#!/usr/bin/env python
# -*- coding: utf-8 -*-

from __future__ import print_function

from argparse import ArgumentParser
import os
import platform
import shutil
import sys


def is_empty_dir(path):
    """
    Checks if any files are present within a directory and all sub-directories.
    """
    for _, _, files in os.walk(path):
        if files:
            return False
    return True


def parse_arguments():
    parser = ArgumentParser(
            description='Uninstalls autojump.')
    parser.add_argument(
            '-n', '--dryrun', action="store_true", default=False,
            help='simulate installation')
    parser.add_argument(
            '-u', '--userdata', action="store_true", default=False,
            help='delete user data')
    parser.add_argument(
            '-d', '--destdir', metavar='DIR',
            help='custom destdir')
    parser.add_argument(
            '-p', '--prefix', metavar='DIR', default='',
            help='custom prefix')
    parser.add_argument(
            '-z', '--zshshare', metavar='DIR', default='functions',
            help='custom zshshare')

    return parser.parse_args()


def remove_custom_installation(args, dryrun=False):
    if not args.destdir:
        return

    bin_dir = os.path.join(args.destdir, args.prefix, 'bin')
    etc_dir = os.path.join(args.destdir, 'etc/profile.d')
    doc_dir = os.path.join(args.destdir, args.prefix, 'share/man/man1')
    icon_dir = os.path.join(args.destdir, args.prefix, 'share/autojump')
    zshshare_dir = os.path.join(args.destdir, args.zshshare)

    if not os.path.exists(icon_dir):
        return

    print("\nFound custom installation...")
    rm(os.path.join(bin_dir, 'autojump'), dryrun)
    rm(os.path.join(bin_dir, 'autojump_data.py'), dryrun)
    rm(os.path.join(bin_dir, 'autojump_utils.py'), dryrun)
    rm(os.path.join(etc_dir, 'autojump.sh'), dryrun)
    rm(os.path.join(etc_dir, 'autojump.bash'), dryrun)
    rm(os.path.join(etc_dir, 'autojump.fish'), dryrun)
    rm(os.path.join(etc_dir, 'autojump.zsh'), dryrun)
    rm(os.path.join(zshshare_dir, '_j'), dryrun)
    rmdir(icon_dir, dryrun)
    rm(os.path.join(doc_dir, 'autojump.1'), dryrun)

    if is_empty_dir(args.destdir):
        rmdir(args.destdir, dryrun)


def remove_system_installation(dryrun=False):
    default_destdir = '/'
    default_prefix = '/usr/local'
    default_zshshare = '/usr/share/zsh/site-functions'

    bin_dir = os.path.join(default_destdir, default_prefix, 'bin')
    etc_dir = os.path.join(default_destdir, 'etc/profile.d')
    doc_dir = os.path.join(default_destdir, default_prefix, 'share/man/man1')
    icon_dir = os.path.join(default_destdir, default_prefix, 'share/autojump')
    zshshare_dir = os.path.join(default_destdir, default_zshshare)

    if not os.path.exists(icon_dir):
        return

    print("\nFound system installation...")

    if os.geteuid() != 0:
        print("Please rerun as root for system-wide uninstall, skipping...",
              file=sys.stderr)
        return

    rm(os.path.join(bin_dir, 'autojump'), dryrun)
    rm(os.path.join(bin_dir, 'autojump_data.py'), dryrun)
    rm(os.path.join(bin_dir, 'autojump_utils.py'), dryrun)
    rm(os.path.join(etc_dir, 'autojump.sh'), dryrun)
    rm(os.path.join(etc_dir, 'autojump.bash'), dryrun)
    rm(os.path.join(etc_dir, 'autojump.fish'), dryrun)
    rm(os.path.join(etc_dir, 'autojump.zsh'), dryrun)
    rm(os.path.join(zshshare_dir, '_j'), dryrun)
    rmdir(icon_dir, dryrun)
    rm(os.path.join(doc_dir, 'autojump.1'), dryrun)


def remove_user_data(dryrun=False):
    if platform.system() == 'Darwin':
        data_home = os.path.join(
                        os.path.expanduser('~'),
                        'Library',
                        'autojump')
    else:
        data_home = os.getenv(
                'XDG_DATA_HOME',
                os.path.join(
                        os.path.expanduser('~'),
                        '.local',
                        'share',
                        'autojump'))

    if os.path.exists(data_home):
        print("\nFound user data...")
        rmdir(data_home, dryrun)


def remove_user_installation(dryrun=False):
    default_destdir = os.path.join(os.path.expanduser("~"), '.autojump')
    if os.path.exists(default_destdir):
        print("\nFound user installation...")
        rmdir(default_destdir, dryrun)


def rm(path, dryrun):
    if os.path.exists(path):
        print("deleting file:", path)
        if not dryrun:
            os.remove(path)


def rmdir(path, dryrun):
    if os.path.exists(path):
        print("deleting directory:", path)
        if not dryrun:
            shutil.rmtree(path)


def main(args):
    if args.dryrun:
        print("Uninstalling autojump (DRYRUN)...")
    else:
        print("Uninstalling autojump...")

    remove_user_installation(args.dryrun)
    remove_system_installation(args.dryrun)
    remove_custom_installation(args, args.dryrun)
    if args.userdata:
        remove_user_data(args.dryrun)


if __name__ == "__main__":
    sys.exit(main(parse_arguments()))