/**
 * @module botbuilder-dialogs-adaptive
 */
/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
import { BoolExpression, BoolExpressionConverter, StringExpression } from 'adaptive-expressions';
import { BoolProperty } from '../properties';

import {
    Converter,
    ConverterFactory,
    Dialog,
    DialogConfiguration,
    DialogContext,
    DialogTurnResult,
} from 'botbuilder-dialogs';

class PropertiesConverter implements Converter<string[], StringExpression[]> {
    convert(items: Array<string | StringExpression>): StringExpression[] {
        return items.map((item) => (typeof item === 'string' ? new StringExpression(item) : item));
    }
}

export interface DeletePropertiesConfiguration extends DialogConfiguration {
    properties?: Array<string | StringExpression>;
    disabled?: BoolProperty;
}

/**
 * Deletes a collection of properties from memory.
 */
export class DeleteProperties<O extends object = {}> extends Dialog<O> implements DeletePropertiesConfiguration {
    static $kind = 'Microsoft.DeleteProperties';

    constructor();

    /**
     * Initializes a new instance of the [DeleteProperties](xref:botbuilder-dialogs-adaptive.DeleteProperties) class.
     *
     * @param properties Optional. Collection of property paths to remove.
     */
    constructor(properties?: string[]) {
        super();
        if (properties) {
            this.properties = properties.map((property): StringExpression => new StringExpression(property));
        }
    }

    /**
     * Collection of property paths to remove.
     */
    properties: StringExpression[] = [];

    /**
     * An optional expression which if is true will disable this action.
     */
    disabled?: BoolExpression;

    /**
     * @param property The key of the conditional selector configuration.
     * @returns The converter for the selector configuration.
     */
    getConverter(property: keyof DeletePropertiesConfiguration): Converter | ConverterFactory {
        switch (property) {
            case 'properties':
                return new PropertiesConverter();
            case 'disabled':
                return new BoolExpressionConverter();
            default:
                return super.getConverter(property);
        }
    }

    /**
     * Called when the [Dialog](xref:botbuilder-dialogs.Dialog) is started and pushed onto the dialog stack.
     *
     * @param dc The [DialogContext](xref:botbuilder-dialogs.DialogContext) for the current turn of conversation.
     * @param _options Optional. Initial information to pass to the dialog.
     * @returns A `Promise` representing the asynchronous operation.
     */
    async beginDialog(dc: DialogContext, _options?: O): Promise<DialogTurnResult> {
        if (this.disabled && this.disabled.getValue(dc.state)) {
            return await dc.endDialog();
        }

        if (this.properties && this.properties.length > 0) {
            for (let i = 0; i < this.properties.length; i++) {
                dc.state.deleteValue(this.properties[i].getValue(dc.state));
            }
        }

        return await dc.endDialog();
    }

    /**
     * @protected
     * Builds the compute Id for the [Dialog](xref:botbuilder-dialogs.Dialog).
     * @returns A `string` representing the compute Id.
     */
    protected onComputeId(): string {
        return `DeleteProperties[${this.properties.map((property): string => property.toString()).join(',')}]`;
    }
}