package de.superx.bianalysis.service;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import de.superx.bianalysis.metadata.Identifier;
import de.superx.bianalysis.models.Right;
import de.superx.bianalysis.models.RightParam;
import de.superx.common.AccessDeniedException;
import de.superx.common.SxUser;
import de.superx.spring.service.UserService;

@Service()
public class BiAnalysisRightService {

    @Autowired
    DbMetaAdapter dbAdapter;
    
    @Autowired
    UserService userService;

    public void checkCreateRights() {
        SxUser user = (SxUser) userService.currentUserDetails();
        if ( user != null && !user.getHis1Rights().contains("RIGHT_CS_BIA_ANALYSIS_CREATE_ANALYSIS") &&
                !user.getHis1Rights().contains("RIGHT_CS_BIA_ANALYSIS_EDIT_ANALYSIS_TABLE")) {
            throw new AccessDeniedException("No right to access Create functions");
        }
    }

    public boolean isCreateRight() {
        SxUser user = (SxUser) userService.currentUserDetails();
        if ( user != null && !user.getHis1Rights().contains("RIGHT_CS_BIA_ANALYSIS_CREATE_ANALYSIS") &&
                !user.getHis1Rights().contains("RIGHT_CS_BIA_ANALYSIS_EDIT_ANALYSIS_TABLE")) {
            return false;
        }
        return true;
    }
    
    public void checkCreateOrViewRights() {
        SxUser user = (SxUser) userService.currentUserDetails();
        if ( user != null && !user.getHis1Rights().contains("RIGHT_CS_BIA_ANALYSIS_CREATE_ANALYSIS") && 
                !user.getHis1Rights().contains("RIGHT_CS_BIA_ANALYSIS_VIEW_ANALYSIS_TABLE") &&
                !user.getHis1Rights().contains("RIGHT_CS_BIA_ANALYSIS_VIEW_ANALYSIS_EMBEDDED") &&
                !user.getHis1Rights().contains("RIGHT_CS_BIA_ANALYSIS_EDIT_ANALYSIS_TABLE") ) {
            throw new AccessDeniedException("No right to access Create and View functions");
        }
    }

    public void checkDeleteRights() {
        SxUser user = (SxUser) userService.currentUserDetails();
        if ( user != null && !user.getHis1Rights().contains("RIGHT_CS_BIA_ANALYSIS_DELETE_ANALYSIS")) {
            throw new AccessDeniedException("No right to delete analysis");
        }
    }

    public List<Integer> getSachgebiete(Right... rights) {
        List<String> values = getRightParamValues(RightParam.TOPIC_AREA, rights);
        List<String> valuesForTopics = dbAdapter.getSachgebieteForFactTables(getRightParamValues(RightParam.TOPIC, rights));
        values.addAll(valuesForTopics);
        if (values.isEmpty()) {
           return new ArrayList<>();
        }
        List<Integer> sachgebietValues = values.stream()
                .map(Integer::parseInt).collect(Collectors.toList());
        return sachgebietValues;
    }

    public List<Identifier> getFactTables(Right... rights) {
        List<String> values = getRightParamValues(RightParam.TOPIC, rights);
        if (values.isEmpty()) {
           return new ArrayList<>();
        }
        List<Identifier> factsValues = values.stream()
                .map(value -> new Identifier(value)).collect(Collectors.toList());
        return factsValues;
    }

    public void checkSachgebiet(int sachgebiet, Right... rights) {
        List<Integer> sachgebiete = getSachgebiete(rights);
        if (sachgebiete.isEmpty()) {
           return; 
        } else if (!sachgebiete.contains(Integer.valueOf(sachgebiet))){
            throw new AccessDeniedException("No right to access Sachgebiet " + sachgebiet);
        }
    }

    public void checkFactTable(Identifier fact, Right... rights) {
        List<Identifier> factTables = getFactTables(rights);
        if (factTables.isEmpty()) {
           return; 
        } else if (!factTables.contains(fact)){
            throw new AccessDeniedException("No right to access Fact Table " + fact.composedId);
        }
    }

    /**
     * Return the values of a RightParam for a given array of Rights.
     * @param param RightParam which can be assigned to multiple Rights.
     * @param rights Rights which may or may not contain the RightParam.
     * @return List of values for the RightParam (first occurrence for multiple Rights).
     */
    public List<String> getRightParamValues(RightParam param, Right... rights) {
        SxUser user = (SxUser) userService.currentUserDetails();
        if(user == null) {
           return new ArrayList<>();
        }

        Map<String, Map<String,String>> rightsMap = user.getRightsMap();
        Map<String, String> rightParamMap = null;
        boolean noRights = true;
        for (Right right : rights) {
            if(rightsMap.containsKey(right.getString())) { 
                rightParamMap = rightsMap.get(right.getString());
                noRights = false;
                if(rightParamMap != null) {
                   break; 
                }
            }
        }
        
        if(noRights) {
            throw new AccessDeniedException("Missing rights: " + Right.getPrintableRights(rights));
        }

        if(rightParamMap == null || rightParamMap.isEmpty()) {
           return new ArrayList<>();
        }

        String paramValues = rightParamMap.get(param.getString());
        if (paramValues != null) {
            List<String> paramValuesResult = new ArrayList<>();
            for (String string : StringUtils.split(paramValues, ',')) {
               paramValuesResult.add(string);
            }
            return paramValuesResult;
        }
        return new ArrayList<>();
    }

}