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 repoRoot = path.resolve(import.meta.dirname, "../../..");
const temporary = fs.mkdtempSync(path.join(os.tmpdir(), "asset-catalog-compatibility-unit-"));
const sources = ["asset-path.ts", "capability-gates.ts", "asset-library-io.ts", "asset-catalog-v2.ts", "asset-catalog-compatibility.ts"];
for (const sourceName of sources) {
  const sourcePath = path.join(repoRoot, "web/protocol", sourceName);
  const result = ts.transpileModule(fs.readFileSync(sourcePath, "utf8"), {
    compilerOptions: { module: ts.ModuleKind.ES2022, target: ts.ScriptTarget.ES2022 },
    fileName: sourcePath,
    reportDiagnostics: true,
  });
  assert.deepEqual(result.diagnostics, []);
  fs.writeFileSync(path.join(temporary, sourceName.replace(/\.ts$/, ".mjs")), result.outputText.replaceAll(/from "\.\/([a-z0-9-]+)"/g, 'from "./$1.mjs"'));
}
const compatibility = await import(pathToFileURL(path.join(temporary, "asset-catalog-compatibility.mjs")));
const v1 = JSON.parse(fs.readFileSync(path.join(repoRoot, "tests/golden/M12-01D/catalog-v1.json"), "utf8"));
const v2 = JSON.parse(fs.readFileSync(path.join(repoRoot, "tests/golden/M12-01D/catalog-v2.json"), "utf8"));
const golden = JSON.parse(fs.readFileSync(path.join(repoRoot, "tests/golden/M12-01E/compatibility-report.json"), "utf8"));
const manifest = JSON.parse(fs.readFileSync(path.join(repoRoot, "tests/golden/M12-01E/manifest.json"), "utf8"));

test("M12-01E binds the compatibility policy and generated reports", () => {
  assert.equal(manifest.nextTask, "M12-01F");
  for (const artifact of Object.values(manifest.artifacts)) {
    const actual = crypto.createHash("sha256").update(fs.readFileSync(path.join(repoRoot, artifact.path))).digest("hex");
    assert.equal(actual, artifact.sha256, `${artifact.path} hash drifted`);
  }
});

test("M12-01E exposes schema v2 to a v1 reader as a bounded read-only snapshot", async () => {
  const before = structuredClone(v2);
  const report = await compatibility.inspectAssetCatalogForLegacyReader(v2, "READ");
  assert.deepEqual(report, golden.read);
  assert.equal(report.status, "READ_ONLY");
  assert.equal(report.code, "ASSET_SCHEMA_DOWNGRADE_BLOCKED");
  assert.deepEqual(report.snapshot.catalogs.map((item) => item.path), ["Animation", "Characters", "Characters/Heroes"]);
  assert.deepEqual(v2, before);
});

test("M12-01E blocks every legacy write and save without changing the source hash", async () => {
  for (const [operation, key] of [["CATALOG_WRITE", "catalogWrite"], ["ASSET_WRITE", "assetWrite"], ["SAVE", "save"]]) {
    const report = await compatibility.inspectAssetCatalogForLegacyReader(v2, operation);
    assert.deepEqual(report, golden[key]);
    assert.equal(report.status, "BLOCKED");
    assert.equal(report.code, "ASSET_SCHEMA_DOWNGRADE_BLOCKED");
    assert.equal(report.sourceSha256, golden.read.sourceSha256);
  }
});

test("M12-01E keeps native v1 ready and blocks unknown future schemas", async () => {
  assert.equal((await compatibility.inspectAssetCatalogForLegacyReader(v1, "SAVE")).status, "READY");
  assert.deepEqual(await compatibility.inspectAssetCatalogForLegacyReader({ schemaVersion: 3 }, "READ"), golden.future);
  assert.equal(golden.future.code, "PROTOCOL_MISMATCH");
  assert.equal(golden.future.recoverable, false);
});

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