package service

import (
	"crypto/md5"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"math"
	"strconv"
	"strings"
	"time"
	"xboard-go/internal/database"
	"xboard-go/internal/model"

	"gorm.io/gorm"
)

var serverTypeAliases = map[string]string{
	"v2ray":     "vmess",
	"v2node":    "",
	"hysteria2": "hysteria",
}

var validServerTypes = map[string]struct{}{
	"anytls":      {},
	"http":        {},
	"hysteria":    {},
	"mieru":       {},
	"naive":       {},
	"shadowsocks": {},
	"socks":       {},
	"trojan":      {},
	"tuic":        {},
	"vless":       {},
	"vmess":       {},
}

var shadowsocks2022CipherConfigs = map[string]struct {
	serverKeySize int
	userKeySize   int
}{
	"2022-blake3-aes-128-gcm": {
		serverKeySize: 16,
		userKeySize:   16,
	},
	"2022-blake3-aes-256-gcm": {
		serverKeySize: 32,
		userKeySize:   32,
	},
	"2022-blake3-chacha20-poly1305": {
		serverKeySize: 32,
		userKeySize:   32,
	},
}

type NodeUser struct {
	ID          int    `json:"id"`
	UUID        string `json:"uuid"`
	SpeedLimit  *int   `json:"speed_limit"`
	DeviceLimit *int   `json:"device_limit"`
}

type NodeBaseConfig struct {
	PushInterval int `json:"push_interval"`
	PullInterval int `json:"pull_interval"`
}

type NodeServerConfig struct {
	Name              string              `json:"-"`
	Protocol          string              `json:"protocol"`
	RawHost           string              `json:"-"`
	Port              int                 `json:"-"`
	Ports             string              `json:"-"`
	ListenIP          string              `json:"listen_ip"`
	ServerPort        int                 `json:"server_port"`
	Network           any                 `json:"network"`
	NetworkSettings   any                 `json:"networkSettings"`
	Cipher            any                 `json:"cipher,omitempty"`
	Plugin            any                 `json:"plugin,omitempty"`
	PluginOpts        any                 `json:"plugin_opts,omitempty"`
	ServerKey         any                 `json:"server_key,omitempty"`
	Host              any                 `json:"host,omitempty"`
	ServerName        any                 `json:"server_name,omitempty"`
	Tls               any                 `json:"tls,omitempty"`
	TlsSettings       any                 `json:"tls_settings,omitempty"`
	Flow              any                 `json:"flow,omitempty"`
	Multiplex         any                 `json:"multiplex,omitempty"`
	UTLS              any                 `json:"utls,omitempty"`
	UpMbps            any                 `json:"up_mbps,omitempty"`
	DownMbps          any                 `json:"down_mbps,omitempty"`
	Version           any                 `json:"version,omitempty"`
	Obfs              any                 `json:"obfs,omitempty"`
	ObfsPassword      any                 `json:"obfs-password,omitempty"`
	CongestionControl any                 `json:"congestion_control,omitempty"`
	AuthTimeout       any                 `json:"auth_timeout,omitempty"`
	ZeroRTTHandshake  any                 `json:"zero_rtt_handshake,omitempty"`
	Heartbeat         any                 `json:"heartbeat,omitempty"`
	PaddingScheme     any                 `json:"padding_scheme,omitempty"`
	Transport         any                 `json:"transport,omitempty"`
	TrafficPattern    any                 `json:"traffic_pattern,omitempty"`
	Decryption        any                 `json:"decryption,omitempty"`
	Routes            []model.ServerRoute `json:"routes,omitempty"`
	CustomOutbounds   any                 `json:"custom_outbounds,omitempty"`
	CustomRoutes      any                 `json:"custom_routes,omitempty"`
	CertConfig        any                 `json:"cert_config,omitempty"`
	BaseConfig        NodeBaseConfig      `json:"base_config"`
}

func NormalizeServerType(serverType string) string {
	serverType = strings.ToLower(strings.TrimSpace(serverType))
	if serverType == "" {
		return ""
	}
	if alias, ok := serverTypeAliases[serverType]; ok {
		return alias
	}
	return serverType
}

func IsValidServerType(serverType string) bool {
	normalized := NormalizeServerType(serverType)
	if normalized == "" {
		return true
	}
	_, ok := validServerTypes[normalized]
	return ok
}

func FindServer(nodeID, nodeType string) (*model.Server, error) {
	query := database.DB.Model(&model.Server{})
	if normalized := NormalizeServerType(nodeType); normalized != "" {
		query = query.Where("type = ?", normalized)
	}

	var server model.Server
	if err := query.
		Where("code = ? OR id = ?", nodeID, nodeID).
		Order(gorm.Expr("CASE WHEN code = ? THEN 0 ELSE 1 END", nodeID)).
		First(&server).Error; err != nil {
		return nil, err
	}

	server.Type = NormalizeServerType(server.Type)
	return &server, nil
}

func AvailableUsersForNode(node *model.Server) ([]NodeUser, error) {
	groupIDs := parseIntSlice(node.GroupIDs)
	if len(groupIDs) == 0 {
		return []NodeUser{}, nil
	}

	var users []NodeUser
	err := database.DB.Model(&model.User{}).
		Select("id", "uuid", "speed_limit", "device_limit").
		Where("group_id IN ?", groupIDs).
		Where("u + d < transfer_enable").
		Where("(expired_at >= ? OR expired_at IS NULL)", time.Now().Unix()).
		Where("banned = ?", 0).
		Scan(&users).Error

	if err != nil {
		return []NodeUser{}, err
	}

	return users, nil
}

func AvailableServersForUser(user *model.User) ([]model.Server, error) {
	var servers []model.Server
	if err := database.DB.Where("`show` = ?", 1).Order("sort ASC").Find(&servers).Error; err != nil {
		return nil, err
	}

	filtered := make([]model.Server, 0, len(servers))
	for _, server := range servers {
		groupIDs := parseIntSlice(server.GroupIDs)
		if user.GroupID != nil && len(groupIDs) > 0 && !containsInt(groupIDs, *user.GroupID) {
			continue
		}

		if server.TransferEnable != nil && *server.TransferEnable > 0 && server.U+server.D >= *server.TransferEnable {
			continue
		}

		filtered = append(filtered, server)
	}

	return filtered, nil
}

func GenerateServerPassword(node *model.Server, user *model.User) string {
	if node == nil || user == nil {
		return ""
	}

	if NormalizeServerType(node.Type) != "shadowsocks" {
		return user.UUID
	}

	settings := parseObject(node.ProtocolSettings)
	cipher := getMapString(settings, "cipher")
	config, ok := shadowsocks2022CipherConfigs[cipher]
	if !ok {
		return user.UUID
	}

	createdAt := resolveServerCreatedAt(node)
	serverKey := serverKey(createdAt, config.serverKeySize)
	if serverKey == "" {
		return user.UUID
	}

	return serverKey + ":" + uuidPrefixBase64(user.UUID, config.userKeySize)
}

func CurrentRate(server *model.Server) float64 {
	if !server.RateTimeEnable {
		return float64(server.Rate)
	}

	ranges := parseObjectSlice(server.RateTimeRanges)
	now := time.Now().Format("15:04")
	for _, item := range ranges {
		start, _ := item["start"].(string)
		end, _ := item["end"].(string)
		if start != "" && end != "" && now >= start && now <= end {
			if rate, ok := toFloat64(item["rate"]); ok {
				return rate
			}
		}
	}

	return float64(server.Rate)
}

func BuildNodeConfig(node *model.Server) NodeServerConfig {
	settings := parseObject(node.ProtocolSettings)
	clientPort, portRange := resolveClientPort(node.Port, node.ServerPort)
	response := NodeServerConfig{
		Name:            node.Name,
		Protocol:        node.Type,
		RawHost:         node.Host,
		Port:            clientPort,
		Ports:           portRange,
		ListenIP:        "0.0.0.0",
		ServerPort:      node.ServerPort,
		Network:         getMapAny(settings, "network"),
		NetworkSettings: getMapAny(settings, "network_settings"),
		BaseConfig: NodeBaseConfig{
			PushInterval: MustGetInt("server_push_interval", 60),
			PullInterval: MustGetInt("server_pull_interval", 60),
		},
	}

	switch node.Type {
	case "shadowsocks":
		response.Cipher = getMapString(settings, "cipher")
		response.Plugin = getMapAny(settings, "plugin")
		response.PluginOpts = getMapAny(settings, "plugin_opts")
		cipher := getMapString(settings, "cipher")
		response.ServerKey = ""
		switch cipher {
		case "2022-blake3-aes-128-gcm":
			response.ServerKey = serverKey(node.CreatedAt, 16)
		case "2022-blake3-aes-256-gcm", "2022-blake3-chacha20-poly1305":
			response.ServerKey = serverKey(node.CreatedAt, 32)
		}
	case "vmess":
		response.Tls = getMapInt(settings, "tls")
		response.Multiplex = getMapAny(settings, "multiplex")
		response.UTLS = getMapAny(settings, "utls")
	case "trojan":
		response.Host = node.Host
		response.ServerName = getMapString(settings, "server_name")
		response.Multiplex = getMapAny(settings, "multiplex")
		response.UTLS = getMapAny(settings, "utls")
		response.Tls = getMapInt(settings, "tls")
		if getMapInt(settings, "tls") == 2 {
			response.TlsSettings = getMapAny(settings, "reality_settings")
		} else {
			response.TlsSettings = getMapAny(settings, "tls_settings")
		}
	case "vless":
		response.Tls = getMapInt(settings, "tls")
		response.Flow = getMapString(settings, "flow")
		response.Multiplex = getMapAny(settings, "multiplex")
		response.UTLS = getMapAny(settings, "utls")
		response.Decryption = "none"
		if encryption, ok := settings["encryption"].(map[string]any); ok {
			if enabled, ok := encryption["enabled"].(bool); ok && enabled {
				if dec := stringify(encryption["decryption"]); dec != "" {
					response.Decryption = dec
				}
			}
		}
		if getMapInt(settings, "tls") == 2 {
			response.TlsSettings = getMapAny(settings, "reality_settings")
		} else {
			response.TlsSettings = getMapAny(settings, "tls_settings")
		}
	case "hysteria":
		tls, _ := settings["tls"].(map[string]any)
		obfs, _ := settings["obfs"].(map[string]any)
		bandwidth, _ := settings["bandwidth"].(map[string]any)
		version := getMapInt(settings, "version")
		response.Version = version
		response.Host = node.Host
		response.ServerName = stringify(tls["server_name"])
		response.UpMbps = mapAnyInt(bandwidth, "up")
		response.DownMbps = mapAnyInt(bandwidth, "down")
		response.Obfs = nil
		response.ObfsPassword = nil
		if version == 1 {
			response.Obfs = stringify(obfs["password"])
		} else if version == 2 {
			if open, ok := obfs["open"].(bool); ok && open {
				response.Obfs = stringify(obfs["type"])
				response.ObfsPassword = stringify(obfs["password"])
			}
		}
	case "tuic":
		tls, _ := settings["tls"].(map[string]any)
		response.Version = getMapInt(settings, "version")
		response.ServerName = stringify(tls["server_name"])
		response.CongestionControl = getMapString(settings, "congestion_control")
		response.TlsSettings = getMapAny(settings, "tls_settings")
		response.AuthTimeout = "3s"
		response.ZeroRTTHandshake = false
		response.Heartbeat = "3s"
	case "anytls":
		tls, _ := settings["tls"].(map[string]any)
		response.ServerName = stringify(tls["server_name"])
		response.PaddingScheme = getMapAny(settings, "padding_scheme")
	case "naive", "http":
		response.Tls = getMapInt(settings, "tls")
		response.TlsSettings = getMapAny(settings, "tls_settings")
	case "mieru":
		response.Transport = getMapString(settings, "transport")
		response.TrafficPattern = getMapString(settings, "traffic_pattern")
	}

	response.Routes = nil
	if routeIDs := parseIntSlice(node.RouteIDs); len(routeIDs) > 0 {
		var routes []model.ServerRoute
		if err := database.DB.Select("id", "`match`", "action", "action_value").Where("id IN ?", routeIDs).Find(&routes).Error; err == nil {
			response.Routes = routes
		}
	}
	response.CustomOutbounds = parseGenericJSON(node.CustomOutbounds)
	response.CustomRoutes = parseGenericJSON(node.CustomRoutes)
	response.CertConfig = parseGenericJSON(node.CertConfig)

	return response
}

func BuildNodeConfigPayload(node *model.Server) map[string]any {
	settings := parseObject(node.ProtocolSettings)
	baseConfig := map[string]any{
		"protocol":         node.Type,
		"node_type":        node.Type,
		"nodeType":         node.Type,
		"listen_ip":        "0.0.0.0",
		"server_port":      node.ServerPort,
		"network":          getMapAny(settings, "network"),
		"networkSettings":  getMapAny(settings, "network_settings"),
		"network_settings": getMapAny(settings, "network_settings"),
	}

	response := cloneNodePayload(baseConfig)

	switch node.Type {
	case "shadowsocks":
		response["cipher"] = getMapAny(settings, "cipher")
		response["plugin"] = getMapAny(settings, "plugin")
		response["plugin_opts"] = getMapAny(settings, "plugin_opts")
		switch getMapString(settings, "cipher") {
		case "2022-blake3-aes-128-gcm":
			response["server_key"] = serverKey(node.CreatedAt, 16)
		case "2022-blake3-aes-256-gcm", "2022-blake3-chacha20-poly1305":
			response["server_key"] = serverKey(node.CreatedAt, 32)
		default:
			response["server_key"] = nil
		}
	case "vmess":
		response["tls"] = getMapInt(settings, "tls")
		response["tlsSettings"] = getMapAny(settings, "tls_settings")
		response["multiplex"] = getMapAny(settings, "multiplex")
	case "trojan":
		response["host"] = node.Host
		response["server_name"] = getMapAny(settings, "server_name")
		response["multiplex"] = getMapAny(settings, "multiplex")
		response["tls"] = getMapInt(settings, "tls")
		if getMapInt(settings, "tls") == 2 {
			response["tls_settings"] = getMapAny(settings, "reality_settings")
			response["tlsSettings"] = getMapAny(settings, "reality_settings")
		} else {
			response["tls_settings"] = nil
			response["tlsSettings"] = nil
		}
	case "vless":
		response["tls"] = getMapInt(settings, "tls")
		response["flow"] = getMapString(settings, "flow")
		response["multiplex"] = getMapAny(settings, "multiplex")
		response["decryption"] = nil
		if encryption, ok := settings["encryption"].(map[string]any); ok {
			if enabled, ok := encryption["enabled"].(bool); ok && enabled {
				if dec := stringify(encryption["decryption"]); dec != "" {
					response["decryption"] = dec
				}
			}
		}
		if getMapInt(settings, "tls") == 2 {
			response["tls_settings"] = getMapAny(settings, "reality_settings")
			response["tlsSettings"] = getMapAny(settings, "reality_settings")
		} else {
			response["tls_settings"] = getMapAny(settings, "tls_settings")
			response["tlsSettings"] = getMapAny(settings, "tls_settings")
		}
	case "hysteria":
		tls, _ := settings["tls"].(map[string]any)
		obfs, _ := settings["obfs"].(map[string]any)
		bandwidth, _ := settings["bandwidth"].(map[string]any)
		version := getMapInt(settings, "version")
		response["version"] = version
		response["host"] = node.Host
		response["server_name"] = getMapAny(tls, "server_name")
		response["up_mbps"] = mapAnyInt(bandwidth, "up")
		response["down_mbps"] = mapAnyInt(bandwidth, "down")
		switch version {
		case 1:
			response["obfs"] = getMapAny(obfs, "password")
		case 2:
			if open, ok := obfs["open"].(bool); ok && open {
				response["obfs"] = getMapAny(obfs, "type")
			} else {
				response["obfs"] = nil
			}
			response["obfs-password"] = getMapAny(obfs, "password")
		}
	case "tuic":
		tls, _ := settings["tls"].(map[string]any)
		response["version"] = getMapInt(settings, "version")
		response["server_name"] = getMapAny(tls, "server_name")
		response["congestion_control"] = getMapAny(settings, "congestion_control")
		response["tls_settings"] = getMapAny(settings, "tls_settings")
		response["auth_timeout"] = "3s"
		response["zero_rtt_handshake"] = false
		response["heartbeat"] = "3s"
	case "anytls":
		tls, _ := settings["tls"].(map[string]any)
		response["server_name"] = getMapAny(tls, "server_name")
		response["padding_scheme"] = getMapAny(settings, "padding_scheme")
	case "socks":
		// Base config already matches the original XBoard payload for socks.
	case "naive":
		response["tls"] = getMapInt(settings, "tls")
		response["tls_settings"] = getMapAny(settings, "tls_settings")
		response["tlsSettings"] = getMapAny(settings, "tls_settings")
	case "http":
		response["tls"] = getMapInt(settings, "tls")
		response["tls_settings"] = getMapAny(settings, "tls_settings")
		response["tlsSettings"] = getMapAny(settings, "tls_settings")
	case "mieru":
		transport := getMapString(settings, "transport")
		if strings.TrimSpace(transport) == "" {
			transport = "TCP"
		}
		response["transport"] = transport
		response["traffic_pattern"] = getMapAny(settings, "traffic_pattern")
	}

	if routeIDs := parseIntSlice(node.RouteIDs); len(routeIDs) > 0 {
		var routes []model.ServerRoute
		if err := database.DB.Select("id", "`match`", "action", "action_value").Where("id IN ?", routeIDs).Find(&routes).Error; err == nil {
			response["routes"] = routes
		}
	}

	if customOutbounds := parseGenericJSON(node.CustomOutbounds); hasNodePayloadValue(customOutbounds) {
		response["custom_outbounds"] = customOutbounds
	}
	if customRoutes := parseGenericJSON(node.CustomRoutes); hasNodePayloadValue(customRoutes) {
		response["custom_routes"] = customRoutes
	}
	if certConfig := parseObject(node.CertConfig); len(certConfig) > 0 && getMapString(certConfig, "cert_mode") != "none" {
		response["cert_config"] = certConfig
	}

	return response
}

func BuildNodeBaseConfigPayload() map[string]any {
	return map[string]any{
		"push_interval": MustGetInt("server_push_interval", 60),
		"pull_interval": MustGetInt("server_pull_interval", 60),
	}
}

func cloneNodePayload(values map[string]any) map[string]any {
	result := make(map[string]any, len(values))
	for key, value := range values {
		result[key] = value
	}
	return result
}

func hasNodePayloadValue(value any) bool {
	switch typed := value.(type) {
	case nil:
		return false
	case string:
		return strings.TrimSpace(typed) != ""
	case []any:
		return len(typed) > 0
	case []map[string]any:
		return len(typed) > 0
	case map[string]any:
		return len(typed) > 0
	default:
		return true
	}
}

func ApplyTrafficDelta(userID int, node *model.Server, upload, download int64) {
	rate := CurrentRate(node)
	scaledUpload := int64(math.Round(float64(upload) * rate))
	scaledDownload := int64(math.Round(float64(download) * rate))

	database.DB.Model(&model.User{}).
		Where("id = ?", userID).
		Updates(map[string]any{
			"u": gorm.Expr("u + ?", scaledUpload),
			"d": gorm.Expr("d + ?", scaledDownload),
			"t": time.Now().Unix(),
		})

	database.DB.Model(&model.Server{}).
		Where("id = ?", node.ID).
		Updates(map[string]any{
			"u": gorm.Expr("u + ?", scaledUpload),
			"d": gorm.Expr("d + ?", scaledDownload),
		})
}

func serverKey(createdAt *time.Time, size int) string {
	if createdAt == nil {
		return ""
	}

	// Match XBoard's Helper::getServerKey(created_at, size):
	// base64_encode(substr(md5($timestamp), 0, size))
	// In XBoard, created_at is cast to a Unix timestamp before md5().
	sum := md5.Sum([]byte(strconv.FormatInt(createdAt.Unix(), 10)))
	hex := fmt.Sprintf("%x", sum)
	if size > len(hex) {
		size = len(hex)
	}
	return base64.StdEncoding.EncodeToString([]byte(hex[:size]))
}

func resolveServerCreatedAt(node *model.Server) *time.Time {
	if node == nil {
		return nil
	}

	if node.ParentID == nil || *node.ParentID <= 0 {
		return node.CreatedAt
	}

	var parent struct {
		CreatedAt *time.Time `gorm:"column:created_at"`
	}
	if err := database.DB.Model(&model.Server{}).
		Select("created_at").
		Where("id = ?", *node.ParentID).
		First(&parent).Error; err == nil && parent.CreatedAt != nil {
		return parent.CreatedAt
	}

	return node.CreatedAt
}

func uuidPrefixBase64(uuid string, size int) string {
	if size <= 0 {
		return ""
	}
	if size > len(uuid) {
		size = len(uuid)
	}
	return base64.StdEncoding.EncodeToString([]byte(uuid[:size]))
}

func resolveClientPort(rawPort string, fallback int) (int, string) {
	rawPort = strings.TrimSpace(rawPort)
	if rawPort == "" {
		return fallback, ""
	}

	if strings.Contains(rawPort, "-") {
		parts := strings.SplitN(rawPort, "-", 2)
		start, errStart := strconv.Atoi(strings.TrimSpace(parts[0]))
		end, errEnd := strconv.Atoi(strings.TrimSpace(parts[1]))
		if errStart == nil && errEnd == nil && start > 0 && end >= start {
			if start == end {
				return start, rawPort
			}
			return start + int(time.Now().UnixNano()%int64(end-start+1)), rawPort
		}
	}

	if port, err := strconv.Atoi(rawPort); err == nil && port > 0 {
		return port, ""
	}

	return fallback, ""
}

func parseIntSlice(raw *string) []int {
	if raw == nil || strings.TrimSpace(*raw) == "" {
		return nil
	}

	var decoded []any
	if err := json.Unmarshal([]byte(*raw), &decoded); err == nil {
		result := make([]int, 0, len(decoded))
		for _, item := range decoded {
			if value, ok := toInt(item); ok {
				result = append(result, value)
			}
		}
		return result
	}

	parts := strings.Split(*raw, ",")
	result := make([]int, 0, len(parts))
	for _, part := range parts {
		if value, err := strconv.Atoi(strings.TrimSpace(part)); err == nil {
			result = append(result, value)
		}
	}
	return result
}

func parseObject(raw *string) map[string]any {
	if raw == nil || strings.TrimSpace(*raw) == "" {
		return map[string]any{}
	}
	var decoded map[string]any
	if err := json.Unmarshal([]byte(*raw), &decoded); err != nil {
		return map[string]any{}
	}
	return decoded
}

func parseObjectSlice(raw *string) []map[string]any {
	if raw == nil || strings.TrimSpace(*raw) == "" {
		return nil
	}
	var decoded []map[string]any
	if err := json.Unmarshal([]byte(*raw), &decoded); err != nil {
		return nil
	}
	return decoded
}

func parseGenericJSON(raw *string) any {
	if raw == nil || strings.TrimSpace(*raw) == "" {
		return nil
	}
	var decoded any
	if err := json.Unmarshal([]byte(*raw), &decoded); err != nil {
		return nil
	}
	return decoded
}

func getMapString(values map[string]any, key string) string {
	return stringify(values[key])
}

func getMapInt(values map[string]any, key string) int {
	if value, ok := toInt(values[key]); ok {
		return value
	}
	return 0
}

func getMapAny(values map[string]any, key string) any {
	if value, ok := values[key]; ok {
		return value
	}
	return nil
}

func mapAnyInt(values map[string]any, key string) int {
	if value, ok := toInt(values[key]); ok {
		return value
	}
	return 0
}

func stringify(value any) string {
	switch typed := value.(type) {
	case string:
		return typed
	case fmt.Stringer:
		return typed.String()
	case float64:
		return strconv.FormatInt(int64(typed), 10)
	case int:
		return strconv.Itoa(typed)
	case int64:
		return strconv.FormatInt(typed, 10)
	default:
		return ""
	}
}

func pruneNilMap(values map[string]any) map[string]any {
	result := make(map[string]any, len(values))
	for key, value := range values {
		if value == nil {
			continue
		}
		if text, ok := value.(string); ok && text == "" {
			continue
		}
		result[key] = value
	}
	return result
}

func toInt(value any) (int, bool) {
	switch typed := value.(type) {
	case int:
		return typed, true
	case int64:
		return int(typed), true
	case float64:
		return int(typed), true
	case string:
		parsed, err := strconv.Atoi(strings.TrimSpace(typed))
		return parsed, err == nil
	default:
		return 0, false
	}
}

func toFloat64(value any) (float64, bool) {
	switch typed := value.(type) {
	case float64:
		return typed, true
	case int:
		return float64(typed), true
	case int64:
		return float64(typed), true
	case string:
		parsed, err := strconv.ParseFloat(strings.TrimSpace(typed), 64)
		return parsed, err == nil
	default:
		return 0, false
	}
}

func containsInt(values []int, target int) bool {
	for _, value := range values {
		if value == target {
			return true
		}
	}
	return false
}