#!/usr/bin/env python3
'''
Title: pyissuesyncd
(c) 2021 Jake "Poikilos" Gustafson


Purpose:
This python-based daemon synchronizes issues (one-way) from one
repository to another.


License:
See the license file in the included EnlivenMinetest directory or at
[EnlivenMinetest](https://github.com/poikilos/EnlivenMinetest)


Outputs:
data_directory: The data directory for this service daemon is
os.path.join(profile, ".cache", "pyissuesyncd").


required arguments:
--dst-repo (or set the DST_REPO environment variable)
    Issues and dependent data will be overwritten at this API URL.


optional arguments:
Environment variables get be set, but a CLI argument will override the
corresponding variable noted below in all caps.

The two _CACHE directories below are used as the single_cache option
for the Repo (see enissue.py's Repo class for documentation).

--src-cache: Set the directory to store a cached version of the source repo's data.
* defaults to SRC_CACHE or os.path.join(data_directory, "source")

--dst-cache: Set the directory to store a cached version of the destination repo's data.
* defaults to DST_CACHE or os.path.join(data_directory, "destination")


Examples:
DST_REPO=https://example.com/git/repo pyissuesyncd
pyissuesyncd --dst-repo https://example.com/git/repo

'''
import os
import sys
import json
# see <https://stackoverflow.com/questions/5574702/how-to-print-to-stderr-in-python>
def error(*args, **kwargs):
    print(*args, file=sys.stderr, **kwargs)


myFilePath = os.path.realpath(__file__)
me = os.path.basename(__file__)
myDir = os.path.dirname(myFilePath)

try:
    import enissue
except ModuleNotFoundError as ex:
    PATH = os.environ.get("PATH")
    found_d = None
    if PATH is not None:
        more_paths = PATH.split(os.pathsep)
        # ^ pathsep such as ':' (NOT dirsep such as '/'!)
        more_paths
        for this_d in more_paths:
            tryF = os.path.join(this_d, "enissue.py")
            if os.path.isfile(tryF):
                found_d = this_d
                break
    if found_d is not None:
        sys.path.append(found_d)
        print("* detected enissue.py in {}".format(found_d))
        # print("path: {}".format(sys.path))

        try:
            import eni
        except ModuleNotFoundError as ex2:
            error(ex2)
            print("{} must be in the same directory as enissue.py or in"
                  " PATH".format(me))
            sys.exit(1)
    else:
        print("{} must be in the same directory as enissue.py or in"
              " PATH".format(me))
        raise ex

from enissue import Repo

data_directory = os.path.join(Repo.profile, ".cache", "pyissuesyncd")

def get_issue(repo, options, issue_no):
    results, err = repo.load_issues(
        options,
        issue_no=issue_no,
    )
    if results is None:
        if err is not None:
            if repo.ERROR_410 in err:
                # The issue was deleted
                pass
            error(err)
            return None, err
        else:
            msg = ("Unknown error: Results should not be None unless"
                   " there is an error (issue_no={})."
                   "".format(issue_no))
            return None, msg
    elif not isinstance(results, list):
        raise RuntimeError("Results must be a list even if there is"
                           " only one result.")
    elif len(results) > 1:
        raise RuntimeError("Results should have"
                           " only one result.")
    issue = results[0]
    '''
    match = repo.get_match(
        mode,
        issue_no=issue_no,
        match_all_labels_lower=match_all_labels_lower,
    )
    matching_issue = match['issue']
    if matching_issue is not None:
        repo.show_issue(
            matching_issue,
            refresh=False,
            never_expire=options.get('never_expire') is True,
        )
    '''
    return issue, None


def start_issuesyncd(src_options, dst_options):
    # src_never_expire = src_options.get('never_expire') is True
    issue_no = 1
    # while True:
    src_repo = Repo(src_options)
    src_issue, err = get_issue(src_repo, src_options, issue_no)
    print("src_issue:")
    print(json.dumps(src_issue, indent=2))

    enissue.set_verbose(True)
    dst_repo = Repo(dst_options)
    dst_issue, err = get_issue(dst_repo, dst_options, issue_no)
    print("dst_issue:")
    print(json.dumps(dst_issue, indent=2))

    issue_no += 1

def usage():
    print(__doc__)

if __name__ == "__main__":
    src_options = {
        'repo_url': "https://github.com/poikilos/EnlivenMinetest",
        'never_expire': True,
        'quiet': True,
    }
    dst_options = {
        'never_expire': True,
        'quiet': True,
    }
    DST_REPO = os.environ.get("DST_REPO")
    if DST_REPO is not None:
        dst_options['repo_url'] = DST_REPO
        del DST_REPO
    SRC_REPO = os.environ.get("SRC_REPO")
    if DST_REPO is not None:
        src_options['repo_url'] = SRC_REPO
        del SRC_REPO

    SRC_CACHE = os.environ.get("SRC_CACHE")
    if SRC_CACHE is None:
        SRC_CACHE = os.path.join(data_directory, "source")

    DST_CACHE = os.environ.get("DST_CACHE")
    if DST_CACHE is None:
        DST_CACHE = os.path.join(data_directory, "destination")

    prev_arg = None

    manual_args = ['--dst-repo', '--src-repo', '--src-cache', '--dst-cache']

    for arg in sys.argv[1:]:
        if prev_arg == "--dst-repo":
            dst_options['repo_url'] = arg
        elif prev_arg == "--src-repo":
            src_options['repo_url'] = arg
        elif prev_arg == "--src_cache":
            SRC_CACHE = arg
        elif prev_arg == "--dst_cache":
            DST_CACHE = arg
        elif arg in manual_args:
            pass
        else:
            usage()
            error("Error: The argument is not valid: {}".format(arg))
            sys.exit(1)
        prev_arg = arg

    src_options['single_cache'] = SRC_CACHE
    dst_options['single_cache'] = DST_CACHE


    error("SRC_REPO (--src-repo) is {}"
          "".format(src_options.get('repo_url')))
    error("DST_REPO (--dst-repo) is {}"
          "".format(dst_options.get('repo_url')))
    if dst_options.get('repo_url') is None:
        error("Error: You must set DST_REPO in the environment or specify a url after --dst-repo")
        sys.exit(1)

    start_issuesyncd(src_options, dst_options)