package mongo

import (
	"context"
	"fmt"
	"time"

	"git.acooldomain.co/server-manager/backend/dbhandler"
	"git.acooldomain.co/server-manager/backend/models"
	"go.mongodb.org/mongo-driver/bson"
	"go.mongodb.org/mongo-driver/mongo"
	"go.mongodb.org/mongo-driver/mongo/options"
)

type ServerPermissions struct {
	Username    string            `bson:"username"`
	ServerId    string            `bson:"server_id"`
	Permissions models.Permission `bson:"permissions"`
}

type ServersAuthorizationDbHandler struct {
	dbhandler.ServersAuthorizationDbHandler
	collection *mongo.Collection
}

func (self *ServersAuthorizationDbHandler) RemoveUser(ctx context.Context, username string) error {
	_, err := self.collection.DeleteMany(
		ctx,
		bson.M{
			"username": username,
		},
	)

	return err
}

func (self *ServersAuthorizationDbHandler) RemoveServer(ctx context.Context, serverId string) error {
	_, err := self.collection.DeleteMany(
		ctx,
		bson.M{
			"server_id": serverId,
		},
	)

	return err
}

func (self *ServersAuthorizationDbHandler) AddPermissions(ctx context.Context, username string, serverId string, permissions models.Permission) error {
	var serverPermissions ServerPermissions
	err := self.collection.FindOne(
		ctx,
		bson.M{
			"username":  username,
			"server_id": serverId,
		},
	).Decode(&serverPermissions)

	if err != nil {
		return err
	}

	newPermissions := serverPermissions.Permissions | permissions

	_, err = self.collection.UpdateOne(
		ctx,
		bson.M{
			"username":  username,
			"server_id": serverId,
		},
		bson.M{"$set": bson.M{
			"permissions": newPermissions,
		},
		},
	)

	return err
}

func (self *ServersAuthorizationDbHandler) RemovePermissions(ctx context.Context, username string, serverId string, permissions models.Permission) error {
	var serverPermissions ServerPermissions
	err := self.collection.FindOne(
		ctx,
		bson.M{
			"username":  username,
			"server_id": serverId,
		},
	).Decode(&serverPermissions)

	if err != nil {
		return err
	}

	newPermissions := serverPermissions.Permissions | permissions ^ permissions

	_, err = self.collection.UpdateOne(
		ctx,
		bson.M{
			"username":  username,
			"server_id": serverId,
		},
		bson.M{"$set": bson.M{
			"permissions": newPermissions,
		},
		},
	)

	return err
}

func (self *ServersAuthorizationDbHandler) SetPermissions(ctx context.Context, username string, serverId string, permissions models.Permission) error {
	_, err := self.collection.UpdateOne(
		ctx,
		bson.M{
			"username":  username,
			"server_id": serverId,
		},
		bson.M{"$set": bson.M{
			"permissions": permissions,
		},
		},
	)

	return err
}

func (self *ServersAuthorizationDbHandler) GetPermissions(ctx context.Context, username string, serverId string) (models.Permission, error) {
	var serverPermissions ServerPermissions
	err := self.collection.FindOne(
		ctx,
		bson.M{
			"username":  username,
			"server_id": serverId,
		},
	).Decode(&serverPermissions)

	if err != nil {
		return 0, err
	}

	return serverPermissions.Permissions, nil
}

func NewServersAuthorizationHandler(config models.MongoDBConfig) (*ServersAuthorizationDbHandler, error) {
	clientOptions := options.Client().ApplyURI(config.Url).SetAuth(options.Credential{
		Username: config.Username,
		Password: config.Password,
	})

	ctx, cancel := context.WithTimeoutCause(context.Background(), 30*time.Second, fmt.Errorf("Timeout"))
	defer cancel()

	client, err := mongo.Connect(ctx, clientOptions)

	if err != nil {
		return nil, err
	}

	return &ServersAuthorizationDbHandler{
		collection: client.Database(config.Database).Collection(config.Collection),
	}, nil
}