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-analytics-event.js";

function makeFixture({ manifestUseCases, useCaseBody }) {
  const repoRoot = fs.mkdtempSync(path.join(os.tmpdir(), "nuae-"));
  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: ${uc.mutates}, audits: [], publishes: [], consumes: [], analyticsEvents: [${uc.analyticsEvents.map((e) => `"${e}"`).join(", ")}] },`,
    )
    .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-analytics-event", () => {
  it("passes when analytics.track slug matches manifest analyticsEvents[]", () => {
    const { repoRoot, useCaseFile } = makeFixture({
      manifestUseCases: {
        signUp: { mutates: true, analyticsEvents: ["user.signed-up"] },
      },
      useCaseBody: `export const signUpUseCase = (analytics) => async () => { analytics.track("user.signed-up", {}); };`,
    });
    tester.run("no-undeclared-analytics-event", rule, {
      valid: [
        {
          filename: useCaseFile,
          code: fs.readFileSync(useCaseFile, "utf8"),
          options: [{ repoRoot }],
        },
      ],
      invalid: [],
    });
  });

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

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

  it("is a no-op for files that are not use-case files", () => {
    const repoRoot = fs.mkdtempSync(path.join(os.tmpdir(), "nuae-"));
    const featureDir = path.join(repoRoot, "packages", "demo");
    fs.mkdirSync(path.join(featureDir, "src", "application"), {
      recursive: true,
    });
    const controllerFile = path.join(
      featureDir,
      "src",
      "application",
      "sign-up.controller.ts",
    );
    fs.writeFileSync(
      controllerFile,
      `export const signUpController = (analytics) => async () => { analytics.track("user.signed-up", {}); };`,
    );
    tester.run("no-undeclared-analytics-event", rule, {
      valid: [
        {
          filename: controllerFile,
          code: fs.readFileSync(controllerFile, "utf8"),
          options: [{ repoRoot }],
        },
      ],
      invalid: [],
    });
  });

  it("is a no-op when manifest has no entry for the use case", () => {
    const { repoRoot, useCaseFile } = makeFixture({
      manifestUseCases: {},
      useCaseBody: `export const signUpUseCase = (analytics) => async () => { analytics.track("user.signed-up", {}); };`,
    });
    tester.run("no-undeclared-analytics-event", rule, {
      valid: [
        {
          filename: useCaseFile,
          code: fs.readFileSync(useCaseFile, "utf8"),
          options: [{ repoRoot }],
        },
      ],
      invalid: [],
    });
  });
});