import hmac
import hashlib
import time
from typing import Optional

import requests
from flask import Blueprint, render_template, request, session, redirect, url_for, flash

from utils.logger_config import logger

auth_bp = Blueprint('auth', __name__)

# 登录账号配置
ADMIN_USERNAME = 'admin'
ADMIN_PASSWORD = 'HNYZ0821'

# 统一登录平台配置
SSO_APP_ID = 'app_aa755b61de0b3da8'
SSO_APP_SECRET = 'ND5bv3WjAc8DwueDSoRXAC04XUyV1X1D'
SSO_LOGIN_URL = 'https://api.hnyunzhu.com/login'
SSO_VALIDATE_URL = 'https://api.hnyunzhu.com/api/v1/simple/validate'


def _generate_signature(secret: str, params: dict) -> str:
    """生成 HMAC-SHA256 签名"""
    data = {k: v for k, v in params.items() if k != "sign" and v is not None}
    sorted_keys = sorted(data.keys())
    query_string = "&".join([f"{k}={data[k]}" for k in sorted_keys])
    return hmac.new(
        secret.encode('utf-8'),
        query_string.encode('utf-8'),
        hashlib.sha256
    ).hexdigest()


def _validate_ticket(ticket: str) -> Optional[dict]:
    """调用 UAP 验证票据"""
    payload = {
        "app_id": SSO_APP_ID,
        "ticket": ticket,
        "timestamp": int(time.time())
    }
    payload["sign"] = _generate_signature(SSO_APP_SECRET, payload)
    try:
        resp = requests.post(SSO_VALIDATE_URL, json=payload, timeout=10)
        result = resp.json()
        logger.info(f"[SSO] validate 请求: url={SSO_VALIDATE_URL}, status={resp.status_code}, response={result}")
        return result
    except Exception as e:
        logger.exception(f"[SSO] validate 请求异常: ticket={ticket[:20]}..., error={e}")
        return None


@auth_bp.route('/login', methods=['GET', 'POST'])
def login():
    """登录页面"""
    if request.method == 'POST':
        username = request.form.get('username')
        password = request.form.get('password')
        
        if username == ADMIN_USERNAME and password == ADMIN_PASSWORD:
            session['logged_in'] = True
            # flash('登录成功', 'success') # 登录成功不需要提示，直接进
            return redirect(url_for('main.index'))
        else:
            flash('账号或密码错误', 'error')
            return render_template('login.html')
            
    return render_template('login.html')

@auth_bp.route('/login/sso')
def login_sso():
    """跳转到统一登录平台"""
    return redirect(f"{SSO_LOGIN_URL}?app_id={SSO_APP_ID}")


@auth_bp.route('/callback')
def sso_callback():
    """统一登录回调：验证 ticket，valid 通过则登录"""
    ticket = request.args.get('ticket')
    logger.info(f"[SSO] callback 收到请求: args={dict(request.args)}")

    if not ticket:
        logger.warning("[SSO] callback 缺少 ticket 参数")
        flash('无效的回调', 'error')
        return redirect(url_for('auth.login'))

    result = _validate_ticket(ticket)
    if result and result.get('valid') is True:
        logger.info(f"[SSO] 验证通过，登录成功: user_id={result.get('user_id')}, mobile={result.get('mobile')}")
        session['logged_in'] = True
        return redirect(url_for('main.index'))
    else:
        logger.warning(f"[SSO] 验证失败: result={result}")
        flash('统一登录验证失败', 'error')
        return redirect(url_for('auth.login'))


@auth_bp.route('/logout')
def logout():
    """登出"""
    session.pop('logged_in', None)
    flash('已退出登录', 'success')
    return redirect(url_for('auth.login'))