import React from 'react';
import { FormattedMessage as Message, injectIntl, IntlShape } from 'react-intl';
import clsx from 'clsx';
import { connect } from 'react-redux';
import { changeLang } from 'app/components/user/actions';
import LANGS from 'app/i18n';
import formStyles from 'app/components/ui/form/form.scss';
import popupStyles from 'app/components/ui/popup/popup.scss';
import icons from 'app/components/ui/icons.scss';

import styles from './languageSwitcher.scss';
import LanguageList from './LanguageList';
import { RootState } from 'app/reducers';

const translateUrl = 'http://ely.by/translate';

export interface LocaleData {
    code: string;
    name: string;
    englishName: string;
    progress: number;
    isReleased: boolean;
}

export type LocalesMap = Record<string, LocaleData>;

type OwnProps = {
    onClose: () => void;
    langs: LocalesMap;
    emptyCaptions: Array<{
        src: string;
        caption: string;
    }>;
};

interface Props extends OwnProps {
    intl: IntlShape;
    selectedLocale: string;
    changeLang: (lang: string) => void;
}

class LanguageSwitcher extends React.Component<
    Props,
    {
        filter: string;
        filteredLangs: LocalesMap;
    }
> {
    state = {
        filter: '',
        filteredLangs: this.props.langs,
    };

    static defaultProps = {
        langs: LANGS,
        onClose() {},
    };

    render() {
        const { selectedLocale, onClose, intl } = this.props;
        const { filteredLangs } = this.state;

        return (
            <div
                className={styles.languageSwitcher}
                data-testid="language-switcher"
                data-e2e-active-locale={selectedLocale}
            >
                <div className={popupStyles.popup}>
                    <div className={popupStyles.header}>
                        <h2 className={popupStyles.headerTitle}>
                            <Message key="siteLanguage" defaultMessage="Site language" />
                        </h2>
                        <span className={clsx(icons.close, popupStyles.close)} onClick={onClose} />
                    </div>

                    <div className={styles.languageSwitcherBody}>
                        <div className={styles.searchBox}>
                            <input
                                className={clsx(formStyles.lightTextField, formStyles.greenTextField)}
                                placeholder={intl.formatMessage({
                                    key: 'startTyping',
                                    defaultMessage: 'Start typing…',
                                })}
                                onChange={this.onFilterUpdate}
                                onKeyPress={this.onFilterKeyPress()}
                                autoFocus
                            />
                            <span className={styles.searchIcon} />
                        </div>

                        <LanguageList
                            selectedLocale={selectedLocale}
                            langs={filteredLangs}
                            onChangeLang={this.onChangeLang}
                        />

                        <div className={styles.improveTranslates}>
                            <div className={styles.improveTranslatesIcon} />
                            <div className={styles.improveTranslatesContent}>
                                <div className={styles.improveTranslatesTitle}>
                                    <Message key="improveTranslates" defaultMessage="Improve Ely.by translation" />
                                </div>
                                <div className={styles.improveTranslatesText}>
                                    <Message
                                        key="improveTranslatesDescription"
                                        defaultMessage="Ely.by’s localization is a community effort. If you want to improve the translation of Ely.by, we'd love your help."
                                    />{' '}
                                    <a href={translateUrl} target="_blank">
                                        <Message
                                            key="improveTranslatesParticipate"
                                            defaultMessage="Click here to participate."
                                        />
                                    </a>
                                </div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        );
    }

    onChangeLang = this.changeLang.bind(this);

    changeLang(lang: string) {
        this.props.changeLang(lang);

        setTimeout(this.props.onClose, 300);
    }

    onFilterUpdate = (event: React.ChangeEvent<HTMLInputElement>) => {
        const filter = event.currentTarget.value.trim().toLowerCase();
        const { langs } = this.props;

        const result = Object.keys(langs).reduce((previous, key) => {
            if (
                langs[key].englishName.toLowerCase().indexOf(filter) === -1 &&
                langs[key].name.toLowerCase().indexOf(filter) === -1
            ) {
                return previous;
            }

            previous[key] = langs[key];

            return previous;
        }, {} as typeof langs);

        this.setState({
            filter,
            filteredLangs: result,
        });
    };

    onFilterKeyPress() {
        return (event: React.KeyboardEvent<HTMLInputElement>) => {
            if (event.key !== 'Enter' || this.state.filter === '') {
                return;
            }

            const locales = Object.keys(this.state.filteredLangs);

            if (locales.length === 0) {
                return;
            }

            this.changeLang(locales[0]);
        };
    }
}

export default injectIntl(
    connect(
        (state: RootState) => ({
            selectedLocale: state.i18n.locale,
        }),
        {
            changeLang,
        },
    )(LanguageSwitcher),
);