text: /**
   * @module ol/layer/Base
   */
  import BaseObject from '../Object.js';
  import LayerProperty from './Property.js';
  import {abstract} from '../util.js';
  import {assert} from '../asserts.js';
  import {assign} from '../obj.js';
  import {clamp} from '../math.js';
  
  /**
   * @typedef {import("../ObjectEventType").Types|'change:extent'|'change:maxResolution'|'change:maxZoom'|
   *    'change:minResolution'|'change:minZoom'|'change:opacity'|'change:visible'|'change:zIndex'} BaseLayerObjectEventTypes
   */
  
  /***
   * @template Return
   * @typedef {import("../Observable").OnSignature<import("../Observable").EventTypes, import("../events/Event.js").default, Return> &
   *   import("../Observable").OnSignature<BaseLayerObjectEventTypes, import("../Object").ObjectEvent, Return> &
   *   import("../Observable").CombinedOnSignature<import("../Observable").EventTypes|BaseLayerObjectEventTypes, Return>} BaseLayerOnSignature
   */
  
  /**
   * @typedef {Object} Options
   * @property {string} [className='ol-layer'] A CSS class name to set to the layer element.
   * @property {number} [opacity=1] Opacity (0, 1).
   * @property {boolean} [visible=true] Visibility.
   * @property {import("../extent.js").Extent} [extent] The bounding extent for layer rendering.  The layer will not be
   * rendered outside of this extent.
   * @property {number} [zIndex] The z-index for layer rendering.  At rendering time, the layers
   * will be ordered, first by Z-index and then by position. When `undefined`, a `zIndex` of 0 is assumed
   * for layers that are added to the map's `layers` collection, or `Infinity` when the layer's `setMap()`
   * method was used.
   * @property {number} [minResolution] The minimum resolution (inclusive) at which this layer will be
   * visible.
   * @property {number} [maxResolution] The maximum resolution (exclusive) below which this layer will
   * be visible.
   * @property {number} [minZoom] The minimum view zoom level (exclusive) above which this layer will be
   * visible.
   * @property {number} [maxZoom] The maximum view zoom level (inclusive) at which this layer will
   * be visible.
   * @property {Object<string, *>} [properties] Arbitrary observable properties. Can be accessed with `#get()` and `#set()`.
   */
  
  /**
   * @classdesc
   * Abstract base class; normally only used for creating subclasses and not
   * instantiated in apps.
   * Note that with {@link module:ol/layer/Base} and all its subclasses, any property set in
   * the options is set as a {@link module:ol/Object} property on the layer object, so
   * is observable, and has get/set accessors.
   *
   * @api
   */
  class BaseLayer extends BaseObject {
    /**
     * @param {Options} options Layer options.
     */
    constructor(options) {
      super();
  
      /***
       * @type {BaseLayerOnSignature<import("../Observable.js").OnReturn>}
       */
      this.on;
  
      /***
       * @type {BaseLayerOnSignature<import("../Observable.js").OnReturn>}
       */
      this.once;
  
      /***
       * @type {BaseLayerOnSignature<void>}
       */
      this.un;
  
      /**
       * @type {Object<string, *>}
       */
      const properties = assign({}, options);
      if (typeof options.properties === 'object') {
        delete properties.properties;
        assign(properties, options.properties);
      }
  
      properties[LayerProperty.OPACITY] =
        options.opacity !== undefined ? options.opacity : 1;
      assert(typeof properties[LayerProperty.OPACITY] === 'number', 64); // Layer opacity must be a number
  
      properties[LayerProperty.VISIBLE] =
        options.visible !== undefined ? options.visible : true;
      properties[LayerProperty.Z_INDEX] = options.zIndex;
      properties[LayerProperty.MAX_RESOLUTION] =
        options.maxResolution !== undefined ? options.maxResolution : Infinity;
      properties[LayerProperty.MIN_RESOLUTION] =
        options.minResolution !== undefined ? options.minResolution : 0;
      properties[LayerProperty.MIN_ZOOM] =
        options.minZoom !== undefined ? options.minZoom : -Infinity;
      properties[LayerProperty.MAX_ZOOM] =
        options.maxZoom !== undefined ? options.maxZoom : Infinity;
  
      /**
       * @type {string}
       * @private
       */
      this.className_ =
        properties.className !== undefined ? options.className : 'ol-layer';
      delete properties.className;
  
      this.setProperties(properties);
  
      /**
       * @type {import("./Layer.js").State}
       * @private
       */
      this.state_ = null;
    }
  
    /**
     * @return {string} CSS class name.
     */
    getClassName() {
      return this.className_;
    }
  
    /**
     * This method is not meant to be called by layers or layer renderers because the state
     * is incorrect if the layer is included in a layer group.
     *
     * @param {boolean} [opt_managed] Layer is managed.
     * @return {import("./Layer.js").State} Layer state.
     */
    getLayerState(opt_managed) {
      /** @type {import("./Layer.js").State} */
      const state =
        this.state_ ||
        /** @type {?} */ ({
          layer: this,
          managed: opt_managed === undefined ? true : opt_managed,
        });
      const zIndex = this.getZIndex();
      state.opacity = clamp(Math.round(this.getOpacity() * 100) / 100, 0, 1);
      state.sourceState = this.getSourceState();
      state.visible = this.getVisible();
      state.extent = this.getExtent();
      state.zIndex = zIndex === undefined && !state.managed ? Infinity : zIndex;
      state.maxResolution = this.getMaxResolution();
      state.minResolution = Math.max(this.getMinResolution(), 0);
      state.minZoom = this.getMinZoom();
      state.maxZoom = this.getMaxZoom();
      this.state_ = state;
  
      return state;
    }
  
    /**
     * @abstract
     * @param {Array<import("./Layer.js").default>} [opt_array] Array of layers (to be
     *     modified in place).
     * @return {Array<import("./Layer.js").default>} Array of layers.
     */
    getLayersArray(opt_array) {
      return abstract();
    }
  
    /**
     * @abstract
     * @param {Array<import("./Layer.js").State>} [opt_states] Optional list of layer
     *     states (to be modified in place).
     * @return {Array<import("./Layer.js").State>} List of layer states.
     */
    getLayerStatesArray(opt_states) {
      return abstract();
    }
  
    /**
     * Return the {@link module:ol/extent~Extent extent} of the layer or `undefined` if it
     * will be visible regardless of extent.
     * @return {import("../extent.js").Extent|undefined} The layer extent.
     * @observable
     * @api
     */
    getExtent() {
      return /** @type {import("../extent.js").Extent|undefined} */ (
        this.get(LayerProperty.EXTENT)
      );
    }
  
    /**
     * Return the maximum resolution of the layer.
     * @return {number} The maximum resolution of the layer.
     * @observable
     * @api
     */
    getMaxResolution() {
      return /** @type {number} */ (this.get(LayerProperty.MAX_RESOLUTION));
    }
  
    /**
     * Return the minimum resolution of the layer.
     * @return {number} The minimum resolution of the layer.
     * @observable
     * @api
     */
    getMinResolution() {
      return /** @type {number} */ (this.get(LayerProperty.MIN_RESOLUTION));
    }
  
    /**
     * Return the minimum zoom level of the layer.
     * @return {number} The minimum zoom level of the layer.
     * @observable
     * @api
     */
    getMinZoom() {
      return /** @type {number} */ (this.get(LayerProperty.MIN_ZOOM));
    }
  
    /**
     * Return the maximum zoom level of the layer.
     * @return {number} The maximum zoom level of the layer.
     * @observable
     * @api
     */
    getMaxZoom() {
      return /** @type {number} */ (this.get(LayerProperty.MAX_ZOOM));
    }
  
    /**
     * Return the opacity of the layer (between 0 and 1).
     * @return {number} The opacity of the layer.
     * @observable
     * @api
     */
    getOpacity() {
      return /** @type {number} */ (this.get(LayerProperty.OPACITY));
    }
  
    /**
     * @abstract
     * @return {import("../source/State.js").default} Source state.
     */
    getSourceState() {
      return abstract();
    }
  
    /**
     * Return the visibility of the layer (`true` or `false`).
     * @return {boolean} The visibility of the layer.
     * @observable
     * @api
     */
    getVisible() {
      return /** @type {boolean} */ (this.get(LayerProperty.VISIBLE));
    }
  
    /**
     * Return the Z-index of the layer, which is used to order layers before
     * rendering. The default Z-index is 0.
     * @return {number} The Z-index of the layer.
     * @observable
     * @api
     */
    getZIndex() {
      return /** @type {number} */ (this.get(LayerProperty.Z_INDEX));
    }
  
    /**
     * Set the extent at which the layer is visible.  If `undefined`, the layer
     * will be visible at all extents.
     * @param {import("../extent.js").Extent|undefined} extent The extent of the layer.
     * @observable
     * @api
     */
    setExtent(extent) {
      this.set(LayerProperty.EXTENT, extent);
    }
  
    /**
     * Set the maximum resolution at which the layer is visible.
     * @param {number} maxResolution The maximum resolution of the layer.
     * @observable
     * @api
     */
    setMaxResolution(maxResolution) {
      this.set(LayerProperty.MAX_RESOLUTION, maxResolution);
    }
  
    /**
     * Set the minimum resolution at which the layer is visible.
     * @param {number} minResolution The minimum resolution of the layer.
     * @observable
     * @api
     */
    setMinResolution(minResolution) {
      this.set(LayerProperty.MIN_RESOLUTION, minResolution);
    }
  
    /**
     * Set the maximum zoom (exclusive) at which the layer is visible.
     * Note that the zoom levels for layer visibility are based on the
     * view zoom level, which may be different from a tile source zoom level.
     * @param {number} maxZoom The maximum zoom of the layer.
     * @observable
     * @api
     */
    setMaxZoom(maxZoom) {
      this.set(LayerProperty.MAX_ZOOM, maxZoom);
    }
  
    /**
     * Set the minimum zoom (inclusive) at which the layer is visible.
     * Note that the zoom levels for layer visibility are based on the
     * view zoom level, which may be different from a tile source zoom level.
     * @param {number} minZoom The minimum zoom of the layer.
     * @observable
     * @api
     */
    setMinZoom(minZoom) {
      this.set(LayerProperty.MIN_ZOOM, minZoom);
    }
  
    /**
     * Set the opacity of the layer, allowed values range from 0 to 1.
     * @param {number} opacity The opacity of the layer.
     * @observable
     * @api
     */
    setOpacity(opacity) {
      assert(typeof opacity === 'number', 64); // Layer opacity must be a number
      this.set(LayerProperty.OPACITY, opacity);
    }
  
    /**
     * Set the visibility of the layer (`true` or `false`).
     * @param {boolean} visible The visibility of the layer.
     * @observable
     * @api
     */
    setVisible(visible) {
      this.set(LayerProperty.VISIBLE, visible);
    }
  
    /**
     * Set Z-index of the layer, which is used to order layers before rendering.
     * The default Z-index is 0.
     * @param {number} zindex The z-index of the layer.
     * @observable
     * @api
     */
    setZIndex(zindex) {
      this.set(LayerProperty.Z_INDEX, zindex);
    }
  
    /**
     * Clean up.
     */
    disposeInternal() {
      if (this.state_) {
        this.state_.layer = null;
        this.state_ = null;
      }
      super.disposeInternal();
    }
  }
  
  export default BaseLayer;
  