<?php

namespace App\Services;

use Illuminate\Database\Query\Builder;
use Illuminate\Support\Facades\Crypt;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Validator;
use Illuminate\Validation\ValidationException;
use RuntimeException;
use Telegram\Bot\Api;
use Telegram\Bot\Exceptions\TelegramResponseException;
use Telegram\Bot\FileUpload\InputFile;

class TelegramChannelService
{
    public const LEGACY_FIELD = 'channel_message';
    public const VIEW = 'admin/telegramChannel/list';
    public const MANAGE = 'admin/telegramChannel/save';
    public const PUBLISH = 'admin/telegramChannel/publish';

    public function list(): array
    {
        return $this->joinedChannels()->orderBy('channels.id')
            ->get()
            ->map(fn ($row) => $this->present($row, (int) $row->default_channel_id === (int) $row->id))
            ->all();
    }

    public function detail(int $id): array
    {
        $row = $this->find($id);
        return $this->present($row, (int) $row->default_channel_id === $id, true);
    }

    public function save(#[\SensitiveParameter] array $input, bool $legacy = false): array
    {
        if (is_string($input['name'] ?? null)) {
            $input['name'] = trim($input['name']);
            if ($input['name'] === '') {
                $input['name'] = null;
            }
        }
        $hasMessage = array_intersect(['type', 'text', 'image', 'video', 'button'], array_keys($input)) !== [];
        $fields = Validator::make($input, [
            'id' => $legacy ? 'prohibited' : 'sometimes|required|integer|min:1',
            'name' => 'nullable|string|max:255',
            'chatId' => 'required|string|max:64',
            'bot_id' => 'sometimes|nullable|integer|min:1|prohibits:bot_token',
            'bot_username' => ['nullable', 'string', 'max:64', 'regex:/^@?[a-z][a-z0-9_]*$/iD'],
            'bot_token' => ['nullable', 'string', 'max:255', 'regex:/^[1-9][0-9]*:[a-z0-9_-]+$/iD'],
            'enabled' => 'sometimes|required|boolean',
            'type' => [($legacy || $hasMessage) ? 'required' : 'sometimes', 'string', 'in:text,image,video'],
        ], [], ['name' => '频道名称'])->validate();

        $target = self::normalizeTarget($fields['chatId']);
        if ($target === null) {
            throw ValidationException::withMessages(['chatId' => '请输入频道用户名或负数频道 ID']);
        }
        $message = isset($fields['type']) ? self::message($input) : null;
        $row = isset($fields['id']) && !$legacy ? $this->find((int) $fields['id']) : null;
        if ($legacy) {
            $row = $this->joinedChannels()->where(fn (Builder $query) => $query
                ->where('channels.target', $target)->orWhere('channels.telegram_chat_id', $target))->first();
        }
        $newToken = $fields['bot_token'] ?? null;
        $botId = array_key_exists('bot_id', $fields) ? $fields['bot_id'] : $row?->bot_id;
        $selectedBot = $botId === null ? null : $this->findBot((int) $botId);
        $bot = $newToken === null ? [] : $this->validateBot($fields['bot_username'] ?? null, $newToken);
        if ($newToken === null && isset($fields['bot_username'])
            && strcasecmp(ltrim($fields['bot_username'], '@'), $selectedBot->bot_username ?? '') !== 0) {
            throw ValidationException::withMessages(['bot_username' => '请从机器人管理中选择机器人']);
        }

        $targetUnchanged = $row !== null && in_array($target, [$row->target, $row->telegram_chat_id], true);
        $bindingUnchanged = (int) $botId === (int) $row?->bot_id && $newToken === null;
        $identity = $targetUnchanged && $bindingUnchanged
            ? ['target' => $row->target, 'telegram_chat_id' => $row->telegram_chat_id, 'title' => $row->name]
            : $this->resolve($target, $newToken ?? $this->storedToken($selectedBot));

        return DB::transaction(function () use ($fields, $identity, $message, $legacy, $row, $bot, $selectedBot) {
            $default = $this->settings()->lockForUpdate()->first();
            $channels = DB::table('telegram_channels');
            $existing = $row === null ? null : (clone $channels)->where('id', $row->id)->first();
            if ($row !== null && ($existing === null || $existing->target !== $row->target
                || $existing->telegram_chat_id !== $row->telegram_chat_id || $existing->bot_id !== $row->bot_id)) {
                throw ValidationException::withMessages(['id' => '频道已变更，请刷新后重试']);
            }

            $match = (clone $channels)->where(function (Builder $query) use ($identity) {
                $query->where('target', $identity['target']);
                if ($identity['telegram_chat_id'] !== null) {
                    $query->orWhere('telegram_chat_id', $identity['telegram_chat_id']);
                }
            })->get();
            if ($legacy && $row === null && $match->count() === 1) {
                $existing = $match->first();
                if ($existing->bot_id !== null && $bot === [] && !array_key_exists('bot_id', $fields)) {
                    throw ValidationException::withMessages(['chatId' => '请使用已保存的频道标识，或通过频道管理按 ID 编辑']);
                }
            }
            if ($match->contains(fn ($channel) => (int) $channel->id !== (int) $existing?->id)) {
                throw ValidationException::withMessages(['chatId' => '该频道已存在']);
            }

            if ($selectedBot !== null && $this->findBot((int) $selectedBot->id)->bot_token !== $selectedBot->bot_token) {
                throw ValidationException::withMessages(['bot_id' => '机器人配置已更新，请刷新后重试']);
            }
            $binding = $selectedBot?->id;
            if ($bot !== []) {
                $registered = DB::table('telegram_bots')->where('bot_username', $bot['bot_username'])->first();
                if ($registered !== null && $this->storedToken($registered) !== $this->storedToken((object) $bot)) {
                    throw ValidationException::withMessages(['bot_token' => '请在机器人管理中更新已有机器人的 Token']);
                }
                $binding = $registered?->id ?? DB::table('telegram_bots')->insertGetId($bot + [
                    'created_at' => now(), 'updated_at' => now(),
                ]);
            }

            $enabled = (bool) ($fields['enabled'] ?? $existing?->enabled ?? true);
            $values = [
                'name' => $fields['name'] ?? $existing?->name ?? $identity['title'],
                'target' => $identity['target'],
                'telegram_chat_id' => $identity['telegram_chat_id'],
                'enabled' => $enabled,
                'message' => $message === null
                    ? ($existing?->message ?? 'null')
                    : json_encode($message, JSON_THROW_ON_ERROR | JSON_UNESCAPED_UNICODE),
                'bot_id' => $binding,
                'updated_at' => now(),
            ];
            if ($existing === null) {
                $firstLegacy = $legacy && !$channels->exists();
                $id = (int) $channels->insertGetId($values + ['created_at' => now()]);
                if ($firstLegacy && $enabled) {
                    $this->settings()->update(['default_channel_id' => $id]);
                }
            } else {
                $id = (int) $existing->id;
                $channels->where('id', $id)->update($values);
                if (!$enabled && (int) $default->default_channel_id === $id) {
                    $this->settings()->update(['default_channel_id' => null]);
                }
            }

            return $this->detail($id);
        }, 3);
    }

    public function setDefault(int $id): array
    {
        return DB::transaction(function () use ($id) {
            $this->settings()->lockForUpdate()->first();
            $row = $this->find($id);
            if (!$row->enabled) {
                throw ValidationException::withMessages(['id' => '请先启用频道']);
            }
            $this->settings()->update(['default_channel_id' => $id]);
            return $this->detail($id);
        }, 3);
    }

    public function delete(int $id): void
    {
        DB::transaction(function () use ($id) {
            $default = $this->settings()->lockForUpdate()->first();
            $this->find($id);
            if ((int) $default->default_channel_id === $id) {
                $this->settings()->update(['default_channel_id' => null]);
            }
            DB::table('telegram_channels')->where('id', $id)->delete();
        }, 3);
    }

    public function legacyMessage(): ?array
    {
        $row = $this->defaultChannel();
        return $row === null ? null : ['chatId' => ltrim($row->target, '@')] + $this->storedMessage($row);
    }

    public function roomNoticeTarget(): ?string
    {
        $row = $this->defaultChannel();
        return $row === null ? null : ($row->telegram_chat_id ?? $row->target);
    }

    public function publish(int $id, bool $pin): array
    {
        $row = $this->find($id);
        return $this->publishContent($row, $this->storedMessage($row), $pin);
    }

    public function publishMessage(int $id, array $message, bool $pin, string $target): array
    {
        $row = $this->find($id);
        if (($row->telegram_chat_id ?? $row->target) !== $target) {
            throw ValidationException::withMessages(['channel_id' => '频道标识已变更，请重新创建发送记录']);
        }
        return $this->publishContent($row, $message, $pin);
    }

    private function publishContent(object $row, array $message, bool $pin): array
    {
        $channel = $this->present($row, false) + $message;
        if (!$channel['enabled']) {
            throw ValidationException::withMessages(['id' => '请先启用频道']);
        }

        if ($channel['type'] === null) {
            throw ValidationException::withMessages(['type' => '请先保存要发布的消息']);
        }

        $params = ['chat_id' => $channel['telegram_chat_id'] ?? $channel['chatId']];
        if ($channel['button'] !== []) {
            $params['reply_markup'] = json_encode(['inline_keyboard' => $channel['button']], JSON_THROW_ON_ERROR);
        }

        try {
            $telegram = $this->telegram($this->storedToken($row));
            $response = $this->send($telegram, $channel, $params);
        } catch (TelegramResponseException $exception) {
            if (($exception->getHttpStatusCode() ?? 500) < 500) {
                return ['sent' => false, 'pinned' => null, 'message_id' => null, 'error' => 'Telegram 拒绝发布，请检查机器人发帖权限、频道和消息内容'];
            }
            return ['sent' => null, 'pinned' => null, 'message_id' => null, 'error' => '未能确认发布结果，请先检查频道'];
        } catch (\Exception) {
            return ['sent' => null, 'pinned' => null, 'message_id' => null, 'error' => '未能确认发布结果，请先检查频道'];
        }

        $messageId = $response['message_id'] ?? null;
        if ($messageId === null) {
            return ['sent' => null, 'pinned' => null, 'message_id' => null, 'error' => '未能确认发布结果，请先检查频道'];
        }

        $pinned = null;
        $error = null;
        if ($pin) {
            try {
                $pinned = $telegram->pinChatMessage(['chat_id' => $params['chat_id'], 'message_id' => $messageId]);
                if (!$pinned) {
                    $error = '消息已发布，置顶未成功';
                }
            } catch (\Exception) {
                $pinned = false;
                $error = '消息已发布，请在频道中检查置顶状态';
            }
        }

        return ['sent' => true, 'pinned' => $pinned, 'message_id' => $messageId, 'error' => $error];
    }

    private function send(Api $telegram, array $channel, array $params): array
    {
        if ($channel['type'] === 'text') {
            return $telegram->post('sendMessage', $params + ['text' => $channel['text']])->getResult() ?: [];
        }

        $image = $channel['type'] === 'image';
        $media = $channel[$channel['type']];
        $field = $image ? 'photo' : 'video';
        $params['caption'] = $channel['text'];

        // Only read files produced by the admin upload endpoints on the configured public disk.
        $disk = Storage::disk('public');
        $prefix = rtrim($disk->url(''), '/') . '/';
        $path = str_starts_with($media, $prefix) ? substr($media, strlen($prefix)) : '';
        if (preg_match('~\A(?:images|videos)/[a-f0-9]{32}\.(?:jpg|jpeg|png|webp|mp4|mov|avi|webm)\z~i', $path) && $disk->exists($path)) {
            $stream = $disk->readStream($path);
            if (!is_resource($stream)) {
                throw new RuntimeException('Unable to read uploaded media');
            }
            try {
                $params[$field] = InputFile::create($stream, basename($path));
                $response = $image ? $telegram->sendPhoto($params) : $telegram->sendVideo($params);
                return ['message_id' => $response->get('message_id')];
            } finally {
                if (is_resource($stream)) {
                    fclose($stream);
                }
            }
        }

        // Telegram fetches external media directly.
        return $telegram->post($image ? 'sendPhoto' : 'sendVideo', $params + [$field => $media])->getResult() ?: [];
    }

    public function bots(): array
    {
        return DB::table('telegram_bots')->orderBy('bot_username')
            ->get(['id', 'bot_username', 'bot_name'])->all();
    }

    public function saveBot(#[\SensitiveParameter] array $input): array
    {
        $fields = Validator::make($input, [
            'id' => 'sometimes|required|integer|min:1',
            'bot_username' => ['nullable', 'string', 'max:64', 'regex:/^@?[a-z][a-z0-9_]*$/iD'],
            'bot_token' => ['required', 'string', 'max:255', 'regex:/^[1-9][0-9]*:[a-z0-9_-]+$/iD'],
        ])->validate();
        $id = isset($fields['id']) ? (int) $fields['id'] : null;
        $row = $id === null ? null : $this->findBot($id);
        $bot = $this->validateBot($fields['bot_username'] ?? $row?->bot_username, $fields['bot_token']);
        if ($row !== null && strcasecmp($row->bot_username, $bot['bot_username']) !== 0) {
            throw ValidationException::withMessages(['bot_username' => '请使用此机器人的 Token，更换机器人请新增后再绑定']);
        }

        return DB::transaction(function () use ($id, $row, $bot) {
            $this->settings()->lockForUpdate()->first();
            $bots = DB::table('telegram_bots');
            $duplicate = (clone $bots)->where('bot_username', $bot['bot_username'])->value('id');
            if ($duplicate !== null && (int) $duplicate !== $id) {
                throw ValidationException::withMessages(['bot_username' => '该机器人已存在']);
            }
            $values = $bot + ['updated_at' => now()];
            if ($id === null) {
                $id = (int) $bots->insertGetId($values + ['created_at' => now()]);
            } else {
                if ($this->findBot($id)->bot_token !== $row->bot_token) {
                    throw ValidationException::withMessages(['id' => '机器人已更新，请刷新后重试']);
                }
                $bots->where('id', $id)->update($values);
            }
            return ['id' => $id, 'bot_username' => $bot['bot_username'], 'bot_name' => $bot['bot_name']];
        }, 3);
    }

    public function deleteBot(int $id): void
    {
        DB::transaction(function () use ($id) {
            $this->settings()->lockForUpdate()->first();
            $this->findBot($id);
            if (DB::table('telegram_channels')->where('bot_id', $id)->exists()) {
                throw ValidationException::withMessages(['id' => '机器人仍绑定频道，请先在频道中解除绑定']);
            }
            DB::table('telegram_bots')->where('id', $id)->delete();
        }, 3);
    }

    public function privateMenu(int $id, string $language): array
    {
        $menus = json_decode($this->findBot($id)->private_menus ?? '{}', true);
        return $menus[$language] ?? ['reply' => '', 'buttons' => []];
    }

    public function savePrivateMenu(int $id, string $language, array $input): array
    {
        $menu = Validator::make($input, [
            'reply' => 'required|string|max:4096',
            'buttons' => 'present|array|list|max:20',
            'buttons.*' => 'required|array|list|max:8',
            'buttons.*.*' => 'required|string|max:128',
        ])->validate();

        return DB::transaction(function () use ($id, $language, $menu) {
            $bot = DB::table('telegram_bots')->where('id', $id)->lockForUpdate()->first()
                ?? throw ValidationException::withMessages(['id' => '机器人不存在']);
            $menus = json_decode($bot->private_menus ?? '{}', true);
            $menus[$language] = $menu;
            DB::table('telegram_bots')->where('id', $id)->update([
                'private_menus' => json_encode($menus, JSON_THROW_ON_ERROR | JSON_UNESCAPED_UNICODE),
                'updated_at' => now(),
            ]);
            return $menu;
        }, 3);
    }

    public function registerPrivateWebhook(int $id): array
    {
        $bot = $this->findBot($id);
        $token = $this->storedToken($bot);
        if ($token === config('services.telegram.token')) {
            return ['system_bot' => true];
        }

        $secret = $bot->webhook_secret;
        if ($secret === null) {
            DB::table('telegram_bots')->where('id', $id)->whereNull('webhook_secret')
                ->update(['webhook_secret' => bin2hex(random_bytes(32))]);
            $bot = $this->findBot($id);
            $secret = $bot->webhook_secret;
        }
        $webhookUrl = rtrim((string) config('app.url'), '/') . '/api/telegramBot/' . $id . '/webhook';
        try {
            $telegram = $this->telegram($token);
            $existingUrl = (string) $telegram->getWebhookInfo()->get('url');
        } catch (\Exception) {
            throw ValidationException::withMessages(['id' => '无法读取 Telegram 接入状态，请检查 Bot Token']);
        }
        if ($existingUrl !== '' && $existingUrl !== $webhookUrl) {
            throw ValidationException::withMessages(['id' => '机器人已接入其他 Webhook，请确认停用原接入后重试']);
        }
        try {
            $registered = $telegram->setWebhook([
                'url' => $webhookUrl,
                'secret_token' => $secret,
                'allowed_updates' => ['message'],
            ]);
        } catch (\Exception) {
            $registered = false;
        }
        if (!$registered) {
            throw ValidationException::withMessages(['id' => '无法接入 Telegram，请检查 Bot Token 和站点 HTTPS 配置']);
        }
        return ['system_bot' => false];
    }

    public function handlePrivateWebhook(int $id, string $secret, array $update): void
    {
        $bot = DB::table('telegram_bots')->where('id', $id)->first();
        abort_unless($bot?->webhook_secret && hash_equals($bot->webhook_secret, $secret), 404);
        if (is_int($update['update_id'] ?? null)) {
            rescue(fn () => Log::channel('telegram_webhook')->info('Telegram 收到更新', ['bot_id' => $id, 'update' => $update]));
        }

        $message = $update['message'] ?? [];
        $chatId = $message['chat']['id'] ?? null;
        if (($message['chat']['type'] ?? null) !== 'private' || !is_int($chatId)
            || !is_string($message['text'] ?? null) || !preg_match('/^\/start(?:\s|$)/D', $message['text'])) {
            return;
        }

        $language = strtolower(substr((string) ($message['from']['language_code'] ?? ''), 0, 2));
        $menu = $this->configuredPrivateMenu($bot, $language);
        if ($menu === null) {
            return;
        }
        try {
            $this->sendPrivateMenu($this->telegram($this->storedToken($bot)), $chatId, $menu);
        } catch (\Exception) {
            Log::warning('Telegram 私聊菜单发送失败', ['bot_id' => $id]);
            abort(503);
        }
    }

    public function sendSystemPrivateMenu($chatId, string $language): bool
    {
        $token = config('services.telegram.token');
        if (!$token) {
            return false;
        }

        foreach (DB::table('telegram_bots')->whereNotNull('private_menus')->cursor() as $bot) {
            if ($token === $this->storedToken($bot) && ($menu = $this->configuredPrivateMenu($bot, $language)) !== null) {
                $this->sendPrivateMenu($this->telegram(null), $chatId, $menu);
                return true;
            }
        }
        return false;
    }

    private function configuredPrivateMenu(object $bot, string $language): ?array
    {
        $menus = json_decode($bot->private_menus ?? '{}', true);
        return $menus[$language] ?? $menus['en'] ?? $menus['zh'] ?? ($menus['vi'] ?? null);
    }

    private function sendPrivateMenu(Api $telegram, $chatId, array $menu): void
    {
        $keyboard = $menu['buttons'] === []
            ? ['remove_keyboard' => true]
            : ['keyboard' => $menu['buttons'], 'resize_keyboard' => true];
        $telegram->sendMessage([
            'chat_id' => $chatId,
            'text' => $menu['reply'],
            'reply_markup' => json_encode($keyboard, JSON_THROW_ON_ERROR | JSON_UNESCAPED_UNICODE),
        ]);
    }

    private function findBot(int $id): object
    {
        return DB::table('telegram_bots')->where('id', $id)->first()
            ?? throw ValidationException::withMessages(['bot_id' => '机器人不存在']);
    }

    private function validateBot(?string $username, #[\SensitiveParameter] string $token): array
    {
        try {
            $bot = $this->telegram($token)->getMe();
        } catch (\Exception) {
            throw ValidationException::withMessages(['bot_token' => '无法验证 Bot Token，请检查 Token 或 Telegram 连接']);
        }

        $actualUsername = $bot->get('username');
        if (!$bot->get('is_bot') || !is_string($actualUsername) || $actualUsername === '') {
            throw ValidationException::withMessages(['bot_token' => 'Bot Token 未返回有效的机器人账号']);
        }
        if ($username !== null && strcasecmp(ltrim($username, '@'), $actualUsername) !== 0) {
            throw ValidationException::withMessages(['bot_username' => '机器人用户名和 Bot Token 不匹配']);
        }

        return [
            'bot_username' => strtolower($actualUsername),
            'bot_name' => mb_substr((string) $bot->get('first_name'), 0, 255),
            'bot_token' => Crypt::encryptString($token),
        ];
    }

    private function storedToken(?object $row): ?string
    {
        return $row?->bot_token === null ? null : Crypt::decryptString($row->bot_token);
    }

    protected function telegram(#[\SensitiveParameter] ?string $token): Api
    {
        return $token === null ? app(Api::class) : new Api($token);
    }

    private function resolve(string $target, #[\SensitiveParameter] ?string $token): array
    {
        if ($token === null && !config('services.telegram.token')) {
            throw ValidationException::withMessages(['bot_id' => '系统机器人尚未配置，请选择已添加的机器人']);
        }
        try {
            $chat = $this->telegram($token)->getChat(['chat_id' => $target]);
        } catch (\Exception) {
            $bot = $token === null ? '系统机器人' : '所选机器人';
            throw ValidationException::withMessages(['chatId' => "无法读取频道，请检查频道标识，并确认{$bot}已加入目标频道"]);
        }
        $id = (string) $chat->get('id');
        if ($chat->get('type') !== 'channel' || !preg_match('/^-[1-9]\d{1,19}$/D', $id)) {
            throw ValidationException::withMessages(['chatId' => '请输入 Telegram 频道，群组和私聊无法使用']);
        }
        $username = $chat->get('username');
        return [
            'target' => $username ? self::normalizeTarget($username) ?? $id : $id,
            'telegram_chat_id' => $id,
            'title' => mb_substr((string) ($chat->get('title') ?: $target), 0, 255),
        ];
    }

    public static function legacyChannel(mixed $value): ?array
    {
        if (!is_array($value) || ($target = self::normalizeTarget($value['chatId'] ?? null)) === null) {
            return null;
        }
        $value['type'] ??= !empty($value['video']) ? 'video' : (!empty($value['image']) ? 'image' : 'text');
        try {
            $message = self::message($value);
        } catch (ValidationException) {
            return null;
        }
        return [
            'name' => ltrim($target, '@'),
            'target' => $target,
            'telegram_chat_id' => str_starts_with($target, '-') ? $target : null,
            'enabled' => true,
            'message' => json_encode($message, JSON_THROW_ON_ERROR | JSON_UNESCAPED_UNICODE),
        ];
    }

    private static function normalizeTarget(mixed $value): ?string
    {
        if (!is_string($value)) {
            return null;
        }
        $value = trim($value);
        if (preg_match('/^-[1-9]\d{1,19}$/D', $value)) {
            return $value;
        }
        return preg_match('/^@?[a-z][a-z0-9_]{3,31}$/iD', $value) ? '@' . strtolower(ltrim($value, '@')) : null;
    }

    public static function message(array $input): array
    {
        $data = Validator::make($input, [
            'type' => 'required|in:text,image,video',
            'text' => 'nullable|required_if:type,text|string|max:' . (($input['type'] ?? null) === 'text' ? 4096 : 1024),
            'image' => 'nullable|required_if:type,image|string|max:2048|url:http,https',
            'video' => 'nullable|required_if:type,video|string|max:2048|url:http,https',
            'button' => 'sometimes|array|list',
            'button.*' => 'required|array|list',
            'button.*.*' => 'required|array',
            'button.*.*.text' => 'required|string',
            'button.*.*.url' => 'required|string|url:http,https,tg',
        ])->validate();

        foreach (['image', 'video'] as $field) {
            $url = $data[$field] ?? '';
            $host = rtrim(strtolower(trim(parse_url($url, PHP_URL_HOST) ?? '', '[]')), '.');
            if ($url !== '' && (
                parse_url($url, PHP_URL_USER) !== null
                || $host === 'localhost'
                || str_ends_with($host, '.localhost')
                || (filter_var($host, FILTER_VALIDATE_IP) && !filter_var($host, FILTER_VALIDATE_IP, FILTER_FLAG_GLOBAL_RANGE))
                || str_contains(strtolower(rawurldecode(parse_url($url, PHP_URL_PATH) ?? '')), '/_ignition/')
            )) {
                throw ValidationException::withMessages([$field => '媒体地址须可公开访问']);
            }
        }

        return [
            'type' => $data['type'],
            'text' => $data['text'] ?? '',
            'image' => $data['image'] ?? '',
            'video' => $data['video'] ?? '',
            'button' => array_map(fn ($row) => array_map(
                fn ($button) => ['text' => $button['text'], 'url' => $button['url']],
                $row,
            ), $data['button'] ?? []),
        ];
    }

    private function settings(): Builder
    {
        return DB::table('telegram_channel_settings')->where('id', 1);
    }

    private function defaultChannel(): ?object
    {
        return $this->joinedChannels()->where('channels.enabled', true)
            ->whereColumn('channels.id', 'settings.default_channel_id')->first();
    }

    private function find(int $id): object
    {
        return $this->joinedChannels()->where('channels.id', $id)->first()
            ?? throw ValidationException::withMessages(['id' => '频道不存在']);
    }

    private function joinedChannels(): Builder
    {
        return DB::table('telegram_channels as channels')
            ->crossJoin('telegram_channel_settings as settings')
            ->leftJoin('telegram_bots as bots', 'bots.id', '=', 'channels.bot_id')
            ->select('channels.id', 'channels.name', 'channels.target', 'channels.telegram_chat_id', 'channels.enabled', 'channels.message', 'channels.bot_id', 'settings.default_channel_id', 'bots.bot_username', 'bots.bot_name', 'bots.bot_token')
            ->where('settings.id', 1);
    }

    private function present(object $row, bool $default, bool $withMessage = false): array
    {
        $data = [
            'id' => (int) $row->id,
            'name' => $row->name,
            'chatId' => $row->target,
            'telegram_chat_id' => $row->telegram_chat_id,
            'bot_id' => $row->bot_id === null ? null : (int) $row->bot_id,
            'bot_username' => $row->bot_username,
            'bot_name' => $row->bot_name,
            'has_bot_token' => $row->bot_token !== null,
            'enabled' => (bool) $row->enabled,
            'is_default' => $default,
        ];
        return $withMessage ? $data + $this->storedMessage($row) : $data;
    }

    private function storedMessage(object $row): array
    {
        return json_decode($row->message, true) ?? [
            'type' => null,
            'text' => '',
            'image' => '',
            'video' => '',
            'button' => [],
        ];
    }
}