package eu.dnetlib.repo.manager.service.security;

import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import eu.dnetlib.repo.manager.domain.dto.User;
import eu.dnetlib.repo.manager.exception.ResourceNotFoundException;
import eu.dnetlib.repo.manager.service.aai.registry.AaiRegistryService;
import org.mitre.openid.connect.model.OIDCAuthenticationToken;
import org.mitre.openid.connect.model.UserInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

@Service("authorizationService")
public class AuthorizationServiceImpl implements AuthorizationService {

    public static final String SUPER_ADMINISTRATOR = "SUPER_ADMINISTRATOR";
    public static final String CONTENT_PROVIDER_DASHBOARD_ADMINISTRATOR = "CONTENT_PROVIDER_DASHBOARD_ADMINISTRATOR";
    public static final String REGISTERED_USER = "REGISTERED_USER";

    private final RoleMappingService roleMappingService;
    private final AaiRegistryService aaiRegistryService;
    private final AuthoritiesUpdater authoritiesUpdater;

    @Autowired
    AuthorizationServiceImpl(RoleMappingService roleMappingService, AaiRegistryService aaiRegistryService,
                             AuthoritiesUpdater authoritiesUpdater) {
        this.roleMappingService = roleMappingService;
        this.aaiRegistryService = aaiRegistryService;
        this.authoritiesUpdater = authoritiesUpdater;
    }

    private String mapType(String type) {
        if (type.equals("datasource")) {
            type = "datasource";
        }
        return type;
    }

    /**
     * Type = DATASOURCE
     */
    @Override
    public String member(String type, String id) {
        return mapType(type).toUpperCase() + "_" + id.toUpperCase();
    }

    @Override
    public boolean isMemberOf(String repoId) {
        String repoRole = roleMappingService.convertRepoIdToEncodedAuthorityId(repoId);
        return SecurityContextHolder.getContext().getAuthentication().getAuthorities()
                .stream().anyMatch(authority -> authority.toString().equals(repoRole));
    }

    @Override
    public boolean isMemberOfInterface(String interfaceId) {

        //TODO blame Konstantinos Spyrou. He forced my hand...
        String repoId = interfaceId.split("::")[1] + "::" + interfaceId.split("::")[2];

        return isMemberOf(repoId);
    }

    @Override
    public List<User> getAdminsOfRepo(String repoId) {
        List<String> userList = new ArrayList<>();

        // find couId by role name
        String role = roleMappingService.getRoleIdByRepoId(repoId);
        Integer couId = aaiRegistryService.getCouId(role);
        if (couId != null) {
            JsonArray users = aaiRegistryService.getUsersByCouId(couId);
            for (JsonElement jsonElement : users) {
                userList.add(jsonElement.toString());
            }
        }
        return aaiRegistryService.getUsers(couId);
    }


    @Override
    public boolean addAdmin(String id, String email) throws ResourceNotFoundException {
        Integer coPersonId = aaiRegistryService.getCoPersonIdByEmail(email);
        if (coPersonId != null) {
            String role = roleMappingService.getRoleIdByRepoId(id);
            Integer couId = aaiRegistryService.getCouId(role);
            if (couId != null) {
                Integer roleId = aaiRegistryService.getRoleId(coPersonId, couId);
                aaiRegistryService.assignMemberRole(coPersonId, couId, roleId);

                // Add role to user current authorities
                authoritiesUpdater.addRole(email, roleMappingService.convertRepoIdToAuthority(id));

                return true;
            } else {
                throw new ResourceNotFoundException("Cannot find CouId for role: " + role);
            }
        } else {
            throw new ResourceNotFoundException("Cannot find coPersonId for user with email: " + email);
        }
    }

    @Override
    public boolean removeAdmin(String id, String email) throws ResourceNotFoundException {
        Integer coPersonId = aaiRegistryService.getCoPersonIdByEmail(email);
        if (coPersonId != null) {
            String role = roleMappingService.getRoleIdByRepoId(id);
            Integer couId = aaiRegistryService.getCouId(role);
            Integer roleId = null;
            if (couId != null) {
                roleId = aaiRegistryService.getRoleId(coPersonId, couId);
            }
            if (couId != null && roleId != null) {
                aaiRegistryService.removeMemberRole(coPersonId, couId, roleId);

                // Remove role from user current authorities
                authoritiesUpdater.removeRole(email, roleMappingService.convertRepoIdToAuthority(id));

                return true;
            } else {
                throw new ResourceNotFoundException("Cannot find CouId for role: " + role);
            }
        } else {
            throw new ResourceNotFoundException("Cannot find coPersonId for user with email: " + email);
        }
    }

    @Override
    public Collection<String> getUserRoles() {
        List<String> roles;
        JsonArray entitlements;
        UserInfo userInfo = ((OIDCAuthenticationToken) SecurityContextHolder.getContext().getAuthentication()).getUserInfo();
        if (userInfo.getSource().getAsJsonArray("edu_person_entitlements") != null) {
            entitlements = userInfo.getSource().getAsJsonArray("edu_person_entitlements");
        } else if (userInfo.getSource().getAsJsonArray("eduperson_entitlement") != null) {
            entitlements = userInfo.getSource().getAsJsonArray("eduperson_entitlement");
        } else {
            entitlements = new JsonArray();
        }
        roles = AuthoritiesMapper.entitlementRoles(entitlements);
        return roles;
    }

    @Override
    public Collection<String> getUserRoles(String email) {
        int coPersonId = aaiRegistryService.getCoPersonIdByEmail(email);
        List<Integer> list = new ArrayList<>();
        for (JsonElement element : aaiRegistryService.getRolesWithStatus(coPersonId, AaiRegistryService.RoleStatus.ACTIVE)) {
            list.add(element.getAsJsonObject().get("CouId").getAsInt());
        }
        return aaiRegistryService.getCouNames(list).values();
    }

}