/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import { Injectable, Optional, SkipSelf } from '@angular/core';
import { DateAdapter } from '@angular/material/core';
import { Subject } from 'rxjs';
/** A class representing a range of dates. */
export class DateRange {
    constructor(
    /** The start date of the range. */
    start, 
    /** The end date of the range. */
    end) {
        this.start = start;
        this.end = end;
    }
}
/**
 * A selection model containing a date selection.
 * @docs-private
 */
export class MatDateSelectionModel {
    constructor(
    /** The current selection. */
    selection, _adapter) {
        this.selection = selection;
        this._adapter = _adapter;
        this._selectionChanged = new Subject();
        /** Emits when the selection has changed. */
        this.selectionChanged = this._selectionChanged;
        this.selection = selection;
    }
    /**
     * Updates the current selection in the model.
     * @param value New selection that should be assigned.
     * @param source Object that triggered the selection change.
     */
    updateSelection(value, source) {
        const oldValue = this.selection;
        this.selection = value;
        this._selectionChanged.next({ selection: value, source, oldValue });
    }
    ngOnDestroy() {
        this._selectionChanged.complete();
    }
    _isValidDateInstance(date) {
        return this._adapter.isDateInstance(date) && this._adapter.isValid(date);
    }
}
MatDateSelectionModel.decorators = [
    { type: Injectable }
];
MatDateSelectionModel.ctorParameters = () => [
    { type: undefined },
    { type: DateAdapter }
];
/**
 * A selection model that contains a single date.
 * @docs-private
 */
export class MatSingleDateSelectionModel extends MatDateSelectionModel {
    constructor(adapter) {
        super(null, adapter);
    }
    /**
     * Adds a date to the current selection. In the case of a single date selection, the added date
     * simply overwrites the previous selection
     */
    add(date) {
        super.updateSelection(date, this);
    }
    /** Checks whether the current selection is valid. */
    isValid() {
        return this.selection != null && this._isValidDateInstance(this.selection);
    }
    /**
     * Checks whether the current selection is complete. In the case of a single date selection, this
     * is true if the current selection is not null.
     */
    isComplete() {
        return this.selection != null;
    }
    /** Clones the selection model. */
    clone() {
        const clone = new MatSingleDateSelectionModel(this._adapter);
        clone.updateSelection(this.selection, this);
        return clone;
    }
}
MatSingleDateSelectionModel.decorators = [
    { type: Injectable }
];
MatSingleDateSelectionModel.ctorParameters = () => [
    { type: DateAdapter }
];
/**
 * A selection model that contains a date range.
 * @docs-private
 */
export class MatRangeDateSelectionModel extends MatDateSelectionModel {
    constructor(adapter) {
        super(new DateRange(null, null), adapter);
    }
    /**
     * Adds a date to the current selection. In the case of a date range selection, the added date
     * fills in the next `null` value in the range. If both the start and the end already have a date,
     * the selection is reset so that the given date is the new `start` and the `end` is null.
     */
    add(date) {
        let { start, end } = this.selection;
        if (start == null) {
            start = date;
        }
        else if (end == null) {
            end = date;
        }
        else {
            start = date;
            end = null;
        }
        super.updateSelection(new DateRange(start, end), this);
    }
    /** Checks whether the current selection is valid. */
    isValid() {
        const { start, end } = this.selection;
        // Empty ranges are valid.
        if (start == null && end == null) {
            return true;
        }
        // Complete ranges are only valid if both dates are valid and the start is before the end.
        if (start != null && end != null) {
            return this._isValidDateInstance(start) && this._isValidDateInstance(end) &&
                this._adapter.compareDate(start, end) <= 0;
        }
        // Partial ranges are valid if the start/end is valid.
        return (start == null || this._isValidDateInstance(start)) &&
            (end == null || this._isValidDateInstance(end));
    }
    /**
     * Checks whether the current selection is complete. In the case of a date range selection, this
     * is true if the current selection has a non-null `start` and `end`.
     */
    isComplete() {
        return this.selection.start != null && this.selection.end != null;
    }
    /** Clones the selection model. */
    clone() {
        const clone = new MatRangeDateSelectionModel(this._adapter);
        clone.updateSelection(this.selection, this);
        return clone;
    }
}
MatRangeDateSelectionModel.decorators = [
    { type: Injectable }
];
MatRangeDateSelectionModel.ctorParameters = () => [
    { type: DateAdapter }
];
/** @docs-private */
export function MAT_SINGLE_DATE_SELECTION_MODEL_FACTORY(parent, adapter) {
    return parent || new MatSingleDateSelectionModel(adapter);
}
/**
 * Used to provide a single selection model to a component.
 * @docs-private
 */
export const MAT_SINGLE_DATE_SELECTION_MODEL_PROVIDER = {
    provide: MatDateSelectionModel,
    deps: [[new Optional(), new SkipSelf(), MatDateSelectionModel], DateAdapter],
    useFactory: MAT_SINGLE_DATE_SELECTION_MODEL_FACTORY,
};
/** @docs-private */
export function MAT_RANGE_DATE_SELECTION_MODEL_FACTORY(parent, adapter) {
    return parent || new MatRangeDateSelectionModel(adapter);
}
/**
 * Used to provide a range selection model to a component.
 * @docs-private
 */
export const MAT_RANGE_DATE_SELECTION_MODEL_PROVIDER = {
    provide: MatDateSelectionModel,
    deps: [[new Optional(), new SkipSelf(), MatDateSelectionModel], DateAdapter],
    useFactory: MAT_RANGE_DATE_SELECTION_MODEL_FACTORY,
};
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D : NonNullable<T>;\n\n/**\n * Event emitted by the date selection model when its selection changes.\n * @docs-private\n */\nexport interface DateSelectionModelChange<S> {\n  /** New value for the selection. */\n  selection: S;\n\n  /** Object that triggered the change. */\n  source: unknown;\n\n  /** Previous value */\n  oldValue?: S;\n}\n\n/**\n * A selection model containing a date selection.\n * @docs-private\n */\n@Injectable()\nexport abstract class MatDateSelectionModel<S, D = ExtractDateTypeFromSelection<S>>\n    implements OnDestroy {\n  private readonly _selectionChanged = new Subject<DateSelectionModelChange<S>>();\n\n  /** Emits when the selection has changed. */\n  selectionChanged: Observable<DateSelectionModelChange<S>> = this._selectionChanged;\n\n  protected constructor(\n    /** The current selection. */\n    readonly selection: S,\n    protected _adapter: DateAdapter<D>) {\n    this.selection = selection;\n  }\n\n  /**\n   * Updates the current selection in the model.\n   * @param value New selection that should be assigned.\n   * @param source Object that triggered the selection change.\n   */\n  updateSelection(value: S, source: unknown) {\n    const oldValue = (this as {selection: S}).selection;\n    (this as {selection: S}).selection = value;\n    this._selectionChanged.next({selection: value, source, oldValue});\n  }\n\n  ngOnDestroy() {\n    this._selectionChanged.complete();\n  }\n\n  protected _isValidDateInstance(date: D): boolean {\n    return this._adapter.isDateInstance(date) && this._adapter.isValid(date);\n  }\n\n  /** Adds a date to the current selection. */\n  abstract add(date: D | null): void;\n\n  /** Checks whether the current selection is valid. */\n  abstract isValid(): boolean;\n\n  /** Checks whether the current selection is complete. */\n  abstract isComplete(): boolean;\n\n  /** Clones the selection model. */\n  abstract clone(): MatDateSelectionModel<S, D>;\n}\n\n/**\n * A selection model that contains a single date.\n * @docs-private\n */\n@Injectable()\nexport class MatSingleDateSelectionModel<D> extends MatDateSelectionModel<D | null, D> {\n  constructor(adapter: DateAdapter<D>) {\n    super(null, adapter);\n  }\n\n  /**\n   * Adds a date to the current selection. In the case of a single date selection, the added date\n   * simply overwrites the previous selection\n   */\n  add(date: D | null) {\n    super.updateSelection(date, this);\n  }\n\n  /** Checks whether the current selection is valid. */\n  isValid(): boolean {\n    return this.selection != null && this._isValidDateInstance(this.selection);\n  }\n\n  /**\n   * Checks whether the current selection is complete. In the case of a single date selection, this\n   * is true if the current selection is not null.\n   */\n  isComplete() {\n    return this.selection != null;\n  }\n\n  /** Clones the selection model. */\n  clone() {\n    const clone = new MatSingleDateSelectionModel<D>(this._adapter);\n    clone.updateSelection(this.selection, this);\n    return clone;\n  }\n}\n\n/**\n * A selection model that contains a date range.\n * @docs-private\n */\n@Injectable()\nexport class MatRangeDateSelectionModel<D> extends MatDateSelectionModel<DateRange<D>, D> {\n  constructor(adapter: DateAdapter<D>) {\n    super(new DateRange<D>(null, null), adapter);\n  }\n\n  /**\n   * Adds a date to the current selection. In the case of a date range selection, the added date\n   * fills in the next `null` value in the range. If both the start and the end already have a date,\n   * the selection is reset so that the given date is the new `start` and the `end` is null.\n   */\n  add(date: D | null): void {\n    let {start, end} = this.selection;\n\n    if (start == null) {\n      start = date;\n    } else if (end == null) {\n      end = date;\n    } else {\n      start = date;\n      end = null;\n    }\n\n    super.updateSelection(new DateRange<D>(start, end), this);\n  }\n\n  /** Checks whether the current selection is valid. */\n  isValid(): boolean {\n    const {start, end} = this.selection;\n\n    // Empty ranges are valid.\n    if (start == null && end == null) {\n      return true;\n    }\n\n    // Complete ranges are only valid if both dates are valid and the start is before the end.\n    if (start != null && end != null) {\n      return this._isValidDateInstance(start) && this._isValidDateInstance(end) &&\n             this._adapter.compareDate(start, end) <= 0;\n    }\n\n    // Partial ranges are valid if the start/end is valid.\n    return (start == null || this._isValidDateInstance(start)) &&\n           (end == null || this._isValidDateInstance(end));\n  }\n\n  /**\n   * Checks whether the current selection is complete. In the case of a date range selection, this\n   * is true if the current selection has a non-null `start` and `end`.\n   */\n  isComplete(): boolean {\n    return this.selection.start != null && this.selection.end != null;\n  }\n\n  /** Clones the selection model. */\n  clone() {\n    const clone = new MatRangeDateSelectionModel<D>(this._adapter);\n    clone.updateSelection(this.selection, this);\n    return clone;\n  }\n}\n\n/** @docs-private */\nexport function MAT_SINGLE_DATE_SELECTION_MODEL_FACTORY(\n    parent: MatSingleDateSelectionModel<unknown>, adapter: DateAdapter<unknown>) {\n  return parent || new MatSingleDateSelectionModel(adapter);\n}\n\n/**\n * Used to provide a single selection model to a component.\n * @docs-private\n */\nexport const MAT_SINGLE_DATE_SELECTION_MODEL_PROVIDER: FactoryProvider = {\n  provide: MatDateSelectionModel,\n  deps: [[new Optional(), new SkipSelf(), MatDateSelectionModel], DateAdapter],\n  useFactory: MAT_SINGLE_DATE_SELECTION_MODEL_FACTORY,\n};\n\n\n/** @docs-private */\nexport function MAT_RANGE_DATE_SELECTION_MODEL_FACTORY(\n    parent: MatSingleDateSelectionModel<unknown>, adapter: DateAdapter<unknown>) {\n  return parent || new MatRangeDateSelectionModel(adapter);\n}\n\n/**\n * Used to provide a range selection model to a component.\n * @docs-private\n */\nexport const MAT_RANGE_DATE_SELECTION_MODEL_PROVIDER: FactoryProvider = {\n  provide: MatDateSelectionModel,\n  deps: [[new Optional(), new SkipSelf(), MatDateSelectionModel], DateAdapter],\n  useFactory: MAT_RANGE_DATE_SELECTION_MODEL_FACTORY,\n};\n"]}