"""MIT License

Copyright (c) 2019 David Luevano Alvarado

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"""

import os

# Project specific imports.
from tirante.get_chapters_list import get_chapters_list
from tirante.chapters_manager import chapters_csv_to_list
from tirante.chapter_images_manager import chapter_images_list_to_csv


def update_database(main_url,
                    manga_name_url,
                    manga_name,
                    manga_dir,
                    manga_data_dir):
    """
    Updates the database already created, adding missing ones.
    main_url: Main webpage name (source).
    manga_name_url: Name of the manga in the url format
    that's used by the webpage.
    manga_name: Actual name of the manga, as it appears in the webpage.
    manga_dir: Main manga folder in computer, subfolders here will be created.
    manga_data_dir: Main manga data folder in computer.
    """

    # A better "naming" for the manga, for use with folder creation.
    # As well as the name of the main database.
    m_name = '_'.join(word.lower() for word in manga_name.split())
    m_name_ext = ''.join([m_name, '.csv'])

    # Navigate to where the main data folder is,
    # then to where the manga folder is.
    os.chdir(manga_data_dir)
    try:
        os.mkdir(m_name)
        os.chdir(m_name)
    except FileExistsError:
        print(''.join([m_name,
                       ' folder already exists.']))
        os.chdir(m_name)

    # Get a list of files present in path.
    data_list_dir = os.listdir()

    # First, download the data from the web.
    new_chapter_list = get_chapters_list(main_url=main_url,
                                         manga_name_url=manga_name_url,
                                         manga_name=manga_name,
                                         reverse_sorted=False)

    # And then, read the current database.
    last_chapter = chapters_csv_to_list(m_name_ext)[-1]

    # The missing chapters.
    missing_chapters = []
    for chapter in new_chapter_list:
        # If we get to the last acquired chapter, exit loop.
        if chapter == last_chapter:
            break
        missing_chapters.append(chapter)

    # Reverse the order.
    missing_chapters = missing_chapters[::-1]

    # Write the last chapters to already existing csv file.
    # No need for checking if items are present,
    # since that's checked on the last steps,
    # that's how missing_chapters is acquired.
    with open(m_name_ext, 'a') as outcsv:
        for chapter in missing_chapters:
            outcsv.write(''.join([chapter[0], ',', chapter[1], '\n']))

    # Create the missing csv data files for each chapter.
    for chapter in missing_chapters:
        # Get the list for the images of each chapter.
        chapter_name_ext = ''.join([chapter[1], '.csv'])
        if chapter_name_ext not in data_list_dir:
            chapter_images_list_to_csv(chapter)
        else:
            print(''.join([chapter_name_ext, ' already exists.']))