package metrics

import (
	"strconv"
	"strings"

	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/promauto"
	"lostak.dev/pve-exporter/proxmox"
)

// PVE cluster state collector.
type PveNodeDiskCollector struct {
	apiClient *proxmox.PveApiClient // PVE API client instance.

	healthy   *prometheus.GaugeVec // Node disk SMART passed state prometheus gauge.
	wearout   *prometheus.GaugeVec // Node disk wearout % prometheus gauge.
	sizeBytes *prometheus.GaugeVec // Node disk size in bytes prometheus gauge.
}

// Create new instance of PVE cluster state collector.
func NewPveNodeDiskCollector(apiClient *proxmox.PveApiClient) *PveNodeDiskCollector {
	c := PveNodeDiskCollector{apiClient: apiClient}

	// Node disk healthy state.
	c.healthy = promauto.NewGaugeVec(
		prometheus.GaugeOpts{
			Name: "pve_node_disk_healthy",
			Help: "Node disk healthy state.",
		},
		[]string{"cluster", "node", "wwn", "type", "model", "serial", "vendor", "used", "osd_id"},
	)

	// Node disk wearout.
	c.wearout = promauto.NewGaugeVec(
		prometheus.GaugeOpts{
			Name: "pve_node_disk_wearout",
			Help: "Node disk wearout percent.",
		},
		[]string{"cluster", "node", "wwn", "type", "model", "serial", "vendor", "used", "osd_id"},
	)

	// Node disk size in bytes.
	c.sizeBytes = promauto.NewGaugeVec(
		prometheus.GaugeOpts{
			Name: "pve_node_disk_size_bytes",
			Help: "Node disk size in bytes.",
		},
		[]string{"cluster", "node", "wwn", "type", "model", "serial", "vendor", "used", "osd_id"},
	)

	return &c
}

// PveMetricsCollector interface implementation.
func (c *PveNodeDiskCollector) CollectMetrics() error {
	cluster, err := c.apiClient.GetClusterStatus()
	if err != nil {
		return err
	}

	c.healthy.Reset()
	c.wearout.Reset()
	c.sizeBytes.Reset()

	for _, node := range cluster.NodeStatuses {
		disks, err := c.apiClient.GetNodeDisksList(node.Name)
		if err != nil {
			return err
		}

		for _, disk := range *disks {
			labels := prometheus.Labels{
				"cluster": cluster.GetClusterName(),
				"node":    node.Name,
				"wwn":     disk.WWN,
				"type":    disk.Type,
				"model":   disk.Model,
				"serial":  disk.Serial,
				"vendor":  strings.TrimSpace(disk.Vendor),
				"used":    disk.Used,
				"osd_id":  strconv.Itoa(disk.OSDID),
			}

			// Disk healthy state.
			c.healthy.With(labels).Set(disk.GetSmartPassedState())

			// Disk wearout %.
			wearout, ok := disk.WearOut.(float64)
			if ok {
				c.wearout.With(labels).Set(wearout)
			}

			// Disk size in bytes.
			c.sizeBytes.With(labels).Set(float64(disk.Size))
		}
	}

	return nil
}

// PveMetricsCollector interface implementation.
func (c *PveNodeDiskCollector) GetName() string {
	return "Node Disks"
}