import { test } from "node:test";
import assert from "node:assert/strict";
import { fileURLToPath } from "node:url";
import { dirname, join } from "node:path";
import fs from "node:fs";
import os from "node:os";
import { ModIndexer } from "../out/indexer/indexer.js";
import { CachedDirectoryWalker } from "../out/indexer/fileScanner.js";
import { DocumentCache, ShallowScanCache } from "../out/indexer/caches.js";
import { resolveReferenceTargetsForType } from "../out/indexer/refs.js";

const root = dirname(dirname(fileURLToPath(import.meta.url)));
const project = join(root, "test", "fixtures", "minimod");
const sdk = join(root, "test", "fixtures", "fakesdk");

async function buildIndex() {
  const indexer = new ModIndexer({
    projectDir: project,
    sdkDir: sdk,
    builtmodsDirs: [join(sdk, "builtmods")],
    indexSageXml: true,
    additionalDataSearchPaths: [],
    walker: new CachedDirectoryWalker(),
  });
  return indexer.build();
}

test("indexes assets, defines, streams and include errors", async () => {
  const idx = await buildIndex();

  assert.equal(idx.stats.streams, 2); // static + global
  assert.ok(idx.assetsById.has("testtank"));
  assert.ok(idx.assetsById.has("testtankcannon"));
  assert.ok(idx.assetsById.has("testtankcommandset"));
  assert.ok(idx.assetsById.has("testtexture"));
  assert.ok(idx.assetsById.has("thempgamerules"));
  assert.ok(idx.assetsById.has("vanillatank"), "vanilla data via reference include fallback");
  assert.ok(idx.assetsById.has("basevehicle"));

  const baseVehicle = idx.assetsById.get("basevehicle");
  assert.ok(baseVehicle.some((d) => d.viaInstance), "instance-included asset marked");

  const defs = idx.defines.get("test_health");
  assert.equal(defs?.[0].value, "100.0");

  const missing = idx.diagnostics.find((d) => d.code === "include-not-found");
  assert.ok(missing, "missing include reported");
  assert.match(missing.message, /Missing\/File\.xml/);

  // Nested xi:include: existing target is walked, missing target is reported.
  assert.ok(
    idx.diagnostics.some((d) => /Missing\/Nested\.xml/.test(d.message)),
    "nested missing xi:include reported",
  );
  assert.ok(
    idx.files.has(
      join(project, "Data", "Includes", "Fragment.xml").toLowerCase(),
    ),
    "nested xi:include target indexed",
  );
  assert.ok(
    idx.assetsById.has("fraglight"),
    "nested xi:include target assets available",
  );

  const staticStream = idx.streams.find((s) => s.name === "static");
  assert.ok(staticStream.files.size >= 4);
});

test("provides include source candidates", async () => {
  const idx = await buildIndex();
  const xml = idx.sourceCandidates.filter((c) => c.source.endsWith(".xml"));
  assert.ok(xml.length >= 4);
  assert.ok(xml.some((c) => c.source === "Includes/Units.xml"));
  assert.ok(xml.some((c) => c.source === "DATA:static.xml"));
});

test("indexes art-asset XML (.w3x / sniffed .w3d) via shallow scan and skips binary", async () => {
  const idx = await buildIndex();

  // The .w3x hub chain: Mod.xml -> VehicleArt.xml -> Models/Tank_SKN.w3x.
  const skn = idx.assetsById.get("tank_skn");
  assert.ok(skn?.some((d) => d.type === "W3DContainer"), "W3DContainer from .w3x indexed");
  assert.ok(
    idx.assetsById.get("tank_skl")?.some((d) => d.type === "W3DHierarchy"),
    "W3DHierarchy from .w3x indexed",
  );
  const container = skn.find((d) => d.type === "W3DContainer");
  assert.match(container.file, /Tank_SKN\.w3x$/);
  assert.ok(container.line > 0, "definition line recorded from shallow scan");

  // Unknown extension with XML content is sniffed and indexed.
  assert.ok(
    idx.assetsById.get("tank_fp")?.some((d) => d.type === "W3DMesh"),
    "unknown-extension XML (.w3d) sniffed and indexed",
  );

  // Binary content is registered as a file but never parsed.
  assert.equal(idx.assetsById.get("tank_damaged"), undefined, "binary asset never indexed");
  assert.ok(
    idx.files.has(
      join(project, "Data", "Includes", "Models", "Tank_Damaged.dds").toLowerCase(),
    ),
    "binary include target registered as a file",
  );

  // The reported Harbinger scenario: <Model Name="Tank_SKN"/> (refType
  // BaseRenderAssetType) must resolve to the W3DContainer defined in the w3x.
  const targets = resolveReferenceTargetsForType(
    idx,
    "ScriptedModelDrawModel",
    "Name",
    "Tank_SKN",
  );
  assert.equal(targets.length, 1);
  assert.equal(targets[0].def.type, "W3DContainer");
  assert.match(targets[0].def.file, /Tank_SKN\.w3x$/);
});

test("w3x files appear in Include source completion candidates", async () => {
  const idx = await buildIndex();
  assert.ok(
    idx.sourceCandidates.some((c) => c.source === "Includes/Models/Tank_SKN.w3x"),
    "project-relative w3x candidate",
  );
  assert.ok(
    idx.sourceCandidates.some((c) => c.source === "DATA:Includes/Models/Tank_SKN.w3x"),
    "DATA: w3x candidate",
  );
});

test("shallow scans and full parses are cached across rebuilds", async () => {
  const documentCache = new DocumentCache();
  const shallowCache = new ShallowScanCache();
  const makeIndexer = () =>
    new ModIndexer({
      projectDir: project,
      sdkDir: sdk,
      builtmodsDirs: [join(sdk, "builtmods")],
      indexSageXml: true,
      additionalDataSearchPaths: [],
      walker: new CachedDirectoryWalker(),
      documentCache,
      shallowCache,
    });

  const first = await makeIndexer().build();
  const second = await makeIndexer().build();

  assert.equal(first.stats.shallowScannedFiles, 2, "w3x + sniffed w3d scanned on first build");
  assert.equal(second.stats.shallowScannedFiles, 0, "unchanged art assets are not re-scanned");
  assert.equal(second.stats.shallowCacheHits, 2);
  assert.equal(second.stats.assetCount, first.stats.assetCount);
  assert.equal(second.stats.indexedFiles, first.stats.indexedFiles);
});

test("w3x with a UTF-8 BOM is indexed with correct offsets", async (t) => {
  const tmp = fs.mkdtempSync(join(os.tmpdir(), "ra3modxml-bom-"));
  t.after(() => fs.rmSync(tmp, { recursive: true, force: true }));
  const projectDir = join(tmp, "project");
  fs.mkdirSync(join(projectDir, "Data", "Models"), { recursive: true });
  fs.writeFileSync(
    join(projectDir, "Data", "Mod.xml"),
    `<?xml version="1.0" encoding="utf-8"?>
<AssetDeclaration>
  <Includes>
    <Include type="all" source="Models/Tank_BOM.w3x"/>
  </Includes>
</AssetDeclaration>`,
    "utf8",
  );
  fs.writeFileSync(
    join(projectDir, "Data", "Models", "Tank_BOM.w3x"),
    "\uFEFF<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
      "<AssetDeclaration>\n" +
      "  <W3DContainer id=\"Tank_BOM\" />\n" +
      "</AssetDeclaration>\n",
    "utf8",
  );

  const idx = await new ModIndexer({
    projectDir,
    sdkDir: sdk,
    builtmodsDirs: [join(sdk, "builtmods")],
    indexSageXml: false,
    additionalDataSearchPaths: [],
    walker: new CachedDirectoryWalker(),
  }).build();

  const def = idx.assetsById.get("tank_bom")?.find((d) => d.type === "W3DContainer");
  assert.ok(def, "BOM-prefixed w3x asset indexed");
  assert.equal(def.line, 3, "id line is correct despite the BOM");
});