'use strict';

import React, { Component } from 'react';
import { translate } from 'react-i18next';
import PropTypes from 'prop-types';
import { withRouter } from 'react-router';
import { BrowserRouter as Router, Route, Link, Switch } from 'react-router-dom'
import './page.css';
import { withErrorHandling } from './error-handling';
import interoperableErrors from '../../../shared/interoperable-errors';
import { DismissibleAlert, Button } from './bootstrap-components';
import mailtrainConfig from 'mailtrainConfig';


class PageContent extends Component {
    static propTypes = {
        structure: PropTypes.object.isRequired
    }

    getRoutes(urlPrefix, children) {
        let routes = [];
        for (let routeKey in children) {
            const structure = children[routeKey];

            let path = urlPrefix + routeKey;
            let pathWithParams = path;

            if (structure.params) {
                pathWithParams = pathWithParams + '/' + structure.params.join('/');
            }

            if (structure.component || structure.render) {
                const route = {
                    component: structure.component,
                    render: structure.render,
                    path: (pathWithParams === '' ? '/' : pathWithParams)
                };

                routes.push(route);
            }

            if (structure.children) {
                routes = routes.concat(this.getRoutes(path + '/', structure.children));
            }
        }

        return routes;
    }

    renderRoute(route) {
        if (route.component) {
            return <Route key={route.path} exact path={route.path} component={route.component} />;
        } else if (route.render) {
            return <Route key={route.path} exact path={route.path} render={route.render} />;
        }
    }

    render() {
        let routes = this.getRoutes('', this.props.structure);
        return <Switch>{routes.map(x => this.renderRoute(x))}</Switch>;
    }
}

@withRouter
class Breadcrumb extends Component {
    static propTypes = {
        structure: PropTypes.object.isRequired
    }

    renderElement(breadcrumbElem) {
        if (breadcrumbElem.isActive) {
            return <li key={breadcrumbElem.idx} className="active">{breadcrumbElem.title}</li>;

        } else if (breadcrumbElem.externalLink) {
            return <li key={breadcrumbElem.idx}><a href={breadcrumbElem.externalLink}>{breadcrumbElem.title}</a></li>;

        } else if (breadcrumbElem.link) {
            let link;
            if (typeof breadcrumbElem.link === 'function') {
                link = breadcrumbElem.link(this.props.match);
            } else {
                link = breadcrumbElem.link;
            }
            return <li key={breadcrumbElem.idx}><Link to={link}>{breadcrumbElem.title}</Link></li>;

        } else {
            return <li key={breadcrumbElem.idx}>{breadcrumbElem.title}</li>;
        }
    }

    render() {
        const location = this.props.location.pathname;
        const locationElems = location.split('/');

        let breadcrumbElems = [];
        let children = this.props.structure;

        for (let idx = 0; idx < locationElems.length; idx++) {
            const breadcrumbElem = children[locationElems[idx]];
            if (!breadcrumbElem) {
                break;
            }

            breadcrumbElem.isActive = (idx === locationElems.length - 1);
            breadcrumbElem.idx = idx;

            breadcrumbElems.push(breadcrumbElem);
            children = breadcrumbElem.children;

            if (!children) {
                break;
            }
        }

        const renderedElems = breadcrumbElems.map(x => this.renderElement(x));

        return <ol className="breadcrumb">{renderedElems}</ol>;
    }
}



@withRouter
@withErrorHandling
class SectionContent extends Component {
    constructor(props) {
        super(props);

        this.state = {
            flashMessageText: ''
        }

        this.historyUnlisten = props.history.listen((location, action) => {
            this.closeFlashMessage();
        })


        // -------------------------------------------------------------------------------------------------------
        /* FIXME - remove this once we migrate fully to React
           This part transforms the flash notice rendered by the server to flash notice managed by React client.
           It is used primarily for the login info, but there may be some other cases.
         */
        const alrt = jQuery('.container>.alert');
        alrt.find('button').remove();

        const alrtText = alrt.text();
        if (alrtText) {
            this.state.flashMessageText = alrtText;

            const severityRegex = /alert-([^ ]*)/;
            const match = alrt.attr('class').match(severityRegex);

            if (match) {
                this.state.flashMessageSeverity = match[1];
            }
        }

        alrt.remove();
        // -------------------------------------------------------------------------------------------------------
    }

    static propTypes = {
        structure: PropTypes.object.isRequired,
        root: PropTypes.string.isRequired
    }

    static childContextTypes = {
        sectionContent: PropTypes.object
    }

    getChildContext() {
        return {
            sectionContent: this
        };
    }

    getFlashMessageText() {
        return this.state.flashMessageText;
    }

    getFlashMessageSeverity() {
        return this.state.flashMessageSeverity;
    }

    setFlashMessage(severity, text) {
        this.setState({
            flashMessageText: text,
            flashMessageSeverity: severity
        });
    }

    navigateTo(path) {
        this.props.history.push(path);
    }

    navigateBack() {
        this.props.history.goBack();
    }

    navigateToWithFlashMessage(path, severity, text) {
        this.props.history.push(path);
        this.setFlashMessage(severity, text);
    }

    ensureAuthenticated() {
        if (!mailtrainConfig.isAuthenticated) {
            /* FIXME, once we turn Mailtrain to single-page application, this should become navigateTo */
            window.location = '/account/login?next=' + encodeURIComponent(this.props.root);
        }
    }

    errorHandler(error) {
        if (error instanceof interoperableErrors.NotLoggedInError) {
            /* FIXME, once we turn Mailtrain to single-page application, this should become navigateTo */
            window.location = '/account/login?next=' + encodeURIComponent(this.props.root);
        } else if (error.response && error.response.data && error.response.data.message) {
            console.error(error);
            this.navigateToWithFlashMessage(this.props.root, 'danger', error.response.data.message);
        } else {
            console.error(error);
            this.navigateToWithFlashMessage(this.props.root, 'danger', error.message);
        }
        return true;
    }

    async closeFlashMessage() {
        this.setState({
            flashMessageText: ''
        })
    }

    render() {
        return (
            <div>
                <Breadcrumb structure={this.props.structure} />
                {(this.state.flashMessageText && <DismissibleAlert severity={this.state.flashMessageSeverity} onCloseAsync={::this.closeFlashMessage}>{this.state.flashMessageText}</DismissibleAlert>)}
                <PageContent structure={this.props.structure}/>
            </div>
        );
    }
}

@translate()
class Section extends Component {
    constructor(props) {
        super(props);

        let structure = props.structure;
        if (typeof structure === 'function') {
            structure = structure(props.t);
        }

        this.structure = structure;
    }

    static propTypes = {
        structure: PropTypes.oneOfType([PropTypes.object, PropTypes.func]).isRequired,
        root: PropTypes.string.isRequired
    }

    render() {
        return (
            <Router>
                <SectionContent root={this.props.root} structure={this.structure} />
            </Router>
        );
    }
}


class Title extends Component {
    render() {
        return (
            <div>
                <h2>{this.props.children}</h2>
                <hr/>
            </div>
        );
    }
}

class Toolbar extends Component {
    render() {
        return (
            <div className="pull-right mt-button-row">
                {this.props.children}
            </div>
        );
    }
}

class NavButton extends Component {
    static propTypes = {
        label: PropTypes.string,
        icon: PropTypes.string,
        className: PropTypes.string,
        linkTo: PropTypes.string
    };

    render() {
        const props = this.props;

        return (
            <Link to={props.linkTo}><Button label={props.label} icon={props.icon} className={props.className}/></Link>
        );
    }
}

class DropdownLink extends Component {
    static propTypes = {
        to: PropTypes.string
    }

    render() {
        const props = this.props;

        return (
            <li><Link to={props.to}>{props.children}</Link></li>
        );
    }
}

function withPageHelpers(target) {
    target = withErrorHandling(target);

    const inst = target.prototype;

    const contextTypes = target.contextTypes || {};

    contextTypes.sectionContent = PropTypes.object.isRequired;

    target.contextTypes = contextTypes;

    inst.getFlashMessageText = function() {
        return this.context.sectionContent.getFlashMessageText();
    };

    inst.getFlashMessageSeverity = function() {
        return this.context.sectionContent.getFlashMessageSeverity();
    };

    inst.setFlashMessage = function(severity, text) {
        return this.context.sectionContent.setFlashMessage(severity, text);
    };

    inst.navigateTo = function(path) {
        return this.context.sectionContent.navigateTo(path);
    }

    inst.navigateBack = function() {
        return this.context.sectionContent.navigateBack();
    }

    inst.navigateToWithFlashMessage = function(path, severity, text) {
        return this.context.sectionContent.navigateToWithFlashMessage(path, severity, text);
    }

    return target;
}

function requiresAuthenticatedUser(target) {
    const comp1 = withPageHelpers(target);

    function comp2(props, context) {
        comp1.call(this, props, context);
        context.sectionContent.ensureAuthenticated();
    }

    comp2.prototype = comp1.prototype;

    for (const attr in comp1) {
        comp2[attr] = comp1[attr];
    }

    return comp2;
}

export {
    Section,
    Title,
    Toolbar,
    NavButton,
    DropdownLink,
    withPageHelpers,
    requiresAuthenticatedUser
};