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

"""

 (c) 2014 - Copyright Red Hat Inc

 Authors:

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

"""

import flask

import os

from math import ceil

import pygit2

from sqlalchemy.exc import SQLAlchemyError

from pygments import highlight

from pygments.lexers import guess_lexer

from pygments.lexers.text import DiffLexer

from pygments.formatters import HtmlFormatter

import progit.doc_utils

import progit.lib

import progit.forms

from progit import APP, SESSION, LOG, __get_file_in_tree

### Application

@APP.route('/do_fork/<repo>')</repo>

@APP.route('/do_fork/<username>/<repo>')</repo></username>

def fork_project(repo, username=None):

    """ Fork the project specified into the user's namespace

    """

    repo = progit.lib.get_project(SESSION, repo, user=username)

    if repo is None:

        flask.abort(404)

    try:

        message = progit.lib.fork_project(

            session=SESSION,

            repo=repo,

            repo_folder=APP.config['GIT_FOLDER'],

            fork_folder=APP.config['FORK_FOLDER'],

            user=flask.g.fas_user.username)

        SESSION.commit()

        flask.flash(message)

        return flask.redirect(

            flask.url_for('view_fork_repo',

                username=flask.g.fas_user.username, repo=repo.name)

        )

    except progit.exceptions.ProgitException, err:

        flask.flash(str(err), 'error')

    except SQLAlchemyError, err:  # pragma: no cover

        SESSION.rollback()

        flask.flash(str(err), 'error')

    return flask.redirect(flask.url_for('view_repo',repo=repo.name))

@APP.route('/fork/<username>/<repo>/request-pull/new',</repo></username>

           methods=('GET', 'POST'))

@APP.route('/fork/<username>/<repo>/request-pull/new/<commitid>',</commitid></repo></username>

           methods=('GET', 'POST'))

def new_request_pull(username, repo, commitid=None):

    """ Request pulling the changes from the fork into the project.

    """

    repo = progit.lib.get_project(SESSION, repo, user=username)

    if not repo:

        flask.abort(404)

    repopath = os.path.join(APP.config['FORK_FOLDER'], repo.path)

    repo_obj = pygit2.Repository(repopath)

    parentname = os.path.join(APP.config['GIT_FOLDER'], repo.parent.path)

    orig_repo = pygit2.Repository(parentname)

    if commitid is None:

        commitid = repo_obj.head.target

    diff_commits = []

    diffs = []

    if not repo_obj.is_empty and not orig_repo.is_empty:

        orig_commit = orig_repo[orig_repo.head.target]

        repo_commit = repo_obj[commitid]

        for commit in repo_obj.walk(commitid, pygit2.GIT_SORT_TIME):

            if commit.oid.hex == orig_commit.oid.hex:

                break

            diff_commits.append(commit)

            diffs.append(

                repo_obj.diff(

                    repo_obj.revparse_single(commit.parents[0].oid.hex),

                    repo_obj.revparse_single(commit.oid.hex)

                )

            )

    elif orig_repo.is_empty:

        orig_commit = None

        repo_commit = repo_obj[repo_obj.head.target]

        diff = repo_commit.tree.diff_to_tree(swap=True)

    else:

        flask.flash(

            'Fork is empty, there are no commits to request pulling',

            'error')

        return flask.redirect(flask.url_for(

            'view_fork_repo', username=username, repo=repo.name))

    html_diffs = []

    for diff in diffs:

        html_diffs.append(

            highlight(

                diff.patch,

                DiffLexer(),

                HtmlFormatter(

                    noclasses=True,

                    style="tango",)

            )

        )

    form = progit.forms.RequestPullForm()

    if form.validate_on_submit():

        try:

            if orig_commit:

                orig_commit = orig_commit.oid.hex

            message = progit.lib.new_pull_request(

                SESSION,

                repo=repo.parent,

                repo_from=repo,

                title=form.title.data,

                start_id=orig_commit,

                stop_id=repo_commit.oid.hex,

                user=flask.g.fas_user.username,

            )

            SESSION.commit()

            flask.flash(message)

            return flask.redirect(flask.url_for(

                'view_fork_issues', username=username, repo=repo.name))

        except progit.exceptions.ProgitException, err:

            flask.flash(str(err), 'error')

        except SQLAlchemyError, err:  # pragma: no cover

            SESSION.rollback()

            flask.flash(str(err), 'error')

    return flask.render_template(

        'pull_request.html',

        repo=repo,

        username=username,

        commitid=commitid,

        repo_obj=repo_obj,

        orig_repo=orig_repo,

        diff_commits=diff_commits,

        diffs=diffs,

        html_diffs=html_diffs,

        form=form,

    )