import assert from "node:assert/strict";
import crypto from "node:crypto";
import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { pathToFileURL } from "node:url";
import test from "node:test";
import ts from "typescript";

const root = path.resolve(import.meta.dirname, "../../..");
const temporary = fs.mkdtempSync(path.join(os.tmpdir(), "library-override-freshness-unit-"));
const sourcePath = path.join(root, "web/protocol/library-override-freshness.ts");
const transpiled = ts.transpileModule(fs.readFileSync(sourcePath, "utf8"), {
  compilerOptions: { module: ts.ModuleKind.ES2022, target: ts.ScriptTarget.ES2022 },
  fileName: sourcePath,
  reportDiagnostics: true,
});
assert.deepEqual(transpiled.diagnostics, []);
fs.writeFileSync(path.join(temporary, "library-override-freshness.mjs"), transpiled.outputText);
const freshness = await import(pathToFileURL(path.join(temporary, "library-override-freshness.mjs")));
const manifest = JSON.parse(fs.readFileSync(path.join(root, "tests/golden/M12-03L/manifest.json"), "utf8"));
const sha256 = (file) => crypto.createHash("sha256").update(fs.readFileSync(path.join(root, file))).digest("hex");
const library = "library:" + "a".repeat(64);
const digest = "b".repeat(64);
const token = "override-token:" + "c".repeat(64);
const state = (revision = 7) => ({
  schemaVersion: 1,
  sourceLibraryId: library,
  sourceGeneration: 4,
  sourceRevision: revision,
  dependencyClosureSha256: digest,
  invalidationToken: token,
  localDataBlockId: "Object/M12 Override Object",
  referenceSourceDataBlockId: "Object/M12 Override Object",
  hierarchyRootDataBlockId: "Object/M12 Override Object",
  owner: "LOCAL_OVERRIDE",
  readOnly: false,
  referenceReadOnly: true,
});
const request = (overrides = {}) => ({
  schemaVersion: 1,
  operation: "COMMIT_OVERRIDE",
  sourceLibraryId: library,
  sourceGeneration: 4,
  sourceRevision: 7,
  dependencyClosureSha256: digest,
  invalidationToken: token,
  baseRevision: 7,
  localDataBlockId: "Object/M12 Override Object",
  referenceSourceDataBlockId: "Object/M12 Override Object",
  hierarchyRootDataBlockId: "Object/M12 Override Object",
  owner: "LOCAL_OVERRIDE",
  readOnly: false,
  referenceReadOnly: true,
  ...overrides,
});

test("M12-03L binds the override freshness gate and evidence artifacts", () => {
  assert.equal(manifest.task, "M12-03L");
  assert.equal(manifest.parentTask, "M12-03K");
  assert.equal(manifest.nextTask, "M12-03M");
  for (const artifact of Object.values(manifest.artifacts)) assert.equal(sha256(artifact.path), artifact.sha256, artifact.path);
});

test("M12-03L allows only a fully matching source generation/revision commit", () => {
  assert.deepEqual(freshness.gateOverrideFreshness(state(), request()), { status: "READY", code: null });
});

test("M12-03L blocks stale generation, revision, closure, token, and identity before Main", () => {
  for (const overrides of [
    { sourceGeneration: 3 },
    { sourceRevision: 6, baseRevision: 6 },
    { dependencyClosureSha256: "d".repeat(64) },
    { invalidationToken: "override-token:" + "e".repeat(64) },
  ]) assert.deepEqual(freshness.gateOverrideFreshness(state(), request(overrides)), { status: "BLOCKED", code: "REVISION_CONFLICT" });
  assert.deepEqual(freshness.gateOverrideFreshness(state(), request({ localDataBlockId: "Object/Other" })), { status: "BLOCKED", code: "ASSET_SOURCE_HASH_MISMATCH" });
});

test("M12-03L rejects linked ownership, alternate operations, malformed tokens, and extra fields", () => {
  assert.equal(freshness.gateOverrideFreshness(state(), request({ owner: "SOURCE_LIBRARY", readOnly: true })).code, "LINKED_DATA_MUTATION_BLOCKED");
  assert.equal(freshness.gateOverrideFreshness(state(), request({ operation: "SET_LOCATION" })).code, "TASK_VALIDATION_FAILED");
  assert.equal(freshness.gateOverrideFreshness(state(), request({ invalidationToken: "bad" })).code, "TASK_VALIDATION_FAILED");
  assert.equal(freshness.gateOverrideFreshness(state(), { ...request(), future: true }).code, "TASK_VALIDATION_FAILED");
});

test.after(() => fs.rmSync(temporary, { recursive: true, force: true }));