#-*- 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

from progit import APP, SESSION, LOG

### Application

@APP.route('/')

def index():

    """ Front page of the application.

    """

    page = flask.request.args.get('page', 1)

    try:

        page = int(page)

    except ValueError:

        page = 1

    limit = APP.config['ITEM_PER_PAGE']

    start = limit * (page - 1)

    end = limit * page

    repos = sorted(os.listdir(APP.config['GIT_FOLDER']))

    repos_length = len(repos)

    total_page = int(ceil(repos_length / float(limit)))

    repos = repos[start:end]

    repos_obj = [

        pygit2.Repository(os.path.join(APP.config['GIT_FOLDER'], repo))

        for repo in repos]

    return flask.render_template(

        'index.html',

        repos=repos,

        repos_obj=repos_obj,

        total_page=total_page,

        page=page,

    )

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

def view_repo(repo):

    """ Front page of a specific repo.

    """

    if repo not in os.listdir(APP.config['GIT_FOLDER']):

        flask.abort(404)

    repo_obj = pygit2.Repository(

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

    cnt = 0

    last_commits = []

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

        last_commits.append(commit)

        cnt += 1

        if cnt == 10:

            break

    return flask.render_template(

        'repo_info.html',

        repo=repo,

        branches=sorted(repo_obj.listall_branches()),

        branchname='master',

        last_commits=last_commits,

        tree=sorted(last_commits[0].tree, key=lambda x: x.filemode),

    )

@APP.route('/<repo>/branch/<branchname>')</branchname></repo>

def view_repo_branch(repo, branchname):

    """ Displays the information about a specific branch.

    """

    if repo not in os.listdir(APP.config['GIT_FOLDER']):

        flask.abort(404)

    repo_obj = pygit2.Repository(

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

    if not branchname in repo_obj.listall_branches():

        flask.abort(404)

    branch = repo_obj.lookup_branch(branchname)

    cnt = 0

    last_commits = []

    for commit in repo_obj.walk(branch.get_object().hex, pygit2.GIT_SORT_TIME):

        last_commits.append(commit)

        cnt += 1

        if cnt == 10:

            break

    return flask.render_template(

        'repo_info.html',

        repo=repo,

        branches=sorted(repo_obj.listall_branches()),

        branchname=branchname,

        last_commits=last_commits,

        tree=sorted(last_commits[0].tree, key=lambda x: x.filemode),

    )

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

@APP.route('/<repo>/log/<branchname>')</branchname></repo>

def view_log(repo, branchname=None):

    """ Displays the logs of the specified repo.

    """

    if repo not in os.listdir(APP.config['GIT_FOLDER']):

        flask.abort(404)

    repo_obj = pygit2.Repository(

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

    if branchname and not branchname in repo_obj.listall_branches():

        flask.abort(404)

    if branchname:

        branch = repo_obj.lookup_branch(branchname)

    else:

        branch = repo_obj.lookup_branch('master')

    try:

        page = int(flask.request.args.get('page', 1))

    except ValueError:

        page = 1

    limit = APP.config['ITEM_PER_PAGE']

    start = limit * (page - 1)

    end = limit * page

    n_commits = 0

    last_commits = []

    for commit in repo_obj.walk(

            branch.get_object().hex, pygit2.GIT_SORT_TIME):

        if n_commits >= start and n_commits <= end:

            last_commits.append(commit)

        n_commits += 1

    total_page = int(ceil(n_commits / float(limit)))

    return flask.render_template(

        'repo_info.html',

        origin='view_log',

        repo=repo,

        branches=sorted(repo_obj.listall_branches()),

        branchname=branchname,

        last_commits=last_commits,

        page=page,

        total_page=total_page,

    )

@APP.route('/<repo>/blob/<identifier>/<path:filename>')</path:filename></identifier></repo>

@APP.route('/<repo>/blob/<identifier>/<path:filename>')</path:filename></identifier></repo>

def view_file(repo, identifier, filename):

    """ Displays the content of a file or a tree for the specified repo.

    """

    if repo not in os.listdir(APP.config['GIT_FOLDER']):

        flask.abort(404, 'Git not found')

    repo_obj = pygit2.Repository(

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

    if identifier in repo_obj.listall_branches():

        branchname = identifier

        branch = repo_obj.lookup_branch(identifier)

        commit = branch.get_object()

    else:

        try:

            commit = repo_obj.get(identifier)

            branchname = identifier

        except ValueError:

            # If it's not a commit id then it's part of the filename

            commit = repo_obj[repo_obj.head.target]

            branchname = 'master'

    def __get_file_in_tree(tree, filepath):

        ''' Retrieve the entry corresponding to the provided filename in a

        given tree.

        '''

        filename = filepath[0]

        if isinstance(tree, pygit2.Blob):

            return

        for el in tree:

            if el.name == filename:

                if len(filepath) == 1:

                    return repo_obj[el.oid]

                else:

                    return __get_file_in_tree(repo_obj[el.oid], filepath[1:])

    content = __get_file_in_tree(commit.tree, filename.split('/'))

    if not content:

        flask.abort(404, 'File not found')

    content = repo_obj[content.oid]

    if isinstance(content, pygit2.Blob):

        content = highlight(

            content.data,

            guess_lexer(content.data),

            HtmlFormatter(

                noclasses=True,

                style="tango",)

        )

        output_type = 'file'

    else:

        content = sorted(content, key=lambda x: x.filemode)

        output_type = 'tree'

    return flask.render_template(

        'file.html',

        repo=repo,

        branchname=branchname,

        filename=filename,

        content=content,

        output_type=output_type,

    )

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

def view_commit(repo, commitid):

    """ Render a commit in a repo

    """

    if repo not in os.listdir(APP.config['GIT_FOLDER']):

        flask.abort(404)

    repo_obj = pygit2.Repository(

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

    try:

        commit = repo_obj.get(commitid)

    except ValueError:

        flask.abort(404)

    if commit.parents:

        diff = commit.tree.diff_to_tree()

        parent = repo_obj.revparse_single('%s^' % commitid)

        diff = repo_obj.diff(parent, commit)

    else:

        # First commit in the repo

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

    html_diff = highlight(

        diff.patch,

        DiffLexer(),

        HtmlFormatter(

            noclasses=True,

            style="tango",)

    )

    return flask.render_template(

        'commit.html',

        repo=repo,

        commitid=commitid,

        commit=commit,

        diff=diff,

        html_diff=html_diff,

    )

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

@APP.route('/<repo>/tree/<identifier>')</identifier></repo>

def view_tree(repo, identifier=None):

    """ Render the tree of the repo

    """

    if repo not in os.listdir(APP.config['GIT_FOLDER']):

        flask.abort(404)

    repo_obj = pygit2.Repository(

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

    if identifier in repo_obj.listall_branches():

        branchname = identifier

        branch = repo_obj.lookup_branch(identifier)

        commit = branch.get_object()

    else:

        try:

            commit = repo_obj.get(identifier)

            branchname = identifier

        except (ValueError, TypeError):

            # If it's not a commit id then it's part of the filename

            commit = repo_obj[repo_obj.head.target]

            branchname = 'master'

    content = sorted(commit.tree, key=lambda x: x.filemode)

    output_type = 'tree'

    return flask.render_template(

        'file.html',

        repo=repo,

        branchname=branchname,

        filename='',

        content=content,

        output_type=output_type,

    )