#!/usr/bin/python3

import json
import os
import re
import sys

import copr.v3

ENV_VARS = {
    '_COPR_CONFIG': '~/.config/copr',  # Copr config file. Get it through https://<copr instance>/api/.
    'COPR_OWNER': '',  # Owner of the Copr project
    'COPR_PROJECT': '',  # The Copr project to search
    'COPR_PACKAGE': '',  # Name of the package to look for. This is optional - if empty, any package in the
                         # project is considered.
    'PKG_RELEASE': '',  # The release part of the pkg NEVRA string, e.g.
                        #  0.201906041623Z.f82f863.add_missing_deps.PR231
    'COPR_REPO': '',  # An alternative to COPR_OWNER & COPR_PROJECT. This env var should hold "owner/project".
    'REGEX': ''   # A more general way to search for release_id matches via regex. Generalization of PKG_RELEASE
}
# override defaults with environment variables
for env, default in ENV_VARS.items():
    ENV_VARS[env] = os.getenv(env, default)


def _fail(error):
    if not error.endswith('\n'):
        error += '\n'
    sys.stderr.write(error)
    # dump ENV dictionary
    sys.stderr.write('Passed (or default) environment variables:\n')
    for var, value in ENV_VARS.items():
        sys.stderr.write('  {}: {}\n'.format(var, value))
    sys.exit(1)


def get_builds(ownername, projectname, configpath, client=None, debug=False):
    client = client or copr.v3.Client(copr.v3.config_from_file(path=configpath))
    builds = client.build_proxy.get_list(status='succeeded',
                                         pagination={'order': 'id', 'order_type': 'DESC'},
                                         ownername=ownername,
                                         projectname=projectname,
                                         packagename=ENV_VARS['COPR_PACKAGE'])
    if debug:
        json.dump(builds, sys.stderr, sort_keys=True, indent=2)
        sys.stderr.write('\n')
    return builds


def get_latest_build(ownername, projectname, configpath, match_criteria, client=None, debug=False):
    client = client or copr.v3.Client(copr.v3.config_from_file(path=configpath))
    builds = get_builds(ownername, projectname, configpath, client, debug)
    for build in builds:
        # Version in COPR contains VERSION-RELEASE string. We need just the release.
        full_name = '{}-{}'.format(build['source_package']['name'], build['source_package']['version'])
        release = build['source_package']['version'].split('-')[-1]
        if re.match(match_criteria, full_name) or release.startswith(match_criteria):
            return build['id']
    return None


if __name__ == "__main__":
    # Vet arguments in ENV first
    ownername = ENV_VARS['COPR_OWNER']
    projectname = ENV_VARS['COPR_PROJECT']
    if ENV_VARS['COPR_REPO']:
        if '/' in ENV_VARS['COPR_REPO']:
            ownername, projectname = ENV_VARS['COPR_REPO'].split('/', 1)
        else:
            projectname = ENV_VARS['COPR_REPO']
    # If after all those actions either owner or project is not defined - give up and fail
    if not ownername or not projectname:
        error = ('Error: Use either COPR_REPO env var in a format "owner/project" or '
                 'COPR_OWNER & COPR_PROJECT env vars to specify the Copr repository to search in.')
        _fail(error)
    # Check that match criteria is defined
    match_criteria = ENV_VARS['REGEX'] or ENV_VARS['PKG_RELEASE']
    # If both REGEX and PKG_RELEASE have been set - inform that regex takes over
    if ENV_VARS['REGEX'] and ENV_VARS['PKG_RELEASE']:
        sys.stderr.write('Warning: Both REGEX and PKG_RELEASE were set - REGEX has higher priority\n')
    if not match_criteria:
        error = 'Error: Use either PKG_RELEASE or REGEX env var to specify the match condition for NEVRA string.'
        _fail(error)
    build_id = get_latest_build(ownername=ownername,
                                projectname=projectname,
                                configpath=os.path.expandvars(ENV_VARS['_COPR_CONFIG']),
                                match_criteria=match_criteria,
                                debug='--debug' in sys.argv[1:])
    if not build_id:
        error = 'Error: The build with the required release has not been found: {}'.format(match_criteria)
        _fail(error)
    # Output the id of the latest matching build
    print(build_id)