import os
import json
import time
import threading
import requests
from datetime import datetime
from flask import Flask, jsonify
from flask_sqlalchemy import SQLAlchemy
from flask_cors import CORS
from lxml import etree

# --- 初始化 Flask App ---
app = Flask(__name__)
CORS(app)  # 解决前端 Vite 5173 端口的跨域问题

# --- 数据库配置 (SQLite) ---
# 数据库文件将生成在 backend 目录下
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///monitor_data.db'
app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
db = SQLAlchemy(app)


# --- 数据库模型 ---
class ErrorLog(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    source = db.Column(db.String(50))  # 106网站 / 82网站
    name = db.Column(db.String(100))  # 设备名称/站点ID
    reason = db.Column(db.String(255))  # 状态描述
    offset = db.Column(db.String(50))  # 日期偏移 (如: 滞后 2 天)
    latest_time = db.Column(db.String(50))  # 最新文件日期
    check_time = db.Column(db.String(50))  # 本次检查时间
    content = db.Column(db.Text, nullable=True)  # 专门存储 Tower_ 站点的 JSON 内容


# 每次启动时确保表结构已建立
with app.app_context():
    db.create_all()

# --- 基础配置 ---
DATA_ROOT = "data"
FRPS_DIR = os.path.join(DATA_ROOT, "frps_106")
WEATHER_DIR = os.path.join(DATA_ROOT, "weather_82")

for d in [FRPS_DIR, WEATHER_DIR]:
    os.makedirs(d, exist_ok=True)

CONFIG = {
    "106": {
        "base_url": "http://106.75.72.40:7500/api/proxy/tcp",
        "primary_auth": "Basic YWRtaW46bGljYWhr",
        "login_payload": {"username": "admin", "password": "licahk", "recaptcha": ""}
    },
    "82": {
        "base_url": "http://82.156.1.111/weather/php",
        "login": {'username': 'renlixin', 'password': 'licahk', 'login': '123'}
    }
}

is_running = False  # 全局任务状态锁


# --- 通用工具函数 ---

def add_error_to_db(source, name, reason, latest_time="N/A", content=None):
    """计算日期偏移并记录到数据库"""
    days_diff = "N/A"
    if latest_time and latest_time != "N/A":
        try:
            # 兼容 2024_01_01 和 2024-01-01 格式
            clean_date_str = str(latest_time).split()[0].replace('_', '-')
            target_date = datetime.strptime(clean_date_str, "%Y-%m-%d").date()
            today_date = datetime.now().date()
            diff = (today_date - target_date).days
            days_diff = f"滞后 {diff} 天" if diff > 0 else "当天已同步"
        except:
            days_diff = "解析失败"

    log = ErrorLog(
        source=source,
        name=name,
        reason=reason,
        offset=days_diff,
        latest_time=latest_time,
        check_time=datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
        content=content
    )
    db.session.add(log)


def find_closest_item(items, is_date_level=True):
    if not items or not isinstance(items, list): return None
    today = datetime.now()
    scored_items = []
    for item in items:
        if not isinstance(item, dict): continue
        name_val = item.get('name', '')
        path_val = item.get('path', '')
        target_str = name_val if name_val else path_val.split('/')[-1]
        try:
            if is_date_level:
                current_date = datetime.strptime(target_str, "%Y_%m_%d")
            else:
                mod_str = item.get('modified', '')
                if mod_str:
                    current_date = datetime.fromisoformat(mod_str.replace('Z', '+00:00'))
                else:
                    continue
            diff = abs((today - current_date.replace(tzinfo=None)).total_seconds())
            scored_items.append((diff, item, target_str))
        except:
            continue
    if not scored_items: return None
    scored_items.sort(key=lambda x: x[0])
    return scored_items[0]


def process_text_content(raw_content):
    if not raw_content: return ""
    lines = str(raw_content).split('\n')
    result, current = [], ""
    for line in lines:
        if "    " in line:
            current += line.strip()
        else:
            if current: result.append(current)
            current = line.strip()
    if current: result.append(current)
    return "\n".join(result)


# --- 106 业务逻辑 ---

def get_106_dynamic_token(port):
    url = f"http://106.75.72.40:{port}/api/login"
    try:
        resp = requests.post(url, json=CONFIG["106"]["login_payload"], timeout=10)
        if resp.status_code == 200:
            return resp.text.strip().replace('"', '')
    except:
        pass
    return None


def run_106_logic():
    c = CONFIG["106"]
    today_str = datetime.now().strftime("%Y_%m_%d")
    try:
        main_headers = {"Authorization": c["primary_auth"], "User-Agent": "Mozilla/5.0"}
        resp = requests.get(c["base_url"], headers=main_headers, timeout=15)
        if resp.status_code != 200:
            add_error_to_db("106网站", "主入口API", f"访问失败: HTTP {resp.status_code}")
            return

        for item in resp.json().get('proxies', []):
            name = item.get('name', 'Unknown')
            if not name.lower().endswith('_data'): continue

            status = str(item.get('status', '')).lower().strip()
            if status != 'online':
                add_error_to_db("106网站", name, f"设备离线 ({status})")
                continue

            name_up = name.upper()
            is_tower_underscore = "TOWER_" in name_up
            is_tower_i = "TOWER" in name_up and not is_tower_underscore
            if not (is_tower_underscore or is_tower_i): continue

            try:
                port = item.get('conf', {}).get('remote_port')
                token = get_106_dynamic_token(port)
                if not token:
                    add_error_to_db("106网站", name, "Token获取失败")
                    continue

                headers = {"Authorization": c["primary_auth"], "x-auth": token, "User-Agent": "Mozilla/5.0"}
                api_root = "/api/resources/Data/" if is_tower_underscore else "/api/resources/data/"

                res2 = requests.get(f"http://106.75.72.40:{port}{api_root}", headers=headers, timeout=10)
                best_date = find_closest_item(res2.json().get('items', []), is_date_level=True)

                if not best_date or best_date[2] != today_str:
                    add_error_to_db("106网站", name, "未找到今日文件夹", best_date[2] if best_date else "N/A")
                    continue

                date_path = f"{api_root}{best_date[2]}/"
                res3 = requests.get(f"http://106.75.72.40:{port}{date_path}", headers=headers, timeout=10)
                best_file = find_closest_item(res3.json().get('items', []), is_date_level=False)

                if not best_file:
                    add_error_to_db("106网站", name, "文件夹内无文件", best_date[2])
                    continue

                file_item = best_file[1]
                full_path = file_item.get('path') or f"{date_path}{file_item.get('name')}"

                if is_tower_i:
                    # TowerI 模式：.bin 文件存入磁盘
                    raw_url = f"http://106.75.72.40:{port}/api/raw{full_path}"
                    res4 = requests.get(raw_url, headers=headers, timeout=20)
                    if res4.status_code == 200:
                        save_path = os.path.join(FRPS_DIR, f"{name}_{today_str}.bin")
                        with open(save_path, 'wb') as f:
                            f.write(res4.content)
                        add_error_to_db("106网站", name, "运行正常 (Bin已存盘)", today_str)
                else:
                    # Tower_ 模式：JSON 内容存入数据库
                    file_api_url = f"http://106.75.72.40:{port}/api/resources{full_path}"
                    res4 = requests.get(file_api_url, headers=headers, timeout=20)
                    file_json = res4.json()
                    raw_content = file_json.get('content', '') if file_json else None
                    if raw_content:
                        clean_content = process_text_content(raw_content)
                        add_error_to_db("106网站", name, "运行正常", today_str, content=clean_content)
                    else:
                        add_error_to_db("106网站", name, "JSON内容为空", best_date[2])

            except Exception as e:
                add_error_to_db("106网站", name, f"站点处理崩溃: {str(e)}")
    except Exception as e:
        add_error_to_db("106网站", "全局逻辑", str(e))


# --- 82 业务逻辑 ---

def run_82_logic():
    c = CONFIG["82"]
    session = requests.Session()
    today_fmt = datetime.now().strftime("%Y-%m-%d")
    try:
        session.post(f"{c['base_url']}/login.php", data=c["login"], timeout=10)
        resp = session.post(f"{c['base_url']}/GetStationList.php", timeout=10)
        stations = etree.HTML(resp.content).xpath('//option/@value')
        stations = [s for s in stations if s and str(s).strip()]

        for sid in stations:
            try:
                r = session.post(f"{c['base_url']}/getLastWeatherData.php", data=str(sid),
                                 headers={'Content-Type': 'text/plain'}, timeout=10)
                data = r.json()
                if not data:
                    add_error_to_db("82网站", sid, "返回 Null 数据")
                    continue

                latest = str(data.get('date', ['N/A'])[-1])
                status_msg = "当天已同步" if latest.startswith(today_fmt) else "数据滞后"
                # 82网站数据通常直接存为文件备查，记录入库
                add_error_to_db("82网站", sid, status_msg, latest)

                # 可选：将82网站的完整JSON也存入content
                # db.session.query(ErrorLog).filter_by(name=sid).update({"content": json.dumps(data, ensure_ascii=False)})

            except Exception as e:
                add_error_to_db("82网站", sid, f"请求异常: {str(e)}")
    except Exception as e:
        add_error_to_db("82网站", "初始化模块", str(e))


# --- 任务调度 ---

def background_worker():
    global is_running
    with app.app_context():
        try:
            # 1. 覆盖逻辑：清空旧数据
            ErrorLog.query.delete()
            db.session.commit()

            # 2. 执行爬虫
            run_106_logic()
            run_82_logic()

            # 3. 最终提交
            db.session.commit()
        except Exception as e:
            print(f"后台任务出错: {e}")
        finally:
            is_running = False


# --- API 路由 ---

@app.route('/api/run', methods=['POST'])
def trigger_run():
    global is_running
    if is_running:
        return jsonify({"message": "Task already running"}), 400
    is_running = True
    threading.Thread(target=background_worker).start()
    return jsonify({"message": "Task started"})


@app.route('/api/status', methods=['GET'])
def get_status():
    return jsonify({"is_running": is_running})


@app.route('/api/logs', methods=['GET'])
def get_logs():
    logs = ErrorLog.query.order_by(ErrorLog.source.desc()).all()
    return jsonify([{
        "source": l.source,
        "name": l.name,
        "reason": l.reason,
        "offset": l.offset,
        "latest_time": l.latest_time,
        "check_time": l.check_time,
        "content": l.content
    } for l in logs])


if __name__ == "__main__":
    # 使用 5000 端口，请确保前端 Vite 配置了正确的 Proxy
    app.run(host="0.0.0.0", port=5000, debug=True)