const fs = require("node:fs/promises");
const path = require("node:path");

const {
  WecomCallbackError,
  buildEncryptedApprovalEventSample,
  buildUrlVerificationSample,
  createWecomSignature,
  decryptWecomMessage,
  extractEncryptedFromXml,
  maskWecomIdentifier,
  normalizeApprovalCallbackEvent,
  readCallbackEvidence,
  recordCallbackEvidence,
  verifyWecomSignature,
} = require("../../../src/services/integrations/wecomCallbackCrypto");

const TOKEN = "callback-token";
const AES_KEY = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFG";
const CORP_ID = "ww-callback-corp";
const SENSITIVE_SP_NO = "SPFULLIDENTIFIERSHOULDNOTLEAK0001";
const SENSITIVE_TEMPLATE_ID = "TPLFULLIDENTIFIERSHOULDNOTLEAK0001";

describe("wecomCallbackCrypto", () => {
  it("creates and verifies WeCom callback signatures", () => {
    const signature = createWecomSignature({
      token: TOKEN,
      timestamp: "1770000000",
      nonce: "nonce",
      encrypted: "encrypted-payload",
    });

    expect(signature).toMatch(/^[0-9a-f]{40}$/);
    expect(verifyWecomSignature({
      token: TOKEN,
      timestamp: "1770000000",
      nonce: "nonce",
      encrypted: "encrypted-payload",
      signature,
    })).toBe(true);
    expect(verifyWecomSignature({
      token: TOKEN,
      timestamp: "1770000000",
      nonce: "nonce",
      encrypted: "other",
      signature,
    })).toBe(false);
  });

  it("decrypts URL verification echostr samples", () => {
    const sample = buildUrlVerificationSample({
      token: TOKEN,
      encodingAesKey: AES_KEY,
      receiveId: CORP_ID,
      timestamp: "1770000000",
      nonce: "nonce",
      plainText: "wcbk1-url-verify-ok",
    });

    const decrypted = decryptWecomMessage({
      encrypted: sample.encrypted,
      encodingAesKey: AES_KEY,
      receiveId: CORP_ID,
    });

    expect(sample.signature).toMatch(/^[0-9a-f]{40}$/);
    expect(decrypted.plainXml).toBe("wcbk1-url-verify-ok");
    expect(decrypted.receiveId).toBe(CORP_ID);
  });

  it("normalizes approval callback events without leaking raw identifiers", () => {
    const sample = buildEncryptedApprovalEventSample({
      token: TOKEN,
      encodingAesKey: AES_KEY,
      receiveId: CORP_ID,
      timestamp: "1770000000",
      nonce: "nonce",
      spNo: SENSITIVE_SP_NO,
      templateId: SENSITIVE_TEMPLATE_ID,
    });
    const encrypted = extractEncryptedFromXml(sample.encryptedXml);
    const decrypted = decryptWecomMessage({
      encrypted,
      encodingAesKey: AES_KEY,
      receiveId: CORP_ID,
    });
    const summary = normalizeApprovalCallbackEvent(decrypted.plainXml);

    expect(summary).toMatchObject({
      eventType: "open_approval_change",
      msgType: "event",
      callbackKind: "approval_status_change",
      approvalType: "leave",
      spStatus: "2",
      statusLabel: "已通过",
      spNoPrefix: maskWecomIdentifier(SENSITIVE_SP_NO),
      templateIdPrefix: maskWecomIdentifier(SENSITIVE_TEMPLATE_ID),
    });
    expect(JSON.stringify(summary)).not.toContain(SENSITIVE_SP_NO);
    expect(JSON.stringify(summary)).not.toContain(SENSITIVE_TEMPLATE_ID);
    expect(summary.idempotencyKey).toHaveLength(32);
  });

  it("rejects mismatched receiveId", () => {
    const sample = buildUrlVerificationSample({
      token: TOKEN,
      encodingAesKey: AES_KEY,
      receiveId: CORP_ID,
      timestamp: "1770000000",
      nonce: "nonce",
      plainText: "ok",
    });

    expect(() => decryptWecomMessage({
      encrypted: sample.encrypted,
      encodingAesKey: AES_KEY,
      receiveId: "other-corp",
    })).toThrow(WecomCallbackError);
  });

  it("records callback evidence idempotently and only stores redacted fields", async () => {
    const evidenceFile = path.join("/tmp", `wcbk1-evidence-${Date.now()}-${Math.random()}.jsonl`);
    const summary = {
      eventType: "open_approval_change",
      msgType: "event",
      callbackKind: "approval_status_change",
      approvalType: "leave",
      spStatus: "2",
      statusLabel: "已通过",
      spNoPrefix: maskWecomIdentifier(SENSITIVE_SP_NO),
      templateIdPrefix: maskWecomIdentifier(SENSITIVE_TEMPLATE_ID),
      createTime: "1770000000",
      applyTime: "1770000000",
      agentIdPrefix: "1000***",
      idempotencyKey: "idem-key",
    };

    const first = await recordCallbackEvidence(summary, { evidenceFile });
    const second = await recordCallbackEvidence(summary, { evidenceFile });
    const events = await readCallbackEvidence({ evidenceFile });
    const raw = await fs.readFile(evidenceFile, "utf8");

    expect(first.recorded).toBe(true);
    expect(second.duplicate).toBe(true);
    expect(events).toHaveLength(1);
    expect(raw).not.toContain(SENSITIVE_SP_NO);
    expect(raw).not.toContain(SENSITIVE_TEMPLATE_ID);
  });
});