// form-components/TextField.tsx (1 of 15+ components)
import { useState, useEffect } from 'react';

interface TextFieldProps {
  label: string;
  value: string;
  onChange: (value: string) => void;
  error?: string;
  required?: boolean;
  placeholder?: string;
  disabled?: boolean;
  minLength?: number;
  maxLength?: number;
  pattern?: RegExp;
  helpText?: string;
}

export function TextField({
  label, value, onChange, error, required,
  placeholder, disabled, minLength, maxLength,
  pattern, helpText
}: TextFieldProps) {
  const [touched, setTouched] = useState(false);
  const [localError, setLocalError] = useState<string>();

  useEffect(() => {
    if (!touched) return;
    if (required && !value) {
      setLocalError(`${label} is required`);
    } else if (minLength && value.length < minLength) {
      setLocalError(`Min ${minLength} characters`);
    } else if (maxLength && value.length > maxLength) {
      setLocalError(`Max ${maxLength} characters`);
    } else if (pattern && !pattern.test(value)) {
      setLocalError('Invalid format');
    } else {
      setLocalError(undefined);
    }
  }, [value, touched, required, minLength, maxLength]);

  return (
    <div className="form-field">
      <label>{label}{required && '*'}</label>
      <input
        type="text"
        value={value}
        onChange={(e) => onChange(e.target.value)}
        onBlur={() => setTouched(true)}
        placeholder={placeholder}
        disabled={disabled}
      />
      {helpText && <span className="help">{helpText}</span>}
      {(error || localError) && (
        <span className="error">{error || localError}</span>
      )}
    </div>
  );
}

// Repeat for: EmailField, PhoneField, SelectField,
// DateField, CheckboxField, RadioField, TextArea,
// NumberField, SliderField, RatingField, FileUpload,
// AutocompleteField, TagsField, SwitchField...

// form-logic/useMultiPageForm.ts
export function useMultiPageForm(config) {
  const [currentPage, setCurrentPage] = useState(0);
  const [formData, setFormData] = useState({});
  const [errors, setErrors] = useState({});
  const [visited, setVisited] = useState(new Set());

  const validatePage = (pageIndex: number) => {
    const pageFields = config.pages[pageIndex].fields;
    const pageErrors = {};
    // ... 50+ lines of validation logic
  };

  const nextPage = () => {
    if (validatePage(currentPage)) {
      setCurrentPage(prev => prev + 1);
    }
  };

  // ... 100+ more lines for prev, submit, etc.
}

// form-logic/conditionalLogic.ts
export function evaluateConditions(conditions, data) {
  // ... 80+ lines of condition evaluation
}

// form-logic/nestedData.ts
export function setNestedValue(obj, path, value) {
  // ... 40+ lines of nested object handling
}

// Plus: API routes, database schemas, error handling,
// accessibility, testing, documentation...

// Total: 2000+ lines across 20+ files
// Time: 2-4 weeks of development

// app/onboarding/page.tsx - THE ENTIRE FORM
import { FormRenderer, FormConfiguration } from '@netpad/forms';

const onboardingForm: FormConfiguration = {
  name: 'Employee Onboarding',
  fieldConfigs: [
    {
      path: 'firstName',
      label: 'First Name',
      type: 'short_text',
      included: true,
      required: true,
      fieldWidth: 'half',
    },
    {
      path: 'email',
      label: 'Email',
      type: 'email',
      included: true,
      required: true,
    },
    {
      path: 'department',
      label: 'Department',
      type: 'dropdown',
      included: true,
      options: [
        { label: 'Engineering', value: 'eng' },
        { label: 'Marketing', value: 'mkt' },
      ],
    },
    {
      path: 'officeLocation',
      label: 'Office',
      type: 'dropdown',
      included: true,
      conditionalLogic: {
        action: 'show',
        conditions: [
          { field: 'workType', operator: 'equals', value: 'hybrid' }
        ],
      },
    },
    {
      path: 'emergencyContact.name',
      label: 'Emergency Contact',
      type: 'short_text',
      included: true,
    },
    {
      path: 'emergencyContact.phone',
      label: 'Contact Phone',
      type: 'phone',
      included: true,
    },
  ],
  multiPage: {
    enabled: true,
    showProgressBar: true,
    pages: [
      { id: 'personal', title: 'Personal', fields: ['firstName', 'email'] },
      { id: 'work', title: 'Employment', fields: ['department', 'officeLocation'] },
      { id: 'emergency', title: 'Emergency', fields: ['emergencyContact.name', 'emergencyContact.phone'] },
    ],
  },
};

export default function OnboardingPage() {
  const handleSubmit = async (data) => {
    await fetch('/api/onboarding', {
      method: 'POST',
      body: JSON.stringify(data),
    });
  };

  return <FormRenderer config={onboardingForm} onSubmit={handleSubmit} />;
}

// That's it. ~80 lines. Ships today.