import { afterEach, expect, test } from "bun:test";
import { mkdirSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from "node:fs";
import { tmpdir } from "node:os";
import { join } from "node:path";
import { detectLegacyApiBodies } from "../src/migrations/legacy-api-body.ts";
import { updateApp } from "../src/update.ts";

const SOURCE = `page Hello {
  ssr {
    api ssrUsers GET /api/users/ssr {
      return userNames(users)
    }
  }

  view { <main>x</main> }
}
`;

test("a legacy bare body is detected with its free identifiers", () => {
  const found = detectLegacyApiBodies(SOURCE);

  expect(found).toHaveLength(1);
  expect(found[0]!.name).toBe("ssrUsers");
  expect(found[0]!.freeIdentifiers).toContain("users");
  expect(found[0]!.freeIdentifiers).toContain("userNames");
});

test("a sectioned block is not reported", () => {
  const sectioned = `page P {
  apis { x GET /api/x { response { return data.users } } }
  view { <main>x</main> }
}
`;

  expect(detectLegacyApiBodies(sectioned)).toEqual([]);
});

test("an identifier that only appears inside a string literal is not collected", () => {
  const source = `page Hello {
  ssr {
    api ssrUsers GET /api/users/ssr {
      return "users are great, ask userNames"
    }
  }

  view { <main>x</main> }
}
`;

  const found = detectLegacyApiBodies(source);

  expect(found).toHaveLength(1);
  expect(found[0]!.freeIdentifiers).not.toContain("users");
  expect(found[0]!.freeIdentifiers).not.toContain("userNames");
});

test("a property-access key is not collected, only its object", () => {
  const source = `page Hello {
  ssr {
    api ssrUsers GET /api/users/ssr {
      return u.name
    }
  }

  view { <main>x</main> }
}
`;

  const found = detectLegacyApiBodies(source);

  expect(found).toHaveLength(1);
  expect(found[0]!.freeIdentifiers).toContain("u");
  expect(found[0]!.freeIdentifiers).not.toContain("name");
});

const roots: string[] = [];
afterEach(() => {
  for (const root of roots.splice(0)) rmSync(root, { recursive: true, force: true });
});

function project(): string {
  const root = mkdtempSync(join(tmpdir(), "wrnexus-migrate-legacy-api-body-"));
  roots.push(root);
  mkdirSync(join(root, "app"), { recursive: true });
  writeFileSync(
    join(root, "package.json"),
    JSON.stringify({
      name: "legacy-api-body-migrate-app",
      dependencies: { "@wrnexus/core": "^0.8.0" },
      wrnexus: { version: "0.8.0" },
    }),
  );
  return root;
}

test("a full update run leaves a legacy bare body file byte-identical and reports it", () => {
  const root = project();
  writeFileSync(join(root, "app", "Hello.wrn"), SOURCE);

  const report = {
    changedAutomatically: [] as string[],
    needsReview: [] as string[],
    unresolvedImports: [] as string[],
    ambiguousFunctions: [] as string[],
    legacyOutputPayloads: [] as string[],
    parseFailures: [] as string[],
  };

  updateApp(root, "0.9.0", false, { report });

  const after = readFileSync(join(root, "app", "Hello.wrn"), "utf8");

  expect(after).toBe(SOURCE);
  expect(report.needsReview.some((entry) => entry.includes("ssrUsers"))).toBe(true);
});