/*  Starshatter OpenSource Distribution
    Copyright (c) 1997-2004, Destroyer Studios LLC.
    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 "Destroyer Studios" 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 HOLDER 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.

    SUBSYSTEM:    Stars
    FILE:         NetServerConfig.cpp
    AUTHOR:       John DiCamillo

*/

#include "MemDebug.h"
#include "NetServerConfig.h"
#include "NetUser.h"

#include "NetLayer.h"
#include "NetAddr.h"
#include "NetGame.h"
#include "NetHost.h"
#include "NetServer.h"
#include "HttpServer.h"
#include "HttpServletExec.h"
#include "NetLobbyServer.h"
#include "NetAuth.h"

#include "Token.h"
#include "Game.h"
#include "DataLoader.h"
#include "ParseUtil.h"
#include "resource.h"

// +--------------------------------------------------------------------+

NetServerConfig*     NetServerConfig::instance = 0;
extern const char*   versionInfo;

// +--------------------------------------------------------------------+

NetServerConfig::NetServerConfig()
{
    instance = this;

    hostname          = "0.0.0.0";
    name              = "Starshatter ";
    admin_name        = "system";
    admin_pass        = "manager";
    admin_port        = 11111;
    lobby_port        = 11100;
    game_port         = 11101;
    game_type         = NET_GAME_PUBLIC;
    auth_level        = NetAuth::NET_AUTH_STANDARD;
    poolsize          = 8;
    session_timeout   = 300;

    name += versionInfo;

    Load();
}

NetServerConfig::~NetServerConfig()
{
    instance = 0;

    banned_addrs.destroy();
    banned_names.destroy();
}

// +--------------------------------------------------------------------+

void
NetServerConfig::Initialize()
{
    if (!instance)
    instance = new(__FILE__,__LINE__) NetServerConfig();
}

void
NetServerConfig::Close()
{
    delete instance;
    instance = 0;
}

// +--------------------------------------------------------------------+

void
NetServerConfig::Load()
{
    // read the config file:
    BYTE*       block    = 0;
    int         blocklen = 0;
    int         port     = 0;

    char        filename[64];
    strcpy_s(filename, "server.cfg");

    FILE* f;
    ::fopen_s(&f, filename, "rb");

    if (f) {
        ::fseek(f, 0, SEEK_END);
        blocklen = ftell(f);
        ::fseek(f, 0, SEEK_SET);

        block = new(__FILE__,__LINE__) BYTE[blocklen+1];
        block[blocklen] = 0;

        ::fread(block, blocklen, 1, f);
        ::fclose(f);
    }

    if (blocklen == 0) {
        delete [] block;
        return;
    }

    Parser parser(new(__FILE__,__LINE__) BlockReader((const char*) block, blocklen));
    Term*  term = parser.ParseTerm();

    if (!term) {
        Print("ERROR: could not parse '%s'.\n", filename);
        delete [] block;
        return;
    }
    else {
        TermText* file_type = term->isText();
        if (!file_type || file_type->value() != "SERVER_CONFIG") {
            Print("WARNING: invalid '%s' file.  Using defaults\n", filename);
            delete [] block;
            return;
        }
    }

    do {
        delete term;

        term = parser.ParseTerm();

        if (term) {
            TermDef* def = term->isDef();
            if (def) {
                if (def->name()->value() == "hostname") {
                    GetDefText(instance->hostname, def, filename);
                }

                else if (def->name()->value() == "name") {
                    GetDefText(instance->name, def, filename);
                }

                else if (def->name()->value() == "admin_name") {
                    GetDefText(instance->admin_name, def, filename);
                }

                else if (def->name()->value() == "admin_pass") {
                    GetDefText(instance->admin_pass, def, filename);
                }

                else if (def->name()->value() == "game_pass") {
                    GetDefText(instance->game_pass, def, filename);
                }

                else if (def->name()->value() == "mission") {
                    GetDefText(instance->mission, def, filename);
                }

                else if (def->name()->value() == "auth_level") {
                    Text level;

                    if (def->term() && def->term()->isText()) {
                        GetDefText(level, def, filename);

                        level.toLower();

                        if (level.indexOf("min") == 0)
                        instance->auth_level = NetAuth::NET_AUTH_MINIMAL;

                        else if (level == "standard" || level == "std")
                        instance->auth_level = NetAuth::NET_AUTH_STANDARD;

                        else if (level == "secure")
                        instance->auth_level = NetAuth::NET_AUTH_SECURE;
                    }

                    else {
                        GetDefNumber(instance->auth_level, def, filename);
                    }
                }

                else if (def->name()->value() == "admin_port") {
                    GetDefNumber(port, def, filename);
                    if (port > 1024 && port < 48000)
                    instance->admin_port = (WORD) port;
                }

                else if (def->name()->value() == "lobby_port") {
                    GetDefNumber(port, def, filename);
                    if (port > 1024 && port < 48000)
                    instance->lobby_port = (WORD) port;
                }

                else if (def->name()->value() == "game_port") {
                    GetDefNumber(port, def, filename);
                    if (port > 1024 && port < 48000)
                    instance->game_port = (WORD) port;
                }

                else if (def->name()->value() == "game_type") {
                    Text type;
                    GetDefText(type, def, filename);
                    type.setSensitive(false);

                    if (type == "LAN")
                    instance->game_type = NET_GAME_LAN;

                    else if (type == "private")
                    instance->game_type = NET_GAME_PRIVATE;

                    else
                    instance->game_type = NET_GAME_PUBLIC;
                }

                else if (def->name()->value() == "poolsize") {
                    GetDefNumber(instance->poolsize, def, filename);
                }

                else if (def->name()->value() == "session_timeout") {
                    GetDefNumber(instance->session_timeout, def, filename);
                }

                else
                Print("WARNING: unknown label '%s' in '%s'\n",
                def->name()->value().data(), filename);
            }
            else {
                Print("WARNING: term ignored in '%s'\n", filename);
                term->print();
            }
        }
    }
    while (term);

    delete [] block;

    LoadBanList();
}

// +--------------------------------------------------------------------+

void
NetServerConfig::Save()
{
    FILE* f;
    fopen_s(&f, "server.cfg", "wb");
    if (f) {
        fprintf(f, "SERVER_CONFIG\n\n");
        fprintf(f, "hostname:        \"%s\"\n", instance->hostname.data());
        fprintf(f, "name:            \"%s\"\n", instance->name.data());
        fprintf(f, "admin_name:      \"%s\"\n", instance->admin_name.data());
        fprintf(f, "admin_pass:      \"%s\"\n", instance->admin_pass.data());
        fprintf(f, "game_pass:       \"%s\"\n", instance->game_pass.data());
        fprintf(f, "\n");
        fprintf(f, "admin_port:      %d\n", instance->admin_port);
        fprintf(f, "lobby_port:      %d\n", instance->lobby_port);
        fprintf(f, "game_port:       %d\n", instance->game_port);

        switch (instance->game_type) {
        case NET_GAME_LAN:
            fprintf(f, "game_type:       LAN\n");
            break;

        case NET_GAME_PRIVATE:
            fprintf(f, "game_type:       private\n");
            break;

        case NET_GAME_PUBLIC:
        default:
            fprintf(f, "game_type:       public\n");
            break;
        }

        switch (instance->auth_level) {
        case NetAuth::NET_AUTH_MINIMAL:
            fprintf(f, "auth_level:      minimal\n");
            break;

        case NetAuth::NET_AUTH_STANDARD:
        default:
            fprintf(f, "auth_level:      standard\n");
            break;

        case NetAuth::NET_AUTH_SECURE:
            fprintf(f, "auth_level:      secure\n");
            break;
        }

        fprintf(f, "\n");
        fprintf(f, "poolsize:        %d\n", instance->poolsize);
        fprintf(f, "session_timeout: %d\n", instance->session_timeout);

        if (mission.length() > 0) {
            fprintf(f, "\nmission:         \"%s\"\n", instance->mission.data());
        }

        fclose(f);
    }
}

// +--------------------------------------------------------------------+

Text
NetServerConfig::Clean(const char* s)
{
    if (!s || !*s) return Text();

    int len = strlen(s);
    char* buff = new(__FILE__,__LINE__) char[len+1];
    ZeroMemory(buff, len+1);

    char* p = buff;

    for (int i = 0; i < len; i++) {
        char c = s[i];

        if (c >= 32 && c < 127)
        *p++ = c;
    }

    Text result(buff);
    delete [] buff;

    return result;
}

// +--------------------------------------------------------------------+

void
NetServerConfig::LoadBanList()
{
    // read the config file:
    BYTE*       block    = 0;
    int         blocklen = 0;
    int         port     = 0;

    char        filename[64];
    strcpy_s(filename, "banned.cfg");

    FILE* f;
    ::fopen_s(&f, filename, "rb");

    if (f) {
        ::fseek(f, 0, SEEK_END);
        blocklen = ftell(f);
        ::fseek(f, 0, SEEK_SET);

        block = new(__FILE__,__LINE__) BYTE[blocklen+1];
        block[blocklen] = 0;

        ::fread(block, blocklen, 1, f);
        ::fclose(f);
    }

    if (blocklen == 0) {
        delete [] block;
        return;
    }

    Parser parser(new(__FILE__,__LINE__) BlockReader((const char*) block, blocklen));
    Term*  term = parser.ParseTerm();

    if (!term) {
        Print("ERROR: could not parse '%s'.\n", filename);
        delete [] block;
        return;
    }
    else {
        TermText* file_type = term->isText();
        if (!file_type || file_type->value() != "BANNED_CONFIG") {
            Print("WARNING: invalid '%s' file.\n", filename);
            delete [] block;
            return;
        }
    }

    banned_addrs.destroy();
    banned_names.destroy();

    do {
        delete term;

        term = parser.ParseTerm();

        if (term) {
            TermDef* def = term->isDef();
            if (def) {
                if (def->name()->value() == "name") {
                    Text name;
                    GetDefText(name, def, filename);
                    banned_names.append(new(__FILE__,__LINE__) Text(name));
                }

                else if (def->name()->value() == "addr") {
                    DWORD addr;
                    GetDefNumber(addr, def, filename);
                    banned_addrs.append(new(__FILE__,__LINE__) NetAddr(addr));
                }
            }

            else {
                Print("WARNING: term ignored in '%s'\n", filename);
                term->print();
            }
        }
    }
    while (term);

    delete [] block;
}

void
NetServerConfig::BanUser(NetUser* user)
{
    if (!user || IsUserBanned(user))
    return;

    NetAddr* user_addr = new(__FILE__,__LINE__) NetAddr(user->GetAddress().IPAddr());
    Text*    user_name = new(__FILE__,__LINE__) Text(user->Name());

    banned_addrs.append(user_addr);
    banned_names.append(user_name);

    FILE* f;
    fopen_s(&f, "banned.cfg", "wb");
    if (f) {
        fprintf(f, "BANNED_CONFIG\n\n");

        ListIter<NetAddr> a_iter = banned_addrs;
        while (++a_iter) {
            NetAddr* addr = a_iter.value();
            fprintf(f, "addr: 0x%08x  // %d.%d.%d.%d\n",
            addr->IPAddr(),
            addr->B1(),
            addr->B2(),
            addr->B3(),
            addr->B4());
        }

        fprintf(f, "\n");

        ListIter<Text> n_iter = banned_names;
        while (++n_iter) {
            Text* name = n_iter.value();
            fprintf(f, "name: \"%s\"\n", name->data());
        }

        fclose(f);
    }
}

bool
NetServerConfig::IsUserBanned(NetUser* user)
{
    if (user) {
        NetAddr  user_addr = user->GetAddress();
        Text     user_name = user->Name();

        user_addr.SetPort(0);

        return banned_addrs.contains(&user_addr) ||
        banned_names.contains(&user_name);
    }

    return false;
}