/*
 * 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.net.URI;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.atomic.AtomicReference;

import javax.servlet.http.HttpServletRequest;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.DefaultValue;
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.QueryParam;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
import javax.ws.rs.core.UriInfo;

import org.joda.time.LocalDate;
import org.killbill.billing.ObjectType;
import org.killbill.billing.account.api.AccountApiException;
import org.killbill.billing.account.api.AccountUserApi;
import org.killbill.billing.catalog.api.BillingActionPolicy;
import org.killbill.billing.entitlement.api.EntitlementApi;
import org.killbill.billing.entitlement.api.EntitlementApiException;
import org.killbill.billing.entitlement.api.SubscriptionApi;
import org.killbill.billing.entitlement.api.SubscriptionApiException;
import org.killbill.billing.entitlement.api.SubscriptionBundle;
import org.killbill.billing.jaxrs.json.BundleJson;
import org.killbill.billing.jaxrs.json.CustomFieldJson;
import org.killbill.billing.jaxrs.json.TagJson;
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.util.api.AuditUserApi;
import org.killbill.billing.util.api.CustomFieldApiException;
import org.killbill.billing.util.api.CustomFieldUserApi;
import org.killbill.billing.util.api.TagApiException;
import org.killbill.billing.util.api.TagDefinitionApiException;
import org.killbill.billing.util.api.TagUserApi;
import org.killbill.billing.util.audit.AccountAuditLogs;
import org.killbill.billing.util.callcontext.CallContext;
import org.killbill.billing.util.callcontext.TenantContext;
import org.killbill.billing.util.entity.Pagination;
import org.killbill.clock.Clock;

import com.codahale.metrics.annotation.Timed;
import com.google.common.base.Function;
import com.google.common.collect.ImmutableMap;
import com.google.inject.Inject;
import com.wordnik.swagger.annotations.Api;
import com.wordnik.swagger.annotations.ApiOperation;
import com.wordnik.swagger.annotations.ApiResponse;
import com.wordnik.swagger.annotations.ApiResponses;

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

@Path(JaxrsResource.BUNDLES_PATH)
@Api(value = JaxrsResource.BUNDLES_PATH, description = "Operations on bundles")
public class BundleResource extends JaxRsResourceBase {

    private static final String ID_PARAM_NAME = "bundleId";

    private final SubscriptionApi subscriptionApi;
    private final EntitlementApi entitlementApi;

    @Inject
    public BundleResource(final JaxrsUriBuilder uriBuilder,
                          final TagUserApi tagUserApi,
                          final CustomFieldUserApi customFieldUserApi,
                          final AuditUserApi auditUserApi,
                          final AccountUserApi accountUserApi,
                          final SubscriptionApi subscriptionApi,
                          final EntitlementApi entitlementApi,
                          final PaymentApi paymentApi,
                          final Clock clock,
                          final Context context) {
        super(uriBuilder, tagUserApi, customFieldUserApi, auditUserApi, accountUserApi, paymentApi, clock, context);
        this.entitlementApi = entitlementApi;
        this.subscriptionApi = subscriptionApi;
    }

    @Timed
    @GET
    @Path("/{bundleId:" + UUID_PATTERN + "}")
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Retrieve a bundle by id", response = BundleJson.class)
    @ApiResponses(value = {@ApiResponse(code = 400, message = "Invalid bundle id supplied"),
                           @ApiResponse(code = 404, message = "Bundle not found")})
    public Response getBundle(@PathParam("bundleId") final String bundleId,
                              @javax.ws.rs.core.Context final HttpServletRequest request) throws SubscriptionApiException {
        final UUID id = UUID.fromString(bundleId);
        final SubscriptionBundle bundle = subscriptionApi.getSubscriptionBundle(id, context.createContext(request));
        final BundleJson json = new BundleJson(bundle, null);
        return Response.status(Status.OK).entity(json).build();
    }

    @Timed
    @GET
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Retrieve a bundle by external key", response = BundleJson.class)
    @ApiResponses(value = {@ApiResponse(code = 404, message = "Bundle not found")})
    public Response getBundleByKey(@QueryParam(QUERY_EXTERNAL_KEY) final String externalKey,
                                   @javax.ws.rs.core.Context final HttpServletRequest request) throws SubscriptionApiException {
        final SubscriptionBundle bundle = subscriptionApi.getActiveSubscriptionBundleForExternalKey(externalKey, context.createContext(request));
        final BundleJson json = new BundleJson(bundle, null);
        return Response.status(Status.OK).entity(json).build();
    }

    @Timed
    @GET
    @Path("/" + PAGINATION)
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "List bundles", response = BundleJson.class, responseContainer = "List")
    @ApiResponses(value = {})
    public Response getBundles(@QueryParam(QUERY_SEARCH_OFFSET) @DefaultValue("0") final Long offset,
                               @QueryParam(QUERY_SEARCH_LIMIT) @DefaultValue("100") final Long limit,
                               @QueryParam(QUERY_AUDIT) @DefaultValue("NONE") final AuditMode auditMode,
                               @javax.ws.rs.core.Context final HttpServletRequest request) throws SubscriptionApiException {
        final TenantContext tenantContext = context.createContext(request);
        final Pagination<SubscriptionBundle> bundles = subscriptionApi.getSubscriptionBundles(offset, limit, tenantContext);
        final URI nextPageUri = uriBuilder.nextPage(BundleResource.class, "getBundles", bundles.getNextOffset(), limit, ImmutableMap.<String, String>of(QUERY_AUDIT, auditMode.getLevel().toString()));
        final AtomicReference<Map<UUID, AccountAuditLogs>> accountsAuditLogs = new AtomicReference<Map<UUID, AccountAuditLogs>>(new HashMap<UUID, AccountAuditLogs>());
        return buildStreamingPaginationResponse(bundles,
                                                new Function<SubscriptionBundle, BundleJson>() {
                                                    @Override
                                                    public BundleJson apply(final SubscriptionBundle bundle) {
                                                        // Cache audit logs per account
                                                        if (accountsAuditLogs.get().get(bundle.getAccountId()) == null) {
                                                            accountsAuditLogs.get().put(bundle.getAccountId(), auditUserApi.getAccountAuditLogs(bundle.getAccountId(), auditMode.getLevel(), tenantContext));
                                                        }
                                                        return new BundleJson(bundle, accountsAuditLogs.get().get(bundle.getAccountId()));
                                                    }
                                                },
                                                nextPageUri);
    }

    @Timed
    @GET
    @Path("/" + SEARCH + "/{searchKey:" + ANYTHING_PATTERN + "}")
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Search bundles", response = BundleJson.class, responseContainer = "List")
    @ApiResponses(value = {})
    public Response searchBundles(@PathParam("searchKey") final String searchKey,
                                  @QueryParam(QUERY_SEARCH_OFFSET) @DefaultValue("0") final Long offset,
                                  @QueryParam(QUERY_SEARCH_LIMIT) @DefaultValue("100") final Long limit,
                                  @QueryParam(QUERY_AUDIT) @DefaultValue("NONE") final AuditMode auditMode,
                                  @javax.ws.rs.core.Context final HttpServletRequest request) throws SubscriptionApiException {
        final TenantContext tenantContext = context.createContext(request);
        final Pagination<SubscriptionBundle> bundles = subscriptionApi.searchSubscriptionBundles(searchKey, offset, limit, tenantContext);
        final URI nextPageUri = uriBuilder.nextPage(BundleResource.class, "searchBundles", bundles.getNextOffset(), limit, ImmutableMap.<String, String>of("searchKey", searchKey,
                                                                                                                                                           QUERY_AUDIT, auditMode.getLevel().toString()));
        final AtomicReference<Map<UUID, AccountAuditLogs>> accountsAuditLogs = new AtomicReference<Map<UUID, AccountAuditLogs>>(new HashMap<UUID, AccountAuditLogs>());
        return buildStreamingPaginationResponse(bundles,
                                                new Function<SubscriptionBundle, BundleJson>() {
                                                    @Override
                                                    public BundleJson apply(final SubscriptionBundle bundle) {
                                                        // Cache audit logs per account
                                                        if (accountsAuditLogs.get().get(bundle.getAccountId()) == null) {
                                                            accountsAuditLogs.get().put(bundle.getAccountId(), auditUserApi.getAccountAuditLogs(bundle.getAccountId(), auditMode.getLevel(), tenantContext));
                                                        }
                                                        return new BundleJson(bundle, accountsAuditLogs.get().get(bundle.getAccountId()));
                                                    }
                                                },
                                                nextPageUri);
    }

    @Timed
    @PUT
    @Path("/{bundleId:" + UUID_PATTERN + "}/" + PAUSE)
    @Consumes(APPLICATION_JSON)
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Pause a bundle")
    @ApiResponses(value = {@ApiResponse(code = 400, message = "Invalid bundle id supplied"),
                           @ApiResponse(code = 404, message = "Bundle not found")})
    public Response pauseBundle(@PathParam(ID_PARAM_NAME) final String id,
                                @QueryParam(QUERY_REQUESTED_DT) final String requestedDate,
                                @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) throws SubscriptionApiException, EntitlementApiException, AccountApiException {

        final CallContext callContext = context.createContext(createdBy, reason, comment, request);
        final UUID bundleId = UUID.fromString(id);
        final SubscriptionBundle bundle = subscriptionApi.getSubscriptionBundle(bundleId, callContext);
        final LocalDate inputLocalDate = toLocalDate(bundle.getAccountId(), requestedDate, callContext);
        entitlementApi.pause(bundleId, inputLocalDate, callContext);
        return Response.status(Status.OK).build();
    }

    @Timed
    @PUT
    @Path("/{bundleId:" + UUID_PATTERN + "}/" + RESUME)
    @Consumes(APPLICATION_JSON)
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Resume a bundle")
    @ApiResponses(value = {@ApiResponse(code = 400, message = "Invalid bundle id supplied"),
                           @ApiResponse(code = 404, message = "Bundle not found")})
    public Response resumeBundle(@PathParam(ID_PARAM_NAME) final String id,
                                 @QueryParam(QUERY_REQUESTED_DT) final String requestedDate,
                                 @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) throws SubscriptionApiException, EntitlementApiException, AccountApiException {

        final CallContext callContext = context.createContext(createdBy, reason, comment, request);
        final UUID bundleId = UUID.fromString(id);
        final SubscriptionBundle bundle = subscriptionApi.getSubscriptionBundle(bundleId, callContext);
        final LocalDate inputLocalDate = toLocalDate(bundle.getAccountId(), requestedDate, callContext);
        entitlementApi.resume(bundleId, inputLocalDate, callContext);
        return Response.status(Status.OK).build();
    }

    @Timed
    @GET
    @Path("/{bundleId:" + UUID_PATTERN + "}/" + CUSTOM_FIELDS)
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Retrieve bundle custom fields", response = CustomFieldJson.class, responseContainer = "List")
    @ApiResponses(value = {@ApiResponse(code = 400, message = "Invalid bundle id supplied")})
    public Response getCustomFields(@PathParam(ID_PARAM_NAME) final String id,
                                    @QueryParam(QUERY_AUDIT) @DefaultValue("NONE") final AuditMode auditMode,
                                    @javax.ws.rs.core.Context final HttpServletRequest request) {
        return super.getCustomFields(UUID.fromString(id), auditMode, context.createContext(request));
    }

    @Timed
    @POST
    @Path("/{bundleId:" + UUID_PATTERN + "}/" + CUSTOM_FIELDS)
    @Consumes(APPLICATION_JSON)
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Add custom fields to bundle")
    @ApiResponses(value = {@ApiResponse(code = 400, message = "Invalid bundle id supplied")})
    public Response createCustomFields(@PathParam(ID_PARAM_NAME) final String id,
                                       final List<CustomFieldJson> customFields,
                                       @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 CustomFieldApiException {
        return super.createCustomFields(UUID.fromString(id), customFields,
                                        context.createContext(createdBy, reason, comment, request), uriInfo);
    }

    @Timed
    @DELETE
    @Path("/{bundleId:" + UUID_PATTERN + "}/" + CUSTOM_FIELDS)
    @Consumes(APPLICATION_JSON)
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Remove custom fields from bundle")
    @ApiResponses(value = {@ApiResponse(code = 400, message = "Invalid bundle id supplied")})
    public Response deleteCustomFields(@PathParam(ID_PARAM_NAME) final String id,
                                       @QueryParam(QUERY_CUSTOM_FIELDS) final String customFieldList,
                                       @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) throws CustomFieldApiException {
        return super.deleteCustomFields(UUID.fromString(id), customFieldList,
                                        context.createContext(createdBy, reason, comment, request));
    }

    @Timed
    @GET
    @Path("/{bundleId:" + UUID_PATTERN + "}/" + TAGS)
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Retrieve bundle tags", response = TagJson.class, responseContainer = "List")
    @ApiResponses(value = {@ApiResponse(code = 400, message = "Invalid bundle id supplied"),
                           @ApiResponse(code = 404, message = "Bundle not found")})
    public Response getTags(@PathParam(ID_PARAM_NAME) final String bundleIdString,
                            @QueryParam(QUERY_AUDIT) @DefaultValue("NONE") final AuditMode auditMode,
                            @QueryParam(QUERY_TAGS_INCLUDED_DELETED) @DefaultValue("false") final Boolean includedDeleted,
                            @javax.ws.rs.core.Context final HttpServletRequest request) throws TagDefinitionApiException, SubscriptionApiException {
        final UUID bundleId = UUID.fromString(bundleIdString);
        final TenantContext tenantContext = context.createContext(request);
        final SubscriptionBundle bundle = subscriptionApi.getSubscriptionBundle(bundleId, context.createContext(request));
        return super.getTags(bundle.getAccountId(), bundleId, auditMode, includedDeleted, tenantContext);
    }

    @Timed
    @PUT
    @Path("/{bundleId:" + UUID_PATTERN + "}")
    @Consumes(APPLICATION_JSON)
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Transfer a bundle to another account")
    @ApiResponses(value = {@ApiResponse(code = 400, message = "Invalid bundle id, requested date or policy supplied"),
                           @ApiResponse(code = 404, message = "Bundle not found")})
    public Response transferBundle(final BundleJson json,
                                   @PathParam(ID_PARAM_NAME) final String id,
                                   @QueryParam(QUERY_REQUESTED_DT) final String requestedDate,
                                   @QueryParam(QUERY_BILLING_POLICY) @DefaultValue("END_OF_TERM") final String policyString,
                                   @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 UriInfo uriInfo,
                                   @javax.ws.rs.core.Context final HttpServletRequest request) throws EntitlementApiException, SubscriptionApiException, AccountApiException {
        verifyNonNullOrEmpty(json, "BundleJson body should be specified");
        verifyNonNullOrEmpty(json.getAccountId(), "BundleJson accountId needs to be set");

        final BillingActionPolicy policy = BillingActionPolicy.valueOf(policyString.toUpperCase());

        final CallContext callContext = context.createContext(createdBy, reason, comment, request);
        final UUID bundleId = UUID.fromString(id);

        final SubscriptionBundle bundle = subscriptionApi.getSubscriptionBundle(bundleId, callContext);
        final LocalDate inputLocalDate = toLocalDate(bundle.getAccountId(), requestedDate, callContext);

        final UUID newBundleId = entitlementApi.transferEntitlementsOverrideBillingPolicy(bundle.getAccountId(), UUID.fromString(json.getAccountId()), bundle.getExternalKey(), inputLocalDate, policy, callContext);
        return uriBuilder.buildResponse(BundleResource.class, "getBundle", newBundleId, uriInfo.getBaseUri().toString());
    }

    @Timed
    @POST
    @Path("/{bundleId:" + UUID_PATTERN + "}/" + TAGS)
    @Consumes(APPLICATION_JSON)
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Add tags to bundle")
    @ApiResponses(value = {@ApiResponse(code = 400, message = "Invalid bundle id supplied")})
    public Response createTags(@PathParam(ID_PARAM_NAME) final String id,
                               @QueryParam(QUERY_TAGS) final String tagList,
                               @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 UriInfo uriInfo,
                               @javax.ws.rs.core.Context final HttpServletRequest request) throws TagApiException {
        return super.createTags(UUID.fromString(id), tagList, uriInfo,
                                context.createContext(createdBy, reason, comment, request));
    }

    @Timed
    @DELETE
    @Path("/{bundleId:" + UUID_PATTERN + "}/" + TAGS)
    @Consumes(APPLICATION_JSON)
    @Produces(APPLICATION_JSON)
    @ApiOperation(value = "Remove tags from bundle")
    @ApiResponses(value = {@ApiResponse(code = 400, message = "Invalid bundle id supplied")})
    public Response deleteTags(@PathParam(ID_PARAM_NAME) final String id,
                               @QueryParam(QUERY_TAGS) final String tagList,
                               @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) throws TagApiException {
        return super.deleteTags(UUID.fromString(id), tagList,
                                context.createContext(createdBy, reason, comment, request));
    }

    @Override
    protected ObjectType getObjectType() {
        return ObjectType.BUNDLE;
    }
}
