/**
 * @module adaptive-expressions
 */
/**
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */

import { Expression } from '../expression';
import { EvaluateExpressionDelegate, ExpressionEvaluator } from '../expressionEvaluator';
import { ExpressionType } from '../expressionType';
import { FunctionUtils } from '../functionUtils';
import { InternalFunctionUtils } from '../functionUtils.internal';
import { ReturnType } from '../returnType';

/**
 * Check whether a string ends with a specific substring. Return true if the substring is found, or return false if not found.
 * This function is case-insensitive.
 */
export class EndsWith extends ExpressionEvaluator {
    /**
     * Initializes a new instance of the [EndsWith](xref:adaptive-expressions.EndsWith) class.
     */
    constructor() {
        super(ExpressionType.EndsWith, EndsWith.evaluator(), ReturnType.Boolean, EndsWith.validator);
    }

    /**
     * @private
     */
    private static evaluator(): EvaluateExpressionDelegate {
        return FunctionUtils.apply(
            (args: any[]): boolean =>
                InternalFunctionUtils.parseStringOrUndefined(args[0]).endsWith(
                    InternalFunctionUtils.parseStringOrUndefined(args[1])
                ),
            FunctionUtils.verifyStringOrNull
        );
    }

    /**
     * @private
     */
    private static validator(expression: Expression): void {
        FunctionUtils.validateArityAndAnyType(expression, 2, 2, ReturnType.String);
    }
}