# -*- coding: utf-8 -*-
"""
    wakatime.projects.git
    ~~~~~~~~~~~~~~~~~~~~~

    Information about the git project for a given file.

    :copyright: (c) 2013 Alan Hamlett.
    :license: BSD, see LICENSE for more details.
"""

import logging
import os
import sys

from .base import BaseProject
from ..compat import u, open


log = logging.getLogger('WakaTime')


class Git(BaseProject):

    def process(self):
        self.configFile = self._find_git_config_file(self.path)
        return self.configFile is not None

    def name(self):
        base = self._project_base()
        if base:
            return u(os.path.basename(base))
        return None  # pragma: nocover

    def branch(self):
        base = self._project_base()
        if base:
            head = os.path.join(self._project_base(), '.git', 'HEAD')
            try:
                with open(head, 'r', encoding='utf-8') as fh:
                    return self._get_branch_from_head_file(fh.readline())
            except UnicodeDecodeError:  # pragma: nocover
                try:
                    with open(head, 'r', encoding=sys.getfilesystemencoding()) as fh:
                        return self._get_branch_from_head_file(fh.readline())
                except:
                    log.traceback(logging.WARNING)
            except IOError:  # pragma: nocover
                log.traceback(logging.WARNING)
        return u('master')

    def _project_base(self):
        if self.configFile:
            return os.path.dirname(os.path.dirname(self.configFile))
        return None  # pragma: nocover

    def _find_git_config_file(self, path):
        path = os.path.realpath(path)
        if os.path.isfile(path):
            path = os.path.split(path)[0]
        if os.path.isfile(os.path.join(path, '.git', 'config')):
            return os.path.join(path, '.git', 'config')
        split_path = os.path.split(path)
        if split_path[1] == '':
            return None
        return self._find_git_config_file(split_path[0])

    def _get_branch_from_head_file(self, line):
        if u(line.strip()).startswith('ref: '):
            return u(line.strip().rsplit('/', 1)[-1])
        return None