package models

import "time"

// ActiveSession tracks a currently active VPN connection.
type ActiveSession struct {
	ClientIP      string    `json:"client_ip"`      // real public IP of client (from X-Forwarded-For)
	ServerIP      string    `json:"server_ip"`      // VPN server IP they connected to
	NodeID        string    `json:"node_id"`        // catalog node ID
	OS            string    `json:"os"`
	Version       string    `json:"version"`
	ConnectedAt   time.Time `json:"connected_at"`
	LastHeartbeat time.Time `json:"last_seen"`
}

// StudioRecord tracks a studio's home server assignment.
// A studio = all clients sharing the same public IP.
type StudioRecord struct {
	ClientIP       string    `json:"client_ip"`        // public IP = studio identifier
	HomeServerIP   string    `json:"home_server_ip"`   // assigned "home" server
	HomeNodeID     string    `json:"home_node_id"`
	HomeAssignedAt time.Time `json:"home_assigned_at"` // when home was assigned
	TotalClients   int       `json:"total_clients"`    // lifetime client count from this studio
	LastSeen       time.Time `json:"last_seen"`
}

// ConnectRequest is sent when a client connects.
// Server determines client_ip from X-Forwarded-For — no client_ip field needed.
type ConnectRequest struct {
	ServerIP string `json:"server_ip"`
	NodeID   string `json:"node_id"`
	OS       string `json:"os"`
	Version  string `json:"version"`
}

// DisconnectRequest is sent when a client disconnects.
type DisconnectRequest struct {
	ServerIP string `json:"server_ip"`
	NodeID   string `json:"node_id"`
}

// RecommendationResponse is returned by the recommendation endpoint.
type RecommendationResponse struct {
	RecommendedServerIP string `json:"recommended_server_ip"`
	RecommendedNodeID   string `json:"recommended_node_id"`
	RecommendedTag      string `json:"recommended_tag,omitempty"`
	Reason              string `json:"reason"`
	IsRebalance         bool   `json:"is_rebalance"`        // true if recommending different server than home
	LoadInfo            string `json:"load_info"`           // human-readable load summary
	StudioClients       int    `json:"studio_clients"`      // active clients from same studio
}

// ServerLoadInfo contains load data for all servers.
type ServerLoadInfo struct {
	ServerIP       string `json:"server_ip"`
	ActiveClients  int    `json:"active_clients"`
	LoadPercent    int    `json:"load_percent"` // 0-100
	MaxCapacity    int    `json:"max_capacity"`
}