/*
Copyright 2021 Šimon Brandner <simon.bra.ag@gmail.com>

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import React from "react";

import SpellCheckLanguagesDropdown from "../../../components/views/elements/SpellCheckLanguagesDropdown";
import AccessibleButton, { ButtonEvent } from "../../../components/views/elements/AccessibleButton";
import { _t } from "../../../languageHandler";

interface ExistingSpellCheckLanguageIProps {
    language: string;
    onRemoved(language: string): void;
}

interface SpellCheckLanguagesIProps {
    languages: Array<string>;
    onLanguagesChange(languages: Array<string>): void;
}

interface SpellCheckLanguagesIState {
    newLanguage: string;
}

export class ExistingSpellCheckLanguage extends React.Component<ExistingSpellCheckLanguageIProps> {
    private onRemove = (e: ButtonEvent): void => {
        e.stopPropagation();
        e.preventDefault();

        return this.props.onRemoved(this.props.language);
    };

    public render(): React.ReactNode {
        return (
            <div className="mx_ExistingSpellCheckLanguage">
                <span className="mx_ExistingSpellCheckLanguage_language">{this.props.language}</span>
                <AccessibleButton onClick={this.onRemove} kind="danger_sm">
                    {_t("action|remove")}
                </AccessibleButton>
            </div>
        );
    }
}

export default class SpellCheckLanguages extends React.Component<SpellCheckLanguagesIProps, SpellCheckLanguagesIState> {
    public constructor(props: SpellCheckLanguagesIProps) {
        super(props);
        this.state = {
            newLanguage: "",
        };
    }

    private onRemoved = (language: string): void => {
        const languages = this.props.languages.filter((e) => e !== language);
        this.props.onLanguagesChange(languages);
    };

    private onAddClick = (e: ButtonEvent): void => {
        e.stopPropagation();
        e.preventDefault();

        const language = this.state.newLanguage;
        this.setState({ newLanguage: "" });

        if (!language) return;
        if (this.props.languages.includes(language)) return;

        this.props.languages.push(language);
        this.props.onLanguagesChange(this.props.languages);
    };

    private onNewLanguageChange = (language: string): void => {
        if (this.state.newLanguage === language) return;
        this.setState({ newLanguage: language });
    };

    public render(): React.ReactNode {
        const existingSpellCheckLanguages = this.props.languages.map((e) => {
            return <ExistingSpellCheckLanguage language={e} onRemoved={this.onRemoved} key={e} />;
        });

        const addButton = (
            <AccessibleButton onClick={this.onAddClick} kind="primary">
                {_t("action|add")}
            </AccessibleButton>
        );

        return (
            <>
                {existingSpellCheckLanguages}
                <form onSubmit={this.onAddClick} noValidate={true}>
                    <SpellCheckLanguagesDropdown
                        className="mx_GeneralUserSettingsTab_spellCheckLanguageInput"
                        value={this.state.newLanguage}
                        onOptionChange={this.onNewLanguageChange}
                    />
                    {addButton}
                </form>
            </>
        );
    }
}
