package protocol

import (
	"fmt"
	"time"
)

// HubStatusPayload holds a hub snapshot, not house state. ID matches the hub
// topic. Status is ready or unavailable. ExpiresAt is required in its envelope.
// Address is runtime data and must not be written to logs.
type HubStatusPayload struct {
	ID                string          `json:"id"`
	Alias             string          `json:"alias,omitempty"`
	Address           string          `json:"address"`
	Status            string          `json:"status"`
	Error             string          `json:"error,omitempty"`
	Model             string          `json:"model,omitempty"`
	Firmware          string          `json:"firmware,omitempty"`
	EventStream       bool            `json:"event_stream"`
	UpdatedAt         *time.Time      `json:"updated_at,omitempty"`
	Pairing           *HubPairing     `json:"pairing,omitempty"`
	ConfiguredDevices int             `json:"configured_devices"`
	PairedDevices     *int            `json:"paired_devices,omitempty"`
	Diagnostics       *HubDiagnostics `json:"diagnostics,omitempty"`
	DiagnosticsError  string          `json:"diagnostics_error,omitempty"`
}

// HubPairing describes one request to permit device joining.
type HubPairing struct {
	Status          string    `json:"status"`
	DurationSeconds int       `json:"duration_seconds"`
	RequestedAt     time.Time `json:"requested_at"`
	Deadline        time.Time `json:"deadline"`
	Error           string    `json:"error,omitempty"`
}

// HubDiagnostics holds a source sample. Repeated publications preserve
// ObservedAt and Stale. Optional measurements remain absent when unknown.
type HubDiagnostics struct {
	ObservedAt              time.Time `json:"observed_at"`
	Stale                   bool      `json:"stale"`
	Hostname                string    `json:"hostname,omitempty"`
	IPAddress               string    `json:"ip_address,omitempty"`
	MAC                     string    `json:"mac,omitempty"`
	RadioChip               string    `json:"radio_chip,omitempty"`
	RadioFirmware           string    `json:"radio_firmware,omitempty"`
	UptimeSeconds           *uint64   `json:"uptime_seconds,omitempty"`
	TemperatureCelsius      *float64  `json:"temperature_celsius,omitempty"`
	RadioTemperatureCelsius *float64  `json:"radio_temperature_celsius,omitempty"`
	RAMUsedPercent          *float64  `json:"ram_used_percent,omitempty"`
	PSRAMUsedPercent        *float64  `json:"psram_used_percent,omitempty"`
	StorageUsedPercent      *float64  `json:"storage_used_percent,omitempty"`
	EthernetConnected       *bool     `json:"ethernet_connected,omitempty"`
	WiFiConnected           *bool     `json:"wifi_connected,omitempty"`
}

// HubStatusLifetime bounds retained hub status to two polls plus 50 seconds. A
// nonpositive poll interval is invalid.
func HubStatusLifetime(pollInterval time.Duration) (time.Duration, error) {
	if pollInterval <= 0 || pollInterval > (time.Duration(1<<63-1)-50*time.Second)/2 {
		return 0, fmt.Errorf("hub poll interval is outside the supported range")
	}

	return 2*pollInterval + 50*time.Second, nil
}