/* 계획노선 편집 창 **가운데 단추 팬 튐**(401 · 요구 250-3) 단위검증 헬퍼 —
 * `_RouteEdit_Input.ts` 의 `bindRouteEditNavigation` 에 가짜 캔버스를 붙이고 포인터 · 휠 이벤트를
 * 흘려 보낸다. 회전은 진짜 `_RouteEdit_Rotate.ts` · 화면 셈은 진짜 B04 `metricToScreen`.
 * 판정 = 「잡은 땅 점이 손(커서)을 따라가나」 — 보이는 자리 = rerotate(metricToScreen(...)).
 */
const fs = require("fs");
const path = require("path");
const { makeLoader } = require("./helper_ts_stub_loader.cjs");

const ROOT = path.join(__dirname, "..", "..");

function memoryStorage() {
  const map = new Map();
  return {
    getItem: (key) => (map.has(key) ? map.get(key) : null),
    setItem: (key, value) => map.set(key, String(value)),
    removeItem: (key) => map.delete(key),
  };
}
globalThis.window = { localStorage: memoryStorage(), sessionStorage: memoryStorage() };
globalThis.localStorage = globalThis.window.localStorage;

const STUBS = { "@ui/ui_template_palette": { themeColor: (_name, fallback) => fallback } };

const { loadTs } = makeLoader({
  root: ROOT,
  requireFor: (full) => (request) => {
    if (STUBS[request]) return STUBS[request];
    if (request.startsWith(".")) return loadTs(path.join(path.dirname(full), `${request}.ts`));
    return require(request);
  },
});

const input = loadTs(path.join(ROOT, "B05_Profile", "B05_Profile_UI_RouteEdit_Input.ts"));
const rotateMod = loadTs(path.join(ROOT, "B05_Profile", "B05_Profile_UI_RouteEdit_Rotate.ts"));
const render = loadTs(path.join(ROOT, "B04_PreProcess", "B04_PreProcess_UI_MapRender.ts"));

const RECT = { left: 10, top: 20, width: 800, height: 600 };
const meta = { x_min: 0, y_min: 0, width_meters: 800, height_meters: 600 };
const W = [300, 250]; // 잡을 땅 점(m)

/** 창 하나 — 가짜 캔버스 · 진짜 회전 · 진짜 팬/휠. */
function rig(rotationDeg = 0) {
  const listeners = {};
  const canvas = {
    addEventListener: (type, fn) => (listeners[type] ??= []).push(fn),
    getBoundingClientRect: () => RECT,
    style: { cursor: "", removeProperty() {} },
    setPointerCapture() {},
  };
  let view = {
    width: RECT.width,
    height: RECT.height,
    scale: 1,
    offsetX: 0,
    offsetY: 0,
    mapRect: { x: 0, y: 0, width: RECT.width, height: RECT.height },
  };
  const rotation = rotateMod.createMapRotation({
    overlay: { querySelector: () => null },
    size: () => ({ width: RECT.width, height: RECT.height }),
    onChange: () => {},
  });
  rotation.set((rotationDeg * Math.PI) / 180);
  input.bindRouteEditNavigation({
    canvas,
    getView: () => view,
    setView: (next) => (view = next),
    getMeta: () => meta,
    unrotateDelta: rotation.unrotateDelta,
    rotateWheel: rotation.wheel,
    draw: () => {},
  });
  const fire = (type, event) =>
    (listeners[type] ?? []).forEach((fn) => fn({ preventDefault() {}, ...event }));
  /** 땅 점이 화면(client)에 보이는 자리. */
  const seen = ([x, y]) => {
    const [px, py] = rotation.rerotate(...render.metricToScreen(meta, view, x, y));
    return [px + RECT.left, py + RECT.top];
  };
  return { fire, seen, view: () => view };
}

const mouse = (x, y, extra = {}) => ({
  pointerId: 1,
  pointerType: "mouse",
  clientX: x,
  clientY: y,
  button: 1,
  buttons: 4,
  ...extra,
});
const gap = (a, b) => Math.hypot(a[0] - b[0], a[1] - b[1]);

/** 가운데 끌기 여러 걸음 — 걸음마다 잡은 점과 손의 거리 중 가장 큰 값. */
function dragFollows(rotationDeg) {
  const r = rig(rotationDeg);
  let [x, y] = r.seen(W);
  r.fire("pointerdown", mouse(x, y));
  let worst = 0;
  for (const [dx, dy] of [
    [40, 0],
    [0, -35],
    [-120, 80],
    [7, 3],
    [300, -200],
  ]) {
    x += dx;
    y += dy;
    r.fire("pointermove", mouse(x, y, { button: -1 }));
    worst = Math.max(worst, gap(r.seen(W), [x, y]));
  }
  r.fire("pointerup", mouse(x, y));
  return worst;
}

/** 끄는 중 휠 확대(커서 자리) 뒤 다시 끌기 — 잡은 점이 손 밑에 남나. */
function wheelMidDrag(rotationDeg) {
  const r = rig(rotationDeg);
  let [x, y] = r.seen(W);
  r.fire("pointerdown", mouse(x, y));
  x += 50;
  y += 20;
  r.fire("pointermove", mouse(x, y, { button: -1 }));
  r.fire("wheel", { clientX: x, clientY: y, deltaY: 100, deltaMode: 0, ctrlKey: false });
  r.fire("wheel", { clientX: x, clientY: y, deltaY: 100, deltaMode: 0, ctrlKey: false });
  const afterWheel = gap(r.seen(W), [x, y]);
  x += 30;
  y -= 60;
  r.fire("pointermove", mouse(x, y, { button: -1 }));
  return { afterWheel, afterMove: gap(r.seen(W), [x, y]), scale: r.view().scale };
}

/** 끄는 중 Ctrl+휠 회전 뒤 다시 끌기 — 땅 점이 손이 민 만큼(같은 방향 · 같은 길이) 움직이나. */
function rotateMidDrag() {
  const r = rig(15);
  let [x, y] = r.seen(W);
  r.fire("pointerdown", mouse(x, y));
  x += 20;
  r.fire("pointermove", mouse(x, y, { button: -1 }));
  r.fire("wheel", { clientX: x, clientY: y, deltaY: 100, deltaMode: 0, ctrlKey: true });
  const before = r.seen(W);
  x += 60;
  y += 45;
  r.fire("pointermove", mouse(x, y, { button: -1 }));
  const after = r.seen(W);
  return gap([after[0] - before[0], after[1] - before[1]], [60, 45]);
}

/** 창 밖에서 가운데 단추를 놓고 들어옴 — buttons 0 move 는 팬 끝 · 그 뒤 move 는 화면 그대로. */
function releasedOutside() {
  const r = rig(15);
  const [x, y] = r.seen(W);
  r.fire("pointerdown", mouse(x, y));
  r.fire("pointermove", mouse(x + 30, y, { button: -1 }));
  const held = { ...r.view() };
  r.fire("pointermove", mouse(x + 400, y + 300, { button: -1, buttons: 0 }));
  r.fire("pointermove", mouse(x + 10, y + 10, { button: -1, buttons: 0 }));
  const lost = rig(0);
  lost.fire("pointerdown", mouse(x, y));
  lost.fire("lostpointercapture", mouse(x, y));
  const lostBefore = { ...lost.view() };
  lost.fire("pointermove", mouse(x + 90, y, { button: -1 }));
  return {
    moved: Math.hypot(r.view().offsetX - held.offsetX, r.view().offsetY - held.offsetY),
    lostMoved: Math.hypot(
      lost.view().offsetX - lostBefore.offsetX,
      lost.view().offsetY - lostBefore.offsetY,
    ),
  };
}

/** 손가락 둘 — 둘째 손가락이 팬을 넘겨받지 않음 · 첫 손가락은 계속 따라감. */
function secondTouch() {
  const r = rig(0);
  let [x, y] = r.seen(W);
  const touch = (id, px, py) => ({
    pointerId: id,
    pointerType: "touch",
    clientX: px,
    clientY: py,
    button: 0,
    buttons: 1,
  });
  r.fire("pointerdown", touch(1, x, y));
  r.fire("pointerdown", touch(2, x + 200, y + 100));
  r.fire("pointermove", touch(2, x + 260, y + 130));
  x += 25;
  y += 15;
  r.fire("pointermove", touch(1, x, y));
  return gap(r.seen(W), [x, y]);
}

/** 왼쪽 단추(편집 창) — 팬 안 함. */
function leftDoesNotPan() {
  const r = rig(0);
  const [x, y] = r.seen(W);
  r.fire("pointerdown", mouse(x, y, { button: 0, buttons: 1 }));
  r.fire("pointermove", mouse(x + 80, y + 40, { button: -1, buttons: 1 }));
  return Math.hypot(r.view().offsetX, r.view().offsetY);
}

process.stdout.write(
  JSON.stringify({
    follow0: dragFollows(0),
    follow15: dragFollows(15),
    wheel0: wheelMidDrag(0),
    wheel15: wheelMidDrag(15),
    rotateMid: rotateMidDrag(),
    outside: releasedOutside(),
    secondTouch: secondTouch(),
    leftPan: leftDoesNotPan(),
  }),
);