/*
 * 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"
)

// GenericPlacementIntent shall have 2 fields - metadata and spec
type GenericPlacementIntent struct {
	MetaData GenIntentMetaData `json:"metadata"`
	Spec     GenIntentSpecData `json:"spec"`
}

// GenIntentMetaData has name, description, userdata1, userdata2
type GenIntentMetaData struct {
	Name        string `json:"name"`
	Description string `json:"description"`
	UserData1   string `json:"userData1"`
	UserData2   string `json:"userData2"`
}

// GenIntentSpecData has logical-cloud-name
type GenIntentSpecData struct {
	LogicalCloud string `json:"logical-cloud"`
}

// GenericPlacementIntentManager is an interface which exposes the GenericPlacementIntentManager functionality
type GenericPlacementIntentManager interface {
	CreateGenericPlacementIntent(g GenericPlacementIntent, p string, ca string,
		v string) (GenericPlacementIntent, error)
	GetGenericPlacementIntent(intentName string, projectName string,
		compositeAppName string, version string) (GenericPlacementIntent, error)
	DeleteGenericPlacementIntent(intentName string, projectName string,
		compositeAppName string, version string) error
}

// GenericPlacementIntentKey is used as the primary key
type GenericPlacementIntentKey struct {
	Name         string `json:"genericplacement"`
	Project      string `json:"project"`
	CompositeApp string `json:"compositeapp"`
	Version      string `json:"compositeappversion"`
}

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

// GenericPlacementIntentClient implements the GenericPlacementIntentManager interface
type GenericPlacementIntentClient struct {
	storeName   string
	tagMetaData string
}

// NewGenericPlacementIntentClient return an instance of GenericPlacementIntentClient which implements GenericPlacementIntentManager
func NewGenericPlacementIntentClient() *GenericPlacementIntentClient {
	return &GenericPlacementIntentClient{
		storeName:   "orchestrator",
		tagMetaData: "genericplacementintentmetadata",
	}
}

// CreateGenericPlacementIntent creates an entry for GenericPlacementIntent in the database. Other Input parameters for it - projectName, compositeAppName, version
func (c *GenericPlacementIntentClient) CreateGenericPlacementIntent(g GenericPlacementIntent, p string, ca string,
	v string) (GenericPlacementIntent, error) {

	// check if the genericPlacement already exists.
	res, err := c.GetGenericPlacementIntent(g.MetaData.Name, p, ca, v)
	if res != (GenericPlacementIntent{}) {
		return GenericPlacementIntent{}, pkgerrors.New("Intent already exists")
	}

	//Check if project exists
	_, err = NewProjectClient().GetProject(p)
	if err != nil {
		return GenericPlacementIntent{}, pkgerrors.New("Unable to find the project")
	}

	// check if compositeApp exists
	_, err = NewCompositeAppClient().GetCompositeApp(ca, v, p)
	if err != nil {
		return GenericPlacementIntent{}, pkgerrors.New("Unable to find the composite-app")
	}

	gkey := GenericPlacementIntentKey{
		Name:         g.MetaData.Name,
		Project:      p,
		CompositeApp: ca,
		Version:      v,
	}

	err = db.DBconn.Insert(c.storeName, gkey, nil, c.tagMetaData, g)
	if err != nil {
		return GenericPlacementIntent{}, pkgerrors.Wrap(err, "Create DB entry error")
	}

	return g, nil
}

// GetGenericPlacementIntent shall take arguments - name of the intent, name of the project, name of the composite app and version of the composite app. It shall return the genericPlacementIntent if its present.
func (c *GenericPlacementIntentClient) GetGenericPlacementIntent(i string, p string, ca string, v string) (GenericPlacementIntent, error) {
	key := GenericPlacementIntentKey{
		Name:         i,
		Project:      p,
		CompositeApp: ca,
		Version:      v,
	}

	result, err := db.DBconn.Find(c.storeName, key, c.tagMetaData)
	if err != nil {
		return GenericPlacementIntent{}, pkgerrors.Wrap(err, "Get Intent error")
	}

	if result != nil {
		g := GenericPlacementIntent{}
		err = db.DBconn.Unmarshal(result[0], &g)
		if err != nil {
			return GenericPlacementIntent{}, pkgerrors.Wrap(err, "Unmarshalling GenericPlacement Intent")
		}
		return g, nil
	}

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

}

// DeleteGenericPlacementIntent the intent from the database
func (c *GenericPlacementIntentClient) DeleteGenericPlacementIntent(i string, p string, ca string, v string) error {
	key := GenericPlacementIntentKey{
		Name:         i,
		Project:      p,
		CompositeApp: ca,
		Version:      v,
	}

	err := db.DBconn.Remove(c.storeName, key)
	if err != nil {
		return pkgerrors.Wrap(err, "Delete Project entry;")
	}
	return nil
}