package contact

import (
	"errors"
	"regexp"
	"strings"
)

var (
	ErrInvalid   = errors.New("联系人或通道信息不符合要求")
	ErrNotFound  = errors.New("联系人或通道不存在")
	ErrConflict  = errors.New("数据已被其他人员更新，请刷新后重试")
	phonePattern = regexp.MustCompile(`^\+?[0-9]{6,20}$`)
)

type WriteInput struct {
	Name            string `json:"name"`
	Role            string `json:"role"`
	ExpectedVersion int    `json:"expectedVersion"`
}

type ChannelInput struct {
	Kind    string `json:"kind"`
	Address string `json:"address"`
}

func normalizeContact(input WriteInput) (WriteInput, error) {
	input.Name = strings.TrimSpace(input.Name)
	input.Role = strings.TrimSpace(input.Role)
	if input.Name == "" || len([]rune(input.Name)) > 128 || input.Role == "" || len([]rune(input.Role)) > 128 || hasControl(input.Name+input.Role) {
		return WriteInput{}, ErrInvalid
	}
	return input, nil
}

func normalizeChannel(input ChannelInput) (ChannelInput, error) {
	input.Kind = strings.ToLower(strings.TrimSpace(input.Kind))
	input.Address = strings.ReplaceAll(strings.ReplaceAll(strings.TrimSpace(input.Address), " ", ""), "-", "")
	if (input.Kind != "sms" && input.Kind != "voice") || !phonePattern.MatchString(input.Address) {
		return ChannelInput{}, ErrInvalid
	}
	return input, nil
}

func maskAddress(value string) string {
	runes := []rune(value)
	if len(runes) <= 4 {
		return "****"
	}
	return strings.Repeat("*", min(8, len(runes)-4)) + string(runes[len(runes)-4:])
}

func hasControl(value string) bool {
	for _, r := range value {
		if r < 32 || r == 127 {
			return true
		}
	}
	return false
}