import type { CanvasState, CanvasWorkspaceType } from "@/types/canvas";

export type CanvasSaveRevisionOptions = {
  baseCanvasRevision?: string | null;
  baseCanvasUpdatedAt?: string | null;
};

function normalizeRevisionValue(value: unknown) {
  return String(value || "").trim() || undefined;
}

export function mergeCanvasSaveRevisionOptions(params: {
  options?: CanvasSaveRevisionOptions;
  fallbackOptions?: CanvasSaveRevisionOptions;
}): CanvasSaveRevisionOptions {
  return {
    baseCanvasRevision:
      normalizeRevisionValue(params.options?.baseCanvasRevision) ??
      normalizeRevisionValue(params.fallbackOptions?.baseCanvasRevision),
    baseCanvasUpdatedAt:
      normalizeRevisionValue(params.options?.baseCanvasUpdatedAt) ??
      normalizeRevisionValue(params.fallbackOptions?.baseCanvasUpdatedAt),
  };
}

export function buildCanvasSaveRequestBody(params: {
  canvasData: CanvasState;
  workspaceType?: CanvasWorkspaceType;
  options?: CanvasSaveRevisionOptions;
  fallbackOptions?: CanvasSaveRevisionOptions;
}) {
  const revisionOptions = mergeCanvasSaveRevisionOptions({
    options: params.options,
    fallbackOptions: params.fallbackOptions,
  });

  return params.workspaceType
    ? { canvasData: params.canvasData, workspaceType: params.workspaceType, ...revisionOptions }
    : { canvasData: params.canvasData, ...revisionOptions };
}