import type { VideoCanvasNodeCreationConfig } from "@/lib/video-canvas/node-creation";

export const VIDEO_CANVAS_RESOURCE_UPLOAD_PURPOSE =
  "video-canvas-add-resource";
export const VIDEO_CANVAS_RESOURCE_UPLOAD_SOURCE_TYPE =
  "video_canvas_upload";

export type VideoCanvasUploadedResourceMediaType =
  | "audio"
  | "image"
  | "video";

export type VideoCanvasUploadedResourceValidation =
  | { mediaType: VideoCanvasUploadedResourceMediaType; valid: true }
  | { error: string; valid: false };

export function getVideoCanvasUploadedResourceMediaType(
  contentType: string,
): VideoCanvasUploadedResourceMediaType | null {
  const normalized = contentType.trim().toLowerCase();
  if (normalized.startsWith("image/")) return "image";
  if (normalized.startsWith("video/")) return "video";
  if (normalized.startsWith("audio/")) return "audio";
  return null;
}

export function validateVideoCanvasUploadedResource(
  file: { size: number; type: string },
  config: VideoCanvasNodeCreationConfig["upload"],
): VideoCanvasUploadedResourceValidation {
  const mediaType = getVideoCanvasUploadedResourceMediaType(file.type);
  if (!mediaType) {
    return { error: "仅支持图片、视频或音频文件", valid: false };
  }
  if (file.size > config.maxFileSizeMb * 1024 * 1024) {
    return {
      error: `单个文件不能超过 ${config.maxFileSizeMb}MB`,
      valid: false,
    };
  }
  return { mediaType, valid: true };
}

export function getVideoCanvasUploadedResourceUrl(payload: unknown) {
  if (!payload || typeof payload !== "object" || Array.isArray(payload)) {
    return "";
  }
  const record = payload as Record<string, unknown>;
  return String(record.url || record.originalUrl || "").trim();
}