// Copyright 2018 Google LLC All Rights Reserved.
//
// 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 name

const (
	// DefaultRegistry is the registry name that will be used if no registry
	// provided and the default is not overridden.
	DefaultRegistry      = "index.docker.io"
	defaultRegistryAlias = "docker.io"

	// DefaultTag is the tag name that will be used if no tag provided and the
	// default is not overridden.
	DefaultTag = "latest"
)

type options struct {
	strict          bool // weak by default
	insecure        bool // secure by default
	defaultRegistry string
	defaultTag      string
}

func makeOptions(opts ...Option) options {
	opt := options{
		defaultRegistry: DefaultRegistry,
		defaultTag:      DefaultTag,
	}
	for _, o := range opts {
		o(&opt)
	}
	return opt
}

// Option is a functional option for name parsing.
type Option func(*options)

// StrictValidation is an Option that requires image references to be fully
// specified; i.e. no defaulting for registry (dockerhub), repo (library),
// or tag (latest).
func StrictValidation(opts *options) {
	opts.strict = true
}

// WeakValidation is an Option that sets defaults when parsing names, see
// StrictValidation.
func WeakValidation(opts *options) {
	opts.strict = false
}

// Insecure is an Option that allows image references to be fetched without TLS.
func Insecure(opts *options) {
	opts.insecure = true
}

// OptionFn is a function that returns an option.
type OptionFn func() Option

// WithDefaultRegistry sets the default registry that will be used if one is not
// provided.
func WithDefaultRegistry(r string) Option {
	return func(opts *options) {
		opts.defaultRegistry = r
	}
}

// WithDefaultTag sets the default tag that will be used if one is not provided.
func WithDefaultTag(t string) Option {
	return func(opts *options) {
		opts.defaultTag = t
	}
}