"""Adapter for camera stage."""

import time
from typing import Any

from engine.pipeline.core import DataType, PipelineContext, Stage


class CameraStage(Stage):
    """Adapter wrapping Camera as a Stage."""

    def __init__(self, camera, name: str = "vertical"):
        self._camera = camera
        self.name = name
        self.category = "camera"
        self.optional = True
        self._last_frame_time: float | None = None

    def save_state(self) -> dict[str, Any]:
        """Save camera state for restoration after pipeline rebuild.

        Returns:
            Dictionary containing camera state that can be restored
        """
        return {
            "x": self._camera.x,
            "y": self._camera.y,
            "mode": self._camera.mode.value
            if hasattr(self._camera.mode, "value")
            else self._camera.mode,
            "speed": self._camera.speed,
            "zoom": self._camera.zoom,
            "canvas_width": self._camera.canvas_width,
            "canvas_height": self._camera.canvas_height,
            "_x_float": getattr(self._camera, "_x_float", 0.0),
            "_y_float": getattr(self._camera, "_y_float", 0.0),
            "_time": getattr(self._camera, "_time", 0.0),
        }

    def restore_state(self, state: dict[str, Any]) -> None:
        """Restore camera state from saved state.

        Args:
            state: Dictionary containing camera state from save_state()
        """
        from engine.camera import CameraMode

        self._camera.x = state.get("x", 0)
        self._camera.y = state.get("y", 0)

        # Restore mode - handle both enum value and direct enum
        mode_value = state.get("mode", 0)
        if isinstance(mode_value, int):
            self._camera.mode = CameraMode(mode_value)
        else:
            self._camera.mode = mode_value

        self._camera.speed = state.get("speed", 1.0)
        self._camera.zoom = state.get("zoom", 1.0)
        self._camera.canvas_width = state.get("canvas_width", 200)
        self._camera.canvas_height = state.get("canvas_height", 200)

        # Restore internal state
        if hasattr(self._camera, "_x_float"):
            self._camera._x_float = state.get("_x_float", 0.0)
        if hasattr(self._camera, "_y_float"):
            self._camera._y_float = state.get("_y_float", 0.0)
        if hasattr(self._camera, "_time"):
            self._camera._time = state.get("_time", 0.0)

    @property
    def stage_type(self) -> str:
        return "camera"

    @property
    def capabilities(self) -> set[str]:
        return {"camera"}

    @property
    def dependencies(self) -> set[str]:
        return {"render.output"}

    @property
    def inlet_types(self) -> set:
        return {DataType.TEXT_BUFFER}

    @property
    def outlet_types(self) -> set:
        return {DataType.TEXT_BUFFER}

    def process(self, data: Any, ctx: PipelineContext) -> Any:
        """Apply camera transformation to items."""
        if data is None:
            return data

        current_time = time.perf_counter()
        dt = 0.0
        if self._last_frame_time is not None:
            dt = current_time - self._last_frame_time
            self._camera.update(dt)
        self._last_frame_time = current_time

        ctx.set_state("camera_y", self._camera.y)
        ctx.set_state("camera_x", self._camera.x)

        if hasattr(self._camera, "apply"):
            viewport_width = ctx.params.viewport_width if ctx.params else 80
            viewport_height = ctx.params.viewport_height if ctx.params else 24
            return self._camera.apply(data, viewport_width, viewport_height)
        return data