package manager

import (
	"fmt"
	"strings"

	"github.com/golang/protobuf/ptypes"
	structpb "github.com/golang/protobuf/ptypes/struct"
	"golang.org/x/oauth2"
	"google.golang.org/protobuf/types/known/anypb"
	"google.golang.org/protobuf/types/known/wrapperspb"

	"github.com/pomerium/pomerium/pkg/grpc/session"
)

func toAny(value interface{}) (*anypb.Any, error) {
	switch v := value.(type) {
	case bool:
		return ptypes.MarshalAny(&wrapperspb.BoolValue{Value: v})
	case []byte:
		return ptypes.MarshalAny(&wrapperspb.BytesValue{Value: v})
	case float64:
		return ptypes.MarshalAny(&wrapperspb.DoubleValue{Value: v})
	case float32:
		return ptypes.MarshalAny(&wrapperspb.FloatValue{Value: v})
	case int32:
		return ptypes.MarshalAny(&wrapperspb.Int32Value{Value: v})
	case int64:
		return ptypes.MarshalAny(&wrapperspb.Int64Value{Value: v})
	case string:
		return ptypes.MarshalAny(&wrapperspb.StringValue{Value: v})
	case uint32:
		return ptypes.MarshalAny(&wrapperspb.UInt32Value{Value: v})
	case uint64:
		return ptypes.MarshalAny(&wrapperspb.UInt64Value{Value: v})

	case []interface{}:
		lst := &structpb.ListValue{}
		for _, c := range v {
			if cv, err := toValue(c); err == nil {
				lst.Values = append(lst.Values, cv)
			}
		}
		return ptypes.MarshalAny(lst)
	}
	return nil, fmt.Errorf("unknown type %T", value)
}

func toValue(value interface{}) (*structpb.Value, error) {
	switch v := value.(type) {
	case bool:
		return &structpb.Value{
			Kind: &structpb.Value_BoolValue{BoolValue: v},
		}, nil
	case float64:
		return &structpb.Value{
			Kind: &structpb.Value_NumberValue{NumberValue: v},
		}, nil
	case float32:
		return &structpb.Value{
			Kind: &structpb.Value_NumberValue{NumberValue: float64(v)},
		}, nil
	case int32:
		return &structpb.Value{
			Kind: &structpb.Value_NumberValue{NumberValue: float64(v)},
		}, nil
	case int64:
		return &structpb.Value{
			Kind: &structpb.Value_NumberValue{NumberValue: float64(v)},
		}, nil
	case string:
		return &structpb.Value{
			Kind: &structpb.Value_StringValue{StringValue: v},
		}, nil
	case uint32:
		return &structpb.Value{
			Kind: &structpb.Value_NumberValue{NumberValue: float64(v)},
		}, nil
	case uint64:
		return &structpb.Value{
			Kind: &structpb.Value_NumberValue{NumberValue: float64(v)},
		}, nil

	}
	return nil, fmt.Errorf("unknown type %T", value)
}

func toSessionSchedulerKey(userID, sessionID string) string {
	return userID + "\037" + sessionID
}

func fromSessionSchedulerKey(key string) (userID, sessionID string) {
	idx := strings.Index(key, "\037")
	if idx >= 0 {
		userID = key[:idx]
		sessionID = key[idx+1:]
	} else {
		userID = key
	}
	return userID, sessionID
}

// FromOAuthToken converts a session oauth token to oauth2.Token.
func FromOAuthToken(token *session.OAuthToken) *oauth2.Token {
	expiry, _ := ptypes.Timestamp(token.GetExpiresAt())
	return &oauth2.Token{
		AccessToken:  token.GetAccessToken(),
		TokenType:    token.GetTokenType(),
		RefreshToken: token.GetRefreshToken(),
		Expiry:       expiry,
	}
}

// ToOAuthToken converts an oauth2.Token to a session oauth token.
func ToOAuthToken(token *oauth2.Token) *session.OAuthToken {
	expiry, _ := ptypes.TimestampProto(token.Expiry)
	return &session.OAuthToken{
		AccessToken:  token.AccessToken,
		TokenType:    token.TokenType,
		RefreshToken: token.RefreshToken,
		ExpiresAt:    expiry,
	}
}