import React, { useState } from 'react';
import { Code, AlertCircle, CheckCircle, Edit3 } from 'lucide-react';
import ToolLayout from '../components/ToolLayout';
import CopyButton from '../components/CopyButton';
import StructuredEditor from '../components/StructuredEditor';

const JsonTool = () => {
  const [input, setInput] = useState('');
  const [output, setOutput] = useState('');
  const [error, setError] = useState('');
  const [isValid, setIsValid] = useState(null);
  const [editorMode, setEditorMode] = useState('text'); // 'text' or 'visual'
  const [structuredData, setStructuredData] = useState({});

  const formatJson = () => {
    try {
      const parsed = JSON.parse(input);
      const formatted = JSON.stringify(parsed, null, 2);
      setOutput(formatted);
      setError('');
      setIsValid(true);
    } catch (err) {
      setError(`Invalid JSON: ${err.message}`);
      setOutput('');
      setIsValid(false);
    }
  };

  const minifyJson = () => {
    try {
      const parsed = JSON.parse(input);
      const minified = JSON.stringify(parsed);
      setOutput(minified);
      setError('');
      setIsValid(true);
    } catch (err) {
      setError(`Invalid JSON: ${err.message}`);
      setOutput('');
      setIsValid(false);
    }
  };

  const validateJson = () => {
    try {
      JSON.parse(input);
      setError('');
      setIsValid(true);
      setOutput('✅ Valid JSON');
    } catch (err) {
      setError(`Invalid JSON: ${err.message}`);
      setIsValid(false);
      setOutput('');
    }
  };

  const clearAll = () => {
    setInput('');
    setOutput('');
    setError('');
    setIsValid(null);
  };

  const handleStructuredDataChange = (newData) => {
    setStructuredData(newData);
    setInput(JSON.stringify(newData, null, 2));
    setError('');
    setIsValid(true);
  };

  const switchToVisualEditor = () => {
    try {
      const parsed = input ? JSON.parse(input) : {};
      setStructuredData(parsed);
      setEditorMode('visual');
      setError('');
      setIsValid(true);
    } catch (err) {
      setError(`Cannot switch to visual editor: ${err.message}`);
      setIsValid(false);
    }
  };

  const switchToTextEditor = () => {
    setEditorMode('text');
  };

  const loadSample = () => {
    const sample = {
      "name": "John Doe",
      "age": 30,
      "email": "john@example.com",
      "address": {
        "street": "123 Main St",
        "city": "New York",
        "zipCode": "10001"
      },
      "hobbies": ["reading", "coding", "traveling"],
      "isActive": true
    };
    setInput(JSON.stringify(sample, null, 2));
    setStructuredData(sample);
  };

  return (
    <ToolLayout
      title="JSON Encoder/Decoder"
      description="Format, validate, and minify JSON data with syntax highlighting"
      icon={Code}
    >
      {/* Editor Mode Toggle */}
      <div className="flex bg-gray-100 dark:bg-gray-800 rounded-lg p-1 mb-6 w-fit">
        <button
          onClick={switchToTextEditor}
          className={`flex items-center space-x-2 px-4 py-2 rounded-md font-medium transition-colors ${
            editorMode === 'text'
              ? 'bg-white dark:bg-gray-700 text-primary-600 shadow-sm'
              : 'text-gray-600 dark:text-gray-400'
          }`}
        >
          <Code className="h-4 w-4" />
          <span>Text Editor</span>
        </button>
        <button
          onClick={switchToVisualEditor}
          className={`flex items-center space-x-2 px-4 py-2 rounded-md font-medium transition-colors ${
            editorMode === 'visual'
              ? 'bg-white dark:bg-gray-700 text-primary-600 shadow-sm'
              : 'text-gray-600 dark:text-gray-400'
          }`}
        >
          <Edit3 className="h-4 w-4" />
          <span>Visual Editor</span>
        </button>
      </div>

      {/* Controls */}
      <div className="flex flex-wrap gap-3 mb-6">
        <button onClick={formatJson} className="tool-button">
          Format JSON
        </button>
        <button onClick={minifyJson} className="tool-button">
          Minify JSON
        </button>
        <button onClick={validateJson} className="tool-button">
          Validate JSON
        </button>
        <button onClick={loadSample} className="tool-button-secondary">
          Load Sample
        </button>
        <button onClick={clearAll} className="tool-button-secondary">
          Clear All
        </button>
      </div>

      {/* Status Indicator */}
      {isValid !== null && (
        <div className={`flex items-center space-x-2 p-3 rounded-md mb-4 ${
          isValid 
            ? 'bg-green-50 dark:bg-green-900/20 text-green-700 dark:text-green-300' 
            : 'bg-red-50 dark:bg-red-900/20 text-red-700 dark:text-red-300'
        }`}>
          {isValid ? (
            <CheckCircle className="h-5 w-5" />
          ) : (
            <AlertCircle className="h-5 w-5" />
          )}
          <span className="font-medium">
            {isValid ? 'Valid JSON' : 'Invalid JSON'}
          </span>
        </div>
      )}

      {/* Error Display */}
      {error && (
        <div className="bg-red-50 dark:bg-red-900/20 border border-red-200 dark:border-red-800 rounded-md p-4 mb-4">
          <div className="flex items-start space-x-2">
            <AlertCircle className="h-5 w-5 text-red-500 mt-0.5" />
            <div>
              <h4 className="text-red-800 dark:text-red-200 font-medium">Error</h4>
              <p className="text-red-700 dark:text-red-300 text-sm mt-1">{error}</p>
            </div>
          </div>
        </div>
      )}

      {/* Input/Output Grid */}
      <div className={`grid gap-6 ${
        editorMode === 'visual' 
          ? 'grid-cols-1' 
          : 'grid-cols-1 lg:grid-cols-2'
      }`}>
        {/* Input */}
        <div className="space-y-2">
          <label className="block text-sm font-medium text-gray-700 dark:text-gray-300">
            {editorMode === 'text' ? 'Input JSON' : 'Visual JSON Editor'}
          </label>
          <div className="relative">
            {editorMode === 'text' ? (
              <textarea
                value={input}
                onChange={(e) => setInput(e.target.value)}
                placeholder="Paste your JSON here..."
                className="tool-input h-96"
              />
            ) : (
              <div className="min-h-96">
                <StructuredEditor
                  initialData={structuredData}
                  onDataChange={handleStructuredDataChange}
                />
              </div>
            )}
          </div>
        </div>

        {/* Output */}
        <div className="space-y-2">
          <label className="block text-sm font-medium text-gray-700 dark:text-gray-300">
            Output
          </label>
          <div className="relative">
            <textarea
              value={output}
              readOnly
              placeholder="Formatted JSON will appear here..."
              className="tool-input h-96 bg-gray-50 dark:bg-gray-800"
            />
            {output && <CopyButton text={output} />}
          </div>
        </div>
      </div>

      {/* Usage Tips */}
      <div className="bg-blue-50 dark:bg-blue-900/20 border border-blue-200 dark:border-blue-800 rounded-md p-4 mt-6">
        <h4 className="text-blue-800 dark:text-blue-200 font-medium mb-2">Usage Tips</h4>
        <ul className="text-blue-700 dark:text-blue-300 text-sm space-y-1">
          <li>• Use "Format JSON" to beautify and indent your JSON</li>
          <li>• Use "Minify JSON" to compress JSON by removing whitespace</li>
          <li>• Use "Validate JSON" to check if your JSON syntax is correct</li>
          <li>• Click the copy button to copy the output to your clipboard</li>
        </ul>
      </div>
    </ToolLayout>
  );
};

export default JsonTool;