<?php

namespace App\Http\Controllers\Api\V1;

use App\Http\Controllers\Controller;
use App\Http\Requests\PairingLookupRequest;
use App\Http\Requests\PairingOtpRequest;
use App\Http\Requests\PairingOtpVerifyRequest;
use App\Models\Registration;
use App\Services\OtpService;
use App\Services\PairingTokenService;
use Illuminate\Http\Request;

class PairingController extends Controller
{
    public function lookup(PairingLookupRequest $request)
    {
        $code = $request->validated()['registration_code'];

        $registration = Registration::where('registration_code', $code)
            ->with('player', 'flightMember.flight.members.registration.player')
            ->firstOrFail();

        $flightMember = $registration->flightMember;
        $flight = $flightMember?->flight;

        $members = [];
        if ($flight) {
            foreach ($flight->members as $m) {
                $members[] = [
                    'seat' => (int) $m->seat_no,
                    'name' => $m->registration?->player?->name,
                    'band' => $m->registration?->handicap_band,
                    'hcp' => $m->registration?->handicap_value,
                    'is_you' => $m->registration_id === $registration->id,
                ];
            }
        }

        return response()->json([
            'registration' => [
                'status' => $registration->status,
                'player' => [
                    'name' => $registration->player->name,
                    'band' => $registration->handicap_band,
                    'handicap' => $registration->handicap_value,
                ],
                'preferences' => [
                    'pairing_mode' => $registration->pairing_mode,
                    'pairing_mode_label' => strtolower($registration->pairing_mode) === 'LEVEL' ? 'level' : (strtolower($registration->pairing_mode) === 'RANDOM' ? 'random' : 'balanced'),
                ],
            ],
            'flight' => $flight ? [
                'code' => $flight->code,
                'course' => $flight->course,
                'start_hole' => (int) $flight->start_hole,
                'start_tee' => $flight->start_tee,
                'is_final' => $flight->status === 'FINAL',
            ] : null,
            'members' => $members,
        ]);
    }


    public function requestOtp(PairingOtpRequest $request, OtpService $otpService)
    {
        $registrationId = $request->validated()['registration_id'];
        $registration = Registration::with('player')->findOrFail($registrationId);

        $otpService->sendPairingOtp($registration);

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

    public function verifyOtp(PairingOtpVerifyRequest $request, OtpService $otpService, PairingTokenService $tokenService)
    {
        $data = $request->validated();
        $registration = Registration::with('player')->findOrFail($data['registration_id']);

        $otpService->verifyPairingOtp($registration, $data['otp']);

        $token = $tokenService->issue($registration->id);

        return response()->json([
            'pairing_token' => $token,
        ]);
    }

    public function me(Request $request, PairingTokenService $tokenService)
    {
        $auth = $request->header('Authorization', '');
        if (!str_starts_with($auth, 'Bearer ')) {
            return response()->json(['message' => 'Unauthorized'], 401);
        }
        $token = trim(substr($auth, 7));

        $registrationId = $tokenService->verify($token);
        if (!$registrationId) {
            return response()->json(['message' => 'Unauthorized'], 401);
        }

        $registration = Registration::with('player', 'flightMember.flight.members.registration.player')
            ->findOrFail($registrationId);

        $flightMember = $registration->flightMember;
        $flight = $flightMember?->flight;

        // Build members array for diagram (seat 1..4)
        $members = [];
        if ($flight) {
            foreach ($flight->members as $m) {
                $members[] = [
                    'seat' => (int) $m->seat_no,
                    'name' => $m->registration?->player?->name,
                    'band' => $m->registration?->handicap_band,
                    'hcp' => $m->registration?->handicap_value,
                    'is_you' => $m->registration_id === $registration->id,
                ];
            }
        }

        return response()->json([
            'registration' => [
                'status' => $registration->status,
                'player' => [
                    'name' => $registration->player->name,
                    'band' => $registration->handicap_band,
                    'handicap' => $registration->handicap_value,
                ],
                // Optional for UI copy; can be expanded later:
                'preferences' => [
                    'pairing_mode' => $registration->pairing_mode,
                    'pairing_mode_label' => strtolower($registration->pairing_mode) === 'LEVEL' ? 'level' : (strtolower($registration->pairing_mode) === 'RANDOM' ? 'random' : 'balanced'),
                ],
            ],
            'flight' => $flight ? [
                'code' => $flight->code,
                'course' => $flight->course,
                'start_hole' => (int) $flight->start_hole,
                'start_tee' => $flight->start_tee,
                'is_final' => $flight->status === 'FINAL',
            ] : null,
            'members' => $members,
        ]);
    }

    private function maskPhone(string $phone): string
    {
        // crude masking; adjust as needed for E164 normalization
        $digits = preg_replace('/\D+/', '', $phone);
        if (strlen($digits) <= 4) return '+**' . $digits;
        $last4 = substr($digits, -4);
        return '+'.substr($digits, 0, 2) . '***' . $last4;
    }
}