import {
  copyFile,
  lstat,
  mkdir,
  readFile,
  symlink,
  writeFile,
} from "node:fs/promises";
import { join } from "node:path";

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

import { execFileOutput } from "../../../src/process/ExecFileOutput.js";
import { createTestTempDirectory } from "../../fixtures/temporaryDirectory.js";

const run = (
  root: string,
  command: string,
  arguments_: readonly string[],
  env?: NodeJS.ProcessEnv,
) =>
  execFileOutput(command, arguments_, {
    cwd: root,
    stopSignal: "SIGTERM",
    timeout: 30_000,
    maxBuffer: 1024 * 1024,
    ...(env === undefined ? {} : { env }),
  });

const git = (root: string, ...arguments_: string[]) =>
  run(root, "git", arguments_);

const commit = (root: string, message: string) =>
  git(
    root,
    "-c",
    "user.name=REA fixture",
    "-c",
    "user.email=fixture@example.test",
    "-c",
    "commit.gpgSign=false",
    "commit",
    "--quiet",
    "-m",
    message,
  );

const fixture = async () => {
  const root = await createTestTempDirectory("rea-development-tests-");
  await mkdir(join(root, "scripts", "lib"), { recursive: true });
  await mkdir(join(root, "src"));
  for (const path of [
    "scripts/run-development-tests.mjs",
    "scripts/run-exact-tests.mjs",
    "scripts/lib/development-tests.mjs",
    "scripts/lib/test-projects.mjs",
  ])
    await copyFile(join(process.cwd(), path), join(root, path));
  await symlink(
    join(process.cwd(), "node_modules"),
    join(root, "node_modules"),
    process.platform === "win32" ? "junction" : undefined,
  );
  await writeFile(join(root, "package.json"), '{"type":"module"}\n');
  await writeFile(join(root, ".gitignore"), "node_modules\nselected.txt\n");
  await writeFile(
    join(root, "vitest.config.mjs"),
    'export default { test: { projects: [{ test: { name: "domain", include: ["src/**/*.test.ts"] } }] } };\n',
  );
  await writeFile(join(root, "src/value.ts"), "export const value = 1;\n");
  await writeFile(
    join(root, "src/value.test.ts"),
    'import { expect, it } from "vitest"; import { writeFileSync } from "node:fs"; import { value } from "./value.js"; it("checks the selected source", () => { expect(value).toBe(1); writeFileSync("selected.txt", String(value)); });\n',
  );
  await git(root, "init", "--quiet", "-b", "main");
  await git(root, "add", ".");
  await commit(root, "fixture");
  return root;
};

// Assertions read the child's plain-text summary. An inherited color setting
// styled the counts in the CI lane; NO_COLOR takes precedence over FORCE_COLOR.
const testCommand = (root: string, ...arguments_: string[]) =>
  run(
    root,
    process.execPath,
    ["scripts/run-development-tests.mjs", ...arguments_],
    { ...process.env, NO_COLOR: "1" },
  );

describe("development test runner exact selection", () => {
  it("matches selected path casing to the host filesystem", async () => {
    const root = await fixture();
    try {
      await lstat(join(root, "src/VALUE.test.ts"));
    } catch (cause) {
      if (
        !(cause instanceof Error) ||
        !("code" in cause) ||
        cause.code !== "ENOENT"
      )
        throw cause;
      await expect(
        testCommand(root, "focused", "src/VALUE.test.ts"),
      ).rejects.toMatchObject({
        code: 1,
        stderr: expect.stringContaining("ENOENT"),
      });
      return;
    }
    await testCommand(root, "focused", "src/VALUE.test.ts");
    expect(await readFile(join(root, "selected.txt"), "utf8")).toBe("1");
  });

  it("matches Unicode-normalized aliases by filesystem identity", async () => {
    const root = await fixture();
    const composed = "caf\u00e9.test.ts";
    const decomposed = composed.normalize("NFD");
    await writeFile(
      join(root, "src", composed),
      'import { it } from "vitest"; it("checks the selected Unicode path", () => {});\n',
    );
    const selected = join(root, "src", decomposed);
    try {
      await lstat(selected);
    } catch (cause) {
      if (
        !(cause instanceof Error) ||
        !("code" in cause) ||
        cause.code !== "ENOENT"
      )
        throw cause;
      await expect(
        testCommand(root, "focused", `src/${decomposed}`),
      ).rejects.toMatchObject({
        code: 1,
        stderr: expect.stringContaining("ENOENT"),
      });
      return;
    }
    const result = await testCommand(root, "focused", `src/${decomposed}`);
    expect(result.stdout).toContain("1 passed");
  });

  it.each(["local", "focused"])(
    "runs only the exact selected file in %s mode",
    async (mode) => {
      const root = await fixture();
      await mkdir(join(root, "src", "nested", "src"), { recursive: true });
      await writeFile(
        join(root, "src", "nested", "src", "value.test.ts"),
        'import { it } from "vitest"; it("must not run", () => { throw new Error("unselected nested test ran"); });\n',
      );
      const result = await testCommand(root, mode, "src/value.test.ts");
      expect(result.stdout).toContain("1 passed");
      expect(result.stdout).not.toContain("nested/src/value.test.ts");
      expect(await readFile(join(root, "selected.txt"), "utf8")).toBe("1");
    },
  );

  it("fails when any selected existing test file is excluded from discovery", async () => {
    const root = await fixture();
    await writeFile(
      join(root, "src", "excluded.test.ts"),
      'import { it } from "vitest"; it("excluded", () => {});\n',
    );
    await writeFile(
      join(root, "vitest.config.mjs"),
      'export default { test: { projects: [{ test: { name: "domain", include: ["src/value.test.ts"] } }] } };\n',
    );
    await expect(
      testCommand(root, "focused", "src/value.test.ts", "src/excluded.test.ts"),
    ).rejects.toMatchObject({
      code: 1,
      stderr: expect.stringContaining(
        "Selected test files were not discovered: src/excluded.test.ts",
      ),
    });
  });

  it("runs every selected file and preserves selected test failures", async () => {
    const root = await fixture();
    await writeFile(
      join(root, "src", "failure.test.ts"),
      'import { it } from "vitest"; it("selected failure", () => { throw new Error("selected regression"); });\n',
    );
    await expect(
      testCommand(root, "focused", "src/value.test.ts", "src/failure.test.ts"),
    ).rejects.toMatchObject({
      code: 1,
      stdout: expect.stringContaining("1 failed | 1 passed"),
      stderr: expect.stringContaining("selected regression"),
    });
    expect(await readFile(join(root, "selected.txt"), "utf8")).toBe("1");
  });

  it("preserves all configured projects for an exact file", async () => {
    const root = await fixture();
    await writeFile(
      join(root, "vitest.config.mjs"),
      'export default { test: { projects: ["domain", "evaluation"].map(name => ({ test: { name, include: ["src/value.test.ts"] } })) } };\n',
    );
    const result = await testCommand(root, "focused", "src/value.test.ts");
    expect(result.stdout).toMatch(/Test Files\s+2 passed/u);
  });

  it("fails an exact file with no tests even when another selected file passes", async () => {
    const root = await fixture();
    await writeFile(join(root, "src", "empty.test.ts"), "export {};\n");
    await expect(
      testCommand(root, "focused", "src/value.test.ts", "src/empty.test.ts"),
    ).rejects.toMatchObject({
      code: 1,
      stderr: expect.stringContaining("No test suite found"),
    });
    expect(await readFile(join(root, "selected.txt"), "utf8")).toBe("1");
  });
});

describe("development test runner public CLI", () => {
  it("runs an explicitly selected source test on a clean tree without build artifacts", async () => {
    const root = await fixture();
    const { stdout: status } = await git(root, "status", "--porcelain");
    expect(status).toBe("");
    await testCommand(root, "local", "src/value.test.ts");
    expect(await readFile(join(root, "selected.txt"), "utf8")).toBe("1");
  });

  it("plans an exact local test without building", async () => {
    const root = await fixture();
    const { stdout } = await testCommand(
      root,
      "local",
      "src/value.test.ts",
      "--dry-run",
    );
    expect(JSON.parse(stdout)).toMatchObject({
      needsBuild: false,
      artifactTasks: [],
      vitestArguments: expect.arrayContaining([
        "run",
        "--project",
        "domain",
        "--project",
        "services",
        "--project",
        "adapters",
        "--project",
        "composition",
        "--project",
        "conformance",
        "--project",
        "evaluation",
        "src/value.test.ts",
      ]),
    });
  });

  it("uses committed dependency changes to select source tests and reports failures", async () => {
    const root = await fixture();
    const { stdout: base } = await git(root, "rev-parse", "HEAD");
    await writeFile(join(root, "src/value.ts"), "export const value = 2;\n");
    await git(root, "add", "src/value.ts");
    await commit(root, "change dependency");
    await expect(
      testCommand(root, "changed", "--base", base.trim()),
    ).rejects.toMatchObject({
      code: 1,
      stdout: expect.stringContaining("src/value.test.ts"),
      stderr: expect.stringContaining("expected 2 to be 1"),
    });
  });

  it("runs changed and focused tests from a committed branch regression", async () => {
    const root = await fixture();
    const { stdout: baseline } = await git(root, "rev-parse", "HEAD");
    await git(root, "update-ref", "refs/remotes/origin/main", baseline.trim());
    await git(root, "switch", "--quiet", "-c", "regression");
    await writeFile(join(root, "src/value.ts"), "export const value = 2;\n");
    await writeFile(
      join(root, "src/value.test.ts"),
      'import { expect, it } from "vitest"; import { value } from "./value.js"; it("checks current source", () => expect(value).toBe(2));\n',
    );
    await git(root, "add", "src");
    await commit(root, "regression fix");
    expect((await git(root, "status", "--porcelain")).stdout).toBe("");

    const changed = await testCommand(root, "changed");
    expect(changed.stdout).toContain("1 passed");
    const focused = await testCommand(root, "focused", "src/value.test.ts");
    expect(focused.stdout).toContain("1 passed");
  }, 60_000);

  it("reports a missing comparison base and rejects missing or compiled-boundary paths", async () => {
    const root = await fixture();
    await expect(
      testCommand(root, "changed", "--base", "missing-test-base", "--dry-run"),
    ).rejects.toMatchObject({
      code: 1,
      stderr: expect.stringContaining(
        "Fetch origin/main or pass --base REVISION",
      ),
    });
    await expect(
      testCommand(root, "focused", "src/missing.test.ts"),
    ).rejects.toMatchObject({
      code: 1,
      stderr: expect.stringContaining("ENOENT"),
    });
    await expect(
      testCommand(root, "local", "tests/acceptance/runtime.test.ts"),
    ).rejects.toMatchObject({
      code: 1,
      stderr: expect.stringContaining("Use test:focused"),
    });
  });
});