package layer_attr

import (
	"git.ma-al.com/maal-libraries/observer/pkg/attr"
	"git.ma-al.com/maal-libraries/observer/pkg/level"
	"go.opentelemetry.io/otel/attribute"
	"go.opentelemetry.io/otel/trace"
)

type Handler struct {
	// Extra attributes to be attached. Can be also added with [Handler.CustomAttrs] method.
	Attributes       []attribute.KeyValue
	Level            level.SeverityLevel
	Name             string
	extraSkipInStack int
}

func (h Handler) IntoTraceAttributes() []attribute.KeyValue {
	attrs := make([]attribute.KeyValue, 5+len(h.Attributes))
	attrs = append(attrs, attr.SourceCodeLocation(1+h.extraSkipInStack)...) // 3 attrs added here
	attrs = append(attrs, attr.ServiceLayer(attr.LayerHandler), attr.SeverityLevel(h.Level))
	if len(h.Name) > 0 {
		attrs = append(attrs, attr.ServiceLayerName(h.Name))
	}
	attrs = append(attrs, h.Attributes...)
	return attrs
}

func (h Handler) CustomAttrs(attrs ...interface{}) Handler {
	h.Attributes = append(h.Attributes, attr.CollectAttributes(attrs...)...)
	return h
}

func (h *Handler) SkipMoreInCallStack(skip int) {
	h.extraSkipInStack += skip
}

// Works the same as [Handler.IntoTraceAttributes]
func (h Handler) AsAttrs() []attribute.KeyValue {
	h.extraSkipInStack += 1
	return h.IntoTraceAttributes()
}

func (h Handler) AsOpts() trace.SpanStartEventOption {
	h.extraSkipInStack += 1
	return trace.WithAttributes(h.IntoTraceAttributes()...)
}

type Service struct {
	// Extra attributes to be attached. Can be also added with [Service.CustomAttrs] method.
	Attributes       []attribute.KeyValue
	Level            level.SeverityLevel
	Name             string
	extraSkipInStack int
}

func (s Service) IntoTraceAttributes() []attribute.KeyValue {
	attrs := make([]attribute.KeyValue, 6+len(s.Attributes))
	attrs = append(attrs, attr.SourceCodeLocation(1+s.extraSkipInStack)...)
	attrs = append(attrs, attr.ServiceLayer(attr.LayerService), attr.SeverityLevel(s.Level))
	if len(s.Name) > 0 {
		attrs = append(attrs, attr.ServiceLayerName(s.Name))
	}
	attrs = append(attrs, s.Attributes...)
	return attrs
}

// Works the same as [Service.IntoTraceAttributes]
func (s Service) AsAttrs() []attribute.KeyValue {
	s.extraSkipInStack += 1
	return s.IntoTraceAttributes()
}

func (s Service) CustomAttrs(attrs ...interface{}) Service {
	s.Attributes = append(s.Attributes, attr.CollectAttributes(attrs...)...)
	return s
}

func (s *Service) SkipMoreInCallStack(skip int) {
	s.extraSkipInStack += skip
}

func (s Service) AsOpts() trace.SpanStartEventOption {
	s.extraSkipInStack += 1
	return trace.WithAttributes(s.IntoTraceAttributes()...)
}

type Repo struct {
	// Extra attributes to be attached. Can be also added with [Repo.CustomAttrs] method
	Attributes       []attribute.KeyValue
	Level            level.SeverityLevel
	Name             string
	extraSkipInStack int
}

func (r Repo) IntoTraceAttributes() []attribute.KeyValue {
	attrs := make([]attribute.KeyValue, 6+len(r.Attributes))
	attrs = append(attrs, attr.SourceCodeLocation(1+r.extraSkipInStack)...)
	attrs = append(attrs, attr.ServiceLayer(attr.LayerRepository), attr.SeverityLevel(r.Level))
	if len(r.Name) > 0 {
		attrs = append(attrs, attr.ServiceLayerName(r.Name))
	}
	attrs = append(attrs, r.Attributes...)
	return attrs
}

// Works the same as [Repo.IntoTraceAttributes]
func (r Repo) AsAttrs() []attribute.KeyValue {
	r.extraSkipInStack += 1
	return r.IntoTraceAttributes()
}

func (r Repo) CustomAttrs(attrs ...interface{}) Repo {
	r.Attributes = append(r.Attributes, attr.CollectAttributes(attrs...)...)
	return r
}
func (r *Repo) SkipMoreInCallStack(skip int) {
	r.extraSkipInStack += skip
}

func (r Repo) AsOpts() trace.SpanStartEventOption {
	r.extraSkipInStack += 1
	return trace.WithAttributes(r.IntoTraceAttributes()...)
}