#-*- 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.exceptions

import progit.lib

import progit.forms

from progit import APP, SESSION, LOG, __get_file_in_tree, cla_required

### Application

def do_view_repo(repo, username=None):

    """ Front page of a specific repo.

    """

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

    if repo is None:

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

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

    if repo.is_fork:

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

    repo_obj = pygit2.Repository(reponame)

    cnt = 0

    last_commits = []

    tree = []

    if not repo_obj.is_empty:

        for commit in repo_obj.walk(

                repo_obj.head.target, pygit2.GIT_SORT_TIME):

            last_commits.append(commit)

            cnt += 1

            if cnt == 10:

                break

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

    readme = None

    for i in tree:

        name, ext = os.path.splitext(i.name)

        if name == 'README':

            content = repo_obj[i.oid].data

            readme = progit.doc_utils.convert_readme(content, ext)

    diff_commits = []

    if repo.is_fork:

        parentname = os.path.join(

            APP.config['GIT_FOLDER'], repo.parent.path)

        orig_repo = pygit2.Repository(parentname)

        if not repo_obj.is_empty and not orig_repo.is_empty:

            orig_commit = orig_repo[orig_repo.head.target]

            repo_commit = repo_obj[repo_obj.head.target]

            diff = repo_obj.diff(

                repo_obj.revparse_single(orig_commit.oid.hex),

                repo_obj.revparse_single(repo_commit.oid.hex))

            for commit in repo_obj.walk(

                    repo_obj.head.target, pygit2.GIT_SORT_TIME):

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

                    break

                diff_commits.append(commit.oid.hex)

    return flask.render_template(

        'repo_info.html',

        select='overview',

        repo=repo,

        repo_obj=repo_obj,

        username=username,

        readme=readme,

        branches=sorted(repo_obj.listall_branches()),

        branchname='master',

        last_commits=last_commits,

        tree=tree,

        diff_commits=diff_commits,

    )

def do_view_repo_branch(repo, branchname, username=None):

    """ Displays the information about a specific branch.

    """

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

    if not repo:

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

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

    if repo.is_fork:

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

    repo_obj = pygit2.Repository(reponame)

    if not branchname in repo_obj.listall_branches():

        flask.abort(404, 'Branch no found')

    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

    diff_commits = []

    if repo.is_fork:

        parentname = os.path.join(

            APP.config['GIT_FOLDER'], repo.parent.path)

        orig_repo = pygit2.Repository(parentname)

        if not repo_obj.is_empty and not orig_repo.is_empty:

            orig_commit = orig_repo[orig_repo.head.target]

            repo_commit = repo_obj[branch.get_object().hex]

            diff = repo_obj.diff(

                repo_obj.revparse_single(orig_commit.oid.hex),

                repo_obj.revparse_single(repo_commit.oid.hex))

            for commit in repo_obj.walk(

                    repo_obj.head.target, pygit2.GIT_SORT_TIME):

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

                    break

                diff_commits.append(commit.oid.hex)

    return flask.render_template(

        'repo_info.html',

        select='overview',

        repo=repo,

        username=username,

        branches=sorted(repo_obj.listall_branches()),

        branchname=branchname,

        last_commits=last_commits,

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

        diff_commits=diff_commits,

    )

def do_view_log(repo, branchname=None, username=None):

    """ Displays the logs of the specified repo.

    """

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

    if not repo:

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

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

    if repo.is_fork:

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

    repo_obj = pygit2.Repository(reponame)

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

        flask.abort(404, 'Branch no found')

    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 = []

    if branch:

        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)))

    diff_commits = []

    if repo.is_fork:

        parentname = os.path.join(

            APP.config['GIT_FOLDER'], repo.parent.path)

        orig_repo = pygit2.Repository(parentname)

        if not repo_obj.is_empty and not orig_repo.is_empty:

            orig_commit = orig_repo[orig_repo.head.target]

            repo_commit = repo_obj[branch.get_object().hex]

            diff = repo_obj.diff(

                repo_obj.revparse_single(orig_commit.oid.hex),

                repo_obj.revparse_single(repo_commit.oid.hex))

            for commit in repo_obj.walk(

                    repo_obj.head.target, pygit2.GIT_SORT_TIME):

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

                    break

                diff_commits.append(commit.oid.hex)

    origin = 'view_log'

    return flask.render_template(

        'repo_info.html',

        select='logs',

        origin=origin,

        repo_obj=repo_obj,

        repo=repo,

        username=username,

        branches=sorted(repo_obj.listall_branches()),

        branchname=branchname,

        last_commits=last_commits,

        diff_commits=diff_commits,

        page=page,

        total_page=total_page,

    )

def do_view_file(repo, identifier, filename, username=None):

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

    """

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

    if not repo:

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

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

    if repo.is_fork:

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

    repo_obj = pygit2.Repository(reponame)

    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'

    content = __get_file_in_tree(repo_obj, 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',

        select='tree',

        repo=repo,

        username=username,

        branchname=branchname,

        filename=filename,

        content=content,

        output_type=output_type,

    )

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

    """ Render a commit in a repo

    """

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

    if not repo:

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

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

    if repo.is_fork:

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

    repo_obj = pygit2.Repository(reponame)

    try:

        commit = repo_obj.get(commitid)

    except ValueError:

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

    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',

        select='logs',

        repo=repo,

        username=username,

        commitid=commitid,

        commit=commit,

        diff=diff,

        html_diff=html_diff,

    )

def do_view_tree(repo, identifier=None, username=None):

    """ Render the tree of the repo

    """

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

    if repo is None:

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

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

    if repo.is_fork:

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

    repo_obj = pygit2.Repository(reponame)

    branchname = None

    content = None

    output_type = None

    if not repo_obj.is_empty:

        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',

        select='tree',

        repo_obj=repo_obj,

        repo=repo,

        username=username,

        branchname=branchname,

        filename='',

        content=content,

        output_type=output_type,

    )

def do_view_forks(repo, username=None):

    """ Return the list of forks of a project.

    """

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

    if not repo:

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

    return flask.render_template(

        'forks.html',

        select='forks',

        username=username,

        repo=repo,

    )

## URLs

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

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

def view_repo(repo, username=None):

    """ Front page of a specific repo.

    """

    return do_view_repo(repo=repo, username=username)

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

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

def view_repo_branch(repo, branchname, username=None):

    return do_view_repo_branch(repo, branchname, username=username)

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

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

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

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

def view_log(repo, branchname=None, username=None):

    """ Displays the logs of the specified repo.

    """

    return do_view_log(repo, branchname, username=username)

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

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

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

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

def view_file(repo, identifier, filename, username=None):

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

    """

    return do_view_file(repo, identifier, filename, username=username)

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

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

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

    """ Render a commit in a repo

    """

    return do_view_commit(repo, commitid, username=username)

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

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

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

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

def view_tree(repo, identifier=None, username=None):

    """ Render the tree of the repo

    """

    return do_view_tree(repo, identifier=identifier, username=username)

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

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

def view_forks(repo, username=None):

    """ Presents all the forks of the project.

    """

    return do_view_forks(repo, username=username)