import logging
from typing import Annotated

from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel, Field

from api.auth import User, get_current_user
from database import engine
from models.listing import ListingType
from repositories.poi_repository import POIRepository
from repositories.user_repository import UserRepository
from services import poi_service, task_service

logger = logging.getLogger("uvicorn")

poi_router = APIRouter(prefix="/api/poi", tags=["poi"])


class CreatePOIRequest(BaseModel):
    name: str = Field(max_length=200)
    address: str = Field(max_length=500)
    latitude: float = Field(ge=-90, le=90)
    longitude: float = Field(ge=-180, le=180)


class UpdatePOIRequest(BaseModel):
    name: str | None = Field(default=None, max_length=200)
    address: str | None = Field(default=None, max_length=500)
    latitude: float | None = Field(default=None, ge=-90, le=90)
    longitude: float | None = Field(default=None, ge=-180, le=180)


class POIResponse(BaseModel):
    id: int
    name: str
    address: str
    latitude: float
    longitude: float
    created_at: str


class CalculateRequest(BaseModel):
    travel_modes: list[str]  # WALK, BICYCLE, TRANSIT
    listing_type: ListingType = ListingType.RENT
    listing_ids: list[int] | None = None


class POIDistanceResponse(BaseModel):
    poi_id: int
    poi_name: str
    travel_mode: str
    duration_seconds: int
    distance_meters: int


def _get_user_id(user: User) -> int:
    """Resolve auth User to database user ID."""
    user_repo = UserRepository(engine)
    db_user = user_repo.get_user_by_email(user.email)
    if db_user is None:
        # Auto-create user on first POI interaction
        db_user = user_repo.create_user(user.email)
    if db_user.id is None:
        raise HTTPException(status_code=500, detail="Failed to create user")
    return db_user.id


def _poi_to_response(poi: "poi_service.PointOfInterest") -> POIResponse:
    return POIResponse(
        id=poi.id,  # type: ignore[arg-type]
        name=poi.name,
        address=poi.address,
        latitude=poi.latitude,
        longitude=poi.longitude,
        created_at=poi.created_at.isoformat(),
    )


@poi_router.get("", response_model=list[POIResponse])
async def list_pois(
    user: Annotated[User, Depends(get_current_user)],
) -> list[POIResponse]:
    """List all POIs for the current user."""
    user_id = _get_user_id(user)
    repo = POIRepository(engine)
    pois = poi_service.get_user_pois(repo, user_id)
    return [_poi_to_response(p) for p in pois]


@poi_router.post("", response_model=POIResponse)
async def create_poi(
    user: Annotated[User, Depends(get_current_user)],
    body: CreatePOIRequest,
) -> POIResponse:
    """Create a new POI."""
    user_id = _get_user_id(user)
    repo = POIRepository(engine)
    result = poi_service.create_poi(
        repo,
        user_id=user_id,
        name=body.name,
        address=body.address,
        latitude=body.latitude,
        longitude=body.longitude,
    )
    return _poi_to_response(result.poi)


@poi_router.put("/{poi_id}", response_model=POIResponse)
async def update_poi(
    user: Annotated[User, Depends(get_current_user)],
    poi_id: int,
    body: UpdatePOIRequest,
) -> POIResponse:
    """Update an existing POI."""
    user_id = _get_user_id(user)
    repo = POIRepository(engine)
    result = poi_service.update_poi(
        repo,
        poi_id=poi_id,
        user_id=user_id,
        name=body.name,
        address=body.address,
        latitude=body.latitude,
        longitude=body.longitude,
    )
    if result is None:
        raise HTTPException(status_code=404, detail="POI not found")
    return _poi_to_response(result.poi)


@poi_router.delete("/{poi_id}")
async def delete_poi(
    user: Annotated[User, Depends(get_current_user)],
    poi_id: int,
) -> dict[str, bool]:
    """Delete a POI and its associated distances."""
    user_id = _get_user_id(user)
    repo = POIRepository(engine)
    deleted = poi_service.delete_poi(repo, poi_id, user_id)
    if not deleted:
        raise HTTPException(status_code=404, detail="POI not found")
    return {"success": True}


@poi_router.post("/{poi_id}/calculate")
async def calculate_distances(
    user: Annotated[User, Depends(get_current_user)],
    poi_id: int,
    body: CalculateRequest,
) -> dict[str, str]:
    """Trigger distance calculation for a POI."""
    user_id = _get_user_id(user)
    repo = POIRepository(engine)

    # Verify POI exists and belongs to user
    poi = poi_service.get_poi(repo, poi_id)
    if poi is None or poi.user_id != user_id:
        raise HTTPException(status_code=404, detail="POI not found")

    result = poi_service.trigger_calculation(
        poi_id=poi_id,
        travel_modes=body.travel_modes,
        listing_type=body.listing_type,
        user_email=user.email,
        listing_ids=body.listing_ids,
    )

    if result.task_id:
        task_service.add_task_for_user(user.email, result.task_id)

    return {"task_id": result.task_id or "", "message": result.message}


@poi_router.get("/distances")
async def get_distances(
    user: Annotated[User, Depends(get_current_user)],
    listing_id: int,
    listing_type: ListingType = ListingType.RENT,
) -> list[POIDistanceResponse]:
    """Get POI distances for a specific listing."""
    user_id = _get_user_id(user)
    repo = POIRepository(engine)
    poi_repo_pois = {
        p.id: p for p in poi_service.get_user_pois(repo, user_id)
    }

    distances = poi_service.get_distances_for_listing(
        repo, listing_id, listing_type, user_id
    )

    return [
        POIDistanceResponse(
            poi_id=d.poi_id,
            poi_name=poi_repo_pois[d.poi_id].name if d.poi_id in poi_repo_pois else "Unknown",
            travel_mode=d.travel_mode,
            duration_seconds=d.duration_seconds,
            distance_meters=d.distance_meters,
        )
        for d in distances
    ]