import test from "node:test";
import assert from "node:assert/strict";
import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { loadDevServerConfig } from "../src/config.js";
import { DevServerService } from "../src/dev-server-service.js";

function fixture(config) {
  const root = fs.mkdtempSync(path.join(os.tmpdir(), "dev-server-mcp-"));
  const configPath = path.join(root, "services.json");
  fs.writeFileSync(configPath, JSON.stringify(config));
  return { root, configPath, cleanup: () => fs.rmSync(root, { recursive: true, force: true }) };
}

test("configuration rejects commands outside the operator allowlist", () => {
  const item = fixture({ services: { web: { command: "sh", args: [], cwd: "." } } });
  try {
    assert.throws(() => loadDevServerConfig({ configPath: item.configPath, workspaceRoot: item.root, allowedCommands: ["node"] }), /not allowlisted/);
  } finally { item.cleanup(); }
});

test("configuration rejects workspace traversal", () => {
  // Refused on the shape of the path, before anything is resolved, so it holds for a
  // per-execution service too - whose directory does not exist yet and so cannot be resolved.
  const item = fixture({ services: { web: { command: "node", args: [], cwd: ".." } } });
  try {
    assert.throws(() => loadDevServerConfig({ configPath: item.configPath, workspaceRoot: item.root, allowedCommands: ["node"] }), /Invalid cwd/);
  } finally { item.cleanup(); }
});

test("configuration cannot replace the safe process environment", () => {
  const item = fixture({ services: { web: { command: "node", args: [], cwd: ".", env: { PATH: "/workspace/bin" } } } });
  try {
    assert.throws(() => loadDevServerConfig({ configPath: item.configPath, workspaceRoot: item.root, allowedCommands: ["node"] }), /Invalid environment/);
  } finally { item.cleanup(); }
});

test("list exposes an operator-written setup contract without exposing caller-controlled commands", () => {
  const item = fixture({ services: { web: {
    command: "node", args: ["server.js", "${port}"], cwd: ".", workspaceMode: "execution",
    agentInstructions: "Create server.js, bind 0.0.0.0 and use process.env.PORT."
  } } });
  try {
    const config = loadDevServerConfig({ configPath: item.configPath, workspaceRoot: item.root, allowedCommands: ["node"] });
    const devServer = new DevServerService({ services: config.services });
    const listed = devServer.list({ key: "execution-1" }).services[0];
    assert.equal(listed.agentInstructions, "Create server.js, bind 0.0.0.0 and use process.env.PORT.");
    assert.equal(Object.hasOwn(listed, "command"), false);
  } finally { item.cleanup(); }
});

test("dev server starts only configured arguments, captures logs, and stops the process group", async () => {
  const item = fixture({ services: { web: { command: process.execPath, args: ["-e", "console.log('ready'); setInterval(() => {}, 1000)"], cwd: ".", shutdownTimeoutMs: 500 } } });
  try {
    const config = loadDevServerConfig({ configPath: item.configPath, workspaceRoot: item.root, allowedCommands: [process.execPath] });
    const devServer = new DevServerService({ services: config.services });
    const started = await devServer.start({ service: "web" });
    assert.equal(started.status, "running");
    await new Promise((resolve) => setTimeout(resolve, 50));
    assert.match(devServer.logs({ service: "web" }).logs, /ready/);
    const stopped = await devServer.stop({ service: "web" });
    assert.equal(stopped.status, "stopped");
    await devServer.close();
  } finally { item.cleanup(); }
});

test("unknown services and oversized log requests fail closed", () => {
  const devServer = new DevServerService({ services: new Map([["web", { id: "web", clientCwd: ".", publicUrl: null }]]) });
  assert.throws(() => devServer.status({ service: "missing" }), /Unknown service/);
  assert.throws(() => devServer.logs({ service: "web", tailBytes: 999999 }), /tailBytes/);
});