package notify

import "time"

type snapshotBindingDiagnostics struct {
	BindingOwner              string
	BindingAlive              bool
	BindingCurrent            bool
	BindingReason             string
	BindingError              string
	TransportAttached         bool
	TransportHasRuntimeConn   bool
	TransportCurrent          bool
	TransportDetachReason     string
	TransportDetachKind       string
	TransportDetachError      string
	TransportDetachGeneration uint64
	TransportDetachedAt       time.Time
	ReattachEligible          bool
}

func snapshotBindingDiagnosticsFromClient(c *ClientCommon, sessionEpoch uint64) snapshotBindingDiagnostics {
	diag := snapshotBindingDiagnostics{
		BindingOwner: "client-session",
	}
	if c == nil {
		return diag
	}
	status := c.Status()
	diag.BindingAlive = status.Alive
	diag.BindingCurrent = sessionEpoch == 0 || c.isClientSessionEpochCurrent(sessionEpoch)
	diag.BindingReason = status.Reason
	if status.Err != nil {
		diag.BindingError = status.Err.Error()
	}
	diag.TransportAttached = c.clientTransportAttachedSnapshot()
	diag.TransportHasRuntimeConn = c.clientTransportConnSnapshot() != nil
	diag.TransportCurrent = diag.BindingCurrent && diag.TransportAttached
	return diag
}

func snapshotBindingDiagnosticsFromLogical(logical *LogicalConn, transport *TransportConn, transportGeneration uint64) snapshotBindingDiagnostics {
	if logical == nil && transport != nil {
		logical = transport.LogicalConn()
	}
	diag := snapshotBindingDiagnostics{}
	if logical == nil {
		return diag
	}
	runtime := logical.runtimeSnapshot()
	diag.BindingOwner = "server-logical"
	if transport != nil {
		diag.BindingOwner = "server-transport"
	}
	diag.BindingAlive = runtime.Alive
	diag.BindingReason = runtime.Reason
	diag.BindingError = runtime.Error
	diag.TransportAttached = runtime.TransportAttached
	diag.TransportHasRuntimeConn = runtime.HasRuntimeConn
	diag.TransportDetachReason = runtime.TransportDetachReason
	diag.TransportDetachKind = runtime.TransportDetachKind
	diag.TransportDetachError = runtime.TransportDetachError
	diag.TransportDetachGeneration = runtime.TransportDetachGeneration
	diag.TransportDetachedAt = runtime.TransportDetachedAt
	diag.ReattachEligible = runtime.ReattachEligible
	switch {
	case transport != nil:
		diag.TransportCurrent = transport.IsCurrent()
	case transportGeneration != 0:
		diag.TransportCurrent = runtime.TransportAttached && runtime.TransportGeneration == transportGeneration
	default:
		diag.TransportCurrent = runtime.TransportAttached
	}
	diag.BindingCurrent = diag.BindingAlive && diag.TransportCurrent
	return diag
}