#include "gameconn.h"

#include "ipcbase.h"

#include "ipcprotocol.h"

#include "../util/logging.h"

#include "../util/util.h"

#include "../hwconsts.h"

#include <stdbool.h>

#include <stdlib.h>

#include <string.h>

typedef enum {

	AWAIT_CONNECTION,

	CONNECTED,

	FINISHED

} gameconn_state;

struct _flib_gameconn {

	flib_ipcbase *ipcBase;

	flib_vector *configBuffer;

	flib_vector *demoBuffer;

	char *playerName;

	gameconn_state state;

	bool netgame;

	void (*onConnectCb)(void* context);

	void *onConnectCtx;

	void (*onDisconnectCb)(void* context, int reason);

	void *onDisconnectCtx;

	void (*onErrorMessageCb)(void* context, const char *msg);

	void *onErrorMessageCtx;

	void (*onChatCb)(void* context, const char *msg, bool teamchat);

	void *onChatCtx;

	void (*onGameRecordedCb)(void *context, const uint8_t *record, int size, bool isSavegame);

	void *onGameRecordedCtx;

	void (*onEngineMessageCb)(void *context, const uint8_t *em, size_t size);

	void *onEngineMessageCtx;

	bool running;

	bool destroyRequested;

};

static void defaultCallback_onConnect(void* context) {}

static void defaultCallback_onDisconnect(void* context, int reason) {}

static void defaultCallback_onErrorMessage(void* context, const char *msg) {

	flib_log_w("Error from engine (no callback set): %s", msg);

}

static void defaultCallback_onChat(void* context, const char *msg, bool teamchat) {}

static void defaultCallback_onGameRecorded(void *context, const uint8_t *record, int size, bool isSavegame) {}

static void defaultCallback_onEngineMessage(void *context, const uint8_t *em, size_t size) {}

static void clearCallbacks(flib_gameconn *conn) {

	conn->onConnectCb = &defaultCallback_onConnect;

	conn->onDisconnectCb = &defaultCallback_onDisconnect;

	conn->onErrorMessageCb = &defaultCallback_onErrorMessage;

	conn->onChatCb = &defaultCallback_onChat;

	conn->onGameRecordedCb = &defaultCallback_onGameRecorded;

	conn->onEngineMessageCb = &defaultCallback_onEngineMessage;

}

static flib_gameconn *flib_gameconn_create_partial(bool record, const char *playerName, bool netGame) {

	flib_gameconn *result = NULL;

	if(!log_badparams_if(!playerName)) {

		flib_gameconn *tempConn = flib_calloc(1, sizeof(flib_gameconn));

		if(tempConn) {

			tempConn->ipcBase = flib_ipcbase_create();

			tempConn->configBuffer = flib_vector_create();

			tempConn->playerName = flib_strdupnull(playerName);

			if(tempConn->ipcBase && tempConn->configBuffer && tempConn->playerName) {

				if(record) {

					tempConn->demoBuffer = flib_vector_create();

				}

				tempConn->state = AWAIT_CONNECTION;

				tempConn->netgame = netGame;

				clearCallbacks(tempConn);

				result = tempConn;

				tempConn = NULL;

			}

		}

		flib_gameconn_destroy(tempConn);

	}

	return result;

}

flib_gameconn *flib_gameconn_create(const char *playerName, const flib_gamesetup *setup, bool netgame) {

	flib_gameconn *result = NULL;

	flib_gameconn *tempConn = flib_gameconn_create_partial(true, playerName, netgame);

	if(tempConn) {

		if(flib_ipc_append_fullconfig(tempConn->configBuffer, setup, netgame)) {

			flib_log_e("Error generating full game configuration for the engine.");

		} else {

			result = tempConn;

			tempConn = NULL;

		}

	}

	flib_gameconn_destroy(tempConn);

	return result;

}

flib_gameconn *flib_gameconn_create_playdemo(const uint8_t *demo, int size) {

	flib_gameconn *result = NULL;

	flib_gameconn *tempConn = flib_gameconn_create_partial(false, "Player", false);

	if(tempConn) {

		if(!flib_vector_append(tempConn->configBuffer, demo, size)) {

			result = tempConn;

			tempConn = NULL;

		}

	}

	flib_gameconn_destroy(tempConn);

	return result;

}

flib_gameconn *flib_gameconn_create_loadgame(const char *playerName, const uint8_t *save, int size) {

	flib_gameconn *result = NULL;

	flib_gameconn *tempConn = flib_gameconn_create_partial(true, playerName, false);

	if(tempConn) {

		if(!flib_vector_append(tempConn->configBuffer, save, size)) {

			result = tempConn;

			tempConn = NULL;

		}

	}

	flib_gameconn_destroy(tempConn);

	return result;

}

flib_gameconn *flib_gameconn_create_campaign(const char *playerName, const char *seed, const char *script) {

	flib_gameconn *result = NULL;

	flib_gameconn *tempConn = flib_gameconn_create_partial(true, playerName, false);

	if(tempConn) {

		if(!flib_ipc_append_message(tempConn->configBuffer, "TL")

				&& !flib_ipc_append_seed(tempConn->configBuffer, seed)

				&& !flib_ipc_append_script(tempConn->configBuffer, script)

				&& !flib_ipc_append_message(tempConn->configBuffer, "!")) {

			result = tempConn;

			tempConn = NULL;

		}

	}

	flib_gameconn_destroy(tempConn);

	return result;

}

void flib_gameconn_destroy(flib_gameconn *conn) {

	if(conn) {

		if(conn->running) {

			/*

			 * The function was called from a callback, so the tick function is still running

			 * and we delay the actual destruction. We ensure no further callbacks will be

			 * sent to prevent surprises.

			 */

			clearCallbacks(conn);

			conn->destroyRequested = true;

		} else {

			flib_ipcbase_destroy(conn->ipcBase);

			flib_vector_destroy(conn->configBuffer);

			flib_vector_destroy(conn->demoBuffer);

			free(conn->playerName);

			free(conn);

		}

	}

}

int flib_gameconn_getport(flib_gameconn *conn) {

	if(!log_badparams_if(!conn)) {

		return flib_ipcbase_port(conn->ipcBase);

	}

	return 0;

}

static void demo_append(flib_gameconn *conn, const void *data, size_t len) {

	if(conn->demoBuffer) {

		if(flib_vector_append(conn->demoBuffer, data, len)) {

			flib_log_e("Error recording demo: Out of memory.");

			flib_vector_destroy(conn->demoBuffer);

			conn->demoBuffer = NULL;

		}

	}

}

static int format_chatmessage(uint8_t buffer[257], const char *playerName, const char *message) {

	size_t msglen = strlen(message);

	// If the message starts with /me, it will be displayed differently.

	bool meMessage = msglen >= 4 && !memcmp(message, "/me ", 4);

	const char *template = meMessage ? "s\x02* %s %s  " : "s\x01%s: %s  ";

	int size = snprintf((char*)buffer+1, 256, template, playerName, meMessage ? message+4 : message);

	if(size>0) {

		buffer[0] = size>255 ? 255 : size;

		return 0;

	} else {

		return -1;

	}

}

static void demo_append_chatmessage(flib_gameconn *conn, const char *message) {

	// Chat messages are reformatted to make them look as if they were received, not sent.

	uint8_t converted[257];

	if(!format_chatmessage(converted, conn->playerName, message)) {

		demo_append(conn, converted, converted[0]+1);

	}

}

static void demo_replace_gamemode(flib_buffer buf, char gamemode) {

	size_t msgStart = 0;

	uint8_t *data = (uint8_t*)buf.data;

	while(msgStart+2 < buf.size) {

		if(!memcmp(data+msgStart, "\x02T", 2)) {

			data[msgStart+2] = gamemode;

		}

		msgStart += (uint8_t)data[msgStart]+1;

	}

}

int flib_gameconn_send_enginemsg(flib_gameconn *conn, const uint8_t *data, size_t len) {

	int result = -1;

	if(!log_badparams_if(!conn || (!data && len>0))

			&& !flib_ipcbase_send_raw(conn->ipcBase, data, len)) {

		demo_append(conn, data, len);

		result = 0;

	}

	return result;

}

int flib_gameconn_send_textmsg(flib_gameconn *conn, int msgtype, const char *msg) {

	int result = -1;

	if(!conn || !msg) {

		flib_log_e("null parameter in flib_gameconn_send_textmsg");

	} else {

		uint8_t converted[257];

		int size = snprintf((char*)converted+1, 256, "s%c%s", (char)msgtype, msg);

		if(size>0) {

			converted[0] = size>255 ? 255 : size;

			if(!flib_ipcbase_send_raw(conn->ipcBase, converted, converted[0]+1)) {

				demo_append(conn, converted, converted[0]+1);

				result = 0;

			}

		}

	}

	return result;

}

int flib_gameconn_send_chatmsg(flib_gameconn *conn, const char *playername, const char *msg) {

	int result = -1;

	uint8_t converted[257];

	if(!conn || !playername || !msg) {

		flib_log_e("null parameter in flib_gameconn_send_chatmsg");

	} else if(format_chatmessage(converted, playername, msg)) {

		flib_log_e("Error formatting message in flib_gameconn_send_chatmsg");

	} else if(!flib_ipcbase_send_raw(conn->ipcBase, converted, converted[0]+1)) {

		demo_append(conn, converted, converted[0]+1);

		result = 0;

	}

	return result;

}

void flib_gameconn_onConnect(flib_gameconn *conn, void (*callback)(void* context), void* context) {

	if(!conn) {

		flib_log_e("null parameter in flib_gameconn_onConnect");

	} else {

		conn->onConnectCb = callback ? callback : &defaultCallback_onConnect;

		conn->onConnectCtx = context;

	}

}

void flib_gameconn_onDisconnect(flib_gameconn *conn, void (*callback)(void* context, int reason), void* context) {

	if(!conn) {

		flib_log_e("null parameter in flib_gameconn_onDisconnect");

	} else {

		conn->onDisconnectCb = callback ? callback : &defaultCallback_onDisconnect;

		conn->onDisconnectCtx = context;

	}

}

void flib_gameconn_onErrorMessage(flib_gameconn *conn, void (*callback)(void* context, const char *msg), void* context) {

	if(!conn) {

		flib_log_e("null parameter in flib_gameconn_onErrorMessage");

	} else {

		conn->onErrorMessageCb = callback ? callback : &defaultCallback_onErrorMessage;

		conn->onErrorMessageCtx = context;

	}

}

void flib_gameconn_onChat(flib_gameconn *conn, void (*callback)(void* context, const char *msg, bool teamchat), void* context) {

	if(!conn) {

		flib_log_e("null parameter in flib_gameconn_onChat");

	} else {

		conn->onChatCb = callback ? callback : &defaultCallback_onChat;

		conn->onChatCtx = context;

	}

}

void flib_gameconn_onGameRecorded(flib_gameconn *conn, void (*callback)(void *context, const uint8_t *record, int size, bool isSavegame), void* context) {

	if(!conn) {

		flib_log_e("null parameter in flib_gameconn_onGameRecorded");

	} else {

		conn->onGameRecordedCb = callback ? callback : &defaultCallback_onGameRecorded;

		conn->onGameRecordedCtx = context;

	}

}

void flib_gameconn_onEngineMessage(flib_gameconn *conn, void (*callback)(void *context, const uint8_t *em, size_t size), void* context) {

	if(!conn) {

		flib_log_e("null parameter in flib_gameconn_onEngineMessage");

	} else {

		conn->onEngineMessageCb = callback ? callback : &defaultCallback_onEngineMessage;

		conn->onEngineMessageCtx = context;

	}

}

static void flib_gameconn_wrappedtick(flib_gameconn *conn) {

	if(conn->state == AWAIT_CONNECTION) {

		flib_ipcbase_accept(conn->ipcBase);

		switch(flib_ipcbase_state(conn->ipcBase)) {

		case IPC_CONNECTED:

			{

				flib_constbuffer configBuffer = flib_vector_as_constbuffer(conn->configBuffer);

				if(flib_ipcbase_send_raw(conn->ipcBase, configBuffer.data, configBuffer.size)) {

					conn->state = FINISHED;

					conn->onDisconnectCb(conn->onDisconnectCtx, GAME_END_ERROR);

					return;

				} else {

					demo_append(conn, configBuffer.data, configBuffer.size);

					conn->state = CONNECTED;

					conn->onConnectCb(conn->onConnectCtx);

					if(conn->destroyRequested) {

						return;

					}

				}

			}

			break;

		case IPC_NOT_CONNECTED:

			conn->state = FINISHED;

			conn->onDisconnectCb(conn->onDisconnectCtx, GAME_END_ERROR);

			return;

		default:

			break;

		}

	}

	if(conn->state == CONNECTED) {

		uint8_t msgbuffer[257];

		int len;

		while(!conn->destroyRequested && (len = flib_ipcbase_recv_message(conn->ipcBase, msgbuffer))>=0) {

			if(len<2) {

				flib_log_w("Received short message from IPC (<2 bytes)");

				continue;

			}

			switch(msgbuffer[1]) {

			case '?':	// Ping

				// The pong is already part of the config message

				break;

			case 'C':	// Config query

				// And we already send the config message on connecting.

				break;

			case 'E':	// Error message

				if(len>=3) {

					msgbuffer[len-2] = 0;

					conn->onErrorMessageCb(conn->onErrorMessageCtx, (char*)msgbuffer+2);

				}

				break;

			case 'i':	// Statistics

				// TODO stats

				break;

			case 'Q':	// Game interrupted

			case 'H':	// Game halted

			case 'q':	// game finished

				{

					int reason = msgbuffer[1]=='Q' ? GAME_END_INTERRUPTED : msgbuffer[1]=='H' ? GAME_END_HALTED : GAME_END_FINISHED;

					bool savegame = (reason != GAME_END_FINISHED) && !conn->netgame;

					if(conn->demoBuffer) {

						flib_buffer demoBuffer = flib_vector_as_buffer(conn->demoBuffer);

						demo_replace_gamemode(demoBuffer, savegame ? 'S' : 'D');

						conn->onGameRecordedCb(conn->onGameRecordedCtx, demoBuffer.data, demoBuffer.size, savegame);

						if(conn->destroyRequested) {

							return;

						}

					}

					conn->state = FINISHED;

					conn->onDisconnectCb(conn->onDisconnectCtx, reason);

					return;

				}

			case 's':	// Chat message

				if(len>=3) {

					msgbuffer[len-2] = 0;

					demo_append_chatmessage(conn, (char*)msgbuffer+2);

					conn->onChatCb(conn->onChatCtx, (char*)msgbuffer+2, false);

				}

				break;

			case 'b':	// Teamchat message

				if(len>=3) {

					msgbuffer[len-2] = 0;

					conn->onChatCb(conn->onChatCtx, (char*)msgbuffer+2, true);

				}

				break;

			default:	// Engine message

				demo_append(conn, msgbuffer, len);

				conn->onEngineMessageCb(conn->onEngineMessageCtx, msgbuffer, len);

				break;

			}

		}

	}

	if(flib_ipcbase_state(conn->ipcBase) == IPC_NOT_CONNECTED) {

		conn->state = FINISHED;

		conn->onDisconnectCb(conn->onDisconnectCtx, GAME_END_ERROR);

	}

}

void flib_gameconn_tick(flib_gameconn *conn) {

	if(!conn) {

		flib_log_e("null parameter in flib_gameconn_tick");

	} else if(conn->running) {

		flib_log_w("Call to flib_gameconn_tick from a callback");

	} else if(conn->state == FINISHED) {

		flib_log_w("Call to flib_gameconn_tick, but we are already done.");

	} else {

		conn->running = true;

		flib_gameconn_wrappedtick(conn);

		conn->running = false;

		if(conn->destroyRequested) {

			flib_gameconn_destroy(conn);

		}

	}

}