<?php

declare(strict_types=1);

namespace App\Http\Controllers\Api\V1\Auth;

use App\Http\Controllers\Controller;
use App\Http\Requests\Api\V1\Auth\MfaConfirmRequest;
use App\Http\Requests\Api\V1\Auth\MfaDisableRequest;
use App\Enums\MfaMethod;
use App\Services\MfaService;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;

final class MfaSetupController extends Controller
{
    public function __construct(
        private MfaService $mfaService,
    ) {}

    public function setupTotp(Request $request): JsonResponse
    {
        $user = $request->user();
        $data = $this->mfaService->setupTotp($user);

        return $this->success($data, 'TOTP setup started');
    }

    public function confirmTotp(MfaConfirmRequest $request): JsonResponse
    {
        $user = $request->user();

        try {
            $backupCodes = $this->mfaService->confirmTotp($user, $request->validated('code'));
        } catch (\DomainException $e) {
            return $this->error($e->getMessage(), 422);
        }

        return $this->success([
            'mfa_enabled' => true,
            'method' => MfaMethod::TOTP->value,
            'backup_codes' => $backupCodes,
        ], 'TOTP enabled');
    }

    public function setupEmail(Request $request): JsonResponse
    {
        $user = $request->user();

        try {
            $this->mfaService->setupEmail($user);
        } catch (\DomainException $e) {
            return $this->error($e->getMessage(), 429);
        }

        return $this->success(null, 'Verification code sent');
    }

    public function confirmEmail(MfaConfirmRequest $request): JsonResponse
    {
        $user = $request->user();

        try {
            $backupCodes = $this->mfaService->confirmEmail($user, $request->validated('code'));
        } catch (\DomainException $e) {
            return $this->error($e->getMessage(), 422);
        }

        return $this->success([
            'mfa_enabled' => true,
            'method' => MfaMethod::EMAIL->value,
            'backup_codes' => $backupCodes,
        ], 'Email MFA enabled');
    }

    public function disable(MfaDisableRequest $request): JsonResponse
    {
        $user = $request->user();

        if (! $user->mfa_enabled) {
            return $this->error('MFA is niet ingeschakeld.', 422);
        }

        // Verify the code before disabling
        $method = MfaMethod::from($request->validated('method'));
        $code = $request->validated('code');

        try {
            if ($method === MfaMethod::TOTP) {
                $secret = decrypt($user->mfa_secret);
                $google2fa = app(\PragmaRX\Google2FA\Google2FA::class);
                if (! $google2fa->verifyKey($secret, $code, 1)) {
                    throw new \DomainException('Ongeldige verificatiecode.');
                }
            } elseif ($method === MfaMethod::BACKUP_CODE) {
                // Backup code verification is handled by verifying against stored hashes
                // We need to check manually here since verifyBackupCode is private
                $this->verifyBackupCodeForDisable($user, $code);
            }
        } catch (\DomainException $e) {
            return $this->error($e->getMessage(), 422);
        }

        $this->mfaService->disable($user);

        return $this->success(null, 'MFA disabled');
    }

    public function regenerateBackupCodes(MfaConfirmRequest $request): JsonResponse
    {
        $user = $request->user();

        // Verify TOTP code before regenerating
        try {
            if ($user->mfa_method === MfaMethod::TOTP->value) {
                $secret = decrypt($user->mfa_secret);
                $google2fa = app(\PragmaRX\Google2FA\Google2FA::class);
                if (! $google2fa->verifyKey($secret, $request->validated('code'), 1)) {
                    throw new \DomainException('Ongeldige verificatiecode.');
                }
            }

            $codes = $this->mfaService->regenerateBackupCodes($user);
        } catch (\DomainException $e) {
            return $this->error($e->getMessage(), 422);
        }

        return $this->success([
            'backup_codes' => $codes,
        ], 'Backup codes regenerated');
    }

    public function status(Request $request): JsonResponse
    {
        $user = $request->user();

        return $this->success([
            'mfa_enabled' => $user->mfa_enabled,
            'method' => $user->mfa_method,
            'confirmed_at' => $user->mfa_confirmed_at?->toIso8601String(),
            'backup_codes_remaining' => $this->mfaService->getRemainingBackupCodeCount($user),
            'is_required' => $this->mfaService->isMfaRequired($user),
        ]);
    }

    private function verifyBackupCodeForDisable(\App\Models\User $user, string $code): void
    {
        $normalizedCode = strtoupper(str_replace([' ', '-'], '', $code));

        $backupCodes = \App\Models\MfaBackupCode::where('user_id', $user->id)
            ->where('used', false)
            ->get();

        foreach ($backupCodes as $backupCode) {
            if (\Illuminate\Support\Facades\Hash::check($code, $backupCode->code_hash) ||
                \Illuminate\Support\Facades\Hash::check($normalizedCode, $backupCode->code_hash)) {
                $backupCode->update([
                    'used' => true,
                    'used_at' => now(),
                ]);

                return;
            }
        }

        throw new \DomainException('Ongeldige backup code.');
    }
}