import React from 'react';
import _ from 'lodash';

const normalizeUrl = (url: string) => {
    return {
        url,
        shouldReload: true,
    };
};

enum DataType {
    HTML = 'html',
    React = 'react',
}

export interface ModalProps {
    url: string;
    requestData?: object;
    requestType?: 'GET' | 'POST';
    events: Record<string, (data?: string) => void>; // map from event name to callback
    isActive?: boolean;
    onModalClosed: (eventData: string) => void;
}

export interface ModalState {
    type: DataType | null;
    reactComponent: React.ReactNode;
    shouldTemplateFetcherUpdate: boolean;
    normalizedUrl: string;
}

class Modal extends React.Component<ModalProps, ModalState> {
    state: ModalState = {
        type: null,
        reactComponent: null,
        shouldTemplateFetcherUpdate: true,
        normalizedUrl: '',
    };

    componentDidMount() {
        this.handleUrlChanged();
    }

    componentDidUpdate(prevProps: ModalProps) {
        if (prevProps.url !== this.props.url) {
            this.handleUrlChanged();
        }
    }

    componentWillUnmount() {
        // unregister from parent modal
    }

    handleUrlChanged = () => {
        const { url, shouldReload } = normalizeUrl(this.props.url);
        const type = this.getContentType(url);
        this.setState({ type, normalizedUrl: url, shouldTemplateFetcherUpdate: shouldReload });
    };

    getContentType = (url: string) => {
        // If given url exists in router
        if (url) {
            return DataType.React;
        }

        return DataType.HTML;
    };

    close = (eventData: string) => {
        this.props.onModalClosed(eventData);

        if (!_.isUndefined(eventData)) {
            this.triggerEvent('data-received', eventData);
        }
        this.triggerEvent('disposing');
        this.triggerEvent('hide', eventData);
    };

    triggerEvent = (eventName: string, eventData?: string) => {
        this.props.events[eventName](eventData);
    };

    setupEventListeners = () => {
        // ajaxify functionality here
    };

    render() {
        const { type, normalizedUrl, reactComponent, shouldTemplateFetcherUpdate } = this.state;
        if (!type) {
            return 'Loader';
        }

        return type === DataType.React
            ? (
                <div>{reactComponent}</div>
            )
            : (
                <TemplateFetcher url={normalizedUrl} freeezUpdates={!shouldTemplateFetcherUpdate} />
            );
    }
}

export default Modal;