import React from 'react';
import createReactClass from 'create-react-class';
import PropTypes from 'prop-types';
import classNames from 'classnames';

import addUserCatalogMember from '../../../../Models/addUserCatalogMember';
import createCatalogItemFromFileOrUrl from '../../../../Models/createCatalogItemFromFileOrUrl';
import createCatalogMemberFromType from '../../../../Models/createCatalogMemberFromType';
import Dropdown from '../../../Generic/Dropdown';
import FileInput from './FileInput.jsx';
import getDataType from '../../../../Core/getDataType';
import ObserveModelMixin from '../../../ObserveModelMixin';
import TerriaError from '../../../../Core/TerriaError';
import addUserFiles from '../../../../Models/addUserFiles';

import Styles from './add-data.scss';

// Local and remote data have different dataType options
const remoteDataType = getDataType().remoteDataType;
const localDataType = getDataType().localDataType;

/**
 * Add data panel in modal window -> My data tab
 */
const AddData = createReactClass({
    displayName: 'AddData',
    mixins: [ObserveModelMixin],

    propTypes: {
        terria: PropTypes.object,
        viewState: PropTypes.object
    },

    getInitialState() {
        return {
            localDataType: localDataType[0], // By default select the first item (auto)
            remoteDataType: remoteDataType[0],
            activeTab: 'local', // By default local data tab is active
            remoteUrl: '' // By default there's no remote url
        };
    },

    selectLocalOption(option) {
        this.setState({
            localDataType: option
        });
    },

    selectRemoteOption(option) {
        this.setState({
            remoteDataType: option
        });
    },

    changeTab(active) {
        this.setState({
            activeTab: active
        });
    },

    handleUploadFile(e) {
        addUserFiles(e.target.files, this.props.terria, this.props.viewState, this.state.localDataType)
            .then(addedCatalogItems => {
                if (addedCatalogItems.length > 0) {
                    this.onFileAddFinished(addedCatalogItems[0]);
                }
            });

    },

    handleUrl(e) {
        const url = this.state.remoteUrl;
        e.preventDefault();
        this.props.terria.analytics.logEvent('addDataUrl', url);
        const that = this;
        let promise;
        if (that.state.remoteDataType.value === 'auto') {
            promise = loadFile(that);
        } else {
            const newItem = createCatalogMemberFromType(that.state.remoteDataType.value, that.props.terria);
            newItem.name = that.state.remoteUrl;
            newItem.url = that.state.remoteUrl;
            promise = newItem.load().then(function () {
                return newItem;
            });
        }
        addUserCatalogMember(this.props.terria, promise).then(addedItem => {
            if (addedItem && !(addedItem instanceof TerriaError)) {
                this.onFileAddFinished(addedItem);
            }
        });
    },

    onFileAddFinished(fileToSelect) {
        this.props.viewState.myDataIsUploadView = false;
        this.props.viewState.viewCatalogMember(fileToSelect);
    },

    onRemoteUrlChange(event) {
        this.setState({
            remoteUrl: event.target.value
        });
    },

    renderTabs() {
        const tabs = [{
            id: 'local',
            caption: 'Add Local Data'
        }, {
            id: 'web',
            caption: 'Add Web Data'
        }];

        return (
            <ul className={Styles.tabList}>
                <For each="tab" of={tabs}>
                    <li className={Styles.tabListItem} key={tab.id}>
                        <button type='button' onClick={this.changeTab.bind(null, tab.id)}
                                className={classNames(Styles.tabListBtn, {[Styles.isActive]: this.state.activeTab === tab.id})}>
                            {tab.caption}
                        </button>
                    </li>
                </For>
            </ul>
        );
    },

    renderPanels() {
        const dropdownTheme = {
            dropdown: Styles.dropdown,
            list: Styles.dropdownList,
            isOpen: Styles.dropdownListIsOpen
        };

        const dataTypes = localDataType.reduce(function(result, currentDataType) {
            if (currentDataType.extensions) {
                return result.concat(currentDataType.extensions.map(extension => '.' + extension));
            } else {
                return result;
            }
        }, []);

        return (
            <div className={Styles.tabPanels}>
                <If condition={this.state.activeTab === 'local'}>
                    <section className={Styles.tabPanel}>
                        <label className={Styles.label}><strong>Step 1:</strong> Select type of file to add: </label>
                        <Dropdown options={localDataType} selected={this.state.localDataType}
                                  selectOption={this.selectLocalOption} matchWidth={true} theme={dropdownTheme}/>
                        <label className={Styles.label}><strong>Step 2:</strong> Select a local data file to add:
                        </label>
                        <FileInput accept={dataTypes.join(',')} onChange={this.handleUploadFile}/>
                    </section>
                </If>
                <If condition={this.state.activeTab === 'web'}>
                    <section className={Styles.tabPanel}>
                        <label className={Styles.label}><strong>Step 1:</strong> Select type of file to add: </label>
                        <Dropdown options={remoteDataType} selected={this.state.remoteDataType}
                                  selectOption={this.selectRemoteOption} matchWidth={true} theme={dropdownTheme}/>
                        <label className={Styles.label}><strong>Step 2:</strong> Enter the URL of the data file or web
                            service:
                        </label>
                        <form className={Styles.urlInput}>
                            <input value={this.state.remoteUrl} onChange={this.onRemoteUrlChange}
                                   className={Styles.urlInputTextBox}
                                   type='text'
                                   placeholder='e.g. http://data.gov.au/geoserver/wms'/>
                            <button type='submit' onClick={this.handleUrl} className={Styles.urlInputBtn}>
                                Add
                            </button>
                        </form>
                    </section>
                </If>
            </div>
        );
    },

    render() {
        return (
            <div className={Styles.inner}>
                {this.renderTabs()}
                {this.renderPanels()}
            </div>
        );
    },
});

/**
 * Loads a catalog item from a file.
 */
function loadFile(viewModel) {
    return createCatalogItemFromFileOrUrl(viewModel.props.terria, viewModel.props.viewState, viewModel.state.remoteUrl, viewModel.state.remoteDataType.value, true);
}

module.exports = AddData;