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

type InternetCollector struct {
	enabledDesc           *prometheus.Desc
	reliableDesc          *prometheus.Desc
	gatewayAccessibleDesc *prometheus.Desc
	dnsAccessibleDesc     *prometheus.Desc
	captiveAccessibleDesc *prometheus.Desc
	internetDesc          *prometheus.Desc
	gatewayFailuresDesc   *prometheus.Desc
	captiveFailuresDesc   *prometheus.Desc
}

func NewInternetCollector() *InternetCollector {
	labels := []string{"device", "interface"}
	return &InternetCollector{
		enabledDesc:           prometheus.NewDesc("keenetic_internet_enabled", "Internet enabled", labels, nil),
		reliableDesc:          prometheus.NewDesc("keenetic_internet_reliable", "Internet reliable", labels, nil),
		gatewayAccessibleDesc: prometheus.NewDesc("keenetic_gateway_accessible", "Gateway accessible", labels, nil),
		dnsAccessibleDesc:     prometheus.NewDesc("keenetic_dns_accessible", "DNS accessible", labels, nil),
		captiveAccessibleDesc: prometheus.NewDesc("keenetic_captive_accessible", "Captive portal accessible", labels, nil),
		internetDesc:          prometheus.NewDesc("keenetic_internet_available", "Internet available", labels, nil),
		gatewayFailuresDesc:   prometheus.NewDesc("keenetic_gateway_failures", "Gateway access failure count", labels, nil),
		captiveFailuresDesc:   prometheus.NewDesc("keenetic_captive_failures", "Captive portal failure count", labels, nil),
	}
}

func (c *InternetCollector) Name() string {
	return "internet"
}

func (c *InternetCollector) Describe(ch chan<- *prometheus.Desc) {
	ch <- c.enabledDesc
	ch <- c.reliableDesc
	ch <- c.gatewayAccessibleDesc
	ch <- c.dnsAccessibleDesc
	ch <- c.captiveAccessibleDesc
	ch <- c.internetDesc
	ch <- c.gatewayFailuresDesc
	ch <- c.captiveFailuresDesc
}

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

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

	dev.CacheMutex.RLock()
	internetInfo, ok = dev.Cache["internet"]
	valid := time.Since(dev.LastUpdate) < dev.CacheTTL
	dev.CacheMutex.RUnlock()

	if !ok || !valid {
		ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
		fresh, err := client.GetInternetStatus(ctx)
		cancel()
		if err != nil {
			log.Printf("failed to get internet status from %s: %v", hostname, err)
			return err
		}
		internetInfo = fresh
		dev.CacheMutex.Lock()
		dev.Cache["internet"] = fresh
		dev.LastUpdate = time.Now()
		dev.CacheMutex.Unlock()
	}

	status, ok := internetInfo.(*keenetic.InternetStatus)
	if !ok || status == nil {
		log.Printf("invalid cache data type for internet status on %s", hostname)
		return fmt.Errorf("invalid cache data type for internet status")
	}

	iface := status.Gateway.Interface
	labels := []string{hostname, iface}

	ch <- prometheus.MustNewConstMetric(c.enabledDesc, prometheus.GaugeValue, utils.BoolToFloat(status.Enabled), labels...)
	ch <- prometheus.MustNewConstMetric(c.reliableDesc, prometheus.GaugeValue, utils.BoolToFloat(status.Reliable), labels...)
	ch <- prometheus.MustNewConstMetric(c.gatewayAccessibleDesc, prometheus.GaugeValue, utils.BoolToFloat(status.GatewayAccessible), labels...)
	ch <- prometheus.MustNewConstMetric(c.dnsAccessibleDesc, prometheus.GaugeValue, utils.BoolToFloat(status.DNSAccessible), labels...)
	ch <- prometheus.MustNewConstMetric(c.captiveAccessibleDesc, prometheus.GaugeValue, utils.BoolToFloat(status.CaptiveAccessible), labels...)
	ch <- prometheus.MustNewConstMetric(c.internetDesc, prometheus.GaugeValue, utils.BoolToFloat(status.Internet), labels...)
	ch <- prometheus.MustNewConstMetric(c.gatewayFailuresDesc, prometheus.GaugeValue, status.Gateway.Failures, labels...)
	ch <- prometheus.MustNewConstMetric(c.captiveFailuresDesc, prometheus.GaugeValue, status.Captive.Failures, labels...)

	return nil
}