import asyncio
import json
from datetime import datetime
from typing import Dict, Any
from redis.asyncio import Redis
from sqlalchemy.ext.asyncio import AsyncSession
from app.services.wechat_service import WechatService
from app.services.email_authorizations_service import EmailAuthorizationService
from app.utils.redis_utils import redis_qpop


THROTTLE_EXPIRY = 1800 

async def notification_consumer(session_factory, redis_client: Redis):
    """
    异步消费 Redis 队列 vas_notification_queue
    """
    queue_name = "vas_notification_queue"
    while True:
        try:
            # 阻塞获取队列消息
            message: Dict[str, Any] = await redis_qpop(redis_client, queue_name, timeout=5)
            if not message:
                await asyncio.sleep(1)  # 队列为空，休眠
                continue

            channel = message.get("channel", "")
            template_id = message.get("template_id")
            payload = message.get("payload", {})
            
            # 按渠道发送
            if "email" == channel:
                content = None
                sender = None
                subject = None
                receiver =  message.get("receiver", "")
                if "email_verification_for_bind" == template_id:
                    sender = "donotreply@visafly.top"
                    subject = "Email Verification"
                    content = template_for_bind_email(payload)
                if "email_verification_for_reset" == template_id:
                    sender = "donotreply@visafly.top"
                    subject = "Reset Password"
                    content = template_for_reset_pwd(payload)
                if "login_credentials" == template_id:
                    sender = "donotreply@visafly.top"
                    subject = "Your Account Details"
                    content = template_for_login_credentials(payload)
                if "ticket_created" == template_id:
                    sender = "donotreply@visafly.top"
                    subject = "Ticket Created"
                    content = template_ticket_open(payload)
                if "appointment_confirmation" == template_id:
                    sender = "donotreply@visafly.top"
                    subject = "Appointment Confirmation"
                    content = template_appointment_confirmation(payload)
                if content:
                    async with session_factory() as db:  # type: AsyncSession
                        auth = await EmailAuthorizationService.get_by_email(db, sender)
                        send_result = await EmailAuthorizationService.send_email(auth, receiver, subject, "html", content)
                        print(f"Email send result: {send_result}")

            if "wechat" == channel:
                api_token = "a8f79817-e18b-4739-8459-adb2ed5e2e32"
                
                if "payment_user_confirmed" == template_id:
                    status = await WechatService.push_payment_template(api_token, payload)
                    print(f"Wechat send status: {status}")
                
                if "slot_snapshot" == template_id:
                    # 1. 提取标识字段
                    country = payload.get("country", "unknown")
                    city = payload.get("city", "unknown")
                    visa_type = payload.get("visa_type", "unknown")
                    earliest_date = payload.get("earliest_date", "N/A")
                    
                    # 2. 生成 Redis 频率限制 Key
                    # 格式: throttle:slot_snapshot:USA:Beijing:B1
                    throttle_key = f"throttle:slot_snapshot:{country}:{city}:{visa_type}"
                    
                    # 3. 检查是否存在记录（即是否在冷却期内）
                    last_sent_val = await redis_client.get(throttle_key)
                    
                    # 4. 判断是否需要跳过
                    # 如果记录存在，且 earliest_date 没有变化，则跳过推送
                    if last_sent_val and last_sent_val == earliest_date:
                        print(f"⏭️  Skipped redundant Wechat notification for {country}-{city} (In Cooling Period)")
                        continue
                    
                    # 5. 执行发送
                    status = await WechatService.push_slot_snapshot(api_token, payload)
                    print(f"Wechat send status: {status}")
                    
                    # 6. 发送成功后更新 Redis 记录并设置过期时间
                    # 存储当前的最早日期，下次如果日期变了，即便没过 30 分钟也会再次推送
                    await redis_client.set(throttle_key, str(earliest_date), ex=THROTTLE_EXPIRY)
            print(f"✅ Notification sent: {message.get('notification_id')}")

        except Exception as e:
            print(f"⚠️ Notification consumer error: {e}")
            await asyncio.sleep(1)  # 避免异常循环过快

def template_for_bind_email(payload):
    """
    生成绑定邮箱验证码邮件
    
    Args:
        payload (dict): 包含以下字段:
            - app_name: 应用名称 (默认 Visafly)
            - code: 验证码
            - expiration_time: 过期时间描述 (如 "10 minutes")
    """
    
    # 1. 定义 HTML 模板
    template = '''
    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>Email Verification</title>
        <style>
            body { font-family: Arial, sans-serif; background-color: #f4f4f4; margin: 0; padding: 0; }
            .container { max-width: 600px; margin: 20px auto; background-color: #ffffff; padding: 30px; border-radius: 8px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); }
            .code { font-size: 24px; font-weight: bold; letter-spacing: 5px; color: #333; background-color: #f0f0f0; padding: 15px; text-align: center; border-radius: 4px; margin: 20px 0; }
            .footer { font-size: 12px; color: #888; margin-top: 30px; text-align: center; }
        </style>
    </head>
    <body>
        <div class="container">
            <h2>Verify your email address</h2>
            <p>Hello,</p>
            <p>You requested to bind this email address to your <strong>{{app_name}}</strong> account. Please use the verification code below to proceed:</p>
            
            <div class="code">{{code}}</div>
            
            <p>This code will expire in <strong>{{expiration_time}}</strong>.</p>
            <p>If you did not request this change, please ignore this email.</p>
            
            <br>
            <p>Best regards,<br>The {{app_name}} Team</p>
            
            <div class="footer">
                &copy; 2026 {{app_name}}. All rights reserved.
            </div>
        </div>
    </body>
    </html>
    '''

    # 2. 执行数据替换
    # 使用 .get() 提供默认值，防止缺少字段导致报错
    # 使用 str() 确保数据是字符串类型
    app_name = str(payload.get('app_name', 'Visafly'))
    code = str(payload.get('code', ''))
    expiration_time = str(payload.get('expiration_time', '10 minutes'))

    # 链式替换所有占位符
    html_content = template.replace('{{app_name}}', app_name) \
                           .replace('{{code}}', code) \
                           .replace('{{expiration_time}}', expiration_time)

    return html_content

def template_for_reset_pwd(payload):
    """
    生成重置密码验证码邮件
    
    Args:
        payload (dict): 包含以下字段:
            - app_name: 应用名称 (默认 Visafly)
            - code: 验证码
            - expiration_time: 过期时间描述 (如 "10 minutes")
    """
    
    # 1. 定义 HTML 模板
    template = '''
    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>Reset Password</title>
        <style>
            body { font-family: 'Helvetica Neue', Arial, sans-serif; background-color: #f9f9f9; margin: 0; padding: 0; color: #333; }
            .container { max-width: 600px; margin: 40px auto; background-color: #ffffff; padding: 40px; border-radius: 8px; box-shadow: 0 4px 10px rgba(0,0,0,0.05); }
            .header { border-bottom: 1px solid #eee; padding-bottom: 20px; margin-bottom: 30px; }
            .header h2 { margin: 0; color: #333; }
            .code { font-size: 32px; font-weight: bold; letter-spacing: 5px; color: #2563eb; background-color: #eff6ff; padding: 20px; text-align: center; border-radius: 8px; margin: 30px 0; border: 1px solid #dbeafe; }
            .warning { background-color: #fff7ed; border-left: 4px solid #f97316; padding: 15px; font-size: 14px; color: #c2410c; margin-top: 30px; }
            .footer { font-size: 12px; color: #999; margin-top: 40px; text-align: center; border-top: 1px solid #eee; padding-top: 20px; }
        </style>
    </head>
    <body>
        <div class="container">
            <div class="header">
                <h2>Password Reset Request</h2>
            </div>
            
            <p>Hello,</p>
            <p>We received a request to reset the password for your <strong>{{app_name}}</strong> account. Please use the following code to verify your identity:</p>
            
            <div class="code">{{code}}</div>
            
            <p>This code is valid for <strong>{{expiration_time}}</strong>.</p>
            
            <div class="warning">
                <strong>Security Tip:</strong> If you did not request a password reset, please ignore this email. No changes will be made to your account.
            </div>
            
            <br>
            <p>Best regards,<br>The {{app_name}} Team</p>
            
            <div class="footer">
                &copy; 2026 {{app_name}}. All rights reserved.<br>
                This is an automated message, please do not reply.
            </div>
        </div>
    </body>
    </html>
    '''

    # 2. 执行数据替换
    # 使用 .get() 提供默认值，防止缺少字段导致报错
    # 使用 str() 确保数据是字符串类型，防止 replace 报错
    app_name = str(payload.get('app_name', 'Visafly'))
    code = str(payload.get('code', ''))
    expiration_time = str(payload.get('expiration_time', '10 minutes'))

    html_content = template.replace('{{app_name}}', app_name) \
                           .replace('{{code}}', code) \
                           .replace('{{expiration_time}}', expiration_time)

    return html_content
    
def template_for_login_credentials(payload):
    """
    生成用户登录凭证邮件 (账号 + 临时密码)
    
    Args:
        payload (dict): 包含以下字段:
            - app_name: 应用名称
            - username: 登录账号
            - password: 临时密码
            - login_url: 登录链接
    """
    
    # 1. 定义 HTML 模板
    template = '''
    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>Your Account Details</title>
        <style>
            body { font-family: 'Helvetica Neue', Arial, sans-serif; background-color: #f4f6f8; margin: 0; padding: 0; color: #333; }
            .container { max-width: 600px; margin: 40px auto; background-color: #ffffff; padding: 40px; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.05); }
            .header { text-align: center; border-bottom: 1px solid #eee; padding-bottom: 20px; margin-bottom: 30px; }
            .header h1 { font-size: 24px; color: #1a1a1a; margin: 0; }
            .creds-box { background-color: #f0f7ff; border: 1px solid #dbeafe; border-radius: 8px; padding: 20px; margin: 25px 0; }
            .creds-item { margin-bottom: 10px; font-size: 16px; }
            .creds-label { font-weight: bold; color: #555; width: 100px; display: inline-block; }
            .creds-value { font-family: 'Courier New', Courier, monospace; font-weight: bold; color: #2563eb; }
            .btn { display: block; width: 200px; margin: 30px auto; background-color: #2563eb; color: #ffffff !important; text-align: center; padding: 12px 0; border-radius: 6px; text-decoration: none; font-weight: bold; }
            .note { font-size: 13px; color: #666; background-color: #fff4e5; padding: 10px; border-radius: 4px; border-left: 4px solid #f97316; }
            .footer { font-size: 12px; color: #999; margin-top: 40px; text-align: center; }
        </style>
    </head>
    <body>
        <div class="container">
            <div class="header">
                <h1>Welcome to {{app_name}}</h1>
            </div>
            
            <p>Dear User,</p>
            <p>Your account has been successfully set up. Below are your temporary login credentials.</p>
            
            <div class="creds-box">
                <div class="creds-item">
                    <span class="creds-label">Username:</span>
                    <span class="creds-value">{{username}}</span>
                </div>
                <div class="creds-item">
                    <span class="creds-label">Password:</span>
                    <span class="creds-value">{{password}}</span>
                </div>
            </div>

            <div class="note">
                <strong>Important:</strong> For your security, please change your password immediately after logging in.
            </div>

            <a href="{{login_url}}" class="btn">Log In Now</a>
            
            <p style="text-align: center; font-size: 14px;">
                Or copy this link: <a href="{{login_url}}">{{login_url}}</a>
            </p>

            <div class="footer">
                &copy; 2026 {{app_name}}. All rights reserved.<br>
                If you did not request this account, please contact support.
            </div>
        </div>
    </body>
    </html>
    '''

    # 2. 执行数据替换
    # 使用 payload.get() 提供默认值，防止缺少字段导致报错
    app_name = str(payload.get('app_name', 'Visafly'))
    username = str(payload.get('username', ''))
    password = str(payload.get('password', ''))
    login_url = str(payload.get('login_url', '#'))

    # 链式替换所有占位符
    html_content = template.replace('{{app_name}}', app_name) \
                           .replace('{{username}}', username) \
                           .replace('{{password}}', password) \
                           .replace('{{login_url}}', login_url)

    return html_content
    
def template_ticket_open(payload):
    """
    生成工单创建通知邮件
    payload 需包含: username, ticket_id, ticket_type, created_at, ticket_url, app_name
    """
    
    # --- 1. 处理时间格式化逻辑 ---
    raw_time = payload.get('created_at')
    formatted_time = ""

    if isinstance(raw_time, datetime):
        # 如果传入的是 datetime 对象
        formatted_time = raw_time.strftime('%Y-%m-%d %H:%M') + " (UTC)"
    elif isinstance(raw_time, str):
        try:
            # 如果传入的是 ISO 字符串 (例如 '2025-12-31T02:33:00Z')
            # 截取前19位通常能兼容大部分 ISO 格式
            dt_obj = datetime.fromisoformat(raw_time.replace('Z', '+00:00'))
            formatted_time = dt_obj.strftime('%Y-%m-%d %H:%M') + " (UTC)"
        except ValueError:
            # 如果解析失败，直接显示原字符串
            formatted_time = raw_time
    else:
        formatted_time = "N/A"

    # --- 2. HTML 模板 ---
    # 注意：这里保持了 {{key}} 占位符，下面会统一替换
    template = '''
    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>Ticket Created</title>
        <style>
            body { font-family: 'Helvetica Neue', Arial, sans-serif; background-color: #f4f6f8; margin: 0; padding: 0; color: #333; }
            .container { max-width: 600px; margin: 40px auto; background-color: #ffffff; padding: 40px; border-radius: 8px; box-shadow: 0 4px 12px rgba(0,0,0,0.05); }
            .header { border-bottom: 1px solid #eee; padding-bottom: 20px; margin-bottom: 30px; }
            .header h1 { font-size: 22px; color: #1a1a1a; margin: 0; }
            .ticket-info { background-color: #f8fafc; border: 1px solid #e2e8f0; border-radius: 8px; padding: 20px; margin: 20px 0; }
            .info-row { margin-bottom: 10px; display: flex; justify-content: space-between; }
            .info-label { color: #64748b; font-size: 14px; }
            .info-value { font-weight: bold; color: #0f172a; font-size: 14px; }
            .btn { display: block; width: 200px; margin: 30px auto; background-color: #2563eb; color: #ffffff !important; text-align: center; padding: 12px 0; border-radius: 6px; text-decoration: none; font-weight: bold; font-size: 14px; }
            .footer { font-size: 12px; color: #94a3b8; margin-top: 40px; text-align: center; }
        </style>
    </head>
    <body>
        <div class="container">
            <div class="header">
                <h1>Support Request Received</h1>
            </div>
            
            <p>Hello {{username}},</p>
            <p>We wanted to let you know that we've received your request. Our team is currently reviewing the details.</p>
            
            <div class="ticket-info">
                <div class="info-row">
                    <span class="info-label">Ticket ID:</span>
                    <span class="info-value">#{{ticket_id}}</span>
                </div>
                <div class="info-row">
                    <span class="info-label">Type:</span>
                    <span class="info-value">{{ticket_type}}</span>
                </div>
                <div class="info-row" style="margin-bottom: 0;">
                    <span class="info-label">Created Time:</span>
                    <!-- 使用格式化后的时间 -->
                    <span class="info-value">{{created_at}}</span>
                </div>
            </div>

            <p>We usually reply within 24 hours. You will receive an email notification when our agent replies.</p>

            <a href="{{ticket_url}}" class="btn">View Ticket Details</a>
            
            <div class="footer">
                &copy; 2025 {{app_name}}. All rights reserved.<br>
                Please do not reply to this email directly.
            </div>
        </div>
    </body>
    </html>
    '''

    # --- 3. 执行替换 ---
    # 使用 payload 中的数据替换模板占位符
    html_content = template.replace('{{username}}', str(payload.get('username', 'User'))) \
                           .replace('{{ticket_id}}', str(payload.get('ticket_id', ''))) \
                           .replace('{{ticket_type}}', str(payload.get('ticket_type', ''))) \
                           .replace('{{created_at}}', formatted_time) \
                           .replace('{{ticket_url}}', str(payload.get('ticket_url', '#'))) \
                           .replace('{{app_name}}', str(payload.get('app_name', 'Visafly')))

    return html_content

def template_appointment_confirmation(payload):
    """
    生成预约成功确认邮件 (VisaFly)
    
    payload 需包含: 
    - username: 用户名
    - order_id: 订单号 (新增)
    - country: 国家
    - city: 城市
    - appointment_date: 预约时间 (字符串, 例如 "2026-03-15 09:00")
    - visa_type: 签证类型
    - user_email: 用户邮箱 (用于提示信件已发往此处)
    """
    
    # --- 1. 基础配置 (VisaFly) ---
    company_name = "VisaFly"
    support_email = "support@visafly.top"
    website_home = "https://visafly.top"
    website_contact = "https://visafly.top/refund-policy"

    # --- 2. HTML 模板 ---
    template = '''
    <!DOCTYPE html>
    <html>
    <head>
        <meta charset="UTF-8">
        <title>Appointment Confirmed</title>
        <style>
            body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; background-color: #f4f6f8; margin: 0; padding: 0; color: #333; }
            .container { max-width: 600px; margin: 30px auto; background-color: #ffffff; border-radius: 8px; overflow: hidden; box-shadow: 0 4px 12px rgba(0,0,0,0.05); }
            
            /* 头部: 品牌蓝 */
            .header { background-color: #0056b3; padding: 30px 20px; text-align: center; color: white; }
            .header h1 { margin: 0; font-size: 24px; font-weight: bold; }
            .header .subtitle { margin-top: 5px; opacity: 0.9; font-size: 14px; }
            
            /* 正文区域 */
            .content { padding: 30px 25px; line-height: 1.6; }
            
            /* 核心警告框 (黄色高亮 - 强调查收邮件) */
            .alert-box { background-color: #fff8e1; border-left: 5px solid #ffc107; padding: 15px 20px; margin: 25px 0; border-radius: 4px; }
            .alert-title { font-weight: bold; color: #b00020; display: block; margin-bottom: 5px; font-size: 16px; }
            
            /* 订单详情卡片 */
            .details-box { background-color: #f8fafc; border: 1px solid #e2e8f0; border-radius: 6px; padding: 15px; margin-bottom: 25px; }
            .info-row { display: flex; justify-content: space-between; margin-bottom: 10px; border-bottom: 1px dashed #e2e8f0; padding-bottom: 8px; }
            .info-row:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
            .label { color: #64748b; font-size: 13px; font-weight: 500; }
            .value { font-weight: bold; color: #0f172a; font-size: 14px; text-align: right; }
            
            /* 底部联系方式 */
            .help-section { background-color: #f1f5f9; padding: 20px; text-align: center; font-size: 14px; color: #475569; border-top: 1px solid #e2e8f0; }
            .contact-link { color: #0056b3; font-weight: bold; text-decoration: none; margin: 0 5px; }
            
            .footer { text-align: center; padding: 20px; font-size: 12px; color: #94a3b8; }
            a { color: #0056b3; text-decoration: none; }
        </style>
    </head>
    <body>
        <div class="container">
            <div class="header">
                <h1>✅ Booking Successful!</h1>
                <div class="subtitle">Appointment Secured by {{company_name}}</div>
            </div>
            
            <div class="content">
                <p>Hello <b>{{username}}</b>,</p>
                <p>Great news! We have successfully secured your appointment slot.</p>
                
                <!-- 详情卡片 -->
                <div class="details-box">
                    <div class="info-row">
                        <span class="label">Order ID:</span>
                        <span class="value">#{{order_id}}</span>
                    </div>
                    <div class="info-row">
                        <span class="label">Country / City:</span>
                        <span class="value">{{country}} - {{city}}</span>
                    </div>
                    <div class="info-row">
                        <span class="label">Appointment Date:</span>
                        <span class="value">{{appointment_date}}</span>
                    </div>
                    <div class="info-row">
                        <span class="label">Visa Type:</span>
                        <span class="value">{{visa_type}}</span>
                    </div>
                </div>

                <!-- 核心：检查邮件提示 -->
                <div class="alert-box">
                    <span class="alert-title">📩 Important: Check Your Email</span>
                    We have sent the official confirmation letter to <b>{{user_email}}</b>.<br><br>
                    <span style="font-size: 13px;">If you don't see it in your Inbox, please check your <b>Spam/Junk</b> folder immediately.</span>
                </div>
            </div>

            <!-- 兜底联系方式 -->
            <div class="help-section">
                <p style="margin-top: 0; font-weight: bold;">Did not receive the email?</p>
                <p style="margin-bottom: 15px;">Please check your Spam folder first. If still missing, contact us:</p>
                
                <!-- 方式1: 邮件 -->
                <a href="mailto:{{support_email}}" class="contact-link">✉️ Email Support</a>
                <span style="color: #cbd5e1;">|</span>
                <!-- 方式2: 官网 -->
                <a href="{{website_contact}}" class="contact-link">🌐 Contact Us</a>
            </div>
            
            <div class="footer">
                &copy; 2026 {{company_name}}. All rights reserved.<br>
                <a href="{{website_home}}">{{website_home}}</a>
            </div>
        </div>
    </body>
    </html>
    '''

    # --- 3. 执行替换 ---
    html_content = template.replace('{{username}}', str(payload.get('username', 'Customer'))) \
                           .replace('{{order_id}}', str(payload.get('order_id', 'N/A'))) \
                           .replace('{{country}}', str(payload.get('country', ''))) \
                           .replace('{{city}}', str(payload.get('city', ''))) \
                           .replace('{{appointment_date}}', str(payload.get('appointment_date', 'Confirmed'))) \
                           .replace('{{user_email}}', str(payload.get('user_email', 'your email'))) \
                           .replace('{{visa_type}}', str(payload.get('visa_type', 'Standard'))) \
                           .replace('{{company_name}}', company_name) \
                           .replace('{{support_email}}', support_email) \
                           .replace('{{website_contact}}', website_contact) \
                           .replace('{{website_home}}', website_home)

    return html_content