<?php

namespace App\Http\Controllers\Api;

use App\Models\Supplier;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Validator;
use Symfony\Component\HttpFoundation\Response;

class SupplierController extends BaseApiController
{
    protected Supplier $supplier;

    public function __construct()
    {
        parent::__construct();
        $this->supplier = model(Supplier::class);
    }

    public function index()
    {
        $page = max(1, (int) ($this->request->getGet('page') ?? 1));
        $perPage = min(100, max(1, (int) ($this->request->getGet('per_page') ?? 20)));
        $keyword = trim((string) ($this->request->getGet('q') ?? ''));

        $query = $this->supplier->newQuery()->orderBy('name', 'ASC');

        if ($keyword !== '') {
            $query->where(function ($q) use ($keyword) {
                $q->where('name', 'LIKE', "%{$keyword}%")
                    ->orWhere('email', 'LIKE', "%{$keyword}%")
                    ->orWhere('phone', 'LIKE', "%{$keyword}%");
            });
        }

        $result = $this->paginate($query, $page, $perPage);
        return $this->success($result, 'Suppliers retrieved successfully');
    }

    public function show($id = null)
    {
        $supplier = $this->supplier->find($id);
        if (!$supplier) {
            return $this->respondError('Supplier not found', Response::HTTP_NOT_FOUND);
        }

        return $this->success($supplier, 'Supplier retrieved successfully');
    }

    public function store()
    {
        $data = $this->payloadData();
        if (empty($data)) {
            return $this->respondError('Invalid request data', Response::HTTP_BAD_REQUEST);
        }

        $rules = [
            'name'  => 'required|max:255',
            'email' => 'nullable|email',
            'phone' => 'nullable|max:50',
        ];

        $validator = Validator::make($data, $rules);
        if ($validator->fails()) {
            return $this->respondValidationError($validator->errors()->toArray());
        }

        try {
            $supplier = $this->supplier->create([
                'name'    => $data['name'],
                'email'   => $data['email'] ?? null,
                'phone'   => $data['phone'] ?? null,
                'address' => $data['address'] ?? null,
                'notes'   => $data['notes'] ?? null,
            ]);

            return $this->success($supplier->toArray(), 'Supplier created successfully', Response::HTTP_CREATED);
        } catch (\Throwable $e) {
            Log::error('Supplier creation error: ' . $e->getMessage());
            return $this->respondError('Failed to create supplier', Response::HTTP_INTERNAL_SERVER_ERROR);
        }
    }

    public function update($id = null)
    {
        $supplier = $this->supplier->find($id);
        if (!$supplier) {
            return $this->respondError('Supplier not found', Response::HTTP_NOT_FOUND);
        }

        $data = $this->payloadData();
        if (empty($data)) {
            return $this->respondError('Invalid request data', Response::HTTP_BAD_REQUEST);
        }

        $allowed = ['name', 'email', 'phone', 'address', 'notes'];
        $updateData = [];

        foreach ($allowed as $field) {
            if (array_key_exists($field, $data)) {
                $updateData[$field] = $data[$field];
            }
        }

        if (empty($updateData)) {
            return $this->respondError('No valid fields to update', Response::HTTP_BAD_REQUEST);
        }

        try {
            $this->supplier->where('id', $id)->update($updateData);
            $updated = $this->supplier->find($id);
            return $this->success($updated, 'Supplier updated successfully');
        } catch (\Throwable $e) {
            Log::error('Supplier update error: ' . $e->getMessage());
            return $this->respondError('Failed to update supplier', Response::HTTP_INTERNAL_SERVER_ERROR);
        }
    }

    public function destroy($id = null)
    {
        $supplier = $this->supplier->find($id);
        if (!$supplier) {
            return $this->respondError('Supplier not found', Response::HTTP_NOT_FOUND);
        }

        try {
            $this->supplier->delete($id);
            return $this->respondDeleted(null, 'Supplier deleted successfully');
        } catch (\Throwable $e) {
            Log::error('Supplier deletion error: ' . $e->getMessage());
            return $this->respondError('Failed to delete supplier', Response::HTTP_INTERNAL_SERVER_ERROR);
        }
    }
}