/**
 * Tests for server/seed.ts
 *
 * Strategy: mock `./db` so getDb() returns a fake Drizzle-like object,
 * then assert that seedDefaults() inserts exactly the right agents
 * (or skips when agents already exist).
 */

import { describe, it, expect, vi, beforeEach } from "vitest";
import { DEFAULT_AGENTS, seedDefaults } from "./seed";

// ─── Mock getDb ───────────────────────────────────────────────────────────────

const mockInsert = vi.fn();
const mockSelect = vi.fn();

vi.mock("./db", () => ({
  getDb: vi.fn(),
}));

import { getDb } from "./db";

// Helper: build a minimal fake db that tracks inserts and returns a given count
function makeFakeDb(existingAgentCount: number) {
  const insertValues = vi.fn().mockResolvedValue([{ insertId: 1 }]);
  const insertInto = vi.fn().mockReturnValue({ values: insertValues });

  // select().from().  →  [{ value: count }]
  const fromFn = vi.fn().mockResolvedValue([{ value: existingAgentCount }]);
  const selectFn = vi.fn().mockReturnValue({ from: fromFn });

  return {
    insert: insertInto,
    select: selectFn,
    _insertValues: insertValues,
    _fromFn: fromFn,
  };
}

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

describe("DEFAULT_AGENTS", () => {
  it("should contain exactly 6 default agents", () => {
    expect(DEFAULT_AGENTS).toHaveLength(6);
  });

  it("should have exactly one orchestrator agent", () => {
    const orchestrators = DEFAULT_AGENTS.filter((a) => a.isOrchestrator);
    expect(orchestrators).toHaveLength(1);
    expect(orchestrators[0].name).toBe("GoClaw Orchestrator");
  });

  it("should mark all agents as system agents", () => {
    const nonSystem = DEFAULT_AGENTS.filter((a) => !a.isSystem);
    expect(nonSystem).toHaveLength(0);
  });

  it("should have unique roles", () => {
    const roles = DEFAULT_AGENTS.map((a) => a.role);
    const uniqueRoles = new Set(roles);
    expect(uniqueRoles.size).toBe(roles.length);
  });

  it("each agent should have allowedTools array", () => {
    for (const agent of DEFAULT_AGENTS) {
      expect(Array.isArray(agent.allowedTools)).toBe(true);
      expect(agent.allowedTools.length).toBeGreaterThan(0);
    }
  });

  it("orchestrator should have the most tools", () => {
    const orch = DEFAULT_AGENTS.find((a) => a.isOrchestrator)!;
    const maxTools = Math.max(...DEFAULT_AGENTS.map((a) => a.allowedTools.length));
    expect(orch.allowedTools.length).toBe(maxTools);
  });

  it("each agent should have a non-empty systemPrompt", () => {
    for (const agent of DEFAULT_AGENTS) {
      expect(agent.systemPrompt.trim().length).toBeGreaterThan(50);
    }
  });

  it("each agent should have valid temperature (0-1 as string)", () => {
    for (const agent of DEFAULT_AGENTS) {
      const temp = parseFloat(agent.temperature);
      expect(temp).toBeGreaterThanOrEqual(0);
      expect(temp).toBeLessThanOrEqual(1);
    }
  });

  it("each agent should have maxTokens > 0", () => {
    for (const agent of DEFAULT_AGENTS) {
      expect(agent.maxTokens).toBeGreaterThan(0);
    }
  });

  it("orchestrator should have the highest maxTokens", () => {
    const orch = DEFAULT_AGENTS.find((a) => a.isOrchestrator)!;
    const maxTok = Math.max(...DEFAULT_AGENTS.map((a) => a.maxTokens));
    expect(orch.maxTokens).toBe(maxTok);
  });

  it("each agent should have seeded metadata flag", () => {
    for (const agent of DEFAULT_AGENTS) {
      expect(agent.metadata.seeded).toBe(true);
    }
  });
});

describe("seedDefaults()", () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it("should skip seeding when DB is unavailable", async () => {
    vi.mocked(getDb).mockResolvedValue(null as any);
    await expect(seedDefaults()).resolves.toBeUndefined();
    // No inserts should happen
    expect(mockInsert).not.toHaveBeenCalled();
  });

  it("should skip seeding when agents already exist", async () => {
    const fakeDb = makeFakeDb(3); // 3 agents already exist
    vi.mocked(getDb).mockResolvedValue(fakeDb as any);

    await seedDefaults();

    // select was called to check count
    expect(fakeDb.select).toHaveBeenCalled();
    // insert was NOT called
    expect(fakeDb.insert).not.toHaveBeenCalled();
  });

  it("should insert all default agents when table is empty", async () => {
    const fakeDb = makeFakeDb(0); // empty table
    vi.mocked(getDb).mockResolvedValue(fakeDb as any);

    await seedDefaults();

    // insert should be called once per agent
    expect(fakeDb.insert).toHaveBeenCalledTimes(DEFAULT_AGENTS.length);
    expect(fakeDb._insertValues).toHaveBeenCalledTimes(DEFAULT_AGENTS.length);
  });

  it("should insert orchestrator agent with isOrchestrator=true", async () => {
    const fakeDb = makeFakeDb(0);
    vi.mocked(getDb).mockResolvedValue(fakeDb as any);

    await seedDefaults();

    // Find the call that inserted the orchestrator
    const calls = fakeDb._insertValues.mock.calls;
    const orchCall = calls.find((call: any[]) => call[0]?.isOrchestrator === true);
    expect(orchCall).toBeDefined();
    expect(orchCall![0].isSystem).toBe(true);
    expect(orchCall![0].name).toBe("GoClaw Orchestrator");
  });

  it("should insert all agents with isSystem=true", async () => {
    const fakeDb = makeFakeDb(0);
    vi.mocked(getDb).mockResolvedValue(fakeDb as any);

    await seedDefaults();

    const calls = fakeDb._insertValues.mock.calls;
    for (const call of calls) {
      expect(call[0].isSystem).toBe(true);
    }
  });

  it("should be idempotent — second call with existing data does nothing", async () => {
    // First call: empty DB → seeds
    const fakeDb1 = makeFakeDb(0);
    vi.mocked(getDb).mockResolvedValue(fakeDb1 as any);
    await seedDefaults();
    expect(fakeDb1.insert).toHaveBeenCalledTimes(DEFAULT_AGENTS.length);

    // Second call: DB now has agents → skips
    const fakeDb2 = makeFakeDb(DEFAULT_AGENTS.length);
    vi.mocked(getDb).mockResolvedValue(fakeDb2 as any);
    await seedDefaults();
    expect(fakeDb2.insert).not.toHaveBeenCalled();
  });

  it("should not throw when DB insert fails — just log error", async () => {
    const fakeDb = makeFakeDb(0);
    // Make insert throw
    fakeDb._insertValues.mockRejectedValue(new Error("DB error"));
    vi.mocked(getDb).mockResolvedValue(fakeDb as any);

    // Should not throw
    await expect(seedDefaults()).resolves.toBeUndefined();
  });
});