from __future__ import annotations

import asyncio
from contextlib import asynccontextmanager
from pathlib import Path

from fastapi import FastAPI, WebSocket, WebSocketDisconnect
from fastapi.responses import FileResponse
from pydantic import BaseModel


class CriticFeedbackRequest(BaseModel):
    feedback: str
    task_id: str | None = None
    session_id: str | None = None
    feedback_type: str | None = None
    severity: str | None = None
    correction: str | None = None
    remember: bool = True
    retry: bool = False
    assistant_answer: str | None = None
    correctness_override: float | None = None
    usefulness_override: float | None = None
    safety_override: float | None = None

from app.core.permission_resolution import PermissionResolutionRequest, SecretResolutionRequest, PasswordResolutionRequest, ReviewResolutionRequest
from app.core.contracts import UserTask
from app.runtime.runtime_controller import RuntimeController
from app.streaming.manager import StreamingManager


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Load models on startup."""
    print("Lifespan: Starting model loading...")
    try:
        print("Lifespan: Loading models...")
        runtime.load_models_at_startup()
        print("Lifespan: Models loaded")

        # Rebuild vector index if empty but memory store has data.
        if runtime._memory_interface:
            store_count = runtime._memory_interface.count()
            if store_count > 0:
                idx_count = runtime._memory_interface._vector_index.element_count
                if idx_count == 0:
                    print(f"Lifespan: Rebuilding vector index ({store_count} entries)...")
                    runtime._memory_interface.reindex()
                    print("Lifespan: Vector index rebuilt")
    except Exception as e:
        print(f"Lifespan: Failed to load models: {e}")
        import traceback
        traceback.print_exc()
    
    yield  # Server runs here
    
    print("Lifespan: Shutting down...")


app = FastAPI(title="ducklm", lifespan=lifespan)
runtime = RuntimeController(base_dir=Path(__file__).resolve().parents[2])
streaming = StreamingManager(runtime.event_bus)


@app.get("/")
def index() -> FileResponse:
    return FileResponse(Path(__file__).resolve().parent / "static" / "index.html")


@app.get("/health")
def health() -> dict[str, str]:
    return {"status": "ok"}


@app.get("/events")
def list_events(limit: int = 500) -> dict[str, object]:
    safe_limit = max(1, min(limit, 2000))
    return {
        "events": [
            event.model_dump(mode="json")
            for event in runtime.event_bus.list_recent(limit=safe_limit)
        ]
    }


@app.post("/chat")
def chat(task: UserTask) -> dict[str, object]:
    submit = getattr(runtime, "submit_task", None)
    if callable(submit):
        return submit(task)
    return runtime.handle_task(task)


@app.post("/permissions/resolve")
def resolve_permission(request: PermissionResolutionRequest) -> dict[str, object]:
    submit = getattr(runtime, "submit_permission_resolution", None)
    if callable(submit):
        return submit(task_id=request.task_id, decision=request.decision)
    return runtime.resolve_permission(task_id=request.task_id, decision=request.decision)


@app.post("/secrets/resolve")
def resolve_secret(request: SecretResolutionRequest) -> dict[str, object]:
    submit = getattr(runtime, "submit_secret_resolution", None)
    if callable(submit):
        return submit(task_id=request.task_id, secret=request.secret)
    return runtime.resolve_secret(task_id=request.task_id, secret=request.secret)


@app.post("/password/resolve")
def resolve_password(request: PasswordResolutionRequest) -> dict[str, object]:
    submit = getattr(runtime, "submit_password_resolution", None)
    if callable(submit):
        return submit(task_id=request.task_id, password=request.password)
    return runtime.resolve_password(task_id=request.task_id, password=request.password)


@app.post("/review/resolve")
def resolve_review(request: ReviewResolutionRequest) -> dict[str, object]:
    submit = getattr(runtime, "submit_review_resolution", None)
    if callable(submit):
        return submit(task_id=request.task_id, decision=request.decision, correction=request.correction)
    return runtime.resolve_review(task_id=request.task_id, decision=request.decision, correction=request.correction)


@app.post("/critic/feedback")
def critic_feedback(request: CriticFeedbackRequest) -> dict[str, object]:
    feedback = runtime.handle_critic_feedback(
        feedback=request.feedback,
        task_id=request.task_id,
        session_id=request.session_id,
        feedback_type=request.feedback_type,
        severity=request.severity,
        correction=request.correction,
        remember=request.remember,
        retry=request.retry,
        assistant_answer=request.assistant_answer,
        correctness_override=request.correctness_override,
        usefulness_override=request.usefulness_override,
        safety_override=request.safety_override,
    )
    return feedback


@app.websocket("/stream/{task_id}")
async def stream_task(websocket: WebSocket, task_id: str) -> None:
    await websocket.accept()
    replayed_events = streaming.replay_events(task_id)
    for event in replayed_events:
        await websocket.send_json(event.model_dump(mode="json"))
    if replayed_events and replayed_events[-1].type in {"task_completed", "task_failed"}:
        await websocket.close()
        return

    queue = streaming.subscribe(task_id)
    try:
        while True:
            try:
                event = await asyncio.wait_for(queue.get(), timeout=30)
            except asyncio.TimeoutError:
                await websocket.send_json({"type": "heartbeat", "task_id": task_id})
                continue
            await websocket.send_json(event.model_dump(mode="json"))
            if event.type in {"task_completed", "task_failed", "task_awaiting_permission", "task_awaiting_input", "task_awaiting_review"}:
                break
    except WebSocketDisconnect:
        pass
    finally:
        streaming.unsubscribe(task_id, queue)
        await websocket.close()