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

"""

 (c) 2014-2016 - Copyright Red Hat Inc

 Authors:

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

"""

from __future__ import unicode_literals

import sqlalchemy as sa

import wtforms

try:

    from flask_wtf import FlaskForm

except ImportError:

    from flask_wtf import Form as FlaskForm

from sqlalchemy.orm import relation

from sqlalchemy.orm import backref

import pagure.lib.git

import pagure.lib.tasks_services

from pagure.hooks import BaseHook, BaseRunner

from pagure.lib.model import BASE, Project

class PagureRequestsTable(BASE):

    """ Stores information about the pagure requests hook deployed on a

    project.

    Table -- hook_pagure_requests

    """

    __tablename__ = "hook_pagure_requests"

    id = sa.Column(sa.Integer, primary_key=True)

    project_id = sa.Column(

        sa.Integer,

        sa.ForeignKey("projects.id", onupdate="CASCADE", ondelete="CASCADE"),

        nullable=False,

        unique=True,

        index=True,

    )

    active = sa.Column(sa.Boolean, nullable=False, default=False)

    project = relation(

        "Project",

        remote_side=[Project.id],

        backref=backref(

            "pagure_hook_requests",

            cascade="delete, delete-orphan",

            single_parent=True,

            uselist=False,

        ),

    )

class PagureRequestRunner(BaseRunner):

    """ Runner for the hook updating the db about requests on push to the

    git repo containing the meta-data about pull-requests.

    """

    @staticmethod

    def post_receive(session, username, project, repotype, repodir, changes):

        """ Run the default post-receive hook.

        For args, see BaseRunner.runhook.

        """

        if repotype != "requests":

            print(

                "The pagure requests hook only runs on the requests "

                "git repo."

            )

            return

        if username == "pagure":

            # This was an update from inside the UI. Do not trigger further

            # database updates, as this has already been done

            return

        for refname in changes:

            (oldrev, newrev) = changes[refname]

            if set(newrev) == set(["0"]):

                print(

                    "Deleting a reference/branch, so we won't run the "

                    "pagure hook"

                )

                return

            commits = pagure.lib.git.get_revs_between(

                oldrev, newrev, repodir, refname

            )

            pagure.lib.tasks_services.load_json_commits_to_db.delay(

                name=project.name,

                commits=commits,

                abspath=repodir,

                data_type="pull-request",

                agent=username,

                namespace=project.namespace,

                username=project.user.user if project.is_fork else None,

            )

class PagureRequestsForm(FlaskForm):

    """ Form to configure the pagure hook. """

    active = wtforms.BooleanField("Active", [wtforms.validators.Optional()])

class PagureRequestHook(BaseHook):

    """ Pagure request hook. """

    name = "Pagure requests"

    description = (

        "Pagure specific hook to update pull-requests stored "

        "in the database based on the information pushed in the requests "

        "git repository."

    )

    form = PagureRequestsForm

    db_object = PagureRequestsTable

    backref = "pagure_hook_requests"

    form_fields = ["active"]

    runner = PagureRequestRunner