import type { CanvasGenerateImageResult } from "./generate-image";
import { layoutReplaceQualityFailure, type LayoutReplaceQuality } from "./layout-replace-quality";

// A semantic rejection may generate one corrected candidate. Network/unknown
// generation failures and unavailable verification never replay a paid request.
export async function runValidatedLayoutReplacement(params: {
  generate: (attempt: number, feedback: string) => Promise<CanvasGenerateImageResult>;
  normalize: (result: CanvasGenerateImageResult) => Promise<CanvasGenerateImageResult>;
  verify: (result: CanvasGenerateImageResult) => Promise<LayoutReplaceQuality>;
  persist: (result: CanvasGenerateImageResult) => Promise<void>;
}) {
  let feedback = "";
  for (let attempt = 0; attempt < 2; attempt++) {
    const generated = await params.generate(attempt, feedback);
    if (!generated.images[0]?.originalUrl) throw new Error("排版替换未返回结果图片");
    const normalized = await params.normalize(generated);
    const check = await params.verify(normalized);
    if (check.passed) {
      const result = { ...normalized, validation: {
        kind: "layout-replace", status: "passed", attempts: attempt + 1, confidence: check.confidence,
      } };
      await params.persist(result);
      return result;
    }
    feedback = layoutReplaceQualityFailure(check);
    console.warn("[Canvas Layout Replace] candidate rejected", { attempt: attempt + 1, reasons: feedback });
  }
  throw new Error(`替换结果未通过质量检查，未作为合格结果返回：${feedback}`);
}