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, fileURLToPath } from "node:url";
import ts from "../../web/node_modules/typescript/lib/typescript.js";

const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../..");
const outputPath = path.resolve(process.argv[2] ?? path.join(root, "tests/golden/M12-06B/web-import-report.json"));
const parentManifestPath = path.join(root, "tests/golden/M12-06A/manifest.json");
const fixtureReportPath = path.join(root, "tests/golden/M12-06A/desktop-fixtures.json");
const fixtureRoot = path.join(root, "tests/files/web/m12_glb_desktop_v1");
const temporary = fs.mkdtempSync(path.join(os.tmpdir(), "m12-06b-import-report-"));
const sha256 = (bytes) => crypto.createHash("sha256").update(bytes).digest("hex");
const stableValue = (value) => Array.isArray(value)
  ? value.map(stableValue)
  : value && typeof value === "object"
    ? Object.fromEntries(Object.keys(value).sort().map((key) => [key, stableValue(value[key])]))
    : value;
const stableSha256 = (value) => sha256(JSON.stringify(stableValue(value)));
const arrayBuffer = (bytes) => bytes.buffer.slice(bytes.byteOffset, bytes.byteOffset + bytes.byteLength);

try {
  const sourcePath = path.join(root, "web/protocol/glb-import.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, []);
  const modulePath = path.join(temporary, "glb-import.mjs");
  fs.writeFileSync(modulePath, transpiled.outputText);
  const protocol = await import(pathToFileURL(modulePath));
  const fixtures = JSON.parse(fs.readFileSync(fixtureReportPath, "utf8")).fixtures;
  const comparisons = fixtures.map((fixture) => {
    const bytes = fs.readFileSync(path.join(fixtureRoot, fixture.file));
    assert.equal(sha256(bytes), fixture.sha256, `${fixture.id} source SHA-256`);
    const imported = protocol.importGLBDesktopFixtureSemantics(arrayBuffer(bytes));
    const comparison = protocol.compareGLBDesktopFixtureSemantics(fixture.semantic, imported);
    const primitives = imported.meshes.flatMap((mesh) => mesh.primitives);
    return {
      id: fixture.id,
      file: fixture.file,
      sourceSha256: fixture.sha256,
      byteLength: bytes.byteLength,
      desktopSemanticSha256: stableSha256(fixture.semantic),
      webSemanticSha256: stableSha256(imported),
      compatible: comparison.compatible,
      mismatchCount: comparison.mismatches.length,
      topology: {
        meshCount: imported.meshes.length,
        primitiveCount: primitives.length,
        indexCount: primitives.reduce((sum, primitive) => sum + (primitive.indices?.count ?? 0), 0),
        modes: [...new Set(primitives.map((primitive) => primitive.mode))].sort((left, right) => left - right),
      },
      attributes: [...new Set(primitives.flatMap((primitive) => Object.keys(primitive.attributes)))].sort(),
      materials: {
        count: imported.materials.length,
        pbrCount: imported.materials.filter((material) => material.pbr.metallicFactor !== null && material.pbr.roughnessFactor !== null).length,
        texturedCount: imported.materials.filter((material) => material.pbr.baseColorTexture !== null).length,
      },
      nodes: {
        count: imported.nodes.length,
        namedCount: imported.nodes.filter((node) => node.name !== null).length,
        hierarchyEdges: imported.nodes.reduce((sum, node) => sum + node.children.length, 0),
        skinnedCount: imported.nodes.filter((node) => node.skin !== null).length,
      },
      animations: {
        count: imported.animations.length,
        channelPaths: imported.animations.flatMap((animation) => animation.channels.map((channel) => channel.target.path)).sort(),
        sampleCounts: imported.animations.flatMap((animation) => animation.samplers.map((sampler) => sampler.input?.count ?? 0)),
      },
    };
  });
  const report = {
    schemaVersion: 1,
    task: "M12-06B",
    operation: "WEB_GLB_IMPORT_SEMANTIC_COMPARISON",
    parentManifestSha256: sha256(fs.readFileSync(parentManifestPath)),
    fixtureReportSha256: sha256(fs.readFileSync(fixtureReportPath)),
    fixtureCount: comparisons.length,
    comparedDomains: ["topology", "attributes", "materials", "nodes", "animations"],
    allCompatible: comparisons.every((comparison) => comparison.compatible && comparison.mismatchCount === 0),
    comparisons,
    routeState: "BLOCKED_UNTIL_MAIN_PERSISTENCE",
    nextTask: "M12-06C",
  };
  fs.mkdirSync(path.dirname(outputPath), { recursive: true });
  fs.writeFileSync(outputPath, JSON.stringify(report, null, 2) + "\n");
  process.stdout.write(`glb-desktop-import-report-generated fixtures=${report.fixtureCount} domains=${report.comparedDomains.length} compatible=${report.allCompatible} next=${report.nextTask}\n`);
}
finally {
  fs.rmSync(temporary, { recursive: true, force: true });
}