// components/fixed-editor.js

import React, { useRef, useEffect } from "react";
import { Editor } from "@tinymce/tinymce-react";

function FixedEditor(props) {
  const editorRef = useRef(null);
  const contentRef = useRef(props.initialData || '');
  const onChangeRef = useRef(props.onChange);

  // Update refs when props change
  useEffect(() => {
    onChangeRef.current = props.onChange;
  }, [props.onChange]);

  useEffect(() => {
    if (props.initialData !== undefined && editorRef.current) {
      contentRef.current = props.initialData;
      editorRef.current.setContent(props.initialData);
    }
  }, [props.initialData]);

  const handleInit = (evt, editor) => {
    editorRef.current = editor;
    
    // Set initial content
    if (props.initialData) {
      editor.setContent(props.initialData);
      contentRef.current = props.initialData;
    }

    // Create a debounced onChange handler
    let timeoutId = null;
    const debouncedOnChange = (content) => {
      if (timeoutId) {
        clearTimeout(timeoutId);
      }
      timeoutId = setTimeout(() => {
        if (onChangeRef.current && content !== contentRef.current) {
          contentRef.current = content;
          onChangeRef.current(content);
        }
      }, 100);
    };

    // Handle all content changes
    editor.on('change keyup input paste', (e) => {
      const content = editor.getContent();
      debouncedOnChange(content);
    });

    // Handle undo/redo
    editor.on('Undo Redo', (e) => {
      setTimeout(() => {
        const content = editor.getContent();
        debouncedOnChange(content);
      }, 0);
    });

    // Prevent cursor jumping by handling focus events
    editor.on('focus', (e) => {
      // Save current selection
      editor.lastSelection = editor.selection.getBookmark();
    });

    editor.on('blur', (e) => {
      // Restore selection if available
      if (editor.lastSelection) {
        try {
          editor.selection.moveToBookmark(editor.lastSelection);
        } catch (error) {
          // Ignore bookmark errors
        }
      }
    });

    // Handle key events to prevent jumping
    editor.on('keydown', (e) => {
      // Save selection before any key operation
      editor.lastSelection = editor.selection.getBookmark();
    });

    editor.on('keyup', (e) => {
      // Restore selection after key operation
      if (editor.lastSelection) {
        try {
          editor.selection.moveToBookmark(editor.lastSelection);
        } catch (error) {
          // Ignore bookmark errors
        }
      }
    });
  };

  return (
    <Editor
      onInit={handleInit}
      apiKey={process.env.NEXT_PUBLIC_TINYMCE_API_KEY}
      init={{
        height: 400,
        menubar: false,
        plugins: [
          'advlist', 'autolink', 'lists', 'link', 'image', 'charmap', 'preview',
          'anchor', 'searchreplace', 'visualblocks', 'code', 'fullscreen',
          'insertdatetime', 'media', 'table', 'code', 'help', 'wordcount'
        ],
        toolbar: 'undo redo | blocks | ' +
          'bold italic forecolor | alignleft aligncenter ' +
          'alignright alignjustify | bullist numlist outdent indent | ' +
          'removeformat | table | code | help',
        content_style: `
          body { 
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; 
            font-size: 14px; 
            line-height: 1.6; 
            color: #333; 
          }
          .mce-content-body { 
            padding: 16px; 
            min-height: 368px; 
          }
        `,
        placeholder: 'Start typing...',
        branding: false,
        elementpath: false,
        resize: false,
        statusbar: false,
        // Critical settings for stability
        auto_focus: false,
        forced_root_block: 'p',
        entity_encoding: 'raw',
        keep_styles: true,
        // Disable all problematic features
        verify_html: false,
        cleanup: false,
        cleanup_on_startup: false,
        auto_resize: false,
        // Content handling
        paste_as_text: false,
        paste_enable_default_filters: true,
        paste_word_valid_elements: 'b,strong,i,em,h1,h2,h3,h4,h5,h6',
        paste_retain_style_properties: 'color background-color font-size font-weight',
        // Prevent automatic updates
        element_format: 'html',
        valid_children: '+body[style]',
        extended_valid_elements: 'span[*]',
        custom_elements: '~span',
        // Mobile support
        mobile: {
          theme: 'silver',
          plugins: ['lists', 'autolink', 'link', 'image', 'table'],
          toolbar: 'bold italic | bullist numlist | link image'
        }
      }}
    />
  );
}

export default FixedEditor;