/*
 *
 * Copyright 2015, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include "call.h"

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <php.h>
#include <php_ini.h>
#include <ext/standard/info.h>
#include <ext/spl/spl_exceptions.h>
#include "php_grpc.h"

#include <zend_exceptions.h>

#include <stdbool.h>

#include <grpc/grpc.h>
#include <grpc/grpc_security.h>
#include <grpc/slice.h>
#include <grpc/support/alloc.h>

#include "completion_queue.h"
#include "server.h"
#include "channel.h"
#include "server_credentials.h"
#include "timeval.h"

zend_class_entry *grpc_ce_server;
#if PHP_MAJOR_VERSION >= 7
static zend_object_handlers server_ce_handlers;
#endif

/* Frees and destroys an instance of wrapped_grpc_server */
PHP_GRPC_FREE_WRAPPED_FUNC_START(wrapped_grpc_server)
  if (p->wrapped != NULL) {
    grpc_server_shutdown_and_notify(p->wrapped, completion_queue, NULL);
    grpc_server_cancel_all_calls(p->wrapped);
    grpc_completion_queue_pluck(completion_queue, NULL,
                                gpr_inf_future(GPR_CLOCK_REALTIME), NULL);
    grpc_server_destroy(p->wrapped);
  }
PHP_GRPC_FREE_WRAPPED_FUNC_END()

/* Initializes an instance of wrapped_grpc_call to be associated with an
 * object of a class specified by class_type */
php_grpc_zend_object create_wrapped_grpc_server(zend_class_entry *class_type
                                                TSRMLS_DC) {
  PHP_GRPC_ALLOC_CLASS_OBJECT(wrapped_grpc_server);
  zend_object_std_init(&intern->std, class_type TSRMLS_CC);
  object_properties_init(&intern->std, class_type);
  PHP_GRPC_FREE_CLASS_OBJECT(wrapped_grpc_server, server_ce_handlers);
}

/**
 * Constructs a new instance of the Server class
 * @param array $args_array The arguments to pass to the server (optional)
 */
PHP_METHOD(Server, __construct) {
  wrapped_grpc_server *server = Z_WRAPPED_GRPC_SERVER_P(getThis());
  zval *args_array = NULL;
  grpc_channel_args args;

  /* "|a" == 1 optional array */
  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "|a", &args_array) ==
      FAILURE) {
    zend_throw_exception(spl_ce_InvalidArgumentException,
                         "Server expects an array",
                         1 TSRMLS_CC);
    return;
  }
  if (args_array == NULL) {
    server->wrapped = grpc_server_create(NULL, NULL);
  } else {
    //TODO(thinkerou): deal it if key of array is long, crash now on php7
    // and update unit test case
    php_grpc_read_args_array(args_array, &args TSRMLS_CC);
    server->wrapped = grpc_server_create(&args, NULL);
    efree(args.args);
  }
  grpc_server_register_completion_queue(server->wrapped, completion_queue,
                                        NULL);
}

/**
 * Request a call on a server. Creates a single GRPC_SERVER_RPC_NEW event.
 * @return void
 */
PHP_METHOD(Server, requestCall) {
  grpc_call_error error_code;
  grpc_call *call;
  grpc_call_details details;
  grpc_metadata_array metadata;
  grpc_event event;

  wrapped_grpc_server *server = Z_WRAPPED_GRPC_SERVER_P(getThis());
  zval *result;
  PHP_GRPC_MAKE_STD_ZVAL(result);
  object_init(result);

  grpc_call_details_init(&details);
  grpc_metadata_array_init(&metadata);
  error_code =
      grpc_server_request_call(server->wrapped, &call, &details, &metadata,
                               completion_queue, completion_queue, NULL);
  if (error_code != GRPC_CALL_OK) {
    zend_throw_exception(spl_ce_LogicException, "request_call failed",
                         (long)error_code TSRMLS_CC);
    goto cleanup;
  }
  event = grpc_completion_queue_pluck(completion_queue, NULL,
                                      gpr_inf_future(GPR_CLOCK_REALTIME),
                                      NULL);
  if (!event.success) {
    zend_throw_exception(spl_ce_LogicException,
                         "Failed to request a call for some reason",
                         1 TSRMLS_CC);
    goto cleanup;
  }
  char *method_text = grpc_slice_to_c_string(details.method);
  char *host_text = grpc_slice_to_c_string(details.host);
  php_grpc_add_property_string(result, "method", method_text, true);
  php_grpc_add_property_string(result, "host", host_text, true);
  gpr_free(method_text);
  gpr_free(host_text);
#if PHP_MAJOR_VERSION < 7
  add_property_zval(result, "call", grpc_php_wrap_call(call, true TSRMLS_CC));
  add_property_zval(result, "absolute_deadline",
                    grpc_php_wrap_timeval(details.deadline TSRMLS_CC));
  add_property_zval(result, "metadata", grpc_parse_metadata_array(&metadata
                                                                  TSRMLS_CC));
#else
  zval zv_call;
  zval zv_timeval;
  zval zv_md;
  //TODO(thinkerou): why use zval* to unit test error?
  zv_call = *grpc_php_wrap_call(call, true);
  zv_timeval = *grpc_php_wrap_timeval(details.deadline);
  zv_md = *grpc_parse_metadata_array(&metadata);

  add_property_zval(result, "call", &zv_call);
  add_property_zval(result, "absolute_deadline", &zv_timeval);
  add_property_zval(result, "metadata", &zv_md);
#endif

 cleanup:
  grpc_call_details_destroy(&details);
  grpc_metadata_array_destroy(&metadata);
  RETURN_DESTROY_ZVAL(result);
}

/**
 * Add a http2 over tcp listener.
 * @param string $addr The address to add
 * @return bool True on success, false on failure
 */
PHP_METHOD(Server, addHttp2Port) {
  const char *addr;
  php_grpc_int addr_len;
  wrapped_grpc_server *server = Z_WRAPPED_GRPC_SERVER_P(getThis());

  /* "s" == 1 string */
  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &addr, &addr_len)
      == FAILURE) {
    zend_throw_exception(spl_ce_InvalidArgumentException,
                         "add_http2_port expects a string", 1 TSRMLS_CC);
    return;
  }
  RETURN_LONG(grpc_server_add_insecure_http2_port(server->wrapped, addr));
}

/**
 * Add a secure http2 over tcp listener.
 * @param string $addr The address to add
 * @param ServerCredentials The ServerCredentials object
 * @return bool True on success, false on failure
 */
PHP_METHOD(Server, addSecureHttp2Port) {
  const char *addr;
  php_grpc_int addr_len;
  zval *creds_obj;
  wrapped_grpc_server *server = Z_WRAPPED_GRPC_SERVER_P(getThis());

  /* "sO" == 1 string, 1 object */
  if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "sO", &addr, &addr_len,
                            &creds_obj, grpc_ce_server_credentials) ==
      FAILURE) {
    zend_throw_exception(
        spl_ce_InvalidArgumentException,
        "add_http2_port expects a string and a ServerCredentials", 1 TSRMLS_CC);
    return;
  }
  wrapped_grpc_server_credentials *creds =
    Z_WRAPPED_GRPC_SERVER_CREDS_P(creds_obj);
  RETURN_LONG(grpc_server_add_secure_http2_port(server->wrapped, addr,
                                                creds->wrapped));
}

/**
 * Start a server - tells all listeners to start listening
 * @return void
 */
PHP_METHOD(Server, start) {
  wrapped_grpc_server *server = Z_WRAPPED_GRPC_SERVER_P(getThis());
  grpc_server_start(server->wrapped);
}

ZEND_BEGIN_ARG_INFO_EX(arginfo_construct, 0, 0, 0)
  ZEND_ARG_INFO(0, args)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_requestCall, 0, 0, 0)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_addHttp2Port, 0, 0, 1)
  ZEND_ARG_INFO(0, addr)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_addSecureHttp2Port, 0, 0, 2)
  ZEND_ARG_INFO(0, addr)
  ZEND_ARG_INFO(0, server_creds)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_start, 0, 0, 0)
ZEND_END_ARG_INFO()

static zend_function_entry server_methods[] = {
  PHP_ME(Server, __construct, arginfo_construct,
         ZEND_ACC_PUBLIC | ZEND_ACC_CTOR)
  PHP_ME(Server, requestCall, arginfo_requestCall,
         ZEND_ACC_PUBLIC)
  PHP_ME(Server, addHttp2Port, arginfo_addHttp2Port,
         ZEND_ACC_PUBLIC)
  PHP_ME(Server, addSecureHttp2Port, arginfo_addSecureHttp2Port,
         ZEND_ACC_PUBLIC)
  PHP_ME(Server, start, arginfo_start,
         ZEND_ACC_PUBLIC)
  PHP_FE_END
};

void grpc_init_server(TSRMLS_D) {
  zend_class_entry ce;
  INIT_CLASS_ENTRY(ce, "Grpc\\Server", server_methods);
  ce.create_object = create_wrapped_grpc_server;
  grpc_ce_server = zend_register_internal_class(&ce TSRMLS_CC);
  PHP_GRPC_INIT_HANDLER(wrapped_grpc_server, server_ce_handlers);
}
