import fs from "node:fs/promises";
import path from "node:path";
import { describe, expect, it, vi } from "vitest";
import {
  DEFAULT_AGENT_MAX_CONCURRENT,
  DEFAULT_SUBAGENT_MAX_CONCURRENT,
  resolveAgentMaxConcurrent,
  resolveSubagentMaxConcurrent,
} from "./agent-limits.js";
import { withTempHome } from "./test-helpers.js";

describe("agent concurrency defaults", () => {
  it("resolves defaults when unset", () => {
    expect(resolveAgentMaxConcurrent({})).toBe(DEFAULT_AGENT_MAX_CONCURRENT);
    expect(resolveSubagentMaxConcurrent({})).toBe(DEFAULT_SUBAGENT_MAX_CONCURRENT);
  });

  it("resolves configured values", () => {
    const cfg = {
      agents: {
        defaults: {
          maxConcurrent: 6,
          subagents: { maxConcurrent: 9 },
        },
      },
    };
    expect(resolveAgentMaxConcurrent(cfg)).toBe(6);
    expect(resolveSubagentMaxConcurrent(cfg)).toBe(9);
  });

  it("clamps invalid values to at least 1", () => {
    const cfg = {
      agents: {
        defaults: {
          maxConcurrent: 0,
          subagents: { maxConcurrent: -3 },
        },
      },
    };
    expect(resolveAgentMaxConcurrent(cfg)).toBe(1);
    expect(resolveSubagentMaxConcurrent(cfg)).toBe(1);
  });

  it("injects defaults on load", async () => {
    await withTempHome(async (home) => {
      const configDir = path.join(home, ".clawdbot");
      await fs.mkdir(configDir, { recursive: true });
      await fs.writeFile(
        path.join(configDir, "clawdbot.json"),
        JSON.stringify({}, null, 2),
        "utf-8",
      );

      vi.resetModules();
      const { loadConfig } = await import("./config.js");
      const cfg = loadConfig();

      expect(cfg.agents?.defaults?.maxConcurrent).toBe(DEFAULT_AGENT_MAX_CONCURRENT);
      expect(cfg.agents?.defaults?.subagents?.maxConcurrent).toBe(DEFAULT_SUBAGENT_MAX_CONCURRENT);
    });
  });
});