/* mbed Microcontroller Library
 * Copyright (c) 2017 ARM Limited
 *
 * 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.
 */
#if !FEATURE_LWIP
    #error [NOT_SUPPORTED] LWIP not supported for this target
#endif
#if DEVICE_EMAC
    #error [NOT_SUPPORTED] Not supported for WiFi targets
#endif

#include "mbed.h"
#include "EthernetInterface.h"
#include "TCPSocket.h"
#include "greentea-client/test_env.h"
#include "unity/unity.h"
#include "utest.h"

using namespace utest::v1;


#ifndef MBED_CFG_TCP_CLIENT_ECHO_BUFFER_SIZE
#define MBED_CFG_TCP_CLIENT_ECHO_BUFFER_SIZE 256
#endif

namespace {
    char tx_buffer[MBED_CFG_TCP_CLIENT_ECHO_BUFFER_SIZE] = {0};
    char rx_buffer[MBED_CFG_TCP_CLIENT_ECHO_BUFFER_SIZE] = {0};
    const char ASCII_MAX = '~' - ' ';
}

void prep_buffer(char *tx_buffer, size_t tx_size) {
    for (size_t i=0; i<tx_size; ++i) {
        tx_buffer[i] = (rand() % 10) + '0';
    }
}

void test_tcp_echo() {
    EthernetInterface eth;
    int err = eth.connect();

    if (err) {
        printf("MBED: failed to connect with an error of %d\r\n", err);
        TEST_ASSERT_EQUAL(0, err);
    }

    printf("MBED: TCPClient IP address is '%s'\n", eth.get_ip_address());
    printf("MBED: TCPClient waiting for server IP and port...\n");

    greentea_send_kv("target_ip", eth.get_ip_address());

    bool result = false;

    char recv_key[] = "host_port";
    char ipbuf[60] = {0};
    char portbuf[16] = {0};
    unsigned int port = 0;

    greentea_send_kv("host_ip", " ");
    greentea_parse_kv(recv_key, ipbuf, sizeof(recv_key), sizeof(ipbuf));

    greentea_send_kv("host_port", " ");
    greentea_parse_kv(recv_key, portbuf, sizeof(recv_key), sizeof(ipbuf));
    sscanf(portbuf, "%u", &port);

    printf("MBED: Server IP address received: %s:%d \n", ipbuf, port);

    TCPSocket sock(&eth);
    SocketAddress tcp_addr(ipbuf, port);
    if (sock.connect(tcp_addr) == 0) {
        printf("HTTP: Connected to %s:%d\r\n", ipbuf, port);
        printf("tx_buffer buffer size: %u\r\n", sizeof(tx_buffer));
        printf("rx_buffer buffer size: %u\r\n", sizeof(rx_buffer));

        prep_buffer(tx_buffer, sizeof(tx_buffer));
        sock.send(tx_buffer, sizeof(tx_buffer));
        printf("MBED: Finished sending\r\n");
        // Server will respond with HTTP GET's success code
        const int ret = sock.recv(rx_buffer, sizeof(rx_buffer));
        printf("MBED: Finished receiving\r\n");

        result = !memcmp(tx_buffer, rx_buffer, sizeof(tx_buffer));
        TEST_ASSERT_EQUAL(ret, sizeof(rx_buffer));
        TEST_ASSERT(result);
    }

    sock.close();
    eth.disconnect();
    TEST_ASSERT(result);
}


// Test setup
utest::v1::status_t test_setup(const size_t number_of_cases) {
    GREENTEA_SETUP(120, "tcp_echo");
    return verbose_test_setup_handler(number_of_cases);
}

Case cases[] = {
    Case("TCP echo", test_tcp_echo),
};

Specification specification(test_setup, cases);

int main() {
    return !Harness::run(specification);
}