package report

import (
	"strconv"
	"strings"
	"time"

	"gitea.dooplex.hu/admin/felhom-controller/internal/backup"
	"gitea.dooplex.hu/admin/felhom-controller/internal/config"
	"gitea.dooplex.hu/admin/felhom-controller/internal/metrics"
	"gitea.dooplex.hu/admin/felhom-controller/internal/monitor"
	"gitea.dooplex.hu/admin/felhom-controller/internal/scheduler"
	"gitea.dooplex.hu/admin/felhom-controller/internal/stacks"
	"gitea.dooplex.hu/admin/felhom-controller/internal/system"
)

// BuildReport collects current state from all subsystems and returns a Report.
func BuildReport(
	cfg *config.Config,
	stackMgr *stacks.Manager,
	backupMgr *backup.Manager,
	cpuCollector *system.CPUCollector,
	metricsStore *metrics.MetricsStore,
	version string,
) *Report {
	r := &Report{
		Version:           1,
		CustomerID:        cfg.Customer.ID,
		CustomerName:      cfg.Customer.Name,
		ControllerVersion: version,
		Timestamp:         time.Now().UTC(),
	}

	// System info
	staticInfo := metrics.GetStaticInfo()
	sysInfo := system.GetInfo(cfg.Paths.HDDPath, cpuCollector)

	r.System = SystemReport{
		Hostname:           staticInfo.Hostname,
		OS:                 staticInfo.OS,
		Kernel:             staticInfo.Kernel,
		CPUModel:           staticInfo.CPUModel,
		CPUCores:           staticInfo.CPUCores,
		UptimeSeconds:      staticInfo.UptimeSeconds,
		CPUPercent:         sysInfo.CPUPercent,
		MemoryTotalMB:      sysInfo.TotalMemMB,
		MemoryUsedMB:       sysInfo.UsedMemMB,
		MemoryPercent:      sysInfo.MemPercent,
		TemperatureCelsius: sysInfo.TemperatureCelsius,
		LoadAvg1:           sysInfo.LoadAvg1,
		LoadAvg5:           sysInfo.LoadAvg5,
		LoadAvg15:          sysInfo.LoadAvg15,
	}

	// Storage
	r.Storage = []StorageReport{
		{Mount: "/", TotalGB: sysInfo.DiskTotalGB, UsedGB: sysInfo.DiskUsedGB, Percent: sysInfo.DiskPercent},
	}
	if sysInfo.HDDConfigured {
		r.Storage = append(r.Storage, StorageReport{
			Mount:   cfg.Paths.HDDPath,
			TotalGB: sysInfo.HDDTotalGB,
			UsedGB:  sysInfo.HDDUsedGB,
			Percent: sysInfo.HDDPercent,
		})
	}

	// Containers
	r.Containers = buildContainerReport(stackMgr, metricsStore)

	// Backup
	r.Backup = buildBackupReport(cfg, backupMgr)

	// Health
	healthReport := monitor.RunHealthCheck(cfg, cpuCollector)
	r.Health = HealthReport{
		Status:   healthReport.Status,
		Issues:   healthReport.Issues,
		Warnings: healthReport.Warnings,
	}
	if r.Health.Issues == nil {
		r.Health.Issues = []string{}
	}
	if r.Health.Warnings == nil {
		r.Health.Warnings = []string{}
	}

	// Stacks
	r.Stacks = buildStacksReport(stackMgr)

	return r
}

func buildContainerReport(stackMgr *stacks.Manager, metricsStore *metrics.MetricsStore) ContainerReport {
	cr := ContainerReport{}

	allStacks := stackMgr.GetStacks()

	// Build a map of container stats from metrics store
	statsMap := make(map[string]metrics.ContainerCurrentStats)
	if metricsStore != nil {
		if stats, err := metricsStore.QueryContainerSummary(); err == nil {
			for _, s := range stats {
				statsMap[s.ContainerName] = s
			}
		}
	}

	for _, s := range allStacks {
		if !s.Deployed {
			continue
		}
		for _, c := range s.Containers {
			cr.Total++
			switch c.State {
			case stacks.StateRunning, stacks.StateStarting:
				cr.Running++
			case stacks.StateUnhealthy:
				cr.Unhealthy++
				cr.Running++ // unhealthy containers are still running
			default:
				cr.Stopped++
			}

			detail := ContainerDetailReport{
				Name:  c.Name,
				State: string(c.State),
			}
			if cs, ok := statsMap[c.Name]; ok {
				detail.CPUPercent = cs.CPUPercent
				detail.MemoryMB = cs.MemUsageMB
			}
			cr.List = append(cr.List, detail)
		}
	}

	if cr.List == nil {
		cr.List = []ContainerDetailReport{}
	}

	return cr
}

func buildBackupReport(cfg *config.Config, backupMgr *backup.Manager) BackupReport {
	br := BackupReport{
		Enabled: cfg.Backup.Enabled,
	}

	if backupMgr == nil {
		return br
	}

	nextDBDump := scheduler.NextDailyRun(cfg.Backup.DBDumpSchedule)
	nextBackup := scheduler.NextDailyRun(cfg.Backup.ResticSchedule)
	status := backupMgr.GetFullStatus(nextDBDump, nextBackup)

	if status.LastDBDump != nil {
		t := status.LastDBDump.LastRun
		br.LastDBDump = &t
	}
	if status.LastBackup != nil {
		t := status.LastBackup.LastRun
		br.LastSnapshot = &t
	}
	if status.RepoStats != nil {
		br.SnapshotCount = status.RepoStats.SnapshotCount
		br.RepoSizeMB = parseSizeToMB(status.RepoStats.TotalSize)
	}
	if !status.LastCheckTime.IsZero() {
		t := status.LastCheckTime
		br.LastIntegrityCheck = &t
	}
	br.IntegrityOK = status.LastCheckOK

	return br
}

func buildStacksReport(stackMgr *stacks.Manager) StacksReport {
	sr := StacksReport{}
	allStacks := stackMgr.GetStacks()

	for _, s := range allStacks {
		if s.Protected {
			continue
		}
		if s.Deployed {
			sr.Deployed = append(sr.Deployed, s.Name)
		} else {
			sr.Available = append(sr.Available, s.Name)
		}
	}

	if sr.Deployed == nil {
		sr.Deployed = []string{}
	}
	if sr.Available == nil {
		sr.Available = []string{}
	}

	return sr
}

// parseSizeToMB parses a formatted size string like "1.5 GB", "512.0 MB" into MB.
func parseSizeToMB(s string) int64 {
	s = strings.TrimSpace(s)
	if s == "" {
		return 0
	}

	parts := strings.Fields(s)
	if len(parts) != 2 {
		return 0
	}

	val, err := strconv.ParseFloat(parts[0], 64)
	if err != nil {
		return 0
	}

	switch strings.ToUpper(parts[1]) {
	case "GB":
		return int64(val * 1024)
	case "MB":
		return int64(val)
	case "KB":
		return int64(val / 1024)
	default:
		return int64(val)
	}
}