import { describe, it } from "vitest";
import { RuleTester } from "eslint";
import path from "node:path";
import os from "node:os";
import fs from "node:fs";
import rule from "./entity-must-have-test.js";

function makeModelsDir() {
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), "emht-"));
  const modelsDir = path.join(dir, "src", "entities", "models");
  fs.mkdirSync(modelsDir, { recursive: true });
  return modelsDir;
}

function makeEntityFixture({ withTest }) {
  const modelsDir = makeModelsDir();
  const entity = path.join(modelsDir, "cookie.ts");
  fs.writeFileSync(entity, `export const cookie = {};`);
  if (withTest) {
    fs.writeFileSync(
      path.join(modelsDir, "cookie.test.ts"),
      `import { it } from "vitest"; it("works", () => {});`,
    );
  }
  return { entity };
}

const tester = new RuleTester({
  languageOptions: { ecmaVersion: "latest", sourceType: "module" },
});

describe("entity-must-have-test", () => {
  it("passes when a sibling .test.ts exists", () => {
    const { entity } = makeEntityFixture({ withTest: true });
    tester.run("entity-must-have-test", rule, {
      valid: [{ filename: entity, code: fs.readFileSync(entity, "utf8") }],
      invalid: [],
    });
  });

  it("fires when no sibling test file exists", () => {
    const { entity } = makeEntityFixture({ withTest: false });
    tester.run("entity-must-have-test", rule, {
      valid: [],
      invalid: [
        {
          filename: entity,
          code: fs.readFileSync(entity, "utf8"),
          errors: [{ messageId: "missingTest" }],
        },
      ],
    });
  });

  it("ignores files outside entities/models", () => {
    const dir = fs.mkdtempSync(path.join(os.tmpdir(), "emht-"));
    const other = path.join(dir, "helper.ts");
    fs.writeFileSync(other, `export const x = 1;`);
    tester.run("entity-must-have-test", rule, {
      valid: [{ filename: other, code: "export const x = 1;" }],
      invalid: [],
    });
  });

  it("ignores the index.ts barrel inside entities/models", () => {
    const modelsDir = makeModelsDir();
    const index = path.join(modelsDir, "index.ts");
    fs.writeFileSync(index, `export {};`);
    tester.run("entity-must-have-test", rule, {
      valid: [{ filename: index, code: "export {};" }],
      invalid: [],
    });
  });
});