package org.keycloak.protocol.cas.mappers;

import org.keycloak.models.*;
import org.keycloak.protocol.ProtocolMapperUtils;
import org.keycloak.protocol.oidc.mappers.OIDCAttributeMapperHelper;
import org.keycloak.provider.ProviderConfigProperty;
import org.keycloak.representations.AccessToken;
import org.keycloak.utils.RoleResolveUtil;

import java.util.*;
import java.util.stream.Collectors;

public class UserClientRoleMappingMapper extends AbstractUserRoleMappingMapper {

    public static final String PROVIDER_ID = "cas-usermodel-client-role-mapper";

    private static final List<ProviderConfigProperty> CONFIG_PROPERTIES = new ArrayList<>();

    static {

        ProviderConfigProperty clientId = new ProviderConfigProperty();
        clientId.setName(ProtocolMapperUtils.USER_MODEL_CLIENT_ROLE_MAPPING_CLIENT_ID);
        clientId.setLabel(ProtocolMapperUtils.USER_MODEL_CLIENT_ROLE_MAPPING_CLIENT_ID_LABEL);
        clientId.setHelpText(ProtocolMapperUtils.USER_MODEL_CLIENT_ROLE_MAPPING_CLIENT_ID_HELP_TEXT);
        clientId.setType(ProviderConfigProperty.CLIENT_LIST_TYPE);
        CONFIG_PROPERTIES.add(clientId);

        ProviderConfigProperty clientRolePrefix = new ProviderConfigProperty();
        clientRolePrefix.setName(ProtocolMapperUtils.USER_MODEL_CLIENT_ROLE_MAPPING_ROLE_PREFIX);
        clientRolePrefix.setLabel(ProtocolMapperUtils.USER_MODEL_CLIENT_ROLE_MAPPING_ROLE_PREFIX_LABEL);
        clientRolePrefix.setHelpText(ProtocolMapperUtils.USER_MODEL_CLIENT_ROLE_MAPPING_ROLE_PREFIX_HELP_TEXT);
        clientRolePrefix.setType(ProviderConfigProperty.STRING_TYPE);
        CONFIG_PROPERTIES.add(clientRolePrefix);

        OIDCAttributeMapperHelper.addTokenClaimNameConfig(CONFIG_PROPERTIES);
    }

    @Override
    public List<ProviderConfigProperty> getConfigProperties() {
        return CONFIG_PROPERTIES;
    }

    @Override
    public String getId() {
        return PROVIDER_ID;
    }

    @Override
    public String getDisplayType() {
        return "User Client Role";
    }

    @Override
    public String getDisplayCategory() {
        return TOKEN_MAPPER_CATEGORY;
    }

    @Override
    public String getHelpText() {
        return "Map a user client role to a token claim.";
    }

    @Override
    public void setAttribute(Map<String, Object> attributes, ProtocolMapperModel mappingModel, UserSessionModel userSession,
                             KeycloakSession session, ClientSessionContext clientSessionCtx) {
        String clientId = mappingModel.getConfig().get(ProtocolMapperUtils.USER_MODEL_CLIENT_ROLE_MAPPING_CLIENT_ID);
        String rolePrefix = mappingModel.getConfig().get(ProtocolMapperUtils.USER_MODEL_CLIENT_ROLE_MAPPING_ROLE_PREFIX);

        if (clientId != null && !clientId.isEmpty()) {
            AccessToken.Access access = RoleResolveUtil.getResolvedClientRoles(session, clientSessionCtx, clientId, false);
            if (access == null) {
                return;
            }
            setAttribute(attributes, mappingModel, access.getRoles(), rolePrefix);
        } else {
            // If clientId is not specified, we consider all clients
            Map<String, AccessToken.Access> allAccess = RoleResolveUtil.getAllResolvedClientRoles(session, clientSessionCtx);
            Set<String> allRoles = allAccess.values().stream().filter(Objects::nonNull)
                    .flatMap(access -> access.getRoles().stream())
                    .collect(Collectors.toSet());
            setAttribute(attributes, mappingModel, allRoles, rolePrefix);
        }
    }

    public static ProtocolMapperModel create(String clientId, String clientRolePrefix,
                                             String name, String tokenClaimName) {
        ProtocolMapperModel mapper = CASAttributeMapperHelper.createClaimMapper(name, tokenClaimName,
                "String", PROVIDER_ID);
        mapper.getConfig().put(ProtocolMapperUtils.USER_MODEL_CLIENT_ROLE_MAPPING_CLIENT_ID, clientId);
        mapper.getConfig().put(ProtocolMapperUtils.USER_MODEL_CLIENT_ROLE_MAPPING_ROLE_PREFIX, clientRolePrefix);
        return mapper;
    }
}