/*
Copyright 2021 The KodeRover 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 mongodb

import (
	"context"
	"errors"
	"time"

	"github.com/koderover/zadig/pkg/setting"

	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"

	"github.com/koderover/zadig/pkg/microservice/aslan/config"
	"github.com/koderover/zadig/pkg/microservice/aslan/core/common/repository/models"
	mongotool "github.com/koderover/zadig/pkg/tool/mongo"
)

type RenderSetListOption struct {
	// if Revision == 0 then search max revision of RenderSet
	ProductTmpl   string
	Revisions     []int64
	RendersetName string
	FindOpts      []RenderSetFindOption
}

// RenderSetFindOption ...
type RenderSetFindOption struct {
	// if Revision == 0 then search max revision of RenderSet
	ProductTmpl       string
	EnvName           string
	IsDefault         bool
	Revision          int64
	Name              string
	YamlVariableSetID string
}

type RenderSetPipeResp struct {
	RenderSet struct {
		Name        string `bson:"name"                     json:"name"`
		ProductTmpl string `bson:"product_tmpl"             json:"product_tmpl"`
	} `bson:"_id"      json:"render_set"`
	Revision int64 `bson:"revision"     json:"revision"`
}

type RenderSetColl struct {
	*mongo.Collection

	coll string
}

func NewRenderSetColl() *RenderSetColl {
	name := models.RenderSet{}.TableName()
	return &RenderSetColl{Collection: mongotool.Database(config.MongoDatabase()).Collection(name), coll: name}
}

func (c *RenderSetColl) GetCollectionName() string {
	return c.coll
}

func (c *RenderSetColl) EnsureIndex(ctx context.Context) error {
	mod := mongo.IndexModel{
		Keys: bson.D{
			bson.E{Key: "name", Value: 1},
			bson.E{Key: "revision", Value: 1},
		},
		Options: options.Index().SetUnique(true),
	}

	_, err := c.Indexes().CreateOne(ctx, mod)

	return err
}

func (c *RenderSetColl) ListByFindOpts(opt *RenderSetListOption) ([]models.RenderSet, error) {
	var resp []models.RenderSet
	condition := bson.A{}
	if len(opt.FindOpts) == 0 {
		return nil, nil
	}
	for _, findOpt := range opt.FindOpts {
		singleCondition := bson.M{
			"name":     findOpt.Name,
			"revision": findOpt.Revision,
		}
		if len(findOpt.YamlVariableSetID) > 0 {
			singleCondition["yaml_data.source"] = setting.SourceFromVariableSet
			singleCondition["yaml_data.source_id"] = findOpt.YamlVariableSetID
		}
		condition = append(condition, singleCondition)
	}
	projectCon := bson.A{}
	projectCon = append(projectCon, bson.M{"product_tmpl": opt.ProductTmpl})
	filter := bson.D{{"$or", condition}, {"$and", projectCon}}
	cursor, err := c.Collection.Find(context.TODO(), filter)
	if err == mongo.ErrNoDocuments {
		return nil, nil
	}
	if err != nil {
		return nil, err
	}
	if err := cursor.All(context.TODO(), &resp); err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *RenderSetColl) FindRenderSet(opt *RenderSetFindOption) (*models.RenderSet, bool, error) {
	res, err := c.Find(opt)
	if err != nil {
		if err == mongo.ErrNoDocuments {
			return nil, false, nil
		}
		return nil, false, err
	}

	return res, true, nil
}

func (c *RenderSetColl) Find(opt *RenderSetFindOption) (*models.RenderSet, error) {
	if opt == nil {
		return nil, errors.New("RenderSetFindOption cannot be nil")
	}

	query := bson.M{"name": opt.Name}
	opts := options.FindOne()
	if opt.Revision > 0 {
		// revisionName + revision are enough to locate the target record
		// there is no need to set other query condition
		// Note. the query logic has been rolled back to 1.12.0
		query["revision"] = opt.Revision
	} else {
		opts.SetSort(bson.D{{"revision", -1}})

		if len(opt.EnvName) > 0 {
			query["env_name"] = opt.EnvName
		}

		if len(opt.ProductTmpl) > 0 {
			query["product_tmpl"] = opt.ProductTmpl
		}

		if opt.IsDefault {
			query["is_default"] = opt.IsDefault
		}
	}

	rs := &models.RenderSet{}
	err := c.FindOne(context.TODO(), query, opts).Decode(&rs)
	if err != nil {
		return nil, err
	}

	return rs, err
}

func (c *RenderSetColl) Create(args *models.RenderSet) error {
	if args == nil {
		return errors.New("RenderSet cannot be nil")
	}
	args.UpdateTime = time.Now().Unix()
	_, err := c.InsertOne(context.TODO(), args)

	return err
}

// use it in caution, it won't update revision
func (c *RenderSetColl) Update(args *models.RenderSet) error {
	query := bson.M{"name": args.Name, "revision": args.Revision}
	change := bson.M{"$set": bson.M{
		"chart_infos":       args.ChartInfos,
		"service_variables": args.ServiceVariables,
		"update_time":       time.Now().Unix(),
		"update_by":         args.UpdateBy,
	}}

	_, err := c.UpdateOne(context.TODO(), query, change)

	return err
}

func (c *RenderSetColl) SetDefault(renderTmplName, productTmplName string) error {
	query := bson.M{"name": renderTmplName, "product_tmpl": productTmplName}
	change := bson.M{"$set": bson.M{
		"is_default": true,
	}}

	if _, err := c.UpdateMany(context.TODO(), query, change); err != nil {
		return err
	}

	notEq := bson.M{"name": bson.M{"$ne": renderTmplName}, "product_tmpl": productTmplName}
	falseChange := bson.M{"$set": bson.M{
		"is_default": false,
	}}

	_, err := c.UpdateMany(context.TODO(), notEq, falseChange)
	return err
}

// Delete 根据项目名称删除renderset
func (c *RenderSetColl) Delete(productName string) error {
	query := bson.M{"product_tmpl": productName}
	_, err := c.DeleteMany(context.TODO(), query)
	return err
}

// Delete renderSet According to productName、name and revision
func (c *RenderSetColl) DeleteRenderSet(productName, name string, revision int64) error {
	query := bson.M{"product_tmpl": productName, "name": name, "revision": revision}
	_, err := c.DeleteOne(context.TODO(), query)
	return err
}

func (c *RenderSetColl) ListAllRenders() ([]*models.RenderSet, error) {
	resp := make([]*models.RenderSet, 0)
	query := bson.M{}

	cursor, err := c.Collection.Find(context.TODO(), query)
	if err != nil {
		return nil, err
	}

	err = cursor.All(context.TODO(), &resp)
	if err != nil {
		return nil, err
	}

	return resp, err
}
