import { describe, expect, test } from "bun:test";
import {
  BUILD_RECORD_API_VERSION,
  BuildStoreConflictError,
  MemoryBuildStore,
  type BuildRecord,
} from "../../server/build-store";
import {
  BUILD_PROTOCOL_VERSION,
  type BuildRequest,
  type Sha256Digest,
} from "../../shared/build-protocol";

const workspace = `sha256:${"a".repeat(64)}` as Sha256Digest;

function build(
  id: string,
  imageKey = "project\0service\0image",
  createdAt = "2026-09-02T00:00:00.000Z",
): BuildRecord {
  const request: BuildRequest = {
    version: BUILD_PROTOCOL_VERSION,
    id,
    project: "project",
    service: "service",
    spec: {
      architecture: "amd64",
      image: "registry.test/app:latest",
      context: ".",
      buildArgs: [],
      workspace,
    },
  };
  const status = {
    version: BUILD_PROTOCOL_VERSION,
    id,
    state: "queued" as const,
    createdAt,
  };
  return {
    apiVersion: BUILD_RECORD_API_VERSION,
    kind: "BuildRecord",
    metadata: {
      name: id,
      resourceVersion: "1",
      creationTimestamp: status.createdAt,
      labels: {},
    },
    spec: { request, imageKey, jobName: `job-${id}`, workspaceSubPath: id },
    status: {
      ...status,
      logBytes: 0,
      logOffset: 0,
      nextSequence: 1,
      events: [{ type: "status", status }],
    },
  };
}

describe("build store", () => {
  test("atomically enforces idempotency and one active image build", async () => {
    const store = new MemoryBuildStore();
    expect((await store.createBuild(build("one"))).created).toBe(true);
    expect((await store.createBuild(build("one"))).created).toBe(false);
    await expect(
      store.createBuild(build("one", "different-key")),
    ).rejects.toBeInstanceOf(BuildStoreConflictError);
    const replacement = await store.createBuild(build("two"));
    expect(replacement.created).toBe(true);
    expect(replacement.superseded?.[0]?.metadata.name).toBe("one");

    const first = (await store.getBuild("one"))!;
    const digest = `sha256:${"b".repeat(64)}` as Sha256Digest;
    first.metadata.resourceVersion = "3";
    Object.assign(first.status, {
      state: "succeeded",
      digest,
      finishedAt: first.status.createdAt,
    });
    await store.replaceBuild(first, "2");
    expect(
      (await store.createBuild(build("three", "2026-09-02T00:00:02.000Z")))
        .created,
    ).toBe(true);

    const changed = (await store.getBuild("one"))!;
    changed.metadata.resourceVersion = "3";
    changed.status.digest = `sha256:${"c".repeat(64)}`;
    await expect(store.replaceBuild(changed, "3")).rejects.toThrow("immutable");
  });

  test("optimistically updates resumable upload records without leaking mutable data", async () => {
    const store = new MemoryBuildStore();
    const digest = `sha256:${"d".repeat(64)}` as Sha256Digest;
    const upload = {
      apiVersion: BUILD_RECORD_API_VERSION,
      kind: "BuildUpload" as const,
      metadata: {
        name: "upload",
        resourceVersion: "1",
        creationTimestamp: "now",
      },
      spec: { digest, size: 3 },
      status: { offset: 0, data: new Uint8Array() },
    };
    await store.createUpload(upload);
    upload.status.data = Buffer.from("mutated");
    expect((await store.getUpload(digest))?.status.data.byteLength).toBe(0);
    const next = (await store.getUpload(digest))!;
    next.metadata.resourceVersion = "2";
    next.status = { offset: 3, data: Buffer.from("abc") };
    await store.replaceUpload(next, "1");
    await expect(store.replaceUpload(next, "1")).rejects.toBeInstanceOf(
      BuildStoreConflictError,
    );
  });

  test("supersedes only the current image and leaves terminal history", async () => {
    const store = new MemoryBuildStore();
    await store.createBuild(
      build("old", "project\0service\0image", "2026-09-02T00:00:00.000Z"),
    );
    const result = await store.createBuild(
      build("new", "project\0service\0image", "2026-09-02T00:00:01.000Z"),
    );
    expect(result.superseded?.[0]?.status.error).toBe(
      "Superseded by newer build",
    );
    expect((await store.getBuild("old"))?.status.state).toBe("failed");
    expect((await store.createBuild(build("new"))).created).toBe(false);
    expect(
      (await store.createBuild(build("other", "project\0service\0other")))
        .created,
    ).toBe(true);
  });

  test("concurrent same-image submissions have one active record", async () => {
    const store = new MemoryBuildStore();
    const results = await Promise.all([
      store.createBuild(build("first")),
      store.createBuild(build("second")),
      store.createBuild(build("third")),
    ]);
    expect(results.filter((result) => result.created)).toHaveLength(3);
    const active = (await store.listBuilds()).filter(
      (record) =>
        record.status.state !== "succeeded" && record.status.state !== "failed",
    );
    expect(active).toHaveLength(1);
    expect(active[0]?.metadata.name).toBe("third");
  });

  test("recovers an active record whose in-memory lock was lost", async () => {
    const store = new MemoryBuildStore();
    await store.createBuild(build("orphan"));
    (store as unknown as { active: Map<string, string> }).active.clear();

    const replacement = await store.createBuild(build("replacement"));
    expect(replacement.superseded?.[0]?.metadata.name).toBe("orphan");
    expect((await store.getBuild("orphan"))?.status.state).toBe("failed");
    expect(
      await store.ownsBuild("project\0service\0image", "replacement"),
    ).toBe(true);
  });

  test("a delayed older retry cannot reclaim a newer same-image lock", async () => {
    const store = new MemoryBuildStore();
    await store.createBuild(
      build("a", "project\0service\0image", "2026-09-02T00:00:00.000Z"),
    );
    (store as unknown as { active: Map<string, string> }).active.clear();
    await store.createBuild(
      build("b", "project\0service\0image", "2026-09-02T00:00:01.000Z"),
    );

    const delayed = await store.createBuild(
      build("a", "project\0service\0image", "2026-09-02T00:00:00.000Z"),
    );
    expect(delayed.created).toBe(false);
    expect(delayed.record.status.error).toBe("Superseded by newer build");
    expect(await store.ownsBuild("project\0service\0image", "b")).toBe(true);
  });

  test("returns cleanup metadata when a delayed candidate loses to a newer record", async () => {
    const store = new MemoryBuildStore();
    await store.createBuild(
      build("newer", "project\0service\0image", "2026-09-02T00:00:01.000Z"),
    );

    const result = await store.createBuild(
      build("delayed", "project\0service\0image", "2026-09-02T00:00:00.000Z"),
    );

    expect(result.created).toBe(false);
    expect(result.superseded?.map((record) => record.metadata.name)).toEqual([
      "delayed",
    ]);
    expect(
      (await store.createBuild(build("delayed"))).superseded,
    ).toBeUndefined();
  });

  test("orders and reconciles legacy records with invalid metadata timestamps", async () => {
    const store = new MemoryBuildStore();
    const legacy = build(
      "legacy",
      "project\0service\0image",
      "2026-09-02T00:00:00.000Z",
    );
    legacy.metadata.creationTimestamp = undefined as unknown as string;
    await store.createBuild(legacy);

    const replacement = await store.createBuild(
      build(
        "replacement",
        "project\0service\0image",
        "2026-09-02T00:00:01.000Z",
      ),
    );
    expect(replacement.created).toBe(true);
    expect((await store.getBuild("legacy"))?.status.state).toBe("failed");

    const malformed = build("a", "project\0service\0other");
    malformed.metadata.creationTimestamp = 0 as unknown as string;
    await store.createBuild(malformed);
    expect(
      (await store.listBuilds()).map((record) => record.metadata.name),
    ).toEqual(["a", "legacy", "replacement"]);
  });
});