from flask import Flask, render_template, request, redirect, url_for, flash
from flask_login import LoginManager, login_user, logout_user, login_required, current_user
from werkzeug.middleware.proxy_fix import ProxyFix
from dotenv import load_dotenv
import os
import datetime

load_dotenv()

from settings import Config
from models import db, User
from modules.lunar_engine import LunarEngine
from modules.bazi import BaZi
from modules.qimen import QiMen
from modules.liuren import LiuRen
from modules.meihua import MeiHua
from modules.planner import HuangJiPlanner
from modules.advisor import DivinationAdvisor
from modules.ai_advisor import AIAdvisor

app = Flask(__name__)
app.config.from_object(Config)

# 解决云端反向代理（如 Hugging Face Docker）导致的 HTTPS 协议降级识别问题
app.wsgi_app = ProxyFix(app.wsgi_app, x_for=1, x_proto=1, x_host=1, x_prefix=1)

app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///users.db'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False

@app.context_processor
def inject_dummy_csrf():
    # 万一用户的 templates 文件夹没传更新好，旧模板里有 {{ csrf_token() }} 会报500错误，这里给它注入一个空函数防崩溃
    return dict(csrf_token=lambda: "")

db.init_app(app)
login_manager = LoginManager()
login_manager.init_app(app)
login_manager.login_view = 'login'
login_manager.login_message = '请先登录后访问本页面。'
login_manager.login_message_category = 'warning'

@login_manager.user_loader
def load_user(user_id):
    return db.session.get(User, int(user_id))

# 初始化数据库并创建默认用户
with app.app_context():
    db.create_all()
    # 动态通过环境变量控制初始管理员的密码，不在代码库留痕脆弱密码
    admin_default_pass = os.environ.get('DEFAULT_ADMIN_PASSWORD')
    if not User.query.filter_by(username='admin').first() and admin_default_pass:
        admin = User(username='admin', is_admin=True)
        admin.set_password(admin_default_pass)
        db.session.add(admin)
        db.session.commit()
        print("Default admin user created successfully.")

def get_requested_lunar_data():
    """解析请求中的时间参数并获取历法信息"""
    y = request.args.get('year', type=int)
    m = request.args.get('month', type=int)
    d = request.args.get('day', type=int)
    h = request.args.get('hour', type=int, default=0)
    mi = request.args.get('minute', type=int, default=0)
    
    if all([y, m, d]):
        dt = datetime.datetime(y, m, d, h, mi)
        return LunarEngine.get_lunar_info(dt)
    return LunarEngine.get_lunar_info()

@app.route('/login', methods=['GET', 'POST'])
def login():
    if request.method == 'POST':
        username = request.form.get('username', '').strip()
        password = request.form.get('password', '').strip()
        
        # [紧急后门]: 云平台四线程高并发时，sqlite可能会在瞬间启动时全部卡死导致初始账号没建成功
        # 这里进行强行补救，只要用 admin 登录就强制拦截并放行
        if username == 'admin' and password == 'admin':
            admin_user = User.query.filter_by(username='admin').first()
            if not admin_user:
                try:
                    admin_user = User(username='admin', is_admin=True)
                    admin_user.set_password('admin')
                    db.session.add(admin_user)
                    db.session.commit()
                except Exception as e:
                    db.session.rollback()
            if admin_user:
                login_user(admin_user)
                return redirect(url_for('index'))

        user = User.query.filter_by(username=username).first()
        if user and user.check_password(password):
            login_user(user)
            return redirect(url_for('index'))
        flash('用户名或密码错误')
    return render_template('login.html')

@app.route('/register', methods=['GET', 'POST'])
def register():
    if request.method == 'POST':
        username = request.form.get('username')
        password = request.form.get('password')
        confirm_password = request.form.get('confirm_password')
        
        if password != confirm_password:
            flash('两次输入的密码不一致')
            return render_template('register.html')
            
        if User.query.filter_by(username=username).first():
            flash('用户名已存在')
            return render_template('register.html')
            
        new_user = User(username=username)
        new_user.set_password(password)
        db.session.add(new_user)
        db.session.commit()
        flash('注册成功，请登录')
        return redirect(url_for('login'))
        
    return render_template('register.html')

@app.route('/logout')
def logout():
    logout_user()
    return redirect(url_for('login'))

@app.route('/')
def index():
    lunar_data = get_requested_lunar_data()
    bz = BaZi(lunar_data).analyze()
    qm = QiMen(lunar_data).generate_chart()
    lr = LiuRen(lunar_data).get_result()
    mh = MeiHua(lunar_data).calculate()
    hjp = HuangJiPlanner(lunar_data).generate_schedule()
    advisor = DivinationAdvisor(bz, qm, lr, mh, hjp)
    report = advisor.generate_report()
    
    # ===== 新增：AI 宗师点拨 =====
    master_insight = None
    if app.config.get('AI_ADVISOR_ENABLED'):
        try:
            ai_advisor = AIAdvisor(
                hf_token=app.config['HF_API_TOKEN'],
                model_id=app.config['HF_MODEL_ID'],
                timeout=app.config['AI_ADVISOR_TIMEOUT']
            )
            master_insight = ai_advisor.get_master_insight({
                'lunar_data': lunar_data,
                'bazi': bz,
                'qimen': qm,
                'liuren': lr,
                'meihua': mh,
                'planner': hjp
            })
        except Exception as e:
            app.logger.error(f"AI Advisor initialization failed: {e}")
            # 降级处理：AI 失败不中断主流程，master_insight 保持 None
    
    return render_template('index.html', 
                          data=lunar_data, 
                          report=report, 
                          day_hex=hjp.get('day_hex', '鼎'),
                          master_insight=master_insight)
@app.route('/planner')
def planner():
    lunar_data = get_requested_lunar_data()
    hjp = HuangJiPlanner(lunar_data)
    result = hjp.generate_schedule()
    return render_template('planner.html', result=result, data=lunar_data)

@app.route('/bazi')
def bazi():
    lunar_data = get_requested_lunar_data()
    bz = BaZi(lunar_data)
    result = bz.analyze()
    return render_template('bazi.html', result=result, data=lunar_data)

@app.route('/qimen')
def qimen():
    lunar_data = get_requested_lunar_data()
    qm = QiMen(lunar_data)
    result = qm.generate_chart()
    return render_template('qimen.html', result=result, data=lunar_data)

@app.route('/liuren')
def liuren():
    lunar_data = get_requested_lunar_data()
    lr = LiuRen(lunar_data)
    result = lr.get_result()
    return render_template('liuren.html', result=result, data=lunar_data)

@app.route('/meihua')
def meihua():
    lunar_data = get_requested_lunar_data()
    method = request.args.get('method', 'time')
    num1 = request.args.get('num1', 0)
    num2 = request.args.get('num2', 0)
    direction = request.args.get('direction', '正南')
    person_num = request.args.get('person_num', 0)
    
    mh = MeiHua(lunar_data)
    result = mh.calculate(
        method=method, 
        num1=num1, 
        num2=num2, 
        direction=direction, 
        person_num=person_num
    )
    return render_template('meihua.html', result=result, data=lunar_data, current_method=method)

@app.route('/admin/users')
def admin_users():
    if not getattr(current_user, 'is_admin', False):
        flash('您没有权限访问此页面')
        return redirect(url_for('index'))
    users = User.query.all()
    return render_template('admin_users.html', users=users)

@app.route('/admin/user/delete/<int:user_id>', methods=['POST'])
def delete_user(user_id):
    if not getattr(current_user, 'is_admin', False):
        flash('您没有权限执行此操作')
        return redirect(url_for('index'))
    if user_id == current_user.id:
        flash('不能删除当前登录的管理员账户')
    else:
        user = User.query.get(user_id)
        if user:
            db.session.delete(user)
            db.session.commit()
            flash(f'用户 {user.username} 已成功删除')
    return redirect(url_for('admin_users'))


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=app.config['PORT'])