import { describe, expect, it } from "vitest";

import {
  comparePdfSnapshotsBasic,
  createPdfDocumentSnapshot,
  type PdfDocumentSnapshot,
} from "../src/index.js";
import { createMinimalPdf } from "./pdf-fixture.js";

async function snapshot(
  label: string,
  text = "Visual diff fixture",
  width = 595,
  height = 842,
): Promise<PdfDocumentSnapshot> {
  return createPdfDocumentSnapshot(createMinimalPdf(text, width, height), {
    source: { kind: "custom", label },
    includeRaster: false,
  });
}

describe("PDF 基础视觉门禁", () => {
  it("通过纸张和正文一致的文档", async () => {
    const baseline = await snapshot("baseline");
    const candidate = await snapshot("candidate");
    const result = comparePdfSnapshotsBasic(baseline, candidate);
    expect(result.status).toBe("passed");
    expect(result.contentSimilarity).toBe(1);
    expect(result.issues).toEqual([]);
  });

  it("拒绝纸张尺寸和正文内容偏差", async () => {
    const baseline = await snapshot("baseline");
    const candidate = await snapshot("candidate", "Different content", 612);
    const result = comparePdfSnapshotsBasic(baseline, candidate);
    expect(result.status).toBe("failed");
    expect(result.issues.map((issue) => issue.code)).toEqual(
      expect.arrayContaining(["PAGE_SIZE_MISMATCH", "CONTENT_MISMATCH"]),
    );
  });

  it("内容完整性比较不受重新换行影响", async () => {
    const baseline = await snapshot("baseline", "same content");
    const candidate = await snapshot("candidate", "samecontent");
    const result = comparePdfSnapshotsBasic(baseline, candidate);
    expect(result.contentSimilarity).toBe(1);
    expect(result.status).toBe("passed");
  });

  it("页数不一致时仍保留溢出页配对记录", async () => {
    const baseline = await snapshot("baseline");
    const candidatePage = (await snapshot("candidate")).pages[0];
    if (!candidatePage) {
      throw new Error("测试快照缺少页面");
    }
    const candidate: PdfDocumentSnapshot = {
      ...(await snapshot("candidate")),
      pageCount: 2,
      pages: [
        candidatePage,
        {
          ...candidatePage,
          pageNumber: 2,
          contentText: "",
          items: [],
          lines: [],
        },
      ],
    };
    const result = comparePdfSnapshotsBasic(baseline, candidate);
    expect(result.pagePairs[1]).toEqual({
      candidatePageNumber: 2,
      status: "candidate-only",
    });
    expect(result.issues.map((issue) => issue.code)).toContain(
      "UNPAIRED_CANDIDATE_PAGE",
    );
  });
});