const nodemailer = require('nodemailer')
const config = require('../../config.json')
const path = require('path')
const Logger = require('../../lib/Logger')

const logger = new Logger(path.join(__dirname, '../../logs/Email.log'), 'INFO')

/**
 * 尝试用多个邮箱配置发送邮件；失败时仅记录日志并 resolve(false)，不抛错、不 reject。
 * @param {string} email - 收件人邮箱
 * @param {string} subject - 邮件主题
 * @param {string} content - 邮件内容（支持 HTML）
 * @returns {Promise<boolean>} 是否至少有一个账号发送成功
 */
async function sendEmail(email, subject, content) {
    const mail = {
        to: email,
        subject,
        html: content
    }

    if (!Array.isArray(config.email) || config.email.length === 0) {
        logger.error('邮件发送失败：未配置可用邮箱账号')
        return false
    }

    for (let i = 0; i < config.email.length; i++) {
        const currentConfig = config.email[i]
        if (!currentConfig?.host || !currentConfig?.user) {
            logger.error(`邮件发送失败：第 ${i + 1} 个邮箱配置不完整，已跳过`)
            continue
        }

        let transporter
        try {
            transporter = nodemailer.createTransport({
                host: currentConfig.host,
                port: currentConfig.port,
                secure: currentConfig.secure === true,
                auth: {
                    user: currentConfig.user,
                    pass: currentConfig.password
                }
            })
        } catch (error) {
            logger.error(`邮件传输器创建失败 (${currentConfig.user})：${error.stack || error.message || error}`)
            continue
        }

        mail.from = currentConfig.from || currentConfig.user

        try {
            await transporter.sendMail(mail)
            logger.info(`${email} 邮件发送成功，使用账号: ${currentConfig.user}`)
            return true
        } catch (error) {
            logger.error(`邮件发送失败 (${currentConfig.user})，错误: ${error.stack || error.message || error}`)
        }
    }

    logger.error('邮件发送失败，所有邮箱配置均不可用')
    return false
}

module.exports = sendEmail