#!/usr/bin/env python
# -*- coding: utf_8 -*-

import os
import re
import sys
import traceback
import tempfile
import shutil
import base64
import logging
from flask import Blueprint, request, redirect, url_for, json

from app.setting import config

if ((3, 0) <= sys.version_info <= (3, 10)):
    from hashlib import md5 as fmd5
elif ((2, 0) <= sys.version_info <= (2, 10)):
    import md5
    fmd5 = md5.new

logger = logging.getLogger("filesApi")

file_api = Blueprint("file_api", __name__, url_prefix="/api/v1/file")

FileStoragePath = os.path.join(config.get("UPLOAD_PATH"), config.get("NETDISC"))

def ajaxCheckAcess(path):
    realpath = os.path.realpath(path)
    if not realpath.startswith(FileStoragePath):
        return False
    return True

def checkPath(path):
    if not path:
        return False, {"code": -1, "data": {}, "message": "[%s] arg missed!" % path}

    fpath = os.path.abspath(os.sep.join([os.path.abspath(FileStoragePath), path]))

    if not ajaxCheckAcess(fpath):
        return False, {"code": -1, "data": {}, "message": "You have no access to [%s]!" % fpath}

    if not os.path.exists(fpath):
        return False, {"code": -1, "data": {}, "message": "[%s] is not existed!" % fpath}

    return True, os.path.abspath(fpath)

def saveToFile(saveFile, content):
    try:
        tfn = tempfile.mktemp()
        tf = open(tfn, 'wb+')
        tf.write(content)
        tf.close()
        os.rename(tfn, saveFile)
        return True
    except Exception as e:
        traceback.format_exc()
        logger.error(str(e))
        return False

def getFileInfo(infofile):
    return {
        "isfile": os.path.isfile(infofile),
        "isdir": os.path.isdir(infofile),
        "size": os.path.getsize(infofile),
        "atime": os.path.getatime(infofile),
        "mtime": os.path.getmtime(infofile),
        "ctime": os.path.getctime(infofile),
        "name": os.path.basename(infofile)
    }

# 参数 {"path":"/xxx/xxx.png"}
# path 需要下载的文件名
@file_api.route("/download", methods=["POST"])
def download():
    try:
        obj = json.loads(request.data)
        isAcessed, path = checkPath(obj["path"])
        if not isAcessed:
            return { "code": -1, "data": {}, "message": "invaild access" }

        if not os.path.isfile(path):
            return {"code": -1, "data": {}, "message": "Path [%s] is not a valid file!" % path}

        with open(path, "rb") as f:
            content = base64.b64encode(f.read())
        md5code = fmd5(content).hexdigest()
        return {
            "code": 0,
            "data": {
                "content": content,
                "md5": md5code,
                "filename": os.path.basename(path)
            },
            "message": "download file [%s] successfully!" % obj['path']
        }
    except Exception as e:
        return {"code": -1, "data": {}, "message": "upload file [%s] failed!\n %s" % (obj['path'], repr(e))}

# 参数 {"filename":"xxx.jpg","path":"/upload/","content":"xxxxxxx","md5":"xxxxxxxxxxxxxx"}
#     filename 保存的文件名，不带路径
#     path 保存的路径
#     content 文件的内容，采用base64编码
#     md5 文件的MD5校验值
@file_api.route("/upload", methods=["POST"])
def upload():
    try:
        obj = json.loads(request.data)

        if not obj['filename'] or not obj['content']:
            return {"code": -1, "data": {}, "message": "filename、path、content and md5 is not completed"}

        saveFile = os.path.normpath(os.sep.join([FileStoragePath, obj['filename']]))

        if not ajaxCheckAcess(saveFile):
            return {"code": -1, "data": {}, "message": "You have no access to [%s]!" % saveFile}

        if os.path.exists(saveFile):
            return {"code": -1, "data": {}, "message": "File [%s] is existed! Please remove firstly" % saveFile}

        fr = base64.b64decode(obj['content'])
        md5code = fmd5(obj['content']).hexdigest()
        if obj['md5'] != md5code:
            return {"code": -1, "data": {}, "message": "File md5 [%s] != [%s]" % (obj['md5'], md5code)}

        if saveToFile(saveFile, fr):
            return {"code": 0, "data": {}, "message": "upload file [%s] successfully!" % obj['filename']}
        else:
            return {"code": -1, "data": {}, "message": "upload file [%s] failed!" % obj['filename']}
    except Exception as e:
        logger.error(str(e))

        binfile = request.files.get("binfile")
        obj = {}
        obj['filename'] = binfile.filename
        obj['content'] = binfile.stream.read()

        saveFile = os.path.normpath(os.sep.join([FileStoragePath, obj['filename']]))
        with open(saveFile, 'wb') as f:
            f.write(obj['content'])
        return {"code": 0, "data": {}, "message": "upload file by ElementUI[%s] successfully!" % obj['filename']}

# 参数 {"path":"/xxx/xxx.png"}
# path 需要删除的文件名或者目录名
@file_api.route("/remove", methods=["POST"])
def delete():
    obj = json.loads(request.data)
    isAcessed, path = checkPath(obj["path"])
    if not isAcessed:
        return { "code": -1, "data": {}, "message": "invaild access" }

    try:
        if os.path.isfile(path):
            os.remove(path)
            return {"code": 0, "data": {}, "message": "delete file [%s] successfully!" % path}
        elif os.path.isdir(path):
            os.rmdir(path)
            return {"code": 0, "data": {}, "message": "delete dir [%s] successfully!" % path}
        else:
            return {"code": 0, "data": {}, "message": "Path [%s] is not a valid file or path!" % path}
    except Exception as e:
        return {"code": -1, "data": {}, "message": repr(e)}

# 参数 {"path":"/"}
# path 路径
@file_api.route("getDirectoryList", methods=["POST"])
def dirlist():
    obj = json.loads(request.data)
    isAcessed, path = checkPath(obj["path"])
    if not isAcessed:
        return { "code": -1, "data": {}, "message": "invaild access" }

    result = []
    for p in os.listdir(path):
        result.append(getFileInfo(os.path.join(FileStoragePath, p)))
    return {"code": 0, "data": result, "message": "Get [%s] successfully!" % path}

# 参数 {"path":"/xe/xxx.png"}
# file 需求获取MD5的文件
@file_api.route("/getFileMD5", methods=["POST"])
def filemd5():
    obj = json.loads(request.data)
    isAcessed, path = checkPath(obj["path"])
    if not isAcessed:
        return { "code": -1, "data": {}, "message": "invaild access" }

    if not os.path.isfile(path):
        return {"code": -1, "data": {}, "message": "Path [%s] is not a valid file!" % path}

    with open(path, "rb") as f:
        filemd5 = fmd5(f.read()).hexdigest()
    return {"code": 0, "data": filemd5, "message": "Get md5 of [%s] successfully!" % path}

# 参数 {"path":"/xe/xxx.png"}
# file 需要获取信息的文件或目录
@file_api.route("/getFileInfo", methods=["POST"])
def fileinfo():
    obj = json.loads(request.data)
    isAcessed, path = checkPath(obj["path"])
    if not isAcessed:
        return { "code": -1, "data": {}, "message": "invaild access" }

    if not os.path.isfile(path):
        return {"code": -1, "data": {}, "message": "Path [%s] is not a valid file!" % path}
    return {"code": 0, "result": getFileInfo(path), "message": "Get md5 of [%s] successfully!" % path}