package observability

import (
	"context"
	"fmt"
)

// Tracer provides distributed tracing
type Tracer interface {
	StartSpan(ctx context.Context, name string) (context.Context, Span)
}

// Span represents a tracing span
type Span interface {
	End()
	SetAttribute(key string, value interface{})
	SetError(err error)
}

// MockTracer is a mock tracer for development
type MockTracer struct{}

// StartSpan starts a new span
func (t *MockTracer) StartSpan(ctx context.Context, name string) (context.Context, Span) {
	return ctx, &MockSpan{}
}

// MockSpan is a mock span
type MockSpan struct{}

// End ends the span
func (m *MockSpan) End() {}

// SetAttribute sets an attribute
func (m *MockSpan) SetAttribute(key string, value interface{}) {}

// SetError sets an error
func (m *MockSpan) SetError(err error) {}

// TraceConversation traces a conversation turn
func TraceConversation(ctx context.Context, tracer Tracer, sessionID, userID string, input string) (context.Context, Span) {
	ctx, span := tracer.StartSpan(ctx, "conversation.turn")
	span.SetAttribute("session_id", sessionID)
	span.SetAttribute("user_id", userID)
	span.SetAttribute("input_length", len(input))
	return ctx, span
}