import { insertText } from '../../utils/Utils';
import ListStyle from '../ListStyle';
import Plugin from '../Plugin';

import icon from './icon.svg';

export default class OrderedList extends Plugin {
    getKey(): string {
        return 'ordered-list';
    }

    getIcon(): string {
        return icon;
    }

    getTitle(): string {
        return 'Ordered List (Ctrl+Alt+7)';
    }

    onKeyDown(event: KeyboardEvent): void {
        if (event.ctrlKey && event.altKey && event.key === '7') {
            event.preventDefault();
            this.execute();
        }

        if (event.key === 'Enter') {
            // Check if previous line is a list item
            const textarea = this.editor.textarea;
            if (!this.editor.textarea) return;

            const line = textarea.value.slice(0, textarea.selectionStart).split('\n').pop();
            // If the previous line is a list item, then we want to add a list item
            if (
                line &&
                line.match(/^\d+\. /g)?.length &&
                line.trim().length > line.match(/^\d+\. /g).pop().length
            ) {
                event.preventDefault();
                let lastNumber = line.match(/^\d+\. /g).pop();

                let text = `\n${parseInt(lastNumber) + 1}. `;

                insertText(textarea, {
                    text,
                    selectionStart: textarea.selectionStart + text.length,
                    selectionEnd: textarea.selectionStart + text.length,
                });
            }

            // If the current line is an empty list item, then we want to remove the list item
            else if (
                line &&
                line.match(/^\d+\. /g)?.length &&
                line.trim().length ===
                    line
                        .match(/^\d+\. /g)
                        .pop()
                        .trim().length
            ) {
                event.preventDefault();

                textarea.selectionStart -= line.match(/^\d+\. /g).pop().length;
                insertText(textarea, {
                    text: '',
                    selectionStart: textarea.selectionStart,
                    selectionEnd: textarea.selectionStart,
                });
            }
        }
    }

    execute(value: string = ''): void {
        if (!this.editor.textarea) return;
        const textarea = this.editor.textarea;

        ListStyle.applyStyle(textarea, { prefix: '1. ', orderedList: true });
    }
}