import React from 'react';
import ReactDOM from 'react-dom';
import PropTypes from 'prop-types';
import classNames from 'classnames';
import { Helmet } from 'react-helmet';
import { withRouter } from 'react-router-dom';
import _ from 'lodash';

import { LayoutContent } from './LayoutContent';
import { LayoutNavbar } from './LayoutNavbar';
import { LayoutSidebar } from './LayoutSidebar';
import { PageConfigContext } from './PageConfigContext';
import { ThemeClass } from './../Theme';

import config from './../../../config';

const findChildByType = (children, targetType) => {
    let result;

    React.Children.forEach(children, (child) => {
        if (child.type.layoutPartName === targetType.layoutPartName) {
            result = child;
        }
    });

    return result;
};
const findChildrenByType = (children, targetType) => {
    return _.filter(React.Children.toArray(children), (child) =>
        child.type.layoutPartName === targetType.layoutPartName);
};

const responsiveBreakpoints = {
    'xs': { max: 575.8 },
    'sm': { min: 576, max: 767.8 },
    'md': { min: 768, max: 991.8 },
    'lg': { min: 992, max: 1199.8 },
    'xl': { min: 1200 }
};

class Layout extends React.Component {
    static propTypes = {
        children: PropTypes.node,
        sidebarSlim: PropTypes.bool,
        location: PropTypes.object,
        favIcons: PropTypes.array
    }

    constructor(props) {
        super(props);

        this.state = {
            sidebarHidden: false,
            navbarHidden: false,
            footerHidden: false,
            sidebarCollapsed: false,
            screenSize: '',
            animationsDisabled: true,

            pageTitle: null,
            pageDescription: config.siteDescription,
            pageKeywords: config.siteKeywords
        };

        this.lastLgSidebarCollapsed = false;
        this.containerRef = React.createRef();
    }

    componentDidMount() {
        // Determine the current window size
        // and set it up in the context state
        const layoutAdjuster = () => {
            const { screenSize } = this.state;
            let currentScreenSize;

            _.forOwn(responsiveBreakpoints, (value, key) => {
                const queryParts = [
                    `${ _.isUndefined(value.min) ? '' : `(min-width: ${value.min}px)` }`,
                    `${ _.isUndefined(value.max) ? '' : `(max-width: ${value.max}px)`}`
                ];
                const query = _.compact(queryParts).join(' and ');

                if (window.matchMedia(query).matches) {
                    currentScreenSize = key;
                }
            });

            if (screenSize !== currentScreenSize) {
                this.setState({ screenSize: currentScreenSize });
                this.updateLayoutOnScreenSize(currentScreenSize);
            }
        };

        // Add window initialization
        if (typeof window !== 'undefined') {
            window.addEventListener('resize', () => {
                setTimeout(layoutAdjuster.bind(this), 0);
            });
            
            layoutAdjuster();

            window.requestAnimationFrame(() => {
                this.setState({ animationsDisabled: false });
            });
        }
        // Add document initialization
        if (typeof document !== 'undefined') {
            this.bodyElement = document.body;
            this.documentElement = document.documentElement;
        }
    }

    componentDidUpdate(prevProps, prevState) {
        // Prevent content scrolling in overlay mode
        if (
            this.bodyElement && this.documentElement && (
                this.state.screenSize === 'xs' ||
                this.state.screenSize === 'sm' ||
                this.state.screenSize === 'md'
            )
        ) {
            if (prevState.sidebarCollapsed !== this.state.sidebarCollapsed) {
                // Most of the devices
                const styleUpdate = this.state.sidebarCollapsed ? {
                        overflowY: 'auto',
                        touchAction: 'auto'
                    }: {
                        overflowY: 'hidden',
                        touchAction: 'none'
                    }
                Object.assign(this.bodyElement.style, styleUpdate);
                Object.assign(this.documentElement.style, styleUpdate);
            }
        }

        // After location change
        if (prevProps.location.pathname !== this.props.location.pathname) {
            // Scroll to top
            if (this.bodyElement && this.documentElement) {
                this.documentElement.scrollTop = this.bodyElement.scrollTop = 0;
            }

            // Hide the sidebar when in overlay mode
            if (
                !this.state.sidebarCollapsed && (
                    this.state.screenSize === 'xs' ||
                    this.state.screenSize === 'sm' ||
                    this.state.screenSize === 'md'
                )
            ) {
                // Add some time to prevent jank while the dom is updating
                setTimeout(() => {
                    this.setState({ sidebarCollapsed: true });
                }, 100);
            }
        }

        // Update positions of STICKY navbars
        this.updateNavbarsPositions();
    }

    updateLayoutOnScreenSize(screenSize) {
        if (
            screenSize === 'md' ||
            screenSize === 'sm' ||
            screenSize === 'xs'
        ) {
            // Save for recovering to lg later
            this.lastLgSidebarCollapsed = this.state.sidebarCollapsed;
            this.setState({ sidebarCollapsed: true });
        } else {
            this.setState({ sidebarCollapsed: this.lastLgSidebarCollapsed });
        }
    }

    updateNavbarsPositions() {
        // eslint-disable-next-line react/no-find-dom-node
        const containerElement = ReactDOM.findDOMNode(this.containerRef.current);
        if (containerElement) {
            const navbarElements = containerElement.querySelectorAll(":scope .layout__navbar");
        
            // Calculate and update style.top of each navbar
            let totalNavbarsHeight = 0;
            navbarElements.forEach((navbarElement) => {
                const navbarBox = navbarElement.getBoundingClientRect();
                navbarElement.style.top = `${totalNavbarsHeight}px`;
                totalNavbarsHeight += navbarBox.height;
            });
        }
    }

    toggleSidebar() {
        this.setState({
            sidebarCollapsed: !this.state.sidebarCollapsed
        });
    }

    setElementsVisibility(elements) {
        this.setState(_.pick(elements, ['sidebarHidden', 'navbarHidden', 'footerHidden']));
    }

    render() {
        const { children, favIcons } = this.props;
        const sidebar = findChildByType(children, LayoutSidebar);
        const navbars = findChildrenByType(children, LayoutNavbar);
        const content = findChildByType(children, LayoutContent);
        const otherChildren = _.differenceBy(
            React.Children.toArray(children),
            [
                sidebar,
                ...navbars,
                content
            ],
            'type'
        );
        const layoutClass = classNames('layout', 'layout--animations-enabled', {
            //'layout--only-navbar': this.state.sidebarHidden && !this.state.navbarHidden
        });

        return (
            <PageConfigContext.Provider
                value={{
                    ...this.state,
                    sidebarSlim: !!this.props.sidebarSlim && (
                        this.state.screenSize === 'lg' ||
                        this.state.screenSize === 'xl'
                    ),

                    toggleSidebar: this.toggleSidebar.bind(this),
                    setElementsVisibility: this.setElementsVisibility.bind(this),
                    changeMeta: (metaData) => { this.setState(metaData) }
                }}
            >
                <Helmet>
                    <meta charSet="utf-8" />
                    <title>{ config.siteTitle + (this.state.pageTitle ? ` - ${this.state.pageTitle}` : '') }</title>
                    <link rel="canonical" href={ config.siteCannonicalUrl } />
                    <meta name="description" content={ this.state.pageDescription } />
                    {
                        _.map(favIcons, (favIcon, index) => (
                            <link { ...favIcon } key={ index } />
                        ))
                    }

                </Helmet>
                <ThemeClass>
                    {(themeClass) => (
                        <div className={ classNames(layoutClass, themeClass) } ref={ this.containerRef }>
                            { 
                                !this.state.sidebarHidden && sidebar && React.cloneElement(sidebar, {
                                    sidebarSlim: !!this.props.sidebarSlim && this.state.sidebarCollapsed && (
                                        this.state.screenSize === 'lg' || this.state.screenSize === 'xl'
                                    ),
                                    sidebarCollapsed: !this.props.sidebarSlim && this.state.sidebarCollapsed
                                })
                            }

                            <div className="layout__wrap">
                                { !this.state.navbarHidden && navbars }

                                { content }
                            </div>

                            { otherChildren }
                        </div>
                    )}
                </ThemeClass>
            </PageConfigContext.Provider>
        );
    }
}

const routedLayout = withRouter(Layout);

export { routedLayout as Layout };