package main

import (
	"github.com/casbin/casbin/v2"
	"github.com/ditchx/mongodb-adapter/v2"
)

func main() {
	// Initialize a MongoDB adapter and use it in a Casbin enforcer:
	// The adapter will use the database named "casbin".
	// If it doesn't exist, the adapter will create it automatically.
	a := mongodbadapter.NewAdapter("mongodb://127.0.0.1:27017") // Your MongoDB URL.

	// Or you can use an existing DB "abc" like this:
	// The adapter will use the table named "casbin_rule".
	// If it doesn't exist, the adapter will create it automatically.
	// a := mongodbadapter.NewAdapter("mongodb://127.0.0.1:27017", mongodbadapter.DBName("abc") )

	// You can also pass a connected *mongo.Client if you want to reuse one.
	// The adapter will not be responsible for automatically connecting/disconnecting the client, though.
	// client, _ := mongo.Connect(context.Background(), options.Client().ApplyURI("mongodb://127.0.0.1:27017"))
	// a := mongodbadapter.NewAdapterFromClient(client, mongodbadapter.DBName("abc") )

	e, err := casbin.NewEnforcer("examples/rbac_model.conf", a)
	if err != nil {
		panic(err)
	}


	// Load the policy from DB.
	e.LoadPolicy()

	// Check the permission.
	e.Enforce("alice", "data1", "read")

	// Modify the policy.
	// e.AddPolicy(...)
	// e.RemovePolicy(...)

	// Save the policy back to DB.
	e.SavePolicy()
}

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

// This adapter also implements the FilteredAdapter interface. This allows for
// efficent, scalable enforcement of very large policies:
filter := &bson.M{"v0": "alice"}
e.LoadFilteredPolicy(filter)

// The loaded policy is now a subset of the policy in storage, containing only
// the policy lines that match the provided filter. This filter should be a
// valid MongoDB selector using BSON. A filtered policy cannot be saved.