#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
通用 API 路由模組
包含：任務觸發、通知、歷史查詢、價格變動等 API
"""

import os
import threading
import importlib
from datetime import datetime, timezone, timedelta
from flask import Blueprint, request, jsonify
from sqlalchemy import func, desc

from auth import login_required
from config import BASE_DIR
from database.manager import DatabaseManager
from database.models import Product, PriceRecord
from database.edm_models import PromoProduct
from services.logger_manager import SystemLogger

# 時區設定
TAIPEI_TZ = timezone(timedelta(hours=8))

# Logger
sys_log = SystemLogger("APIRoutes").get_logger()

# Blueprint 定義
api_bp = Blueprint('api', __name__)


# ==========================================
# 任務觸發 API
# ==========================================

@api_bp.route('/api/run_task', methods=['POST'])
@login_required
def trigger_task():
    """API: 手動觸發 MOMO 爬蟲任務"""
    try:
        client_ip = request.remote_addr
        sys_log.info(f"[Web] [Task] 接收到手動執行請求 | IP: {client_ip}")

        # 使用獨立的 task_runner 服務，避免循環依賴
        from services.task_runner import run_momo_task_with_notification
        run_momo_task_with_notification()

        return jsonify({"status": "success", "message": "爬蟲任務已在背景啟動"})
    except Exception as e:
        sys_log.error(f"[Web] [Task] 手動觸發任務失敗 | Error: {e}")
        return jsonify({"status": "error", "message": str(e)}), 500


@api_bp.route('/api/run_edm_task', methods=['POST'])
@login_required
def trigger_edm_task():
    """API: 手動觸發 EDM 爬蟲任務"""
    try:
        target_lpn = "O1K5FBOqsvN"  # 預設活動代碼
        sys_log.info(f"[Web] [Task] 接收到手動 EDM 執行請求 | LPN: {target_lpn}")

        # 強制重載 scheduler 模組
        import scheduler
        importlib.reload(scheduler)

        # 使用執行緒啟動，避免卡住 Web Server
        task_thread = threading.Thread(target=scheduler.run_edm_task, args=(target_lpn,))
        task_thread.daemon = True
        task_thread.start()

        return jsonify({"status": "success", "message": f"EDM 爬蟲任務 (LPN: {target_lpn}) 已在背景啟動，請稍後刷新頁面查看結果"})
    except Exception as e:
        sys_log.error(f"[Web] [Task] 手動觸發 EDM 任務失敗 | Error: {e}")
        return jsonify({"status": "error", "message": str(e)}), 500


@api_bp.route('/api/run_festival_task', methods=['POST'])
@login_required
def trigger_festival_task():
    """API: 手動觸發 1.1 狂歡購物節爬蟲任務"""
    try:
        target_lpn = "O7ylWfihYUM"
        sys_log.info(f"[Web] [Task] 接收到手動 Festival 執行請求 | LPN: {target_lpn}")

        # 延遲導入
        import scheduler
        importlib.reload(scheduler)

        # 使用執行緒啟動，避免卡住 Web Server
        task_thread = threading.Thread(target=scheduler.run_festival_task, args=(target_lpn,))
        task_thread.daemon = True
        task_thread.start()

        return jsonify({"status": "success", "message": f"Festival 爬蟲任務 (LPN: {target_lpn}) 已在背景啟動，請稍後刷新頁面查看結果"})
    except Exception as e:
        sys_log.error(f"[Web] [Task] 手動觸發 Festival 任務失敗 | Error: {e}")
        return jsonify({"status": "error", "message": str(e)}), 500


# ==========================================
# 通知 API
# ==========================================

@api_bp.route('/api/trigger_momo_notification', methods=['POST'])
@login_required
def trigger_momo_notification():
    """API: 手動觸發商品看板通知"""
    try:
        # 強制重載通知模組
        import scheduler
        import services.notification_manager
        importlib.reload(scheduler)
        importlib.reload(services.notification_manager)
        from services.notification_manager import NotificationManager

        # 從 dashboard_routes 導入 get_dashboard_stats，避免循環依賴
        from routes.dashboard_routes import get_dashboard_stats

        # 1. 取得統計數據
        stats = get_dashboard_stats()

        # 2. 截取儀表板畫面
        dashboard_url = "http://127.0.0.1/"
        screenshot_path = scheduler.capture_page_screenshot(dashboard_url, "momo_dashboard")

        # 3. 發送通知
        notifier = NotificationManager()
        sys_log.info(f"[Web] [Notification] 手動觸發 MOMO 通知")
        notifier.send_momo_report(stats, screenshot_path)

        return jsonify({"status": "success", "message": "已發送商品看板通知"})
    except Exception as e:
        sys_log.error(f"[Web] [Notification] 手動通知失敗 | Error: {e}")
        return jsonify({"status": "error", "message": str(e)}), 500


@api_bp.route('/api/trigger_edm_notification', methods=['POST'])
@login_required
def trigger_edm_notification():
    """API: 手動觸發 EDM 比價通知 (不重爬，僅重發)"""
    try:
        # 強制重新載入設定與通知模組
        import config
        import services.notification_manager
        import services.edm_notifier
        importlib.reload(config)
        importlib.reload(services.notification_manager)
        importlib.reload(services.edm_notifier)

        db = DatabaseManager()
        session = db.get_session()
        try:
            # 找出最新的 batch_id
            latest_batch_tuple = session.query(PromoProduct.batch_id).filter(
                PromoProduct.page_type == 'edm'
            ).order_by(desc(PromoProduct.crawled_at)).first()

            if not latest_batch_tuple:
                return jsonify({"status": "warning", "message": "目前無 EDM 商品資料，請先執行爬蟲"}), 400

            latest_batch_id = latest_batch_tuple[0]

            # 取得最新批次的所有異動商品
            products = session.query(PromoProduct).filter(
                PromoProduct.batch_id == latest_batch_id
            ).all()

            if not products:
                return jsonify({"status": "info", "message": "最新一輪掃描中無任何商品異動"}), 200

            # 嘗試尋找對應的截圖檔案
            screenshot_path = None
            try:
                filename = f"edm_{latest_batch_id}.png"
                potential_path = os.path.join(BASE_DIR, 'web/static/screenshots', filename)
                if os.path.exists(potential_path):
                    screenshot_path = potential_path
            except Exception:
                pass

            from services.edm_notifier import EdmNotifier
            notifier = EdmNotifier()
            sys_log.info(f"[Web] [Notification] 手動觸發 EDM 通知 | Count: {len(products)} | BatchID: {latest_batch_id}")
            notifier.send_edm_report(products, screenshot_path)

            return jsonify({"status": "success", "message": f"已針對最新批次的 {len(products)} 筆商品異動發送通知"})
        finally:
            session.close()
    except Exception as e:
        sys_log.error(f"[Web] [Notification] 手動通知失敗 | Error: {e}")
        return jsonify({"status": "error", "message": str(e)}), 500


@api_bp.route('/api/test_notification', methods=['POST'])
@login_required
def test_notification():
    """API: 測試訊息通知功能"""
    try:
        from services.notification_manager import NotificationManager
        import config
        import requests
        notifier = NotificationManager()

        sys_log.info("[Web] [Notification] 執行手動通知發送測試 (Line/Telegram/Email)...")

        token = getattr(config, 'LINE_CHANNEL_ACCESS_TOKEN', None)
        target_id = getattr(config, 'LINE_GROUP_ID', None)

        if token and target_id:
            sys_log.info(f"[Web] [Notification] 偵測到 Channel Token: {token[:4]}...{token[-4:]}")
            sys_log.info(f"[Web] [Notification] 目標 ID: {target_id}")

            # 嘗試直接發送請求
            try:
                headers = {
                    "Authorization": f"Bearer {token}",
                    "Content-Type": "application/json"
                }
                payload = {
                    "to": target_id,
                    "messages": [
                        {
                            "type": "text",
                            "text": "這是系統診斷測試訊息 (Messaging API)\n\n連線測試成功！"
                        }
                    ]
                }

                sys_log.info("[Web] [Notification] 正在嘗試連線至 Line Messaging API (push)...")
                resp = requests.post("https://api.line.me/v2/bot/message/push", headers=headers, json=payload, timeout=10)

                sys_log.info(f"[Web] [Notification] Line API 回應 | Code: {resp.status_code}")
                sys_log.info(f"[Web] [Notification] Line API 內容 | Body: {resp.text}")

                if resp.status_code != 200:
                    return jsonify({"status": "error", "message": f"Line API 拒絕連線: {resp.status_code} - {resp.text}"}), 400
            except Exception as req_err:
                sys_log.error(f"[Web] [Notification] 直接連線測試發生異常 | Error: {req_err}")
                return jsonify({"status": "error", "message": f"連線異常: {req_err}"}), 500
        else:
            sys_log.warning("[Web] [Notification] 無法偵測到 Messaging API 設定 (Token 或 Group ID 缺失)")
            return jsonify({"status": "error", "message": "設定檔缺少 LINE_CHANNEL_ACCESS_TOKEN 或 LINE_GROUP_ID"}), 400

        # 呼叫真實的日報發送邏輯
        notifier.send_daily_report()

        return jsonify({"status": "success", "message": "當日異動通知已發送 (Line/Telegram/Email)"})
    except ImportError:
        return jsonify({"status": "error", "message": "找不到 NotificationManager 模組"}), 500
    except Exception as e:
        sys_log.error(f"[Web] [Notification] 測試通知失敗 | Error: {e}")
        return jsonify({"status": "error", "message": f"發送失敗: {str(e)}"}), 500


# ==========================================
# 歷史查詢 API
# ==========================================

@api_bp.route('/api/history/<int:product_id>')
@login_required
def get_price_history(product_id):
    """API: 取得商品過去 180 天的價格歷史"""
    db = DatabaseManager()
    session = db.get_session()
    try:
        # 計算 180 天前的日期 (保持台北時區)
        start_date = datetime.now(TAIPEI_TZ) - timedelta(days=180)

        records = session.query(PriceRecord).filter(
            PriceRecord.product_id == product_id,
            PriceRecord.timestamp >= start_date
        ).order_by(PriceRecord.timestamp).all()

        data = [{
            't': r.timestamp.strftime('%Y-%m-%d %H:%M'),
            'p': r.price
        } for r in records]

        return jsonify(data)
    except Exception as e:
        sys_log.error(f"[Web] [History] 獲取歷史價格失敗 | ProductID: {product_id} | Error: {e}")
        return jsonify([]), 500
    finally:
        session.close()


@api_bp.route('/api/price_change_details')
@login_required
def get_price_change_details():
    """API: 取得價格變動商品明細 (供彈窗使用)"""
    filter_type = request.args.get('type', '')
    # 以下參數保留以供未來擴展
    # filter_category = request.args.get('category', '')
    # filter_product_id = request.args.get('product_id', '')

    db = DatabaseManager()
    session = db.get_session()
    try:
        # 取得今日起始時間
        now_taipei = datetime.now(TAIPEI_TZ)
        today_start = now_taipei.replace(hour=0, minute=0, second=0, microsecond=0, tzinfo=None)

        # 基礎查詢：取得所有商品的最新記錄
        latest_records_subq = session.query(
            func.max(PriceRecord.id).label('max_id')
        ).group_by(PriceRecord.product_id).subquery()

        query = session.query(PriceRecord, Product).join(
            latest_records_subq,
            PriceRecord.id == latest_records_subq.c.max_id
        ).join(Product, PriceRecord.product_id == Product.id)

        # 一次性查詢所有商品的「今日之前最後價格」
        product_ids = [r[0] for r in session.query(PriceRecord.product_id).join(
            latest_records_subq, PriceRecord.id == latest_records_subq.c.max_id
        ).all()]

        yesterday_prices_subq = session.query(
            PriceRecord.product_id,
            func.max(PriceRecord.id).label('max_id')
        ).filter(
            PriceRecord.product_id.in_(product_ids),
            PriceRecord.timestamp < today_start
        ).group_by(PriceRecord.product_id).subquery()

        yesterday_prices_q = session.query(
            PriceRecord.product_id, PriceRecord.price
        ).join(
            yesterday_prices_subq,
            PriceRecord.id == yesterday_prices_subq.c.max_id
        )
        yesterday_prices_map = {pid: price for pid, price in yesterday_prices_q}

        # 根據 filter_type 進行篩選
        products = []

        if filter_type == 'increase':
            # 漲價商品
            for record, product in query.all():
                old_price = yesterday_prices_map.get(product.id)
                if old_price is not None and record.price > old_price:
                    products.append({
                        'product_id': product.i_code,
                        'name': product.name,
                        'category': product.category,
                        'url': product.url,
                        'image_url': product.image_url or '/static/placeholder.png',
                        'old_price': old_price,
                        'current_price': record.price,
                        'change': record.price - old_price,
                        'update_time': record.timestamp.strftime('%Y-%m-%d %H:%M')
                    })

        elif filter_type == 'decrease':
            # 降價商品
            for record, product in query.all():
                old_price = yesterday_prices_map.get(product.id)
                if old_price is not None and record.price < old_price:
                    products.append({
                        'product_id': product.i_code,
                        'name': product.name,
                        'category': product.category,
                        'url': product.url,
                        'image_url': product.image_url or '/static/placeholder.png',
                        'old_price': old_price,
                        'current_price': record.price,
                        'change': record.price - old_price,
                        'update_time': record.timestamp.strftime('%Y-%m-%d %H:%M')
                    })

        elif filter_type == 'delisted':
            # 下架商品 (今日狀態為 INACTIVE 且今天更新的)
            today_delisted = session.query(Product).filter(
                Product.status == 'INACTIVE',
                Product.updated_at >= today_start
            ).all()

            for product in today_delisted:
                last_record = session.query(PriceRecord).filter(
                    PriceRecord.product_id == product.id
                ).order_by(PriceRecord.timestamp.desc()).first()

                if last_record:
                    products.append({
                        'product_id': product.i_code,
                        'name': product.name,
                        'category': product.category,
                        'url': product.url,
                        'image_url': product.image_url or '/static/placeholder.png',
                        'last_price': last_record.price,
                        'update_time': product.updated_at.strftime('%Y-%m-%d %H:%M') if product.updated_at else ''
                    })

        return jsonify({'products': products})

    except Exception as e:
        sys_log.error(f"[Web] [PriceChange] 獲取價格變動明細失敗 | Error: {e}")
        return jsonify({'products': []}), 500
    finally:
        session.close()