package form

import (
	"errors"
	"net/mail"
	"net/url"
	"strconv"
	"time"
)

type Validator struct {
	Valid bool
}

func NewValidator() *Validator {
	return &Validator{true}
}

func (v *Validator) AllOK() bool {
	return v.Valid
}

func (v *Validator) CheckRequiredInput(field *InputField, message string) bool {
	return v.checkInput(field, field.Val != "", message)
}

func (v *Validator) CheckInputMinLength(field *InputField, min int, message string) bool {
	return v.checkInput(field, len(field.Val) >= min, message)
}

func (v *Validator) CheckValidEmailInput(field *InputField, message string) bool {
	_, err := mail.ParseAddress(field.Val)
	return v.checkInput(field, err == nil, message)
}

func (v *Validator) CheckPasswordConfirmation(password *InputField, confirm *InputField, message string) bool {
	return v.checkInput(confirm, password.Val == confirm.Val, message)
}

func (v *Validator) CheckValidURL(field *InputField, message string) bool {
	_, err := url.ParseRequestURI(field.Val)
	return v.checkInput(field, err == nil, message)
}

func (v *Validator) CheckValidDate(field *InputField, message string) bool {
	_, err := time.Parse("2006-01-02", field.Val)
	return v.checkInput(field, err == nil, message)
}

func (v *Validator) CheckValidInteger(field *InputField, min int, max int, message string) bool {
	value, err := strconv.Atoi(field.Val)
	return v.checkInput(field, err == nil && value >= min && value <= max, message)
}

func (v *Validator) CheckValidDecimal(field *InputField, min float64, max float64, message string) bool {
	value, err := strconv.ParseFloat(field.Val, 64)
	return v.checkInput(field, err == nil && value >= min && value <= max, message)
}

func (v *Validator) checkInput(field *InputField, ok bool, message string) bool {
	if !ok {
		field.Errors = append(field.Errors, errors.New(message))
		v.Valid = false
	}
	return ok
}