/*
Copyright 2015 The Kubernetes Authors 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 registry

import (
	"fmt"
	"io/ioutil"
	"log"

	"github.com/ghodss/yaml"
	"github.com/kubernetes/deployment-manager/common"

	/*
		"net/url"
		"regexp"
		"strings"
		"sync"
	*/)

// CredentialProvider provides credentials for registries.
type FilebasedCredentialProvider struct {
	// Actual backing store
	backingCredentialProvider common.CredentialProvider
}

type NamedRegistryCredential struct {
	Name string `json:"name,omitempty"`
	common.RegistryCredential
}

func NewFilebasedCredentialProvider(filename string) (common.CredentialProvider, error) {
	icp := NewInmemCredentialProvider()
	c, err := readCredentialsFile(filename)
	if err != nil {
		return &FilebasedCredentialProvider{}, err
	}
	for _, nc := range c {
		log.Printf("Adding credential %s", nc.Name)
		icp.SetCredential(nc.Name, &nc.RegistryCredential)
	}

	return &FilebasedCredentialProvider{icp}, nil
}

func readCredentialsFile(filename string) ([]NamedRegistryCredential, error) {
	bytes, err := ioutil.ReadFile(filename)
	if err != nil {
		return []NamedRegistryCredential{}, err
	}
	return parseCredentials(bytes)
}

func parseCredentials(bytes []byte) ([]NamedRegistryCredential, error) {
	r := []NamedRegistryCredential{}
	if err := yaml.Unmarshal(bytes, &r); err != nil {
		return []NamedRegistryCredential{}, fmt.Errorf("cannot unmarshal credentials file (%#v)", err)
	}
	return r, nil
}

func (fcp *FilebasedCredentialProvider) GetCredential(name string) (*common.RegistryCredential, error) {
	return fcp.backingCredentialProvider.GetCredential(name)
}

func (fcp *FilebasedCredentialProvider) SetCredential(name string, credential *common.RegistryCredential) error {
	return fmt.Errorf("SetCredential operation not supported with FilebasedCredentialProvider")
}