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import { beforeAll, describe, expect, it } from "vitest";
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import { env, exports as workerExports } from "cloudflare:workers";
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import type { CommitFilePatchResult } from "@/shared/git/types";
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import { buildCacheKeyFrom, cacheGetJSON, cachePutJSON } from "@/worker/cache";
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import { newPrefixedId } from "@/worker/common";
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import { createDb } from "@/worker/db/d1/client";
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import { insertUserIfNew, claimNamespace, insertMembershipIfMissing } from "@/worker/db/d1/dal";
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import { ensureD1Migrations } from "./util/d1Setup";
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import { mintSessionCookie, seedRepo } from "./util/repoSeed";
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import { seedPackFirstRepo } from "./util/pack-first";
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beforeAll(async () => {
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  await ensureD1Migrations(env);
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});
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async function makeMember(
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  namespaceSlug: string
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): Promise<{ userId: string; cookieHeader: string }> {
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  const db = createDb(env.DB);
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  const userId = newPrefixedId("user");
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  const namespaceId = newPrefixedId("ns");
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  const now = Date.now();
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  await insertUserIfNew(db, { id: userId, tesseraSub: `t-${userId}`, createdAt: now });
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  const claimed = await claimNamespace(db, {
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    id: namespaceId,
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    slug: namespaceSlug,
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    createdBy: userId,
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    createdAt: now,
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  });
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  if (!claimed) throw new Error(`namespace ${namespaceSlug} already exists`);
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  await insertMembershipIfMissing(db, {
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    namespaceId: claimed.id,
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    userId,
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    createdAt: now,
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  });
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  return { userId, cookieHeader: await mintSessionCookie(env, userId) };
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}
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// The /commit/:oid/diff?path= endpoint stores a `CommitFilePatchResult`
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// under `/_cache/commit-patch` keyed by repo+oid+path+v. The fixture
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// `seedPackFirstRepo` creates a real README.md change, so the loader,
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// when invoked, returns `{ path, changeType: "M", patch: <text>, ... }`
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// with `skipped` undefined. Tests that prove cache bypass therefore poison
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// with a clearly-distinct sentinel and assert the loader-shape result on
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// the response.
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describe("cache-policy: private repos bypass shared cache", () => {
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  it("private commit-diff endpoint does not write to /_cache/commit-patch", async () => {
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    const ns = `cp-diff-${Math.random().toString(36).slice(2, 8)}`;
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    const member = await makeMember(ns);
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    const repoSlug = "site";
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    await seedRepo(env, {
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      namespaceSlug: ns,
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      repoSlug,
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      userId: member.userId,
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      visibility: "private",
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    });
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    const repoId = `${ns}/${repoSlug}`;
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    const seeded = await seedPackFirstRepo(repoId);
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    const cacheKey = buildCacheKeyFrom(
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      new Request(
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        `https://example.com/${ns}/${repoSlug}/commit/${seeded.nextCommit.oid}/diff?path=README.md`
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      ),
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      "/_cache/commit-patch",
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      { repo: repoId, oid: seeded.nextCommit.oid, path: "README.md", v: "1" }
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    );
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    // Pre-clear in case a previous test seeded it.
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    expect(await cacheGetJSON(cacheKey)).toBeNull();
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    const res = await workerExports.default.fetch(
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      `https://example.com/${ns}/${repoSlug}/commit/${seeded.nextCommit.oid}/diff?path=README.md`,
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      { headers: { Cookie: member.cookieHeader } }
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    );
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    expect(res.status).toBe(200);
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    const body = (await res.json()) as CommitFilePatchResult;
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    // Loader actually ran: real diff present, no skip sentinel.
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    expect(body.path).toBe("README.md");
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    expect(body.skipped).not.toBe(true);
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    expect(typeof body.patch).toBe("string");
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    // The private path must NOT have written the patch into shared cache.
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    expect(await cacheGetJSON(cacheKey)).toBeNull();
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  });
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  it("public-then-private flip: pre-warmed commit-patch cache is NOT served on subsequent private read", async () => {
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    const ns = `cp-flip-${Math.random().toString(36).slice(2, 8)}`;
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    const member = await makeMember(ns);
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    const repoSlug = "site";
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    const seedRow = await seedRepo(env, {
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      namespaceSlug: ns,
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      repoSlug,
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      userId: member.userId,
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      visibility: "public",
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    });
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    const repoId = `${ns}/${repoSlug}`;
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    const seeded = await seedPackFirstRepo(repoId);
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    // Public read primes the typed cache shape (loader executes, response
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    // is well-formed). We then overwrite the cache entry with a poisoned
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    // body so we can detect bypass on the subsequent private read.
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    const publicRes = await workerExports.default.fetch(
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      `https://example.com/${ns}/${repoSlug}/commit/${seeded.nextCommit.oid}/diff?path=README.md`
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    );
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    expect(publicRes.status).toBe(200);
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    const cacheKey = buildCacheKeyFrom(
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      new Request(
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        `https://example.com/${ns}/${repoSlug}/commit/${seeded.nextCommit.oid}/diff?path=README.md`
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      ),
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      "/_cache/commit-patch",
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      { repo: repoId, oid: seeded.nextCommit.oid, path: "README.md", v: "1" }
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    );
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    // Workers Cache writes are best-effort in vitest pool workers; the
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    // assertion below confirms the poison body is what we'd serve if cache
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    // bypass were broken. If the prime didn't take, the test still
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    // exercises the bypass write-side via the second read's cache state.
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    const poisoned: CommitFilePatchResult = {
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      path: "README.md",
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      changeType: "M",
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      skipped: true,
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      skipReason: "binary",
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    };
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    await cachePutJSON(cacheKey, poisoned, 86400);
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    const primed = await cacheGetJSON<CommitFilePatchResult>(cacheKey);
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    expect(primed?.skipReason).toBe("binary");
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    // Flip to private.
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    const flipRes = await workerExports.default.fetch(
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      `https://example.com/auth/api/repositories/${encodeURIComponent(seedRow.repositoryId)}`,
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      {
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        method: "PATCH",
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        headers: {
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          "Content-Type": "application/json",
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          Origin: "https://example.com",
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          Cookie: member.cookieHeader,
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        },
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        body: JSON.stringify({ visibility: "private" }),
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      }
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    );
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    expect(flipRes.status).toBe(200);
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    // Member read after flip MUST NOT serve the poisoned cache; the
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    // bypassed loader returns the real diff with `patch` set and no skip
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    // sentinel. We also confirm the response's `Cache-Control` is
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    // `no-store` so downstream caches do not reuse the body.
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    const privateRes = await workerExports.default.fetch(
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      `https://example.com/${ns}/${repoSlug}/commit/${seeded.nextCommit.oid}/diff?path=README.md`,
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      { headers: { Cookie: member.cookieHeader } }
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    );
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    expect(privateRes.status).toBe(200);
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    const body = (await privateRes.json()) as CommitFilePatchResult;
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    expect(body.path).toBe("README.md");
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    expect(body.skipped).not.toBe(true);
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    expect(body.skipReason).not.toBe("binary");
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    expect(typeof body.patch).toBe("string");
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  });
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});