from grow.common import config
from grow.common import utils
from xtermcolor import colorize
import json
import logging
import os
import semantic_version
import subprocess
import sys
import urllib

RELEASES_API = 'https://api.github.com/repos/grow/grow/releases'
INSTALLER_COMMAND = ('/usr/bin/python -c "$(curl -fsSL '
                     'https://raw.github.com/grow/grow/master/install.py)"')


class Error(Exception):
    pass


class LatestVersionCheckError(Error):
    pass


def get_this_version():
    return config.VERSION


def get_latest_version():
    try:
        releases = json.loads(urllib.urlopen(RELEASES_API).read())
        return releases[0]['tag_name']
    except Exception as e:
        text = 'Cannot check for updates to the SDK while offline.'
        logging.error(colorize(text, ansi=198))
        raise LatestVersionCheckError(str(e))


def check_sdk_version(pod):
    sdk_version = get_this_version()
    requires_version = pod.grow_version
    if requires_version is None:
        return
    if (semantic_version.Version(sdk_version)
        not in semantic_version.Spec(requires_version)):
        text = 'WARNING! Pod requires Grow SDK version: {}'.format(requires_version)
        raise LatestVersionCheckError(colorize(text, ansi=197))


def check_for_sdk_updates(auto_update_prompt=False):
    try:
        theirs = get_latest_version()
        yours = config.VERSION
    except LatestVersionCheckError:
        return
    if theirs <= yours:
        return
    url = 'https://github.com/grow/grow/releases/tag/{}'.format(theirs)
    logging.info('')
    logging.info('  Please update to the newest version of the Grow SDK.')
    logging.info('  See release notes: {}'.format(url))
    logging.info('  Your version: {}, latest version: {}'.format(
        colorize(yours, ansi=226), colorize(theirs, ansi=82)))
    if utils.is_packaged_app() and auto_update_prompt:
        # If the installation was successful, restart the process.
        try:
            if (raw_input('Auto update now? [y/N]: ').lower() == 'y'
                and subprocess.call(INSTALLER_COMMAND, shell=True) == 0):
                logging.info('Restarting...')
                os.execl(sys.argv[0], *sys.argv)
        except Exception as e:
            text = (
                'In-place update failed. Update manually or use:\n'
                '  curl https://install.growsdk.org | bash')
            logging.error(text)
            sys.exit(-1)
    else:
        logging.info('  Update using: ' + colorize('pip install --upgrade grow', ansi=200))
    print ''