#!/usr/bin/env python3
# version: 0.1
# File: /srv/toot/has_update

# Copyright (C) 2023 Cyrille Louarn <echolib+tools@a-lec.org>

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>..

#----------------------------------------------------------------------
# XMPP: echolib (echolib@a-lec.org)
#
# Description:
# Search for release update using git
# ! Assume Project is insalled from git
#
# You may use with script (if you do not give argument to has_update)
# No output = no update
# Output update = v[latest] > v[current]
#
# Convenience -v argument (do not use with script): show both versions
#
# RC errors :
# 1 = Online Capture problem
# 2 = Installed Capture problem
#----------------------------------------------------------------------

import requests, subprocess, sys


# Set Project
#------------
owner = "mastodon" # Also used for sudo -u {owner}
name  = "mastodon"
repo  = f"https://api.github.com/repos/{owner}/{name}/releases/latest"


# VLH (Very Little Help)
helps = """Usage: has_update [argument]
   -h  : This help !
   -v  : Show both versions (online, and installed)
"""

#=====================================================#
# Check available version using Git API with requests #
#-----------------------------------------------------#
def get_available_release():
   response = requests.get(repo)
   if response.status_code == 200:
      latest_release = response.json()
      return latest_release['tag_name']
   else:
      print(f"Failed to get online lates release: {response.status_code}")
      sys.exit(1)


#===========================================#
# Check installed version using git command #
# Assume Project is insalled from git       #
#-------------------------------------------#
def get_installed_release():
   try:
      result = subprocess.run(
       ['sudo', '-u', owner, 'git', 'describe', '--tags', '--exact-match'],
       stdout=subprocess.PIPE, # Get output
       stderr=subprocess.PIPE, # Get error (if any)
       text=True,              # Set stdout + stderr
       check=True              # exception if failure
      )
    
      # Output captured successfully
      return result.stdout.strip()
   
   except subprocess.CalledProcessError as e:
      # Handle the case where the command fails
      print("Failed to get installed release:", e.stderr.strip())
      sys.exit(2)


#======#
# Main #
#------#

# With -h argument, show both versions
if '-h' in sys.argv:
   print(helps)
   sys.exit(0)

# Get versions (online and local)
available_version = get_available_release()
installed_version = get_installed_release() 


# With -v argument, show both versions
if '-v' in sys.argv:
   print(f"{owner}:")
   print(f"- Available: {available_version}\n-Installed: {installed_version}")

# A new version is available
elif available_version != installed_version:
      print(f"{owner}: {installed_version} -> {available_version}")