"""
Add a new item to a media catalogue, using various APIs.
"""

import json
import logging
import os
import re
import time
from datetime import datetime
import requests
from dotenv import load_dotenv

authors = []

def setup_logger(name="add_item"):
    """Set up the logger for console and file"""

    logr = logging.getLogger(name)

    c_handler = logging.StreamHandler()
    f_handler = logging.FileHandler("./logs/run.log")

    logging.root.setLevel(logging.INFO)
    c_handler.setLevel(logging.INFO)
    f_handler.setLevel(logging.WARNING)

    c_format = logging.Formatter("%(name)s - %(levelname)s - %(message)s")
    f_format = logging.Formatter("%(asctime)s - %(name)s - %(levelname)s - %(message)s")

    c_handler.setFormatter(c_format)
    f_handler.setFormatter(f_format)

    logr.addHandler(c_handler)
    logr.addHandler(f_handler)

    return logr


logger = setup_logger()

load_dotenv()

TMDB_API_KEY = os.getenv("TMDB_API_KEY")
TVDB_API_KEY = os.getenv("TVDB_API_KEY")

if "" == TMDB_API_KEY:
    logger.error("TMDB API key not found")
if "" == TVDB_API_KEY:
    logger.error("TVDB API key not found")


def return_if_exists(item_id, media_type, log) -> dict|None:
    """Returns an item if it exists in the requested log"""

    logger.info(f"Checking for '{item_id}' in '{log}'…")
    with open(f"./data/{media_type}/{log}.json", "r", encoding='utf-8') as log_file:
        log_items = json.load(log_file)

    existing_items = [log_item for log_item in log_items if "id" in log_item and log_item['id'] == int(item_id)]
    if len(existing_items) > 0:
        logger.info(f"Found item in '{log}'")
        return existing_items[-1]
    logger.info(f"'{item_id}' not found in '{log}'")


def delete_existing(item_id, media_type, log) -> None:
    """Deletes an item from a log if it matches the ID"""

    logger.info(f"Deleting '{item_id}' from '{log}'…")
    with open(f"./data/{media_type}/{log}.json", "r", encoding='utf-8') as log_file:
        log_items = json.load(log_file)

    old_len = len(log_items)
    log_items = [log_item for log_item in log_items if "id" not in log_item or ("id" in log_item and log_item['id'] != int(item_id))]
    if len(log_items) < (old_len - 1):
        raise Exception("More than one deletion made, discarding…")

    with open(f"./data/{media_type}/{log}.json", "w", encoding='utf-8') as log_file:
        json.dump(log_items, log_file, indent=4)
    logger.info(f"'{item_id}' deleted from '{log}'")


def check_for_existing(item_id, media_type, log) -> dict[dict, str]:
    """Check for an existing item and move it to the specified log if requested"""

    logger.info(f"Checking for '{item_id}' in logs…")

    # Check in specified log
    existing_item = return_if_exists(item_id, media_type, log)

    if existing_item is not None:
        if "log" == log:
            existing_item["is_repeat"] = True
            return existing_item, None

    for log_to_check in [p_log for p_log in ["log", "current", "wishlist"] if p_log != log]:
        if ("current" == log_to_check and media_type in ["books", "games", "tv-series"]) or ("wishlist" == log_to_check and media_type in ["books", "games", "films", "tv-series"]):
            existing_item = return_if_exists(item_id, media_type, log_to_check)
            if existing_item is not None:
                return existing_item, log_to_check

    return None, None


def add_item_to_log(item_id, media_type, log) -> None:
    """Add a film, book, TV series or TV episode to a log"""

    logger.info(f"Processing {item_id}…")

    item, log_to_delete = check_for_existing(item_id, media_type, log)

    if item is None:
        item = import_by_id(item_id, media_type)
        if item is None:
            raise Exception("No item found")

    if log in ["log", "current"]:
        if "date_started" not in item and media_type in ["books", "tv-series", "games"]:
            date_started = ""
            while re.search("[0-9]{4}-[0-9]{2}-[0-9]{2}", date_started) is None:
                date_started = input("Enter date started [YYYY-MM-DD, t for today]: ")
                if "t" == date_started:
                    date_started = datetime.today().strftime("%Y-%m-%d")
            item["date_started"] = date_started

        if "date_finished" not in item and "log" == log:
            date_finished = ""
            while re.search("[0-9]{4}-[0-9]{2}-[0-9]{2}", date_finished) is None:
                date_finished = input("Enter date finished [YYYY-MM-DD, t for today]: ")
                if "t" == date_finished:
                    date_finished = datetime.today().strftime("%Y-%m-%d")
            item["date_finished"] = date_finished

        if "is_repeat" not in item:
            is_repeat = ""
            while is_repeat not in ["y", "n"]:
                is_repeat = input("Is this a repeat entry? [y/n]: ")
                if "y" == is_repeat:
                    item["is_repeat"] = True

        if "added_by_id" not in item:
            item["added_by_id"] = item_id

    if "comments" not in item:
        comments = input("Enter comments (optional): ")
        if "" != comments:
            item["comments"] = comments

    # Validation step
    print(f"{media_type} data to add:\n")
    print(json.dumps(item, indent=4))
    if "y" != input("\nDoes this look correct? [y]: "):
        return

    # Save changes
    logger.info(f"Adding {media_type} to {log}…")

    with open(f"./data/{media_type}/{log}.json", "r", encoding='utf-8') as log_file:
        log_items = json.load(log_file)

    log_items.insert(0, item)

    with open(f"./data/{media_type}/{log}.json", "w", encoding='utf-8') as log_file:
        json.dump(log_items, log_file, indent=4)

    logger.info(f"Added {media_type} {item_id} to {log}")

    if log_to_delete is not None:
        delete_existing(item_id, media_type, log_to_delete)


def import_by_id(import_id, media_type) -> dict:
    """Import from the appropriate API by unique ID"""

    if media_type in ["films", "tv-series"]:
        return import_from_tmdb_by_id(import_id, media_type)

    if media_type in ["tv-episodes"]:
        return #import_from_tvdb_by_id(import_id, media_type)

    if media_type in ["books"]:
        return import_from_openlibrary_by_id(import_id, media_type)


def import_from_tmdb_by_id(tmdb_id, media_type) -> dict:
    """Retrieve a film, TV show or TV episode from TMDB using an IMDB ID"""

    api_path = "movie" if "films" == media_type else "tv"
    api_url = f"https://api.themoviedb.org/3/{api_path}/{tmdb_id}"

    # Sending API request
    response = requests.get(
        api_url,
        headers={"Authorization": f"Bearer {TMDB_API_KEY}"},
        timeout=15
    )

    # Process the response
    if 200 == response.status_code:
        logger.debug(response.status_code)

    elif 429 == response.status_code:
        time.sleep(2)
        return import_from_tmdb_by_id(tmdb_id, media_type)

    else:
        raise Exception(f"Error {response.status_code}: {response.text}")

    if "tv-episodes" == media_type:
        raise Exception("TV Episodes are TODO!")

    response_data = json.loads(response.text)

    if 1 == len(response_data):
        item = response_data[0]

    elif 0 == len(response_data):
        raise Exception(f"Returned no results for {tmdb_id}")

    # Modify the returned result to add additional data
    return cleanup_result(item, media_type)


def import_from_openlibrary_by_id(isbn, media_type) -> dict:
    """Retrieve a film, TV show or TV episode from TMDB using an IMDB ID"""

    logging.info(f"Importing '{isbn}'…")

    api_url = f"https://openlibrary.org/isbn/{isbn}"

    # Sending API request
    response = requests.get(api_url, headers={"accept": "application/json"}, timeout=15)

    # Process the response
    if 200 == response.status_code:
        logger.debug(response.status_code)

    elif 429 == response.status_code:
        time.sleep(2)
        return import_from_openlibrary_by_id(isbn, media_type)

    elif 404 == response.status_code:
        logger.error(f"{response.status_code}: Not Found for ISBN '{isbn}'")
        return None
    else:
        raise Exception(f"Error {response.status_code}: {response.text}")

    item = json.loads(response.text)

    for key in ["authors", "works"]:
        if key in item:
            for i, sub_item in enumerate(item[key]):
                item[key][i] = import_from_openlibrary_by_ol_key(sub_item["key"])


    if "works" in item:
        if len(item["works"]) > 1:
            raise Exception(f"Multiple works found for {isbn}")

        item["work"] = item["works"][0]
        del item["works"]

    # Rate limiting
    time.sleep(1)

    # Modify the returned result to add additional data
    return cleanup_result(item, media_type)


def import_from_openlibrary_by_ol_key(key) -> dict:
    """Retrieves an item (author or work, NOT edition) from OpenLibrary using an OL key"""

    logger.info(f"Retrieving {key}…")
    _, mode, ol_id = key.split("/")

    if "authors" == mode:
        with open(f"./scripts/caching/authors.json", "r", encoding='utf-8') as authors_cache:
            cached_authors = json.load(authors_cache)

    if mode in ["works", "authors"]:
        if "authors" == mode:
            matched_cached_authors = [aut for aut in cached_authors if aut['id'] == ol_id]
            if len(matched_cached_authors) == 1:
                logging.info(f"Found cached author '{matched_cached_authors[0]['name']}'")
                return matched_cached_authors[0]

        api_url = f"https://openlibrary.org{key}"

        # Sending API request
        response = requests.get(api_url, headers={"accept": "application/json"}, timeout=15)

        # Process the response
        if 200 == response.status_code:
            logger.debug(response.status_code)

        elif 429 == response.status_code:
            time.sleep(2)
            import_from_openlibrary_by_ol_key(key)

        else:
            raise Exception(f"Error {response.status_code}: {response.text}")

        # Rate limiting
        time.sleep(1)

        item = json.loads(response.text)

        if "authors" == mode:
            author = {"id": ol_id, "name": item["name"]}

            if "personal_name" in item:
                if item["name"] != item["personal_name"]:
                    author["personal_name"] = item["personal_name"]

            logger.info(f"Caching author '{author['name']}'…")
            cached_authors.append(author)
            with open(
                f"./scripts/caching/authors.json",
                "w",
                encoding='utf-8'
            ) as authors_cache:
                json.dump(cached_authors, authors_cache, indent=4)
            logger.info(f"Author '{author['name']}' cached!")

            return author

        if "works" == mode:
            work = {"id": ol_id, "title": item["title"]}

            for result_key in ["first_publish_date", "subjects"]:
                if result_key in item:
                    work[result_key] = item[result_key]

            return work

    else:
        raise Exception(f"Unknown OpenLibrary key '{mode}'")


def cleanup_result(item, media_type) -> dict:
    """Process a film, TV series, TV episode or book returned by their
    respective APIs by removing unnecessary fields and adding others"""

    for field_name in [
        "adult",  # TMDB
        "backdrop_path",  # TMDB
        "copyright_date",  # OpenLibrary
        "classifications",  # OpenLibrary
        "created",  # OpenLibrary
        "dewey_decimal_class", # OpenLibary
        "episode_type",  # TMDB
        "first_sentence",  # OpenLibrary
        "genre_ids",  # TMDB
        "identifiers",  # OpenLibrary
        "media_type",  # TMDB
        "last_modified",  # OpenLibrary
        "latest_revision",  # OpenLibrary
        "lc_classifications",  # OpenLibrary
        "lccn", # OpenLibrary
        "local_id",  # OpenLibrary
        "notes", # OpenLibrary
        "ocaid",  # OpenLibrary
        "oclc_numbers",  # OpenLibrary
        "pagination", # OpenLibrary
        "physical_dimensions", # OpenLibrary
        "popularity",  # TMDB
        "production_code",  # TMDB
        "revision",  # OpenLibrary
        "runtime",  # TMDB
        "source_records",  # OpenLibrary
        "still_path",  # TMDB
        "table_of_contents", # OpenLibrary
        "type",  # OpenLibrary
        "uri_descriptions", # OpenLibrary
        "url", # OpenLibrary
        "video",  # TMDB
        "vote_average",  # TMDB
        "vote_count",  # TMDB
        "weight", # OpenLibrary
    ]:
        if field_name in item:
            del item[field_name]

    if media_type in ["films", "tv-series"]:
        title_key = "name" if "tv-series" == media_type else "title"

        if f"original_{title_key}" in item and "original_language" in item:
            if (
                item[f"original_{title_key}"] == item[title_key]
                and item["original_language"] == "en"
            ):
                del item[f"original_{title_key}"], item["original_language"]

    if "books" == media_type:
        _, _, item["id"] = item["key"].split("/")
        del item["key"]

        for key in ["isbn_10", "isbn_13"]:
            if key in item:
                if len(item[key]) > 1:
                    logger.warning("Multiple ISBN results")

                item[key] = item[key][0]

        if "publish_places" in item:
            item["published_in"] = item["publish_places"]
            del item["publish_places"]

        if "languages" in item:
            item["languages"] = [
                lang["key"].split("/")[2] for lang in item["languages"]
            ]

        if "translation_of" in item:
            if item["translation_of"].split(":")[0].lower() == item["work"]["title"].split(":")[0].lower():
                del item["translation_of"]
            else:
                raise Exception(
                    f"translation_of '{item['translation_of']}' \
                    is different to work title '{item['work']['title']}'"
                )

        if "translated_from" in item:
            if len(item["translated_from"]) > 1:
                raise Exception("Multiple translated_from results")

            item["work"]["original_language"] = item["translated_from"][0][
                "key"
            ].split("/")[2]
            del item["translated_from"]

    if "date_added" not in item:
        item["date_added"] = datetime.today().strftime("%Y-%m-%d")

    return item


def main() -> None:
    """Prompt user to select media type and log to process"""

    media_type = ""
    while media_type not in ["films", "tv-episodes", "tv-series", "books"]:
        media_type = input("Select media type [films|tv-episodes|tv-series|books]: ")

        try:
            item_id = ""
            if "films" == media_type:
                log = ""
                while log not in ["log", "wishlist"]:
                    log = input("Enter log to update [log|wishlist]: ")

                while re.search("[0-9]+", item_id) is None:
                    item_id = input("Enter TMDB ID: ")

            elif "books" == media_type:
                log = ""
                while log not in ["log", "current", "wishlist"]:
                    log = input("Enter log to update [log|current|wishlist]: ")

                while re.search("[0-9]+", item_id) is None:
                    item_id = input("Enter ISBN: ")

            elif "tv-episodes" == media_type:
                log = "log"
                while re.search("[0-9]+", item_id) is None:
                    item_id = input("Enter TVDB ID: ")

            elif "tv-series" == media_type:
                log = ""
                while log not in ["log", "current", "wishlist"]:
                    log = input("Enter log to update [log|current|wishlist]: ")

                while re.search("[0-9]+", item_id) is None:
                    item_id = input("Enter TMDB ID: ")

            add_item_to_log(item_id, media_type, log)

        except Exception:
            logger.exception("Exception occurred")


if __name__ == "__main__":
    main()