import { Extension } from '@tiptap/core';

/**
 * This extension allows you to align text.
 * @see https://www.tiptap.dev/api/extensions/text-align
 */
const TextAlign = Extension.create({
    name: 'textAlign',
    addOptions() {
        return {
            types: [],
            alignments: ['left', 'center', 'right', 'justify'],
            defaultAlignment: null,
        };
    },
    addGlobalAttributes() {
        return [
            {
                types: this.options.types,
                attributes: {
                    textAlign: {
                        default: this.options.defaultAlignment,
                        parseHTML: element => {
                            const alignment = element.style.textAlign;
                            return this.options.alignments.includes(alignment) ? alignment : this.options.defaultAlignment;
                        },
                        renderHTML: attributes => {
                            if (!attributes.textAlign) {
                                return {};
                            }
                            return { style: `text-align: ${attributes.textAlign}` };
                        },
                    },
                },
            },
        ];
    },
    addCommands() {
        return {
            setTextAlign: (alignment) => ({ commands }) => {
                if (!this.options.alignments.includes(alignment)) {
                    return false;
                }
                return this.options.types
                    .map(type => commands.updateAttributes(type, { textAlign: alignment }))
                    .every(response => response);
            },
            unsetTextAlign: () => ({ commands }) => {
                return this.options.types
                    .map(type => commands.resetAttributes(type, 'textAlign'))
                    .every(response => response);
            },
            toggleTextAlign: alignment => ({ editor, commands }) => {
                if (!this.options.alignments.includes(alignment)) {
                    return false;
                }
                if (editor.isActive({ textAlign: alignment })) {
                    return commands.unsetTextAlign();
                }
                return commands.setTextAlign(alignment);
            },
        };
    },
    addKeyboardShortcuts() {
        return {
            'Mod-Shift-l': () => this.editor.commands.setTextAlign('left'),
            'Mod-Shift-e': () => this.editor.commands.setTextAlign('center'),
            'Mod-Shift-r': () => this.editor.commands.setTextAlign('right'),
            'Mod-Shift-j': () => this.editor.commands.setTextAlign('justify'),
        };
    },
});

export { TextAlign, TextAlign as default };
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