"""
SteamGridDB artwork fetching service.

Fetches top-voted artwork for a game from steamgriddb.com using the
official API. Used as a fallback when a modlist has no SteamIcons/ directory.

PRIVATE: This file contains an obfuscated API key. Do NOT sync to public-src.
"""

import base64
import logging
import urllib.request
import urllib.error
import json
from pathlib import Path
from typing import Optional

logger = logging.getLogger(__name__)

_BASE_URL = "https://www.steamgriddb.com/api/v2"

# Obfuscated Jackify service key - XOR with mask, base64-encoded.
# Keep this file out of public-src.
_OBF = b"LgRUXwtXTwUEAw02cnR7EHgEVFldXklTUlFQNiQmJBM="
_MSK = b"Jackify2024SGDB!Jackify2024SGDB!"


def _get_api_key() -> str:
    raw = base64.b64decode(_OBF)
    return bytes(a ^ b for a, b in zip(raw, _MSK)).decode()

# Steam App IDs for each Jackify game type key
GAME_STEAM_APP_IDS = {
    "skyrim":              "489830",
    "skyrimvr":            "611670",
    "fo4":                 "377160",
    "fallout4vr":          "611660",
    "fnv":                 "22380",
    "fo3":                 "22300",
    "oblivion":            "22330",
    "oblivion_remastered": "2623190",
    "enderal":             "976620",
    "starfield":           "1716740",
    "cp2077":              "1091500",
    "bg3":                 "1086940",
}

# Artwork slots: (endpoint_path, query_string, dest_filename)
_ARTWORK_SLOTS = [
    ("grids",  "dimensions=600x900&types=static&nsfw=false",  "grid-tall.png"),
    ("grids",  "dimensions=920x430&types=static&nsfw=false",  "grid-wide.png"),
    ("heroes", "dimensions=1920x620&types=static&nsfw=false", "grid-hero.png"),
    ("logos",  "types=static&nsfw=false",                     "grid-logo.png"),
]


def _api_get(endpoint: str, api_key: str) -> Optional[dict]:
    url = f"{_BASE_URL}/{endpoint}"
    req = urllib.request.Request(url, headers={
        "Authorization": f"Bearer {api_key}",
        "User-Agent": "Jackify/0.6",
    })
    try:
        with urllib.request.urlopen(req, timeout=10) as resp:
            return json.loads(resp.read().decode())
    except urllib.error.HTTPError as e:
        logger.warning(f"SteamGridDB API error {e.code} for {url}")
    except Exception as e:
        logger.warning(f"SteamGridDB request failed for {url}: {e}")
    return None


def _download(url: str, dest: Path) -> bool:
    try:
        req = urllib.request.Request(url, headers={"User-Agent": "Jackify/0.6"})
        with urllib.request.urlopen(req, timeout=15) as resp:
            dest.write_bytes(resp.read())
        return True
    except Exception as e:
        logger.warning(f"Failed to download {url}: {e}")
        return False


def detect_game_type_from_modlist(modlist_dir: str) -> Optional[str]:
    """Read gameName= from ModOrganizer.ini and return the Jackify game type key.

    Covers all supported game types. Returns None if the ini cannot be read or
    the game is not in GAME_STEAM_APP_IDS.
    """
    if not modlist_dir:
        return None
    try:
        from pathlib import Path as _Path
        mo2_ini = _Path(modlist_dir) / "ModOrganizer.ini"
        if not mo2_ini.exists():
            mo2_ini = _Path(modlist_dir) / "files" / "ModOrganizer.ini"
        if not mo2_ini.exists():
            return None
        content = mo2_ini.read_text(errors='ignore').lower()
        game_name_value = ""
        for _line in content.splitlines():
            stripped = _line.strip()
            if "=" not in stripped:
                continue
            key, value = stripped.split("=", 1)
            if key.strip().lower() == "gamename":
                game_name_value = value.strip()
                break
        gn = game_name_value.strip()
        if gn:
            if 'skyrim vr' in gn or 'skyrimvr' in gn:
                return "skyrimvr"
            if 'fallout 4 vr' in gn or 'fallout4vr' in gn:
                return "fallout4vr"
            if 'skyrim special edition' in gn:
                return "skyrim"
            if 'fallout new vegas' in gn or 'falloutnv' in gn or 'new vegas' in gn or gn == 'ttw':
                return "fnv"
            if 'fallout3' in gn or ('fallout 3' in gn and 'fallout 4' not in gn):
                return "fo3"
            if 'fallout 4' in gn:
                return "fo4"
            if 'starfield' in gn:
                return "starfield"
            if 'oblivion remastered' in gn:
                return "oblivion_remastered"
            if 'oblivion' in gn:
                return "oblivion"
            if 'enderal' in gn:
                return "enderal"
            if 'cyberpunk' in gn or 'cp2077' in gn:
                return "cp2077"
            if "baldur" in gn or 'bg3' in gn:
                return "bg3"
        else:
            # gameName= absent - fall back to content scan for common markers
            if 'skyrim special edition' in content or 'skse64_loader' in content:
                return "skyrim"
            if 'nvse_loader' in content or 'falloutnv' in content:
                return "fnv"
            if 'fose_loader' in content:
                return "fo3"
            if 'f4se_loader' in content:
                return "fo4"
            if 'baldur' in content or 'bg3' in content:
                return "bg3"
            if 'cyberpunk' in content or 'cp2077' in content:
                return "cp2077"
            if 'starfield' in content:
                return "starfield"
    except Exception as e:
        logger.debug(f"detect_game_type_from_modlist failed for {modlist_dir}: {e}")
    return None


def fetch_artwork(game_type: str, dest_dir: Path) -> int:
    """
    Fetch top-voted artwork for game_type from SteamGridDB into dest_dir.

    Returns the number of images successfully downloaded.
    dest_dir must already exist.
    """
    steam_appid = GAME_STEAM_APP_IDS.get(game_type)
    if not steam_appid:
        logger.debug(f"No Steam App ID mapping for game type: {game_type}")
        return 0

    api_key = _get_api_key()
    downloaded = 0
    for endpoint, query, filename in _ARTWORK_SLOTS:
        data = _api_get(f"{endpoint}/steam/{steam_appid}?{query}", api_key)
        if not data or not data.get("success") or not data.get("data"):
            logger.debug(f"No {endpoint} results for {game_type} ({steam_appid})")
            continue
        image_url = data["data"][0]["url"]
        dest_path = dest_dir / filename
        if _download(image_url, dest_path):
            logger.info(f"Downloaded {filename} for {game_type} from SteamGridDB")
            downloaded += 1

    return downloaded