import { beforeEach, describe, expect, it, mock } from "bun:test";

// ── Mock the auth module ────────────────────────────────────────────────────
const mockResolveToken = mock();
const mockResolveAllIdentities = mock();

mock.module("../../../src/providers/gcp/auth", () => ({
  resolveToken: mockResolveToken,
  resolveAllIdentities: mockResolveAllIdentities,
}));

// ── Mock the client module ──────────────────────────────────────────────────
const mockListSecrets = mock();
const mockAccessSecretVersion = mock();
const mockListProjects = mock();
const mockExtractSecretShortName = mock();
const mockBuildSecretName = mock();

mock.module("../../../src/providers/gcp/client", () => ({
  listSecrets: mockListSecrets,
  accessSecretVersion: mockAccessSecretVersion,
  listProjects: mockListProjects,
  extractSecretShortName: mockExtractSecretShortName,
  buildSecretName: mockBuildSecretName,
}));

import { GcpSecretsService } from "../../../src/providers/gcp/secrets";

// ── Helpers ─────────────────────────────────────────────────────────────────

function setupAuth() {
  mockResolveToken.mockResolvedValue({
    token: "fake-gcp-token",
    expiresOn: Date.now() / 1000 + 3600,
    projectId: "test-project",
  });
}

function makeSecretItem(name: string) {
  return { name, createTime: "2024-01-01T00:00:00Z" };
}

// ── Tests ───────────────────────────────────────────────────────────────────

describe("GcpSecretsService", () => {
  let service: GcpSecretsService;

  beforeEach(() => {
    mockResolveToken.mockReset();
    mockResolveAllIdentities.mockReset();
    mockListSecrets.mockReset();
    mockAccessSecretVersion.mockReset();
    mockListProjects.mockReset();
    mockExtractSecretShortName.mockReset();
    mockBuildSecretName.mockReset();
    // Default: short name extraction passes through the name
    mockExtractSecretShortName.mockImplementation(
      (name: string) => name.split("/").pop() ?? name,
    );
    delete process.env.GCP_PROJECT;
    delete process.env.GOOGLE_CLOUD_PROJECT;
    service = new GcpSecretsService();
  });

  // ── Auth failure ──────────────────────────────────────────────────────

  it("returns failure when authentication fails", async () => {
    mockResolveToken.mockRejectedValue(new Error("No GCP credentials"));

    const result = await service.execute();

    expect(result.success).toBe(true);
    const data = result.data as any;
    expect(data.ok).toBe(false);
    expect(data.authError).toBeArray();
    expect(data.authError[0]).toContain("GCP auth failed");
  });

  // ── No projects found ─────────────────────────────────────────────────

  it("returns failure when no projects found", async () => {
    setupAuth();
    mockListProjects.mockResolvedValue([]);

    const result = await service.execute();

    expect(result.success).toBe(true);
    const data = result.data as any;
    expect(data.ok).toBe(false);
    expect(data.projectsFound).toBe(0);
    expect(data.dumped).toBe(0);
  });

  // ── Env var project discovery ─────────────────────────────────────────

  it("discovers project from GCP_PROJECT env var", async () => {
    setupAuth();
    process.env.GCP_PROJECT = "my-project";
    mockListSecrets.mockResolvedValue([
      makeSecretItem("projects/my-project/secrets/db-pass"),
    ]);
    mockAccessSecretVersion.mockResolvedValue("s3cr3t");

    const result = await service.execute();

    expect(result.success).toBe(true);
    const data = result.data as any;
    expect(data.projects).toHaveLength(1);
    expect(data.projects[0].projectId).toBe("my-project");
    expect(data.projects[0].secrets["db-pass"]).toBe("s3cr3t");
  });

  // ── Single project, single secret ─────────────────────────────────────

  it("returns success with single project and secret", async () => {
    setupAuth();
    process.env.GCP_PROJECT = "proj-1";
    mockListSecrets.mockResolvedValue([
      makeSecretItem("projects/proj-1/secrets/api-key"),
    ]);
    mockAccessSecretVersion.mockResolvedValue("sk-abc");

    const result = await service.execute();

    expect(result.success).toBe(true);
    const data = result.data as any;
    expect(data.projects).toHaveLength(1);
    expect(data.projects[0].secrets["api-key"]).toBe("sk-abc");
  });

  // ── Multiple secrets in one project ───────────────────────────────────

  it("returns success with multiple secrets", async () => {
    setupAuth();
    process.env.GCP_PROJECT = "proj-1";
    mockListSecrets.mockResolvedValue([
      makeSecretItem("projects/proj-1/secrets/s1"),
      makeSecretItem("projects/proj-1/secrets/s2"),
      makeSecretItem("projects/proj-1/secrets/s3"),
    ]);
    mockAccessSecretVersion.mockImplementation((name: string) => {
      if (name.includes("/s1")) return Promise.resolve("val1");
      if (name.includes("/s2")) return Promise.resolve("val2");
      if (name.includes("/s3")) return Promise.resolve("val3");
      return Promise.resolve(undefined);
    });

    const result = await service.execute();

    expect(result.success).toBe(true);
    const secrets = (result.data as any).projects[0].secrets;
    expect(Object.keys(secrets)).toHaveLength(3);
  });

  // ── Empty project (no secrets) ────────────────────────────────────────

  it("handles project with no secrets", async () => {
    setupAuth();
    process.env.GCP_PROJECT = "empty-proj";
    mockListSecrets.mockResolvedValue([]);

    const result = await service.execute();

    expect(result.success).toBe(true);
    const data = result.data as any;
    expect(data.projects).toHaveLength(1);
    expect(data.projects[0].secrets).toEqual({});
  });

  // ── All projects fail ─────────────────────────────────────────────────

  it("returns failure when all projects fail", async () => {
    setupAuth();
    process.env.GCP_PROJECT = "bad-project";
    mockListSecrets.mockRejectedValue(new Error("PermissionDenied"));

    const result = await service.execute();

    expect(result.success).toBe(true);
    const data = result.data as any;
    expect(data.ok).toBe(false);
    expect(data.dumped).toBe(0);
    expect(data.errored).toBe(1);
  });

  // ── Multiple projects via ARM ─────────────────────────────────────────

  it("discovers projects via Cloud Resource Manager", async () => {
    setupAuth();
    mockListProjects.mockResolvedValue([
      { projectId: "p1", name: "Project One", lifecycleState: "ACTIVE" },
      { projectId: "p2", name: "Project Two", lifecycleState: "ACTIVE" },
    ]);
    mockListSecrets.mockResolvedValue([
      makeSecretItem("projects/p1/secrets/s1"),
    ]);
    mockAccessSecretVersion.mockResolvedValue("v1");

    const result = await service.execute();

    expect(result.success).toBe(true);
    const data = result.data as any;
    expect(data.projects).toHaveLength(2);
  });
});