"""Repository (DAO) implementing IFlightDatabase operations."""

from __future__ import annotations

from datetime import datetime, timezone
from typing import Any

from sqlalchemy import delete, select, update
from sqlalchemy.ext.asyncio import AsyncSession

from gps_denied.db.models import (
    ChunkRow,
    FlightRow,
    FlightStateRow,
    FrameResultRow,
    GeofenceRow,
    HeadingRow,
    ImageRow,
    WaypointRow,
)


class FlightRepository:
    """Async repository wrapping all DB operations for flights."""

    def __init__(self, session: AsyncSession) -> None:
        self._s = session

    # ── Flight CRUD ───────────────────────────────────────────────────

    async def insert_flight(
        self,
        *,
        name: str,
        description: str,
        start_lat: float,
        start_lon: float,
        altitude: float,
        camera_params: dict,
        flight_id: str | None = None,
    ) -> FlightRow:
        row = FlightRow(
            name=name,
            description=description,
            start_lat=start_lat,
            start_lon=start_lon,
            altitude=altitude,
            camera_params=camera_params,
        )
        if flight_id:
            row.id = flight_id
        self._s.add(row)
        await self._s.flush()
        # Create initial flight state
        state = FlightStateRow(flight_id=row.id)
        self._s.add(state)
        await self._s.flush()
        return row

    async def get_flight(self, flight_id: str) -> FlightRow | None:
        return await self._s.get(FlightRow, flight_id)

    async def list_flights(
        self,
        *,
        status: str | None = None,
        limit: int = 50,
        offset: int = 0,
    ) -> list[FlightRow]:
        stmt = select(FlightRow).offset(offset).limit(limit).order_by(FlightRow.created_at.desc())
        if status:
            stmt = stmt.join(FlightStateRow).where(FlightStateRow.status == status)
        result = await self._s.execute(stmt)
        return list(result.scalars().all())

    async def update_flight(self, flight_id: str, **kwargs: Any) -> bool:
        kwargs["updated_at"] = datetime.now(tz=timezone.utc)
        stmt = update(FlightRow).where(FlightRow.id == flight_id).values(**kwargs)
        result = await self._s.execute(stmt)
        return result.rowcount > 0  # type: ignore[union-attr]

    async def delete_flight(self, flight_id: str) -> bool:
        stmt = delete(FlightRow).where(FlightRow.id == flight_id)
        result = await self._s.execute(stmt)
        return result.rowcount > 0  # type: ignore[union-attr]

    # ── Waypoints ─────────────────────────────────────────────────────

    async def insert_waypoint(
        self,
        flight_id: str,
        *,
        lat: float,
        lon: float,
        altitude: float | None = None,
        confidence: float = 0.0,
        refined: bool = False,
        waypoint_id: str | None = None,
    ) -> WaypointRow:
        row = WaypointRow(
            flight_id=flight_id,
            lat=lat,
            lon=lon,
            altitude=altitude,
            confidence=confidence,
            refined=refined,
        )
        if waypoint_id:
            row.id = waypoint_id
        self._s.add(row)
        await self._s.flush()
        return row

    async def get_waypoints(self, flight_id: str, *, limit: int | None = None) -> list[WaypointRow]:
        stmt = (
            select(WaypointRow)
            .where(WaypointRow.flight_id == flight_id)
            .order_by(WaypointRow.timestamp)
        )
        if limit:
            stmt = stmt.limit(limit)
        result = await self._s.execute(stmt)
        return list(result.scalars().all())

    async def update_waypoint(self, flight_id: str, waypoint_id: str, **kwargs: Any) -> bool:
        stmt = (
            update(WaypointRow)
            .where(WaypointRow.id == waypoint_id, WaypointRow.flight_id == flight_id)
            .values(**kwargs)
        )
        result = await self._s.execute(stmt)
        return result.rowcount > 0  # type: ignore[union-attr]

    # ── Flight State ──────────────────────────────────────────────────

    async def save_flight_state(self, flight_id: str, **kwargs: Any) -> bool:
        kwargs["updated_at"] = datetime.now(tz=timezone.utc)
        stmt = update(FlightStateRow).where(FlightStateRow.flight_id == flight_id).values(**kwargs)
        result = await self._s.execute(stmt)
        return result.rowcount > 0  # type: ignore[union-attr]

    async def load_flight_state(self, flight_id: str) -> FlightStateRow | None:
        return await self._s.get(FlightStateRow, flight_id)

    # ── Frame Results ─────────────────────────────────────────────────

    async def save_frame_result(
        self,
        flight_id: str,
        *,
        frame_id: int,
        gps_lat: float,
        gps_lon: float,
        altitude: float = 0.0,
        heading: float = 0.0,
        confidence: float = 0.0,
        refined: bool = False,
    ) -> FrameResultRow:
        row = FrameResultRow(
            flight_id=flight_id,
            frame_id=frame_id,
            gps_lat=gps_lat,
            gps_lon=gps_lon,
            altitude=altitude,
            heading=heading,
            confidence=confidence,
            refined=refined,
        )
        self._s.add(row)
        await self._s.flush()
        return row

    async def get_frame_results(self, flight_id: str) -> list[FrameResultRow]:
        stmt = (
            select(FrameResultRow)
            .where(FrameResultRow.flight_id == flight_id)
            .order_by(FrameResultRow.frame_id)
        )
        result = await self._s.execute(stmt)
        return list(result.scalars().all())

    # ── Heading History ───────────────────────────────────────────────

    async def save_heading(
        self, flight_id: str, *, frame_id: int, heading: float
    ) -> HeadingRow:
        row = HeadingRow(flight_id=flight_id, frame_id=frame_id, heading=heading)
        self._s.add(row)
        await self._s.flush()
        return row

    async def get_heading_history(
        self, flight_id: str, *, last_n: int | None = None
    ) -> list[HeadingRow]:
        stmt = (
            select(HeadingRow)
            .where(HeadingRow.flight_id == flight_id)
            .order_by(HeadingRow.timestamp.desc())
        )
        if last_n:
            stmt = stmt.limit(last_n)
        result = await self._s.execute(stmt)
        return list(result.scalars().all())

    async def get_latest_heading(self, flight_id: str) -> float | None:
        rows = await self.get_heading_history(flight_id, last_n=1)
        return rows[0].heading if rows else None

    # ── Images ────────────────────────────────────────────────────────

    async def save_image_metadata(
        self, flight_id: str, *, frame_id: int, file_path: str, metadata: dict | None = None
    ) -> ImageRow:
        row = ImageRow(
            flight_id=flight_id, frame_id=frame_id, file_path=file_path, metadata_json=metadata
        )
        self._s.add(row)
        await self._s.flush()
        return row

    async def get_image_path(self, flight_id: str, frame_id: int) -> str | None:
        stmt = select(ImageRow.file_path).where(
            ImageRow.flight_id == flight_id, ImageRow.frame_id == frame_id
        )
        result = await self._s.execute(stmt)
        return result.scalar_one_or_none()

    # ── Chunks ────────────────────────────────────────────────────────

    async def save_chunk(
        self,
        flight_id: str,
        *,
        chunk_id: str | None = None,
        start_frame_id: int,
        end_frame_id: int | None = None,
        frames: list[int] | None = None,
        is_active: bool = True,
        has_anchor: bool = False,
        anchor_frame_id: int | None = None,
        anchor_lat: float | None = None,
        anchor_lon: float | None = None,
        matching_status: str = "pending",
    ) -> ChunkRow:
        row = ChunkRow(
            flight_id=flight_id,
            start_frame_id=start_frame_id,
            end_frame_id=end_frame_id,
            frames=frames or [],
            is_active=is_active,
            has_anchor=has_anchor,
            anchor_frame_id=anchor_frame_id,
            anchor_lat=anchor_lat,
            anchor_lon=anchor_lon,
            matching_status=matching_status,
        )
        if chunk_id:
            row.chunk_id = chunk_id
        self._s.add(row)
        await self._s.flush()
        return row

    async def load_chunks(self, flight_id: str) -> list[ChunkRow]:
        stmt = select(ChunkRow).where(ChunkRow.flight_id == flight_id)
        result = await self._s.execute(stmt)
        return list(result.scalars().all())

    async def delete_chunk(self, flight_id: str, chunk_id: str) -> bool:
        stmt = delete(ChunkRow).where(
            ChunkRow.chunk_id == chunk_id, ChunkRow.flight_id == flight_id
        )
        result = await self._s.execute(stmt)
        return result.rowcount > 0  # type: ignore[union-attr]

    # ── Geofences ─────────────────────────────────────────────────────

    async def insert_geofence(
        self,
        flight_id: str,
        *,
        nw_lat: float,
        nw_lon: float,
        se_lat: float,
        se_lon: float,
    ) -> GeofenceRow:
        row = GeofenceRow(
            flight_id=flight_id,
            nw_lat=nw_lat,
            nw_lon=nw_lon,
            se_lat=se_lat,
            se_lon=se_lon,
        )
        self._s.add(row)
        await self._s.flush()
        return row