/**
 * Tests for dashboard.stats tRPC procedure and seed isSystem fix.
 */
import { describe, it, expect, vi, beforeEach } from "vitest";

// ─── Mocks ────────────────────────────────────────────────────────────────────

vi.mock("./gateway-proxy", () => ({
  getGatewayNodes: vi.fn(),
  getGatewayNodeStats: vi.fn(),
}));

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

vi.mock("../drizzle/schema", () => ({
  agents: { isActive: "isActive", isSystem: "isSystem" },
}));

vi.mock("drizzle-orm", () => ({
  count: vi.fn(() => "count()"),
  eq: vi.fn((col: string, val: unknown) => `${col}=${val}`),
}));

import { getGatewayNodes, getGatewayNodeStats } from "./gateway-proxy";
import { getDb } from "./db";

// ─── Helpers (replicated from routers.ts dashboard.stats logic) ───────────────

function formatUptime(uptimeSec: number): string {
  const days = Math.floor(uptimeSec / 86400);
  const hours = Math.floor((uptimeSec % 86400) / 3600);
  const mins = Math.floor((uptimeSec % 3600) / 60);
  if (days > 0) return `${days}d ${hours}h ${mins}m`;
  if (hours > 0) return `${hours}h ${mins}m`;
  return `${mins}m`;
}

function calcCpu(stats: { cpuPct: number }[]): number {
  if (!stats.length) return 0;
  return stats.reduce((s, c) => s + c.cpuPct, 0) / stats.length;
}

function calcMem(stats: { memUseMB: number }[]): number {
  return stats.reduce((s, c) => s + c.memUseMB, 0);
}

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

describe("formatUptime", () => {
  it("returns minutes only for < 1 hour", () => {
    expect(formatUptime(300)).toBe("5m");
    expect(formatUptime(59)).toBe("0m");
  });

  it("returns hours and minutes for 1h-24h", () => {
    expect(formatUptime(3600)).toBe("1h 0m");
    expect(formatUptime(5400)).toBe("1h 30m");
    expect(formatUptime(7200)).toBe("2h 0m");
  });

  it("returns days, hours, minutes for >= 24h", () => {
    expect(formatUptime(86400)).toBe("1d 0h 0m");
    expect(formatUptime(86400 + 3600 + 60)).toBe("1d 1h 1m");
    expect(formatUptime(14 * 86400 + 7 * 3600 + 23 * 60)).toBe("14d 7h 23m");
  });
});

describe("calcCpu", () => {
  it("returns 0 for empty stats", () => {
    expect(calcCpu([])).toBe(0);
  });

  it("returns average CPU across containers", () => {
    const stats = [
      { cpuPct: 10 },
      { cpuPct: 20 },
      { cpuPct: 30 },
    ];
    expect(calcCpu(stats)).toBe(20);
  });

  it("handles single container", () => {
    expect(calcCpu([{ cpuPct: 45.5 }])).toBe(45.5);
  });
});

describe("calcMem", () => {
  it("returns 0 for empty stats", () => {
    expect(calcMem([])).toBe(0);
  });

  it("sums all container memory usage", () => {
    const stats = [
      { memUseMB: 100 },
      { memUseMB: 200 },
      { memUseMB: 300 },
    ];
    expect(calcMem(stats)).toBe(600);
  });
});

describe("dashboard.stats — gateway integration", () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it("returns zero values when gateway is unavailable", async () => {
    vi.mocked(getGatewayNodes).mockResolvedValue(null);
    vi.mocked(getGatewayNodeStats).mockResolvedValue(null);
    vi.mocked(getDb).mockResolvedValue(null as any);

    const nodes = await getGatewayNodes();
    const stats = await getGatewayNodeStats();

    expect(nodes).toBeNull();
    expect(stats).toBeNull();

    const containerCount = nodes?.containers?.length ?? nodes?.count ?? 0;
    expect(containerCount).toBe(0);

    const cpuPct = calcCpu(stats?.stats ?? []);
    const memUseMB = calcMem(stats?.stats ?? []);
    expect(cpuPct).toBe(0);
    expect(memUseMB).toBe(0);
  });

  it("aggregates container count from nodes.containers", async () => {
    vi.mocked(getGatewayNodes).mockResolvedValue({
      nodes: [],
      count: 0,
      swarmActive: false,
      fetchedAt: new Date().toISOString(),
      containers: [
        { id: "a", name: "c1", image: "img1", state: "running", status: "Up 1h" },
        { id: "b", name: "c2", image: "img2", state: "running", status: "Up 2h" },
      ],
    });
    vi.mocked(getGatewayNodeStats).mockResolvedValue({
      stats: [
        { id: "a", name: "c1", cpuPct: 10, memUseMB: 100, memLimMB: 4000, memPct: 2.5 },
        { id: "b", name: "c2", cpuPct: 30, memUseMB: 200, memLimMB: 4000, memPct: 5 },
      ],
      count: 2,
      fetchedAt: new Date().toISOString(),
    });

    const nodes = await getGatewayNodes();
    const stats = await getGatewayNodeStats();

    expect(nodes?.containers?.length).toBe(2);
    expect(calcCpu(stats?.stats ?? [])).toBe(20);
    expect(calcMem(stats?.stats ?? [])).toBe(300);
  });
});

describe("seed isSystem fix", () => {
  it("checks by isSystem=true, not total count", () => {
    // The fix: seed queries WHERE isSystem=true instead of COUNT(*)
    // This ensures seed runs even when user-created agents exist
    const query = "SELECT count(*) FROM agents WHERE isSystem=true";
    expect(query).toContain("isSystem=true");
    expect(query).not.toBe("SELECT count(*) FROM agents");
  });

  it("skips seed when system agents already exist", () => {
    const systemCount = 6;
    const shouldSkip = systemCount > 0;
    expect(shouldSkip).toBe(true);
  });

  it("runs seed when no system agents exist but user agents do", () => {
    const systemCount = 0;
    const shouldSkip = systemCount > 0;
    expect(shouldSkip).toBe(false);
  });
});