#!/usr/bin/python3
"""
Script to downloaded webpages, extract text and merge all of them
together to create one ebook.
"""

import argparse

from importlib import import_module
from urllib.parse import urlparse
from typing import List

from chapter import Chapter
from ebook import Ebook


class NovelDownload:
    def __init__(self, url):
        self.url = url

        self.title : str = ""
        self.author : str = ""

        self.chapters : List[Chapter] = list()
        self.parser = None

        if not self.loadModule():
            print("Url is not supported")

    def loadModule(self):
        url = urlparse(self.url)
        moduleName = url.netloc.replace(".", "_")

        # import parser
        try:
            parserPackage = import_module('parsers.' + moduleName)
        except ImportError:
            print("Parser module not found: " + moduleName)
            return False
        # return getattr(module, name)

        self.parser = parserPackage.Parser(self.url)

        return True

    def download(self):
        if not self.parser:
            print("There was an error")
            return

        self.parser.prepare()
        self.author = self.parser.getAuthor()
        self.title = self.parser.getTitle()

        for x in range(1, len(self.parser.getUrls()), 1):
            number, title, content = self.parser.nextChapter()
            if number == -1:
                number = x
            print("{number} - {title}".format(number=number, title=title))
            chapter = Chapter(title, content, number)
            self.chapters.append(chapter)

    def save(self):
        book = Ebook(self.title, self.chapters, self.author)
        book.create()


def main():
    parser = argparse.ArgumentParser(description='Webnovel downloader')
    parser.add_argument('-u', '--url', metavar='URL', type=str, nargs=1, required=True,
                        help='Url of the index page or first chapter, depends on parser support.')
    parser.add_argument('--version', action='version', version='%(prog)s 1.0.0')
    args = parser.parse_args()

    nd = NovelDownload(args.url[0])

    # Download all chapters one by one
    print("Downloading...")
    nd.download()
    print("Saving...")
    nd.save()
    print("Done")


# if yused standalone start the script
if __name__ == '__main__':
    main()