package collector

import (
	"context"
	"fmt"
	"log"
	"time"

	"gitea.sinav-lab.com/sinav/keenetic-exporter-v2/internal/device"
	"gitea.sinav-lab.com/sinav/keenetic-exporter-v2/internal/keenetic"
	"github.com/prometheus/client_golang/prometheus"
)

type InterfaceStatsCollector struct {
	rxBytesDesc     *prometheus.Desc
	txBytesDesc     *prometheus.Desc
	rxPacketsDesc   *prometheus.Desc
	txPacketsDesc   *prometheus.Desc
	rxErrorsDesc    *prometheus.Desc
	txErrorsDesc    *prometheus.Desc
	rxDroppedDesc   *prometheus.Desc
	txDroppedDesc   *prometheus.Desc
	rxBroadcastDesc *prometheus.Desc
	txBroadcastDesc *prometheus.Desc
	rxMulticastDesc *prometheus.Desc
	txMulticastDesc *prometheus.Desc
	rxSpeedBpsDesc  *prometheus.Desc
	txSpeedBpsDesc  *prometheus.Desc
}

func NewInterfaceStatsCollector() *InterfaceStatsCollector {
	labels := []string{"device", "interface"}
	return &InterfaceStatsCollector{
		rxBytesDesc:     prometheus.NewDesc("keenetic_interface_rx_bytes", "Received bytes", labels, nil),
		txBytesDesc:     prometheus.NewDesc("keenetic_interface_tx_bytes", "Transmitted bytes", labels, nil),
		rxPacketsDesc:   prometheus.NewDesc("keenetic_interface_rx_packets", "Received packets", labels, nil),
		txPacketsDesc:   prometheus.NewDesc("keenetic_interface_tx_packets", "Transmitted packets", labels, nil),
		rxErrorsDesc:    prometheus.NewDesc("keenetic_interface_rx_errors", "Receive errors", labels, nil),
		txErrorsDesc:    prometheus.NewDesc("keenetic_interface_tx_errors", "Transmit errors", labels, nil),
		rxDroppedDesc:   prometheus.NewDesc("keenetic_interface_rx_dropped", "Dropped received packets", labels, nil),
		txDroppedDesc:   prometheus.NewDesc("keenetic_interface_tx_dropped", "Dropped transmitted packets", labels, nil),
		rxBroadcastDesc: prometheus.NewDesc("keenetic_interface_rx_broadcast_packets", "Received broadcast packets", labels, nil),
		txBroadcastDesc: prometheus.NewDesc("keenetic_interface_tx_broadcast_packets", "Transmitted broadcast packets", labels, nil),
		rxMulticastDesc: prometheus.NewDesc("keenetic_interface_rx_multicast_packets", "Received multicast packets", labels, nil),
		txMulticastDesc: prometheus.NewDesc("keenetic_interface_tx_multicast_packets", "Transmitted multicast packets", labels, nil),
		rxSpeedBpsDesc:  prometheus.NewDesc("keenetic_interface_rx_speed_bps", "Receive speed in bits per second", labels, nil),
		txSpeedBpsDesc:  prometheus.NewDesc("keenetic_interface_tx_speed_bps", "Transmit speed in bits per second", labels, nil),
	}
}

func (c *InterfaceStatsCollector) Name() string {
	return "interface_stats"
}

func (c *InterfaceStatsCollector) Describe(ch chan<- *prometheus.Desc) {
	ch <- c.rxBytesDesc
	ch <- c.txBytesDesc
	ch <- c.rxPacketsDesc
	ch <- c.txPacketsDesc
	ch <- c.rxErrorsDesc
	ch <- c.txErrorsDesc
	ch <- c.rxDroppedDesc
	ch <- c.txDroppedDesc
	ch <- c.rxBroadcastDesc
	ch <- c.txBroadcastDesc
	ch <- c.rxMulticastDesc
	ch <- c.txMulticastDesc
	ch <- c.rxSpeedBpsDesc
	ch <- c.txSpeedBpsDesc
}

func (c *InterfaceStatsCollector) Collect(dev *device.Device, ch chan<- prometheus.Metric) error {
	var statsInfo any
	var ok bool

	hostname := dev.Name
	client := dev.Client

	dev.CacheMutex.RLock()
	statsInfo, ok = dev.Cache["interface_stats"]
	dev.CacheMutex.RUnlock()

	if !ok {
		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
		fresh, err := client.GetConnectedInterfaceStats(ctx)
		cancel()
		if err != nil {
			log.Printf("failed to get interface stats from %s: %v", hostname, err)
			return err
		}
		statsInfo = fresh
		dev.CacheMutex.Lock()
		dev.Cache["interface_stats"] = fresh
		dev.CacheMutex.Unlock()
	}

	stats, ok := statsInfo.(map[string]*keenetic.InterfaceStats)
	if !ok {
		log.Printf("invalid cache data type for interface stats on %s", hostname)
		return fmt.Errorf("invalid cache data type for interface stats")
	}

	for name, s := range stats {
		labels := []string{hostname, name}

		ch <- prometheus.MustNewConstMetric(c.rxBytesDesc, prometheus.CounterValue, s.RxBytes, labels...)
		ch <- prometheus.MustNewConstMetric(c.txBytesDesc, prometheus.CounterValue, s.TxBytes, labels...)
		ch <- prometheus.MustNewConstMetric(c.rxPacketsDesc, prometheus.CounterValue, s.RxPackets, labels...)
		ch <- prometheus.MustNewConstMetric(c.txPacketsDesc, prometheus.CounterValue, s.TxPackets, labels...)
		ch <- prometheus.MustNewConstMetric(c.rxErrorsDesc, prometheus.CounterValue, s.RxErrors, labels...)
		ch <- prometheus.MustNewConstMetric(c.txErrorsDesc, prometheus.CounterValue, s.TxErrors, labels...)
		ch <- prometheus.MustNewConstMetric(c.rxDroppedDesc, prometheus.CounterValue, s.RxDropped, labels...)
		ch <- prometheus.MustNewConstMetric(c.txDroppedDesc, prometheus.CounterValue, s.TxDropped, labels...)
		ch <- prometheus.MustNewConstMetric(c.rxBroadcastDesc, prometheus.CounterValue, s.RxBroadcastPackets, labels...)
		ch <- prometheus.MustNewConstMetric(c.txBroadcastDesc, prometheus.CounterValue, s.TxBroadcastPackets, labels...)
		ch <- prometheus.MustNewConstMetric(c.rxMulticastDesc, prometheus.CounterValue, s.RxMulticastPackets, labels...)
		ch <- prometheus.MustNewConstMetric(c.txMulticastDesc, prometheus.CounterValue, s.TxMulticastPackets, labels...)
		ch <- prometheus.MustNewConstMetric(c.rxSpeedBpsDesc, prometheus.GaugeValue, s.RxSpeed, labels...)
		ch <- prometheus.MustNewConstMetric(c.txSpeedBpsDesc, prometheus.GaugeValue, s.TxSpeed, labels...)
	}

	return nil
}