from fastapi import APIRouter, File, UploadFile
from fastapi.responses import JSONResponse, FileResponse
from fastapi.exceptions import HTTPException
from werkzeug.utils import secure_filename
from app.utils.excelmerge.conformity import run_conformity
from pathlib import Path
import subprocess
import shutil
import os


router = APIRouter()

ALLOWED_EXTENSIONS = {'xlsx'}
EXCEL_FILES_PATH = 'data/output'
SOURCE_FILES_PATH = 'data/source'
output_path_value = None


def allowed_file(filename):
    return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS


def create_dir_if_not_exists(path):
    if not os.path.exists(path):
        os.makedirs(path)


@router.post('/excel/upload')
async def upload_file(files: list[UploadFile] = File(...)):
    if not any(file.filename for file in files):
        return JSONResponse(content={"error": "没有文件部分"}, status_code=400)

    create_dir_if_not_exists(SOURCE_FILES_PATH)

    # 清空SOURCE_FILES_PATH目录
    for filename in os.listdir(SOURCE_FILES_PATH):
        file_path = os.path.join(SOURCE_FILES_PATH, filename)
        try:
            if os.path.isfile(file_path) or os.path.islink(file_path):
                os.unlink(file_path)
            elif os.path.isdir(file_path):
                shutil.rmtree(file_path)
        except Exception as e:
            return JSONResponse(content={"error": "文件处理出错"}, status_code=500)

    save_path_list = []
    for file in files:
        if file.filename == '':
            return JSONResponse(content={"error": "没有选择文件"}, status_code=400)
        if file and allowed_file(file.filename):
            filename = secure_filename(file.filename)
            save_path = os.path.join(SOURCE_FILES_PATH, filename)
            with open(save_path, 'wb') as buffer:
                shutil.copyfileobj(file.file, buffer)
            save_path_list.append(save_path)
        else:
            return JSONResponse(content={"error": "不允许的文件类型"}, status_code=400)
    return JSONResponse(content={"message": "文件上传成功", "paths": save_path_list}, status_code=201)


@router.post('/excel/conformity')
async def run_conformity_api():
    global output_path_value  # 声明全局变量
    try:
        create_dir_if_not_exists(EXCEL_FILES_PATH)

        # 清空EXCEL_FILES_PATH目录
        for filename in os.listdir(EXCEL_FILES_PATH):
            file_path = os.path.join(EXCEL_FILES_PATH, filename)
            try:
                if os.path.isfile(file_path) or os.path.islink(file_path):
                    os.unlink(file_path)
                elif os.path.isdir(file_path):
                    shutil.rmtree(file_path)
            except Exception as e:
                return JSONResponse(content={"error": "文件处理出错"}, status_code=500)

        # 运行方法
        output_path = run_conformity()
        output_path_value = output_path
        return JSONResponse(content={"message": "conformity.py 运行成功", "output_path": str(output_path)}, status_code=200)
    except Exception as e:
        return JSONResponse(content={"error": str(e)}, status_code=500)


@router.get('/excel/file/status')
async def get_file_status():
    try:
        return JSONResponse(content={"output_path": str(output_path_value)}, status_code=200)
    except Exception as e:
        return JSONResponse(content={"error": str(e)}, status_code=500)


@router.get('/excel/download_excel')
async def download_excel():
    try:
        files = os.listdir(EXCEL_FILES_PATH)
        first_file = files[0]
        return FileResponse(os.path.join(EXCEL_FILES_PATH, first_file), filename=first_file,
                            media_type='application/vnd.openxmlformats-officedocument.spreadsheetml.sheet')
    except FileNotFoundError:
        raise HTTPException(status_code=404, detail="文件不存在")
    except Exception as e:
        raise HTTPException(status_code=500, detail="服务器错误")