# flask_app/routes/get_deviation.py

from flask import Blueprint, request, jsonify, Response, stream_with_context, g
import json
import os
from flask_app.main.download import download_file
from flask_app.general.post_processing import outer_post_processing
from flask_app.general.接口_技术偏离表 import get_tech_and_business_deviation

from flask_app.logger_setup import CSTFormatter

from flask_app.routes.utils import generate_deviation_response, validate_request

get_deviation_bp = Blueprint('get_deviation', __name__)
@get_deviation_bp.route('/get_deviation', methods=['POST'])
def get_deviation():
    logger = g.logger
    unique_id = g.unique_id
    validation = validate_request()

    if isinstance(validation, tuple) and len(validation) == 2 and isinstance(validation[0], str):
        file_url, zb_type = validation
    else:
        return validation  # 错误响应

    try:
        logger.info("开始解析 URL: " + file_url)
        if zb_type != 2:
            logger.error(f"无效的 zb_type: {zb_type}. 期望 zb_type: 2")
            return jsonify({
                'error': 'Invalid zb_type',
                'message': '此端点仅支持 zb_type 2 (采购需求)'
            }), 400
        else:
            tech_deviation, tech_star_deviation, business_deviation, business_star_deviation, zigefuhe_deviation = download_and_process_file_for_deviation(
                file_url, unique_id)
            if tech_deviation is None:
                return jsonify({'error': 'File processing failed'}), 500
            tech_deviation_response, tech_deviation_star_response, zigefuhe_deviation_response, shangwu_deviation_response, shangwu_star_deviation_response = generate_deviation_response(
                tech_deviation, tech_star_deviation, business_deviation, business_star_deviation, zigefuhe_deviation,
                logger)

            final_response = {
                'message': 'processed successfully',
                'filename': 'END',
                'data': 'END'
            }

            @stream_with_context
            def generate():
                yield f"data: {json.dumps(tech_deviation_response, ensure_ascii=False)}\n\n"
                yield f"data: {json.dumps(tech_deviation_star_response, ensure_ascii=False)}\n\n"
                yield f"data: {json.dumps(zigefuhe_deviation_response, ensure_ascii=False)}\n\n"
                yield f"data: {json.dumps(shangwu_deviation_response, ensure_ascii=False)}\n\n"
                yield f"data: {json.dumps(shangwu_star_deviation_response, ensure_ascii=False)}\n\n"
                yield f"data: {json.dumps(final_response, ensure_ascii=False)}\n\n"

            return Response(generate(), mimetype='text/event-stream')
    except Exception as e:
        logger.error('发生异常: ' + str(e))
        return jsonify({'error': str(e)}), 500


def download_and_process_file_for_deviation(file_url, unique_id):
    """
    下载并处理采购需求文件。

    参数:
        file_url (str): 文件的URL地址。

    返回:
        tuple: (tech_deviation, tech_star_deviation, business_deviation, business_star_deviation, zigefuhe_deviation)
    """
    logger = g.logger
    output_folder = g.output_folder
    filename = "ztbfile"
    downloaded_filename = os.path.join(output_folder, filename)
    downloaded_filepath, file_type = download_file(file_url, downloaded_filename)
    if downloaded_filepath is None or file_type == 4:
        logger.error("Unsupported file type or failed to download file")
        return None, None, None, None, None
    logger.info("Local file path: " + downloaded_filepath)
    tech_deviation, tech_star_deviation, business_deviation, business_star_deviation, zigefuhe_deviation = get_tech_and_business_deviation(
        downloaded_filepath, file_type, unique_id, output_folder)
    return tech_deviation, tech_star_deviation, business_deviation, business_star_deviation, zigefuhe_deviation