<?php

/*
 * Copyright (c) 2025, Антон Аксенов
 * This file is part of m3u.su project
 * MIT License: https://git.axenov.dev/IPTV/web/src/branch/master/LICENSE
 */

declare(strict_types=1);

namespace App\Core;

use Exception;

/**
 * Обработчик команд бота
 */
class StatisticsService
{
    /**
     * @var array[]
     */
    protected array $playlists = [];

    protected array $channels = [];

    public function __construct()
    {
        $this->playlists = ini()->getPlaylists();
        $this->channels = $this->getAllChannels();
    }

    /**
     * Обрабатывает команду /stats
     *
     * @return bool
     * @throws Exception
     */
    public function get(): array
    {
        return [
            'playlists' => [
                'all' => count($this->playlists),
                'online' => count($this->getPlaylistsByField('isOnline', true)),
                'offline' => count($this->getPlaylistsByField('isOnline', false)),
                'unknown' => count($this->getPlaylistsByField('isOnline', null)),
                'adult' => count($this->getPlaylistsByTag('adult')),
                'hasCatchup' => count($this->getPlaylistsByField('hasCatchup', true)),
                'hasTvg' => count($this->getPlaylistsByField('hasTvg', true)),
                'groupped' => count($this->getPlaylistsWithGroups()),
                'latest' => $this->getLatestPlaylist(),
            ],
            'channels' => [
                'all' => $this->getAllChannelsCount(),
                'online' => count($this->getChannelsByField('isOnline', true)),
                'offline' => count($this->getChannelsByField('isOnline', false)),
                'adult' => count($this->getChannelsByTag('adult')),
            ],
        ];
    }

    protected function getPlaylistsByField(string $field, bool|int|string|null $value): array
    {
        return array_filter(
            $this->playlists,
            static fn (array $pls) => $pls[$field] === $value,
        );
    }

    protected function getPlaylistsByTag(string $tag): array
    {
        return array_filter(
            $this->playlists,
            static fn (array $pls) => in_array($tag, $pls['tags']),
        );
    }

    protected function getPlaylistsWithGroups(): array
    {
        return array_filter(
            $this->playlists,
            static fn (array $pls) => !empty($pls['groups']),
        );
    }

    protected function getLatestPlaylist(): array
    {
        $e = array_combine(
            array_column($this->playlists, 'code'),
            array_column($this->playlists, 'checkedAt'),
        );
        $e = array_filter($e);
        asort($e);
        $latest = array_slice($e, 0, 1);

        return [
            'code' => array_first(array_keys($latest)),
            'time' => $time = array_first($latest),
            'timeFmt' => date('H:i:s d.m.Y', $time),
        ];
    }

    protected function getAllChannels(): array
    {
        $channels = [];
        foreach ($this->playlists as $pls) {
            $channels = array_merge($channels, $pls['channels']);
        }

        return $channels;
    }

    protected function getAllChannelsCount(): int
    {
        return count($this->channels);
    }

    protected function getChannelsByField(string $field, bool|int|string|null $value): array
    {
        return array_filter(
            $this->channels,
            static fn (array $channel) => $channel[$field] === $value,
        );
    }

    protected function getChannelsByTag(string $tag): array
    {
        return array_filter(
            $this->channels,
            static fn (array $channel) => in_array($tag, $channel['tags']),
        );
    }
}