/* Copyright: (c) Kayne Ruse 2013-2015
 * 
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 * 
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 * 
 * 1. The origin of this software must not be misrepresented; you must not
 * claim that you wrote the original software. If you use this software
 * in a product, an acknowledgment in the product documentation would be
 * appreciated but is not required.
 * 
 * 2. Altered source versions must be plainly marked as such, and must not be
 * misrepresented as being the original software.
 * 
 * 3. This notice may not be removed or altered from any source
 * distribution.
*/
#include "server_application.hpp"

//utility functions
#include "sql_tools.hpp"

//std & STL
#include <stdexcept>
#include <chrono>
#include <iostream>
#include <sstream>
#include <string>

//-------------------------
//public methods
//-------------------------

//BUG: #35 The server fails without at least one room

void ServerApplication::Init(int argc, char* argv[]) {
	//NOTE: I might need to rearrange the init process so that lua & SQL can interact with the map system as needed.
	std::cout << "Beginning " << argv[0] << std::endl;

	//load the config settings
	config.Load("rsc/config.cfg", false, argc, argv);

	//-------------------------
	//Initialize the APIs
	//-------------------------

	//Init SDL
	if (SDL_Init(0)) {
		throw(std::runtime_error("Failed to initialize SDL"));
	}
	std::cout << "Initialized SDL" << std::endl;

	//Init SDL_net
	if (SDLNet_Init()) {
		throw(std::runtime_error("Failed to initialize SDL_net"));
	}
	network.Open(config.Int("server.port"));
	std::cout << "Initialized SDL_net" << std::endl;

	//Init SQL
	int ret = sqlite3_open_v2(config["server.dbname"].c_str(), &database, SQLITE_OPEN_READWRITE|SQLITE_OPEN_CREATE, nullptr);
	if (ret != SQLITE_OK || !database) {
		throw(std::runtime_error(std::string() + "Failed to initialize SQL: " + sqlite3_errmsg(database) ));
	}
	std::cout << "Initialized SQL" << std::endl;

	//Init lua
	luaState = luaL_newstate();
	if (!luaState) {
		throw(std::runtime_error("Failed to initialize lua"));
	}
	luaL_openlibs(luaState);

	std::cout << "Initialized lua" << std::endl;

	//append config["dir.scripts"] to the module path
	if (config["dir.scripts"].size() > 0) {
		//get the original path
		lua_getglobal(luaState, "package");
		lua_getfield(luaState, -1, "path");

		//build & push the message
		std::ostringstream path;
		path << lua_tostring(luaState, -1) << ";" << config["dir.scripts"] << "?.lua";
		lua_pushstring(luaState, path.str().c_str());

		//set the new path and clean up the stack
		lua_setfield(luaState, -3, "path");
		lua_pop(luaState, 2);

		std::cout << "\tLua script directory appended" << std::endl;
	}

	//-------------------------
	//Setup the objects
	//-------------------------

	//set the hooks
	accountMgr.SetDatabase(database);
	characterMgr.SetDatabase(database);

	roomMgr.SetLuaState(luaState);
	roomMgr.SetDatabase(database);

	std::cout << "Internal managers initialized" << std::endl;

	//-------------------------
	//Run the startup scripts
	//-------------------------

	//setup the database
	if (runSQLScript(database, config["dir.scripts"] + "setup_server.sql")) {
		throw(std::runtime_error("Failed to initialize SQL's setup script"));
	}
	std::cout << "Completed SQL's setup script" << std::endl;

	//run lua's startup script
	if (luaL_dofile(luaState, (config["dir.scripts"] + "setup_server.lua").c_str())) {
		throw(std::runtime_error(std::string() + "Failed to initialize lua's setup script: " + lua_tostring(luaState, -1) ));
	}
	std::cout << "Completed lua's setup script" << std::endl;

	//-------------------------
	//debug output
	//-------------------------

	//TODO: enable/disable these with a switch
#define DEBUG_OUTPUT_VAR(x) std::cout << "\t" << #x << ": " << x << std::endl;

	std::cout << "Internal sizes:" << std::endl;

	DEBUG_OUTPUT_VAR(NETWORK_VERSION);
	DEBUG_OUTPUT_VAR(sizeof(Region::type_t));
	DEBUG_OUTPUT_VAR(sizeof(Region));
	DEBUG_OUTPUT_VAR(REGION_WIDTH);
	DEBUG_OUTPUT_VAR(REGION_HEIGHT);
	DEBUG_OUTPUT_VAR(REGION_DEPTH);
	DEBUG_OUTPUT_VAR(REGION_TILE_FOOTPRINT);
	DEBUG_OUTPUT_VAR(REGION_SOLID_FOOTPRINT);
	DEBUG_OUTPUT_VAR(PACKET_STRING_SIZE);
	DEBUG_OUTPUT_VAR(PACKET_BUFFER_SIZE);
	DEBUG_OUTPUT_VAR(MAX_PACKET_SIZE);
	DEBUG_OUTPUT_VAR(static_cast<int>(SerialPacketType::LAST));

#undef DEBUG_OUTPUT_VAR

	//-------------------------
	//finalize the startup
	//-------------------------

	std::cout << "Startup completed successfully" << std::endl;

	//-------------------------
	//debugging
	//-------------------------

	//...
}

void ServerApplication::Proc() {
	SerialPacket* packetBuffer = reinterpret_cast<SerialPacket*>(new char[MAX_PACKET_SIZE]);
	memset(packetBuffer, 0, MAX_PACKET_SIZE); //zero the buffer

	while(running) {
		//suck in the waiting packets & process them
		while(network.Receive(packetBuffer)) {
			try {
				HandlePacket(packetBuffer);
			}
			catch(std::exception& e) {
				std::cerr << "HandlePacket Error: " << e.what() << std::endl;
			}
			memset(packetBuffer, 0, MAX_PACKET_SIZE); //reset the buffer
		}
		//update the internals
		//...

		//Check connections
		int disconnected = clientMgr.CheckConnections();
		if (disconnected != -1) {
			FullClientUnload(disconnected);
			std::cerr << "Client dropped: " << disconnected << std::endl;
		}

		//give the machine a break
		SDL_Delay(10);
	}
	delete reinterpret_cast<char*>(packetBuffer);
}

void ServerApplication::Quit() {
	std::cout << "Shutting down" << std::endl;

	//TODO: save the server state

	//close the managers
	accountMgr.UnloadAll();
	characterMgr.UnloadAll();
	clientMgr.UnloadAll();
	roomMgr.UnloadAll();

	//APIs
	lua_close(luaState);
	sqlite3_close_v2(database);
	network.Close();
	SDLNet_Quit();
	SDL_Quit();

	std::cout << "Clean exit" << std::endl;
}

//-------------------------
//direct incoming traffic
//-------------------------

void ServerApplication::HandlePacket(SerialPacket* const argPacket) {
	switch(argPacket->type) {
		//heartbeat system
		case SerialPacketType::PING:
			HandlePing(static_cast<ServerPacket*>(argPacket));
		break;
		case SerialPacketType::PONG:
			HandlePong(static_cast<ServerPacket*>(argPacket));
		break;

		//client connections
		case SerialPacketType::BROADCAST_REQUEST:
			HandleBroadcastRequest(static_cast<ServerPacket*>(argPacket));
		break;
		case SerialPacketType::JOIN_REQUEST:
			HandleJoinRequest(static_cast<ClientPacket*>(argPacket));
		break;
		case SerialPacketType::LOGIN_REQUEST:
			HandleLoginRequest(static_cast<ClientPacket*>(argPacket));
		break;

		//client disconnections
		case SerialPacketType::LOGOUT_REQUEST:
			HandleLogoutRequest(static_cast<ClientPacket*>(argPacket));
		break;
		case SerialPacketType::DISCONNECT_REQUEST:
			HandleDisconnectRequest(static_cast<ClientPacket*>(argPacket));
		break;

		//server commands
//		case SerialPacketType::DISCONNECT_FORCED:
//			HandleDisconnectForced(static_cast<ClientPacket*>(argPacket));
//		break;
		case SerialPacketType::SHUTDOWN_REQUEST:
			HandleShutdownRequest(static_cast<ClientPacket*>(argPacket));
		break;

		//data management & queries
		case SerialPacketType::REGION_REQUEST:
			HandleRegionRequest(static_cast<RegionPacket*>(argPacket));
		break;
		case SerialPacketType::QUERY_CHARACTER_EXISTS:
			HandleCharacterExists(static_cast<CharacterPacket*>(argPacket));
		break;

		//character management
		case SerialPacketType::CHARACTER_CREATE:
			HandleCharacterCreate(static_cast<CharacterPacket*>(argPacket));
		break;
		case SerialPacketType::CHARACTER_DELETE:
			HandleCharacterDelete(static_cast<CharacterPacket*>(argPacket));
		break;
		case SerialPacketType::CHARACTER_LOAD:
			HandleCharacterLoad(static_cast<CharacterPacket*>(argPacket));
		break;
		case SerialPacketType::CHARACTER_UNLOAD:
			HandleCharacterUnload(static_cast<CharacterPacket*>(argPacket));
		break;

/*		case SerialPacketType::QUERY_CHARACTER_EXISTS:
			//
		break;
		case SerialPacketType::QUERY_CHARACTER_STATS:
			//
		break;
		case SerialPacketType::QUERY_CHARACTER_LOCATION:
			//
		break;
*/
		//character movement
		case SerialPacketType::CHARACTER_MOVEMENT:
			HandleCharacterMovement(static_cast<CharacterPacket*>(argPacket));
		break;
		case SerialPacketType::CHARACTER_ATTACK:
			HandleCharacterAttack(static_cast<CharacterPacket*>(argPacket));
		break;
/*
		//enemy management
		//TODO: enemy management

		//TODO: text
*/
		//handle errors
		default: {
			std::ostringstream msg;
			msg << "Unknown SerialPacketType encountered in the server: ";
			msg << static_cast<int>(argPacket->type);
			throw(std::runtime_error(msg.str()));
		}
		break;
	}
}