/* Socket
 * Copyright (c) 2015 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.
 */

#include "SocketAddress.h"
#include "NetworkInterface.h"
#include "NetworkStack.h"
#include <string.h>
#include <stdio.h>
#include "ip4string.h"
#include "ip6string.h"



static bool ipv6_is_valid(const char *addr)
{
    // Check each digit for [0-9a-fA-F:]
    // Must also have at least 2 colons
    int colons = 0;
    for (int i = 0; addr[i]; i++) {
        if (!(addr[i] >= '0' && addr[i] <= '9') &&
                !(addr[i] >= 'a' && addr[i] <= 'f') &&
                !(addr[i] >= 'A' && addr[i] <= 'F') &&
                addr[i] != ':') {
            return false;
        }
        if (addr[i] == ':') {
            colons++;
        }
    }

    return colons >= 2;
}

SocketAddress::SocketAddress(nsapi_addr_t addr, uint16_t port)
{
    _ip_address = NULL;
    set_addr(addr);
    set_port(port);
}

SocketAddress::SocketAddress(const char *addr, uint16_t port)
{
    _ip_address = NULL;
    set_ip_address(addr);
    set_port(port);
}

SocketAddress::SocketAddress(const void *bytes, nsapi_version_t version, uint16_t port)
{
    _ip_address = NULL;
    set_ip_bytes(bytes, version);
    set_port(port);
}

SocketAddress::SocketAddress(const SocketAddress &addr)
{
    _ip_address = NULL;
    set_addr(addr.get_addr());
    set_port(addr.get_port());
}

bool SocketAddress::set_ip_address(const char *addr)
{
    delete[] _ip_address;
    _ip_address = NULL;

    if (addr && stoip4(addr, strlen(addr), _addr.bytes)) {
        _addr.version = NSAPI_IPv4;
        return true;
    } else if (addr && ipv6_is_valid(addr)) {
        _addr.version = NSAPI_IPv6;
        stoip6(addr, strlen(addr), _addr.bytes);
        return true;
    } else {
        _addr = nsapi_addr_t();
        return false;
    }
}

void SocketAddress::set_ip_bytes(const void *bytes, nsapi_version_t version)
{
    nsapi_addr_t addr;

    addr = nsapi_addr_t();
    addr.version = version;
    if (version == NSAPI_IPv6) {
        memcpy(addr.bytes, bytes, NSAPI_IPv6_BYTES);
    } else if (version == NSAPI_IPv4) {
        memcpy(addr.bytes, bytes, NSAPI_IPv4_BYTES);
    }
    set_addr(addr);
}

void SocketAddress::set_addr(nsapi_addr_t addr)
{
    delete[] _ip_address;
    _ip_address = NULL;
    _addr = addr;
}

void SocketAddress::set_port(uint16_t port)
{
    _port = port;
}

const char *SocketAddress::get_ip_address() const
{
    if (_addr.version == NSAPI_UNSPEC) {
        return NULL;
    }

    if (!_ip_address) {
        _ip_address = new char[NSAPI_IP_SIZE];
        if (_addr.version == NSAPI_IPv4) {
            ip4tos(_addr.bytes, _ip_address);
        } else if (_addr.version == NSAPI_IPv6) {
            ip6tos(_addr.bytes, _ip_address);
        }
    }

    return _ip_address;
}

const void *SocketAddress::get_ip_bytes() const
{
    return _addr.bytes;
}

nsapi_version_t SocketAddress::get_ip_version() const
{
    return _addr.version;
}

nsapi_addr_t SocketAddress::get_addr() const
{
    return _addr;
}

uint16_t SocketAddress::get_port() const
{
    return _port;
}

SocketAddress::operator bool() const
{
    if (_addr.version == NSAPI_IPv4) {
        for (int i = 0; i < NSAPI_IPv4_BYTES; i++) {
            if (_addr.bytes[i]) {
                return true;
            }
        }

        return false;
    } else if (_addr.version == NSAPI_IPv6) {
        for (int i = 0; i < NSAPI_IPv6_BYTES; i++) {
            if (_addr.bytes[i]) {
                return true;
            }
        }

        return false;
    } else {
        return false;
    }
}

SocketAddress &SocketAddress::operator=(const SocketAddress &addr)
{
    delete[] _ip_address;
    _ip_address = NULL;
    set_addr(addr.get_addr());
    set_port(addr.get_port());
    return *this;
}

bool operator==(const SocketAddress &a, const SocketAddress &b)
{
    if (!a && !b) {
        return true;
    } else if (a._addr.version != b._addr.version) {
        return false;
    } else if (a._addr.version == NSAPI_IPv4) {
        return memcmp(a._addr.bytes, b._addr.bytes, NSAPI_IPv4_BYTES) == 0;
    } else if (a._addr.version == NSAPI_IPv6) {
        return memcmp(a._addr.bytes, b._addr.bytes, NSAPI_IPv6_BYTES) == 0;
    }

    MBED_UNREACHABLE;
}

bool operator!=(const SocketAddress &a, const SocketAddress &b)
{
    return !(a == b);
}

void SocketAddress::_SocketAddress(NetworkStack *iface, const char *host, uint16_t port)
{
    _ip_address = NULL;

    // gethostbyname must check for literals, so can call it directly
    int err = iface->gethostbyname(host, this);
    _port = port;
    if (err) {
        _addr = nsapi_addr_t();
        _port = 0;
    }
}

SocketAddress::~SocketAddress()
{
    delete[] _ip_address;
}
