import db from './sqlite';

interface TelegramNotificationConfig {
  id: number;
  name: string;
  botToken: string;
  chatId: string;
  notificationTypes: string[];
  isEnabled: boolean;
}

interface TransactionNotificationData {
  id: number;
  type: string;
  amount: number;
  currency: string;
  categoryName?: string;
  accountName?: string;
  transactionDate: string;
  description?: string;
  status: string;
}

/**
 * 获取所有启用的Telegram通知配置
 */
export function getEnabledNotificationConfigs(
  notificationType: string = 'transaction',
): TelegramNotificationConfig[] {
  const rows = db
    .prepare<{ id: number; name: string; bot_token: string; chat_id: string; notification_types: string; is_enabled: number }>(
      `
      SELECT id, name, bot_token, chat_id, notification_types, is_enabled
      FROM telegram_notification_configs
      WHERE is_enabled = 1
    `,
    )
    .all();

  return rows
    .map((row) => ({
      id: row.id,
      name: row.name,
      botToken: row.bot_token,
      chatId: row.chat_id,
      notificationTypes: JSON.parse(row.notification_types) as string[],
      isEnabled: row.is_enabled === 1,
    }))
    .filter((config) => config.notificationTypes.includes(notificationType));
}

/**
 * 格式化交易金额
 */
function formatAmount(amount: number, currency: string): string {
  const formatted = amount.toLocaleString('zh-CN', {
    minimumFractionDigits: 2,
    maximumFractionDigits: 2,
  });
  return `${currency} ${formatted}`;
}

/**
 * 格式化交易类型
 */
function formatTransactionType(type: string): string {
  const typeMap: Record<string, string> = {
    income: '💰 收入',
    expense: '💸 支出',
    transfer: '🔄 转账',
  };
  return typeMap[type] || type;
}

/**
 * 格式化交易状态
 */
function formatTransactionStatus(status: string): string {
  const statusMap: Record<string, string> = {
    draft: '📝 草稿',
    pending: '⏳ 待审核',
    approved: '✅ 已批准',
    rejected: '❌ 已拒绝',
    paid: '💵 已支付',
  };
  return statusMap[status] || status;
}

/**
 * 构建交易通知消息
 */
function buildTransactionMessage(
  transaction: TransactionNotificationData,
  action: string = 'created',
): string {
  const actionMap: Record<string, string> = {
    created: '📋 新增账目记录',
    updated: '✏️ 更新账目记录',
    deleted: '🗑️ 删除账目记录',
  };

  const lines: string[] = [
    `${actionMap[action] || '📋 账目记录'}`,
    '',
    `类型：${formatTransactionType(transaction.type)}`,
    `金额：${formatAmount(transaction.amount, transaction.currency)}`,
    `日期：${transaction.transactionDate}`,
  ];

  if (transaction.categoryName) {
    lines.push(`分类：${transaction.categoryName}`);
  }

  if (transaction.accountName) {
    lines.push(`账户：${transaction.accountName}`);
  }

  lines.push(`状态：${formatTransactionStatus(transaction.status)}`);

  if (transaction.description) {
    lines.push(``, `备注：${transaction.description}`);
  }

  lines.push(
    ``,
    `🕐 记录时间：${new Date().toLocaleString('zh-CN', { timeZone: 'Asia/Shanghai' })}`,
  );

  return lines.join('\n');
}

/**
 * 发送Telegram消息
 */
async function sendTelegramMessage(
  botToken: string,
  chatId: string,
  message: string,
): Promise<boolean> {
  try {
    const url = `https://api.telegram.org/bot${botToken}/sendMessage`;
    const response = await fetch(url, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({
        chat_id: chatId,
        text: message,
        parse_mode: 'HTML',
      }),
    });

    if (!response.ok) {
      const error = await response.json().catch(() => ({}));
      console.error(
        '[telegram-bot] Failed to send message:',
        response.status,
        error,
      );
      return false;
    }

    return true;
  } catch (error) {
    console.error('[telegram-bot] Error sending message:', error);
    return false;
  }
}

/**
 * 通知交易记录
 */
export async function notifyTransaction(
  transaction: TransactionNotificationData,
  action: string = 'created',
): Promise<void> {
  const configs = getEnabledNotificationConfigs('transaction');

  if (configs.length === 0) {
    console.log('[telegram-bot] No enabled notification configs found');
    return;
  }

  const message = buildTransactionMessage(transaction, action);

  const results = await Promise.allSettled(
    configs.map((config) =>
      sendTelegramMessage(config.botToken, config.chatId, message),
    ),
  );

  results.forEach((result, index) => {
    if (result.status === 'fulfilled' && result.value) {
      console.log(
        `[telegram-bot] Sent notification via config: ${configs[index].name}`,
      );
    } else {
      console.error(
        `[telegram-bot] Failed to send notification via config: ${configs[index].name}`,
      );
    }
  });
}

/**
 * 测试Telegram Bot配置
 */
export async function testTelegramConfig(
  botToken: string,
  chatId: string,
): Promise<{ success: boolean; error?: string }> {
  try {
    const testMessage = `🤖 KT财务系统\n\n✅ Telegram通知配置测试成功！\n\n🕐 ${new Date().toLocaleString('zh-CN', { timeZone: 'Asia/Shanghai' })}`;

    const success = await sendTelegramMessage(botToken, chatId, testMessage);

    if (success) {
      return { success: true };
    } else {
      return { success: false, error: '发送消息失败，请检查Bot Token和Chat ID' };
    }
  } catch (error: unknown) {
    return {
      success: false,
      error: error instanceof Error ? error.message : '未知错误',
    };
  }
}