/*
 * Copyright 2020 Intel Corporation, Inc
 *
 * 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 module

import (
	"encoding/json"

	"github.com/onap/multicloud-k8s/src/orchestrator/pkg/infra/db"

	pkgerrors "github.com/pkg/errors"
)

// Project contains the metaData for Projects
type Project struct {
	MetaData ProjectMetaData `json:"metadata"`
}

// ProjectMetaData contains the parameters for creating a project
type ProjectMetaData struct {
	Name        string `json:"name"`
	Description string `json:"description"`
	UserData1   string `userData1:"userData1"`
	UserData2   string `userData2:"userData2"`
}

// ProjectKey is the key structure that is used in the database
type ProjectKey struct {
	ProjectName string `json:"project"`
}

// We will use json marshalling to convert to string to
// preserve the underlying structure.
func (pk ProjectKey) String() string {
	out, err := json.Marshal(pk)
	if err != nil {
		return ""
	}

	return string(out)
}

// ProjectManager is an interface exposes the Project functionality
type ProjectManager interface {
	CreateProject(pr Project) (Project, error)
	GetProject(name string) (Project, error)
	DeleteProject(name string) error
}

// ProjectClient implements the ProjectManager
// It will also be used to maintain some localized state
type ProjectClient struct {
	storeName           string
	tagMeta, tagContent string
}

// NewProjectClient returns an instance of the ProjectClient
// which implements the ProjectManager
func NewProjectClient() *ProjectClient {
	return &ProjectClient{
		storeName: "orchestrator",
		tagMeta:   "projectmetadata",
	}
}

// CreateProject a new collection based on the project
func (v *ProjectClient) CreateProject(p Project) (Project, error) {

	//Construct the composite key to select the entry
	key := ProjectKey{
		ProjectName: p.MetaData.Name,
	}

	//Check if this Project already exists
	_, err := v.GetProject(p.MetaData.Name)
	if err == nil {
		return Project{}, pkgerrors.New("Project already exists")
	}

	err = db.DBconn.Create(v.storeName, key, v.tagMeta, p)
	if err != nil {
		return Project{}, pkgerrors.Wrap(err, "Creating DB Entry")
	}

	return p, nil
}

// GetProject returns the Project for corresponding name
func (v *ProjectClient) GetProject(name string) (Project, error) {

	//Construct the composite key to select the entry
	key := ProjectKey{
		ProjectName: name,
	}
	value, err := db.DBconn.Read(v.storeName, key, v.tagMeta)
	if err != nil {
		return Project{}, pkgerrors.Wrap(err, "Get Project")
	}

	//value is a byte array
	if value != nil {
		proj := Project{}
		err = db.DBconn.Unmarshal(value, &proj)
		if err != nil {
			return Project{}, pkgerrors.Wrap(err, "Unmarshaling Value")
		}
		return proj, nil
	}

	return Project{}, pkgerrors.New("Error getting Project")
}

// DeleteProject the  Project from database
func (v *ProjectClient) DeleteProject(name string) error {

	//Construct the composite key to select the entry
	key := ProjectKey{
		ProjectName: name,
	}
	err := db.DBconn.Delete(v.storeName, key, v.tagMeta)
	if err != nil {
		return pkgerrors.Wrap(err, "Delete Project Entry;")
	}

	//TODO: Delete the collection when the project is deleted
	return nil
}