// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package metric

import "go.opentelemetry.io/otel/sdk/resource"

// Config contains configuration for an SDK.
type Config struct {
	// ErrorHandler is the function called when the SDK encounters an error.
	//
	// This option can be overridden after instantiation of the SDK
	// with the `SetErrorHandler` method.
	ErrorHandler ErrorHandler

	// Resource is the OpenTelemetry resource associated with all Meters
	// created by the SDK.
	Resource resource.Resource
}

// Option is the interface that applies the value to a configuration option.
type Option interface {
	// Apply sets the Option value of a Config.
	Apply(*Config)
}

// WithErrorHandler sets the ErrorHandler configuration option of a Config.
func WithErrorHandler(fn ErrorHandler) Option {
	return errorHandlerOption(fn)
}

type errorHandlerOption ErrorHandler

func (o errorHandlerOption) Apply(config *Config) {
	config.ErrorHandler = ErrorHandler(o)
}

// WithResource sets the Resource configuration option of a Config.
func WithResource(r resource.Resource) Option {
	return resourceOption(r)
}

type resourceOption resource.Resource

func (o resourceOption) Apply(config *Config) {
	config.Resource = resource.Resource(o)
}