const React = require('react');
const { connect } = require('react-redux');
const { themeStyle } = require('lib/theme');
const { _ } = require('lib/locale.js');
const { bridge } = require('electron').remote.require('./bridge');
const CommandService = require('lib/services/CommandService').default;

const commands = [
	require('./commands/focusSearch'),
];

class HeaderComponent extends React.Component {
	constructor() {
		super();
		this.state = {
			searchQuery: '',
			showSearchUsageLink: false,
			showButtonLabels: true,
		};

		for (const command of commands) {
			CommandService.instance().registerRuntime(command.declaration.name, command.runtime(this));
		}

		this.scheduleSearchChangeEventIid_ = null;
		this.searchOnQuery_ = null;
		this.searchElement_ = null;

		const triggerOnQuery = query => {
			clearTimeout(this.scheduleSearchChangeEventIid_);
			if (this.searchOnQuery_) this.searchOnQuery_(query);
			this.scheduleSearchChangeEventIid_ = null;
		};

		this.search_onChange = event => {
			this.setState({ searchQuery: event.target.value });

			if (this.scheduleSearchChangeEventIid_) clearTimeout(this.scheduleSearchChangeEventIid_);

			this.scheduleSearchChangeEventIid_ = setTimeout(() => {
				triggerOnQuery(this.state.searchQuery);
			}, 500);
		};

		this.search_onClear = () => {
			this.resetSearch();
			if (this.searchElement_) this.searchElement_.focus();
		};

		this.search_onFocus = () => {
			if (this.hideSearchUsageLinkIID_) {
				clearTimeout(this.hideSearchUsageLinkIID_);
				this.hideSearchUsageLinkIID_ = null;
			}

			this.setState({ showSearchUsageLink: true });
		};

		this.search_onBlur = () => {
			if (this.hideSearchUsageLinkIID_) return;

			this.hideSearchUsageLinkIID_ = setTimeout(() => {
				this.setState({ showSearchUsageLink: false });
			}, 5000);
		};

		this.search_keyDown = event => {
			if (event.keyCode === 27) {
				// ESCAPE
				this.resetSearch();
			}
		};

		this.resetSearch = () => {
			this.setState({ searchQuery: '' });
			triggerOnQuery('');
		};

		this.searchUsageLink_click = () => {
			bridge().openExternal('https://joplinapp.org/#searching');
		};
	}

	componentDidUpdate(prevProps) {
		if (prevProps.notesParentType !== this.props.notesParentType && this.props.notesParentType !== 'Search' && this.state.searchQuery) {
			this.resetSearch();
		}

		if (this.props.zoomFactor !== prevProps.zoomFactor || this.props.size !== prevProps.size) {
			this.determineButtonLabelState();
		}
	}

	componentDidMount() {
		this.determineButtonLabelState();
	}

	componentWillUnmount() {
		if (this.hideSearchUsageLinkIID_) {
			clearTimeout(this.hideSearchUsageLinkIID_);
			this.hideSearchUsageLinkIID_ = null;
		}

		for (const command of commands) {
			CommandService.instance().unregisterRuntime(command.declaration.name);
		}
	}

	determineButtonLabelState() {
		const mediaQuery = window.matchMedia(`(max-width: ${780 * this.props.zoomFactor}px)`);
		const showButtonLabels = !mediaQuery.matches;

		if (this.state.showButtonLabels !== showButtonLabels) {
			this.setState({
				showButtonLabels: !mediaQuery.matches,
			});
		}
	}

	back_click() {
		this.props.dispatch({ type: 'NAV_BACK' });
	}

	makeButton(key, style, options) {
		// TODO: "tab" type is not finished
		if (options.type === 'tab') {
			const buttons = [];
			for (let i = 0; i < options.items.length; i++) {
				const item = options.items[i];
				buttons.push(this.makeButton(key + item.title, style, Object.assign({}, options, {
					title: item.title,
					type: 'button',
				})));
			}

			return <span style={{ display: 'flex', flexDirection: 'row' }}>{buttons}</span>;
		}

		const theme = themeStyle(this.props.theme);

		let icon = null;
		if (options.iconName) {
			const iconStyle = {
				fontSize: Math.round(style.fontSize * 1.1),
				color: theme.iconColor,
			};
			if (options.title) iconStyle.marginRight = 5;
			if ('undefined' != typeof options.iconRotation) {
				iconStyle.transition = 'transform 0.15s ease-in-out';
				iconStyle.transform = `rotate(${options.iconRotation}deg)`;
			}
			icon = <i style={iconStyle} className={`fas ${options.iconName}`}></i>;
		}

		const isEnabled = !('enabled' in options) || options.enabled;
		const classes = ['button'];
		if (!isEnabled) classes.push('disabled');

		const finalStyle = Object.assign({}, style, {
			opacity: isEnabled ? 1 : 0.4,
		});

		const title = options.title ? options.title : '';

		if (options.type === 'checkbox' && options.checked) {
			finalStyle.backgroundColor = theme.selectedColor;
			finalStyle.borderWidth = 1;
			finalStyle.borderTopColor = theme.selectedDividerColor;
			finalStyle.borderLeftColor = theme.selectedDividerColor;
			finalStyle.borderTopStyle = 'solid';
			finalStyle.borderLeftStyle = 'solid';
			finalStyle.paddingLeft++;
			finalStyle.paddingTop++;
			finalStyle.paddingBottom--;
			finalStyle.paddingRight--;
			finalStyle.boxSizing = 'border-box';
		}

		return (
			<a
				className={classes.join(' ')}
				style={finalStyle}
				key={key}
				href="#"
				title={title}
				onClick={() => {
					if (isEnabled) options.onClick();
				}}
			>
				{icon}
				<span className="title" style={{
					display: this.state.showButtonLabels ? 'inline-block' : 'none',
				}}>{title}</span>
			</a>
		);
	}

	makeSearch(key, style, options, state) {
		const theme = themeStyle(this.props.theme);

		const inputStyle = {
			display: 'flex',
			flex: 1,
			marginLeft: 10,
			paddingLeft: 6,
			paddingRight: 6,
			paddingTop: 1, // vertical alignment with buttons
			paddingBottom: 0, // vertical alignment with buttons
			height: style.fontSize * 2,
			maxWidth: 300,
			color: style.color,
			fontSize: style.fontSize,
			fontFamily: style.fontFamily,
			backgroundColor: style.searchColor,
			border: '1px solid',
			borderColor: style.dividerColor,
		};

		const searchButton = {
			paddingLeft: 4,
			paddingRight: 4,
			paddingTop: 2,
			paddingBottom: 2,
			textDecoration: 'none',
		};

		const iconStyle = {
			display: 'flex',
			fontSize: Math.round(style.fontSize) * 1.2,
			color: style.color,
		};

		const containerStyle = {
			display: 'flex',
			flexDirection: 'row',
			flexGrow: 1,
			alignItems: 'center',
		};

		const iconName = state.searchQuery ? 'fa-times' : 'fa-search';
		const icon = <i style={iconStyle} className={`fas ${iconName}`}></i>;
		if (options.onQuery) this.searchOnQuery_ = options.onQuery;

		const usageLink = !this.state.showSearchUsageLink ? null : (
			<a onClick={this.searchUsageLink_click} style={theme.urlStyle} href="#">
				{_('Usage')}
			</a>
		);

		return (
			<div key={key} style={containerStyle}>
				<input type="text" style={inputStyle} placeholder={options.title} value={state.searchQuery} onChange={this.search_onChange} ref={elem => (this.searchElement_ = elem)} onFocus={this.search_onFocus} onBlur={this.search_onBlur} onKeyDown={this.search_keyDown} />
				<a href="#" style={searchButton} onClick={this.search_onClear}>
					{icon}
				</a>
				{usageLink}
			</div>
		);
	}

	render() {
		const style = Object.assign({}, this.props.style);
		const theme = themeStyle(this.props.theme);
		const showBackButton = this.props.showBackButton === undefined || this.props.showBackButton === true;
		style.height = theme.headerHeight;
		style.display = 'flex';
		style.flexDirection = 'row';
		style.borderBottom = `1px solid ${theme.dividerColor}`;
		style.boxSizing = 'border-box';

		const items = [];

		const itemStyle = {
			height: theme.headerHeight,
			display: 'flex',
			alignItems: 'center',
			paddingTop: 1,
			paddingBottom: 1,
			paddingLeft: theme.headerButtonHPadding,
			paddingRight: theme.headerButtonHPadding,
			color: theme.color,
			searchColor: theme.backgroundColor,
			dividerColor: theme.dividerColor,
			textDecoration: 'none',
			fontFamily: theme.fontFamily,
			fontSize: theme.fontSize,
			boxSizing: 'border-box',
			cursor: 'default',
			whiteSpace: 'nowrap',
			userSelect: 'none',
		};

		if (showBackButton) {
			items.push(this.makeButton('back', itemStyle, { title: _('Back'), onClick: () => this.back_click(), iconName: 'fa-chevron-left ' }));
		}

		if (this.props.items) {
			for (let i = 0; i < this.props.items.length; i++) {
				const item = this.props.items[i];

				if (item.type === 'search') {
					items.push(this.makeSearch(`item_${i}_search`, itemStyle, item, this.state));
				} else {
					items.push(this.makeButton(`item_${i}_${item.title}`, itemStyle, item));
				}
			}
		}

		return (
			<div className="header" style={style}>
				{items}
			</div>
		);
	}
}

const mapStateToProps = state => {
	return {
		theme: state.settings.theme,
		notesParentType: state.notesParentType,
		size: state.windowContentSize,
		zoomFactor: state.settings.windowContentZoomFactor / 100,
	};
};

const Header = connect(mapStateToProps)(HeaderComponent);

module.exports = { Header };