#!/usr/bin/env python

import os
import re
import sys
from datetime import datetime

import click

from ordigi.config import Config
from ordigi import constants
from ordigi import log
from ordigi.database import Db
from ordigi.collection import Collection
from ordigi.geolocation import GeoLocation
from ordigi.media import Media, get_all_subclasses
from ordigi.summary import Summary


def print_help(command):
    click.echo(command.get_help(click.Context(sort)))


@click.command('sort')
@click.option('--debug', default=False, is_flag=True,
              help='Override the value in constants.py with True.')
@click.option('--dry-run', default=False, is_flag=True,
              help='Dry run only, no change made to the filesystem.')
@click.option('--destination', '-d', type=click.Path(file_okay=False),
              default=None, help='Sort files into this directory.')
@click.option('--clean', '-C', default=False, is_flag=True,
              help='Clean empty folders')
@click.option('--copy', '-c', default=False, is_flag=True,
              help='True if you want files to be copied over from src_dir to\
              dest_dir rather than moved')
@click.option('--exclude-regex', '-e', default=set(), multiple=True,
              help='Regular expression for directories or files to exclude.')
@click.option('--filter-by-ext', '-f', default=set(), multiple=True, help='''Use filename
        extension to filter files for sorting. If value is '*', use
        common media file extension for filtering. Ignored files remain in
        the same directory structure''' )
@click.option('--ignore-tags', '-i', default=set(), multiple=True,
              help='Specific tags or group that will be ignored when\
              searching for file data. Example \'File:FileModifyDate\' or \'Filename\'' )
@click.option('--max-deep', '-m', default=None,
              help='Maximum level to proceed. Number from 0 to desired level.')
@click.option('--remove-duplicates', '-R', default=False, is_flag=True,
              help='True to remove files that are exactly the same in name\
                      and a file hash')
@click.option('--reset-cache', '-r', default=False, is_flag=True,
              help='Regenerate the hash.json and location.json database ')
@click.option('--verbose', '-v', default=False, is_flag=True,
              help='True if you want to see details of file processing')
@click.argument('paths', required=True, nargs=-1, type=click.Path())
def _sort(debug, dry_run, destination, clean, copy, exclude_regex, filter_by_ext, ignore_tags,
        max_deep, remove_duplicates, reset_cache, verbose, paths):
    """Sort files or directories by reading their EXIF and organizing them
    according to ordigi.conf preferences.
    """

    if copy:
        mode = 'copy'
    else:
        mode = 'move'

    logger = log.get_logger(verbose, debug)

    if max_deep is not None:
        max_deep = int(max_deep)

    cache = True
    if reset_cache:
        cache = False

    if len(paths) > 1:
        if not destination:
            # Use last path argument as destination
            destination = paths[-1]
            paths = paths[0:-1]
    elif paths:
        # Source and destination are the same
        destination = paths[0]
    else:
        logger.error(f'`ordigi sort` need at least one path argument')
        sys.exit(1)

    paths = set(paths)
    filter_by_ext = set(filter_by_ext)

    destination = os.path.abspath(os.path.expanduser(destination))

    if not os.path.exists(destination):
        logger.error(f'Directory {destination} does not exist')

    config = Config(constants.CONFIG_FILE)
    opt = config.get_options()

    # if no exclude list was passed in we check if there's a config
    if len(exclude_regex) == 0:
        exclude_regex = opt['exclude_regex']
    exclude_regex_list = set(exclude_regex)

    # Initialize Db
    db = Db(destination)

    collection = Collection(opt['path_format'], destination, cache, 
            opt['day_begins'], dry_run, exclude_regex_list, filter_by_ext,
            logger, max_deep, mode)

    loc = GeoLocation(opt['geocoder'], opt['prefer_english_names'],
            opt['timeout'])

    summary, has_errors = collection.sort_files(paths, db, loc,
            remove_duplicates, ignore_tags)

    if clean:
        remove_empty_folders(destination, logger)

    if verbose or debug:
        summary.write()

    if has_errors:
        sys.exit(1)


def remove_empty_folders(path, logger, remove_root=True):
  'Function to remove empty folders'
  if not os.path.isdir(path):
    return

  # remove empty subfolders
  files = os.listdir(path)
  if len(files):
    for f in files:
      fullpath = os.path.join(path, f)
      if os.path.isdir(fullpath):
        remove_empty_folders(fullpath, logger)

  # if folder empty, delete it
  files = os.listdir(path)
  if len(files) == 0 and remove_root:
    logger.info(f"Removing empty folder: {path}")
    os.rmdir(path)


@click.command('clean')
@click.option('--debug', default=False, is_flag=True,
              help='Override the value in constants.py with True.')
@click.option('--dedup-regex', '-d', default=set(), multiple=True,
              help='Regex to match duplicate strings parts')
@click.option('--dry-run', default=False, is_flag=True,
              help='Dry run only, no change made to the filesystem.')
@click.option('--folders', '-f', default=False, is_flag=True,
              help='Remove empty folders')
@click.option('--max-deep', '-m', default=None,
              help='Maximum level to proceed. Number from 0 to desired level.')
@click.option('--path-string', '-p', default=False, is_flag=True,
              help='Deduplicate path string')
@click.option('--remove-duplicates', '-R', default=False, is_flag=True,
              help='True to remove files that are exactly the same in name\
                      and a file hash')
@click.option('--root', '-r', type=click.Path(file_okay=False),
              default=None, help='Root dir of media collection. If not set, use path')
@click.option('--verbose', '-v', default=False,
              help='True if you want to see details of file processing')
@click.argument('path', required=True, nargs=1, type=click.Path())
def _clean(debug, dedup_regex, dry_run, folders, max_deep, path_string, remove_duplicates, root, verbose, path):
    """Remove empty folders
    Usage: clean [--verbose|--debug] directory [removeRoot]"""

    logger = log.get_logger(verbose, debug)

    clean_all = False
    if not folders:
        clean_all = True
    if not root:
        root = path

    if clean_all or folders:
        remove_empty_folders(path, logger)

    config = Config(constants.CONFIG_FILE)
    opt = config.get_options()

    if path_string:
        # Initialize Db
        db = Db(root)
        collection = Collection(opt['path_format'], root, dry_run=dry_run, logger=logger, max_deep=max_deep, mode='move')
        dedup_regex = list(dedup_regex)
        summary, has_errors = collection.dedup_regex(path, dedup_regex, db, logger, remove_duplicates)

    if verbose or debug:
        summary.write()

    if has_errors:
        sys.exit(1)


@click.command('generate-db')
@click.option('--path', type=click.Path(file_okay=False),
              required=True, help='Path of your photo library.')
@click.option('--debug', default=False, is_flag=True,
              help='Override the value in constants.py with True.')
def _generate_db(path, debug):
    """Regenerate the hash.json database which contains all of the sha256 signatures of media files.
    """
    # TODO
    pass


@click.command('verify')
@click.option('--path', type=click.Path(file_okay=False),
              required=True, help='Path of your photo library.')
@click.option('--debug', default=False, is_flag=True,
              help='Override the value in constants.py with True.')
def _verify(path, debug):
    """Verify hashes"""
    # TODO
    pass


@click.command('compare')
@click.option('--debug', default=False, is_flag=True,
              help='Override the value in constants.py with True.')
@click.option('--dry-run', default=False, is_flag=True,
              help='Dry run only, no change made to the filesystem.')
@click.option('--find-duplicates', '-f', default=False, is_flag=True)
@click.option('--output-dir', '-o', default=False, is_flag=True, help='output\
        dir')
@click.option('--remove-duplicates', '-r', default=False, is_flag=True)
@click.option('--revert-compare', '-R', default=False, is_flag=True, help='Revert\
        compare')
@click.option('--root', '-r', type=click.Path(file_okay=False),
              default=None, help='Root dir of media collection. If not set, use path')
@click.option('--similar-to', '-s', default=False, help='Similar to given\
        image')
@click.option('--similarity', '-S', default=80, help='Similarity level for\
        images')
@click.option('--verbose', '-v', default=False, is_flag=True,
              help='True if you want to see details of file processing')
@click.argument('path', nargs=1, required=True)
def _compare(debug, dry_run, find_duplicates, output_dir, remove_duplicates,
        revert_compare, root, similar_to, similarity, verbose, path):
    '''Compare files in directories'''

    logger = log.get_logger(verbose, debug)

    if not root:
        root = path

    config = Config(constants.CONFIG_FILE)
    opt = config.get_options()

    # Initialize Db
    db = Db(root)

    collection = Collection(path_format, root, mode='move', dry_run=dry_run, logger=logger)

    if revert_compare:
        summary, has_errors = collection.revert_compare(path, db, dry_run)
    else:
        summary, has_errors = collection.sort_similar_images(path, db,
                similarity)

    if verbose or debug:
        summary.write()

    if has_errors:
        sys.exit(1)


@click.group()
def main():
    pass


main.add_command(_clean)
main.add_command(_compare)
main.add_command(_sort)
main.add_command(_generate_db)
main.add_command(_verify)


if __name__ == '__main__':
    main()