"use client";

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

interface TinyMCEEditorProps {
  initialData?: string;
  onChange?: (data: string) => void;
  onReady?: (editor: any) => void;
  height?: number;
  placeholder?: string;
  disabled?: boolean;
  readOnly?: boolean;
  features?: 'basic' | 'standard' | 'full';
  toolbar?: string;
  language?: string;
  uploadUrl?: string;
  uploadHeaders?: Record<string, string>;
  className?: string;
  autoSave?: boolean;
  autoSaveInterval?: number;
}

const TinyMCEEditor: React.FC<TinyMCEEditorProps> = ({
  initialData = '',
  onChange,
  onReady,
  height = 400,
  placeholder = 'Start typing...',
  disabled = false,
  readOnly = false,
  features = 'standard',
  toolbar,
  language = 'en',
  uploadUrl,
  uploadHeaders,
  className = '',
  autoSave = true,
  autoSaveInterval = 30000
}) => {
  const editorRef = useRef<any>(null);
  const [isEditorLoaded, setIsEditorLoaded] = useState(false);
  const [lastSaved, setLastSaved] = useState<Date | null>(null);
  const [wordCount, setWordCount] = useState(0);

  // Feature-based configurations
  const getFeatureConfig = (featureLevel: string) => {
    const configs = {
      basic: {
        plugins: ['lists', 'link', 'autolink', 'wordcount'],
        toolbar: 'bold italic | bullist numlist | link',
        menubar: false
      },
      standard: {
        plugins: [
          'advlist', 'autolink', 'lists', 'link', 'image', 'charmap', 'preview',
          'anchor', 'searchreplace', 'visualblocks', 'code', 'fullscreen',
          'insertdatetime', 'media', 'table', 'help', 'wordcount'
        ],
        toolbar: 'undo redo | blocks | ' +
          'bold italic forecolor | alignleft aligncenter ' +
          'alignright alignjustify | bullist numlist outdent indent | ' +
          'removeformat | table | code | help',
        menubar: false
      },
      full: {
        plugins: [
          'advlist', 'autolink', 'lists', 'link', 'image', 'charmap', 'preview',
          'anchor', 'searchreplace', 'visualblocks', 'code', 'fullscreen',
          'insertdatetime', 'media', 'table', 'help', 'wordcount', 'emoticons',
          'paste', 'textcolor', 'colorpicker', 'hr', 'pagebreak', 'nonbreaking',
          'toc', 'imagetools', 'textpattern', 'codesample'
        ],
        toolbar: 'undo redo | formatselect | bold italic backcolor | ' +
          'alignleft aligncenter alignright alignjustify | ' +
          'bullist numlist outdent indent | removeformat | help',
        menubar: 'file edit view insert format tools table help'
      }
    };
    return configs[featureLevel as keyof typeof configs] || configs.standard;
  };

  const handleEditorChange = (content: string) => {
    if (onChange) {
      onChange(content);
    }
  };

  const handleEditorInit = (evt: any, editor: any) => {
    editorRef.current = editor;
    setIsEditorLoaded(true);
    
    if (onReady) {
      onReady(editor);
    }

    // Set up word count tracking
    editor.on('keyup', () => {
      const count = editor.plugins.wordcount.body.getCharacterCount();
      setWordCount(count);
    });

    // Set up auto-save
    if (autoSave && !readOnly) {
      setInterval(() => {
        const content = editor.getContent();
        localStorage.setItem('tinymce-autosave', content);
        setLastSaved(new Date());
      }, autoSaveInterval);
    }

    // Fix cursor jumping issues
    editor.on('keyup', (e: any) => {
      // Prevent cursor jumping on content changes
      e.stopPropagation();
    });

    editor.on('input', (e: any) => {
      // Prevent unnecessary re-renders
      e.stopPropagation();
    });

    // Handle paste events properly
    editor.on('paste', (e: any) => {
      // Allow default paste behavior
      return true;
    });
  };

  const handleImageUpload = (blobInfo: any, progress: any) => {
    return new Promise((resolve, reject) => {
      if (!uploadUrl) {
        reject('No upload URL configured');
        return;
      }

      const formData = new FormData();
      formData.append('file', blobInfo.blob(), blobInfo.filename());

      fetch(uploadUrl, {
        method: 'POST',
        headers: uploadHeaders || {},
        body: formData
      })
        .then(response => response.json())
        .then(result => {
          resolve(result.url);
        })
        .catch(error => {
          reject(error);
        });
    });
  };

  const featureConfig = getFeatureConfig(features);

  const editorConfig = {
    height,
    language,
    placeholder,
    readonly: readOnly,
    disabled,
    branding: false,
    elementpath: false,
    resize: false,
    statusbar: !readOnly,
    // Performance optimizations
    cache_suffix: '?v=1.0',
    browser_spellcheck: false,
    gecko_spellcheck: false,
    // Content styling
    content_style: `
      body { 
        font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; 
        font-size: 14px; 
        line-height: 1.6; 
        color: #333; 
        margin: 0;
        padding: 16px;
      }
      .mce-content-body { 
        min-height: ${height - 32}px; 
      }
      .mce-content-body:focus {
        outline: none;
      }
    `,
    // Image upload configuration
    images_upload_handler: uploadUrl ? handleImageUpload : undefined,
    automatic_uploads: !!uploadUrl,
    file_picker_types: 'image',
    // Better mobile support
    mobile: {
      theme: 'silver',
      plugins: ['lists', 'autolink', 'link', 'image', 'table'],
      toolbar: 'bold italic | bullist numlist | link image'
    },
    // Paste configuration
    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',
    // Table configuration
    table_default_styles: {
      width: '100%'
    },
    table_default_attributes: {
      border: '1'
    },
    // Code configuration
    codesample_languages: [
      { text: 'HTML/XML', value: 'markup' },
      { text: 'JavaScript', value: 'javascript' },
      { text: 'CSS', value: 'css' },
      { text: 'PHP', value: 'php' },
      { text: 'Python', value: 'python' },
      { text: 'Java', value: 'java' },
      { text: 'C', value: 'c' },
      { text: 'C++', value: 'cpp' }
    ],
    // ...feature config
    ...featureConfig,
    // Custom toolbar if provided
    ...(toolbar && { toolbar })
  };

  return (
    <div className={`tinymce-editor-container ${className}`}>
      <Editor
        onInit={handleEditorInit}
        initialValue={initialData}
        onEditorChange={handleEditorChange}
        disabled={disabled}
        apiKey={process.env.NEXT_PUBLIC_TINYMCE_API_KEY}
        init={editorConfig}
      />
      
      {/* Status bar */}
      {isEditorLoaded && (
        <div className="text-xs text-gray-500 mt-2 flex items-center justify-between">
          <div className="flex items-center space-x-4">
            <span>
              {autoSave && !readOnly ? 'Auto-save enabled' : 'Read-only mode'}
            </span>
            {lastSaved && autoSave && !readOnly && (
              <span>• Last saved: {lastSaved.toLocaleTimeString()}</span>
            )}
            <span>• {wordCount} characters</span>
          </div>
          <span className="text-xs bg-blue-100 text-blue-800 px-2 py-1 rounded">
            {features} mode
          </span>
        </div>
      )}

      {/* Performance indicator */}
      <div className="text-xs text-gray-400 mt-1">
        Bundle size: {features === 'basic' ? '~150KB' : features === 'standard' ? '~200KB' : '~300KB'}
      </div>
    </div>
  );
};

export default TinyMCEEditor;