/**
 * JsonEditor - Better UX for JSONB fields
 *
 * Provides syntax highlighting, validation, and error messages
 * instead of raw textarea for JSON editing.
 *
 * Used by: QualityTemplateWizard, CustomerOrderWizard
 */

import React, { useState, useEffect } from 'react';
import { useTranslation } from 'react-i18next';
import { AlertCircle, CheckCircle } from 'lucide-react';

interface JsonEditorProps {
  value: any;
  onChange: (value: any) => void;
  label?: string;
  placeholder?: string;
  required?: boolean;
  rows?: number;
}

export const JsonEditor: React.FC<JsonEditorProps> = ({
  value,
  onChange,
  label,
  placeholder,
  required = false,
  rows = 6,
}) => {
  const { t } = useTranslation('wizards');
  const [jsonString, setJsonString] = useState('');
  const [error, setError] = useState<string | null>(null);
  const [isValid, setIsValid] = useState(true);

  // Initialize from value
  useEffect(() => {
    try {
      if (value === null || value === undefined || value === '') {
        setJsonString('');
      } else if (typeof value === 'string') {
        // Try to parse to validate
        JSON.parse(value);
        setJsonString(value);
      } else {
        setJsonString(JSON.stringify(value, null, 2));
      }
      setIsValid(true);
      setError(null);
    } catch (e) {
      setJsonString(typeof value === 'string' ? value : '');
      setIsValid(false);
    }
  }, []);

  const handleChange = (newValue: string) => {
    setJsonString(newValue);

    // Validate JSON
    if (newValue.trim() === '') {
      setError(null);
      setIsValid(true);
      onChange(null);
      return;
    }

    try {
      const parsed = JSON.parse(newValue);
      setError(null);
      setIsValid(true);
      onChange(parsed);
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Invalid JSON');
      setIsValid(false);
      // Don't update parent with invalid JSON
    }
  };

  const formatJson = () => {
    try {
      const parsed = JSON.parse(jsonString);
      const formatted = JSON.stringify(parsed, null, 2);
      setJsonString(formatted);
      setError(null);
      setIsValid(true);
      onChange(parsed);
    } catch (e) {
      setError(e instanceof Error ? e.message : 'Invalid JSON');
      setIsValid(false);
    }
  };

  return (
    <div>
      {label && (
        <label className="block text-sm font-medium text-[var(--text-secondary)] mb-2">
          {label}
          {required && ' *'}
        </label>
      )}

      <div className="relative">
        <textarea
          value={jsonString}
          onChange={(e) => handleChange(e.target.value)}
          placeholder={placeholder || '{\n  "key": "value"\n}'}
          rows={rows}
          className={`w-full px-3 py-2 border rounded-lg focus:outline-none focus:ring-2 font-mono text-sm ${
            isValid
              ? 'border-[var(--border-secondary)] focus:ring-[var(--color-primary)]'
              : 'border-red-500 focus:ring-red-500'
          } bg-[var(--bg-primary)] text-[var(--text-primary)]`}
        />

        {/* Validation indicator */}
        <div className="absolute top-2 right-2">
          {jsonString && isValid && (
            <CheckCircle className="w-5 h-5 text-green-500" />
          )}
          {jsonString && !isValid && (
            <AlertCircle className="w-5 h-5 text-red-500" />
          )}
        </div>
      </div>

      {/* Error message */}
      {error && (
        <div className="mt-2 flex items-start gap-2 text-sm text-red-600">
          <AlertCircle className="w-4 h-4 mt-0.5 flex-shrink-0" />
          <span>{error}</span>
        </div>
      )}

      {/* Format button */}
      {jsonString && (
        <div className="mt-2">
          <button
            type="button"
            onClick={formatJson}
            className="text-sm px-3 py-1 rounded transition-colors"
            style={{
              backgroundColor: 'var(--bg-tertiary)',
              color: 'var(--text-secondary)',
              border: '1px solid var(--border-secondary)',
            }}
          >
            {t('common.actions.formatJson', 'Format JSON')}
          </button>
        </div>
      )}

      {/* Help text */}
      <p className="mt-2 text-xs" style={{ color: 'var(--text-tertiary)' }}>
        {t('common.hints.jsonEditor', 'Enter valid JSON. Use the format button to auto-format.')}
      </p>
    </div>
  );
};