import os
import io
import sys
import json
import mimetypes
import logging
from datetime import datetime
import pytz

from flask import Flask, send_from_directory, jsonify
from flask_cors import CORS
from flask_apscheduler import APScheduler

# ==============================================================================
# ✅ 0. 控制台编码兜底（必须最先执行）
# ==============================================================================
# 保留原始流引用，防止被 GC 回收时连带关闭底层 buffer
_CONSOLE_ORIGINALS = []


def _force_utf8_console():
    """
    强制 stdout/stderr 以 UTF-8 输出，防止 Windows GBK 终端下 emoji 崩溃。

    Windows 中文控制台默认 cp936(GBK)，而本应用（app.py / services.core /
    crawler_106 / crawler_82）大量使用 emoji 打印日志。一旦 print 抛
    UnicodeEncodeError，异常会落进采集任务的 try 块，导致整个事务被 rollback
    并报"数据写入失败" —— 表现就是定时采集长期静默不落库。
    """
    for name in ('stdout', 'stderr'):
        stream = getattr(sys, name, None)
        # PyInstaller --noconsole 或输出重定向时，stream 或其 buffer 可能不存在
        if stream is None or not hasattr(stream, 'buffer'):
            continue
        enc = (getattr(stream, 'encoding', None) or '').lower().replace('-', '')
        if enc == 'utf8':
            continue
        # 替换前先 flush：否则旧流缓冲区里尚未写出的内容会随旧对象一起丢掉
        try:
            stream.flush()
        except Exception:
            pass
        _CONSOLE_ORIGINALS.append(stream)
        setattr(sys, name, io.TextIOWrapper(stream.buffer, encoding='utf-8', errors='replace'))


_force_utf8_console()

# ==============================================================================
# ✅ 1. 核心模块引用
# ==============================================================================
try:
    from config import Config
    from extensions import db
    from models import Device, DeviceHistory
    # 引入核心爬虫调度
    from services.core import execute_monitor_task
    # 引入统一入库管道
    from services.db_ingest import ingest_device_data

    try:
        from services.iot_api import sync_iot_data_service
    except ImportError:
        sync_iot_data_service = None

    try:
        from routes.api import api_bp as device_bp
        from routes.api import calculate_offset
    except ImportError:
        # 兜底逻辑，防止缺失 calculate_offset 导致崩溃
        def calculate_offset(target_time):
            return 0


        from routes.api import device_bp

except ImportError as e:
    print(f"❌ [启动错误] 模块导入失败: {e}")
    sys.exit(1)

# ==============================================================================
# 2. 智能路径配置
# ==============================================================================
RESOURCE_BASE = Config.BASE_DIR
INSTANCE_PATH = Config.INSTANCE_DIR


def find_static_folder(base_path):
    """
    全能路径搜寻逻辑，适配 PyInstaller 打包环境
    """
    if getattr(sys, 'frozen', False):
        if hasattr(sys, '_MEIPASS'):
            mei_path = os.path.join(sys._MEIPASS, 'web_dist')
            if os.path.exists(os.path.join(mei_path, 'index.html')):
                return mei_path
        internal_path = os.path.join(base_path, '_internal', 'web_dist')
        if os.path.exists(os.path.join(internal_path, 'index.html')):
            return internal_path

    path = os.path.join(base_path, 'web_dist')
    if os.path.exists(os.path.join(path, 'index.html')):
        return path

    parent_path = os.path.join(os.path.dirname(base_path), 'web_dist')
    if os.path.exists(os.path.join(parent_path, 'index.html')):
        return parent_path
    return path


STATIC_FOLDER = find_static_folder(RESOURCE_BASE)
mimetypes.add_type('application/javascript', '.js')
mimetypes.add_type('text/css', '.css')


# ==============================================================================
# 3. 核心定时任务逻辑 (深度优化版)
# ==============================================================================
def auto_monitor_job(app):
    """
    每天的定时采集任务。

    入库细节全部收敛到 services.db_ingest.ingest_device_data，本函数只负责：
    建立应用上下文 -> 触发爬虫 -> 调用入库管道 -> 提交事务。
    """
    with app.app_context():
        # 强制清理会话，确保线程获取的是全新的数据库连接
        db.session.remove()

        tz = pytz.timezone('Asia/Shanghai')
        now_str = datetime.now(tz).strftime('%Y-%m-%d %H:%M:%S')

        print(f"\n{'=' * 50}")
        print(f"⏰ [定时任务启动] {now_str}")

        if not execute_monitor_task:
            print("❌ 错误: execute_monitor_task 未定义")
            return

        try:
            task_result = execute_monitor_task()

            if not task_result:
                print("⚠️ [警告] 爬虫执行完毕，但返回空数据")
                return

            scraped_list = task_result.get('device_list', [])
            print(f"📦 [数据获取] 爬取到 {len(scraped_list)} 条设备数据")

            updated, history = ingest_device_data(scraped_list)

            db.session.commit()
            print(f"✅ [入库成功] 设备更新: {updated} | 历史追加: {history}")

        except Exception as e:
            db.session.rollback()
            print(f"❌ [严重异常] 数据写入失败: {e}")
            import traceback
            traceback.print_exc()
        finally:
            # 再次清理 Session，防止内存泄漏或污染下一次任务
            db.session.remove()
            print(f"{'=' * 50}\n")


# ==============================================================================
# 4. Flask 应用工厂
# ==============================================================================
def create_app():
    print(f"🔍 [前端路径锁定] {STATIC_FOLDER}")

    app = Flask(__name__, static_folder=STATIC_FOLDER, instance_path=INSTANCE_PATH)
    CORS(app)

    if not os.path.exists(app.instance_path):
        os.makedirs(app.instance_path, exist_ok=True)

    app.config.from_object(Config)

    # 初始化 DB
    db.init_app(app)

    # 初始化调度器
    scheduler = APScheduler()
    scheduler.init_app(app)
    scheduler.start()

    # --- 添加定时任务 ---
    # 注意：这里我们传递 [app] 作为参数，确保 job 函数内能获取到 app 上下文
    scheduler.add_job(
        id='daily_monitor_task',
        func=auto_monitor_job,
        args=[app],
        trigger='cron',
        hour=17,
        minute=00,
        second=00,
        misfire_grace_time=3600,
        timezone=pytz.timezone('Asia/Shanghai')
    )
    print(f"📅 定时任务已锁定: 每天北京时间 17:00 执行")

    app.register_blueprint(device_bp)

    @app.route('/api/force_run')
    def force_run_task():
        """手动触发接口：复用同一个 auto_monitor_job 函数，确保逻辑一致"""
        auto_monitor_job(app)
        return jsonify({'code': 200, 'msg': '手动触发成功，请查看服务器日志'})

    @app.route('/')
    def serve_index():
        try:
            return send_from_directory(app.static_folder, 'index.html')
        except Exception:
            return "Frontend Error", 404

    @app.route('/<path:path>')
    def serve_static(path):
        if path.startswith('api'):
            return jsonify({'code': 404, 'message': 'API endpoint not found'}), 404

        file_path = os.path.join(app.static_folder, path)
        if os.path.exists(file_path):
            return send_from_directory(app.static_folder, path)

        return send_from_directory(app.static_folder, 'index.html')

    with app.app_context():
        db.create_all()

    return app


if __name__ == '__main__':
    app = create_app()
    debug_mode = not getattr(sys, 'frozen', False)

    print(f"🚀 服务启动中... 数据库: {app.config['SQLALCHEMY_DATABASE_URI']}")
    # 注意：use_reloader=False 防止调度器在 Debug 模式下运行两次
    app.run(host='0.0.0.0', port=5000, debug=debug_mode, use_reloader=False)