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 "./no-undeclared-event-publish.js";

function makeFixture({ manifestUseCases, useCaseBody }) {
  const repoRoot = fs.mkdtempSync(path.join(os.tmpdir(), "nuep-"));
  const featureDir = path.join(repoRoot, "packages", "demo");
  fs.mkdirSync(path.join(featureDir, "src", "application", "use-cases"), { recursive: true });
  const useCasesObj = Object.entries(manifestUseCases)
    .map(([name, uc]) =>
      `    ${name}: { mutates: ${uc.mutates}, audits: [${uc.audits.map((a) => `"${a}"`).join(", ")}], publishes: [${uc.publishes.map((p) => `"${p}"`).join(", ")}], consumes: [] },`,
    )
    .join("\n");
  fs.writeFileSync(
    path.join(featureDir, "src", "feature.manifest.ts"),
    `export const demoManifest = defineFeature({
  name: "demo",
  requiredCores: [],
  useCases: {
${useCasesObj}
  },
  realtimeChannels: [],
  jobs: [],
} as const);`,
  );
  const useCaseFile = path.join(featureDir, "src", "application", "use-cases", "sign-up.use-case.ts");
  fs.writeFileSync(useCaseFile, useCaseBody);
  return { repoRoot, useCaseFile };
}

const tester = new RuleTester({
  languageOptions: {
    parser: await import("@typescript-eslint/parser"),
    ecmaVersion: "latest",
    sourceType: "module",
  },
});

describe("no-undeclared-event-publish", () => {
  it("passes when bus.publish event name matches manifest publishes[]", () => {
    const { repoRoot, useCaseFile } = makeFixture({
      manifestUseCases: { signUp: { mutates: true, audits: [], publishes: ["demo.signed-up"] } },
      useCaseBody: `export const signUpUseCase = (bus) => async () => { bus.publish("demo.signed-up", {}); };`,
    });
    tester.run("no-undeclared-event-publish", rule, {
      valid: [{ filename: useCaseFile, code: fs.readFileSync(useCaseFile, "utf8"), options: [{ repoRoot }] }],
      invalid: [],
    });
  });

  it("fires when bus.publish event name is not in manifest", () => {
    const { repoRoot, useCaseFile } = makeFixture({
      manifestUseCases: { signUp: { mutates: true, audits: [], publishes: [] } },
      useCaseBody: `export const signUpUseCase = (bus) => async () => { bus.publish("demo.signed-up", {}); };`,
    });
    tester.run("no-undeclared-event-publish", rule, {
      valid: [],
      invalid: [{
        filename: useCaseFile,
        code: fs.readFileSync(useCaseFile, "utf8"),
        options: [{ repoRoot }],
        errors: [{ messageId: "undeclared", data: { event: "demo.signed-up", useCase: "signUp" } }],
      }],
    });
  });

  it("is a no-op when bus.publish is called with a non-literal argument", () => {
    const { repoRoot, useCaseFile } = makeFixture({
      manifestUseCases: { signUp: { mutates: true, audits: [], publishes: [] } },
      useCaseBody: `export const signUpUseCase = (bus, name) => async () => { bus.publish(name, {}); };`,
    });
    tester.run("no-undeclared-event-publish", rule, {
      valid: [{ filename: useCaseFile, code: fs.readFileSync(useCaseFile, "utf8"), options: [{ repoRoot }] }],
      invalid: [],
    });
  });
});