// Case-sharded harnesses run in every job without Vitest file sharding.
export const effectFiles = ["tests/harness/effect.test.ts", "tests/harness/effect4.test.ts"];
export const corpusFiles = [
  "tests/harness/differential.test.ts", "tests/harness/llvm-differential.test.ts",
  "tests/harness/npm.test.ts", "tests/harness/server.test.ts",
  "tests/harness/test262.test.ts", "tests/harness/vercel-e2e.test.ts",
  "tests/harness/three.test.ts",
];
const coverageFile = "tests/harness/coverage.test.ts";
const cacheFile = "packages/compiler/src/backend/native-toolchain.test.ts";
// Expensive integration suites keep their existing owners and run serially
// beside the corpus, avoiding worker contention between large compilations.
const isolatedFiles = [
  ["self-hosting serialization", "tests/harness/self-hosting-serialization.test.ts", 5],
  ["self-hosting", "tests/harness/self-hosting.test.ts", 1],
  ["self-hosting LLVM emitter", "tests/harness/self-hosting-llvm-emitter.test.ts", 2],
  ["fetch", "tests/harness/fetch.test.ts", 3],
  ["npm static", "tests/harness/npm-static.test.ts", 4],
  ["surface manifest", "tests/harness/surface-manifest.test.ts", 5],
];
export const fileExclusions = [...corpusFiles, ...effectFiles, coverageFile, cacheFile,
  ...isolatedFiles.map(([,file]) => file), "tests/harness/self-hosting-native-driver.test.ts"];

export function ciTestPlan({shard, flavor, workers = 4}) {
  const match = /^([1-9]\d*)\/([1-9]\d*)$/.exec(shard);
  if (!match || !Number.isSafeInteger(Number(match[1])) || !Number.isSafeInteger(Number(match[2])) || Number(match[1]) > Number(match[2])) throw new Error("invalid CI shard");
  if (flavor !== "plain" && flavor !== "san") throw new Error("invalid CI flavor");
  if (!Number.isInteger(workers) || workers < 1) throw new Error("invalid CI worker budget");
  const index = Number(match[1]), count = Number(match[2]);
  const sideWorkers = workers === 1 ? 0 : 1;
  const env = {SCRIPTC_TEST_SHARD: shard, SCRIPTC_SAN: flavor === "san" ? "1" : ""};
  const side = [{name: "file-sharded tests", args: ["test", "--passWithNoTests", "--shard=" + shard, ...fileExclusions.map(file => "--exclude=" + file)], env: {...env, SCRIPTC_TEST_WORKERS: "1"}}];
  for (const [name,file,owner] of isolatedFiles) {
    if ((owner - 1) % count + 1 === index) side.push({name, args: ["test",file], env: {...env, SCRIPTC_TEST_WORKERS: "1"}});
  }
  // Frontend coverage and cache invalidation do not consume sanitizer state.
  if (flavor === "plain") {
    side.push({name: "native-cache correctness", args: ["test",cacheFile], env: {...env, SCRIPTC_TEST_WORKERS: "1", SCRIPTC_CACHE_TEST_SHARD: shard, SCRIPTC_TEST_STABLE_TOOLCHAIN: "0"}});
    side.push({name: "coverage sweep", args: ["test",coverageFile], env: {...env, SCRIPTC_TEST_WORKERS: "1"}});
  }
  return {sideWorkers, corpus: {name: "case-sharded corpus", args: ["test",...corpusFiles], env: {...env, SCRIPTC_TEST_WORKERS: String(workers - sideWorkers), SCRIPTC_LLVM_TEST_MODE: "dev"}}, side};
}