/**
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/.
 */
package org.mifosplatform.infrastructure.security.api;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Set;

import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.core.MediaType;

import org.mifosplatform.infrastructure.core.data.EnumOptionData;
import org.mifosplatform.infrastructure.core.serialization.ToApiJsonSerializer;
import org.mifosplatform.infrastructure.security.data.AuthenticatedUserData;
import org.mifosplatform.infrastructure.security.service.SpringSecurityPlatformSecurityContext;
import org.mifosplatform.useradministration.data.RoleData;
import org.mifosplatform.useradministration.domain.AppUser;
import org.mifosplatform.useradministration.domain.Role;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Profile;
import org.springframework.context.annotation.Scope;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.stereotype.Component;

import com.sun.jersey.core.util.Base64;

@Path("/authentication")
@Component
@Profile("basicauth")
@Scope("singleton")
public class AuthenticationApiResource {

    private final DaoAuthenticationProvider customAuthenticationProvider;
    private final ToApiJsonSerializer<AuthenticatedUserData> apiJsonSerializerService;
    private final SpringSecurityPlatformSecurityContext springSecurityPlatformSecurityContext;

    @Autowired
    public AuthenticationApiResource(
            @Qualifier("customAuthenticationProvider") final DaoAuthenticationProvider customAuthenticationProvider,
            final ToApiJsonSerializer<AuthenticatedUserData> apiJsonSerializerService,
            final SpringSecurityPlatformSecurityContext springSecurityPlatformSecurityContext) {
        this.customAuthenticationProvider = customAuthenticationProvider;
        this.apiJsonSerializerService = apiJsonSerializerService;
        this.springSecurityPlatformSecurityContext = springSecurityPlatformSecurityContext;
    }

    @POST
    @Produces({ MediaType.APPLICATION_JSON })
    public String authenticate(@QueryParam("username") final String username, @QueryParam("password") final String password) {

        final Authentication authentication = new UsernamePasswordAuthenticationToken(username, password);
        final Authentication authenticationCheck = this.customAuthenticationProvider.authenticate(authentication);

        final Collection<String> permissions = new ArrayList<>();
        AuthenticatedUserData authenticatedUserData = new AuthenticatedUserData(username, permissions);

        if (authenticationCheck.isAuthenticated()) {
            final Collection<GrantedAuthority> authorities = new ArrayList<>(authenticationCheck.getAuthorities());
            for (final GrantedAuthority grantedAuthority : authorities) {
                permissions.add(grantedAuthority.getAuthority());
            }

            final byte[] base64EncodedAuthenticationKey = Base64.encode(username + ":" + password);

            final AppUser principal = (AppUser) authenticationCheck.getPrincipal();
            final Collection<RoleData> roles = new ArrayList<>();
            final Set<Role> userRoles = principal.getRoles();
            for (final Role role : userRoles) {
                roles.add(role.toData());
            }

            final Long officeId = principal.getOffice().getId();
            final String officeName = principal.getOffice().getName();

            final Long staffId = principal.getStaffId();
            final String staffDisplayName = principal.getStaffDisplayName();

            final EnumOptionData organisationalRole = principal.organisationalRoleData();

            if (this.springSecurityPlatformSecurityContext.doesPasswordHasToBeRenewed(principal)) {
                authenticatedUserData = new AuthenticatedUserData(username, principal.getId(), new String(base64EncodedAuthenticationKey));
            } else {

                authenticatedUserData = new AuthenticatedUserData(username, officeId, officeName, staffId, staffDisplayName,
                        organisationalRole, roles, permissions, principal.getId(), new String(base64EncodedAuthenticationKey));
            }

        }

        return this.apiJsonSerializerService.serialize(authenticatedUserData);
    }
}