package option

import (
	"reflect"

	"github.com/sagernet/sing-box/common/json"
	C "github.com/sagernet/sing-box/constant"
	"github.com/sagernet/sing/common"
	E "github.com/sagernet/sing/common/exceptions"
)

type RouteOptions struct {
	GeoIP               *GeoIPOptions   `json:"geoip,omitempty"`
	Geosite             *GeositeOptions `json:"geosite,omitempty"`
	Rules               []Rule          `json:"rules,omitempty"`
	Final               string          `json:"final,omitempty"`
	FindProcess         bool            `json:"find_process,omitempty"`
	AutoDetectInterface bool            `json:"auto_detect_interface,omitempty"`
	DefaultInterface    string          `json:"default_interface,omitempty"`
	DefaultMark         int             `json:"default_mark,omitempty"`
}

type GeoIPOptions struct {
	Path           string `json:"path,omitempty"`
	DownloadURL    string `json:"download_url,omitempty"`
	DownloadDetour string `json:"download_detour,omitempty"`
}

type GeositeOptions struct {
	Path           string `json:"path,omitempty"`
	DownloadURL    string `json:"download_url,omitempty"`
	DownloadDetour string `json:"download_detour,omitempty"`
}

type _Rule struct {
	Type           string      `json:"type,omitempty"`
	DefaultOptions DefaultRule `json:"-"`
	LogicalOptions LogicalRule `json:"-"`
}

type Rule _Rule

func (r Rule) MarshalJSON() ([]byte, error) {
	var v any
	switch r.Type {
	case C.RuleTypeDefault:
		r.Type = ""
		v = r.DefaultOptions
	case C.RuleTypeLogical:
		v = r.LogicalOptions
	default:
		return nil, E.New("unknown rule type: " + r.Type)
	}
	return MarshallObjects((_Rule)(r), v)
}

func (r *Rule) UnmarshalJSON(bytes []byte) error {
	err := json.Unmarshal(bytes, (*_Rule)(r))
	if err != nil {
		return err
	}
	var v any
	switch r.Type {
	case "", C.RuleTypeDefault:
		r.Type = C.RuleTypeDefault
		v = &r.DefaultOptions
	case C.RuleTypeLogical:
		v = &r.LogicalOptions
	default:
		return E.New("unknown rule type: " + r.Type)
	}
	err = UnmarshallExcluded(bytes, (*_Rule)(r), v)
	if err != nil {
		return E.Cause(err, "route rule")
	}
	return nil
}

type DefaultRule struct {
	Inbound         Listable[string] `json:"inbound,omitempty"`
	IPVersion       int              `json:"ip_version,omitempty"`
	Network         string           `json:"network,omitempty"`
	AuthUser        Listable[string] `json:"auth_user,omitempty"`
	Protocol        Listable[string] `json:"protocol,omitempty"`
	Domain          Listable[string] `json:"domain,omitempty"`
	DomainSuffix    Listable[string] `json:"domain_suffix,omitempty"`
	DomainKeyword   Listable[string] `json:"domain_keyword,omitempty"`
	DomainRegex     Listable[string] `json:"domain_regex,omitempty"`
	Geosite         Listable[string] `json:"geosite,omitempty"`
	SourceGeoIP     Listable[string] `json:"source_geoip,omitempty"`
	GeoIP           Listable[string] `json:"geoip,omitempty"`
	SourceIPCIDR    Listable[string] `json:"source_ip_cidr,omitempty"`
	IPCIDR          Listable[string] `json:"ip_cidr,omitempty"`
	SourcePort      Listable[uint16] `json:"source_port,omitempty"`
	SourcePortRange Listable[string] `json:"source_port_range,omitempty"`
	Port            Listable[uint16] `json:"port,omitempty"`
	PortRange       Listable[string] `json:"port_range,omitempty"`
	ProcessName     Listable[string] `json:"process_name,omitempty"`
	PackageName     Listable[string] `json:"package_name,omitempty"`
	User            Listable[string] `json:"user,omitempty"`
	UserID          Listable[int32]  `json:"user_id,omitempty"`
	Invert          bool             `json:"invert,omitempty"`
	Outbound        string           `json:"outbound,omitempty"`
}

func (r DefaultRule) IsValid() bool {
	var defaultValue DefaultRule
	defaultValue.Invert = r.Invert
	defaultValue.Outbound = r.Outbound
	return !reflect.DeepEqual(r, defaultValue)
}

type LogicalRule struct {
	Mode     string        `json:"mode"`
	Rules    []DefaultRule `json:"rules,omitempty"`
	Invert   bool          `json:"invert,omitempty"`
	Outbound string        `json:"outbound,omitempty"`
}

func (r LogicalRule) IsValid() bool {
	return len(r.Rules) > 0 && common.All(r.Rules, DefaultRule.IsValid)
}