import { downloadJson, readJsonFile } from "/packages/contracts/io.js";
import { validateArrayDefinition } from "/packages/contracts/validation.js";
import { createSplitPane } from "/packages/ui/split-pane.js";
import { createArrayCanvas } from "./canvas-view.js";
import {
  addMicrophone,
  arrayGeometryIssues,
  arrayStatistics,
  centerMicrophones,
  clampPositionToAperture,
  createArrayDefinition,
  fitApertureToMicrophones,
  inferApertureShape,
  moveMicrophone,
  prepareArrayForEditing,
  removeMicrophone,
  replaceMicrophonesWithPreset,
  safeArrayFileStem,
  snapPosition,
  updateMicrophone,
} from "./model.js";

const byId = (id) => {
  const element = document.getElementById(id);
  if (!element) throw new Error("필수 UI를 찾을 수 없습니다: #" + id);
  return element;
};

const maybeById = (id) => document.getElementById(id);
const requiredIds = [
  "array-builder-layout", "array-builder-controls", "array-builder-workspace",
  "array-builder-split-handle", "array-input", "export-button", "array-id",
  "array-name", "array-description", "aperture-width", "aperture-height",
  "aperture-shape", "preset-type", "preset-count", "preset-columns",
  "preset-rows", "preset-seed", "preset-minimum-spacing",
  "generate-preset-button", "array-canvas", "select-tool-button",
  "add-tool-button", "fit-view-button", "zoom-in-button", "zoom-out-button",
  "snap-enabled", "snap-step", "microphone-list", "microphone-id",
  "microphone-x", "microphone-y", "microphone-z", "add-microphone-button",
  "remove-microphone-button", "validation-title", "validation-message",
];
const elements = Object.fromEntries(requiredIds.map((id) => [id, byId(id)]));

const optionalIds = [
  "validation-dot", "save-state", "undo-button", "redo-button",
  "microphone-count", "minimum-spacing", "array-centroid", "calibration-count",
  "selection-status", "center-microphones-button", "fit-aperture-button",
  "clamp-microphones-button", "move-microphone-up-button",
  "move-microphone-down-button", "microphone-sensitivity", "microphone-phase",
  "frequency-response-summary", "preset-axis", "preset-edge-inset",
  "microphone-search", "microphone-selection-empty", "microphone-fields",
  "workspace-summary",
];
for (const id of optionalIds) elements[id] = maybeById(id);
elements.validationCard = elements["validation-title"].closest(".validation-card");

const splitPane = createSplitPane({
  container: elements["array-builder-layout"],
  separator: elements["array-builder-split-handle"],
  panel: elements["array-builder-controls"],
  panelSide: "start",
  storageKey: "micarrsim.array-builder.control-panel-width",
  defaultSize: 420,
  minSize: 360,
  maxSize: 720,
  minMainSize: 560,
  enabledMediaQuery: "(min-width: 1101px)",
});

const state = {
  arrayDefinition: createArrayDefinition(),
  apertureShape: "rectangle",
  selectedMicrophoneId: "mic-001",
  tool: "select",
  snapEnabled: true,
  snapStepM: 0.005,
  dirty: false,
  validationRevision: 0,
  valid: false,
  history: [],
  future: [],
  dragSnapshot: null,
};

const MAX_HISTORY = 50;
const BUILTIN_ARRAY_IDS = new Set([
  "rectangular-2x2", "rectangular-4x3", "rectangular-8x6",
  "rectangular-16x12", "rectangular-24x16", "rectangular-16x12-compact",
  "rectangular-16x12-large", "fermat-spiral-192",
]);

function finiteInput(element, label, options = {}) {
  const value = element.valueAsNumber;
  if (!Number.isFinite(value)) throw new Error(label + "에 유한한 숫자를 입력하세요.");
  if (options.minimum !== undefined && value < options.minimum) {
    throw new Error(label + "은(는) " + options.minimum + " 이상이어야 합니다.");
  }
  if (options.exclusiveMinimum !== undefined && value <= options.exclusiveMinimum) {
    throw new Error(label + "은(는) " + options.exclusiveMinimum + "보다 커야 합니다.");
  }
  if (options.maximum !== undefined && value > options.maximum) {
    throw new Error(label + "은(는) " + options.maximum + " 이하여야 합니다.");
  }
  return value;
}

function integerInput(element, label, minimum, maximum) {
  const value = finiteInput(element, label, { minimum, maximum });
  if (!Number.isInteger(value)) throw new Error(label + "은(는) 정수여야 합니다.");
  return value;
}

function setNumber(element, value) {
  if (!element) return;
  element.value = Number.isFinite(value) ? String(value) : "";
}

function selectedMicrophone() {
  return state.arrayDefinition.microphones.find(
    (microphone) => microphone.id === state.selectedMicrophoneId,
  ) ?? null;
}

function captureSnapshot() {
  return {
    arrayDefinition: structuredClone(state.arrayDefinition),
    apertureShape: state.apertureShape,
    selectedMicrophoneId: state.selectedMicrophoneId,
  };
}

function snapshotSignature(snapshot) {
  return JSON.stringify(snapshot);
}

function restoreSnapshot(snapshot, message) {
  state.arrayDefinition = structuredClone(snapshot.arrayDefinition);
  state.apertureShape = snapshot.apertureShape;
  state.selectedMicrophoneId = snapshot.selectedMicrophoneId;
  if (!selectedMicrophone()) {
    state.selectedMicrophoneId = state.arrayDefinition.microphones[0]?.id ?? null;
  }
  state.dirty = true;
  renderAll(message);
}

function recordSnapshot(before, label) {
  if (snapshotSignature(before) === snapshotSignature(captureSnapshot())) return false;
  state.history.push({ snapshot: before, label });
  if (state.history.length > MAX_HISTORY) state.history.shift();
  state.future.length = 0;
  state.dirty = true;
  return true;
}

function mutate(label, callback) {
  const before = captureSnapshot();
  callback();
  if (recordSnapshot(before, label)) renderAll(label);
  else renderAll();
}

function showActionError(error) {
  const message = error instanceof Error ? error.message : String(error);
  if (elements["save-state"]) elements["save-state"].textContent = "적용하지 못함";
  elements["validation-title"].textContent = "작업을 적용하지 못했습니다";
  elements["validation-message"].textContent = message;
  if (elements.validationCard) elements.validationCard.dataset.severity = "error";
  elements["array-builder-workspace"].dataset.actionError = message;
}

function safely(callback) {
  try {
    delete elements["array-builder-workspace"].dataset.actionError;
    callback();
  } catch (error) {
    showActionError(error);
  }
}

function announce(message) {
  if (elements["save-state"]) {
    elements["save-state"].textContent = state.dirty ? message || "저장하지 않은 변경" : message || "저장됨";
    elements["save-state"].classList.toggle("is-dirty", state.dirty);
  }
  if (elements["selection-status"] && message) {
    elements["selection-status"].textContent = message;
  }
}

function setTool(tool, options = {}) {
  state.tool = tool === "add" ? "add" : "select";
  elements["select-tool-button"].classList.toggle("is-active", state.tool === "select");
  elements["add-tool-button"].classList.toggle("is-active", state.tool === "add");
  elements["select-tool-button"].setAttribute("aria-pressed", String(state.tool === "select"));
  elements["add-tool-button"].setAttribute("aria-pressed", String(state.tool === "add"));
  elements["array-canvas"].dataset.tool = state.tool;
  canvasView.render(canvasState());
  if (options.focus) canvasView.focus();
}

function canvasState() {
  return {
    arrayDefinition: state.arrayDefinition,
    apertureShape: state.apertureShape,
    selectedMicrophoneId: state.selectedMicrophoneId,
    tool: state.tool,
    snapStepM: state.snapEnabled ? state.snapStepM : 0,
  };
}

function normalizedPointerPosition(position) {
  if (state.snapEnabled) {
    return snapPosition(
      position,
      state.snapStepM,
      state.arrayDefinition.aperture,
      state.apertureShape,
    );
  }
  return clampPositionToAperture(
    position,
    state.arrayDefinition.aperture,
    state.apertureShape,
  );
}

function coordinateKey(position) {
  return position.map((value) => Number(value).toFixed(9)).join(",");
}

function availableManualPosition() {
  const used = new Set(state.arrayDefinition.microphones.map(
    (microphone) => coordinateKey(microphone.position),
  ));
  const origin = [0, 0, 0];
  if (!used.has(coordinateKey(origin))) return origin;
  const step = Math.max(state.snapStepM, 0.001);
  for (let ring = 1; ring <= 128; ring += 1) {
    const samples = Math.max(8, ring * 8);
    for (let index = 0; index < samples; index += 1) {
      const angle = (index / samples) * Math.PI * 2;
      const candidate = normalizedPointerPosition([
        Math.cos(angle) * ring * step,
        Math.sin(angle) * ring * step,
        0,
      ]);
      if (!used.has(coordinateKey(candidate))) return candidate;
    }
  }
  throw new Error("빈 위치를 자동으로 찾지 못했습니다. 추가 도구로 canvas의 위치를 지정하세요.");
}

function selectMicrophone(id, options = {}) {
  state.selectedMicrophoneId = state.arrayDefinition.microphones.some(
    (microphone) => microphone.id === id,
  ) ? id : null;
  renderMicrophoneList();
  syncSelectedEditor();
  canvasView.render(canvasState());
  if (state.selectedMicrophoneId) announce(state.selectedMicrophoneId + " 선택");
  if (options.focusCanvas) canvasView.focus();
}

const canvasView = createArrayCanvas(elements["array-canvas"], {
  onSelect(id) {
    selectMicrophone(id);
  },
  onAdd(position) {
    safely(() => mutate("마이크 추가됨", () => {
      const microphone = addMicrophone(
        state.arrayDefinition,
        normalizedPointerPosition(position),
      );
      state.selectedMicrophoneId = microphone.id;
    }));
  },
  onDragStart(id) {
    if (state.dragSnapshot) return;
    state.selectedMicrophoneId = id;
    state.dragSnapshot = captureSnapshot();
    syncSelectedEditor();
  },
  onDrag(id, position) {
    updateMicrophone(state.arrayDefinition, id, {
      position: normalizedPointerPosition(position),
    });
    state.selectedMicrophoneId = id;
    syncSelectedEditor();
    canvasView.render(canvasState());
  },
  onDragEnd(id, position) {
    if (!state.dragSnapshot) return;
    if (position) {
      updateMicrophone(state.arrayDefinition, id, {
        position: normalizedPointerPosition(position),
      });
    }
    const before = state.dragSnapshot;
    state.dragSnapshot = null;
    if (recordSnapshot(before, "마이크 위치 변경됨")) renderAll("마이크 위치 변경됨");
    else renderAll();
  },
  onDelete() {
    removeSelectedMicrophone();
  },
  onNudge(delta) {
    const microphone = selectedMicrophone();
    if (!microphone) return;
    safely(() => mutate("마이크 위치 변경됨", () => {
      const dx = Number.isFinite(delta?.dx) ? delta.dx : 0;
      const dy = Number.isFinite(delta?.dy) ? delta.dy : 0;
      updateMicrophone(state.arrayDefinition, microphone.id, {
        position: normalizedPointerPosition([
          microphone.position[0] + dx,
          microphone.position[1] + dy,
          microphone.position[2],
        ]),
      });
    }));
  },
  onToolChange(tool) {
    setTool(tool);
  },
  onFit() {
    canvasView.fit();
  },
});

function renderDocumentEditor() {
  elements["array-id"].value = state.arrayDefinition.id;
  elements["array-name"].value = state.arrayDefinition.name;
  elements["array-description"].value = state.arrayDefinition.description ?? "";
  setNumber(elements["aperture-width"], state.arrayDefinition.aperture.width);
  setNumber(elements["aperture-height"], state.arrayDefinition.aperture.height);
  elements["aperture-shape"].value = state.apertureShape;
}

function formatCoordinate(value) {
  const rounded = Math.abs(value) < 0.0000000005 ? 0 : value;
  return Number(rounded).toFixed(4);
}

function renderStatistics() {
  const statistics = arrayStatistics(state.arrayDefinition);
  if (elements["workspace-summary"]) {
    elements["workspace-summary"].textContent =
      formatCoordinate(state.arrayDefinition.aperture.width) + " × " +
      formatCoordinate(state.arrayDefinition.aperture.height) + " m · " +
      String(statistics.count) + " channels";
  }
  if (elements["microphone-count"]) {
    elements["microphone-count"].textContent = String(statistics.count) + " ch";
  }
  if (elements["minimum-spacing"]) {
    elements["minimum-spacing"].textContent = statistics.minimumSpacing === null
      ? "—"
      : (statistics.minimumSpacing * 1000).toFixed(2) + " mm";
  }
  if (elements["array-centroid"]) {
    elements["array-centroid"].textContent =
      statistics.centroid.map(formatCoordinate).join(", ") + " m";
  }
  if (elements["calibration-count"]) {
    elements["calibration-count"].textContent =
      String(statistics.calibrationCount) + " / " + String(statistics.count);
  }
}

function renderMicrophoneList() {
  const list = elements["microphone-list"];
  const query = elements["microphone-search"]?.value.trim().toLowerCase() ?? "";
  list.replaceChildren();
  state.arrayDefinition.microphones.forEach((microphone, index) => {
    if (query && !microphone.id.toLowerCase().includes(query)) return;
    const button = document.createElement("button");
    button.type = "button";
    button.className = "microphone-row";
    button.dataset.microphoneId = microphone.id;
    button.setAttribute("role", "option");
    button.setAttribute(
      "aria-selected",
      String(microphone.id === state.selectedMicrophoneId),
    );
    button.setAttribute(
      "aria-current",
      String(microphone.id === state.selectedMicrophoneId),
    );
    button.classList.toggle("is-selected", microphone.id === state.selectedMicrophoneId);

    const channel = document.createElement("span");
    channel.className = "microphone-row__channel";
    channel.textContent = String(index + 1);
    const identity = document.createElement("span");
    identity.className = "microphone-row__identity";
    const strong = document.createElement("strong");
    strong.textContent = microphone.id;
    const coordinates = document.createElement("small");
    coordinates.textContent =
      "x " + formatCoordinate(microphone.position[0]) +
      " · y " + formatCoordinate(microphone.position[1]) +
      " · z " + formatCoordinate(microphone.position[2]);
    identity.append(strong, coordinates);
    if (
      microphone.sensitivityDb !== undefined ||
      microphone.phaseOffsetDeg !== undefined ||
      microphone.frequencyResponse !== undefined
    ) {
      const calibration = document.createElement("span");
      calibration.className = "microphone-row__calibration";
      calibration.textContent = "cal";
      identity.append(calibration);
    }
    button.append(channel, identity);
    button.addEventListener("click", () => selectMicrophone(microphone.id));
    list.append(button);
  });
  if (!list.childElementCount) {
    const empty = document.createElement("p");
    empty.className = "microphone-list__empty";
    empty.textContent = query ? "검색 결과가 없습니다." : "마이크가 없습니다.";
    list.append(empty);
  }
}

function syncSelectedEditor() {
  const microphone = selectedMicrophone();
  const inputs = [
    elements["microphone-id"], elements["microphone-x"],
    elements["microphone-y"], elements["microphone-z"],
    elements["microphone-sensitivity"], elements["microphone-phase"],
  ].filter(Boolean);
  for (const input of inputs) input.disabled = !microphone;
  elements["microphone-selection-empty"]?.classList.toggle("is-hidden", Boolean(microphone));
  elements["microphone-fields"]?.classList.toggle("is-disabled", !microphone);
  elements["remove-microphone-button"].disabled =
    !microphone || state.arrayDefinition.microphones.length <= 1;

  if (!microphone) {
    for (const input of inputs) input.value = "";
    if (elements["frequency-response-summary"]) {
      elements["frequency-response-summary"].textContent = "선택한 마이크가 없습니다.";
    }
    return;
  }

  elements["microphone-id"].value = microphone.id;
  setNumber(elements["microphone-x"], microphone.position[0]);
  setNumber(elements["microphone-y"], microphone.position[1]);
  setNumber(elements["microphone-z"], microphone.position[2]);
  if (elements["microphone-sensitivity"]) {
    setNumber(elements["microphone-sensitivity"], microphone.sensitivityDb);
  }
  if (elements["microphone-phase"]) {
    setNumber(elements["microphone-phase"], microphone.phaseOffsetDeg);
  }
  if (elements["frequency-response-summary"]) {
    const count = microphone.frequencyResponse?.length ?? 0;
    elements["frequency-response-summary"].textContent = count > 0
      ? String(count) + "개 주파수 응답점 보존 중"
      : "주파수 응답점 없음";
  }
  const index = state.arrayDefinition.microphones.indexOf(microphone);
  if (elements["move-microphone-up-button"]) {
    elements["move-microphone-up-button"].disabled = index <= 0;
  }
  if (elements["move-microphone-down-button"]) {
    elements["move-microphone-down-button"].disabled =
      index < 0 || index >= state.arrayDefinition.microphones.length - 1;
  }
}

function syncPresetControls() {
  const type = elements["preset-type"].value;
  const grid = type === "grid";
  const random = type === "random";
  const linear = type === "linear";
  for (const element of [elements["preset-columns"], elements["preset-rows"]]) {
    element.closest(".field")?.toggleAttribute("hidden", !grid);
  }
  elements["preset-count"].closest(".field")?.toggleAttribute("hidden", grid);
  elements["preset-seed"].closest(".field")?.toggleAttribute("hidden", !random);
  elements["preset-minimum-spacing"].closest(".field")?.toggleAttribute("hidden", !random);
  elements["preset-axis"]?.closest(".field")?.toggleAttribute("hidden", !linear);
}

function syncHistoryButtons() {
  if (elements["undo-button"]) {
    elements["undo-button"].disabled = state.history.length === 0;
    elements["undo-button"].title = state.history.length
      ? "실행 취소: " + state.history.at(-1).label
      : "실행 취소할 작업이 없습니다.";
  }
  if (elements["redo-button"]) {
    elements["redo-button"].disabled = state.future.length === 0;
    elements["redo-button"].title = state.future.length
      ? "다시 실행: " + state.future.at(-1).label
      : "다시 실행할 작업이 없습니다.";
  }
}

async function validateCurrent() {
  const revision = ++state.validationRevision;
  const structuralIssues = await validateArrayDefinition(state.arrayDefinition);
  if (revision !== state.validationRevision) return;
  const geometryIssues = arrayGeometryIssues(state.arrayDefinition, {
    shape: state.apertureShape,
  });
  const errors = [
    ...structuralIssues.map((issue) => ({ ...issue, severity: "error" })),
    ...geometryIssues.filter((issue) => issue.severity === "error"),
  ];
  const warnings = geometryIssues.filter((issue) => issue.severity === "warning");
  if (BUILTIN_ARRAY_IDS.has(state.arrayDefinition.id)) {
    warnings.push({
      severity: "warning",
      path: "$.id",
      message: "내장 배열과 같은 ID입니다. 사용자 배열을 구분하려면 다른 ID를 권장합니다.",
    });
  }
  state.valid = errors.length === 0;
  document.documentElement.dataset.arrayValid = String(state.valid);
  elements["export-button"].disabled = !state.valid;
  elements.validationCard?.setAttribute(
    "data-severity",
    errors.length ? "error" : warnings.length ? "warning" : "success",
  );
  elements.validationCard?.classList.toggle("is-invalid", errors.length > 0);
  elements.validationCard?.classList.toggle("is-warning", errors.length === 0 && warnings.length > 0);
  elements.validationCard?.classList.toggle("is-valid", errors.length === 0 && warnings.length === 0);
  if (elements["validation-dot"]) {
    elements["validation-dot"].dataset.severity =
      errors.length ? "error" : warnings.length ? "warning" : "success";
  }

  if (errors.length) {
    elements["validation-title"].textContent = String(errors.length) + "개 오류 · 저장 불가";
    elements["validation-message"].textContent = errors
      .slice(0, 3)
      .map((issue) => issue.path + ": " + issue.message)
      .join(" · ");
  } else if (warnings.length) {
    elements["validation-title"].textContent = "저장 가능 · " + String(warnings.length) + "개 확인";
    elements["validation-message"].textContent = warnings
      .slice(0, 3)
      .map((issue) => issue.message)
      .join(" · ");
  } else {
    elements["validation-title"].textContent = "Array JSON 저장 가능";
    elements["validation-message"].textContent =
      String(state.arrayDefinition.microphones.length) +
      "개 채널과 표준 좌표 계약을 만족합니다.";
  }
}

function scheduleValidation() {
  const requestedRevision = ++state.validationRevision;
  queueMicrotask(async () => {
    if (requestedRevision !== state.validationRevision) return;
    state.validationRevision -= 1;
    await validateCurrent();
  });
}

function renderAll(message) {
  renderDocumentEditor();
  renderStatistics();
  renderMicrophoneList();
  syncSelectedEditor();
  syncPresetControls();
  syncHistoryButtons();
  setTool(state.tool);
  canvasView.render(canvasState());
  announce(message);
  scheduleValidation();
}

function removeSelectedMicrophone() {
  const microphone = selectedMicrophone();
  if (!microphone) return;
  safely(() => mutate("마이크 삭제됨", () => {
    const index = state.arrayDefinition.microphones.indexOf(microphone);
    if (!removeMicrophone(state.arrayDefinition, microphone.id)) {
      throw new Error("Array에는 최소 한 개의 마이크가 필요합니다.");
    }
    state.selectedMicrophoneId =
      state.arrayDefinition.microphones[Math.min(index, state.arrayDefinition.microphones.length - 1)]?.id ??
      null;
  }));
}

function applySelectedPosition() {
  const microphone = selectedMicrophone();
  if (!microphone) return;
  const position = [
    finiteInput(elements["microphone-x"], "x 좌표"),
    finiteInput(elements["microphone-y"], "y 좌표"),
    finiteInput(elements["microphone-z"], "z 좌표"),
  ];
  mutate("마이크 좌표 변경됨", () => {
    updateMicrophone(state.arrayDefinition, microphone.id, { position });
  });
}

function presetOptions() {
  return {
    type: elements["preset-type"].value,
    aperture: state.arrayDefinition.aperture,
    shape: state.apertureShape,
    count: integerInput(elements["preset-count"], "마이크 수", 1, 1024),
    columns: integerInput(elements["preset-columns"], "Columns", 1, 1024),
    rows: integerInput(elements["preset-rows"], "Rows", 1, 1024),
    seed: integerInput(elements["preset-seed"], "Seed", -2147483648, 4294967295),
    minimumSpacingM: finiteInput(
      elements["preset-minimum-spacing"],
      "최소 간격",
      { minimum: 0 },
    ),
    edgeInsetM: elements["preset-edge-inset"]
      ? finiteInput(elements["preset-edge-inset"], "경계 여백", { minimum: 0 })
      : 0,
    axis: elements["preset-axis"]?.value ?? "x",
  };
}

elements["array-id"].addEventListener("change", () => safely(() => {
  const value = elements["array-id"].value.trim();
  mutate("Array ID 변경됨", () => {
    state.arrayDefinition.id = value;
  });
}));
elements["array-name"].addEventListener("change", () => safely(() => {
  mutate("배열 이름 변경됨", () => {
    state.arrayDefinition.name = elements["array-name"].value.trim();
  });
}));
elements["array-description"].addEventListener("change", () => safely(() => {
  mutate("설명 변경됨", () => {
    const value = elements["array-description"].value.trim();
    if (value) state.arrayDefinition.description = value;
    else delete state.arrayDefinition.description;
  });
}));

for (const [id, property] of [
  ["aperture-width", "width"],
  ["aperture-height", "height"],
]) {
  elements[id].addEventListener("change", () => safely(() => {
    const value = finiteInput(elements[id], "Aperture " + property, {
      exclusiveMinimum: 0,
      maximum: 20,
    });
    mutate("Aperture 크기 변경됨", () => {
      state.arrayDefinition.aperture[property] = value;
    });
  }));
}

elements["aperture-shape"].addEventListener("change", () => safely(() => {
  mutate("생성 영역 형상 변경됨", () => {
    state.apertureShape = elements["aperture-shape"].value === "ellipse"
      ? "ellipse"
      : "rectangle";
  });
}));

elements["preset-type"].addEventListener("change", syncPresetControls);
elements["generate-preset-button"].addEventListener("click", () => safely(() => {
  const options = presetOptions();
  const calibrationCount = arrayStatistics(state.arrayDefinition).calibrationCount;
  mutate("Preset 배열 생성됨", () => {
    replaceMicrophonesWithPreset(state.arrayDefinition, options);
    state.selectedMicrophoneId = state.arrayDefinition.microphones[0]?.id ?? null;
  });
  announce(
    calibrationCount > 0
      ? "Preset 생성됨 · 기존 calibration은 Undo로 복구할 수 있습니다."
      : "Preset 배열 생성됨",
  );
}));

elements["select-tool-button"].addEventListener("click", () => setTool("select", { focus: true }));
elements["add-tool-button"].addEventListener("click", () => setTool("add", { focus: true }));
elements["fit-view-button"].addEventListener("click", () => canvasView.fit());
elements["zoom-in-button"].addEventListener("click", () => canvasView.zoomBy(1.25));
elements["zoom-out-button"].addEventListener("click", () => canvasView.zoomBy(0.8));
elements["snap-enabled"].addEventListener("change", () => {
  state.snapEnabled = elements["snap-enabled"].checked;
  canvasView.render(canvasState());
  announce(state.snapEnabled ? "Snap 켜짐" : "Snap 꺼짐");
});
elements["snap-step"].addEventListener("change", () => safely(() => {
  const millimeters = finiteInput(elements["snap-step"], "Snap 간격", {
    exclusiveMinimum: 0,
    maximum: 10000,
  });
  state.snapStepM = millimeters / 1000;
  canvasView.render(canvasState());
  announce("Snap " + String(millimeters) + " mm");
}));

elements["add-microphone-button"].addEventListener("click", () => safely(() => {
  mutate("마이크 추가됨", () => {
    const microphone = addMicrophone(state.arrayDefinition, availableManualPosition());
    state.selectedMicrophoneId = microphone.id;
  });
}));
elements["remove-microphone-button"].addEventListener("click", removeSelectedMicrophone);
elements["microphone-id"].addEventListener("change", () => safely(() => {
  const microphone = selectedMicrophone();
  if (!microphone) return;
  const previousId = microphone.id;
  const nextId = elements["microphone-id"].value.trim();
  mutate("마이크 ID 변경됨", () => {
    updateMicrophone(state.arrayDefinition, previousId, { id: nextId });
    state.selectedMicrophoneId = nextId;
  });
}));
for (const id of ["microphone-x", "microphone-y", "microphone-z"]) {
  elements[id].addEventListener("change", () => safely(applySelectedPosition));
}

if (elements["microphone-sensitivity"]) {
  elements["microphone-sensitivity"].addEventListener("change", () => safely(() => {
    const microphone = selectedMicrophone();
    if (!microphone) return;
    const value = elements["microphone-sensitivity"].value.trim() === ""
      ? null
      : finiteInput(elements["microphone-sensitivity"], "Sensitivity", {
        minimum: -120,
        maximum: 120,
      });
    mutate("Sensitivity 변경됨", () => {
      updateMicrophone(state.arrayDefinition, microphone.id, { sensitivityDb: value });
    });
  }));
}
if (elements["microphone-phase"]) {
  elements["microphone-phase"].addEventListener("change", () => safely(() => {
    const microphone = selectedMicrophone();
    if (!microphone) return;
    const value = elements["microphone-phase"].value.trim() === ""
      ? null
      : finiteInput(elements["microphone-phase"], "Phase offset", {
        minimum: -180,
        maximum: 180,
      });
    mutate("Phase offset 변경됨", () => {
      updateMicrophone(state.arrayDefinition, microphone.id, { phaseOffsetDeg: value });
    });
  }));
}

elements["move-microphone-up-button"]?.addEventListener("click", () => safely(() => {
  const microphone = selectedMicrophone();
  if (!microphone) return;
  mutate("채널 순서 변경됨", () => moveMicrophone(state.arrayDefinition, microphone.id, -1));
}));
elements["move-microphone-down-button"]?.addEventListener("click", () => safely(() => {
  const microphone = selectedMicrophone();
  if (!microphone) return;
  mutate("채널 순서 변경됨", () => moveMicrophone(state.arrayDefinition, microphone.id, 1));
}));
elements["microphone-search"]?.addEventListener("input", renderMicrophoneList);

elements["center-microphones-button"]?.addEventListener("click", () => safely(() => {
  mutate("마이크 중심 정렬됨", () => centerMicrophones(state.arrayDefinition));
}));
elements["fit-aperture-button"]?.addEventListener("click", () => safely(() => {
  mutate("Aperture를 마이크 범위에 맞춤", () => fitApertureToMicrophones(
    state.arrayDefinition,
    { shape: state.apertureShape, paddingM: 0.005 },
  ));
  canvasView.fit();
}));
elements["clamp-microphones-button"]?.addEventListener("click", () => safely(() => {
  mutate("마이크를 생성 경계 안으로 제한", () => {
    for (const microphone of state.arrayDefinition.microphones) {
      microphone.position = clampPositionToAperture(
        microphone.position,
        state.arrayDefinition.aperture,
        state.apertureShape,
      );
    }
  });
}));

function undo() {
  const entry = state.history.pop();
  if (!entry) return;
  state.future.push({ snapshot: captureSnapshot(), label: entry.label });
  restoreSnapshot(entry.snapshot, "실행 취소 · " + entry.label);
}

function redo() {
  const entry = state.future.pop();
  if (!entry) return;
  state.history.push({ snapshot: captureSnapshot(), label: entry.label });
  restoreSnapshot(entry.snapshot, "다시 실행 · " + entry.label);
}

elements["undo-button"]?.addEventListener("click", undo);
elements["redo-button"]?.addEventListener("click", redo);

window.addEventListener("keydown", (event) => {
  if (!(event.ctrlKey || event.metaKey) || event.altKey) return;
  const target = event.target;
  if (
    target instanceof HTMLInputElement ||
    target instanceof HTMLTextAreaElement ||
    target instanceof HTMLSelectElement ||
    target?.isContentEditable
  ) return;
  if (event.key.toLowerCase() !== "z") return;
  event.preventDefault();
  if (event.shiftKey) redo();
  else undo();
});

elements["array-input"].addEventListener("change", async () => {
  const file = elements["array-input"].files?.[0];
  if (!file) return;
  try {
    const value = await readJsonFile(file);
    const issues = await validateArrayDefinition(value);
    if (issues.length) {
      const details = issues.slice(0, 4).map(
        (issue) => issue.path + ": " + issue.message,
      ).join(" · ");
      throw new Error("Array JSON 계약을 만족하지 않습니다. " + details);
    }
    state.arrayDefinition = prepareArrayForEditing(value);
    state.apertureShape = inferApertureShape(value);
    state.selectedMicrophoneId = state.arrayDefinition.microphones[0]?.id ?? null;
    state.history.length = 0;
    state.future.length = 0;
    state.dirty = false;
    canvasView.fit();
    renderAll(file.name + " 불러옴");
  } catch (error) {
    showActionError(error);
  } finally {
    elements["array-input"].value = "";
  }
});

elements["export-button"].addEventListener("click", async () => {
  await validateCurrent();
  if (!state.valid) {
    showActionError(new Error("오류를 해결한 뒤 Array JSON을 저장하세요."));
    return;
  }
  downloadJson(
    state.arrayDefinition,
    safeArrayFileStem(state.arrayDefinition) + ".array.json",
  );
  state.dirty = false;
  announce("Array JSON 저장됨");
});

window.addEventListener("beforeunload", (event) => {
  if (!state.dirty) return;
  event.preventDefault();
  event.returnValue = "";
});
window.addEventListener("unload", () => {
  splitPane.destroy();
  canvasView.destroy();
});

elements["snap-enabled"].checked = state.snapEnabled;
setNumber(elements["snap-step"], state.snapStepM * 1000);
renderAll("기본 4×3 배열");
canvasView.fit();
document.documentElement.dataset.appReady = "true";