export const CANVAS_LOCAL_EDIT_CONFIG_KEY = "canvas_local_edit_config";

export type CanvasLocalEditConfig = {
  modelId: string;
  scaleAdjustModelId: string;
};

export type CanvasLocalEditModelIdentity = {
  id: string;
  modelId: string;
};

export function defaultCanvasLocalEditConfig(): CanvasLocalEditConfig {
  return {
    modelId: "",
    scaleAdjustModelId: "",
  };
}

function normalizeModelRef(value: unknown) {
  return String(value || "").trim().slice(0, 128);
}

export function resolveCanvasLocalEditModelRef<
  T extends CanvasLocalEditModelIdentity,
>(models: T[], value: unknown): T | null {
  const modelRef = normalizeModelRef(value);
  if (!modelRef) return null;

  // New settings persist the database UUID so identically named runtime
  // models from different providers cannot be confused. Keep modelId lookup
  // as a compatibility path for settings saved before UUID persistence.
  return (
    models.find((model) => model.id === modelRef) ||
    models.find((model) => model.modelId === modelRef) ||
    null
  );
}

export function normalizeCanvasLocalEditConfig(
  value: unknown
): CanvasLocalEditConfig {
  const defaults = defaultCanvasLocalEditConfig();
  if (!value || typeof value !== "object" || Array.isArray(value)) {
    return defaults;
  }

  const raw = value as Record<string, unknown>;
  return {
    modelId: normalizeModelRef(raw.modelId),
    scaleAdjustModelId: normalizeModelRef(raw.scaleAdjustModelId),
  };
}