"""Export API routes for Excel report generation."""
from flask import request, send_file
from flask_restx import Namespace, Resource, fields
from app.services.export_service import ExportService
from app.utils.auth_decorator import require_auth

export_ns = Namespace('export', description='Excel导出接口')

# Response models for Swagger documentation
error_response = export_ns.model('ExportErrorResponse', {
    'success': fields.Boolean(description='操作是否成功'),
    'error': fields.String(description='错误信息'),
    'code': fields.String(description='错误代码')
})


@export_ns.route('/monthly')
class MonthlyExport(Resource):
    """Resource for monthly Excel export."""
    
    @export_ns.doc('export_monthly')
    @export_ns.param('year', '年份 (例如: 2024)', required=True, type=int)
    @export_ns.param('month', '月份 (1-12)', required=True, type=int)
    @export_ns.response(200, 'Excel文件下载')
    @export_ns.response(400, '参数错误', error_response)
    @export_ns.response(500, '服务器错误', error_response)
    @export_ns.produces(['application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'])
    @require_auth
    def get(self):
        """导出月度工作报表Excel
        
        生成包含以下内容的Excel文件:
        - 明细表: 人员、日期、物品、单价、数量、总价
        - 月度汇总: 每人总金额及合计
        """
        # Get and validate parameters
        year = request.args.get('year', type=int)
        month = request.args.get('month', type=int)
        
        if year is None:
            return {
                'success': False,
                'error': 'Year parameter is required',
                'code': 'VALIDATION_ERROR'
            }, 400
        
        if month is None:
            return {
                'success': False,
                'error': 'Month parameter is required',
                'code': 'VALIDATION_ERROR'
            }, 400
        
        try:
            excel_file, error = ExportService.export_monthly(year, month)
            
            if error:
                return {
                    'success': False,
                    'error': error,
                    'code': 'VALIDATION_ERROR'
                }, 400
            
            filename = f'work_report_{year}_{month:02d}.xlsx'
            
            return send_file(
                excel_file,
                mimetype='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
                as_attachment=True,
                download_name=filename
            )
        except Exception as e:
            return {
                'success': False,
                'error': f'Failed to generate Excel: {str(e)}',
                'code': 'SERVER_ERROR'
            }, 500


@export_ns.route('/yearly')
class YearlyExport(Resource):
    """Resource for yearly Excel export."""
    
    @export_ns.doc('export_yearly')
    @export_ns.param('year', '年份 (例如: 2024)', required=True, type=int)
    @export_ns.response(200, 'Excel文件下载')
    @export_ns.response(400, '参数错误', error_response)
    @export_ns.response(500, '服务器错误', error_response)
    @export_ns.produces(['application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'])
    @require_auth
    def get(self):
        """导出年度工作报表Excel
        
        生成包含以下内容的Excel文件:
        - 明细表: 人员、日期、物品、单价、数量、总价
        - 年度汇总: 每人按月统计及年度合计
        """
        # Get and validate parameters
        year = request.args.get('year', type=int)
        
        if year is None:
            return {
                'success': False,
                'error': 'Year parameter is required',
                'code': 'VALIDATION_ERROR'
            }, 400
        
        try:
            excel_file, error = ExportService.export_yearly(year)
            
            if error:
                return {
                    'success': False,
                    'error': error,
                    'code': 'VALIDATION_ERROR'
                }, 400
            
            filename = f'work_report_{year}.xlsx'
            
            return send_file(
                excel_file,
                mimetype='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
                as_attachment=True,
                download_name=filename
            )
        except Exception as e:
            return {
                'success': False,
                'error': f'Failed to generate Excel: {str(e)}',
                'code': 'SERVER_ERROR'
            }, 500