"""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

    @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