/**
 * test:scoped — verifies the TIA selection logic used by `npm run test:scoped`.
 *
 * The shell script (`scripts/quality/test-scoped.sh`) delegates to
 * `select-impacted-tests.mjs` for the actual test selection. This test
 * exercises that selection logic with synthetic inputs so the gate stays
 * correct without running the full shell pipeline.
 */
import { test } from "node:test";
import assert from "node:assert/strict";
import { selectImpacted } from "../../scripts/quality/select-impacted-tests.mjs";

// Minimal impact map for testing.
const MAP = {
  sources: {
    "src/app/api/v1/chat/route.ts": [
      "tests/unit/api/chat-route.test.ts",
      "tests/unit/api/cors.test.ts",
    ],
    "open-sse/handlers/chatCore.ts": [
      "tests/unit/api/chat-route.test.ts",
      "tests/unit/combo/combo-strategy.test.ts",
    ],
    "src/shared/constants/routingStrategies.ts": [
      "tests/unit/combo/combo-strategy.test.ts",
    ],
  },
};

test("selectImpacted: returns impacted tests for changed source files", () => {
  const sel = selectImpacted({
    changed: ["src/app/api/v1/chat/route.ts"],
    map: MAP,
  });
  assert.deepEqual(sel, ["tests/unit/api/chat-route.test.ts", "tests/unit/api/cors.test.ts"]);
});

test("selectImpacted: deduplicates tests impacted by multiple changed files", () => {
  const sel = selectImpacted({
    changed: ["src/app/api/v1/chat/route.ts", "open-sse/handlers/chatCore.ts"],
    map: MAP,
  });
  // chat-route.test.ts is impacted by both — must appear once
  assert.deepEqual(sel, [
    "tests/unit/api/chat-route.test.ts",
    "tests/unit/api/cors.test.ts",
    "tests/unit/combo/combo-strategy.test.ts",
  ]);
});

test("selectImpacted: returns __RUN_ALL__ when a hub file changes", () => {
  const sel = selectImpacted({
    changed: ["tsconfig.json", "src/app/api/v1/chat/route.ts"],
    map: MAP,
  });
  assert.deepEqual(sel, ["__RUN_ALL__"]);
});

test("selectImpacted: returns __RUN_ALL__ when a source file has no map entry", () => {
  const sel = selectImpacted({
    changed: ["src/lib/new-module.ts"],
    map: MAP,
  });
  assert.deepEqual(sel, ["__RUN_ALL__"]);
});

test("selectImpacted: includes changed test files directly", () => {
  const sel = selectImpacted({
    changed: ["tests/unit/api/chat-route.test.ts"],
    map: MAP,
  });
  assert.deepEqual(sel, ["tests/unit/api/chat-route.test.ts"]);
});

test("selectImpacted: returns empty array when no files impact tests", () => {
  // A non-source, non-test file that isn't a hub
  const sel = selectImpacted({
    changed: ["docs/architecture/ARCHITECTURE.md"],
    map: MAP,
  });
  assert.deepEqual(sel, []);
});

test("selectImpacted: non-source files are ignored (no __RUN_ALL__)", () => {
  const sel = selectImpacted({
    changed: ["README.md", ".gitignore"],
    map: MAP,
  });
  assert.deepEqual(sel, []);
});