import { execFileSync } from "node:child_process";
import { readFile, writeFile } from "node:fs/promises";
import { join } from "node:path";
import { pathToFileURL } from "node:url";

import { describe, expect, it } from "vitest";
import {
  BUILT_TEST_PROJECTS,
  SOURCE_TEST_PROJECTS,
  projectForTest,
} from "../../../scripts/lib/test-projects.mjs";
import {
  developmentTestPlan,
  parseDevelopmentTestRequest,
} from "../../../scripts/lib/development-tests.mjs";

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

const repository = process.cwd();

describe("canonical test-project ownership", () => {
  it("assigns every tracked test file exactly once to source or built", () => {
    const files = execFileSync("git", ["ls-files", "*.test.ts"], {
      cwd: repository,
      encoding: "utf8",
    })
      .trim()
      .split("\n")
      .filter(Boolean);
    const grouped = new Map<string, string[]>();
    for (const file of files) {
      const project = projectForTest(file);
      grouped.set(project.group, [...(grouped.get(project.group) ?? []), file]);
    }

    expect(grouped.get("source")).not.toBeUndefined();
    expect(grouped.get("built")).not.toBeUndefined();
    expect(
      (grouped.get("source")?.length ?? 0) +
        (grouped.get("built")?.length ?? 0),
    ).toBe(files.length);
    expect(
      SOURCE_TEST_PROJECTS.reduce(
        (count, project) => count + project.include.length,
        0,
      ),
    ).toBeGreaterThan(0);
    expect(
      BUILT_TEST_PROJECTS.every((project) => project.group === "built"),
    ).toBe(true);
    expect(() => projectForTest("tests/unowned/example.test.ts")).toThrow(
      "No test project owns",
    );
  });

  it("owns the Hopper real-provider conformance test as built and requires preparation", () => {
    const testPath =
      "tests/conformance/providers/hopper/realHopperSearch.test.ts";
    expect(projectForTest(testPath)).toMatchObject({
      name: "boundary",
      group: "built",
    });
    expect(() => parseDevelopmentTestRequest("local", [testPath])).toThrow(
      `Use test:focused for built test projects: ${testPath}`,
    );
    const request = parseDevelopmentTestRequest("focused", [testPath]);
    expect(developmentTestPlan(request)).toMatchObject({ needsBuild: true });
  });

  it("uses canonical selectors in Vitest while retaining independent runner policy", async () => {
    const config = await readFile(join(repository, "vitest.config.ts"), "utf8");
    expect(config).toContain(
      "[...SOURCE_TEST_PROJECTS, ...BUILT_TEST_PROJECTS]",
    );
    expect(config).toContain("PROJECT_POLICIES");
    expect(config).not.toContain('"src/{contracts,domain}/**/*.test.ts"');
  });

  it.each([
    { flags: [], heap: 384, timeout: 30_000, lines: 68 },
    { flags: ["--coverage"], heap: 512, timeout: 60_000, lines: 68 },
    { flags: ["--coverage.enabled"], heap: 512, timeout: 60_000, lines: 68 },
    { flags: ["--coverage=false"], heap: 384, timeout: 30_000, lines: 68 },
    {
      flags: ["--coverage.enabled=false"],
      heap: 384,
      timeout: 30_000,
      lines: 68,
    },
    {
      flags: ["--coverage.provider=v8"],
      heap: 384,
      timeout: 30_000,
      lines: 68,
    },
    {
      flags: ["--coverage.enabled", "--shard", "1/6"],
      heap: 512,
      timeout: 60_000,
      lines: 0,
    },
    {
      flags: ["--coverage.enabled=false", "--shard=1/6"],
      heap: 384,
      timeout: 30_000,
      lines: 0,
    },
  ])(
    "resolves worker resources from actual CLI options: $flags",
    async ({ flags, heap, timeout, lines }) => {
      const root = await createTestTempDirectory("rea-vitest-worker-policy-");
      const script = join(root, "worker-policy.mjs");
      await writeFile(
        script,
        `
      import config from ${JSON.stringify(pathToFileURL(join(repository, "vitest.config.ts")).href)};
      const project = config.test.projects.find(project => project.test.name === 'cli-boundary');
      console.log(JSON.stringify({
        execArgv: project.test.execArgv,
        timeout: config.test.testTimeout,
        lines: config.test.coverage.thresholds.lines,
      }));
    `,
      );
      const result = await execFileOutput(
        process.execPath,
        ["--import", "tsx", script, ...flags],
        {
          cwd: repository,
          timeout: 10_000,
          maxBuffer: 64 * 1024,
          stopSignal: "SIGTERM",
        },
      );
      expect(JSON.parse(result.stdout)).toEqual({
        execArgv: [`--max-old-space-size=${String(heap)}`],
        timeout,
        lines,
      });
    },
  );
});

describe("test module isolation", () => {
  it("keeps module mocks out of projects that share one module graph", async () => {
    // A mock registered after another file in the same worker loaded the
    // module never applies, so the test's outcome depends on file scheduling.
    const root = await createTestTempDirectory("rea-vitest-mock-isolation-");
    const script = join(root, "project-isolation.mjs");
    await writeFile(
      script,
      `
      import config from ${JSON.stringify(pathToFileURL(join(repository, "vitest.config.ts")).href)};
      console.log(JSON.stringify(Object.fromEntries(
        config.test.projects.map(project => [project.test.name, project.test.isolate !== false]),
      )));
    `,
    );
    const result = await execFileOutput(
      process.execPath,
      ["--import", "tsx", script],
      {
        cwd: repository,
        timeout: 10_000,
        maxBuffer: 64 * 1024,
        stopSignal: "SIGTERM",
      },
    );
    const isolated = JSON.parse(result.stdout) as Record<string, boolean>;
    const mocking = execFileSync(
      "git",
      ["grep", "-l", "-E", String.raw`vi\.(mock|doMock)\(`, "--", "*.test.ts"],
      { cwd: repository, encoding: "utf8" },
    )
      .trim()
      .split("\n")
      .filter(Boolean);
    expect(mocking.length).toBeGreaterThan(0);
    expect(
      mocking.filter((file) => isolated[projectForTest(file).name] !== true),
    ).toEqual([]);
  });
});