package metrics

import "context"

// NopMeterProvider is a no-op metrics implementation.
type NopMeterProvider struct{}

var _ MeterProvider = (*NopMeterProvider)(nil)

// Meter returns a meter which creates no-op instruments.
func (NopMeterProvider) Meter(string, ...MeterOption) Meter {
	return nopMeter{}
}

type nopMeter struct{}

var _ Meter = (*nopMeter)(nil)

func (nopMeter) Int64Counter(string, ...InstrumentOption) (Int64Counter, error) {
	return nopInstrument[int64]{}, nil
}
func (nopMeter) Int64UpDownCounter(string, ...InstrumentOption) (Int64UpDownCounter, error) {
	return nopInstrument[int64]{}, nil
}
func (nopMeter) Int64Gauge(string, ...InstrumentOption) (Int64Gauge, error) {
	return nopInstrument[int64]{}, nil
}
func (nopMeter) Int64Histogram(string, ...InstrumentOption) (Int64Histogram, error) {
	return nopInstrument[int64]{}, nil
}
func (nopMeter) Int64AsyncCounter(string, Int64Callback, ...InstrumentOption) (AsyncInstrument, error) {
	return nopInstrument[int64]{}, nil
}
func (nopMeter) Int64AsyncUpDownCounter(string, Int64Callback, ...InstrumentOption) (AsyncInstrument, error) {
	return nopInstrument[int64]{}, nil
}
func (nopMeter) Int64AsyncGauge(string, Int64Callback, ...InstrumentOption) (AsyncInstrument, error) {
	return nopInstrument[int64]{}, nil
}
func (nopMeter) Float64Counter(string, ...InstrumentOption) (Float64Counter, error) {
	return nopInstrument[float64]{}, nil
}
func (nopMeter) Float64UpDownCounter(string, ...InstrumentOption) (Float64UpDownCounter, error) {
	return nopInstrument[float64]{}, nil
}
func (nopMeter) Float64Gauge(string, ...InstrumentOption) (Float64Gauge, error) {
	return nopInstrument[float64]{}, nil
}
func (nopMeter) Float64Histogram(string, ...InstrumentOption) (Float64Histogram, error) {
	return nopInstrument[float64]{}, nil
}
func (nopMeter) Float64AsyncCounter(string, Float64Callback, ...InstrumentOption) (AsyncInstrument, error) {
	return nopInstrument[float64]{}, nil
}
func (nopMeter) Float64AsyncUpDownCounter(string, Float64Callback, ...InstrumentOption) (AsyncInstrument, error) {
	return nopInstrument[float64]{}, nil
}
func (nopMeter) Float64AsyncGauge(string, Float64Callback, ...InstrumentOption) (AsyncInstrument, error) {
	return nopInstrument[float64]{}, nil
}

type nopInstrument[N any] struct{}

func (nopInstrument[N]) Add(context.Context, N, ...RecordMetricOption)    {}
func (nopInstrument[N]) Sample(context.Context, N, ...RecordMetricOption) {}
func (nopInstrument[N]) Record(context.Context, N, ...RecordMetricOption) {}
func (nopInstrument[_]) Stop()                                            {}