import { currentClientRegistrationCommand } from "../../../src/application/ClientRegistrationIdentity.js";
import { mkdir, readFile, writeFile } from "node:fs/promises";
import { delimiter, join, resolve } from "node:path";
import { expect } from "vitest";
import { z } from "zod";

import { createTestTempDirectory } from "../../fixtures/temporaryDirectory.js";
import { cliTest } from "../../support/cli/cliFixture.js";

const ompConfigurationSchema = z.object({
  mcpServers: z.object({
    rea: z.object({ command: z.string(), args: z.array(z.string()) }),
  }),
});

const controlledRunnerFixture = async (home: string) => {
  const bin = join(home, "bin");
  const script = join(home, "runner-fixture.cjs");
  const log = join(home, "runner-calls.jsonl");
  await mkdir(bin);
  await writeFile(log, "");
  await writeFile(
    script,
    `const { appendFileSync } = require("node:fs");
appendFileSync(process.env.REA_TEST_RUNNER_LOG, JSON.stringify({
  runner: process.argv[2],
  arguments: process.argv.slice(3),
  home: process.env.HOME,
  npm_command: process.env.npm_command,
  user_agent: process.env.npm_config_user_agent,
}) + "\\n");
console.log("controlled runner fixture");
`,
  );
  for (const runner of ["npx", "bunx"]) {
    await writeFile(
      join(bin, process.platform === "win32" ? `${runner}.cmd` : runner),
      process.platform === "win32"
        ? `@echo off\r\n"%REA_TEST_NODE%" "%REA_TEST_RUNNER_SCRIPT%" ${runner} %*\r\n`
        : `#!/bin/sh\nexec "$REA_TEST_NODE" "$REA_TEST_RUNNER_SCRIPT" ${runner} "$@"\n`,
      { mode: 0o700 },
    );
  }
  return {
    log,
    environment: {
      PATH: [bin, process.env.PATH ?? ""].join(delimiter),
      REA_TEST_NODE: process.execPath,
      REA_TEST_RUNNER_SCRIPT: script,
      REA_TEST_RUNNER_LOG: log,
    },
  };
};

// Package runners set these variables for the bin they launch from a temporary cache.
// Decoy runners record any accidental acquisition; setup retains its launch identity.
for (const { runner, userAgent } of [
  { runner: "npx", userAgent: "npm/10.9.0 node/v24.11.0 linux x64" },
  { runner: "bunx", userAgent: "bun/1.4.2 npm/? node/v26.3.0 linux x64" },
] as const) {
  cliTest(
    `${runner} setup binds the selected installation without invoking another runner`,
    async ({ cli }) => {
      const home = await createTestTempDirectory("rea-package-runner-");
      const controlledRunner = await controlledRunnerFixture(home);
      const run = (arguments_: readonly string[]) =>
        cli.run({
          arguments: arguments_,
          cwd: home,
          environment: {
            ...controlledRunner.environment,
            HOME: home,
            USERPROFILE: home,
            npm_command: "exec",
            npm_config_user_agent: userAgent,
          },
          timeoutMs: 20_000,
        });
      const setup = await run([
        "setup",
        "--client",
        "omp",
        "--no-skill",
        "--yes",
        "--json",
      ]);
      expect(setup.exitCode).toBe(0);
      expect(setup.json).toMatchObject({ status: "ready" });
      expect(setup.json).not.toHaveProperty("prewarm");
      const configuration = ompConfigurationSchema.parse(
        JSON.parse(
          await readFile(join(home, ".omp", "agent", "mcp.json"), "utf8"),
        ),
      );
      const { command, args } = configuration.mcpServers.rea;
      expect([command, ...args]).toEqual(
        currentClientRegistrationCommand({
          entrypointPath: resolve("scripts/rea.mjs"),
          environment: controlledRunner.environment,
        }),
      );
      const doctor = await run(["doctor", "--client", "omp", "--json"]);
      expect(doctor.json).toMatchObject({
        identity: { registrations: [{ client: "omp", state: "aligned" }] },
      });
      const repeat = await run([
        "setup",
        "--client",
        "omp",
        "--no-skill",
        "--dry-run",
        "--json",
      ]);
      expect(repeat.json).toMatchObject({ plannedActions: [] });
      expect(await readFile(controlledRunner.log, "utf8")).toBe("");
    },
  );
}