package domain

import (
	"errors"
	"fmt"

	"github.com/gosimple/slug"
)

type ValidationError struct {
	Field string
	Err   error
}

var _ ErrorWithParams = ValidationError{}

func (e ValidationError) Error() string {
	return fmt.Sprintf("%s: %s", e.Field, e.Err)
}

func (e ValidationError) Code() ErrorCode {
	var domainErr Error
	if errors.As(e.Err, &domainErr) {
		return domainErr.Code()
	}
	return ErrorCodeIncorrectInput
}

func (e ValidationError) Slug() string {
	s := "validation"
	var domainErr Error
	if errors.As(e.Err, &domainErr) {
		s = domainErr.Slug()
	}
	return fmt.Sprintf("%s-%s", slug.Make(e.Field), s)
}

func (e ValidationError) Params() map[string]any {
	var withParams ErrorWithParams
	ok := errors.As(e.Err, &withParams)
	if !ok {
		return nil
	}
	return withParams.Params()
}

type MinGreaterEqualError struct {
	Min     int
	Current int
}

var _ ErrorWithParams = MinGreaterEqualError{}

func (e MinGreaterEqualError) Error() string {
	return fmt.Sprintf("must be no less than %d (current: %d)", e.Min, e.Current)
}

func (e MinGreaterEqualError) Code() ErrorCode {
	return ErrorCodeIncorrectInput
}

func (e MinGreaterEqualError) Slug() string {
	return "min-greater-equal"
}

func (e MinGreaterEqualError) Params() map[string]any {
	return map[string]any{
		"Min":     e.Min,
		"Current": e.Current,
	}
}

type MaxLessEqualError struct {
	Max     int
	Current int
}

var _ ErrorWithParams = MaxLessEqualError{}

func (e MaxLessEqualError) Error() string {
	return fmt.Sprintf("must be no greater than %d (current: %d)", e.Max, e.Current)
}

func (e MaxLessEqualError) Code() ErrorCode {
	return ErrorCodeIncorrectInput
}

func (e MaxLessEqualError) Slug() string {
	return "max-less-equal"
}

func (e MaxLessEqualError) Params() map[string]any {
	return map[string]any{
		"Max":     e.Max,
		"Current": e.Current,
	}
}

type LenOutOfRangeError struct {
	Min     int
	Max     int
	Current int
}

var _ ErrorWithParams = LenOutOfRangeError{}

func (e LenOutOfRangeError) Error() string {
	return fmt.Sprintf("length must be between %d and %d (current length: %d)", e.Min, e.Max, e.Current)
}

func (e LenOutOfRangeError) Code() ErrorCode {
	return ErrorCodeIncorrectInput
}

func (e LenOutOfRangeError) Slug() string {
	return "length-out-of-range"
}

func (e LenOutOfRangeError) Params() map[string]any {
	return map[string]any{
		"Min":     e.Min,
		"Max":     e.Max,
		"Current": e.Current,
	}
}

func validateSliceLen[S ~[]E, E any](s S, min, max int) error {
	if l := len(s); l > max || l < min {
		return LenOutOfRangeError{
			Min:     min,
			Max:     max,
			Current: l,
		}
	}

	return nil
}

const (
	serverKeyMinLength = 1
	serverKeyMaxLength = 10
)

func validateServerKey(key string) error {
	if l := len(key); l < serverKeyMinLength || l > serverKeyMaxLength {
		return LenOutOfRangeError{
			Min:     serverKeyMinLength,
			Max:     serverKeyMaxLength,
			Current: l,
		}
	}

	return nil
}

const (
	versionCodeMinLength = 2
	versionCodeMaxLength = 2
)

func validateVersionCode(code string) error {
	if l := len(code); l < versionCodeMinLength || l > versionCodeMaxLength {
		return LenOutOfRangeError{
			Min:     versionCodeMinLength,
			Max:     versionCodeMaxLength,
			Current: l,
		}
	}

	return nil
}