import assert from "node:assert/strict";
import fs from "node:fs";
import path from "node:path";
import test from "node:test";
import ts from "typescript";

const repoRoot = path.resolve(import.meta.dirname, "../../..");
const sourcePath = path.join(repoRoot, "web/protocol/viewport-camera.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 moduleUrl = "data:text/javascript;base64," + Buffer.from(transpiled.outputText).toString("base64");
const { VIEWPORT_DEFAULT_ORBIT, applyOrbitDelta, cameraState, orbitPosition, orbitStateFromPosition } = await import(moduleUrl);

test("M7-15 main and Offscreen orbit camera contract is deterministic", () => {
  const position = orbitPosition(VIEWPORT_DEFAULT_ORBIT);
  assert.deepEqual(position.map((value) => Number(value.toFixed(6))), [4.219781, -4.219781, 3.658811]);
  const restored = orbitStateFromPosition(position);
  assert.ok(Math.abs(restored.yaw - VIEWPORT_DEFAULT_ORBIT.yaw) < 1e-12);
  assert.ok(Math.abs(restored.pitch - VIEWPORT_DEFAULT_ORBIT.pitch) < 1e-12);
  assert.ok(Math.abs(restored.distance - VIEWPORT_DEFAULT_ORBIT.distance) < 1e-12);
  assert.deepEqual(restored.target, [0, 0, 0]);
  const next = applyOrbitDelta({ ...VIEWPORT_DEFAULT_ORBIT, target: [0, 0, 0] }, 24, -12, 120);
  assert.equal(next.yaw, VIEWPORT_DEFAULT_ORBIT.yaw - 24 * 0.008);
  assert.equal(next.pitch, VIEWPORT_DEFAULT_ORBIT.pitch - 12 * 0.008);
  assert.equal(next.distance, VIEWPORT_DEFAULT_ORBIT.distance * Math.exp(0.12));
  assert.deepEqual(cameraState(next).position, orbitPosition(next));
});