import {
  objectRef,
  type RuntimeContext,
} from "@quixos/camino-package-runtime";

export type PlacementInput = {
  canvas_id: string;
  subject_id: string;
  x: number;
  y: number;
  width: number;
  height: number;
  z: number;
};

const finiteNumber = (value: unknown, fallback: number) =>
  typeof value === "number" && Number.isFinite(value) ? value : fallback;

const objectId = (value: unknown, field: string) => {
  if (typeof value !== "string" || !value.startsWith("obj:")) {
    throw new Error(`${field} must be a Camino object ID`);
  }
  return value;
};

export const normalizePlacementInput = (
  input: Record<string, unknown>,
): PlacementInput => ({
  canvas_id: objectId(input.canvas_id, "canvas_id"),
  subject_id: objectId(input.subject_id, "subject_id"),
  x: finiteNumber(input.x, 0),
  y: finiteNumber(input.y, 0),
  width: Math.max(220, finiteNumber(input.width, 420)),
  height: Math.max(150, finiteNumber(input.height, 320)),
  z: Math.trunc(finiteNumber(input.z, 0)),
});

export const createCanvas = (context: RuntimeContext) =>
  objectRef(context.objectId);

export const createPlacement = async (context: RuntimeContext) => {
  const input = normalizePlacementInput(context.input);
  await Promise.all([
    context.state<number>("port:web-studio-placement-constructor:x").set(input.x),
    context.state<number>("port:web-studio-placement-constructor:y").set(input.y),
    context.state<number>("port:web-studio-placement-constructor:width").set(input.width),
    context.state<number>("port:web-studio-placement-constructor:height").set(input.height),
    context.state<number>("port:web-studio-placement-constructor:z").set(input.z),
  ]);
  await context.edge("port:web-studio-placement-constructor:subject").connect(input.subject_id);
  await context.edge("port:web-studio-placement-constructor:canvas").connect(input.canvas_id);
  return objectRef(context.objectId);
};