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-writer-unit-"));
const sourcePath = path.join(root, "web/protocol/library-override-writer.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-writer.mjs"), transpiled.outputText);
const writer = await import(pathToFileURL(path.join(temporary, "library-override-writer.mjs")));
const manifest = JSON.parse(fs.readFileSync(path.join(root, "tests/golden/M12-03K/manifest.json"), "utf8"));
const sha256 = (file) => crypto.createHash("sha256").update(fs.readFileSync(path.join(root, file))).digest("hex");
const state = (revision = 3, value = 2.5) => ({
  schemaVersion: 1,
  revision,
  localDataBlockId: "Object/M12 Override Object",
  referenceSourceDataBlockId: "Object/M12 Override Object",
  hierarchyRootDataBlockId: "Object/M12 Override Object",
  owner: "LOCAL_OVERRIDE",
  readOnly: false,
  referenceReadOnly: true,
  propertyPath: '["m12_override_value"]',
  value,
});
const request = (baseRevision = 3, value = 4.5) => ({
  schemaVersion: 1,
  operation: "SET_M12_OVERRIDE_VALUE",
  baseRevision,
  localDataBlockId: "Object/M12 Override Object",
  referenceSourceDataBlockId: "Object/M12 Override Object",
  hierarchyRootDataBlockId: "Object/M12 Override Object",
  owner: "LOCAL_OVERRIDE",
  readOnly: false,
  referenceReadOnly: true,
  propertyPath: '["m12_override_value"]',
  value,
});

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

test("M12-03K applies exactly the verified override property and advances one revision", () => {
  const result = writer.applyOverrideWriter(state(), request());
  assert.equal(result.status, "APPLIED");
  assert.equal(result.code, null);
  assert.equal(result.state.revision, 4);
  assert.equal(result.state.value, 4.5);
  assert.equal(result.state.propertyPath, writer.LIBRARY_OVERRIDE_PROPERTY_PATH);
  assert.equal(result.state.owner, "LOCAL_OVERRIDE");
  assert.equal(result.state.referenceReadOnly, true);
});

test("M12-03K blocks stale, linked-owner, identity, and second-property writes", () => {
  assert.equal(writer.applyOverrideWriter(state(3), request(2)).code, "REVISION_CONFLICT");
  assert.equal(writer.applyOverrideWriter(state(), { ...request(), owner: "SOURCE_LIBRARY", readOnly: true, referenceReadOnly: true }).code, "LINKED_DATA_MUTATION_BLOCKED");
  assert.equal(writer.applyOverrideWriter(state(), { ...request(), localDataBlockId: "Object/Other" }).code, "ASSET_SOURCE_HASH_MISMATCH");
  assert.equal(writer.applyOverrideWriter(state(), { ...request(), propertyPath: "location" }).code, "EDITOR_WRITER_UNAVAILABLE");
  assert.equal(writer.applyOverrideWriter(state(), { ...request(), operation: "SET_LOCATION" }).code, "TASK_VALIDATION_FAILED");
});

test("M12-03K rejects malformed values and undeclared fields before the writer", () => {
  assert.equal(writer.applyOverrideWriter(state(), { ...request(), future: true }).code, "TASK_VALIDATION_FAILED");
  assert.equal(writer.applyOverrideWriter(state(), { ...request(), value: Number.NaN }).code, "TASK_VALIDATION_FAILED");
  assert.throws(() => writer.parseOverrideWriterState({ ...state(), propertyPath: "location" }), { code: "EDITOR_WRITER_UNAVAILABLE" });
  assert.throws(() => writer.parseOverrideWriterRequest({ ...request(), value: 1e9 }), { code: "TASK_VALIDATION_FAILED" });
});

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