import type { VideoEditRequest } from "./video-edit-contract";

export function buildAliyunVideoEditRequest(input: VideoEditRequest, maskUrl?: string) {
  const parameters: Record<string, unknown> = { prompt_extend: false, watermark: false };
  let modelInput: Record<string, unknown>;
  if (input.operation === "intro") {
    modelInput = { function: "video_extension", prompt: input.prompt || "生成与尾段自然衔接的创意片头", last_clip_url: input.sourceUrl };
  } else if (input.operation === "repaint") {
    modelInput = { prompt: input.prompt || "保持原视频主体身份、动作与场景，提升镜头质感和光影，其他保持不变", media: [{ type: "video", url: input.sourceUrl }] };
    parameters.resolution = "720P";
    return { model: "wan2.7-videoedit", input: modelInput, parameters };
  } else {
    if (!maskUrl) throw new Error("区域编辑需要掩码图像");
    modelInput = {
      function: "video_edit",
      prompt: input.prompt || (input.operation === "subtitle" ? "移除画面底部字幕和文字，按周围画面自然修复背景" : "移除框选主体，按周围画面自然修复背景"),
      video_url: input.sourceUrl,
      mask_image_url: maskUrl,
      mask_frame_id: 1,
    };
    parameters.mask_type = input.operation === "erase" ? "tracking" : "fixed";
  }
  return { model: "wanx2.1-vace-plus", input: modelInput, parameters };
}