#!/usr/bin/env python
#coding=utf-8
#
# ./download-deps.py
#
# Download Cocos2D-X resources from github (https://github.com/cocos2d/cocos2d-x-3rd-party-libs-bin) and extract from ZIP
#
# Helps prevent repo bloat due to large binary files since they can
# be hosted separately.
#

"""****************************************************************************
Copyright (c) 2014 cocos2d-x.org
Copyright (c) 2014 Chukong Technologies Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************"""

import os.path,zipfile
import shutil
import sys
import traceback
import distutils
import fileinput
import json

from optparse import OptionParser
from time import time
from sys import stdout
from distutils.errors import DistutilsError
from distutils.dir_util import copy_tree, remove_tree

_workpath=''
_current_3rd_libs_version = ''
_repo_name = ''
_filename = ''
_downloaded_file_url = ''
_extracted_folder_name = ''
_zip_file_size = 0

def get_input_value(prompt):
    ret = raw_input(prompt)
    ret.rstrip(" \t")
    return ret

def download_file(url, filename):
    print("==> Ready to download '%s' from '%s'" % (filename, url))
    import urllib2
    try:
        u = urllib2.urlopen(url)
    except urllib2.HTTPError as e:
        if e.code == 404:
            print("==> Error: Could not find the file from url: '%s'" % (url))
        print("==> Http request failed, error code: " + str(e.code) + ", reason: " + e.read())
        sys.exit(1)

    f = open(filename, 'wb')
    meta = u.info()
    content_len = meta.getheaders("Content-Length")
    file_size = 0
    if content_len and len(content_len) > 0:
        file_size = int(content_len[0])
    else:
        # github server may not reponse a header information which contains `Content-Length`,
        # therefore, the size needs to be written hardcode here. While server doesn't return
        # `Content-Length`, use it instead
        print("==> WARNING: Couldn't grab the file size from remote, use 'zip_file_size' section in 'external/config.json'")
        file_size = _zip_file_size

    print("==> Start to download, please wait ...")

    file_size_dl = 0
    block_sz = 8192
    block_size_per_second = 0
    old_time=time()

    while True:
        buffer = u.read(block_sz)
        if not buffer:
            break

        file_size_dl += len(buffer)
        block_size_per_second += len(buffer)
        f.write(buffer)
        new_time = time()
        if (new_time - old_time) > 1:
            speed = block_size_per_second / (new_time - old_time) / 1000.0
            status = ""
            if file_size != 0:
                percent = file_size_dl * 100. / file_size
                status = r"Downloaded: %6dK / Total: %dK, Percent: %3.2f%%, Speed: %6.2f KB/S " % (file_size_dl / 1000, file_size / 1000, percent, speed)
            else:
                status = r"Downloaded: %6dK, Speed: %6.2f KB/S " % (file_size_dl / 1000, speed)

            status = status + chr(8)*(len(status)+1)
            print(status),
            sys.stdout.flush()
            block_size_per_second = 0
            old_time = new_time

    print("==> Downloading finished!")
    f.close()

def default_filter(src,dst):
    """The default progress/filter callback; returns True for all files"""
    return dst

def ensure_directory(target):
    if not os.path.exists(target):
        os.mkdir(target)


class UnrecognizedFormat:
    def __init__(self, prompt):
        self._prompt = prompt
    def __str__(self):
        return self._prompt

def unpack_zipfile(filename, extract_dir, progress_filter=default_filter):
    """Unpack zip `filename` to `extract_dir`

    Raises ``UnrecognizedFormat`` if `filename` is not a zipfile (as determined
    by ``zipfile.is_zipfile()``).  See ``unpack_archive()`` for an explanation
    of the `progress_filter` argument.
    """

    if not zipfile.is_zipfile(filename):
        raise UnrecognizedFormat("%s is not a zip file" % (filename))

    print("==> Extracting files, please wait ...")
    z = zipfile.ZipFile(filename)
    try:
        for info in z.infolist():
            name = info.filename

            # don't extract absolute paths or ones with .. in them
            if name.startswith('/') or '..' in name:
                continue

            target = os.path.join(extract_dir, *name.split('/'))
            target = progress_filter(name, target)
            if not target:
                continue
            if name.endswith('/'):
                # directory
                ensure_directory(target)
            else:
                # file
                data = z.read(info.filename)
                f = open(target,'wb')
                try:
                    f.write(data)
                finally:
                    f.close()
                    del data
            unix_attributes = info.external_attr >> 16
            if unix_attributes:
                os.chmod(target, unix_attributes)
    finally:
        z.close()
        print("==> Extraction done!")


def ask_to_delete_downloaded_zip_file(filename):
    ret = get_input_value("==> Whether to delete the downloaded zip file? It may be reused when you execute this script next time! (yes/no): ")
    ret = ret.strip()
    if ret != 'yes' and ret != 'no':
        print("==> Invalid answer, please answer 'yes' or 'no'!")
        return ask_to_delete_downloaded_zip_file(filename)
    else:
        return True if ret == 'yes' else False

def download_and_unzip_file(url, filename):
    if not os.path.isfile(filename):
        download_file(url, filename)
    try:
        unpack_zipfile(filename, _workpath)
    except UnrecognizedFormat as e:
        print("==> Unrecognized zip format from your local '%s' file!" % (filename))
        if os.path.isfile(filename):
            os.remove(filename)
        print("==> Download it from internet again, please wait...")
        download_and_unzip_file(url, filename)

def _check_python_version():
    major_ver = sys.version_info[0]
    if major_ver > 2:
        print ("The python version is %d.%d. But python 2.x is required. (Version 2.7 is well tested)\n"
               "Download it here: https://www.python.org/" % (major_ver, sys.version_info[1]))
        return False

    return True

def need_to_update_3rd_libs():
    version_file_path = os.path.join(_workpath, "external", "version.json")
    if not os.path.isfile(version_file_path):
        return True

    with open(version_file_path) as data_file:
        data = json.load(data_file)

    if data['prebuilt_libs_version'] == _current_3rd_libs_version:
        return False
    return True

def grab_config():
    config_file_path = os.path.join(_workpath, "external", "config.json")
    if not os.path.isfile(config_file_path):
        raise Exception("Could not find 'external/config.json'")

    with open(config_file_path) as data_file:
        data = json.load(data_file)

    global _current_3rd_libs_version
    global _repo_name
    global _filename
    global _downloaded_file_url
    global _extracted_folder_name
    global _zip_file_size

    _current_3rd_libs_version = data["current_libs_version"]
    _repo_name = data["repo_name"]
    _filename = _current_3rd_libs_version + '.zip'
    _downloaded_file_url = data["repo_parent"] + _repo_name + '/archive/' + _filename
    _zip_file_size = int(data["zip_file_size"])
    # 'v' letter was swallowed by github, so we need to substring it from the 2nd letter
    _extracted_folder_name = _repo_name + '-' + _current_3rd_libs_version[1:]

def main():
    _workpath = os.path.dirname(os.path.realpath(__file__))

    if not _check_python_version():
        exit()

    parser = OptionParser()
    parser.add_option('-r', '--remove-download',
                      action="store", type="string", dest='to_remove_downloaded_zip_file', default=None,
                      help="Whether to remove downloaded zip file, 'yes' or 'no'")

    parser.add_option("-f", "--force-update",
                      action="store_true", dest="force_update", default=False,
                      help="Whether to force update the third party libraries")

    (opts, args) = parser.parse_args()

    grab_config()

    if not opts.force_update and not need_to_update_3rd_libs():
        print("==> Not need to update the third party libraries!")
        exit()

    if os.path.exists(_extracted_folder_name):
        shutil.rmtree(_extracted_folder_name)

    download_and_unzip_file(_downloaded_file_url, _filename)

    print("==> Copying files...")
    folder_for_extracting = os.path.join(_workpath, 'external')
    if not os.path.exists(folder_for_extracting):
        os.mkdir(folder_for_extracting)
    distutils.dir_util.copy_tree(_extracted_folder_name, folder_for_extracting)
    print("==> Cleaning...")
    if os.path.exists(_extracted_folder_name):
        shutil.rmtree(_extracted_folder_name)
    if os.path.isfile(_filename):
        if opts.to_remove_downloaded_zip_file != None:
            if opts.to_remove_downloaded_zip_file == 'yes':
                os.remove(_filename)
        elif ask_to_delete_downloaded_zip_file(_filename):
            os.remove(_filename)

    print("==> DONE! Prebuilt libraries were installed successfully! Cheers!")

# -------------- main --------------
if __name__ == '__main__':
    try:
        main()
    except Exception as e:
        traceback.print_exc()
        sys.exit(1)