/*
 * ribbit-editor.ts — WYSIWYG editing extension for Ribbit.
 */

import { HopDown } from './hopdown';
import { defaultTags, defaultBlockTags, defaultInlineTags, inlineTag } from './tags';
import { defaultTheme } from './default-theme';
import { Ribbit, RibbitPlugin, RibbitSettings, camelCase, decodeHtmlEntities, encodeHtmlEntities } from './ribbit';

/**
 * WYSIWYG markdown editor with VIEW, EDIT, and WYSIWYG modes.
 *
 * Extends Ribbit with contentEditable support and bidirectional
 * markdown↔HTML conversion on mode switches.
 *
 * Usage:
 *   const editor = new RibbitEditor({ editorId: 'my-element' });
 *   editor.run();
 *   editor.wysiwyg();  // switch to WYSIWYG mode
 *   editor.edit();      // switch to source editing mode
 *   editor.view();      // switch to read-only view
 */
export class RibbitEditor extends Ribbit {

    run(): void {
        this.states = {
            VIEW: 'view',
            EDIT: 'edit',
            WYSIWYG: 'wysiwyg'
        };

        this.#bindEvents();
        this.plugins().forEach(plugin => {
            plugin.setEditable();
        });
        this.element.classList.add('loaded');
        this.view();
    }

    #bindEvents(): void {
        this.element.addEventListener('input', () => {
            if (this.state !== this.states.VIEW) {
                this.notifyChange();
            }
        });
    }

    htmlToMarkdown(html?: string): string {
        return this.converter.toMarkdown(html || this.element.innerHTML);
    }

    getMarkdown(): string {
        if (this.getState() === this.states.EDIT) {
            let html = this.element.innerHTML;
            html = html.replace(/<(?:div|br)>/ig, '');
            html = html.replace(/<\/div>/ig, '\n');
            this.cachedMarkdown = decodeHtmlEntities(html);
        } else if (this.getState() === this.states.WYSIWYG) {
            this.cachedMarkdown = this.htmlToMarkdown(this.element.innerHTML);
        }
        if (!this.cachedMarkdown) {
            this.cachedMarkdown = this.element.textContent || '';
        }
        return this.cachedMarkdown;
    }

    wysiwyg(): void {
        if (this.getState() === this.states.WYSIWYG) return;
        this.changed = false;
        this.element.contentEditable = 'true';
        this.element.innerHTML = this.getHTML();
        Array.from(this.element.querySelectorAll('.macro')).forEach(el => {
            const macroEl = el as HTMLElement;
            if (macroEl.dataset.editable === 'false') {
                macroEl.contentEditable = 'false';
                macroEl.style.opacity = '0.5';
            }
        });
        this.setState(this.states.WYSIWYG);
    }

    edit(): void {
        if (!this.theme.features?.sourceMode) {
            return;
        }
        if (this.state === this.states.EDIT) return;
        this.changed = false;
        this.element.contentEditable = 'true';
        this.element.innerHTML = encodeHtmlEntities(this.getMarkdown());
        this.setState(this.states.EDIT);
    }

    insertAtCursor(node: Node): void {
        const sel = window.getSelection()!;
        const range = sel.getRangeAt(0);
        range.deleteContents();
        range.insertNode(node);
        range.setStartAfter(node);
        this.element.focus();
        sel.removeAllRanges();
        sel.addRange(range);
    }
}

// Attach public API to window for <script> tag usage.
(window as any).HopDown = HopDown;
(window as any).inlineTag = inlineTag;
(window as any).defaultTags = defaultTags;
(window as any).defaultBlockTags = defaultBlockTags;
(window as any).defaultInlineTags = defaultInlineTags;
(window as any).defaultTheme = defaultTheme;
(window as any).Ribbit = Ribbit;
(window as any).RibbitEditor = RibbitEditor;
(window as any).RibbitPlugin = RibbitPlugin;
(window as any).camelCase = camelCase;
(window as any).decodeHtmlEntities = decodeHtmlEntities;
(window as any).encodeHtmlEntities = encodeHtmlEntities;