package v1

import (
	"context"
	"errors"

	"gitea.badhouseplants.net/softplayer/softplayer-backend/internal/controllers"
	tokens "gitea.badhouseplants.net/softplayer/softplayer-go-proto/pkg/tokens/v1"
	"google.golang.org/grpc"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
	"google.golang.org/protobuf/types/known/emptypb"
	"google.golang.org/protobuf/types/known/timestamppb"
)

// var _ tokens.TokensServiceServer = (*TokensServer)(nil)
type TokensServer struct {
	tokens.UnimplementedTokensServiceServer
	tokenCtrl         *controllers.TokenController
	authorizationCtrl *controllers.AuthController
}

func NewTokensServer(
	tokenCtrl *controllers.TokenController,
	authorizationCtrl *controllers.AuthController,
) *TokensServer {
	return &TokensServer{
		tokenCtrl:         tokenCtrl,
		authorizationCtrl: authorizationCtrl,
	}
}

// CreateToken implements [v1.TokensServiceServer].
func (srv *TokensServer) CreateToken(ctx context.Context, in *tokens.CreateTokenRequest) (*tokens.CreateTokenResponse, error) {
	claims, err := controllers.ClaimsFromContext(ctx)
	if err != nil {
		return nil, status.Error(codes.Aborted, "Context is invalid")
	}
	if claims.UserID == "" {
		return nil, status.Error(codes.Aborted, "Context is invalid")
	}

	if in.TokenPermissions == nil {
		return nil, status.Error(codes.InvalidArgument, "Permissions must be set")
	}
	permissions := map[string][]string{}
	for service, methods := range in.TokenPermissions.Permissions {
		permissions[service] = methods.GetMethods()
	}

	tokenData := &controllers.TokenData{
		Name:      in.TokenMetadata.GetName(),
		UserID:    claims.UserID,
		ExpiresAt: in.TokenMetadata.ExpiresAt.AsTime(),
		Scopes:    permissions,
	}

	token, tokenID, err := srv.tokenCtrl.Create(ctx, tokenData)
	if err != nil {
		if errors.Is(err, controllers.ErrServerError) {
			return nil, status.Error(codes.Internal, "Something is broken on our side")
		}
		return nil, status.Error(codes.Aborted, "Couldn't create a token")
	}

	return &tokens.CreateTokenResponse{
		TokenUuid: &tokens.TokenUUID{
			Uuid: tokenID,
		},
		TokenValue: &tokens.TokenValue{Token: token},
	}, nil
}

// ForceTokenExpiration implements [v1.TokensServiceServer].
func (srv *TokensServer) ForceTokenExpiration(ctx context.Context, in *tokens.ForceTokenExpirationRequest) (*emptypb.Empty, error) {
	claims, err := controllers.ClaimsFromContext(ctx)
	if err != nil {
		return nil, status.Error(codes.Aborted, "Context is invalid")
	}
	if claims.UserID == "" {
		return nil, status.Error(codes.Aborted, "Context is invalid")
	}

	if err := srv.tokenCtrl.VerifyTokenOwner(ctx, claims.UserID, in.TokenUuid.Uuid); err != nil {
		if errors.Is(err, controllers.ErrServerError) {
			return nil, status.Error(codes.Internal, "Something is broken on our side")
		}
		return nil, status.Error(codes.Aborted, "User is now allowed to manipulate this token")
	}

	if err := srv.tokenCtrl.ForceExpiration(ctx, in.TokenUuid.GetUuid()); err != nil {
		if errors.Is(err, controllers.ErrServerError) {
			return nil, status.Error(codes.Internal, "Something is broken on our side")
		}
		return nil, status.Error(codes.Aborted, "Couldn't create a token")
	}
	return &emptypb.Empty{}, nil
}

// GetToken implements [v1.TokensServiceServer].
func (srv *TokensServer) GetToken(ctx context.Context, in *tokens.GetTokenRequest) (*tokens.GetTokenResponse, error) {
	claims, err := controllers.ClaimsFromContext(ctx)
	if err != nil {
		return nil, status.Error(codes.Aborted, "Context is invalid")
	}
	if claims.UserID == "" {
		return nil, status.Error(codes.Aborted, "Context is invalid")
	}
	if err := srv.tokenCtrl.VerifyTokenOwner(ctx, claims.UserID, in.TokenUuid.Uuid); err != nil {
		if errors.Is(err, controllers.ErrServerError) {
			return nil, status.Error(codes.Internal, "Something is broken on our side")
		}
		return nil, status.Error(codes.Aborted, "User is now allowed to manipulate this token")
	}

	token, err := srv.tokenCtrl.Get(ctx, in.TokenUuid.Uuid, claims.UserID)
	if err != nil {
		if errors.Is(err, controllers.ErrServerError) {
			return nil, status.Error(codes.Internal, "Something is broken on our side")
		}
		return nil, status.Error(codes.Aborted, "Couldn't list tokens")
	}

	return &tokens.GetTokenResponse{
		TokenUuid: &tokens.TokenUUID{
			Uuid: token.UUID,
		},
		TokenMetadata: &tokens.TokenMetadata{
			Name:        token.Name,
			ExpiresAt:   timestamppb.New(token.ExpiresAt),
			LastUsedAt:  timestamppb.New(token.LastUsedAt),
			GeneratedAt: timestamppb.New(token.GeneratedAt),
			CreatedAt:   timestamppb.New(token.CreatedAt),
			RevokedAt:   timestamppb.New(token.RevokedAt),
		},
		TokenPermissions: &tokens.TokenPermissions{},
	}, nil
}

// ListTokens implements [v1.TokensServiceServer].
func (srv *TokensServer) ListTokens(in *emptypb.Empty, stream grpc.ServerStreamingServer[tokens.ListTokensResponse]) error {
	claims, err := controllers.ClaimsFromContext(stream.Context())
	if err != nil {
		return status.Error(codes.Aborted, "Context is invalid")
	}
	if claims.UserID == "" {
		return status.Error(codes.Aborted, "Context is invalid")
	}

	tokensRes, err := srv.tokenCtrl.List(stream.Context(), claims.UserID)
	if err != nil {
		if errors.Is(err, controllers.ErrServerError) {
			return status.Error(codes.Internal, "Something is broken on our side")
		}
		return status.Error(codes.Aborted, "Couldn't list tokens")
	}

	for _, tokenRes := range tokensRes {
		if err := stream.Send(&tokens.ListTokensResponse{
			TokenUuid: &tokens.TokenUUID{
				Uuid: tokenRes.UUID,
			},
			TokenMetadata: &tokens.TokenMetadata{
				Name:        tokenRes.Name,
				ExpiresAt:   timestamppb.New(tokenRes.ExpiresAt),
				LastUsedAt:  timestamppb.New(tokenRes.LastUsedAt),
				GeneratedAt: timestamppb.New(tokenRes.GeneratedAt),
				CreatedAt:   timestamppb.New(tokenRes.CreatedAt),
				RevokedAt:   timestamppb.New(tokenRes.RevokedAt),
			},
		}); err != nil {
			return status.Error(codes.Aborted, "Couldn't send data")
		}
	}
	return nil
}

// RegenerateToken implements [v1.TokensServiceServer].
func (srv *TokensServer) RegenerateToken(ctx context.Context, in *tokens.RegenerateTokenRequest) (*tokens.RegenerateTokenResponse, error) {
	claims, err := controllers.ClaimsFromContext(ctx)
	if err != nil {
		return nil, status.Error(codes.Aborted, "Context is invalid")
	}
	if claims.UserID == "" {
		return nil, status.Error(codes.Aborted, "Context is invalid")
	}
	if err := srv.tokenCtrl.VerifyTokenOwner(ctx, claims.UserID, in.TokenUuid.Uuid); err != nil {
		if errors.Is(err, controllers.ErrServerError) {
			return nil, status.Error(codes.Internal, "Something is broken on our side")
		}
		return nil, status.Error(codes.Aborted, "User is now allowed to manipulate this token")
	}

	tokenVal, err := srv.tokenCtrl.Regenerate(ctx, in.TokenUuid.GetUuid())
	if err != nil {
		if errors.Is(err, controllers.ErrServerError) {
			return nil, status.Error(codes.Internal, "Something is broken on our side")
		}
		return nil, status.Error(codes.Aborted, "Couldn't list tokens")
	}
	return &tokens.RegenerateTokenResponse{
		TokenValue: &tokens.TokenValue{
			Token: tokenVal,
		},
	}, nil
}

// UpdateToken implements [v1.TokensServiceServer].
func (srv *TokensServer) UpdateToken(ctx context.Context, in *tokens.UpdateTokenRequest) (*tokens.UpdateTokenResponse, error) {
	claims, err := controllers.ClaimsFromContext(ctx)
	if err != nil {
		return nil, status.Error(codes.Aborted, "Context is invalid")
	}
	if claims.UserID == "" {
		return nil, status.Error(codes.Aborted, "Context is invalid")
	}

	if err := srv.tokenCtrl.VerifyTokenOwner(ctx, claims.UserID, in.TokenUuid.Uuid); err != nil {
		if errors.Is(err, controllers.ErrServerError) {
			return nil, status.Error(codes.Internal, "Something is broken on our side")
		}
		return nil, status.Error(codes.Aborted, "User is now allowed to manipulate this token")
	}
	if in.TokenPermissions == nil {
		return nil, status.Error(codes.InvalidArgument, "Permissions must be set")
	}

	permissions := map[string][]string{}
	for service, methods := range in.TokenPermissions.Permissions {
		permissions[service] = methods.GetMethods()
	}
	tokenData := &controllers.TokenData{
		Name:   in.TokenMetadata.Name,
		Scopes: permissions,
	}
	if err := srv.tokenCtrl.Update(ctx, tokenData); err != nil {
		if errors.Is(err, controllers.ErrServerError) {
			return nil, status.Error(codes.Internal, "Something is broken on our side")
		}
		return nil, status.Error(codes.Aborted, "Couldn't list tokens")
	}
	return &tokens.UpdateTokenResponse{
		TokenUuid:        &tokens.TokenUUID{},
		TokenMetadata:    &tokens.TokenMetadata{},
		TokenPermissions: &tokens.TokenPermissions{},
	}, nil
}

// ListPermissions implements [v1.TokensServiceServer].
func (srv *TokensServer) ListPermissions(in *emptypb.Empty, stream grpc.ServerStreamingServer[tokens.ListPermissionsResponse]) error {
	data := srv.tokenCtrl.ListPermissions(stream.Context())
	for key, data := range data {
		result := &tokens.ListPermissionsResponse{
			Permissions: &tokens.TokenPermissions{
				Permissions: map[string]*tokens.MethodList{
					key: {Methods: data},
				},
			},
		}
		if err := stream.Send(result); err != nil {
			return status.Error(codes.Aborted, "Couldn't send data to the client")
		}
	}
	return nil
}