package validate

import (
	"regexp"
)

var (
	// EmailRX matches the email-address format accepted by Gardomatic.
	EmailRX = regexp.MustCompile("^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$")
	// ColorRX matches the hexadecimal RGB colors accepted for user colors.
	ColorRX = regexp.MustCompile(`^#[0-9a-fA-F]{6}$`)
)

// Validator collects validation failures keyed by input field.
type Validator struct {
	Errors         map[string]string
	NonFieldErrors []string
	FieldErrors    map[string]string
}

// New returns an empty Validator.
func New() *Validator {
	return &Validator{Errors: make(map[string]string)}
}

// Valid reports whether no validation errors have been recorded.
func (v *Validator) Valid() bool {
	return len(v.Errors) == 0 && len(v.FieldErrors) == 0 && len(v.NonFieldErrors) == 0
}

// AddError records message for key unless key already has an error.
func (v *Validator) AddError(key, message string) {
	if _, exists := v.Errors[key]; !exists {
		v.Errors[key] = message
	}
}

// Check records message for key when ok is false.
func (v *Validator) Check(ok bool, key, message string) {
	if !ok {
		v.AddError(key, message)
	}
}

// AddNonFieldError records an error that is not associated with one field.
func (v *Validator) AddNonFieldError(message string) {
	v.NonFieldErrors = append(v.NonFieldErrors, message)
}

// AddFieldError records a form-specific field error.
func (v *Validator) AddFieldError(key, message string) {

	if v.FieldErrors == nil {
		v.FieldErrors = make(map[string]string)
	}

	if _, exists := v.FieldErrors[key]; !exists {
		v.FieldErrors[key] = message
	}
}

// CheckField records a form-specific field error when ok is false.
func (v *Validator) CheckField(ok bool, key, message string) {
	if !ok {
		v.AddFieldError(key, message)
	}
}