# -*- coding: utf-8 -*-

"""

 (c) 2015-2016 - Copyright Red Hat Inc

 Authors:

   Pierre-Yves Chibon <pingou@pingoured.fr></pingou@pingoured.fr>

"""

# pylint: disable=too-many-arguments

from __future__ import unicode_literals

import re

import pagure.lib.query

import pagure.exceptions

FIXES = [

    re.compile(r"(?:.*\s+)?fixe?[sd]?:?\s*?#(\d+)", re.I),

    re.compile(

        r"(?:.*\s+)?fixe?[sd]?:?\s*?https?://.*/([a-zA-z0-9_][a-zA-Z0-9-_]*)"

        r"/(?:issue|pull-request)/(\d+)",

        re.I,

    ),

    re.compile(r"(?:.*\s+)?merge?[sd]?:?\s*?#(\d+)", re.I),

    re.compile(

        r"(?:.*\s+)?merge?[sd]?:?\s*?https?://.*/([a-zA-z0-9_][a-zA-Z0-9-_]*)"

        r"/(?:issue|pull-request)/(\d+)",

        re.I,

    ),

    re.compile(r"(?:.*\s+)?close?[sd]?:?\s*?#(\d+)", re.I),

    re.compile(

        r"(?:.*\s+)?close?[sd]?:?\s*?https?://.*/([a-zA-z0-9_][a-zA-Z0-9-_]*)"

        r"/(?:issue|pull-request)/(\d+)",

        re.I,

    ),

]

RELATES = [

    re.compile(r"(?:.*\s+)?relate[sd]?:?\s*?(?:to)?\s*?#(\d+)", re.I),

    re.compile(r"(?:.*\s+)?relate[sd]?:?\s?#(\d+)", re.I),

    re.compile(

        r"(?:.*\s+)?relate[sd]?:?\s*?(?:to)?\s*?"

        r"https?://.*/([a-zA-z0-9_][a-zA-Z0-9-_]*)/issue/(\d+)",

        re.I,

    ),

]

def get_relation(

    session,

    reponame,

    username,

    namespace,

    text,

    reftype="relates",

    include_prs=False,

):

    """ For a given text, searches using regex if the text contains

    reference to another issue in this project or another one.

    Returns the list of issues referenced (possibly empty).

    If include_prs=True, it may also contain pull requests (may still

    be empty).

    By default it searches for references of type: `relates`, for example:

    ``this commits relates to #2``.

    Another reference type is: `fixes` refering to text including for

    example: ``this commits fixes #3``.

    """

    repo = pagure.lib.query.get_authorized_project(

        session, reponame, user=username, namespace=namespace

    )

    if not repo:

        return []

    regex = RELATES

    if reftype == "fixes":

        regex = FIXES

    relations = []

    for motif in regex:

        relid = None

        project = None

        if motif.match(text):

            if len(motif.match(text).groups()) >= 2:

                relid = motif.match(text).group(2)

                project = motif.match(text).group(1)

            else:

                relid = motif.match(text).group(1)

        if relid:

            relation = pagure.lib.query.search_issues(

                session, repo=repo, issueid=relid

            )

            if relation is None and include_prs:

                relation = pagure.lib.query.search_pull_requests(

                    session, project_id=repo.id, requestid=relid

                )

            if relation is None or relation.project.name not in [

                project,

                repo.name,

            ]:

                continue

            if relation not in relations:

                relations.append(relation)

    return relations