import json
import os
import random
import re
from functools import lru_cache
from pathlib import Path
from typing import Any

try:
    from fastapi import Request
    from fastapi.responses import HTMLResponse, JSONResponse
    from fastapi.staticfiles import StaticFiles
except Exception:  # pragma: no cover - app dependencies are installed on Spaces.
    Request = Any
    HTMLResponse = str
    JSONResponse = dict
    StaticFiles = None

try:
    from gradio import Server as GradioServer
except Exception:  # pragma: no cover - keeps helper functions importable locally.
    GradioServer = None

try:
    from fastapi import FastAPI
except Exception:  # pragma: no cover
    FastAPI = None


BASE_DIR = Path(__file__).resolve().parent
DATA_PATH = BASE_DIR / "data" / "taboo_cards_playable.json"
SECONDS_PER_ROUND = 30
MAX_CLUE_CHARS = 280
MAX_MODEL_GUESSES = 3
MODEL_ID = "onnx-community/tiny-aya-global-ONNX"


if GradioServer is not None:
    app = GradioServer()
elif FastAPI is not None:
    app = FastAPI(title="Clue Vibes")
else:  # pragma: no cover
    raise RuntimeError("Gradio or FastAPI is required to run Clue Vibes.")

if StaticFiles is not None:
    app.mount("/static", StaticFiles(directory=BASE_DIR / "static"), name="static")


def _api_endpoint(name: str):
    if hasattr(app, "api"):
        return app.api(name=name)

    def decorator(func):
        return func

    return decorator


def _plain_text(value: Any) -> str:
    return re.sub(r"\s+", " ", str(value or "").strip())


def _word_key(value: Any) -> str:
    return _plain_text(value).lower()


def _compact(value: str) -> str:
    return re.sub(r"[^a-z0-9]+", "", value.lower())


def _variants(word: str) -> set[str]:
    base = _word_key(word)
    if not base:
        return set()

    variants = {base}
    if re.fullmatch(r"[a-z]+", base):
        variants.add(f"{base}s")
        variants.add(f"{base}es")
        variants.add(f"{base}ed")
        variants.add(f"{base}ing")
        if base.endswith("e"):
            variants.add(f"{base[:-1]}ed")
            variants.add(f"{base[:-1]}ing")
        if base.endswith("y") and len(base) > 2:
            variants.add(f"{base[:-1]}ies")
        if len(base) > 2 and base[-1] not in "aeiouy":
            variants.add(f"{base}{base[-1]}ed")
            variants.add(f"{base}{base[-1]}ing")
    return variants


def _contains_forbidden(clue: str, forbidden: list[str]) -> dict[str, Any]:
    clue_key = clue.lower()
    clue_compact = _compact(clue)

    for word in forbidden:
        clean = _word_key(word)
        if not clean:
            continue

        for variant in _variants(clean):
            if re.search(rf"(?<![a-z0-9]){re.escape(variant)}(?![a-z0-9])", clue_key):
                return {"ok": False, "word": clean}

        compact_word = _compact(clean)
        if len(compact_word) >= 4 and compact_word in clue_compact:
            return {"ok": False, "word": clean}

    return {"ok": True, "word": ""}


def _is_playable_card(card: dict[str, Any]) -> bool:
    target = _word_key(card.get("target"))
    banned = card.get("banned")
    if not re.fullmatch(r"[a-z][a-z-]{2,23}", target):
        return False
    if not isinstance(banned, list) or len(banned) < 5:
        return False
    return all(re.fullmatch(r"[a-z][a-z-]{2,23}", _word_key(item)) for item in banned[:5])


@lru_cache(maxsize=1)
def _cards() -> list[dict[str, Any]]:
    if not DATA_PATH.exists():
        raise FileNotFoundError(f"Card dataset not found at {DATA_PATH}")

    with DATA_PATH.open("r", encoding="utf-8") as handle:
        data = json.load(handle)

    raw_cards = data.get("cards", [])
    cards = [
        {
            "target": _word_key(card.get("target")),
            "banned": [_word_key(item) for item in card.get("banned", [])[:5]],
        }
        for card in raw_cards
        if isinstance(card, dict) and _is_playable_card(card)
    ]
    if not cards:
        raise RuntimeError("No playable cards were found in the dataset.")
    return cards


def new_round() -> dict[str, Any]:
    cards = _cards()
    index = random.randrange(len(cards))
    card = cards[index]
    return {
        "ok": True,
        "card_id": index,
        "target": card["target"],
        "banned": card["banned"],
        "seconds": SECONDS_PER_ROUND,
        "max_chars": MAX_CLUE_CHARS,
        "max_guesses": MAX_MODEL_GUESSES,
        "deck_size": len(cards),
        "model_id": MODEL_ID,
    }


def validate_clue(target: str, banned: list[str], clue: str) -> dict[str, Any]:
    target = _word_key(target)
    banned = [_word_key(item) for item in banned]
    clue = _plain_text(clue)

    if not clue:
        return {"ok": False, "error": "Write a clue first.", "blocked_word": ""}
    if len(clue) > MAX_CLUE_CHARS:
        return {
            "ok": False,
            "error": f"Keep the clue under {MAX_CLUE_CHARS} characters.",
            "blocked_word": "",
        }

    blocked = _contains_forbidden(clue, [target, *banned])
    if not blocked["ok"]:
        return {
            "ok": False,
            "error": "That clue uses a secret or banned word.",
            "blocked_word": blocked["word"],
        }

    return {"ok": True, "error": "", "blocked_word": ""}


def score_guess(target: str, guess: str) -> dict[str, Any]:
    target = _word_key(target)
    guess_key = _word_key(guess)
    guess_tokens = set(re.findall(r"[a-z][a-z-]*", guess_key))
    target_variants = _variants(target)
    correct = guess_key in target_variants or bool(guess_tokens & target_variants)
    return {"ok": True, "correct": correct, "target": target, "guess": guess_key}


@_api_endpoint(name="new_round")
def gradio_new_round() -> dict[str, Any]:
    """Start a new Clue Vibes round."""
    return new_round()


@_api_endpoint(name="validate_clue")
def gradio_validate_clue(target: str, banned: list[str], clue: str) -> dict[str, Any]:
    """Validate that a clue does not include the target or banned words."""
    return validate_clue(target, banned, clue)


@_api_endpoint(name="score_guess")
def gradio_score_guess(target: str, guess: str) -> dict[str, Any]:
    """Score Tiny Aya's guessed word against the current target."""
    return score_guess(target, guess)


@app.post("/round")
async def round_route() -> JSONResponse:
    return JSONResponse(new_round())


@app.post("/validate")
async def validate_route(request: Request) -> JSONResponse:
    payload = await request.json()
    result = validate_clue(
        target=str(payload.get("target", "")),
        banned=payload.get("banned") or [],
        clue=str(payload.get("clue", "")),
    )
    return JSONResponse(result, status_code=200 if result.get("ok") else 422)


@app.post("/score_guess")
async def score_guess_route(request: Request) -> JSONResponse:
    payload = await request.json()
    return JSONResponse(score_guess(str(payload.get("target", "")), str(payload.get("guess", ""))))


@app.get("/", response_class=HTMLResponse)
async def homepage() -> str:
    return (BASE_DIR / "index.html").read_text(encoding="utf-8")


if __name__ == "__main__":
    port = int(os.environ.get("PORT", "7860"))
    if hasattr(app, "launch"):
        app.launch(server_name="0.0.0.0", server_port=port, show_error=True)
    else:
        import uvicorn

        uvicorn.run(app, host="0.0.0.0", port=port)