<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Sponsor;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\Validator;
use Illuminate\Support\Str;

class SponsorAuthController extends Controller
{
    /**
     * Register a new Sponsor account.
     *
     * Required fields: full_name, mobile, password, license_file
     * Optional: organization_name, email, nationality, city, address, country_code
     *
     * POST /api/sponsors/register
     */
    public function register(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'full_name'         => 'required|string|max:255',
            'mobile'            => 'required|string|max:50|unique:sponsors,mobile|unique:employer_profiles,phone',
            'password'          => 'required|string|min:6',
            'license_file'      => 'nullable|file|mimes:jpeg,png,jpg,pdf|max:10240',
            'emirates_id_file'  => 'nullable|file|mimes:jpeg,png,jpg,pdf|max:10240',
            'organization_name' => 'required|string|max:255',
            'email'             => 'required|email|max:255|unique:sponsors,email|unique:users,email',
            'nationality'       => 'required|string|max:100',
            'city'              => 'required|string|max:100',
            'address'           => 'required|string|max:255',
            'country_code'      => 'required|string|max:10',
            'license_expiry'    => 'nullable|date_format:Y-m-d',
            'fcm_token'         => 'nullable|string|max:255',
        ], [
            'mobile.unique'   => 'This mobile number is already registered.',
            'email.unique'    => 'This email address is already registered.',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'success' => false,
                'message' => 'Validation error.',
                'errors'  => $validator->errors()
            ], 422);
        }

        try {
            // Auto-generate email if not provided
            $mobileClean = preg_replace('/[^0-9]/', '', $request->mobile);
            $email = $request->email ?? "sponsor.{$mobileClean}@migrant.ae";
            if (!$request->email && Sponsor::where('email', $email)->exists()) {
                $email = "sponsor.{$mobileClean}." . rand(10, 99) . "@migrant.ae";
            }

            $licenseExpiry = $request->license_expiry;
            if ($request->hasFile('license_file')) {
                $licenseFile   = $request->file('license_file');
                $ocrLicense = \App\Services\OcrDocumentService::extractSponsorLicenseData($licenseFile);
                $licenseExpiry = $licenseExpiry ?? $ocrLicense['expiry_date'];
            }

            $emiratesIdPath = null;
            if ($request->hasFile('emirates_id_file')) {
                $emiratesIdFile = $request->file('emirates_id_file');
                \App\Services\OcrDocumentService::extractEmiratesIdFrontData($emiratesIdFile);
            }

            $licensePath = null;
            $apiToken = Str::random(80);

            $sponsor = DB::transaction(function () use ($request, $email, $licensePath, $emiratesIdPath, $apiToken, $licenseExpiry) {
                return Sponsor::create([
                    'full_name'         => $request->full_name,
                    'organization_name' => $request->organization_name,
                    'email'             => $email,
                    'mobile'            => $request->mobile,
                    'password'          => Hash::make($request->password),
                    'country_code'      => $request->country_code,
                    'nationality'       => $request->nationality,
                    'city'              => $request->city,
                    'address'           => $request->address,
                    'license_file'      => $licensePath,
                    'emirates_id_file'  => $emiratesIdPath,
                    'license_expiry'    => $licenseExpiry,
                    'status'            => 'active',
                    'is_verified'       => false,
                    'subscription_status' => 'none',
                    'api_token'         => $apiToken,
                    'fcm_token'         => $request->fcm_token,
                ]);
            });

            if ($request->filled('fcm_token')) {
                \App\Services\FCMService::sendPushNotification(
                    $request->fcm_token,
                    'Welcome to Migrant',
                    'Sponsor account registered successfully. Your license is pending admin review.'
                );
            }

            return response()->json([
                'success' => true,
                'message' => 'Sponsor account registered successfully. Your license is pending admin review.',
                'data'    => [
                    'sponsor' => $sponsor->makeHidden(['password', 'api_token']),
                    'token'   => $apiToken,
                ]
            ], 201);

        } catch (\Exception $e) {
            logger()->error('Sponsor Registration Failure: ' . $e->getMessage());

            return response()->json([
                'success' => false,
                'message' => 'An error occurred during registration. Please try again.',
                'error'   => app()->environment('local') ? $e->getMessage() : 'Internal Server Error'
            ], 500);
        }
    }

    /**
     * Authenticate a Sponsor and return their bearer token.
     *
     * POST /api/sponsors/login
     */
    public function login(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'mobile'    => 'required|string',
            'password'  => 'required|string',
            'fcm_token' => 'nullable|string|max:255',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'success' => false,
                'message' => 'Validation error.',
                'errors'  => $validator->errors()
            ], 422);
        }

        $sponsor = Sponsor::where('mobile', $request->mobile)->first();

        if (!$sponsor || !Hash::check($request->password, $sponsor->password)) {
            return response()->json([
                'success' => false,
                'message' => 'Invalid mobile number or password.'
            ], 401);
        }

        if ($sponsor->status === 'suspended') {
            return response()->json([
                'success' => false,
                'message' => 'Your account has been suspended. Please contact support.'
            ], 403);
        }

        // Rotate token on each login for security
        $apiToken = Str::random(80);
        $updateData = [
            'api_token'     => $apiToken,
            'last_login_at' => now(),
        ];
        if ($request->has('fcm_token')) {
            $updateData['fcm_token'] = $request->fcm_token;
        }
        $sponsor->update($updateData);

        if ($request->filled('fcm_token')) {
            \App\Services\FCMService::sendPushNotification(
                $request->fcm_token,
                'Successful Login',
                'Welcome back to your Migrant sponsor account.'
            );
        }

        return response()->json([
            'success' => true,
            'message' => 'Login successful.',
            'data'    => [
                'sponsor' => $sponsor->makeHidden(['password', 'api_token']),
                'token'   => $apiToken,
            ]
        ], 200);
    }

    /**
     * Upload Sponsor's Emirates ID Front.
     * POST /api/sponsors/register/emirates-front
     */
    public function uploadEmiratesIdFront(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'email' => 'required|string|email|max:255',
            'emirates_id_front' => 'required|file|mimes:jpeg,png,jpg,pdf|max:10240',
        ], [
            'email.required' => 'The email address is required.',
            'emirates_id_front.required' => 'Please upload the front side of your Emirates ID.',
            'emirates_id_front.mimes' => 'The Emirates ID front must be an image or a PDF.',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'success' => false,
                'message' => 'Validation error.',
                'errors' => $validator->errors()
            ], 422);
        }

        try {
            $sponsor = Sponsor::where('email', $request->email)->first();

            if (!$sponsor) {
                return response()->json([
                    'success' => false,
                    'message' => 'Sponsor account not found.'
                ], 404);
            }

            $frontFile = $request->file('emirates_id_front');
            $frontOcr = \App\Services\OcrDocumentService::extractEmiratesIdFrontData($frontFile);

            $sponsor->update([
                'emirates_id_file' => null,
            ]);

            return response()->json([
                'success' => true,
                'message' => 'Emirates ID front uploaded and processed successfully.',
                'ocr_extracted_data' => $frontOcr,
                'email' => $request->email,
            ], 200);

        } catch (\Exception $e) {
            logger()->error('API Sponsor Emirates ID Front Upload Failure: ' . $e->getMessage());
            return response()->json([
                'success' => false,
                'message' => 'An error occurred while uploading the Emirates ID front.',
                'error' => app()->environment('local') ? $e->getMessage() : 'Internal Server Error'
            ], 500);
        }
    }

    /**
     * Upload Sponsor's Emirates ID Back.
     * POST /api/sponsors/register/emirates-back
     */
    public function uploadEmiratesIdBack(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'email' => 'required|string|email|max:255',
            'emirates_id_back' => 'required|file|mimes:jpeg,png,jpg,pdf|max:10240',
        ], [
            'email.required' => 'The email address is required.',
            'emirates_id_back.required' => 'Please upload the back side of your Emirates ID.',
            'emirates_id_back.mimes' => 'The Emirates ID back must be an image or a PDF.',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'success' => false,
                'message' => 'Validation error.',
                'errors' => $validator->errors()
            ], 422);
        }

        try {
            $sponsor = Sponsor::where('email', $request->email)->first();

            if (!$sponsor) {
                return response()->json([
                    'success' => false,
                    'message' => 'Sponsor account not found.'
                ], 404);
            }

            $backFile = $request->file('emirates_id_back');
            $backOcr = \App\Services\OcrDocumentService::extractEmiratesIdBackData($backFile);

            $sponsor->update([
                'emirates_id_file' => null,
            ]);

            return response()->json([
                'success' => true,
                'message' => 'Emirates ID back uploaded and processed successfully.',
                'ocr_extracted_data' => $backOcr,
                'email' => $request->email,
            ], 200);

        } catch (\Exception $e) {
            logger()->error('API Sponsor Emirates ID Back Upload Failure: ' . $e->getMessage());
            return response()->json([
                'success' => false,
                'message' => 'An error occurred while uploading the Emirates ID back.',
                'error' => app()->environment('local') ? $e->getMessage() : 'Internal Server Error'
            ], 500);
        }
    }

    /**
     * Upload Sponsor's License document.
     * POST /api/sponsors/register/license
     */
    public function uploadLicense(Request $request)
    {
        $validator = Validator::make($request->all(), [
            'email' => 'required|string|email|max:255',
            'license_file' => 'required|file|mimes:jpeg,png,jpg,pdf|max:10240',
        ], [
            'email.required' => 'The email address is required.',
            'license_file.required' => 'Please upload the organization or trade license.',
            'license_file.mimes' => 'The license file must be an image or a PDF.',
        ]);

        if ($validator->fails()) {
            return response()->json([
                'success' => false,
                'message' => 'Validation error.',
                'errors' => $validator->errors()
            ], 422);
        }

        try {
            $sponsor = Sponsor::where('email', $request->email)->first();

            if (!$sponsor) {
                return response()->json([
                    'success' => false,
                    'message' => 'Sponsor account not found.'
                ], 404);
            }

            $licenseFile = $request->file('license_file');
            $ocrLicense = \App\Services\OcrDocumentService::extractSponsorLicenseData($licenseFile);
            $extractedExpiry = $ocrLicense['expiry_date'];

            $sponsor->update([
                'license_file' => null,
                'license_expiry' => $extractedExpiry,
            ]);

            return response()->json([
                'success' => true,
                'message' => 'License uploaded and processed successfully.',
                'ocr_extracted_data' => $ocrLicense,
                'email' => $request->email,
            ], 200);

        } catch (\Exception $e) {
            logger()->error('API Sponsor License Upload Failure: ' . $e->getMessage());
            return response()->json([
                'success' => false,
                'message' => 'An error occurred while uploading the license.',
                'error' => app()->environment('local') ? $e->getMessage() : 'Internal Server Error'
            ], 500);
        }
    }
}