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

import {
    BoolExpression,
    BoolExpressionConverter,
    StringExpression,
    StringExpressionConverter,
} from 'adaptive-expressions';

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

type PropertiesInput = Record<string, string>;
type PropertiesOutput = Record<string, StringExpression>;

/**
 * Converter to convert telemetry properties configuration.
 */
class TelemetryPropertiesConverter implements Converter<PropertiesInput, PropertiesOutput> {
    /**
     * Converts a [PropertiesInput](xref:botbuilder-dialogs-adaptive.PropertiesInput) or [PropertiesOutput](xref:botbuilder-dialogs-adaptive.PropertiesOutput) into telemetry [PropertiesOutput](xref:botbuilder-dialogs-adaptive.PropertiesOutput).
     *
     * @param value The [PropertiesInput](xref:botbuilder-dialogs-adaptive.PropertiesInput) or [PropertiesOutput](xref:botbuilder-dialogs-adaptive.PropertiesOutput) to convert.
     * @returns The converted [StringExpression](xref:adaptive-expressions.StringExpression).
     */
    convert(value: PropertiesInput | PropertiesOutput): PropertiesOutput {
        return Object.entries(value).reduce((properties, [key, value]) => {
            const property = value instanceof StringExpression ? value : new StringExpression(value);
            return { ...properties, [key]: property };
        }, {});
    }
}

export interface TelemetryTrackEventActionConfiguration extends DialogConfiguration {
    disabled?: BoolProperty;
    eventName?: StringProperty;
    properties?: PropertiesInput | PropertiesOutput;
}

/**
 * Track a custom event.
 */
export class TelemetryTrackEventAction<O extends object = {}>
    extends Dialog
    implements TelemetryTrackEventActionConfiguration
{
    static $kind = 'Microsoft.TelemetryTrackEventAction';

    /**
     * Initializes a new instance of the [TelemetryTrackEventAction](xref:botbuilder-dialogs-adaptive.TelemetryTrackEventAction) class.
     *
     * @param eventName Name to use for the event.
     * @param properties Properties to attach to the tracked event.
     */
    constructor(eventName: string, properties: { [name: string]: string });

    /**
     * Initializes a new instance of the [TelemetryTrackEventAction](xref:botbuilder-dialogs-adaptive.TelemetryTrackEventAction) class.
     *
     * @param eventName Optional. Name to use for the event.
     * @param properties Optional. Properties to attach to the tracked event.
     */
    constructor(eventName?: string, properties?: { [name: string]: string }) {
        super();
        if (eventName) {
            this.eventName = new StringExpression(eventName);
        }
        if (properties) {
            this.properties = {};
            for (const name in properties) {
                this.properties[name] = new StringExpression(properties[name]);
            }
        }
    }

    /**
     * Gets or sets an optional expression which if is true will disable this action.
     */
    disabled: BoolExpression;

    /**
     * Gets or sets a name to use for the event.
     */
    eventName: StringExpression;

    /**
     * Gets or sets the properties to attach to the tracked event.
     */
    properties: { [name: string]: StringExpression };

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

    /**
     * Starts a new [Dialog](xref:botbuilder-dialogs.Dialog) and pushes it 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.eventName) {
            const name = this.eventName.getValue(dc.state);
            const properties = {};
            if (this.properties) {
                for (const name in this.properties) {
                    properties[name] = this.properties[name].getValue(dc.state);
                }
            }
            this.telemetryClient.trackEvent({ name, properties });
        }

        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 `TelemetryTrackEventAction[${this.eventName && this.eventName.toString()}]`;
    }
}