# -*- coding: utf-8  -*-
#
# Copyright (C) 2011-2014 Ben Kurtovic <ben.kurtovic@gmail.com>
# See the LICENSE file for details.

from __future__ import print_function

import os
import shlex
import subprocess

from colorama import Fore, Style

__all__ = ["update_bookmarks", "update_directories"]

BOLD = Style.BRIGHT
RED = Fore.RED + BOLD
GREEN = Fore.GREEN + BOLD
BLUE = Fore.BLUE + BOLD
RESET = Style.RESET_ALL

INDENT1 = " " * 3
INDENT2 = " " * 7

def _directory_is_git_repo(directory_path):
    """Check if a directory is a git repository."""
    if os.path.isdir(directory_path):
        git_subfolder = os.path.join(directory_path, ".git")
        if os.path.isdir(git_subfolder):  # Check for path/to/repository/.git
            return True
    return False

def _update_repository(repo_path, repo_name):
    """Update a single git repository by pulling from the remote."""
    def _exec_shell(command):
        """Execute a shell command and get the output."""
        command = shlex.split(command)
        result = subprocess.check_output(command, stderr=subprocess.STDOUT)
        if result:
            result = result[:-1]  # Strip newline if command returned anything
        return result

    print(INDENT1, BOLD + repo_name + ":")

    # cd into our folder so git commands target the correct repo:
    os.chdir(repo_path)  # TODO: remove this when using gitpython

    try:
        # Check if there is anything to pull, but don't do it yet:
        dry_fetch = _exec_shell("git fetch --dry-run")
    except subprocess.CalledProcessError:
        print(INDENT2, RED + "Error:" + RESET, "cannot fetch;",
              "do you have a remote repository configured correctly?")
        return

    try:
        last_commit = _exec_shell("git log -n 1 --pretty=\"%ar\"")
    except subprocess.CalledProcessError:
        last_commit = "never"  # Couldn't get a log, so no commits

    if not dry_fetch:  # No new changes to pull
        print(INDENT2, BLUE + "No new changes." + RESET,
              "Last commit was {0}.".format(last_commit))

    else:  # Stuff has happened!
        print(INDENT2, "There are new changes upstream...")
        status = _exec_shell("git status")

        if status.endswith("nothing to commit, working directory clean"):
            print(INDENT2, GREEN + "Pulling new changes...")
            result = _exec_shell("git pull")
            if last_commit == "never":
                print(INDENT2, "The following changes have been made:")
            else:
                print(INDENT2, "The following changes have been made since",
                      last_commit + ":")
            print(result)

        else:
            print(INDENT2, RED + "Warning:" + RESET,
                  "you have uncommitted changes in this repository!")
            print(INDENT2, "Ignoring.")

def _update_directory(dir_path, dir_name, is_bookmark=False):
    """Update a particular directory.

    First, make sure the specified object is actually a directory, then
    determine whether the directory is a git repo on its own or a directory
    of git repositories. If the former, update the single repository; if the
    latter, update all repositories contained within.
    """
    if is_bookmark:
        dir_type = "bookmark"  # Where did we get this directory from?
    else:
        dir_type = "directory"
    dir_long_name = dir_type + ' "' + BOLD + dir_path + RESET + '"'

    try:
        os.listdir(dir_path)  # Test if we can access this directory
    except OSError:
        print(RED + "Error:" + RESET,
              "cannot enter {0}; does it exist?".format(dir_long_name))
        return

    if not os.path.isdir(dir_path):
        if os.path.exists(dir_path):
            print(RED + "Error:" + RESET, dir_long_name, "is not a directory!")
        else:
            print(RED + "Error:" + RESET, dir_long_name, "does not exist!")
        return

    if _directory_is_git_repo(dir_path):
        print(dir_long_name.capitalize(), "is a git repository:")
        _update_repository(dir_path, dir_name)

    else:
        repositories = []

        dir_contents = os.listdir(dir_path)  # Get potential repos in directory
        for item in dir_contents:
            repo_path = os.path.join(dir_path, item)
            repo_name = os.path.join(dir_name, item)
            if _directory_is_git_repo(repo_path):  # Filter out non-repos
                repositories.append((repo_path, repo_name))

        num_of_repos = len(repositories)
        if num_of_repos == 1:
            print(dir_long_name.capitalize(), "contains 1 git repository:")
        else:
            print(dir_long_name.capitalize(),
                  "contains {0} git repositories:".format(num_of_repos))

        repositories.sort()  # Go alphabetically instead of randomly
        for repo_path, repo_name in repositories:
            _update_repository(repo_path, repo_name)

def update_bookmarks(bookmarks):
    """Loop through and update all bookmarks."""
    if bookmarks:
        for bookmark_path, bookmark_name in bookmarks:
            _update_directory(bookmark_path, bookmark_name, is_bookmark=True)
    else:
        print("You don't have any bookmarks configured! Get help with 'gitup -h'.")

def update_directories(paths):
    """Update a list of directories supplied by command arguments."""
    for path in paths:
        path = os.path.abspath(path)  # Convert relative to absolute path
        path_name = os.path.split(path)[1]  # Dir name ("x" in /path/to/x/)
        _update_directory(path, path_name, is_bookmark=False)