package eu.dnetlib.dnetrolemanagement.controllers;

import com.google.gson.Gson;
import com.google.gson.JsonArray;
import eu.dnetlib.dnetrolemanagement.dto.Response;
import eu.dnetlib.dnetrolemanagement.dto.User;
import eu.dnetlib.dnetrolemanagement.exception.ResourceNotFoundException;
import eu.dnetlib.dnetrolemanagement.exception.UnprocessableException;
import eu.dnetlib.dnetrolemanagement.services.RegistryService;
import eu.dnetlib.dnetrolemanagement.utils.AuthoritiesUpdater;
import eu.dnetlib.dnetrolemanagement.utils.AuthoritiesUtils;
import eu.dnetlib.dnetrolemanagement.utils.JsonUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.web.bind.annotation.*;

import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.stream.Collectors;

@RestController
@RequestMapping("/member")
public class MemberController {

    private final RegistryService registryService;
    private final AuthoritiesUpdater authoritiesUpdater;
    private final Gson gson;

    @Autowired
    public MemberController(RegistryService registryService, AuthoritiesUpdater authoritiesUpdater) {
        this.registryService = registryService;
        this.authoritiesUpdater = authoritiesUpdater;
        this.gson = new Gson();
    }


    /**
     * Get the user info of the members of a type(Community, etc.) with id(ee, egi, etc.)
     */
    @RequestMapping(value = "/{type}/{id}", method = RequestMethod.GET)
    public ResponseEntity<User[]> getInfos(@PathVariable("type") String type, @PathVariable("id") String id) {
        Integer couId = registryService.getCouId(type, id);
        if (couId != null) {
            JsonArray users = registryService.getUserIdByCouId(couId, false);
            JsonArray emails = registryService.getUserEmailByCouId(couId, false);
            JsonArray names = registryService.getUserNamesByCouId(couId, false);
            return ResponseEntity.ok(JsonUtils.mergeUserInfo(users, emails, names, gson));
        }
        throw new ResourceNotFoundException("Role has not been found");
    }

    /**
     * Assign member role to logged in user or user with @email
     */
    @RequestMapping(value = "/{type}/{id}", method = RequestMethod.POST)
    public ResponseEntity<Response> assignRole(@PathVariable("type") String type, @PathVariable("id") String id, @RequestParam(required = false) String email) {
        List<Integer> coPersonIds = registryService.getCoPersonIdsByEmail(email);
        if (coPersonIds.size() > 0) {
            Integer couId = registryService.getCouId(type, id);
            if (couId != null) {
                coPersonIds.forEach(coPersonId -> {
                    String identifier = registryService.getIdentifierByCoPersonId(coPersonId);
                    Integer role = registryService.getRoleId(coPersonId, couId);
                    registryService.assignMemberRole(coPersonId, couId, role);
                    authoritiesUpdater.update(identifier, old -> {
                        HashSet<SimpleGrantedAuthority> authorities = new HashSet<>((Collection<? extends SimpleGrantedAuthority>) old);
                        authorities.add(new SimpleGrantedAuthority(AuthoritiesUtils.member(type, id)));
                        return authorities;
                    });
                });
                return ResponseEntity.ok(new Response("Role has been assigned successfully"));
            }
            throw new ResourceNotFoundException("Role has not been found");
        }
        throw new ResourceNotFoundException("User has not been found");
    }

    /**
     * Remove member role from logged in user or user with @email
     */
    @RequestMapping(value = "/{type}/{id}", method = RequestMethod.DELETE)
    public ResponseEntity<Response> removeRole(@PathVariable("type") String type, @PathVariable("id") String id, @RequestParam(required = false) String email) {
        List<Integer> coPersonIds = registryService.getCoPersonIdsByEmail(email);
        if (coPersonIds.size() > 0) {
            Integer couId = registryService.getCouId(type, id);
            if (couId != null) {
                // If none of the accounts has admin role for this group remove member role
                if (coPersonIds.stream().filter(coPersonId -> registryService.getUserAdminGroup(coPersonId, couId) != null).collect(Collectors.toList()).size() == 0) {
                    coPersonIds.forEach(coPersonId -> {
                        String identifier = registryService.getIdentifierByCoPersonId(coPersonId);
                        Integer role = registryService.getRoleId(coPersonId, couId);
                        registryService.removeMemberRole(coPersonId, couId, role);
                        authoritiesUpdater.update(identifier, old -> {
                            HashSet<SimpleGrantedAuthority> authorities = new HashSet<>((Collection<? extends SimpleGrantedAuthority>) old);
                            authorities.remove(new SimpleGrantedAuthority(AuthoritiesUtils.member(type, id)));
                            return authorities;
                        });
                    });
                    return ResponseEntity.ok(new Response("Role has been revoked successfully"));
                }
                throw new UnprocessableException("User is admin of this group, so you must remove admin role first instead of member role");
            }
            throw new ResourceNotFoundException("Role has not been found");
        }
        throw new ResourceNotFoundException("User has not been found");
    }


    /**
     * Get the names of the members of a type(Community, etc.) with id(ee, egi, etc.)
     */
    @RequestMapping(value = "/{type}/{id}/name", method = RequestMethod.GET)
    public ResponseEntity<User[]> getNames(@PathVariable("type") String type, @PathVariable("id") String id) {
        Integer couId = registryService.getCouId(type, id);
        if (couId != null) {
            JsonArray users = registryService.getUserNamesByCouId(couId, false);
            return ResponseEntity.ok(gson.fromJson(users, User[].class));
        }
        throw new ResourceNotFoundException("Role has not been found");
    }

    /**
     * Get the Identifiers of the members of a type(Community, etc.) with id(ee, egi, etc.)
     */
    @RequestMapping(value = "/{type}/{id}/id", method = RequestMethod.GET)
    public ResponseEntity<User[]> getIds(@PathVariable("type") String type, @PathVariable("id") String id) {
        Integer couId = registryService.getCouId(type, id);
        if (couId != null) {
            JsonArray users = registryService.getUserIdByCouId(couId, false);
            return ResponseEntity.ok(gson.fromJson(users, User[].class));
        }
        throw new ResourceNotFoundException("Role has not been found");
    }

    /**
     * Get the emails of the members of a type(Community, etc.) with id(ee, egi, etc.)
     */
    @RequestMapping(value = "/{type}/{id}/email", method = RequestMethod.GET)
    public ResponseEntity<User[]> getEmails(@PathVariable("type") String type, @PathVariable("id") String id) {
        Integer couId = registryService.getCouId(type, id);
        if (couId != null) {
            JsonArray users = registryService.getUserEmailByCouId(couId, false);
            return ResponseEntity.ok(gson.fromJson(users, User[].class));
        }
        throw new ResourceNotFoundException("Role has not been found");
    }
}