/*
 * Copyright 2010-2013 Ning, Inc.
 *
 * Ning licenses this file to you under the Apache License, version 2.0
 * (the "License"); you may not use this file except in compliance with the
 * License.  You may obtain a copy of the License at:
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package org.killbill.billing.jaxrs.resources;

import java.util.List;
import java.util.Set;

import javax.inject.Singleton;
import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.POST;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
import javax.ws.rs.core.UriInfo;

import org.apache.shiro.SecurityUtils;
import org.apache.shiro.subject.Subject;
import org.killbill.billing.account.api.AccountUserApi;
import org.killbill.billing.jaxrs.json.RoleDefinitionJson;
import org.killbill.billing.jaxrs.json.SubjectJson;
import org.killbill.billing.jaxrs.json.UserRolesJson;
import org.killbill.billing.jaxrs.util.Context;
import org.killbill.billing.jaxrs.util.JaxrsUriBuilder;
import org.killbill.billing.payment.api.PaymentApi;
import org.killbill.billing.security.Permission;
import org.killbill.billing.security.SecurityApiException;
import org.killbill.billing.security.api.SecurityApi;
import org.killbill.billing.util.api.AuditUserApi;
import org.killbill.billing.util.api.CustomFieldUserApi;
import org.killbill.billing.util.api.TagUserApi;
import org.killbill.billing.util.callcontext.TenantContext;
import org.killbill.clock.Clock;
import org.killbill.commons.metrics.TimedResource;

import com.google.common.base.Functions;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.inject.Inject;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiResponse;
import io.swagger.annotations.ApiResponses;

import static javax.ws.rs.core.MediaType.APPLICATION_JSON;

@Singleton
@Path(JaxrsResource.SECURITY_PATH)
@Api(value = JaxrsResource.SECURITY_PATH, description = "Information about RBAC", tags="Security")
public class SecurityResource extends JaxRsResourceBase {

    private final SecurityApi securityApi;

    @Inject
    public SecurityResource(final SecurityApi securityApi,
                            final JaxrsUriBuilder uriBuilder,
                            final TagUserApi tagUserApi,
                            final CustomFieldUserApi customFieldUserApi,
                            final AuditUserApi auditUserApi,
                            final AccountUserApi accountUserApi,
                            final PaymentApi paymentApi,
                            final Clock clock,
                            final Context context) {
        super(uriBuilder, tagUserApi, customFieldUserApi, auditUserApi, accountUserApi, paymentApi, null, clock, context);
        this.securityApi = securityApi;
    }

    @TimedResource
    @GET
    @Path("/permissions")
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "List user permissions", response = String.class, responseContainer = "List")
    @ApiResponses(value = {})
    public Response getCurrentUserPermissions(@javax.ws.rs.core.Context final HttpServletRequest request) {
        // The getCurrentUserPermissions takes a TenantContext which is not used because permissions are cross tenants (at this point)
        final TenantContext nullTenantContext = null;
        final Set<Permission> permissions = securityApi.getCurrentUserPermissions(nullTenantContext);
        final List<String> json = ImmutableList.<String>copyOf(Iterables.<Permission, String>transform(permissions, Functions.toStringFunction()));
        return Response.status(Status.OK).entity(json).build();
    }

    @TimedResource
    @GET
    @Path("/subject")
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Get user information", response = SubjectJson.class)
    @ApiResponses(value = {})
    public Response getCurrentUserSubject(@javax.ws.rs.core.Context final HttpServletRequest request) {
        final Subject subject = SecurityUtils.getSubject();
        final SubjectJson subjectJson = new SubjectJson(subject);
        return Response.status(Status.OK).entity(subjectJson).build();
    }

    @TimedResource
    @POST
    @Path("/users")
    @Consumes(APPLICATION_JSON)
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Add a new user with roles (to make api requests)", response = UserRolesJson.class)
    @ApiResponses(value = {@ApiResponse(code = 201, message = "User role created successfully")})
    public Response addUserRoles(final UserRolesJson json,
                                 @HeaderParam(HDR_CREATED_BY) final String createdBy,
                                 @HeaderParam(HDR_REASON) final String reason,
                                 @HeaderParam(HDR_COMMENT) final String comment,
                                 @javax.ws.rs.core.Context final HttpServletRequest request,
                                 @javax.ws.rs.core.Context final UriInfo uriInfo) throws SecurityApiException {
        securityApi.addUserRoles(json.getUsername(), json.getPassword(), json.getRoles(), context.createCallContextNoAccountId(createdBy, reason, comment, request));
        return uriBuilder.buildResponse(uriInfo, SecurityResource.class, "getUserRoles", json.getUsername(), request);
    }

    @TimedResource
    @PUT
    @Consumes(APPLICATION_JSON)
    @Produces(APPLICATION_JSON)
    @Path("/users/{username:" + ANYTHING_PATTERN + "}/password")
    @ApiOperation(value = "Update a user password")
    @ApiResponses(value = {@ApiResponse(code = 204, message = "Successful operation")})
    public Response updateUserPassword(@PathParam("username") final String username,
                                       final UserRolesJson json,
                                       @HeaderParam(HDR_CREATED_BY) final String createdBy,
                                       @HeaderParam(HDR_REASON) final String reason,
                                       @HeaderParam(HDR_COMMENT) final String comment,
                                       @javax.ws.rs.core.Context final HttpServletRequest request,
                                       @javax.ws.rs.core.Context final UriInfo uriInfo) throws SecurityApiException {
        securityApi.updateUserPassword(username, json.getPassword(), context.createCallContextNoAccountId(createdBy, reason, comment, request));
        return Response.status(Status.NO_CONTENT).build();
    }

    @TimedResource
    @GET
    @Produces(APPLICATION_JSON)
    @Path("/users/{username:" + ANYTHING_PATTERN + "}/roles")
    @ApiOperation(value = "Get roles associated to a user", response = UserRolesJson.class)
    public Response getUserRoles(@PathParam("username") final String username,
                                 @javax.ws.rs.core.Context final HttpServletRequest request,
                                 @javax.ws.rs.core.Context final UriInfo uriInfo) throws SecurityApiException {
        final List<String> roles = securityApi.getUserRoles(username, context.createTenantContextNoAccountId(request));
        final UserRolesJson userRolesJson = new UserRolesJson(username, null, roles);
        return Response.status(Status.OK).entity(userRolesJson).build();
    }

    @TimedResource
    @PUT
    @Consumes(APPLICATION_JSON)
    @Produces(APPLICATION_JSON)
    @Path("/users/{username:" + ANYTHING_PATTERN + "}/roles")
    @ApiOperation(value = "Update roles associated to a user")
    @ApiResponses(value = {@ApiResponse(code = 204, message = "Successful operation")})
     public Response updateUserRoles(@PathParam("username") final String username,
                                    final UserRolesJson json,
                                    @HeaderParam(HDR_CREATED_BY) final String createdBy,
                                    @HeaderParam(HDR_REASON) final String reason,
                                    @HeaderParam(HDR_COMMENT) final String comment,
                                    @javax.ws.rs.core.Context final HttpServletRequest request,
                                    @javax.ws.rs.core.Context final UriInfo uriInfo) throws SecurityApiException {
        securityApi.updateUserRoles(username, json.getRoles(), context.createCallContextNoAccountId(createdBy, reason, comment, request));
        return Response.status(Status.NO_CONTENT).build();
    }

    @TimedResource
    @DELETE
    @Consumes(APPLICATION_JSON)
    @Produces(APPLICATION_JSON)
    @Path("/users/{username:" + ANYTHING_PATTERN + "}")
    @ApiOperation(value = "Invalidate an existing user")
    @ApiResponses(value = {@ApiResponse(code = 204, message = "Successful operation")})
    public Response invalidateUser(@PathParam("username") final String username,
                                   @HeaderParam(HDR_CREATED_BY) final String createdBy,
                                   @HeaderParam(HDR_REASON) final String reason,
                                   @HeaderParam(HDR_COMMENT) final String comment,
                                   @javax.ws.rs.core.Context final HttpServletRequest request,
                                   @javax.ws.rs.core.Context final UriInfo uriInfo) throws SecurityApiException {
        securityApi.invalidateUser(username, context.createCallContextNoAccountId(createdBy, reason, comment, request));
        return Response.status(Status.NO_CONTENT).build();
    }


    @TimedResource
    @GET
    @Produces(APPLICATION_JSON)
    @Path("/roles/{role:" + ANYTHING_PATTERN + "}")
    @ApiOperation(value = "Get role definition", response = RoleDefinitionJson.class)
    public Response getRoleDefinition(@PathParam("role") final String role,
                                 @javax.ws.rs.core.Context final HttpServletRequest request,
                                 @javax.ws.rs.core.Context final UriInfo uriInfo) throws SecurityApiException {
        final List<String> roleDefinitions =  securityApi.getRoleDefinition(role, context.createTenantContextNoAccountId(request));
        final RoleDefinitionJson result =  new RoleDefinitionJson(role, roleDefinitions);
        return Response.status(Status.OK).entity(result).build();
    }


    @TimedResource
    @POST
    @Path("/roles")
    @Consumes(APPLICATION_JSON)
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Add a new role definition)", response = RoleDefinitionJson.class)
    @ApiResponses(value = {@ApiResponse(code = 201, message = "Role definition created successfully")})
    public Response addRoleDefinition(final RoleDefinitionJson json,
                                      @HeaderParam(HDR_CREATED_BY) final String createdBy,
                                      @HeaderParam(HDR_REASON) final String reason,
                                      @HeaderParam(HDR_COMMENT) final String comment,
                                      @javax.ws.rs.core.Context final HttpServletRequest request,
                                      @javax.ws.rs.core.Context final UriInfo uriInfo) throws SecurityApiException {
        securityApi.addRoleDefinition(json.getRole(), json.getPermissions(), context.createCallContextNoAccountId(createdBy, reason, comment, request));
        return uriBuilder.buildResponse(uriInfo, SecurityResource.class, "getRoleDefinition", json.getRole(), request);
    }


    @TimedResource
    @PUT
    @Consumes(APPLICATION_JSON)
    @Produces(APPLICATION_JSON)
    @Path("/roles")
    @ApiOperation(value = "Update a new role definition)")
    @ApiResponses(value = {@ApiResponse(code = 204, message = "Successful operation")})
    public Response updateRoleDefinition(final RoleDefinitionJson json,
                                    @HeaderParam(HDR_CREATED_BY) final String createdBy,
                                    @HeaderParam(HDR_REASON) final String reason,
                                    @HeaderParam(HDR_COMMENT) final String comment,
                                    @javax.ws.rs.core.Context final HttpServletRequest request,
                                    @javax.ws.rs.core.Context final UriInfo uriInfo) throws SecurityApiException {
        securityApi.updateRoleDefinition(json.getRole(), json.getPermissions(), context.createCallContextNoAccountId(createdBy, reason, comment, request));
        return Response.status(Status.NO_CONTENT).build();
    }

}
