/*!
 * Copyright (c) Microsoft Corporation and contributors. All rights reserved.
 * Licensed under the MIT License.
 */

import {
	ILumberjackSchemaValidator,
	ILumberjackSchemaValidationResult,
	BaseTelemetryProperties,
	QueuedMessageProperties,
} from "./resources";

/**
 * @internal
 */
export abstract class BaseLumberjackSchemaValidator implements ILumberjackSchemaValidator {
	protected readonly validators = new Map<string, (propvalue: string) => boolean>();

	public validate(props: Map<string, any>): ILumberjackSchemaValidationResult {
		const validationFailedForProperties: string[] = [];
		this.validators.forEach((validator, keyName) => {
			// Validation should pass if the required propery is included and satisfies the requirements.
			if (props.has(keyName) && validator(props.get(keyName))) {
				return;
			}

			// Otherwise, validation should fail and the property name is added to the "failed" list.
			validationFailedForProperties.push(keyName);
		});

		return {
			validationPassed: validationFailedForProperties.length === 0,
			validationFailedForProperties,
		};
	}

	// Validators
	protected readonly stringValidation = (propValue: any) => {
		return this.isUndefined(propValue) || (this.isString(propValue) && propValue.length > 0);
	};

	protected readonly numberValidation = (propValue: any) => {
		return this.isUndefined(propValue) || this.isNumber(propValue);
	};

	protected readonly positiveNumberValidation = (propValue: any) => {
		return this.isUndefined(propValue) || (this.isNumber(propValue) && propValue >= -1);
	};

	// Helpers
	private isUndefined(propValue: any): propValue is undefined {
		return propValue === undefined;
	}

	private isNumber(propValue: any): propValue is number {
		return typeof propValue === "number";
	}

	private isString(propValue: any): propValue is string {
		return typeof propValue === "string";
	}
}

/**
 * @internal
 */
export class BasePropertiesValidator extends BaseLumberjackSchemaValidator {
	constructor() {
		super();
		this.validators.set(BaseTelemetryProperties.tenantId, this.stringValidation);
		this.validators.set(BaseTelemetryProperties.documentId, this.stringValidation);
	}

	validate(props: Map<string, any>): ILumberjackSchemaValidationResult {
		return super.validate(props);
	}
}

/**
 * @internal
 */
export class LambdaSchemaValidator extends BasePropertiesValidator {
	constructor() {
		super();
		this.validators.set(QueuedMessageProperties.topic, this.stringValidation);
		this.validators.set(QueuedMessageProperties.partition, this.positiveNumberValidation);
		this.validators.set(QueuedMessageProperties.offset, this.numberValidation);
	}

	validate(props: Map<string, any>): ILumberjackSchemaValidationResult {
		return super.validate(props);
	}
}