import { chmod, mkdir, mkdtemp, rm, writeFile } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";

import { describe, expect, it } from "vitest";

import { createCli } from "./cli.js";
import { createSystemDoctorHost } from "./doctorRuntime.js";
import { captureProcessScenarioFile } from "./application/ProcessCli.js";
import { runCapabilityStatus } from "./application/DirectAnalysisStatus.js";
import { probeProcessCaptureCapability } from "./application/ProcessHarness.js";
import { parseEvidence } from "./domain/evidence.js";
import { parseProcessCapture } from "./domain/processCapture.js";

describe("the CLI takes its environment as an input", () => {
  it("builds from an explicitly supplied environment", () => {
    expect(createCli({ REA_LOG_LEVEL: "debug" })).toBeDefined();
    expect(createCli({})).toBeDefined();
  });

  it("still builds with no environment supplied", () => {
    // The default keeps production behaviour identical.
    expect(createCli()).toBeDefined();
    expect(createSystemDoctorHost()).toBeDefined();
  });

  it("resolves from injected PATH and inherits injected env with scenario overrides", async ({
    skip,
  }) => {
    const capability = await probeProcessCaptureCapability();
    if (!capability.available) {
      skip("Process capture is unavailable on this host");
      return;
    }

    const root = await mkdtemp(join(tmpdir(), "rea-cli-env-process-"));
    const bin = join(root, "bin");
    const executable = join(bin, "rea-injected-process-probe");
    const scenarioPath = join(root, "scenario.json");
    try {
      await mkdir(bin);
      await writeFile(
        executable,
        [
          "#!/bin/sh",
          'printf "%s|%s\\n" "$REA_CAPTURE_INJECTED_MARKER" "$REA_CAPTURE_SCENARIO_OVERRIDE"',
        ].join("\n"),
      );
      await chmod(executable, 0o755);
      await writeFile(
        scenarioPath,
        JSON.stringify({
          executable: "rea-injected-process-probe",
          working_directory: root,
          environment: { REA_CAPTURE_SCENARIO_OVERRIDE: "scenario-value" },
        }),
      );

      const result = await captureProcessScenarioFile(scenarioPath, {
        PATH: bin,
        REA_CAPTURE_INJECTED_MARKER: "injected-value",
        REA_CAPTURE_SCENARIO_OVERRIDE: "host-value",
      });
      const evidence = parseEvidence(result);
      const capture = parseProcessCapture(evidence.normalized_result);
      expect(capture.frames.map(({ data }) => data).join("")).toContain(
        "injected-value|scenario-value",
      );
    } finally {
      await rm(root, { recursive: true, force: true });
    }
  });

  it("reports session status from a supplied environment", async () => {
    // An invalid configuration must surface through the caller's supplied
    // environment rather than whatever the process happens to carry.
    const result = await runCapabilityStatus(undefined, {
      REA_LOG_LEVEL: "not-a-level",
    });
    expect(result).toMatchObject({ error: expect.anything() });
  });
});