"""
日报生成核心逻辑
"""
import os
import json
from datetime import datetime, timedelta
from openpyxl import Workbook
from openpyxl.styles import Font, Alignment, PatternFill
import pytz

from lib.db import execute_query, execute_insert
from lib.field_mapping import get_field_display_name


def get_beijing_time():
    """获取北京时间"""
    beijing_tz = pytz.timezone('Asia/Shanghai')
    return datetime.now(beijing_tz)


def generate_daily_report(config_id, start_time=None, end_time=None):
    """
    生成日报
    
    Args:
        config_id: 配置ID
        start_time: 开始时间（可选，默认为昨天8点）
        end_time: 结束时间（可选，默认为今天8点）
    
    Returns:
        dict: 生成结果，包含 success, message, file_path, total_orders, total_amount, sum_results
    """
    try:
        # 获取配置信息
        configs = execute_query(
            'SELECT * FROM t_daily_report_config WHERE id = %s',
            (config_id,)
        )
        
        if not configs:
            return {'success': False, 'message': '配置不存在'}
        
        config = configs[0]
        
        # 解析字段
        selected_fields = json.loads(config['selected_fields'])
        sum_fields = json.loads(config['sum_fields']) if config['sum_fields'] else []
        
        # 设置时间范围
        if not start_time or not end_time:
            now = get_beijing_time()
            end_time = now.replace(hour=8, minute=0, second=0, microsecond=0)
            start_time = end_time - timedelta(days=1)
        
        # 格式化时间
        start_time_str = start_time.strftime('%Y-%m-%d %H:%M:%S')
        end_time_str = end_time.strftime('%Y-%m-%d %H:%M:%S')
        
        print(f"[日报生成] 开始生成日报")
        print(f"  配置ID: {config_id}")
        print(f"  配置名称: {config['config_name']}")
        print(f"  拆分方式: {config['split_type']} = {config['split_value']}")
        print(f"  时间范围: {start_time_str} 至 {end_time_str}")
        print(f"  选择字段: {len(selected_fields)} 个")
        
        # 构建查询SQL
        fields_str = ', '.join(selected_fields)
        sql = f"""
            SELECT {fields_str}
            FROM t_equipment_charge_order
            WHERE state = 3
            AND report_time >= %s
            AND report_time < %s
            AND {config['split_type']} = %s
            ORDER BY report_time DESC
        """
        
        # 执行查询
        orders = execute_query(sql, (start_time_str, end_time_str, config['split_value']))
        
        print(f"[日报生成] 查询到 {len(orders)} 条订单")
        
        if not orders:
            # 即使没有数据，也保存一条失败记录
            save_report_history(
                report_date=start_time.strftime('%Y-%m-%d'),
                start_time=start_time_str,
                end_time=end_time_str,
                split_type=config['split_type'],
                split_value=config['split_value'],
                split_name=config.get('split_name', config['split_value']),
                config_id=config_id,
                total_orders=0,
                total_amount=0,
                sum_results={},
                file_path='',
                status=0
            )
            return {
                'success': False,
                'message': f'时间范围内没有符合条件的订单数据（查询条件：{start_time_str} 至 {end_time_str}，{config["split_type"]}={config["split_value"]}，state=3）'
            }
        
        # 计算求和
        sum_results = {}
        for field in sum_fields:
            if field in orders[0]:
                total = sum(float(order.get(field, 0) or 0) for order in orders)
                sum_results[field] = total
        
        # 生成Excel文件
        file_path = generate_excel(
            orders=orders,
            selected_fields=selected_fields,
            sum_fields=sum_fields,
            sum_results=sum_results,
            config_name=config['config_name'],
            split_name=config.get('split_name', config['split_value']),
            start_time=start_time_str,
            end_time=end_time_str
        )
        
        print(f"[日报生成] Excel文件已生成: {file_path}")
        
        # 计算总金额
        total_amount = sum(float(order.get('total_money', 0) or 0) for order in orders)
        
        # 保存历史记录
        print(f"[日报生成] 准备保存历史记录，file_path={file_path}")
        history_id = save_report_history(
            report_date=start_time.strftime('%Y-%m-%d'),
            start_time=start_time_str,
            end_time=end_time_str,
            split_type=config['split_type'],
            split_value=config['split_value'],
            split_name=config.get('split_name', config['split_value']),
            config_id=config_id,
            total_orders=len(orders),
            total_amount=total_amount,
            sum_results=sum_results,
            file_path=file_path,
            status=1
        )
        print(f"[日报生成] 历史记录已保存，ID={history_id}")
        
        print(f"[日报生成] ✓ 生成成功")
        print(f"  订单数量: {len(orders)}")
        print(f"  总金额: {total_amount}")
        print(f"  文件路径: {file_path}")
        print(f"  历史记录ID: {history_id}")
        
        return {
            'success': True,
            'message': '日报生成成功',
            'file_path': file_path,
            'total_orders': len(orders),
            'total_amount': total_amount,
            'sum_results': sum_results,
            'history_id': history_id
        }
        
    except Exception as e:
        print(f"[日报生成] ✗ 生成失败: {str(e)}")
        import traceback
        traceback.print_exc()
        
        # 保存失败记录
        try:
            save_report_history(
                report_date=start_time.strftime('%Y-%m-%d') if start_time else datetime.now().strftime('%Y-%m-%d'),
                start_time=start_time_str if 'start_time_str' in locals() else '',
                end_time=end_time_str if 'end_time_str' in locals() else '',
                split_type=config['split_type'] if 'config' in locals() and config else '',
                split_value=config['split_value'] if 'config' in locals() and config else '',
                split_name=config.get('split_name', '') if 'config' in locals() and config else '',
                config_id=config_id,
                total_orders=0,
                total_amount=0,
                sum_results={},
                file_path='',
                status=0
            )
            print(f"[日报生成] 已保存失败记录到历史表")
        except Exception as save_error:
            print(f"[日报生成] 保存失败记录时出错: {str(save_error)}")
        
        return {
            'success': False,
            'message': f'生成日报失败: {str(e)}'
        }


def generate_excel(orders, selected_fields, sum_fields, sum_results, 
                   config_name, split_name, start_time, end_time):
    """
    生成Excel文件
    
    Returns:
        str: 文件路径
    """
    # 创建reports目录
    reports_dir = os.path.join(os.path.dirname(os.path.dirname(__file__)), 'public', 'reports')
    os.makedirs(reports_dir, exist_ok=True)
    
    # 生成文件名
    timestamp = datetime.now().strftime('%Y%m%d_%H%M%S')
    filename = f'daily_report_{config_name}_{split_name}_{timestamp}.xlsx'
    file_path = os.path.join(reports_dir, filename)
    
    # 创建工作簿
    wb = Workbook()
    ws = wb.active
    ws.title = '日报'
    
    # 写入标题
    ws.merge_cells(start_row=1, start_column=1, end_row=1, end_column=len(selected_fields))
    title_cell = ws.cell(row=1, column=1)
    title_cell.value = f'{config_name} - {split_name} 日报'
    title_cell.font = Font(size=16, bold=True)
    title_cell.alignment = Alignment(horizontal='center')
    
    # 写入时间范围
    ws.merge_cells(start_row=2, start_column=1, end_row=2, end_column=len(selected_fields))
    time_cell = ws.cell(row=2, column=1)
    time_cell.value = f'统计时间: {start_time} 至 {end_time}'
    time_cell.alignment = Alignment(horizontal='center')
    
    # 写入表头（中文）
    header_row = 4
    for col_idx, field in enumerate(selected_fields, 1):
        cell = ws.cell(row=header_row, column=col_idx)
        cell.value = get_field_display_name(field)
        cell.font = Font(bold=True)
        cell.fill = PatternFill(start_color='D3D3D3', end_color='D3D3D3', fill_type='solid')
        cell.alignment = Alignment(horizontal='center')
    
    # 写入数据
    for row_idx, order in enumerate(orders, header_row + 1):
        for col_idx, field in enumerate(selected_fields, 1):
            cell = ws.cell(row=row_idx, column=col_idx)
            value = order.get(field, '')
            
            # 格式化时间字段
            if field in ['report_time', 'start_time', 'end_time', 'create_time', 'update_time', 'pay_time']:
                if isinstance(value, datetime):
                    value = value.strftime('%Y-%m-%d %H:%M:%S')
            
            cell.value = value
    
    # 写入求和行
    if sum_fields:
        sum_row = header_row + len(orders) + 1
        ws.cell(row=sum_row, column=1).value = '合计'
        ws.cell(row=sum_row, column=1).font = Font(bold=True)
        
        for col_idx, field in enumerate(selected_fields, 1):
            if field in sum_fields and field in sum_results:
                cell = ws.cell(row=sum_row, column=col_idx)
                cell.value = sum_results[field]
                cell.font = Font(bold=True)
                cell.number_format = '0.00'
    
    # 调整列宽
    for col_idx, field in enumerate(selected_fields, 1):
        max_length = len(get_field_display_name(field))
        for row in ws.iter_rows(min_row=header_row + 1, max_row=header_row + len(orders), 
                               min_col=col_idx, max_col=col_idx):
            for cell in row:
                if cell.value:
                    max_length = max(max_length, len(str(cell.value)))
        ws.column_dimensions[ws.cell(row=1, column=col_idx).column_letter].width = min(max_length + 2, 50)
    
    # 保存文件
    wb.save(file_path)
    
    # 返回相对路径
    return f'/reports/{filename}'


def save_report_history(report_date, start_time, end_time, split_type, split_value, 
                        split_name, config_id, total_orders, total_amount, 
                        sum_results, file_path, status):
    """
    保存日报生成历史记录
    
    Returns:
        int: 历史记录ID
    """
    # 生成ID
    history_id = int(datetime.now().timestamp() * 1000)
    
    print(f"[保存历史] 准备保存历史记录")
    print(f"  ID: {history_id}")
    print(f"  file_path: '{file_path}'")
    print(f"  status: {status}")
    
    sql = """
        INSERT INTO t_daily_report_history 
        (id, report_date, start_time, end_time, split_type, split_value, split_name, 
         config_id, total_orders, total_amount, sum_results, file_path, status, create_time)
        VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, NOW())
    """
    
    params = (
        history_id,
        report_date,
        start_time,
        end_time,
        split_type,
        split_value,
        split_name,
        config_id,
        total_orders,
        total_amount,
        json.dumps(sum_results, ensure_ascii=False),
        file_path,
        status
    )
    
    print(f"[保存历史] 执行SQL插入...")
    result = execute_insert(sql, params)
    print(f"[保存历史] 插入完成，返回ID: {result}")
    
    return history_id