->date_to);
            }

            $sales = $query->paginate($request->per_page ?? 15);

            // Calcular totales
            $totals = [
                'total_sales' => $client->sales()->where('discount_amount', '>', 0)->count(),
                'total_amount' => $client->sales()->where('discount_amount', '>', 0)->sum('total'),
                'total_discounts' => $client->sales()->where('discount_amount', '>', 0)->sum('discount_amount'),
            ];

            return ApiResponse::OK->response([
                'sales' => $sales,
                'totals' => $totals
            ]);
        } catch(\Exception $e) {
            return ApiResponse::BAD_REQUEST->response([
                'message' => 'Error al obtener ventas con descuentos.',
                'error' => $e->getMessage()
            ]);
        }
    }
}