package fieldgroups

import (
	"fmt"

	"pdf-wizard/internal/models"
)

// ConditionalHandler handles groups where a checkbox (typically "Other") is
// paired with one or more text fields. The text fields are required when the
// checkbox is selected.
type ConditionalHandler struct{}

func init() {
	Register(ConditionalHandler{})
}

func (ConditionalHandler) Type() string {
	return "conditional_other"
}

func (ConditionalHandler) Validate(fields []models.FormField, fieldValues map[int]string) error {
	var checkboxChecked bool
	var textFields []models.FormField

	for _, f := range fields {
		if f.Type == "button" {
			if v, ok := fieldValues[f.ID]; ok && v == "1" {
				checkboxChecked = true
			}
		} else {
			textFields = append(textFields, f)
		}
	}

	if !checkboxChecked {
		return nil
	}

	// Text fields are required when checkbox is checked
	for _, f := range textFields {
		if v, ok := fieldValues[f.ID]; !ok || v == "" {
			return fmt.Errorf("field '%s' is required when 'Other' is selected", f.FieldName)
		}
	}
	return nil
}

func (ConditionalHandler) ConvertToFillValues(fields []models.FormField, fieldValues map[int]string) map[int]string {
	result := make(map[int]string)
	for _, f := range fields {
		if v, ok := fieldValues[f.ID]; ok {
			result[f.ID] = v
		} else {
			result[f.ID] = ""
		}
	}
	return result
}