import Browser from 'mobiledoc-kit/utils/browser';
import Component from '@ember/component';
import {computed} from '@ember/object';
import {formatTextReplacementHtml} from './koenig-text-replacement-html-input';
import {isBlank} from '@ember/utils';
import {run} from '@ember/runloop';
import {set} from '@ember/object';

export default Component.extend({
    // attrs
    payload: null,
    isSelected: false,
    isEditing: false,

    // closure actions
    selectCard() {},
    deselectCard() {},
    editCard() {},
    saveCard() {},
    deleteCard() {},
    moveCursorToNextSection() {},
    moveCursorToPrevSection() {},
    addParagraphAfterCard() {},
    registerComponent() {},

    isEmpty: computed('payload.html', function () {
        return isBlank(this.payload.html);
    }),

    formattedHtml: computed('payload.html', function () {
        return formatTextReplacementHtml(this.payload.html);
    }),

    toolbar: computed('isEditing', function () {
        if (this.isEditing) {
            return false;
        }

        return {
            items: [{
                buttonClass: 'fw4 flex items-center white',
                icon: 'koenig/kg-edit',
                iconClass: 'fill-white',
                title: 'Edit',
                text: '',
                action: run.bind(this, this.editCard)
            }]
        };
    }),

    init() {
        this._super(...arguments);
        this.registerComponent(this);

        if (!this.payload.html) {
            this._updatePayloadAttr('html', '<p>Hey {first_name, "there"},</p>');
        }
    },

    actions: {
        updateHtml(html) {
            this._updatePayloadAttr('html', html);
        },

        registerEditor(textReplacementEditor) {
            let commands = {
                'META+ENTER': run.bind(this, this._enter, 'meta'),
                'CTRL+ENTER': run.bind(this, this._enter, 'ctrl')
            };

            Object.keys(commands).forEach((str) => {
                textReplacementEditor.registerKeyCommand({
                    str,
                    run() {
                        return commands[str](textReplacementEditor, str);
                    }
                });
            });

            this._textReplacementEditor = textReplacementEditor;

            run.scheduleOnce('afterRender', this, this._placeCursorAtEnd);
        },

        leaveEditMode() {
            if (this.isEmpty) {
                // afterRender is required to avoid double modification of `isSelected`
                // TODO: see if there's a way to avoid afterRender
                run.scheduleOnce('afterRender', this, this.deleteCard);
            }
        }
    },

    _updatePayloadAttr(attr, value) {
        let payload = this.payload;
        let save = this.saveCard;

        set(payload, attr, value);

        // update the mobiledoc and stay in edit mode
        save(payload, false);
    },

    /* key commands ----------------------------------------------------------*/

    _enter(modifier) {
        if (this.isEditing && (modifier === 'meta' || (modifier === 'crtl' && Browser.isWin()))) {
            this.editCard();
        }
    },

    _placeCursorAtEnd() {
        if (!this._textReplacementEditor) {
            return;
        }

        let tailPosition = this._textReplacementEditor.post.tailPosition();
        let rangeToSelect = tailPosition.toRange();
        this._textReplacementEditor.selectRange(rangeToSelect);
    }
});