'''
Gitea Remote Updater

Copyright 2018 Christoph Daniel Miksche
All rights reserved.

License: GNU General Public License
'''
import settings
import requests
import os


# Function to download a file
def download(url, file_name):
    # open in binary mode
    with open(file_name, "wb") as file:
        # get request
        response = requests.get(url)
        # write to file
        print ("writing file", file_name)
        file.write(response.content)

# Function to build the new version from source
def buildFromSource(tag):
    # Change to source dir
    os.chdir(settings.source_dir)
    # Checkout master
    os.system("git checkout master")
    # Update
    os.system("git pull")
    # Checkout relase branch
    os.system("git checkout "+tag)
    # Build from source
    os.system('TAGS="bindata sqlite sqlite_unlock_notify" make generate build')
    # Move binary
    os.system("mv gitea "+settings.gtfile)

def is_tool(name):
    ##Check whether `name` is on PATH and marked as executable. 

    # from whichcraft import which
    from shutil import which

    return which(name) is not None

if not is_tool("xz"):
	print ("missing dependency: xz")
	quit()

# Version from gitea site
current_version = requests.get(settings.gtsite).json()['version']
print ("current_version =", current_version)
# Get version tag from github and remove first char (v)
github_version_tag = requests.get(settings.gtgithubapiurl).json()['tag_name']
print ("github_version_tag =", github_version_tag)
# Get version from version tag
github_version = github_version_tag[1:]
# Check if there is a new version
if github_version > current_version:


    # Stop systemd service
    print ("new version available, stopping service")
    #os.system("systemctl stop gitea.service")

    # Should the new version be build from source?
    if settings.build_from_source:

        buildFromSource(github_version_tag)

    else:
        # Set download url
        ## main file
        gtdownload = 'https://github.com/go-gitea/gitea/releases/download/'+github_version_tag+'/gitea-'+github_version+'-'+settings.gtsystem+'.xz'
        print (gtdownload)
        ## sha256 file
        shadownload = 'https://github.com/go-gitea/gitea/releases/download/'+github_version_tag+'/gitea-'+github_version+'-'+settings.gtsystem+'.xz.sha256'
        print (shadownload)

        # Download file

        ## downloading sha
        print ("downloading sha256 hashsum")
        download(shadownload, settings.tmpdir+'gitea.xz.sha256')
        ## downloading xz
        print ("downloading", github_version_tag+'gitea.xz')
        tmpxz = settings.tmpdir+'gitea-'+github_version+'-'+settings.gtsystem+'.xz'
        download(gtdownload, tmpxz)

        # doing sha256 sum
        os.chdir(settings.tmpdir)
        #sha_value = os.system("sha256sum -c gitea.xz.sha256 > /dev/null")

        if os.system("sha256sum -c gitea.xz.sha256 > /dev/null") == 0:
        	print ("sha ok, extracting file to location")
        	# extracting download file
        	cmd = "xz -d "+tmpxz
        	print (cmd)
        	os.system(cmd)
        	#  moving temp file to gtfile location
        	cmd = 'mv '+settings.tmpdir+'gitea-'+github_version+'-'+settings.gtsystem+' '+settings.gtfile
        	print (cmd)
        	os.system(cmd)
        else:
        	print ("error")
        	quit()

    # Start systemd service
    print ("starting gitea.service")
    os.system("systemctl start gitea.service")

    print ("update successfully")


else:

	#Print current version is uptodate
	print ("current version is uptodate")