package dashboard

import (
	"dove/config"
	"fmt"
	"math"
	"math/rand"
	"strings"

	domainRepo "dove/repositories/domain"
	mailRepo "dove/repositories/mail"
	dnsSystem "dove/utils/dns"
)

type ServiceStatus struct {
	Name     string `json:"name"`
	Port     string `json:"port"`
	Protocol string `json:"protocol"`
	Active   bool   `json:"active"`
}

type SparklineData struct {
	LinePath string `json:"line_path"`
	FillPath string `json:"fill_path"`
}

type EmailCard struct {
	Sparkline24h   SparklineData `json:"sparkline_24h"`
	Sparkline7d    SparklineData `json:"sparkline_7d"`
	Sparkline30d   SparklineData `json:"sparkline_30d"`
	TotalMailboxes int64         `json:"total_mailboxes"`
	TotalDelivered int           `json:"total_delivered"`
	TotalBounced   int           `json:"total_bounced"`
	BounceRate     string        `json:"bounce_rate"`
	TotalMessages  int64         `json:"total_messages"`
}

type DomainStatusEntry struct {
	Name        string `json:"name"`
	StatusOk    int    `json:"status_ok"`
	StatusErr   int    `json:"status_err"`
	StatusWarn  int    `json:"status_warn"`
	Total       int    `json:"total"`
	PercentOk   string `json:"percent_ok"`
	PercentWarn string `json:"percent_warn"`
	PercentErr  string `json:"percent_err"`
}

type DomainsCard struct {
	Domains  []DomainStatusEntry `json:"domains"`
	Selected string              `json:"selected"`
}

type ProxyServiceEntry struct {
	Name   string `json:"name"`
	Target string `json:"target"`
	Up     bool   `json:"up"`
}

type ReverseProxyCard struct {
	Services []ProxyServiceEntry `json:"services"`
}

type StorageBucketEntry struct {
	Name       string  `json:"name"`
	UsageBytes int64   `json:"usage_bytes"`
	UsageLabel string  `json:"usage_label"`
	Percentage float64 `json:"percentage"`
}

type ObjectStorageCard struct {
	Buckets    []StorageBucketEntry `json:"buckets"`
	TotalUsage string               `json:"total_usage"`
}

type CronFailureEntry struct {
	JobName   string `json:"job_name"`
	Domain    string `json:"domain"`
	FailedAt  string `json:"failed_at"`
	ErrorText string `json:"error_text"`
}

type CronJobsCard struct {
	Failures  []CronFailureEntry `json:"failures"`
	TotalJobs int                `json:"total_jobs"`
	TotalRuns int                `json:"total_runs"`
	FailCount int                `json:"fail_count"`
}

type DoveStatusEntry struct {
	Route      string `json:"route"`
	Method     string `json:"method"`
	StatusCode int    `json:"status_code"`
	Count      int    `json:"count"`
}

type DoveCard struct {
	StatusGroups map[string]int    `json:"status_groups"`
	RecentRoutes []DoveStatusEntry `json:"recent_routes"`
	TotalRoutes  int               `json:"total_routes"`
}

type DnsCard struct {
	Configured bool   `json:"configured"`
	Address    string `json:"address"`
	Platform   string `json:"platform"`
}

type OverviewResponse struct {
	BindAddress  string            `json:"bind_address"`
	DnsAddress   string            `json:"dns_address"`
	Services     []ServiceStatus   `json:"services"`
	Email        EmailCard         `json:"email"`
	Domains      DomainsCard       `json:"domains"`
	ReverseProxy ReverseProxyCard  `json:"reverse_proxy"`
	Storage      ObjectStorageCard `json:"storage"`
	CronJobs     CronJobsCard      `json:"cron_jobs"`
	Dove         DoveCard          `json:"dove"`
	Dns          DnsCard           `json:"dns"`
}

func Overview() OverviewResponse {
	return OverviewResponse{
		BindAddress:  config.BindAddress,
		DnsAddress:   fmt.Sprintf("%s:%d", config.BindAddress, config.DnsPort),
		Services:     buildServiceStatuses(),
		Email:        buildEmailCard(),
		Domains:      buildDomainsCard(),
		ReverseProxy: buildReverseProxyCard(),
		Storage:      buildObjectStorageCard(),
		CronJobs:     buildCronJobsCard(),
		Dove:         buildDoveCard(),
		Dns:          buildDnsCard(),
	}
}

func buildServiceStatuses() []ServiceStatus {
	return []ServiceStatus{
		{Name: "HTTP", Port: fmt.Sprintf("%d", config.HttpPort), Protocol: "Plain", Active: true},
		{Name: "HTTPS", Port: "443", Protocol: "TLS", Active: false},
		{Name: "DNS", Port: fmt.Sprintf("%d", config.DnsPort), Protocol: "UDP/TCP", Active: true},
		{Name: "SMTP", Port: fmt.Sprintf("%d", config.SmtpPort), Protocol: "Plain/STARTTLS", Active: true},
		{Name: "SMTPS", Port: fmt.Sprintf("%d", config.SmtpsPort), Protocol: "TLS", Active: true},
		{Name: "SMTP (MSA)", Port: fmt.Sprintf("%d", config.SubmissionPort), Protocol: "Plain/STARTTLS", Active: true},
		{Name: "IMAP", Port: fmt.Sprintf("%d", config.ImapPort), Protocol: "Plain/STARTTLS", Active: false},
		{Name: "IMAPS", Port: fmt.Sprintf("%d", config.ImapsPort), Protocol: "TLS", Active: false},
		{Name: "POP3", Port: fmt.Sprintf("%d", config.Pop3Port), Protocol: "Plain/STARTTLS", Active: false},
		{Name: "POP3S", Port: fmt.Sprintf("%d", config.Pop3sPort), Protocol: "TLS", Active: false},
		{Name: "S3", Port: fmt.Sprintf("%d", config.S3Port), Protocol: "Plain", Active: false},
	}
}

const SparklineResolution = 100

func buildEmailCard() EmailCard {
	mailboxCount := mailRepo.CountMailboxes()
	emailCount := mailRepo.CountEmails()
	delivered := 150 + rand.Intn(500)
	bounced := rand.Intn(20)
	total := delivered + bounced
	bounceRate := 0.0
	if total > 0 {
		bounceRate = float64(bounced) / float64(total) * 100
	}

	return EmailCard{
		Sparkline24h:   generateSparkline(24, 3, 40),
		Sparkline7d:    generateSparkline(28, 10, 80),
		Sparkline30d:   generateSparkline(30, 30, 200),
		TotalMailboxes: mailboxCount,
		TotalDelivered: delivered,
		TotalBounced:   bounced,
		BounceRate:     fmt.Sprintf("%.1f", math.Round(bounceRate*10)/10),
		TotalMessages:  emailCount,
	}
}

func buildDomainsCard() DomainsCard {
	allDomains := domainRepo.AllDomains()
	entries := make([]DomainStatusEntry, 0, len(allDomains))

	for _, domain := range allDomains {
		tld := ""
		if domain.TLD.Name != "" {
			tld = "." + domain.TLD.Name
		}
		fullName := domain.Name + tld
		statusOk := 200 + rand.Intn(800)
		statusWarn := rand.Intn(50)
		statusErr := rand.Intn(30)
		total := statusOk + statusWarn + statusErr
		percentOk := 0.0
		percentWarn := 0.0
		percentErr := 0.0
		if total > 0 {
			percentOk = math.Round(float64(statusOk)/float64(total)*1000) / 10
			percentWarn = math.Round(float64(statusWarn)/float64(total)*1000) / 10
			percentErr = math.Round(float64(statusErr)/float64(total)*1000) / 10
		}
		entries = append(entries, DomainStatusEntry{
			Name:        fullName,
			StatusOk:    statusOk,
			StatusErr:   statusErr,
			StatusWarn:  statusWarn,
			Total:       total,
			PercentOk:   fmt.Sprintf("%.1f", percentOk),
			PercentWarn: fmt.Sprintf("%.1f", percentWarn),
			PercentErr:  fmt.Sprintf("%.1f", percentErr),
		})
	}

	selected := ""
	if len(entries) > 0 {
		selected = entries[0].Name
	}

	return DomainsCard{
		Domains:  entries,
		Selected: selected,
	}
}

func buildReverseProxyCard() ReverseProxyCard {
	return ReverseProxyCard{
		Services: []ProxyServiceEntry{
			{Name: "frontend", Target: "127.0.0.1:3001", Up: true},
			{Name: "api", Target: "127.0.0.1:8080", Up: true},
			{Name: "worker", Target: "127.0.0.1:9090", Up: false},
			{Name: "docs", Target: "127.0.0.1:4000", Up: true},
			{Name: "websocket", Target: "127.0.0.1:8443", Up: false},
		},
	}
}

func buildObjectStorageCard() ObjectStorageCard {
	buckets := []StorageBucketEntry{
		generateBucket("media-uploads", 1, 4),
		generateBucket("backups", 500, 2000),
		generateBucket("thumbnails", 50, 500),
		generateBucket("exports", 10, 200),
	}

	var totalBytes int64
	var maxBytes int64
	for _, bucket := range buckets {
		totalBytes += bucket.UsageBytes
		if bucket.UsageBytes > maxBytes {
			maxBytes = bucket.UsageBytes
		}
	}

	for index := range buckets {
		buckets[index].Percentage = float64(buckets[index].UsageBytes) / float64(maxBytes) * 100
	}

	return ObjectStorageCard{
		Buckets:    buckets,
		TotalUsage: formatBytes(totalBytes),
	}
}

func buildCronJobsCard() CronJobsCard {
	totalJobs := 5 + rand.Intn(8)
	totalRuns := 20 + rand.Intn(80)
	failures := []CronFailureEntry{
		{JobName: "cleanup-temp", Domain: "api.dove", FailedAt: "2m ago", ErrorText: "Connection refused on :8080"},
		{JobName: "sync-storage", Domain: "cdn.dove", FailedAt: "18m ago", ErrorText: "Bucket not found: staging"},
		{JobName: "health-ping", Domain: "monitor.dove", FailedAt: "1h ago", ErrorText: "Timeout after 30s"},
	}

	return CronJobsCard{
		Failures:  failures,
		TotalJobs: totalJobs,
		TotalRuns: totalRuns,
		FailCount: len(failures),
	}
}

func buildDoveCard() DoveCard {
	statusGroups := map[string]int{
		"2xx": 800 + rand.Intn(2000),
		"3xx": 50 + rand.Intn(200),
		"4xx": 10 + rand.Intn(50),
		"5xx": rand.Intn(10),
	}

	recentRoutes := []DoveStatusEntry{
		{Route: "/dashboard", Method: "GET", StatusCode: 200, Count: 120 + rand.Intn(200)},
		{Route: "/domains", Method: "GET", StatusCode: 200, Count: 80 + rand.Intn(150)},
		{Route: "/mail/webmail", Method: "GET", StatusCode: 200, Count: 60 + rand.Intn(100)},
		{Route: "/domains/records", Method: "POST", StatusCode: 201, Count: 15 + rand.Intn(30)},
		{Route: "/auth/login", Method: "POST", StatusCode: 302, Count: 10 + rand.Intn(20)},
		{Route: "/mail/compose", Method: "POST", StatusCode: 500, Count: rand.Intn(5)},
		{Route: "/domains/manage", Method: "DELETE", StatusCode: 404, Count: rand.Intn(8)},
	}

	return DoveCard{
		StatusGroups: statusGroups,
		RecentRoutes: recentRoutes,
		TotalRoutes:  len(recentRoutes),
	}
}

func generateBucket(name string, minMegabytes int, maxMegabytes int) StorageBucketEntry {
	megabytes := int64(minMegabytes) + int64(rand.Intn(maxMegabytes-minMegabytes))
	bytes := megabytes * 1024 * 1024
	return StorageBucketEntry{
		Name:       name,
		UsageBytes: bytes,
		UsageLabel: formatBytes(bytes),
	}
}

func generateSparkline(anchorCount int, minValue float64, maxValue float64) SparklineData {
	viewboxWidth := 200.0
	viewboxHeight := 40.0
	padding := 2.0

	anchorValues := make([]float64, anchorCount)
	currentValue := minValue + (maxValue-minValue)*0.3 + rand.Float64()*(maxValue-minValue)*0.4

	for index := range anchorValues {
		delta := (rand.Float64() - 0.45) * (maxValue - minValue) * 0.25
		currentValue += delta
		currentValue = math.Max(minValue, math.Min(maxValue, currentValue))
		anchorValues[index] = currentValue
	}

	smoothValues := catmullRomResample(anchorValues, SparklineResolution)

	minPoint := smoothValues[0]
	maxPoint := smoothValues[0]
	for _, point := range smoothValues {
		if point < minPoint {
			minPoint = point
		}
		if point > maxPoint {
			maxPoint = point
		}
	}

	pointRange := maxPoint - minPoint
	if pointRange == 0 {
		pointRange = 1
	}

	lineCoordinates := make([]string, SparklineResolution)
	for index, point := range smoothValues {
		horizontalPosition := padding + (float64(index)/float64(SparklineResolution-1))*(viewboxWidth-2*padding)
		verticalPosition := padding + (1-(point-minPoint)/pointRange)*(viewboxHeight-2*padding)
		lineCoordinates[index] = fmt.Sprintf("%.1f,%.1f", horizontalPosition, verticalPosition)
	}

	linePath := strings.Join(lineCoordinates, " ")

	fillPath := fmt.Sprintf("M%.1f,%.1f L%s L%.1f,%.1f Z",
		padding, viewboxHeight,
		linePath,
		viewboxWidth-padding, viewboxHeight,
	)

	return SparklineData{
		LinePath: linePath,
		FillPath: fillPath,
	}
}

func catmullRomResample(inputValues []float64, outputCount int) []float64 {
	inputCount := len(inputValues)
	if inputCount < 2 {
		return inputValues
	}

	resampledValues := make([]float64, outputCount)
	for outputIndex := 0; outputIndex < outputCount; outputIndex++ {
		normalizedPosition := float64(outputIndex) / float64(outputCount-1) * float64(inputCount-1)
		segmentIndex := int(normalizedPosition)
		segmentFraction := normalizedPosition - float64(segmentIndex)

		point0 := inputValues[max(0, segmentIndex-1)]
		point1 := inputValues[min(inputCount-1, segmentIndex)]
		point2 := inputValues[min(inputCount-1, segmentIndex+1)]
		point3 := inputValues[min(inputCount-1, segmentIndex+2)]

		fractionSquared := segmentFraction * segmentFraction
		fractionCubed := fractionSquared * segmentFraction

		resampledValues[outputIndex] = 0.5 * ((2 * point1) +
			(-point0+point2)*segmentFraction +
			(2*point0-5*point1+4*point2-point3)*fractionSquared +
			(-point0+3*point1-3*point2+point3)*fractionCubed)
	}

	return resampledValues
}

func buildDnsCard() DnsCard {
	systemDnsStatus := dnsSystem.CheckSystemDns()
	return DnsCard{
		Configured: systemDnsStatus.Configured,
		Address:    systemDnsStatus.Address,
		Platform:   systemDnsStatus.Platform,
	}
}

func formatBytes(bytes int64) string {
	if bytes < 1024 {
		return fmt.Sprintf("%d B", bytes)
	}
	if bytes < 1024*1024 {
		return fmt.Sprintf("%.1f KB", float64(bytes)/1024)
	}
	if bytes < 1024*1024*1024 {
		return fmt.Sprintf("%.1f MB", float64(bytes)/(1024*1024))
	}
	return fmt.Sprintf("%.1f GB", float64(bytes)/(1024*1024*1024))
}