const React = require('react'); const Component = React.Component;
const { ListView, View, Text, Button, StyleSheet, Platform } = require('react-native');
const { connect } = require('react-redux');
const { reg } = require('lib/registry.js');
const { ScreenHeader } = require('lib/components/screen-header.js');
const { time } = require('lib/time-utils');
const { themeStyle } = require('lib/components/global-style.js');
const { Logger } = require('lib/logger.js');
const { BaseScreenComponent } = require('lib/components/base-screen.js');
const { _ } = require('lib/locale.js');

class LogScreenComponent extends BaseScreenComponent {
	
	static navigationOptions(options) {
		return { header: null };
	}

	constructor() {
		super();
		const ds = new ListView.DataSource({
			rowHasChanged: (r1, r2) => { return r1 !== r2; }
		});
		this.state = {
			dataSource: ds,
			showErrorsOnly: false,
		};
		this.styles_ = {};
	}

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

		if (this.styles_[this.props.theme]) return this.styles_[this.props.theme];
		this.styles_ = {};

		let styles = {
			row: {
				flexDirection: 'row',
				paddingLeft: 1,
				paddingRight: 1,
				paddingTop:0,
				paddingBottom:0,
			},
			rowText: {
				fontSize: 10,
				color: theme.color,				
			},
		};

		if (Platform.OS !== 'ios') { // Crashes on iOS with error "Unrecognized font family 'monospace'"
			styles.rowText.fontFamily = 'monospace';
		}

		styles.rowTextError = Object.assign({}, styles.rowText);
		styles.rowTextError.color = theme.colorError;

		styles.rowTextWarn = Object.assign({}, styles.rowText);
		styles.rowTextWarn.color = theme.colorWarn;

		this.styles_[this.props.theme] = StyleSheet.create(styles);
		return this.styles_[this.props.theme];
	}

	UNSAFE_componentWillMount() {
		this.resfreshLogEntries();
	}

	resfreshLogEntries(showErrorsOnly = null) {
		if (showErrorsOnly === null) showErrorsOnly = this.state.showErrorsOnly;

		let levels = [Logger.LEVEL_DEBUG, Logger.LEVEL_INFO, Logger.LEVEL_WARN, Logger.LEVEL_ERROR];
		if  (showErrorsOnly) levels = [Logger.LEVEL_WARN, Logger.LEVEL_ERROR]

		reg.logger().lastEntries(1000, { levels: levels }).then((entries) => {
			const newDataSource = this.state.dataSource.cloneWithRows(entries);
			this.setState({ dataSource: newDataSource });
		});
	}

	toggleErrorsOnly() {
		const showErrorsOnly = !this.state.showErrorsOnly;
		this.setState({ showErrorsOnly: showErrorsOnly });
		this.resfreshLogEntries(showErrorsOnly);
	}

	render() {
		let renderRow = (item) => {
			let textStyle = this.styles().rowText;
			if (item.level == Logger.LEVEL_WARN) textStyle = this.styles().rowTextWarn;
			if (item.level == Logger.LEVEL_ERROR) textStyle = this.styles().rowTextError;
			
			return (
				<View style={this.styles().row}>
					<Text style={textStyle}>{time.formatMsToLocal(item.timestamp, 'MM-DDTHH:mm:ss') + ': ' + item.message}</Text>
				</View>
			);
		}

		// `enableEmptySections` is to fix this warning: https://github.com/FaridSafi/react-native-gifted-listview/issues/39
		return (
			<View style={this.rootStyle(this.props.theme).root}>
				<ScreenHeader title={_('Log')}/>
				<ListView
					dataSource={this.state.dataSource}
					renderRow={renderRow}
					enableEmptySections={true}
				/>
				<View style={{flexDirection: 'row'}}>
					<View style={{flex:1, marginRight: 5 }}>
						<Button title={_("Refresh")} onPress={() => { this.resfreshLogEntries(); }}/>
					</View>
					<View style={{flex:1}}>
						<Button title={this.state.showErrorsOnly ? _("Show all") : _("Errors only")} onPress={() => { this.toggleErrorsOnly(); }}/>
					</View>
				</View>
			</View>
		);
	}

}

const LogScreen = connect(
	(state) => {
		return {
			theme: state.settings.theme,
		};
	}
)(LogScreenComponent)

module.exports = { LogScreen };