package main

import (
	"context"

	"go.opentelemetry.io/collector/component"
	"go.opentelemetry.io/collector/component/componenttest"
	"go.opentelemetry.io/collector/consumer/consumertest"
	"go.opentelemetry.io/collector/exporter"
)

const typeStr = "nop"

// NewNopCreateSettings returns a new nop settings for Create*Exporter functions.
func NewNopCreateSettings() exporter.CreateSettings {
	return exporter.CreateSettings{
		TelemetrySettings: componenttest.NewNopTelemetrySettings(),
		BuildInfo:         component.NewDefaultBuildInfo(),
	}
}

// NewNopFactory returns an exporter.Factory that constructs nop exporters.
func NewNopFactory() exporter.Factory {
	return exporter.NewFactory(
		"nop",
		func() component.Config { return &nopConfig{} },
		exporter.WithTraces(createTracesExporter, component.StabilityLevelStable),
		exporter.WithMetrics(createMetricsExporter, component.StabilityLevelStable),
		exporter.WithLogs(createLogsExporter, component.StabilityLevelStable),
	)
}

func createTracesExporter(context.Context, exporter.CreateSettings, component.Config) (exporter.Traces, error) {
	return nopInstance, nil
}

func createMetricsExporter(context.Context, exporter.CreateSettings, component.Config) (exporter.Metrics, error) {
	return nopInstance, nil
}

func createLogsExporter(context.Context, exporter.CreateSettings, component.Config) (exporter.Logs, error) {
	return nopInstance, nil
}

type nopConfig struct{}

var nopInstance = &nopExporter{
	Consumer: consumertest.NewNop(),
}

// nopExporter stores consumed traces and metrics for testing purposes.
type nopExporter struct {
	component.StartFunc
	component.ShutdownFunc
	consumertest.Consumer
}

// NewNopBuilder returns an exporter.Builder that constructs nop receivers.
func NewNopBuilder() *exporter.Builder {
	nopFactory := NewNopFactory()
	return exporter.NewBuilder(
		map[component.ID]component.Config{component.NewID(typeStr): nopFactory.CreateDefaultConfig()},
		map[component.Type]exporter.Factory{typeStr: nopFactory})
}