/* Copyright (c) 2015-present, salesforce.com, inc. All rights reserved */
/* Licensed under BSD 3-Clause - see LICENSE.txt or git.io/sfdc-license */

import React from 'react';

import PropTypes from 'prop-types';
import YearPicklist from './year-picklist';
import Button from '../../button';

import DateUtil from '../../../utilities/date';

class DatepickerMonthNavigation extends React.Component {
	static displayName = 'SLDSDatepickerMonthNavigation';

	static propTypes = {
		/**
		 * Label for button to go to the next month
		 */
		assistiveTextNextMonth: PropTypes.string.isRequired,
		/**
		 * Label for button to go to the previous month
		 */
		assistiveTextPreviousMonth: PropTypes.string.isRequired,
		/**
		 * HTML id for component
		 */
		id: PropTypes.string,
		/**
		 * Date used to create calendar that is displayed. This is typically the initial day focused when using the keyboard navigation. Focus will be set to this date if available.
		 */
		initialDateForCalendarRender: PropTypes.instanceOf(Date).isRequired,
		/**
		 * Displayed calendar has changed or re-rendered
		 */
		onChangeMonth: PropTypes.func.isRequired,
		/**
		 * Names of the months
		 */
		monthLabels: PropTypes.array.isRequired,
		/**
		 * For keyboard navigation. In order to trap focus within the dialog, the first DOM node with a tab index should be listened to.
		 */
		onPreviousMonthKeyDown: PropTypes.func,
		/**
		 * Callback that passes in the DOM reference of the `<button>` DOM node within this component. Primary use is to allow `focus` to be called. You should still test if the node exists, since rendering is asynchronous.
		 */
		previousMonthRef: PropTypes.func.isRequired,
		/**
		 * Offset of year from current year that can be selected in the year selection dropdown. (2017 - 5 = 2012).
		 */
		relativeYearFrom: PropTypes.number,
		/**
		 * Offset of year from current year that can be selected in the year selection dropdown. (2017 + 5 = 2012).
		 */
		relativeYearTo: PropTypes.number,
	};

	getMonthLabel = () =>
		this.props.monthLabels[
			new Date(this.props.initialDateForCalendarRender).getMonth()
		];

	getYearLabel = () =>
		new Date(this.props.initialDateForCalendarRender).getFullYear();

	handleClick = (event) => {
		event.preventDefault();
		event.stopPropagation();
	};

	handleYearSelect = (initialDateForCalendarRender) => {
		this.props.onChangeMonth(undefined, initialDateForCalendarRender);
	};

	previousMonthClicked = () => {
		this.props.onChangeMonth(
			undefined,
			DateUtil.addMonths(this.props.initialDateForCalendarRender, -1)
		);
	};

	nextMonthClicked = () => {
		this.props.onChangeMonth(
			undefined,
			DateUtil.addMonths(this.props.initialDateForCalendarRender, 1)
		);
	};

	render() {
		return (
			<div className="slds-datepicker__filter slds-grid">
				<div
					className="slds-datepicker__filter_month slds-grid slds-grid_align-spread slds-grow"
					style={{ flex: 1.75 }}
				>
					<div className="slds-align-middle">
						<Button
							assistiveText={{ icon: this.props.assistiveTextPreviousMonth }}
							iconCategory="utility"
							iconName="left"
							iconVariant="container"
							onKeyDown={this.props.onPreviousMonthKeyDown}
							onClick={this.previousMonthClicked}
							buttonRef={(component) => {
								this.props.previousMonthRef(component);
							}}
							variant="icon"
							type="button"
						/>
					</div>
					<h2
						id={`${this.props.id}-month`}
						className="slds-align-middle"
						aria-live="assertive"
						aria-atomic
					>
						{this.getMonthLabel()}{' '}
						<span className="slds-assistive-text">{this.getYearLabel()}</span>
					</h2>
					<div className="slds-align-middle">
						<Button
							assistiveText={{ icon: this.props.assistiveTextNextMonth }}
							iconCategory="utility"
							iconName="right"
							iconVariant="container"
							onClick={this.nextMonthClicked}
							variant="icon"
							type="button"
						/>
					</div>
				</div>
				<YearPicklist
					id={this.props.id}
					initialDateForCalendarRender={this.props.initialDateForCalendarRender}
					onChangeMonth={this.handleYearSelect}
					relativeYearFrom={this.props.relativeYearFrom}
					relativeYearTo={this.props.relativeYearTo}
				/>
			</div>
		);
	}
}

export default DatepickerMonthNavigation;