package logic

import (
	"context"
	"fmt"
	"github.com/go-oauth2/oauth2/v4"
	"github.com/nspcc-dev/neo-go/pkg/util"
)

type InMemoryClient struct {
	UserID   string
	Domain   string
	IsPublic bool
}

var clients map[string]InMemoryClient

func AddInMemoryClient(id, userId, domain string, isPublic bool) error {
	result := InMemoryClient{
		UserID:   userId,
		Domain:   domain,
		IsPublic: isPublic,
	}
	_, contains := clients[id]
	if contains {
		return fmt.Errorf("client with id %s already exist", id)
	} else {
		clients[id] = result
		return nil
	}
}

func GetInMemoryClient(id string) (*InMemoryClient, error) {
	result, contains := clients[id]
	if contains {
		return &result, nil
	} else {
		return nil, fmt.Errorf("client with id %s not found", id)
	}
}

func UpdateInMemoryClientById(id string, client InMemoryClient) error {
	_, contains := clients[id]
	if !contains {
		return fmt.Errorf("client with id %s not found", id)
	} else {
		clients[id] = client
		return nil
	}
}

func DeleteInMemoryClient(id string) {
	delete(clients, id)
}

type StorageClientInfo struct {
	Id     string
	Secret string
}

func (model StorageClientInfo) GetID() string {
	return model.Id
}

func (model StorageClientInfo) GetSecret() string {
	return model.Secret
}

func (model StorageClientInfo) GetDomain() string {
	client, _ := GetInMemoryClient(model.Id)
	return client.Domain
}

func (model StorageClientInfo) IsPublic() bool {
	client, _ := GetInMemoryClient(model.Id)
	return client.IsPublic
}

func (model StorageClientInfo) GetUserID() string {
	client, _ := GetInMemoryClient(model.Id)
	return client.UserID
}

type IBlockchainStorage interface {
	GetByID(ctx context.Context, id string) (oauth2.ClientInfo, error) // read
	Set(clt oauth2.ClientInfo) error                                   // create and update
	Delete(id string) error                                            // delete
	CheckPassword(id string, secret string) (bool, error)              // CheckUser
}

type BlockchainStorage struct {
	contract *Contract
}

func NewBlockchainStorage(actor Actor, hash util.Uint160) *BlockchainStorage {
	return &BlockchainStorage{contract: New(actor, hash)}
}

func (storage BlockchainStorage) GetByID(ctx context.Context, id string) (oauth2.ClientInfo, error) {
	password, err := storage.contract.GetUser(id)
	if err != nil {
		return nil, err
	}

	return &StorageClientInfo{Id: id, Secret: password.StringLE()}, nil
}

func (storage BlockchainStorage) Set(clt oauth2.ClientInfo) error {
	password, decodeErr := util.Uint256DecodeStringLE(clt.GetSecret())
	if decodeErr != nil {
		return decodeErr
	}

	_, _, err := storage.contract.UpdateUser(clt.GetID(), password)
	if err != nil {
		_, _, err = storage.contract.CreateUser(clt.GetID(), password)

		if err != nil {
			return err
		}
	}

	return nil
}

func (storage BlockchainStorage) Delete(id string) error {
	// should we use hash and ValidUntilBlock?
	_, _, res := storage.contract.DeleteUser(id)
	return res
}

func (storage BlockchainStorage) CheckPassword(id string, secret string) (bool, error) {
	password, decodeErr := util.Uint256DecodeStringLE(secret)
	if decodeErr != nil {
		return false, decodeErr
	}

	_, err := storage.contract.CheckUser(id, password)
	if err != nil {
		return false, err
	}

	return true, nil
}