<?php

declare(strict_types=1);

namespace App\Services;

use App\Models\Miscellaneous\WebsiteSetting;
use Carbon\Carbon;
use Illuminate\Http\Client\Response;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Http;

readonly class StreamMonitoringService
{
    private const string CACHE_KEY = 'radio_stream_status';

    private const int CACHE_DURATION_MINUTES = 1;

    private const string SETTINGS_CACHE_KEY = 'radio_monitor_settings';

    private const int SETTINGS_CACHE_DURATION = 60;

    private string $streamUrl;

    private int $timeout;

    public function __construct()
    {
        $settings = $this->getSettings();
        $this->streamUrl = $settings['radio_stream_url'] ?? '';
        $this->timeout = (int) ($settings['radio_monitoring_timeout'] ?? 5);
    }

    public function getStatus(): array
    {
        return Cache::remember(self::CACHE_KEY, now()->addMinutes(self::CACHE_DURATION_MINUTES), fn (): array => $this->fetchStatus());
    }

    private function fetchStatus(): array
    {
        $status = [
            'online' => false,
            'listeners' => 0,
            'bitrate' => 0,
            'format' => null,
            'server_type' => null,
            'last_check' => now()->toIso8601String(),
            'error' => null,
        ];

        if ($this->streamUrl === '') {
            $status['error'] = 'No stream URL configured';

            return $status;
        }

        try {
            $response = Http::timeout($this->timeout)
                ->withOptions([
                    'verify' => false,
                    'allow_redirects' => true,
                ])
                ->head($this->streamUrl);

            if ($response->successful()) {
                $status['online'] = true;
                $status['listeners'] = $this->extractListeners($response);
                $status['bitrate'] = $this->extractBitrate($response);
                $status['format'] = $this->extractFormat($response);
                $status['server_type'] = $this->detectServerType($response);
            } else {
                $status['error'] = 'Stream returned status: ' . $response->status();
            }
        } catch (\Exception $e) {
            $status['error'] = $e->getMessage();
        }

        return $status;
    }

    private function extractListeners(Response $response): int
    {
        $headers = [
            'x-listeners',
            'x-audiocast-listeners',
            'icecast-listeners',
            'listeners',
        ];

        foreach ($headers as $header) {
            $value = $response->header($header);
            if ($value !== null && is_numeric($value)) {
                return (int) $value;
            }
        }

        return 0;
    }

    private function extractBitrate(Response $response): int
    {
        $headers = ['x-bitrate', 'bitrate'];

        foreach ($headers as $header) {
            $value = $response->header($header);
            if ($value !== null && is_numeric($value)) {
                return (int) $value;
            }
        }

        return 0;
    }

    private function extractFormat(Response $response): ?string
    {
        $contentType = $response->header('content-type');

        if ($contentType === null) {
            return null;
        }

        return match (true) {
            str_contains($contentType, 'mp3') => 'MP3',
            str_contains($contentType, 'ogg') => 'OGG',
            str_contains($contentType, 'aac') => 'AAC',
            default => null,
        };
    }

    private function detectServerType(Response $response): ?string
    {
        $server = $response->header('server');

        if ($server !== null) {
            $serverLower = strtolower($server);

            return match (true) {
                str_contains($serverLower, 'icecast') => 'Icecast',
                str_contains($serverLower, 'shoutcast') => 'Shoutcast',
                str_contains($serverLower, 'azurecast') => 'AzureCast',
                default => null,
            };
        }

        $headers = $response->headers();

        return isset($headers['x-audiocast-server']) ? 'AzureCast' : null;
    }

    public function getUptime(): array
    {
        $uptime = $this->getSetting('radio_last_online');

        if ($uptime === null) {
            return [
                'was_ever_online' => false,
                'last_online' => null,
                'uptime_percentage' => 0,
            ];
        }

        $lastOnline = Carbon::parse($uptime);
        $now = now();
        $diff = $lastOnline->diff($now);

        $totalMinutes = $diff->days * 24 * 60 + $diff->h * 60 + $diff->i;

        return [
            'was_ever_online' => true,
            'last_online' => $lastOnline->toIso8601String(),
            'downtime_minutes' => $totalMinutes,
            'last_online_human' => $lastOnline->diffForHumans(),
        ];
    }

    public function recordOnlineStatus(bool $isOnline): void
    {
        if ($isOnline) {
            WebsiteSetting::updateOrCreate(
                ['key' => 'radio_last_online'],
                ['value' => now()->toIso8601String()],
            );

            $this->incrementStat('radio_total_online_minutes');
        }

        $this->incrementStat('radio_total_checks');
    }

    private function incrementStat(string $key): void
    {
        $current = (int) ($this->getSetting($key) ?? 0);
        WebsiteSetting::updateOrCreate(
            ['key' => $key],
            ['value' => (string) ($current + 1)],
        );
    }

    public function getStats(): array
    {
        $totalChecks = (int) ($this->getSetting('radio_total_checks') ?? 0);
        $totalOnlineMinutes = (int) ($this->getSetting('radio_total_online_minutes') ?? 0);

        $uptimePercentage = $totalChecks > 0 ? round(($totalOnlineMinutes / max($totalChecks, 1)) * 100, 2) : 0;

        return [
            'current_status' => $this->getStatus(),
            'uptime' => $this->getUptime(),
            'total_checks' => $totalChecks,
            'total_online_minutes' => $totalOnlineMinutes,
            'uptime_percentage' => $uptimePercentage,
        ];
    }

    private function getSetting(string $key): ?string
    {
        return $this->getSettings()[$key] ?? null;
    }

    /**
     * @return array<string, string|null>
     */
    private function getSettings(): array
    {
        return Cache::remember(self::SETTINGS_CACHE_KEY, self::SETTINGS_CACHE_DURATION, fn (): array => WebsiteSetting::whereIn('key', [
            'radio_stream_url',
            'radio_monitoring_timeout',
            'radio_last_online',
            'radio_total_checks',
            'radio_total_online_minutes',
        ])->pluck('value', 'key')->toArray());
    }
}