import {
  CollectionEventType_default,
  Collection_default
} from "./chunk-F6XZ22ZQ.js";
import {
  Base_default
} from "./chunk-S5OMZ56B.js";
import {
  getIntersection
} from "./chunk-CKDBVGKM.js";
import {
  assert
} from "./chunk-QFCIXVZ3.js";
import {
  ObjectEventType_default,
  getUid
} from "./chunk-H47PV7W6.js";
import {
  EventType_default,
  Event_default,
  listen,
  unlistenByKey
} from "./chunk-KJXIHBKT.js";
import {
  clear
} from "./chunk-5RHQVMYD.js";

// node_modules/ol/layer/Group.js
var GroupEvent = class extends Event_default {
  /**
   * @param {GroupEventType} type The event type.
   * @param {BaseLayer} layer The layer.
   */
  constructor(type, layer) {
    super(type);
    this.layer = layer;
  }
};
var Property = {
  LAYERS: "layers"
};
var LayerGroup = class _LayerGroup extends Base_default {
  /**
   * @param {Options} [options] Layer options.
   */
  constructor(options) {
    options = options || {};
    const baseOptions = (
      /** @type {Options} */
      Object.assign({}, options)
    );
    delete baseOptions.layers;
    let layers = options.layers;
    super(baseOptions);
    this.on;
    this.once;
    this.un;
    this.layersListenerKeys_ = [];
    this.listenerKeys_ = {};
    this.addChangeListener(Property.LAYERS, this.handleLayersChanged_);
    if (layers) {
      if (Array.isArray(layers)) {
        layers = new Collection_default(layers.slice(), { unique: true });
      } else {
        assert(
          typeof /** @type {?} */
          layers.getArray === "function",
          "Expected `layers` to be an array or a `Collection`"
        );
      }
    } else {
      layers = new Collection_default(void 0, { unique: true });
    }
    this.setLayers(layers);
  }
  /**
   * @private
   */
  handleLayerChange_() {
    this.changed();
  }
  /**
   * @private
   */
  handleLayersChanged_() {
    this.layersListenerKeys_.forEach(unlistenByKey);
    this.layersListenerKeys_.length = 0;
    const layers = this.getLayers();
    this.layersListenerKeys_.push(
      listen(layers, CollectionEventType_default.ADD, this.handleLayersAdd_, this),
      listen(
        layers,
        CollectionEventType_default.REMOVE,
        this.handleLayersRemove_,
        this
      )
    );
    for (const id in this.listenerKeys_) {
      this.listenerKeys_[id].forEach(unlistenByKey);
    }
    clear(this.listenerKeys_);
    const layersArray = layers.getArray();
    for (let i = 0, ii = layersArray.length; i < ii; i++) {
      const layer = layersArray[i];
      this.registerLayerListeners_(layer);
      this.dispatchEvent(new GroupEvent("addlayer", layer));
    }
    this.changed();
  }
  /**
   * @param {BaseLayer} layer The layer.
   */
  registerLayerListeners_(layer) {
    const listenerKeys = [
      listen(
        layer,
        ObjectEventType_default.PROPERTYCHANGE,
        this.handleLayerChange_,
        this
      ),
      listen(layer, EventType_default.CHANGE, this.handleLayerChange_, this)
    ];
    if (layer instanceof _LayerGroup) {
      listenerKeys.push(
        listen(layer, "addlayer", this.handleLayerGroupAdd_, this),
        listen(layer, "removelayer", this.handleLayerGroupRemove_, this)
      );
    }
    this.listenerKeys_[getUid(layer)] = listenerKeys;
  }
  /**
   * @param {GroupEvent} event The layer group event.
   */
  handleLayerGroupAdd_(event) {
    this.dispatchEvent(new GroupEvent("addlayer", event.layer));
  }
  /**
   * @param {GroupEvent} event The layer group event.
   */
  handleLayerGroupRemove_(event) {
    this.dispatchEvent(new GroupEvent("removelayer", event.layer));
  }
  /**
   * @param {import("../Collection.js").CollectionEvent<import("./Base.js").default>} collectionEvent CollectionEvent.
   * @private
   */
  handleLayersAdd_(collectionEvent) {
    const layer = collectionEvent.element;
    this.registerLayerListeners_(layer);
    this.dispatchEvent(new GroupEvent("addlayer", layer));
    this.changed();
  }
  /**
   * @param {import("../Collection.js").CollectionEvent<import("./Base.js").default>} collectionEvent CollectionEvent.
   * @private
   */
  handleLayersRemove_(collectionEvent) {
    const layer = collectionEvent.element;
    const key = getUid(layer);
    this.listenerKeys_[key].forEach(unlistenByKey);
    delete this.listenerKeys_[key];
    this.dispatchEvent(new GroupEvent("removelayer", layer));
    this.changed();
  }
  /**
   * Returns the {@link module:ol/Collection~Collection collection} of {@link module:ol/layer/Layer~Layer layers}
   * in this group.
   * @return {!Collection<import("./Base.js").default>} Collection of
   *   {@link module:ol/layer/Base~BaseLayer layers} that are part of this group.
   * @observable
   * @api
   */
  getLayers() {
    return (
      /** @type {!Collection<import("./Base.js").default>} */
      this.get(Property.LAYERS)
    );
  }
  /**
   * Set the {@link module:ol/Collection~Collection collection} of {@link module:ol/layer/Layer~Layer layers}
   * in this group.
   * @param {!Collection<import("./Base.js").default>} layers Collection of
   *   {@link module:ol/layer/Base~BaseLayer layers} that are part of this group.
   * @observable
   * @api
   */
  setLayers(layers) {
    const collection = this.getLayers();
    if (collection) {
      const currentLayers = collection.getArray();
      for (let i = 0, ii = currentLayers.length; i < ii; ++i) {
        this.dispatchEvent(new GroupEvent("removelayer", currentLayers[i]));
      }
    }
    this.set(Property.LAYERS, layers);
  }
  /**
   * @param {Array<import("./Layer.js").default>} [array] Array of layers (to be modified in place).
   * @return {Array<import("./Layer.js").default>} Array of layers.
   * @override
   */
  getLayersArray(array) {
    array = array !== void 0 ? array : [];
    this.getLayers().forEach(function(layer) {
      layer.getLayersArray(array);
    });
    return array;
  }
  /**
   * Get the layer states list and use this groups z-index as the default
   * for all layers in this and nested groups, if it is unset at this point.
   * If dest is not provided and this group's z-index is undefined
   * 0 is used a the default z-index.
   * @param {Array<import("./Layer.js").State>} [dest] Optional list
   * of layer states (to be modified in place).
   * @return {Array<import("./Layer.js").State>} List of layer states.
   * @override
   */
  getLayerStatesArray(dest) {
    const states = dest !== void 0 ? dest : [];
    const pos = states.length;
    this.getLayers().forEach(function(layer) {
      layer.getLayerStatesArray(states);
    });
    const ownLayerState = this.getLayerState();
    let defaultZIndex = ownLayerState.zIndex;
    if (!dest && ownLayerState.zIndex === void 0) {
      defaultZIndex = 0;
    }
    for (let i = pos, ii = states.length; i < ii; i++) {
      const layerState = states[i];
      layerState.opacity *= ownLayerState.opacity;
      layerState.visible = layerState.visible && ownLayerState.visible;
      layerState.maxResolution = Math.min(
        layerState.maxResolution,
        ownLayerState.maxResolution
      );
      layerState.minResolution = Math.max(
        layerState.minResolution,
        ownLayerState.minResolution
      );
      layerState.minZoom = Math.max(layerState.minZoom, ownLayerState.minZoom);
      layerState.maxZoom = Math.min(layerState.maxZoom, ownLayerState.maxZoom);
      if (ownLayerState.extent !== void 0) {
        if (layerState.extent !== void 0) {
          layerState.extent = getIntersection(
            layerState.extent,
            ownLayerState.extent
          );
        } else {
          layerState.extent = ownLayerState.extent;
        }
      }
      if (layerState.zIndex === void 0) {
        layerState.zIndex = defaultZIndex;
      }
    }
    return states;
  }
  /**
   * @return {import("../source/Source.js").State} Source state.
   * @override
   */
  getSourceState() {
    return "ready";
  }
};
var Group_default = LayerGroup;

export {
  GroupEvent,
  Group_default
};
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