#!/usr/bin/env python
# -*- coding: UTF-8 -*-
# Language Version: 3.4.x
# Last Modified: 2015-06-04 11:45:15


__all__ = []
__author__ = "lfblogs (email:13701242710@163.com)"
__version__ = "1.0.1"


import os
import re
import base64
import random
import urllib
import datetime


from werkzeug.utils import secure_filename


class Uploader:

    stateError = {
        "ERROR_CREATE_DIR" : "存储目录无权限,创建失败",
        "ERROR_DIR_WRITE_NOT_ENABLE" : "存储目录无写入权限",
        "ERROR_DEAD_LINK" : "链接不可用",
        "ERROR_FILE_SAVE" : "文件保存时出错",
        "ERROR_FILE_NOT_FOUND" : "未找到上传文件",
        "ERROR_HTTP_CONTENTTYPE" : "链接类型不正确",
        "ERROR_HTTP_LINK": "链接无效,只允许HTTP链接",
        "ERROR_SIZE_EXCEED" : "文件大小超出限制",
        "ERROR_TEMP_FILE" : "临时文件错误",
        "ERROR_TEMP_FILE_NOT_FOUNT" : "未找到临时文件",
        "ERROR_TYPE_NOT_ALLOWED" : "文件类型不允许",
        "ERROR_UNKNOWN" : "未知错误",
        "ERROR_WRITE_CONTENT": "写入文件内容错误",
        }

    stateMap = [
        "SUCCESS",  
        "文件大小超出 upload_max_filesize 限制",
        "文件大小超出 MAX_FILE_SIZE 限制",
        "文件未被完整上传",
        "没有文件被上传",
        "上传文件为空",
        ]

    def __init__(self,file_obj,settings,static_root,_type=None):
        """
        :param file_obj: Image URL, FileStorage or Base64Encode
        :param settings: Config
        :param static_root: File save content
        :param _type: upload type,base64,remote
        """

        self.file_obj = file_obj
        self.settings = settings
        self.static_root = static_root
        self._type = _type
        if _type == 'remote':
            self.saveRemote()
        elif _type == 'base64':
            self.upBase64()
        else:
            self.upFile()

    def saveRemote(self):
        _file = urllib.urlopen(self.file_obj)
        self.oriName = self.settings['oriName']
        self.FileSize = 0
        self.FileType = self.getFileExt()
        self.FullName = self.getFullName()
        self.FilePath = self.getFilePath()

        #Check whether the file size is beyond the limit.
        if not self.checkSize():
            self.statInfo = self.getStateError("ERROR_SIZE_EXCEED")
            return

        #Check the store path exists, does not exist is created.
        dirname = os.path.dirname(self.FilePath)
        if not os.path.exists(dirname):
            try:
                os.makedirs(dirname)
            except:
                self.stateInfo = self.getStateError("ERROR_CREATE_DIR")
                return
        elif not os.access(dirname,os.W_OK):
            self.statInfo = self.getStateError("ERROR_DIR_WRITE_NOT_ENABLE")
        try:
            with open(self.FilePath,'wb') as fp:
                fp.write(_file.read())
            self.stateInfo = self.stateMap[0]
        except:
            self.stateInfo = self.getStateError("ERROR_FILE_SAVE")
            return
    
    def upBase64(self):
        # Deal with base64 encoded image upload.
        image = base64.b64decode(self.file_obj)
        self.oriName = self.settings['oriName']
        self.FileSize = len(image)
        self.FileType = self.getFileExt()
        self.FullName = self.getFullName()
        self.FilePath = self.getFilePath()

        # Check whether the file size is beyond the limit.
        if not self.checkSize():
            self.stateInfo = self.getStateError('ERROR_SIZE_EXCEED')
            return

        # Check the path exists, does not exist is created.
        dirname = os.path.dirname(self.FilePath)
        if not os.path.exists(dirname):
            try:
                os.makedirs(dirname)
            except:
                self.stateInfo = self.getStateError('ERROR_CREATE_DIR')
                return
        elif not os.access(dirname, os.W_OK):
            self.stateInfo = self.getStateError('ERROR_DIR_WRITE_NOT_ENABLE')
            return

        try:
            with open(self.FilePath, 'wb') as fp:
                fp.write(image)
            self.stateInfo = self.stateMap[0]
        except:
            self.stateInfo = self.getStateError('ERROR_FILE_SAVE')
            return
    

    def upFile(self):
        # Upload a file of the main processing method.
        self.oriName = self.file_obj.filename
    
        # Access to the file size
        self.FileSize = len(self.file_obj.value)
        self.FileType = self.getFileExt()
        self.FullName = self.getFullName()
        self.FilePath = self.getFilePath()

        # Check whether the file size is beyond the limit.
        if not self.checkSize():
            self.stateInfo = self.getStateError('ERROR_SIZE_EXCEED')
            return

        # Check are not allowed to file format.
        if not self.checkType():
            self.stateInfo = self.getStateError('ERROR_TYPE_NOT_ALLOWED')
            return

        # Check the path exists, does not exist is created.
        dirname = os.path.dirname(self.FilePath)
        if not os.path.exists(dirname):
            try:
                os.makedirs(dirname)
            except:
                self.stateInfo = self.getStateError('ERROR_CREATE_DIR')
                return
        elif not os.access(dirname, os.W_OK):
            self.stateInfo = self.getStateError('ERROR_DIR_WRITE_NOT_ENABLE')
            return

        # Save the file.
        try:
            with open(self.FilePath, 'wb') as fp:
                fp.write(self.file_obj.value)
            self.stateInfo = self.stateMap[0]
        except:
            self.stateInfo = self.getStateError('ERROR_FILE_SAVE')
            return
    def getStateError(self,error):
        #Check the upload error.
        return self.stateError.get(error,"ERROR_UNKNOWN")

    def checkSize(self):
        #Detect the file size.
        return self.FileSize <= self.settings["maxSize"]

    def checkType(self):
        #Test the file type.
        return self.FileType.lower() in self.settings["allowFiles"]

    def getFilePath(self):
        #Get full path to the file
        rootPath = self.static_root
        filePath = ''
        for path in self.FullName.split("/"):
            filePath = os.path.join(filePath,path)
        return os.path.join(rootPath,filePath)
    def getFileExt(self):
        #For file name extension
        return ('.%s' % self.oriName.split('.')[-1].lower())

    def getFullName(self):
        #Rename the file
        now = datetime.datetime.now()
        _time = now.strftime("%H%M%S")

        #Replace the date event.
        _format = self.settings['pathFormat']
        _format = _format.replace('{yyyy}', str(now.year))
        _format = _format.replace('{mm}', str(now.month))
        _format = _format.replace('{dd}', str(now.day))
        _format = _format.replace('{hh}', str(now.hour))
        _format = _format.replace('{ii}', str(now.minute))
        _format = _format.replace('{ss}', str(now.second))
        _format = _format.replace('{ss}', str(now.second))
        _format = _format.replace('{time}', _time)

        #Filter the filename illegal characters.
        _format = _format.replace('{filename}',secure_filename(self.oriName))

        #Replace the random string.
        rand_re = r'\{rand\:(\d*)\}'
        _pattern = re.compile(rand_re, flags=re.I)
        _match = _pattern.search(_format)
        if _match is not None:
            n = int(_match.groups()[0])
            _format = _pattern.sub(str(random.randrange(10**(n-1), 10**n)), _format)

        _ext = self.getFileExt()
        return '%s%s' % (_format, _ext)
    def getFileInfo(self):
        # All the information for current file upload success.
        #filename = re.sub(r'^/', '', self.FullName)
        filename=self.FullName
        return {
            'state': self.stateInfo,
            'url': filename,
            'title': self.oriName,
            'original': self.oriName,
            'type': self.FileType,
            'size': self.FileSize,
        }
        
