import re
from time import sleep

import requests
from loguru import logger as log

from mangadlp import utils


class Mangadex:
    """Mangadex API Class.
    Get infos for a manga from mangadex.org

    Args:
        url_uuid (str): URL or UUID of the manga
        language (str): Manga language with country codes. "en" --> english
        forcevol (bool): Force naming of volumes. Useful for mangas where chapters reset each volume

    Attributes:
        api_name (str): Name of the API
        manga_uuid (str): UUID of the manga, without the url part
        manga_data (dict): Infos of the manga. Name, title etc
        manga_title (str): The title of the manga, sanitized for all file systems
        manga_chapter_data (dict): All chapter data of the manga. Volumes, chapters, chapter uuids and chapter names
        chapter_list (list): A list of all available chapters for the language

    """

    # api information
    api_base_url = "https://api.mangadex.org"
    img_base_url = "https://uploads.mangadex.org"

    # get infos to initiate class
    def __init__(self, url_uuid: str, language: str, forcevol: bool):
        # static info
        self.api_name = "Mangadex"

        self.url_uuid = url_uuid
        self.language = language
        self.forcevol = forcevol

        # api stuff
        self.api_content_ratings = "contentRating[]=safe&contentRating[]=suggestive&contentRating[]=erotica&contentRating[]=pornographic"
        self.api_language = f"translatedLanguage[]={self.language}"
        self.api_additions = f"{self.api_language}&{self.api_content_ratings}"

        # infos from functions
        self.manga_uuid = self.get_manga_uuid()
        self.manga_data = self.get_manga_data()
        self.manga_title = self.get_manga_title()
        self.manga_chapter_data = self.get_chapter_data()
        self.chapter_list = self.create_chapter_list()

    # get the uuid for the manga
    def get_manga_uuid(self) -> str:
        # isolate id from url
        uuid_regex = re.compile(
            "[a-z0-9]{8}-[a-z0-9]{4}-[a-z0-9]{4}-[a-z0-9]{4}-[a-z0-9]{12}"
        )
        # try to get uuid in string
        try:
            uuid = uuid_regex.search(self.url_uuid)[0]  # type: ignore
        except Exception as exc:
            log.error("No valid UUID found")
            raise exc

        return uuid

    # make initial request
    def get_manga_data(self) -> dict:
        log.debug(f"Getting manga data for: {self.manga_uuid}")
        counter = 1
        while counter <= 3:
            try:
                response = requests.get(
                    f"{self.api_base_url}/manga/{self.manga_uuid}", timeout=10
                )
            except Exception as exc:
                if counter >= 3:
                    log.error("Maybe the MangaDex API is down?")
                    raise exc
                log.error("Mangadex API not reachable. Retrying")
                sleep(2)
                counter += 1
            else:
                break
        # check if manga exists
        if response.json()["result"] != "ok":
            log.error("Manga not found")
            raise KeyError

        return response.json()["data"]

    # get the title of the manga (and fix the filename)
    def get_manga_title(self) -> str:
        log.debug(f"Getting manga title for: {self.manga_uuid}")
        attributes = self.manga_data["attributes"]
        # try to get the title in requested language
        try:
            title = attributes["title"][self.language]
        except KeyError:
            log.info("Manga title not found in requested language. Trying alt titles")
        else:
            log.debug(f"Language={self.language}, Title='{title}'")
            return utils.fix_name(title)

        # search in alt titles
        try:
            log.debug(f"Alt titles: {attributes['altTitles']}")
            for item in attributes["altTitles"]:
                if item.get(self.language):
                    alt_title = item
                    break
            title = alt_title[self.language]
        except KeyError:
            log.warning(
                "Manga title also not found in alt titles. Falling back to english title"
            )
        else:
            log.debug(f"Language={self.language}, Alt-title='{title}'")
            return utils.fix_name(title)

        title = attributes["title"]["en"]
        log.debug(f"Language=en, Fallback-title='{title}'")
        return utils.fix_name(title)

    # check if chapters are available in requested language
    def check_chapter_lang(self) -> int:
        log.debug(f"Checking for chapters in specified language for: {self.manga_uuid}")
        r = requests.get(
            f"{self.api_base_url}/manga/{self.manga_uuid}/feed?limit=0&{self.api_additions}",
            timeout=10,
        )
        try:
            total_chapters = r.json()["total"]
        except Exception as exc:
            log.error(
                "Error retrieving the chapters list. Did you specify a valid language code?"
            )
            raise exc
        else:
            if total_chapters == 0:
                log.error("No chapters available to download in specified language")
                raise KeyError

        log.debug(f"Total chapters={total_chapters}")
        return total_chapters

    # get chapter data like name, uuid etc
    def get_chapter_data(self) -> dict:
        log.debug(f"Getting chapter data for: {self.manga_uuid}")
        api_sorting = "order[chapter]=asc&order[volume]=asc"
        # check for chapters in specified lang
        total_chapters = self.check_chapter_lang()

        chapter_data = {}
        last_volume, last_chapter = ("", "")
        offset = 0
        while offset < total_chapters:  # if more than 500 chapters
            r = requests.get(
                f"{self.api_base_url}/manga/{self.manga_uuid}/feed?{api_sorting}&limit=500&offset={offset}&{self.api_additions}",
                timeout=10,
            )
            for chapter in r.json()["data"]:
                attributes: dict = chapter["attributes"]
                # chapter infos from feed
                chapter_num = attributes.get("chapter") or ""
                chapter_vol = attributes.get("volume") or ""
                chapter_uuid = chapter.get("id") or ""
                chapter_name = attributes.get("title") or ""
                chapter_external = attributes.get("externalUrl") or ""

                # check for chapter title and fix it
                if chapter_name:
                    chapter_name = utils.fix_name(chapter_name)
                # check if the chapter is external (can't download them)
                if chapter_external:
                    log.debug(f"Chapter is external. Skipping: {chapter_uuid}")
                    continue

                # check if its duplicate from the last entry
                if last_volume == chapter_vol and last_chapter == chapter_num:
                    continue

                # export chapter data as a dict
                chapter_index = (
                    chapter_num if not self.forcevol else f"{chapter_vol}:{chapter_num}"
                )
                chapter_data[chapter_index] = [
                    chapter_uuid,
                    chapter_vol,
                    chapter_num,
                    chapter_name,
                ]
                # add last chapter to duplicate check
                last_volume, last_chapter = (chapter_vol, chapter_num)

            # increase offset for mangas with more than 500 chapters
            offset += 500

        return chapter_data

    # get images for the chapter (mangadex@home)
    def get_chapter_images(self, chapter: str, wait_time: float) -> list:
        log.debug(f"Getting chapter images for: {self.manga_uuid}")
        athome_url = f"{self.api_base_url}/at-home/server"
        chapter_uuid = self.manga_chapter_data[chapter][0]

        # retry up to two times if the api applied rate limits
        api_error = False
        counter = 1
        while counter <= 3:
            try:
                r = requests.get(f"{athome_url}/{chapter_uuid}", timeout=10)
                api_data = r.json()
                if api_data["result"] != "ok":
                    log.error(f"No chapter with the id {chapter_uuid} found")
                    api_error = True
                    raise IndexError
                if api_data["chapter"]["data"] is None:
                    log.error(f"No chapter data found for chapter {chapter_uuid}")
                    api_error = True
                    raise IndexError
                # no error
                api_error = False
                break
            except Exception:
                if counter >= 3:
                    api_error = True
                log.error("Retrying in a few seconds")
                counter += 1
                sleep(wait_time + 2)
        # check if result is ok
        else:
            if api_error:
                return []

        chapter_hash = api_data["chapter"]["hash"]
        chapter_img_data = api_data["chapter"]["data"]

        # get list of image urls
        image_urls = []
        for image in chapter_img_data:
            image_urls.append(f"{self.img_base_url}/data/{chapter_hash}/{image}")

        sleep(wait_time)

        return image_urls

    # create list of chapters
    def create_chapter_list(self) -> list:
        log.debug(f"Creating chapter list for: {self.manga_uuid}")
        chapter_list = []
        for index, _ in self.manga_chapter_data.items():
            chapter_info: dict = self.get_chapter_infos(index)
            chapter_number: str = chapter_info["chapter"]
            volume_number: str = chapter_info["volume"]
            if self.forcevol:
                chapter_list.append(f"{volume_number}:{chapter_number}")
            else:
                chapter_list.append(chapter_number)

        return chapter_list

    # create easy to access chapter infos
    def get_chapter_infos(self, chapter: str) -> dict:
        chapter_uuid: str = self.manga_chapter_data[chapter][0]
        chapter_vol: str = self.manga_chapter_data[chapter][1]
        chapter_num: str = self.manga_chapter_data[chapter][2]
        chapter_name: str = self.manga_chapter_data[chapter][3]
        log.debug(f"Getting chapter infos for: {chapter_uuid}")

        return {
            "uuid": chapter_uuid,
            "volume": chapter_vol,
            "chapter": chapter_num,
            "name": chapter_name,
        }