package platform

import "time"

// LiveMetricSample is a single point-in-time snapshot of server metrics
// collected for the web UI metrics page.
type LiveMetricSample struct {
	Timestamp time.Time       `json:"ts"`
	Fans      []FanReading    `json:"fans"`
	Temps     []TempReading   `json:"temps"`
	PowerW    float64         `json:"power_w"`
	GPUs      []GPUMetricRow  `json:"gpus"`
}

// TempReading is a named temperature sensor value.
type TempReading struct {
	Name    string  `json:"name"`
	Celsius float64 `json:"celsius"`
}

// SampleLiveMetrics collects a single metrics snapshot from all available
// sources: GPU (via nvidia-smi), fans and temperatures (via ipmitool/sensors),
// and system power (via ipmitool dcmi). Missing sources are silently skipped.
func SampleLiveMetrics() LiveMetricSample {
	s := LiveMetricSample{Timestamp: time.Now().UTC()}

	// GPU metrics — skipped silently if nvidia-smi unavailable
	gpus, _ := SampleGPUMetrics(nil)
	s.GPUs = gpus

	// Fan speeds — skipped silently if ipmitool unavailable
	fans, _ := sampleFanSpeeds()
	s.Fans = fans

	// CPU/system temperature — returns 0 if unavailable
	cpuTemp := sampleCPUMaxTemp()
	if cpuTemp > 0 {
		s.Temps = append(s.Temps, TempReading{Name: "CPU", Celsius: cpuTemp})
	}

	// System power — returns 0 if unavailable
	s.PowerW = sampleSystemPower()

	return s
}