import { ConnectableObservable, isObservable, of, Subject } from 'rxjs';
import * as i0 from '@angular/core';
import { Injectable, InjectionToken } from '@angular/core';

class DataSource {
}
/** Checks whether an object is a data source. */
function isDataSource(value) {
    // Check if the value is a DataSource by observing if it has a connect function. Cannot
    // be checked as an `instanceof DataSource` since people could create their own sources
    // that match the interface, but don't extend DataSource. We also can't use `isObservable`
    // here, because of some internal apps.
    return value && typeof value.connect === 'function' && !(value instanceof ConnectableObservable);
}

/** DataSource wrapper for a native array. */
class ArrayDataSource extends DataSource {
    constructor(_data) {
        super();
        this._data = _data;
    }
    connect() {
        return isObservable(this._data) ? this._data : of(this._data);
    }
    disconnect() { }
}

/**
 * A repeater that destroys views when they are removed from a
 * {@link ViewContainerRef}. When new items are inserted into the container,
 * the repeater will always construct a new embedded view for each item.
 *
 * @template T The type for the embedded view's $implicit property.
 * @template R The type for the item in each IterableDiffer change record.
 * @template C The type for the context passed to each embedded view.
 */
class _DisposeViewRepeaterStrategy {
    applyChanges(changes, viewContainerRef, itemContextFactory, itemValueResolver, itemViewChanged) {
        changes.forEachOperation((record, adjustedPreviousIndex, currentIndex) => {
            let view;
            let operation;
            if (record.previousIndex == null) {
                const insertContext = itemContextFactory(record, adjustedPreviousIndex, currentIndex);
                view = viewContainerRef.createEmbeddedView(insertContext.templateRef, insertContext.context, insertContext.index);
                operation = 1 /* _ViewRepeaterOperation.INSERTED */;
            }
            else if (currentIndex == null) {
                viewContainerRef.remove(adjustedPreviousIndex);
                operation = 3 /* _ViewRepeaterOperation.REMOVED */;
            }
            else {
                view = viewContainerRef.get(adjustedPreviousIndex);
                viewContainerRef.move(view, currentIndex);
                operation = 2 /* _ViewRepeaterOperation.MOVED */;
            }
            if (itemViewChanged) {
                itemViewChanged({
                    context: view?.context,
                    operation,
                    record,
                });
            }
        });
    }
    detach() { }
}

/**
 * A repeater that caches views when they are removed from a
 * {@link ViewContainerRef}. When new items are inserted into the container,
 * the repeater will reuse one of the cached views instead of creating a new
 * embedded view. Recycling cached views reduces the quantity of expensive DOM
 * inserts.
 *
 * @template T The type for the embedded view's $implicit property.
 * @template R The type for the item in each IterableDiffer change record.
 * @template C The type for the context passed to each embedded view.
 */
class _RecycleViewRepeaterStrategy {
    constructor() {
        /**
         * The size of the cache used to store unused views.
         * Setting the cache size to `0` will disable caching. Defaults to 20 views.
         */
        this.viewCacheSize = 20;
        /**
         * View cache that stores embedded view instances that have been previously stamped out,
         * but don't are not currently rendered. The view repeater will reuse these views rather than
         * creating brand new ones.
         *
         * TODO(michaeljamesparsons) Investigate whether using a linked list would improve performance.
         */
        this._viewCache = [];
    }
    /** Apply changes to the DOM. */
    applyChanges(changes, viewContainerRef, itemContextFactory, itemValueResolver, itemViewChanged) {
        // Rearrange the views to put them in the right location.
        changes.forEachOperation((record, adjustedPreviousIndex, currentIndex) => {
            let view;
            let operation;
            if (record.previousIndex == null) {
                // Item added.
                const viewArgsFactory = () => itemContextFactory(record, adjustedPreviousIndex, currentIndex);
                view = this._insertView(viewArgsFactory, currentIndex, viewContainerRef, itemValueResolver(record));
                operation = view ? 1 /* _ViewRepeaterOperation.INSERTED */ : 0 /* _ViewRepeaterOperation.REPLACED */;
            }
            else if (currentIndex == null) {
                // Item removed.
                this._detachAndCacheView(adjustedPreviousIndex, viewContainerRef);
                operation = 3 /* _ViewRepeaterOperation.REMOVED */;
            }
            else {
                // Item moved.
                view = this._moveView(adjustedPreviousIndex, currentIndex, viewContainerRef, itemValueResolver(record));
                operation = 2 /* _ViewRepeaterOperation.MOVED */;
            }
            if (itemViewChanged) {
                itemViewChanged({
                    context: view?.context,
                    operation,
                    record,
                });
            }
        });
    }
    detach() {
        for (const view of this._viewCache) {
            view.destroy();
        }
        this._viewCache = [];
    }
    /**
     * Inserts a view for a new item, either from the cache or by creating a new
     * one. Returns `undefined` if the item was inserted into a cached view.
     */
    _insertView(viewArgsFactory, currentIndex, viewContainerRef, value) {
        const cachedView = this._insertViewFromCache(currentIndex, viewContainerRef);
        if (cachedView) {
            cachedView.context.$implicit = value;
            return undefined;
        }
        const viewArgs = viewArgsFactory();
        return viewContainerRef.createEmbeddedView(viewArgs.templateRef, viewArgs.context, viewArgs.index);
    }
    /** Detaches the view at the given index and inserts into the view cache. */
    _detachAndCacheView(index, viewContainerRef) {
        const detachedView = viewContainerRef.detach(index);
        this._maybeCacheView(detachedView, viewContainerRef);
    }
    /** Moves view at the previous index to the current index. */
    _moveView(adjustedPreviousIndex, currentIndex, viewContainerRef, value) {
        const view = viewContainerRef.get(adjustedPreviousIndex);
        viewContainerRef.move(view, currentIndex);
        view.context.$implicit = value;
        return view;
    }
    /**
     * Cache the given detached view. If the cache is full, the view will be
     * destroyed.
     */
    _maybeCacheView(view, viewContainerRef) {
        if (this._viewCache.length < this.viewCacheSize) {
            this._viewCache.push(view);
        }
        else {
            const index = viewContainerRef.indexOf(view);
            // The host component could remove views from the container outside of
            // the view repeater. It's unlikely this will occur, but just in case,
            // destroy the view on its own, otherwise destroy it through the
            // container to ensure that all the references are removed.
            if (index === -1) {
                view.destroy();
            }
            else {
                viewContainerRef.remove(index);
            }
        }
    }
    /** Inserts a recycled view from the cache at the given index. */
    _insertViewFromCache(index, viewContainerRef) {
        const cachedView = this._viewCache.pop();
        if (cachedView) {
            viewContainerRef.insert(cachedView, index);
        }
        return cachedView || null;
    }
}

/**
 * Class to be used to power selecting one or more options from a list.
 */
class SelectionModel {
    /** Selected values. */
    get selected() {
        if (!this._selected) {
            this._selected = Array.from(this._selection.values());
        }
        return this._selected;
    }
    constructor(_multiple = false, initiallySelectedValues, _emitChanges = true, compareWith) {
        this._multiple = _multiple;
        this._emitChanges = _emitChanges;
        this.compareWith = compareWith;
        /** Currently-selected values. */
        this._selection = new Set();
        /** Keeps track of the deselected options that haven't been emitted by the change event. */
        this._deselectedToEmit = [];
        /** Keeps track of the selected options that haven't been emitted by the change event. */
        this._selectedToEmit = [];
        /** Event emitted when the value has changed. */
        this.changed = new Subject();
        if (initiallySelectedValues && initiallySelectedValues.length) {
            if (_multiple) {
                initiallySelectedValues.forEach(value => this._markSelected(value));
            }
            else {
                this._markSelected(initiallySelectedValues[0]);
            }
            // Clear the array in order to avoid firing the change event for preselected values.
            this._selectedToEmit.length = 0;
        }
    }
    /**
     * Selects a value or an array of values.
     * @param values The values to select
     * @return Whether the selection changed as a result of this call
     * @breaking-change 16.0.0 make return type boolean
     */
    select(...values) {
        this._verifyValueAssignment(values);
        values.forEach(value => this._markSelected(value));
        const changed = this._hasQueuedChanges();
        this._emitChangeEvent();
        return changed;
    }
    /**
     * Deselects a value or an array of values.
     * @param values The values to deselect
     * @return Whether the selection changed as a result of this call
     * @breaking-change 16.0.0 make return type boolean
     */
    deselect(...values) {
        this._verifyValueAssignment(values);
        values.forEach(value => this._unmarkSelected(value));
        const changed = this._hasQueuedChanges();
        this._emitChangeEvent();
        return changed;
    }
    /**
     * Sets the selected values
     * @param values The new selected values
     * @return Whether the selection changed as a result of this call
     * @breaking-change 16.0.0 make return type boolean
     */
    setSelection(...values) {
        this._verifyValueAssignment(values);
        const oldValues = this.selected;
        const newSelectedSet = new Set(values);
        values.forEach(value => this._markSelected(value));
        oldValues
            .filter(value => !newSelectedSet.has(value))
            .forEach(value => this._unmarkSelected(value));
        const changed = this._hasQueuedChanges();
        this._emitChangeEvent();
        return changed;
    }
    /**
     * Toggles a value between selected and deselected.
     * @param value The value to toggle
     * @return Whether the selection changed as a result of this call
     * @breaking-change 16.0.0 make return type boolean
     */
    toggle(value) {
        return this.isSelected(value) ? this.deselect(value) : this.select(value);
    }
    /**
     * Clears all of the selected values.
     * @param flushEvent Whether to flush the changes in an event.
     *   If false, the changes to the selection will be flushed along with the next event.
     * @return Whether the selection changed as a result of this call
     * @breaking-change 16.0.0 make return type boolean
     */
    clear(flushEvent = true) {
        this._unmarkAll();
        const changed = this._hasQueuedChanges();
        if (flushEvent) {
            this._emitChangeEvent();
        }
        return changed;
    }
    /**
     * Determines whether a value is selected.
     */
    isSelected(value) {
        return this._selection.has(this._getConcreteValue(value));
    }
    /**
     * Determines whether the model does not have a value.
     */
    isEmpty() {
        return this._selection.size === 0;
    }
    /**
     * Determines whether the model has a value.
     */
    hasValue() {
        return !this.isEmpty();
    }
    /**
     * Sorts the selected values based on a predicate function.
     */
    sort(predicate) {
        if (this._multiple && this.selected) {
            this._selected.sort(predicate);
        }
    }
    /**
     * Gets whether multiple values can be selected.
     */
    isMultipleSelection() {
        return this._multiple;
    }
    /** Emits a change event and clears the records of selected and deselected values. */
    _emitChangeEvent() {
        // Clear the selected values so they can be re-cached.
        this._selected = null;
        if (this._selectedToEmit.length || this._deselectedToEmit.length) {
            this.changed.next({
                source: this,
                added: this._selectedToEmit,
                removed: this._deselectedToEmit,
            });
            this._deselectedToEmit = [];
            this._selectedToEmit = [];
        }
    }
    /** Selects a value. */
    _markSelected(value) {
        value = this._getConcreteValue(value);
        if (!this.isSelected(value)) {
            if (!this._multiple) {
                this._unmarkAll();
            }
            if (!this.isSelected(value)) {
                this._selection.add(value);
            }
            if (this._emitChanges) {
                this._selectedToEmit.push(value);
            }
        }
    }
    /** Deselects a value. */
    _unmarkSelected(value) {
        value = this._getConcreteValue(value);
        if (this.isSelected(value)) {
            this._selection.delete(value);
            if (this._emitChanges) {
                this._deselectedToEmit.push(value);
            }
        }
    }
    /** Clears out the selected values. */
    _unmarkAll() {
        if (!this.isEmpty()) {
            this._selection.forEach(value => this._unmarkSelected(value));
        }
    }
    /**
     * Verifies the value assignment and throws an error if the specified value array is
     * including multiple values while the selection model is not supporting multiple values.
     */
    _verifyValueAssignment(values) {
        if (values.length > 1 && !this._multiple && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throw getMultipleValuesInSingleSelectionError();
        }
    }
    /** Whether there are queued up change to be emitted. */
    _hasQueuedChanges() {
        return !!(this._deselectedToEmit.length || this._selectedToEmit.length);
    }
    /** Returns a value that is comparable to inputValue by applying compareWith function, returns the same inputValue otherwise. */
    _getConcreteValue(inputValue) {
        if (!this.compareWith) {
            return inputValue;
        }
        else {
            for (let selectedValue of this._selection) {
                if (this.compareWith(inputValue, selectedValue)) {
                    return selectedValue;
                }
            }
            return inputValue;
        }
    }
}
/**
 * Returns an error that reports that multiple values are passed into a selection model
 * with a single value.
 * @docs-private
 */
function getMultipleValuesInSingleSelectionError() {
    return Error('Cannot pass multiple values into SelectionModel with single-value mode.');
}

/**
 * Class to coordinate unique selection based on name.
 * Intended to be consumed as an Angular service.
 * This service is needed because native radio change events are only fired on the item currently
 * being selected, and we still need to uncheck the previous selection.
 *
 * This service does not *store* any IDs and names because they may change at any time, so it is
 * less error-prone if they are simply passed through when the events occur.
 */
class UniqueSelectionDispatcher {
    constructor() {
        this._listeners = [];
    }
    /**
     * Notify other items that selection for the given name has been set.
     * @param id ID of the item.
     * @param name Name of the item.
     */
    notify(id, name) {
        for (let listener of this._listeners) {
            listener(id, name);
        }
    }
    /**
     * Listen for future changes to item selection.
     * @return Function used to deregister listener
     */
    listen(listener) {
        this._listeners.push(listener);
        return () => {
            this._listeners = this._listeners.filter((registered) => {
                return listener !== registered;
            });
        };
    }
    ngOnDestroy() {
        this._listeners = [];
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: UniqueSelectionDispatcher, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
    static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: UniqueSelectionDispatcher, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: UniqueSelectionDispatcher, decorators: [{
            type: Injectable,
            args: [{ providedIn: 'root' }]
        }] });

/**
 * Injection token for {@link _ViewRepeater}. This token is for use by Angular Material only.
 * @docs-private
 */
const _VIEW_REPEATER_STRATEGY = new InjectionToken('_ViewRepeater');

/**
 * Generated bundle index. Do not edit.
 */

export { ArrayDataSource, DataSource, SelectionModel, UniqueSelectionDispatcher, _DisposeViewRepeaterStrategy, _RecycleViewRepeaterStrategy, _VIEW_REPEATER_STRATEGY, getMultipleValuesInSingleSelectionError, isDataSource };
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