<?php

declare(strict_types=1);

namespace App\Services;

use App\Enums\AlertChannel;
use App\Enums\AlertSeverity;
use App\Enums\AlertType;
use App\Models\Miscellaneous\AlertLog;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Mail;
use Throwable;

class AlertService
{
    private bool $emailEnabled;

    private bool $discordEnabled;

    private string $discordWebhookUrl;

    private string $alertEmail;

    private readonly string $siteName;

    public function __construct()
    {
        $this->emailEnabled = (bool) setting('alert_email_enabled', false);
        $this->discordEnabled = (bool) setting('alert_discord_enabled', false);
        $this->discordWebhookUrl = setting('alert_discord_webhook_url', '');
        $this->alertEmail = setting('alert_email_address', '');
        $this->siteName = setting('hotel_name', config('app.name', 'Atom CMS'));
    }

    public function send(
        AlertType $type,
        string $message,
        array $context = [],
        AlertChannel $channel = AlertChannel::BOTH,
    ): void {
        $this->logAlert($type, $message, $context);

        $channels = $this->resolveChannels($channel);

        foreach ($channels as $ch) {
            match ($ch) {
                AlertChannel::EMAIL => $this->sendEmail($type, $message, $context),
                AlertChannel::DISCORD => $this->sendDiscord($type, $message, $context),
                default => null,
            };
        }
    }

    public function sendCritical(AlertType $type, string $message, array $context = []): void
    {
        $this->send($type, $message, $context, AlertChannel::BOTH);
    }

    public function sendEmulatorOffline(string $error = ''): void
    {
        $this->send(
            AlertType::EMULATOR_OFFLINE,
            'De emulator is offline of niet bereikbaar via RCON.',
            ['error' => $error],
        );
    }

    public function sendEmulatorOnline(): void
    {
        $this->send(
            AlertType::EMULATOR_ONLINE,
            'De emulator is weer online en verbonden via RCON.',
            [],
            AlertChannel::BOTH,
        );
    }

    public function sendDDoSDetected(array $details): void
    {
        $message = sprintf(
            'Mogelijke DDoS aanval gedetecteerd! %d requests in %d seconden van %d unieke IPs.',
            $details['total_requests'] ?? 0,
            $details['time_window'] ?? 0,
            $details['unique_ips'] ?? 0,
        );

        $this->send(AlertType::DDOS_DETECTED, $message, $details);
    }

    public function sendCriticalError(string $error, ?Throwable $exception = null): void
    {
        $context = [
            'error' => $error,
            'exception_class' => $exception instanceof Throwable ? $exception::class : null,
            'file' => $exception?->getFile(),
            'line' => $exception?->getLine(),
            'trace' => $exception instanceof Throwable ? $exception->getTraceAsString() : null,
        ];

        $this->send(AlertType::CRITICAL_ERROR, $error, $context);
    }

    public function sendQueueFailed(string $job, array $details = []): void
    {
        $this->send(
            AlertType::QUEUE_FAILED,
            "Queue job gefaald: {$job}",
            array_merge(['job' => $job], $details),
        );
    }

    public function sendHighErrorRate(int $errorCount, int $threshold, int $timeWindow): void
    {
        $this->send(
            AlertType::HIGH_ERROR_RATE,
            "Hoge error rate gedetecteerd: {$errorCount} errors in {$timeWindow} minuten (drempel: {$threshold})",
            ['error_count' => $errorCount, 'threshold' => $threshold, 'time_window' => $timeWindow],
        );
    }

    public function sendEmulatorUpdate(string $version, string $details = ''): void
    {
        $this->send(
            AlertType::EMULATOR_UPDATE,
            "Emulator succesvol geüpdatet naar versie {$version}",
            ['version' => $version, 'details' => $details],
            AlertChannel::DISCORD,
        );
    }

    public function sendSqlUpdate(int $count, string $details = ''): void
    {
        $this->send(
            AlertType::SQL_UPDATE,
            "{$count} SQL update(s) succesvol toegepast",
            ['count' => $count, 'details' => $details],
            AlertChannel::DISCORD,
        );
    }

    private function resolveChannels(AlertChannel $preferred): array
    {
        $channels = [];

        if (($preferred === AlertChannel::BOTH || $preferred === AlertChannel::EMAIL) && ($this->emailEnabled && ($this->alertEmail !== '' && $this->alertEmail !== '0'))) {
            $channels[] = AlertChannel::EMAIL;
        }

        if (($preferred === AlertChannel::BOTH || $preferred === AlertChannel::DISCORD) && ($this->discordEnabled && ($this->discordWebhookUrl !== '' && $this->discordWebhookUrl !== '0'))) {
            $channels[] = AlertChannel::DISCORD;
        }

        return $channels;
    }

    private function sendEmail(AlertType $type, string $message, array $context): void
    {
        if (! $this->emailEnabled || ($this->alertEmail === '' || $this->alertEmail === '0')) {
            Log::warning('Email alert skipped: not enabled or no email configured', [
                'emailEnabled' => $this->emailEnabled,
                'alertEmail' => $this->alertEmail,
            ]);

            return;
        }

        try {
            $severity = $type->getSeverity();

            Mail::raw($this->buildEmailBody($type, $message, $context), function ($mail) use ($type, $severity) {
                $mail->from(config('mail.from.address', 'noreply@' . request()->getHost()), $this->siteName)
                    ->to($this->alertEmail)
                    ->subject(sprintf(
                        '[%s] %s - %s',
                        config('app.env', 'Production'),
                        strtoupper($severity->value),
                        $type->getLabel(),
                    ));
            });

            Log::info('Alert email sent successfully', [
                'to' => $this->alertEmail,
                'type' => $type->value,
            ]);
        } catch (\Exception $e) {
            Log::error('Failed to send alert email: ' . $e->getMessage(), [
                'to' => $this->alertEmail,
                'exception' => $e,
            ]);
        }
    }

    private function buildEmailBody(AlertType $type, string $message, array $context): string
    {
        $severity = $type->getSeverity();
        $timestamp = now()->format('Y-m-d H:i:s T');

        $body = "{$severity->getEmoji()} ALERT: {$type->getLabel()}\n";
        $body .= "━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\n\n";
        $body .= "Bericht: {$message}\n";
        $body .= "Tijd: {$timestamp}\n";
        $body .= "Server: {$this->siteName}\n";
        $body .= 'Environment: ' . config('app.env', 'Production') . "\n";
        $body .= 'Severity: ' . ucfirst($severity->value) . "\n\n";

        if ($context !== []) {
            $body .= "Details:\n";
            foreach ($context as $key => $value) {
                if ($key === 'trace' && is_string($value)) {
                    $body .= "  - {$key}: [Zie logs voor volledige trace]\n";
                } else {
                    $body .= "  - {$key}: " . (is_array($value) ? json_encode($value) : (string) $value) . "\n";
                }
            }
        }

        $body .= "\n━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━\n";

        return $body . "Dit is een automatisch gegenereerd bericht van {$this->siteName}.\n";
    }

    private function sendDiscord(AlertType $type, string $message, array $context): void
    {
        if (! $this->discordEnabled || ($this->discordWebhookUrl === '' || $this->discordWebhookUrl === '0')) {
            return;
        }

        try {
            $severity = $type->getSeverity();
            $color = $this->getDiscordColor($severity);

            $embed = [
                'title' => "{$severity->getEmoji()} {$type->getLabel()}",
                'description' => $message,
                'color' => $color,
                'fields' => [
                    [
                        'name' => 'Server',
                        'value' => $this->siteName,
                        'inline' => true,
                    ],
                    [
                        'name' => 'Environment',
                        'value' => config('app.env', 'Production'),
                        'inline' => true,
                    ],
                    [
                        'name' => 'Tijd',
                        'value' => now()->format('Y-m-d H:i:s T'),
                        'inline' => true,
                    ],
                ],
                'footer' => [
                    'text' => 'Atom CMS Alert System',
                ],
                'timestamp' => now()->toIso8601String(),
            ];

            if ($context !== []) {
                $details = [];
                foreach (array_slice($context, 0, 5, true) as $key => $value) {
                    if (in_array($key, ['trace', 'stack_trace'])) {
                        continue;
                    }
                    $details[] = [
                        'name' => ucfirst(str_replace('_', ' ', $key)),
                        'value' => mb_substr((string) (is_array($value) ? json_encode($value) : $value), 0, 1024),
                        'inline' => false,
                    ];
                }
                $embed['fields'] = array_merge($embed['fields'], $details);
            }

            Http::post($this->discordWebhookUrl, [
                'username' => 'Atom CMS Alerts',
                'embeds' => [$embed],
            ]);
        } catch (\Exception $e) {
            Log::error('Failed to send Discord alert: ' . $e->getMessage());
        }
    }

    private function getDiscordColor(AlertSeverity $severity): int
    {
        return match ($severity) {
            AlertSeverity::INFO => 3447003,
            AlertSeverity::WARNING => 16776960,
            AlertSeverity::ERROR => 15158332,
            AlertSeverity::CRITICAL => 10038562,
        };
    }

    private function logAlert(AlertType $type, string $message, array $context = []): void
    {
        try {
            AlertLog::create([
                'type' => $type->value,
                'severity' => $type->getSeverity()->value,
                'message' => $message,
                'context' => $context,
                'sent_via_email' => $this->emailEnabled && ($this->alertEmail !== '' && $this->alertEmail !== '0'),
                'sent_via_discord' => $this->discordEnabled && ($this->discordWebhookUrl !== '' && $this->discordWebhookUrl !== '0'),
            ]);
        } catch (\Exception $e) {
            Log::error('Failed to log alert: ' . $e->getMessage());
        }
    }

    public function testAlert(): array
    {
        Cache::forget('website_settings');
        $this->refreshSettings();

        $results = [];

        if ($this->emailEnabled && ($this->alertEmail !== '' && $this->alertEmail !== '0')) {
            try {
                $this->send(
                    AlertType::EMULATOR_ONLINE,
                    'Dit is een testmelding van het Atom CMS Alert Systeem.',
                    ['test' => true],
                    AlertChannel::EMAIL,
                );
                $results['email'] = 'success';
            } catch (\Exception $e) {
                $results['email'] = 'failed: ' . $e->getMessage();
            }
        }

        if ($this->discordEnabled && ($this->discordWebhookUrl !== '' && $this->discordWebhookUrl !== '0')) {
            try {
                $this->send(
                    AlertType::EMULATOR_ONLINE,
                    'Dit is een testmelding van het Atom CMS Alert Systeem.',
                    ['test' => true],
                    AlertChannel::DISCORD,
                );
                $results['discord'] = 'success';
            } catch (\Exception $e) {
                $results['discord'] = 'failed: ' . $e->getMessage();
            }
        }

        return $results;
    }

    private function refreshSettings(): void
    {
        $this->emailEnabled = (bool) setting('alert_email_enabled', false);
        $this->discordEnabled = (bool) setting('alert_discord_enabled', false);
        $this->discordWebhookUrl = setting('alert_discord_webhook_url', '');
        $this->alertEmail = setting('alert_email_address', '');
    }

    public static function clearCache(): void
    {
        Cache::forget('alert_settings');
    }
}