import sys
import functools
import pydash
import requests
import re
import time
import os
import json
import xmltodict
from unidecode import unidecode as uc
from requests.exceptions import HTTPError, Timeout
from typing import Final

from config import IGDB_CLIENT_ID, IGDB_CLIENT_SECRET
from utils import get_file_name_with_no_tags as get_search_term
from logger.logger import log
from utils.cache import cache
from tasks.update_switch_titledb import update_switch_titledb_task
from tasks.update_mame_xml import update_mame_xml_task

MAIN_GAME_CATEGORY: Final = 0
EXPANDED_GAME_CATEGORY: Final = 10
N_SCREENSHOTS: Final = 5
PS2_IGDB_ID: Final = 8
SWITCH_IGDB_ID: Final = 130
ARCADE_IGDB_ID: Final = 52

PS2_OPL_REGEX: Final = r"^([A-Z]{4}_\d{3}\.\d{2})\..*$"
PS2_OPL_INDEX_FILE: Final = os.path.join(
    os.path.dirname(__file__), "fixtures", "ps2_opl_index.json"
)

SWITCH_TITLEDB_REGEX: Final = r"^(70[0-9]{12})$"
SWITCH_TITLEDB_INDEX_FILE: Final = os.path.join(
    os.path.dirname(__file__), "fixtures", "switch_titledb.json"
)

MAME_XML_FILE: Final = os.path.join(os.path.dirname(__file__), "fixtures", "mame.xml")


class IGDBHandler:
    def __init__(self) -> None:
        self.platform_url = "https://api.igdb.com/v4/platforms/"
        self.games_url = "https://api.igdb.com/v4/games/"
        self.covers_url = "https://api.igdb.com/v4/covers/"
        self.screenshots_url = "https://api.igdb.com/v4/screenshots/"
        self.twitch_auth = TwitchAuth()
        self.headers = {
            "Client-ID": IGDB_CLIENT_ID,
            "Authorization": f"Bearer {self.twitch_auth.get_oauth_token()}",
            "Accept": "application/json",
        }

    @staticmethod
    def check_twitch_token(func):
        @functools.wraps(func)
        def wrapper(*args):
            args[0].headers[
                "Authorization"
            ] = f"Bearer {args[0].twitch_auth.get_oauth_token()}"
            return func(*args)

        return wrapper

    def _request(self, url: str, data: str, timeout: int = 120) -> list:
        try:
            res = requests.post(url, data, headers=self.headers, timeout=timeout)
            res.raise_for_status()
            return res.json()
        except HTTPError as err:
            # Retry once if the auth token is invalid
            if err.response.status_code != 401:
                log.error(err)
                return []  # All requests to the IGDB API return a list
            
            # Attempt to force a token refresh if the token is invalid
            log.warning("Twitch token invalid: fetching a new one...")
            token = self.twitch_auth._update_twitch_token()
            self.headers["Authorization"] = f"Bearer {token}"
        except Timeout:
            # Retry once the request if it times out
            pass

        try:
            res = requests.post(url, data, headers=self.headers, timeout=timeout)
            res.raise_for_status()
        except (HTTPError, Timeout) as err:
            # Log the error and return an empty list if the request fails again
            log.error(err)
            return []

        return res.json()

    def _search_rom(self, search_term: str, p_igdb_id: int, category: int = 0) -> dict:
        category_filter: str = f"& category={category}" if category else ""
        roms = self._request(
            self.games_url,
            data=f"""
                search "{search_term}";
                fields id, slug, name, summary, screenshots;
                where platforms=[{p_igdb_id}] {category_filter};
            """,
        )

        exact_matches = [
            rom
            for rom in roms
            if rom["name"].lower() == search_term.lower()
            or rom["slug"].lower() == search_term.lower()
        ]

        return pydash.get(exact_matches or roms, "[0]", {})

    @staticmethod
    def _normalize_cover_url(url: str) -> str:
        return f"https:{url.replace('https:', '')}"

    def _search_cover(self, rom_id: int) -> str:
        covers = self._request(
            self.covers_url,
            data=f"fields url; where game={rom_id};",
        )

        cover = pydash.get(covers, "[0]", None)
        return "" if not cover else self._normalize_cover_url(cover["url"])

    def _search_screenshots(self, rom_id: int) -> list:
        screenshots = self._request(
            self.screenshots_url,
            data=f"fields url; where game={rom_id}; limit {N_SCREENSHOTS};",
        )

        return [
            self._normalize_cover_url(r["url"]).replace("t_thumb", "t_original")
            for r in screenshots
            if "url" in r.keys()
        ]

    @check_twitch_token
    def get_platform(self, p_slug: str):
        paltforms = self._request(
            self.platform_url,
            data=f'fields id, name; where slug="{p_slug.lower()}";',
        )

        platform = pydash.get(paltforms, "[0]", None)
        if not platform:
            return {
                "igdb_id": "",
                "name": p_slug,
                "slug": p_slug,
            }

        return {
            "igdb_id": platform["id"],
            "name": platform["name"],
            "slug": p_slug,
        }

    @check_twitch_token
    async def get_rom(self, file_name: str, p_igdb_id: int):
        search_term = get_search_term(file_name)

        # Patch support for PS2 OPL flename format
        match = re.match(PS2_OPL_REGEX, search_term)
        if p_igdb_id == PS2_IGDB_ID and match:
            serial_code = match.group(1)

            with open(PS2_OPL_INDEX_FILE, "r") as index_json:
                opl_index = json.loads(index_json.read())
                index_entry = opl_index.get(serial_code, None)
                if index_entry:
                    search_term = index_entry["Name"]  # type: ignore

        # Patch support for switch titleID filename format
        match = re.match(SWITCH_TITLEDB_REGEX, search_term)
        if p_igdb_id == SWITCH_IGDB_ID and match:
            title_id = match.group(1)
            titledb_index = {}

            try:
                with open(SWITCH_TITLEDB_INDEX_FILE, "r") as index_json:
                    titledb_index = json.loads(index_json.read())
            except FileNotFoundError:
                log.warning("Fetching the Switch titleDB index file...")
                await update_switch_titledb_task.run(force=True)

                with open(SWITCH_TITLEDB_INDEX_FILE, "r") as index_json:
                    titledb_index = json.loads(index_json.read())
            finally:
                index_entry = titledb_index.get(title_id, None)
                if index_entry:
                    search_term = index_entry["name"]  # type: ignore

        if p_igdb_id == ARCADE_IGDB_ID:
            mame_index = {}

            try:
                with open(MAME_XML_FILE, "r") as index_xml:
                    mame_index = xmltodict.parse(index_xml.read())
            except FileNotFoundError:
                log.warning("Fetching the MAME XML file from HyperspinFE...")
                await update_mame_xml_task.run(force=True)

                with open(MAME_XML_FILE, "r") as index_xml:
                    mame_index = xmltodict.parse(index_xml.read())
            finally:
                index_entry = [
                    game
                    for game in mame_index["menu"]["game"]
                    if game["@name"] == search_term
                ]
                if index_entry:
                    search_term = index_entry[0].get("description", search_term)

        res = (
            self._search_rom(uc(search_term), p_igdb_id, MAIN_GAME_CATEGORY)
            or self._search_rom(uc(search_term), p_igdb_id, EXPANDED_GAME_CATEGORY)
            or self._search_rom(uc(search_term), p_igdb_id)
        )

        r_igdb_id = res.get("id", "")
        r_slug = res.get("slug", "")
        r_name = res.get("name", search_term)
        summary = res.get("summary", "")

        return {
            "r_igdb_id": r_igdb_id,
            "r_slug": r_slug,
            "r_name": r_name,
            "summary": summary,
            "url_cover": self._search_cover(r_igdb_id),
            "url_screenshots": self._search_screenshots(r_igdb_id),
        }

    @check_twitch_token
    def get_rom_by_id(self, r_igdb_id: int):
        roms = self._request(
            self.games_url,
            f"fields slug, name, summary; where id={r_igdb_id};",
        )
        rom = pydash.get(roms, "[0]", {})

        return {
            "r_igdb_id": r_igdb_id,
            "r_slug": rom.get("slug", ""),
            "r_name": rom.get("name", ""),
            "summary": rom.get("summary", ""),
            "url_cover": self._search_cover(r_igdb_id),
            "url_screenshots": self._search_screenshots(r_igdb_id),
        }

    @check_twitch_token
    def get_matched_roms_by_id(self, r_igdb_id: int):
        matched_rom = self.get_rom_by_id(r_igdb_id)
        matched_rom.update(
            url_cover=matched_rom["url_cover"].replace("t_thumb", "t_cover_big"),
        )
        return [matched_rom]

    @check_twitch_token
    def get_matched_roms_by_name(self, search_term: str, p_igdb_id: int):
        if not p_igdb_id:
            return []

        matched_roms = self._request(
            self.games_url,
            data=f"""
                search "{uc(search_term)}";
                fields id, slug, name, summary;
                where platforms=[{p_igdb_id}];
            """,
        )

        return [
            dict(
                rom,
                url_cover=self._search_cover(rom["id"]).replace(
                    "t_thumb", "t_cover_big"
                ),
                url_screenshots=self._search_screenshots(rom["id"]),
                r_igdb_id=rom.pop("id"),
                r_slug=rom.pop("slug"),
                r_name=rom.pop("name"),
            )
            for rom in matched_roms
        ]


class TwitchAuth:
    def _update_twitch_token(self) -> str:
        res = requests.post(
            url="https://id.twitch.tv/oauth2/token",
            params={
                "client_id": IGDB_CLIENT_ID,
                "client_secret": IGDB_CLIENT_SECRET,
                "grant_type": "client_credentials",
            },
            timeout=30,
        ).json()

        token = res.get("access_token", "")
        expires_in = res.get("expires_in", 0)
        if not token or expires_in == 0:
            log.error(
                "Could not get twitch auth token: check client_id and client_secret"
            )
            sys.exit(2)

        # Set token in redis to expire in <expires_in> seconds
        cache.set("romm:twitch_token", token, ex=expires_in - 10)  # type: ignore[attr-defined]
        cache.set("romm:twitch_token_expires_at", time.time() + expires_in - 10)  # type: ignore[attr-defined]

        log.info("Twitch token fetched!")

        return token

    def get_oauth_token(self) -> str:
        # Use a fake token when running tests
        if "pytest" in sys.modules:
            return "test_token"

        # Fetch the token cache
        token = cache.get("romm:twitch_token")  # type: ignore[attr-defined]
        token_expires_at = cache.get("romm:twitch_token_expires_at")  # type: ignore[attr-defined]

        if not token or time.time() > float(token_expires_at or 0):
            log.warning("Twitch token invalid: fetching a new one...")
            return self._update_twitch_token()

        return token