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 "./usecase-must-be-wired.js";

function makeFixture({
  manifestUseCases,
  binderBody,
  binderName = "bind-production.ts",
}) {
  const repoRoot = fs.mkdtempSync(path.join(os.tmpdir(), "umbw-"));
  const featureDir = path.join(repoRoot, "packages", "demo");
  fs.mkdirSync(path.join(featureDir, "src", "di"), { recursive: true });
  const useCasesObj = Object.entries(manifestUseCases)
    .map(
      ([name, uc]) =>
        `    ${name}: { mutates: ${uc.mutates}, audits: [${uc.audits.map((a) => `"${a}"`).join(", ")}], publishes: [], 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 binderFile = path.join(featureDir, "src", "di", binderName);
  fs.writeFileSync(binderFile, binderBody);
  return { repoRoot, binderFile };
}

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

describe("usecase-must-be-wired", () => {
  it("passes when every manifest use case has a wireUseCase call", () => {
    const { repoRoot, binderFile } = makeFixture({
      manifestUseCases: {
        signIn: { mutates: false, audits: [] },
        signUp: { mutates: true, audits: ["user.created"] },
      },
      binderBody: `
        export function bindProductionDemo(ctx) {
          wireUseCase({ name: "signIn", factory: signInUseCase });
          wireUseCase({ name: "signUp", factory: signUpUseCase });
        }
      `,
    });
    tester.run("usecase-must-be-wired", rule, {
      valid: [
        {
          filename: binderFile,
          code: fs.readFileSync(binderFile, "utf8"),
          options: [{ repoRoot }],
        },
      ],
      invalid: [],
    });
  });

  it("fires when a manifest use case is missing a wireUseCase call", () => {
    const { repoRoot, binderFile } = makeFixture({
      manifestUseCases: {
        signIn: { mutates: false, audits: [] },
        signUp: { mutates: true, audits: [] },
      },
      binderBody: `
        export function bindProductionDemo(ctx) {
          wireUseCase({ name: "signIn", factory: signInUseCase });
        }
      `,
    });
    tester.run("usecase-must-be-wired", rule, {
      valid: [],
      invalid: [
        {
          filename: binderFile,
          code: fs.readFileSync(binderFile, "utf8"),
          options: [{ repoRoot }],
          errors: [
            {
              messageId: "missing",
              data: { useCase: "signUp", feature: "demo" },
            },
          ],
        },
      ],
    });
  });

  it("also applies to bind-dev-seed.ts", () => {
    const { repoRoot, binderFile } = makeFixture({
      binderName: "bind-dev-seed.ts",
      manifestUseCases: { signIn: { mutates: false, audits: [] } },
      binderBody: `
        export async function bindDevSeedDemo(ctx) {
          // forgot to call wireUseCase
        }
      `,
    });
    tester.run("usecase-must-be-wired", rule, {
      valid: [],
      invalid: [
        {
          filename: binderFile,
          code: fs.readFileSync(binderFile, "utf8"),
          options: [{ repoRoot }],
          errors: [
            {
              messageId: "missing",
              data: { useCase: "signIn", feature: "demo" },
            },
          ],
        },
      ],
    });
  });

  it("is a no-op on files outside src/di/bind-*.ts", () => {
    const { repoRoot } = makeFixture({
      manifestUseCases: { signIn: { mutates: false, audits: [] } },
      binderBody: `// not a binder`,
    });
    const otherFile = path.join(
      repoRoot,
      "packages",
      "demo",
      "src",
      "other.ts",
    );
    fs.writeFileSync(otherFile, `export const x = 1;`);
    tester.run("usecase-must-be-wired", rule, {
      valid: [
        {
          filename: otherFile,
          code: fs.readFileSync(otherFile, "utf8"),
          options: [{ repoRoot }],
        },
      ],
      invalid: [],
    });
  });

  it("is a no-op when the feature manifest declares no use cases", () => {
    const { repoRoot, binderFile } = makeFixture({
      manifestUseCases: {},
      binderBody: `export function bindProductionDemo(ctx) {}`,
    });
    tester.run("usecase-must-be-wired", rule, {
      valid: [
        {
          filename: binderFile,
          code: fs.readFileSync(binderFile, "utf8"),
          options: [{ repoRoot }],
        },
      ],
      invalid: [],
    });
  });
});