import crypto from "node:crypto";
import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { spawnSync } from "node:child_process";
import { expect, test } from "@playwright/test";

const root = path.resolve(import.meta.dirname, "../../..");
const source = fs.readFileSync(path.join(root, "tests/files/web/m12_stl_capability_v1/capability-binary.stl"));
const reportPath = path.join(root, "tests/golden/M12-07F/web-roundtrip-report.json");
const sha256 = (bytes: Uint8Array | Buffer) => crypto.createHash("sha256").update(bytes).digest("hex");

test("M12-07F round-trips Web STL through desktop Blender with material loss report", async ({ page }) => {
  await page.goto("/");
  const result = await page.evaluate(async (bytes) => new Promise<any>((resolve, reject) => {
    const worker = new Worker("/src/workers/stl-roundtrip-test.worker.ts", { type: "module" });
    worker.onmessage = (event: MessageEvent<any>) => { worker.terminate(); resolve({ ...event.data, output: event.data.output ? Array.from(new Uint8Array(event.data.output)) : null }); };
    worker.onerror = (event) => { worker.terminate(); reject(new Error(event.message)); };
    const input = Uint8Array.from(bytes).buffer;
    worker.postMessage({ bytes: input, unitScale: 1, sourceMaterialCount: 2 }, [input]);
  }), Array.from(source));
  expect(result.ok).toBe(true);
  expect(result.lossReport).toEqual({
    schemaVersion: 1,
    operation: "STL_EXPORT_LOSS_REPORT",
    canRoundTrip: true,
    warningCount: 1,
    warnings: [{ code: "STL_MATERIAL_UNSUPPORTED", severity: "warning", message: "STL has no material slots; 2 source material assignments are omitted" }],
  });
  const temporary = fs.mkdtempSync(path.join(os.tmpdir(), "m12-07f-stl-"));
  try {
    const outputPath = path.join(temporary, "web-output.stl");
    fs.writeFileSync(outputPath, Buffer.from(result.output));
    const desktopPath = path.join(temporary, "desktop-report.json");
    const blender = process.env.BLENDER_BIN ?? path.join(root, "build_blender_5.2.0/bin/blender");
    const command = spawnSync(blender, ["-b", "--factory-startup", "--python", path.join(root, "tools/web/check-stl-web-roundtrip.py"), "--", outputPath, desktopPath], { cwd: root, encoding: "utf8", maxBuffer: 20 * 1024 * 1024 });
    expect(command.status, `${command.stdout}\n${command.stderr}`).toBe(0);
    const desktop = JSON.parse(JSON.stringify(JSON.parse(fs.readFileSync(desktopPath, "utf8"))));
    const report = {
      schemaVersion: 1,
      task: "M12-07F",
      operation: "WEB_STL_TO_DESKTOP_ROUNDTRIP",
      source: { sha256: sha256(source), bytes: source.byteLength },
      browser: { imported: result.imported, outputSha256: sha256(Buffer.from(result.output)), outputBytes: result.output.length, lossReport: result.lossReport },
      desktop,
      comparison: {
        triangleCountExact: result.imported.triangleCount === desktop.triangleCount,
        normalExact: JSON.stringify(result.imported.normals) === JSON.stringify(desktop.polygonNormals),
        materialLossExplicit: result.lossReport.warnings[0]?.code === "STL_MATERIAL_UNSUPPORTED",
      },
      nextTask: "M12-07G",
    };
    if (process.env.UPDATE_STL_ROUNDTRIP_REPORT === "1") {
      fs.mkdirSync(path.dirname(reportPath), { recursive: true });
      fs.writeFileSync(reportPath, JSON.stringify(report, null, 2) + "\n");
    }
    expect(report).toEqual(JSON.parse(fs.readFileSync(reportPath, "utf8")));
    expect(report.comparison).toEqual({ triangleCountExact: true, normalExact: true, materialLossExplicit: true });
  }
  finally {
    fs.rmSync(temporary, { recursive: true, force: true });
  }
});