import crypto from "node:crypto";
import fs from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";

const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), "../..");
const sourcePath = path.join(root, "tests/files/web/m12_stl_capability_v1/capability-binary.stl");
const outputRoot = path.join(root, "tests/files/web/m12_stl_edges_v1");
const reportPath = path.join(root, "tests/golden/M12-07E/edge-fixtures.json");
const sha256 = (bytes) => crypto.createHash("sha256").update(bytes).digest("hex");

fs.mkdirSync(outputRoot, { recursive: true });
fs.mkdirSync(path.dirname(reportPath), { recursive: true });
const source = fs.readFileSync(sourcePath);
if (source.length !== 184 || source.readUInt32LE(80) !== 2) throw new Error("M12-07D binary parent fixture drifted");
fs.writeFileSync(path.join(outputRoot, "capability-binary.stl"), source);
const degenerate = Buffer.from(source);
const firstVertex = Buffer.from(degenerate.subarray(84 + 12, 84 + 24));
firstVertex.copy(degenerate, 84 + 24);
firstVertex.copy(degenerate, 84 + 36);
const trailing = Buffer.concat([source, Buffer.from([0xde, 0xad, 0xbe, 0xef])]);
const outputs = [
  { id: "DEGENERATE_TRIANGLE", name: "degenerate-binary.stl", bytes: degenerate, expectedCode: "STL_DEGENERATE_TRIANGLE" },
  { id: "TRAILING_BYTES", name: "trailing-binary.stl", bytes: trailing, expectedCode: "STL_TRAILING_BYTES" },
];
for (const output of outputs) fs.writeFileSync(path.join(outputRoot, output.name), output.bytes);
const report = {
  schemaVersion: 1,
  task: "M12-07E",
  operation: "STL_EDGE_FIXTURE_GENERATION",
  parent: { path: "tests/files/web/m12_stl_capability_v1/capability-binary.stl", byteLength: source.length, sha256: sha256(source) },
  fixtures: outputs.map((output) => ({ id: output.id, file: output.name, byteLength: output.bytes.length, sha256: sha256(output.bytes), expectedCode: output.expectedCode })),
  nextTask: "M12-07F",
};
fs.writeFileSync(reportPath, JSON.stringify(report, null, 2) + "\n");
process.stdout.write(`stl-edge-fixtures-generated cases=${outputs.length} next=${report.nextTask}\n`);