'use client';

import type { CmsFieldType } from '../schema/module.schema';

import { Input } from '@kit/ui/input';
import { Textarea } from '@kit/ui/textarea';
import { Checkbox } from '@kit/ui/checkbox';
import { Label } from '@kit/ui/label';

interface FieldRendererProps {
  name: string;
  displayName: string;
  fieldType: CmsFieldType;
  value: unknown;
  onChange: (value: unknown) => void;
  placeholder?: string;
  helpText?: string;
  required?: boolean;
  readonly?: boolean;
  error?: string;
  selectOptions?: Array<{ label: string; value: string }>;
}

/**
 * Maps cms_field_type to the appropriate Shadcn UI component.
 * Replaces legacy PHP field rendering from my_modulklasse.
 */
export function FieldRenderer({
  name,
  displayName,
  fieldType,
  value,
  onChange,
  placeholder,
  helpText,
  required,
  readonly,
  error,
  selectOptions,
}: FieldRendererProps) {
  const fieldValue = value != null ? String(value) : '';

  const renderField = () => {
    switch (fieldType) {
      case 'text':
      case 'phone':
      case 'url':
      case 'color':
        return (
          <Input
            name={name}
            type={fieldType === 'color' ? 'color' : fieldType === 'url' ? 'url' : fieldType === 'phone' ? 'tel' : 'text'}
            value={fieldValue}
            onChange={(e) => onChange(e.target.value)}
            placeholder={placeholder}
            readOnly={readonly}
            required={required}
          />
        );

      case 'email':
        return (
          <Input
            name={name}
            type="email"
            value={fieldValue}
            onChange={(e) => onChange(e.target.value)}
            placeholder={placeholder ?? 'email@example.de'}
            readOnly={readonly}
            required={required}
          />
        );

      case 'password':
        return (
          <Input
            name={name}
            type="password"
            value={fieldValue}
            onChange={(e) => onChange(e.target.value)}
            placeholder={placeholder}
            readOnly={readonly}
            required={required}
          />
        );

      case 'textarea':
        return (
          <Textarea
            name={name}
            value={fieldValue}
            onChange={(e) => onChange(e.target.value)}
            placeholder={placeholder}
            readOnly={readonly}
            required={required}
            rows={4}
          />
        );

      case 'richtext':
        // Phase 3 enhancement: TipTap editor
        return (
          <Textarea
            name={name}
            value={fieldValue}
            onChange={(e) => onChange(e.target.value)}
            placeholder={placeholder ?? 'Formatierter Text...'}
            readOnly={readonly}
            rows={6}
          />
        );

      case 'integer':
        return (
          <Input
            name={name}
            type="number"
            step="1"
            value={fieldValue}
            onChange={(e) => onChange(parseInt(e.target.value, 10) || '')}
            placeholder={placeholder}
            readOnly={readonly}
            required={required}
          />
        );

      case 'decimal':
      case 'currency':
        return (
          <Input
            name={name}
            type="number"
            step="0.01"
            value={fieldValue}
            onChange={(e) => onChange(parseFloat(e.target.value) || '')}
            placeholder={placeholder ?? (fieldType === 'currency' ? '0,00 €' : undefined)}
            readOnly={readonly}
            required={required}
          />
        );

      case 'date':
        return (
          <Input
            name={name}
            type="date"
            value={fieldValue}
            onChange={(e) => onChange(e.target.value)}
            readOnly={readonly}
            required={required}
          />
        );

      case 'time':
        return (
          <Input
            name={name}
            type="time"
            value={fieldValue}
            onChange={(e) => onChange(e.target.value)}
            readOnly={readonly}
            required={required}
          />
        );

      case 'checkbox':
        return (
          <div className="flex items-center space-x-2">
            <Checkbox
              id={name}
              checked={Boolean(value)}
              onCheckedChange={(checked) => onChange(checked)}
              disabled={readonly}
            />
            <Label htmlFor={name}>{displayName}</Label>
          </div>
        );

      case 'select':
      case 'radio':
        return (
          <select
            name={name}
            value={fieldValue}
            onChange={(e) => onChange(e.target.value)}
            disabled={readonly}
            required={required}
            className="flex h-10 w-full rounded-md border border-input bg-background px-3 py-2 text-sm ring-offset-background"
          >
            <option value="">{placeholder ?? 'Bitte wählen...'}</option>
            {selectOptions?.map((opt) => (
              <option key={opt.value} value={opt.value}>
                {opt.label}
              </option>
            ))}
          </select>
        );

      case 'iban':
        return (
          <Input
            name={name}
            type="text"
            value={fieldValue}
            onChange={(e) => onChange(e.target.value.toUpperCase().replace(/[^A-Z0-9]/g, ''))}
            placeholder={placeholder ?? 'DE89 3704 0044 0532 0130 00'}
            readOnly={readonly}
            required={required}
            maxLength={34}
          />
        );

      case 'file':
        return (
          <Input
            name={name}
            type="file"
            onChange={(e) => {
              const file = e.target.files?.[0];
              if (file) onChange(file);
            }}
            disabled={readonly}
            required={required}
          />
        );

      case 'hidden':
        return <input type="hidden" name={name} value={fieldValue} />;

      case 'computed':
        return (
          <div className="rounded-md border bg-muted px-3 py-2 text-sm">
            {fieldValue || '—'}
          </div>
        );

      default:
        return (
          <Input
            name={name}
            type="text"
            value={fieldValue}
            onChange={(e) => onChange(e.target.value)}
            placeholder={placeholder}
            readOnly={readonly}
          />
        );
    }
  };

  // Checkbox renders its own label
  if (fieldType === 'checkbox') {
    return (
      <div className="space-y-1">
        {renderField()}
        {helpText && <p className="text-xs text-muted-foreground">{helpText}</p>}
        {error && <p className="text-xs text-destructive">{error}</p>}
      </div>
    );
  }

  return (
    <div className="space-y-1.5">
      <Label htmlFor={name}>
        {displayName}
        {required && <span className="text-destructive ml-1">*</span>}
      </Label>
      {renderField()}
      {helpText && <p className="text-xs text-muted-foreground">{helpText}</p>}
      {error && <p className="text-xs text-destructive">{error}</p>}
    </div>
  );
}