import assert from "node:assert/strict";
import test from "node:test";
import {
  getWecomOAuthSecret,
  resolveWecomClaimant,
  signWecomIdentityTicket,
  verifyWecomIdentityTicket,
  wecomClaimantPartnerId,
  WECOM_IDENTITY_TTL_MS,
} from "../lib/wecom-oauth-service.ts";

const SECRET = "internal-token-test";

function fakePartnerDb(partners = []) {
  return {
    prepare(sql) {
      return {
        bind(...params) {
          return {
            async first() {
              if (/WHERE wecom_external_user_id = \?/.test(sql)) {
                const row = partners.find(
                  (item) => item.wecom_external_user_id === params[0],
                );
                return row ? { id: row.id } : null;
              }
              return null;
            },
          };
        },
      };
    },
  };
}

test("identity ticket sign → verify roundtrip", async () => {
  const { ticket } = await signWecomIdentityTicket("wmExt123", "张三", {
    secret: SECRET,
  });
  const identity = await verifyWecomIdentityTicket(ticket, { secret: SECRET });
  assert.deepEqual(identity, { externalUserId: "wmExt123", displayName: "张三" });
});

test("identity ticket falls back to default display name when empty", async () => {
  const { ticket } = await signWecomIdentityTicket("wmExt123", "  ", {
    secret: SECRET,
  });
  const identity = await verifyWecomIdentityTicket(ticket, { secret: SECRET });
  assert.equal(identity.displayName, "企微客户");
});

test("identity ticket default TTL is 30 minutes and expiresIn matches", async () => {
  const now = Date.now();
  const { ticket, expiresIn } = await signWecomIdentityTicket("wmExt123", "张三", {
    secret: SECRET,
    nowMs: now,
  });
  assert.equal(expiresIn, 30 * 60);
  const identity = await verifyWecomIdentityTicket(ticket, {
    secret: SECRET,
    nowMs: now + WECOM_IDENTITY_TTL_MS - 1,
  });
  assert.ok(identity, "still valid just before expiry");
  const expired = await verifyWecomIdentityTicket(ticket, {
    secret: SECRET,
    nowMs: now + WECOM_IDENTITY_TTL_MS + 61_000,
  });
  assert.equal(expired, null, "expired beyond grace window");
});

test("identity ticket passes within 60s grace window", async () => {
  const now = Date.now();
  const { ticket } = await signWecomIdentityTicket("wmExt123", "张三", {
    secret: SECRET,
    nowMs: now,
  });
  const identity = await verifyWecomIdentityTicket(ticket, {
    secret: SECRET,
    nowMs: now + WECOM_IDENTITY_TTL_MS + 30_000,
  });
  assert.deepEqual(identity?.externalUserId, "wmExt123");
});

test("identity ticket verification fails on wrong secret", async () => {
  const { ticket } = await signWecomIdentityTicket("wmExt123", "张三", {
    secret: SECRET,
  });
  assert.equal(
    await verifyWecomIdentityTicket(ticket, { secret: "other-secret" }),
    null,
  );
});

test("identity ticket verification fails on tampered payload", async () => {
  const { ticket } = await signWecomIdentityTicket("wmExt123", "张三", {
    secret: SECRET,
  });
  const [payload, signature] = ticket.split(".");
  const decoded = JSON.parse(
    Buffer.from(payload.replace(/-/g, "+").replace(/_/g, "/"), "base64").toString(
      "utf8",
    ),
  );
  decoded.ext = "wmVictim";
  const forgedPayload = Buffer.from(JSON.stringify(decoded))
    .toString("base64")
    .replace(/\+/g, "-")
    .replace(/\//g, "_")
    .replace(/=+$/, "");
  assert.equal(
    await verifyWecomIdentityTicket(`${forgedPayload}.${signature}`, {
      secret: SECRET,
    }),
    null,
  );
});

test("identity ticket verification fails on malformed input", async () => {
  for (const bad of ["", "no-dot", ".abc", "abc.", "a b.c d", "xxx.yyy"]) {
    assert.equal(
      await verifyWecomIdentityTicket(bad, { secret: SECRET }),
      null,
      `rejects ${JSON.stringify(bad)}`,
    );
  }
});

test("getWecomOAuthSecret throws when ADMIN_INTERNAL_TOKEN missing", () => {
  const previous = process.env.ADMIN_INTERNAL_TOKEN;
  delete process.env.ADMIN_INTERNAL_TOKEN;
  try {
    assert.throws(() => getWecomOAuthSecret(), /ADMIN_INTERNAL_TOKEN/);
  } finally {
    if (previous !== undefined) process.env.ADMIN_INTERNAL_TOKEN = previous;
  }
});

test("wecomClaimantPartnerId derives stable partner-ext id", () => {
  const first = wecomClaimantPartnerId("wmExt123");
  assert.match(first, /^partner-ext-[a-z0-9]+$/);
  assert.equal(first, wecomClaimantPartnerId("wmExt123"));
  assert.notEqual(first, wecomClaimantPartnerId("wmExt456"));
});

test("resolveWecomClaimant reuses partner bound by operator", async () => {
  const db = fakePartnerDb([
    { id: "partner-9", wecom_external_user_id: "wmExt123" },
  ]);
  const resolved = await resolveWecomClaimant(db, "wmExt123");
  assert.deepEqual(resolved, { partnerId: "partner-9", matchedExisting: true });
});

test("resolveWecomClaimant derives new id when unbound", async () => {
  const db = fakePartnerDb();
  const resolved = await resolveWecomClaimant(db, "wmExt123");
  assert.equal(resolved.matchedExisting, false);
  assert.equal(resolved.partnerId, wecomClaimantPartnerId("wmExt123"));
});