/*
*
* Copyright 2018 gRPC authors.
*
* Licensed 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.
*
*/

#import "ChannelArgsUtil.h"

#include <grpc/support/alloc.h>
#include <grpc/support/string_util.h>

#include <limits.h>

static void *copy_pointer_arg(void *p) {
// Add ref count to the object when making copy
id obj = (__bridge id)p;
return (__bridge_retained void *)obj;
}

static void destroy_pointer_arg(void *p) {
// Decrease ref count to the object when destroying
CFRelease((CFTypeRef)p);
}

static int cmp_pointer_arg(void *p, void *q) { return p == q; }

static const grpc_arg_pointer_vtable objc_arg_vtable = {copy_pointer_arg, destroy_pointer_arg,
cmp_pointer_arg};

void GRPCFreeChannelArgs(grpc_channel_args *channel_args) {
for (size_t i = 0; i < channel_args->num_args; ++i) {
grpc_arg *arg = &channel_args->args[i];
gpr_free(arg->key);
if (arg->type == GRPC_ARG_STRING) {
gpr_free(arg->value.string);
}
}
gpr_free(channel_args->args);
gpr_free(channel_args);
}

grpc_channel_args *GRPCBuildChannelArgs(NSDictionary *dictionary) {
if (dictionary.count == 0) {
return NULL;
}

NSArray *keys = [dictionary allKeys];
NSUInteger argCount = [keys count];

grpc_channel_args *channelArgs = gpr_malloc(sizeof(grpc_channel_args));
channelArgs->args = gpr_malloc(argCount * sizeof(grpc_arg));

// TODO(kriswuollett) Check that keys adhere to GRPC core library requirements

NSUInteger j = 0;
for (NSUInteger i = 0; i < argCount; ++i) {
grpc_arg *arg = &channelArgs->args[j];
arg->key = gpr_strdup([keys[i] UTF8String]);

id value = dictionary[keys[i]];
if ([value respondsToSelector:@selector(UTF8String)]) {
arg->type = GRPC_ARG_STRING;
arg->value.string = gpr_strdup([value UTF8String]);
j++;
} else if ([value respondsToSelector:@selector(intValue)]) {
int64_t value64 = [value longLongValue];
if (value64 <= INT_MAX || value64 >= INT_MIN) {
arg->type = GRPC_ARG_INTEGER;
arg->value.integer = (int)value64;
j++;
}
} else if (value != nil) {
arg->type = GRPC_ARG_POINTER;
arg->value.pointer.p = (__bridge_retained void *)value;
arg->value.pointer.vtable = &objc_arg_vtable;
j++;
}
}
channelArgs->num_args = j;

return channelArgs;
}