Form Actions

/**
 * Validates entire form programmatically
 * @returns Function to trigger form validation
 */
function useValidateForm(): (opts?: Partial<ValidationOptions>) => Promise<FormValidationResult>;

interface ValidationOptions {
  mode: SchemaValidationMode;
  warn: boolean;
}

type SchemaValidationMode = 'validated-only' | 'silent' | 'force';

/**
 * Validates specific field programmatically
 * @returns Function to trigger field validation
 */
function useValidateField(): <TPath extends Path<any>>(
  path: TPath, 
  opts?: Partial<ValidationOptions>
) => Promise<ValidationResult>;

import { useValidateForm, useValidateField, useForm } from "vee-validate";

const { handleSubmit } = useForm();
const validateForm = useValidateForm();
const validateField = useValidateField();

// Manual form validation
const checkFormValidity = async () => {
  const result = await validateForm();
  
  if (!result.valid) {
    console.log('Form validation failed:', result.errors);
    
    // Focus first invalid field
    const firstErrorField = Object.keys(result.errors)[0];
    if (firstErrorField) {
      document.querySelector(`[name="${firstErrorField}"]`)?.focus();
    }
  } else {
    console.log('Form is valid:', result.values);
  }
  
  return result;
};

// Validate specific field
const checkEmailValidity = async () => {
  const result = await validateField('email');
  
  if (!result.valid) {
    console.log('Email validation failed:', result.errors);
  }
  
  return result;
};

// Validation with different modes
const validateWithMode = async () => {
  // Only validate previously validated fields
  const validatedOnly = await validateForm({ mode: 'validated-only' });
  
  // Validate without updating field states
  const silent = await validateForm({ mode: 'silent' });
  
  // Force validate all fields
  const force = await validateForm({ mode: 'force' });
  
  return { validatedOnly, silent, force };
};

// Progressive validation
const progressiveValidation = async () => {
  const steps = ['email', 'password', 'confirmPassword', 'profile.name'];
  
  for (const step of steps) {
    const result = await validateField(step);
    
    if (!result.valid) {
      console.log(`Validation failed at step: ${step}`, result.errors);
      return { success: false, failedAt: step };
    }
  }
  
  return { success: true };
};

/**
 * Creates form submission handler
 * @returns Function to create submission handler
 */
function useSubmitForm(): <TReturn = unknown>(
  onSubmit?: SubmissionHandler<any, any, TReturn>,
  onInvalidSubmit?: InvalidSubmissionHandler
) => (e?: Event) => Promise<TReturn | undefined>;

type SubmissionHandler<TInput extends GenericObject, TOutput = TInput, TReturn = unknown> = (
  values: TOutput,
  ctx: SubmissionContext<TInput>
) => TReturn;

interface SubmissionContext<TInput extends GenericObject> extends FormActions<TInput> {
  evt?: Event;
  controlledValues: Partial<TInput>;
}

type InvalidSubmissionHandler<TInput extends GenericObject = GenericObject, TOutput extends GenericObject = TInput> = (
  ctx: InvalidSubmissionContext<TInput, TOutput>
) => void;

/**
 * Resets form to initial or specified state
 * @returns Function to reset form
 */
function useResetForm(): (state?: Partial<FormState>, opts?: Partial<ResetFormOpts>) => void;

interface ResetFormOpts {
  force: boolean;
}

/**
 * Gets number of form submission attempts
 * @returns Computed ref to submit count
 */
function useSubmitCount(): ComputedRef<number>;

import { 
  useSubmitForm, 
  useResetForm, 
  useSubmitCount,
  useForm 
} from "vee-validate";

const { handleSubmit } = useForm();
const submitForm = useSubmitForm();
const resetForm = useResetForm();
const submitCount = useSubmitCount();

// Basic form submission
const onSubmit = submitForm(
  async (values) => {
    console.log('Submitting form:', values);
    
    const response = await fetch('/api/submit', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(values)
    });
    
    if (!response.ok) {
      throw new Error('Submission failed');
    }
    
    return response.json();
  },
  ({ errors, results }) => {
    console.log('Form validation failed:', errors);
    console.log('Validation results:', results);
  }
);

// Advanced submission with error handling
const onAdvancedSubmit = submitForm(
  async (values, { setFieldError, setErrors, evt }) => {
    try {
      // Show loading state
      const loadingToast = showToast('Submitting...');
      
      const response = await fetch('/api/submit', {
        method: 'POST',
        body: JSON.stringify(values)
      });
      
      const result = await response.json();
      
      if (!response.ok) {
        // Handle server validation errors
        if (result.fieldErrors) {
          Object.entries(result.fieldErrors).forEach(([field, error]) => {
            setFieldError(field, error as string);
          });
        } else {
          setFieldError('', result.message || 'Submission failed');
        }
        
        hideToast(loadingToast);
        return;
      }
      
      // Success
      hideToast(loadingToast);
      showToast('Form submitted successfully!');
      
      return result;
      
    } catch (error) {
      console.error('Submission error:', error);
      setFieldError('', 'Network error. Please try again.');
    }
  },
  ({ errors, values, evt }) => {
    // Handle client-side validation failures
    const errorCount = Object.keys(errors).length;
    showToast(`Please fix ${errorCount} validation error(s)`);
    
    // Focus first error field
    const firstErrorField = Object.keys(errors)[0];
    if (firstErrorField) {
      document.querySelector(`[name="${firstErrorField}"]`)?.focus();
    }
  }
);

// Form reset actions
const resetToDefault = () => {
  resetForm();
};

const resetWithCustomValues = () => {
  resetForm({
    values: {
      name: 'Default Name',
      email: '',
      phone: ''
    },
    errors: {},
    touched: {}
  });
};

const forceReset = () => {
  resetForm(undefined, { force: true });
};

// Submit count tracking
const submitAttempts = computed(() => {
  const count = submitCount.value;
  if (count === 0) return 'No attempts yet';
  if (count === 1) return '1 attempt';
  if (count > 5) return `${count} attempts (consider assistance)`;
  return `${count} attempts`;
});

// Retry logic based on submit count
const handleRetrySubmit = () => {
  const attempts = submitCount.value;
  
  if (attempts >= 3) {
    showConfirmDialog({
      title: 'Multiple Failed Attempts',
      message: 'You have tried to submit this form multiple times. Would you like to reset and start over?',
      onConfirm: () => resetForm(),
      onCancel: () => onSubmit()
    });
  } else {
    onSubmit();
  }
};

/**
 * Programmatically set field value
 * @returns Function to set field value
 */
function useSetFieldValue(): (path: string, value: any, shouldValidate?: boolean) => void;

/**
 * Programmatically set field error
 * @returns Function to set field error
 */
function useSetFieldError(): (path: string, message: string | string[]) => void;

/**
 * Programmatically set field touched state
 * @returns Function to set field touched state
 */
function useSetFieldTouched(): (path: string, isTouched: boolean) => void;

/**
 * Programmatically set multiple field values
 * @returns Function to set form values
 */
function useSetFormValues(): (values: Record<string, any>, shouldValidate?: boolean) => void;

/**
 * Programmatically set multiple field errors
 * @returns Function to set form errors
 */
function useSetFormErrors(): (errors: Record<string, string | string[] | undefined>) => void;

/**
 * Programmatically set multiple field touched states
 * @returns Function to set form touched states
 */
function useSetFormTouched(): (touched: Record<string, boolean> | boolean) => void;

import { 
  useSetFieldValue,
  useSetFieldError,
  useSetFieldTouched,
  useSetFormValues,
  useSetFormErrors,
  useSetFormTouched,
  useForm
} from "vee-validate";

const { handleSubmit } = useForm();
const setFieldValue = useSetFieldValue();
const setFieldError = useSetFieldError();
const setFieldTouched = useSetFieldTouched();
const setFormValues = useSetFormValues();
const setFormErrors = useSetFormErrors();
const setFormTouched = useSetFormTouched();

// Individual field mutations
const updateUserEmail = (email: string) => {
  setFieldValue('email', email, true); // true = trigger validation
  setFieldTouched('email', true);
};

const markEmailAsInvalid = (errorMessage: string) => {
  setFieldError('email', errorMessage);
  setFieldTouched('email', true);
};

// Bulk form mutations
const loadUserData = (userData: any) => {
  setFormValues({
    name: userData.name,
    email: userData.email,
    phone: userData.phone,
    address: {
      street: userData.address?.street || '',
      city: userData.address?.city || '',
      zipCode: userData.address?.zipCode || ''
    }
  }, false); // false = don't trigger validation
};

const handleServerValidationErrors = (serverErrors: Record<string, string>) => {
  // Set multiple field errors from server response
  setFormErrors(serverErrors);
  
  // Mark all error fields as touched
  const touchedState: Record<string, boolean> = {};
  Object.keys(serverErrors).forEach(field => {
    touchedState[field] = true;
  });
  setFormTouched(touchedState);
};

// Form state management patterns
const clearAllErrors = () => {
  setFormErrors({});
};

const markAllFieldsAsTouched = () => {
  setFormTouched(true); // true = mark all fields as touched
};

const resetFieldStates = () => {
  setFormErrors({});
  setFormTouched(false); // false = mark all fields as untouched
};

// Conditional field updates
const handleCountryChange = (country: string) => {
  setFieldValue('country', country);
  
  // Clear dependent fields when country changes
  if (country === 'US') {
    setFieldValue('state', '');
    setFieldValue('zipCode', '');
  } else {
    setFieldValue('province', '');
    setFieldValue('postalCode', '');
  }
};

// Auto-save functionality
const autoSaveForm = debounce(async (values: any) => {
  try {
    await fetch('/api/autosave', {
      method: 'POST',
      body: JSON.stringify(values)
    });
    
    setFieldError('', ''); // Clear any previous save errors
  } catch (error) {
    setFieldError('', 'Auto-save failed');
  }
}, 1000);

// Dynamic field validation
const validateFieldDependencies = async (changedField: string, value: any) => {
  if (changedField === 'password') {
    // Re-validate password confirmation when password changes
    const confirmPassword = formValues.confirmPassword;
    if (confirmPassword) {
      if (confirmPassword !== value) {
        setFieldError('confirmPassword', 'Passwords do not match');
      } else {
        setFieldError('confirmPassword', '');
      }
    }
  }
  
  if (changedField === 'email') {
    // Check email availability
    try {
      const response = await fetch(`/api/check-email?email=${value}`);
      const { available } = await response.json();
      
      if (!available) {
        setFieldError('email', 'This email is already taken');
      } else {
        setFieldError('email', '');
      }
    } catch (error) {
      setFieldError('email', 'Unable to verify email availability');
    }
  }
};

import { 
  useSubmitForm, 
  useSetFormErrors, 
  useSetFormValues,
  useResetForm 
} from "vee-validate";

const submitForm = useSubmitForm();
const setFormErrors = useSetFormErrors();
const setFormValues = useSetFormValues();
const resetForm = useResetForm();

// API submission with error handling
const handleApiSubmission = submitForm(
  async (values, { setFieldError }) => {
    const response = await fetch('/api/users', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(values)
    });
    
    const result = await response.json();
    
    if (!response.ok) {
      // Handle different error types
      if (response.status === 422) {
        // Validation errors
        setFormErrors(result.errors);
      } else if (response.status === 409) {
        // Conflict errors (e.g., duplicate email)
        setFieldError('email', result.message);
      } else {
        // General errors
        setFieldError('', 'Submission failed. Please try again.');
      }
      throw new Error('Submission failed');
    }
    
    // Success - reset form or redirect
    resetForm();
    return result;
  }
);

// Load data from API
const loadUserData = async (userId: string) => {
  try {
    const response = await fetch(`/api/users/${userId}`);
    const userData = await response.json();
    
    setFormValues(userData, false); // Don't trigger validation on load
  } catch (error) {
    setFormErrors({ '': 'Failed to load user data' });
  }
};

const currentStep = ref(0);
const steps = ['personal', 'contact', 'preferences', 'review'];

const validateForm = useValidateForm();
const setFormTouched = useSetFormTouched();

const goToNextStep = async () => {
  // Validate current step
  const currentStepFields = getFieldsForStep(currentStep.value);
  const isStepValid = await validateStepFields(currentStepFields);
  
  if (isStepValid) {
    currentStep.value++;
    saveStepProgress();
  } else {
    // Mark fields as touched to show errors
    const touchedFields: Record<string, boolean> = {};
    currentStepFields.forEach(field => {
      touchedFields[field] = true;
    });
    setFormTouched(touchedFields);
  }
};

const goToPreviousStep = () => {
  if (currentStep.value > 0) {
    currentStep.value--;
  }
};

const validateStepFields = async (fields: string[]) => {
  for (const field of fields) {
    const result = await validateField(field);
    if (!result.valid) {
      return false;
    }
  }
  return true;
};

const saveStepProgress = () => {
  localStorage.setItem('formProgress', JSON.stringify({
    step: currentStep.value,
    values: formValues.value
  }));
};