from __future__ import annotations

from typing import Any, Dict, List, Optional

from fastapi import FastAPI, Request

from fastapi.middleware.cors import CORSMiddleware

from fastapi.responses import HTMLResponse, JSONResponse

from context_parser import (
    detect_intent,
    extract_game_context_fields,
    intent_to_help_mode,
    split_unity_message,
)

from conversation_logic import ConversationEngine

from generator_engine import GeneratorEngine

from logging_store import LoggingStore

from models import ChatRequest, EventLogRequest, SessionFinalizeRequest, SessionStartRequest

from question_support_loader import question_support_bank

from retrieval_engine import RetrievalEngine

from ui_html import HOME_HTML

from utils import clamp01, get_user_text

from pathlib import Path
import subprocess
import sys

retriever = RetrievalEngine()
generator = GeneratorEngine()
engine = ConversationEngine(retriever=retriever, generator=generator)
store = LoggingStore()
question_support_bank.load()

app = FastAPI(title="GameAI")
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Lightweight in-memory chat session state cache.
CHAT_SESSION_STATE: Dict[str, Dict[str, Any]] = {}


def _as_dict(value: Any) -> Dict[str, Any]:
    return value if isinstance(value, dict) else {}


def _extract_session_id(req_data: Dict[str, Any], req: ChatRequest) -> Optional[str]:
    candidates = [
        req_data.get("session_id"),
        getattr(req, "session_id", None),
        req_data.get("conversation_id"),
        getattr(req, "conversation_id", None),
    ]
    for candidate in candidates:
        if isinstance(candidate, str) and candidate.strip():
            return candidate.strip()
    return None


def _extract_chat_history(req_data: Dict[str, Any], req: ChatRequest) -> List[Dict[str, Any]]:
    candidates = [
        req_data.get("chat_history"),
        req_data.get("history"),
        getattr(req, "chat_history", None),
        getattr(req, "history", None),
    ]
    for candidate in candidates:
        if isinstance(candidate, list):
            return [item for item in candidate if isinstance(item, dict)]
    return []


def _recover_session_state_from_history(chat_history: List[Dict[str, Any]]) -> Dict[str, Any]:
    for item in reversed(chat_history):
        if not isinstance(item, dict):
            continue
        direct_state = item.get("session_state")
        if isinstance(direct_state, dict) and direct_state:
            return dict(direct_state)
        meta = item.get("meta")
        if isinstance(meta, dict):
            meta_state = meta.get("session_state")
            if isinstance(meta_state, dict) and meta_state:
                return dict(meta_state)
    return {}


def _merge_session_state(
    cached_state: Dict[str, Any],
    incoming_state: Dict[str, Any],
    history_state: Dict[str, Any],
    parsed_question_text: str,
    parsed_hint_stage: int,
    parsed_help_mode: str,
    parsed_intent: str,
    parsed_topic: str,
    parsed_category: str,
    parsed_user_last_input_type: str,
    parsed_built_on_previous_turn: bool,
) -> Dict[str, Any]:
    state: Dict[str, Any] = {}
    if cached_state:
        state.update(cached_state)
    if history_state:
        state.update(history_state)
    if incoming_state:
        state.update(incoming_state)

    if parsed_question_text:
        state["question_text"] = parsed_question_text
    if parsed_hint_stage:
        state["hint_stage"] = parsed_hint_stage
    if parsed_user_last_input_type:
        state["user_last_input_type"] = parsed_user_last_input_type
    if parsed_built_on_previous_turn:
        state["built_on_previous_turn"] = parsed_built_on_previous_turn
    if parsed_help_mode:
        state["help_mode"] = parsed_help_mode
    if parsed_intent:
        state["intent"] = parsed_intent
    if parsed_topic:
        state["topic"] = parsed_topic
    if parsed_category:
        state["category"] = parsed_category
    return state


@app.get("/health")
def health() -> Dict[str, Any]:
    return {
        "ok": True,
        "app": "GameAI",
        "generator_available": generator.available(),
        "question_support_loaded": True,
    }


@app.get("/", response_class=HTMLResponse)
def home() -> str:
    return HOME_HTML


@app.post("/chat")
async def chat(request: Request) -> JSONResponse:
    try:
        try:
            raw_body: Any = await request.json()
        except Exception:
            try:
                raw_body = (await request.body()).decode("utf-8", errors="ignore")
            except Exception:
                raw_body = None

        req_data: Dict[str, Any] = raw_body if isinstance(raw_body, dict) else {}
        req = ChatRequest(**req_data) if isinstance(req_data, dict) else ChatRequest()

        full_text = get_user_text(req, raw_body)
        parsed = split_unity_message(full_text)

        hidden_context = parsed.get("hidden_context", "")
        actual_user_message = (parsed.get("user_text", "") or "").strip()
        parsed_question_text = (parsed.get("question_text", "") or "").strip()
        parsed_hint_stage = int(parsed.get("hint_stage", 0) or 0)
        parsed_help_mode = (parsed.get("help_mode", "") or "").strip()
        parsed_intent = (parsed.get("intent", "") or "").strip()
        parsed_topic = (parsed.get("topic", "") or "").strip()
        parsed_category = (parsed.get("category", "") or "").strip()
        parsed_user_last_input_type = (parsed.get("user_last_input_type", "") or "").strip()
        parsed_built_on_previous_turn = bool(parsed.get("built_on_previous_turn", False))

        game_fields = extract_game_context_fields(hidden_context)
        chat_history = _extract_chat_history(req_data, req)
        incoming_session_state = _as_dict(req_data.get("session_state", getattr(req, "session_state", None)))
        history_session_state = _recover_session_state_from_history(chat_history)

        session_id = _extract_session_id(req_data, req)
        cached_session_state = CHAT_SESSION_STATE.get(session_id, {}) if session_id else {}

        session_state = _merge_session_state(
            cached_state=_as_dict(cached_session_state),
            incoming_state=incoming_session_state,
            history_state=history_session_state,
            parsed_question_text=parsed_question_text,
            parsed_hint_stage=parsed_hint_stage,
            parsed_help_mode=parsed_help_mode,
            parsed_intent=parsed_intent,
            parsed_topic=parsed_topic,
            parsed_category=parsed_category,
            parsed_user_last_input_type=parsed_user_last_input_type,
            parsed_built_on_previous_turn=parsed_built_on_previous_turn,
        )

        question_text = (
            (getattr(req, "question_text", None) or "").strip()
            or parsed_question_text
            or game_fields.get("question", "")
            or str(session_state.get("question_text", "") or "").strip()
        )
        options_text = getattr(req, "options_text", None) or game_fields.get("options", [])
        question_id = req_data.get("question_id") or getattr(req, "question_id", None) or session_state.get("question_id")

        category = (
            req_data.get("category")
            or getattr(req, "category", None)
            or parsed_category
            or game_fields.get("category")
            or session_state.get("category")
        )

        tone = clamp01(req_data.get("tone", getattr(req, "tone", 0.5)), 0.5)
        verbosity = clamp01(req_data.get("verbosity", getattr(req, "verbosity", 0.5)), 0.5)
        transparency = clamp01(req_data.get("transparency", getattr(req, "transparency", 0.5)), 0.5)

        incoming_help_mode = req_data.get("help_mode") or getattr(req, "help_mode", None) or parsed_help_mode or None
        explicit_intent = req_data.get("intent") or getattr(req, "intent", None) or parsed_intent or None

        resolved_user_text = req_data.get("raw_user_text") or actual_user_message or full_text or ""
        resolved_user_text = str(resolved_user_text).strip()

        intent = explicit_intent or detect_intent(resolved_user_text, incoming_help_mode)
        help_mode = incoming_help_mode or intent_to_help_mode(intent)

        result = engine.generate_response(
            raw_user_text=resolved_user_text,
            tone=tone,
            verbosity=verbosity,
            transparency=transparency,
            intent=intent,
            help_mode=help_mode,
            chat_history=chat_history,
            question_text=question_text,
            options_text=options_text,
            question_id=question_id,
            session_state=session_state,
            category=category,
        )

        meta: Dict[str, Any] = {
            "domain": result.domain,
            "solved": result.solved,
            "help_mode": result.help_mode,
            "answer_letter": result.answer_letter,
            "answer_value": result.answer_value,
            "topic": result.topic,
            "used_retrieval": result.used_retrieval,
            "used_generator": result.used_generator,
        }
        if isinstance(result.meta, dict):
            meta.update(result.meta)

        returned_session_state = _as_dict(meta.get("session_state"))
        if session_id and returned_session_state:
            CHAT_SESSION_STATE[session_id] = dict(returned_session_state)

        return JSONResponse({"reply": result.reply, "meta": meta})
    except Exception as e:
        return JSONResponse({"error": type(e).__name__, "detail": str(e)}, status_code=500)


@app.post("/log/session/start")
def log_session_start(payload: SessionStartRequest) -> Dict[str, Any]:
    return store.start_session(payload.session_id, payload.user_id, payload.condition, payload.metadata)


@app.post("/log/event")
def log_event(payload: EventLogRequest) -> Dict[str, Any]:
    return store.log_event(payload.session_id, payload.event_type, payload.payload, payload.timestamp)


@app.post("/log/session/finalize")
def log_session_finalize(payload: SessionFinalizeRequest) -> Dict[str, Any]:
    return store.finalize_session(payload.session_id, payload.summary)


@app.get("/research/sessions")
def research_sessions() -> Dict[str, Any]:
    return {"sessions": store.list_sessions()}


@app.get("/research/session/{session_id}")
def research_session(session_id: str) -> Dict[str, Any]:
    return store.get_session(session_id)