/*

 * Hedgewars, a free turn based strategy game

 * Copyright (C) 2012 Simeon Maxein <smaxein@googlemail.com>

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version 2

 * of the License, or (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

 */

#include "ipcprotocol.h"

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

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

#include "../md5/md5.h"

#include <stdio.h>

#include <stdbool.h>

#include <string.h>

#include <inttypes.h>

#include <stdlib.h>

int flib_ipc_append_message(flib_vector *vec, const char *fmt, ...) {

	int result = -1;

	if(!log_badargs_if2(vec==NULL, fmt==NULL)) {

		// 1 byte size prefix, 255 bytes max message length, 1 0-byte for vsnprintf

		char msgbuffer[257];

		// Format the message, leaving one byte at the start for the length

		va_list argp;

		va_start(argp, fmt);

		int msgSize = vsnprintf(msgbuffer+1, 256, fmt, argp);

		va_end(argp);

		if(!log_e_if(msgSize > 255, "Message too long (%u bytes)", (unsigned)msgSize)

				&& !log_e_if(msgSize < 0, "printf error")) {

			// Add the length prefix

			((uint8_t*)msgbuffer)[0] = msgSize;

			// Append it to the vector

			result = flib_vector_append(vec, msgbuffer, msgSize+1);

		}

	}

	return result;

}

int flib_ipc_append_mapconf(flib_vector *vec, const flib_map *map, bool mappreview) {

	int result = -1;

	flib_vector *tempvector = flib_vector_create();

	if(!log_badargs_if2(vec==NULL, map==NULL)) {

		bool error = false;

		if(map->mapgen == MAPGEN_NAMED) {

			error |= log_e_if(!map->name, "Missing map name")

					|| flib_ipc_append_message(tempvector, "emap %s", map->name);

		}

		if(!mappreview) {

			error |= log_e_if(!map->theme, "Missing map theme")

					|| flib_ipc_append_message(tempvector, "etheme %s", map->theme);

		}

		error |= flib_ipc_append_seed(tempvector, map->seed);

		error |= flib_ipc_append_message(tempvector, "e$template_filter %i", map->templateFilter);

		error |= flib_ipc_append_message(tempvector, "e$mapgen %i", map->mapgen);

		if(map->mapgen == MAPGEN_MAZE) {

			error |= flib_ipc_append_message(tempvector, "e$maze_size %i", map->mazeSize);

		}

		if(map->mapgen == MAPGEN_DRAWN) {

			/*

			 * We have to split the drawn map data into several edraw messages here because

			 * it can be longer than the maximum message size.

			 */

			const char *edraw = "edraw ";

			int edrawlen = strlen(edraw);

			for(size_t offset=0; offset<map->drawDataSize; offset+=200) {

				size_t bytesRemaining = map->drawDataSize-offset;

				int fragmentsize = bytesRemaining < 200 ? bytesRemaining : 200;

				uint8_t messagesize = edrawlen + fragmentsize;

				error |= flib_vector_append(tempvector, &messagesize, 1);

				error |= flib_vector_append(tempvector, edraw, edrawlen);

				error |= flib_vector_append(tempvector, map->drawData+offset, fragmentsize);

			}

		}

		if(!log_e_if(error, "Error generating map config")) {

			// Message created, now we can copy everything.

			flib_constbuffer constbuf = flib_vector_as_constbuffer(tempvector);

			if(!flib_vector_append(vec, constbuf.data, constbuf.size)) {

				result = 0;

			}

		}

	}

	flib_vector_destroy(tempvector);

	return result;

}

int flib_ipc_append_seed(flib_vector *vec, const char *seed) {

	if(log_badargs_if2(vec==NULL, seed==NULL)) {

		return -1;

	}

	return flib_ipc_append_message(vec, "eseed %s", seed);

}

int flib_ipc_append_script(flib_vector *vec, const char *script) {

	int result = -1;

	if(!log_badargs_if2(vec==NULL, script==NULL)) {

		result = flib_ipc_append_message(vec, "escript %s", script);

	}

	return result;

}

int flib_ipc_append_style(flib_vector *vec, const char *style) {

	int result = -1;

	char *copy = flib_strdupnull(style);

	if(!log_badargs_if(vec==NULL) && copy) {

		if(!strcmp("Normal", copy)) {

			// "Normal" means no gametype script

			// TODO if an empty script called "Normal" is added to the scripts directory this can be removed

			result = 0;

		} else {

			size_t len = strlen(copy);

			for(size_t i=0; i<len; i++) {

				if(copy[i] == ' ') {

					copy[i] = '_';

				}

			}

			result = flib_ipc_append_message(vec, "escript %s%s.lua", MULTIPLAYER_SCRIPT_PATH, copy);

		}

	}

	free(copy);

	return result;

}

static uint32_t buildModFlags(const flib_scheme *scheme) {

	uint32_t result = 0;

	for(int i=0; i<flib_meta.modCount; i++) {

		if(scheme->mods[i]) {

			int bitmaskIndex = flib_meta.mods[i].bitmaskIndex;

			result |= (UINT32_C(1) << bitmaskIndex);

		}

	}

	return result;

}

int flib_ipc_append_gamescheme(flib_vector *vec, const flib_scheme *scheme) {

	int result = -1;

	flib_vector *tempvector = flib_vector_create();

	if(!log_badargs_if2(vec==NULL, scheme==NULL) && tempvector) {

		bool error = false;

		error |= flib_ipc_append_message(tempvector, "e$gmflags %"PRIu32, buildModFlags(scheme));

		for(int i=0; i<flib_meta.settingCount; i++) {

			if(flib_meta.settings[i].engineCommand) {

				int value = scheme->settings[i];

				if(flib_meta.settings[i].maxMeansInfinity) {

					value = value>=flib_meta.settings[i].max ? 9999 : value;

				}

				if(flib_meta.settings[i].times1000) {

					value *= 1000;

				}

				error |= flib_ipc_append_message(tempvector, "%s %i", flib_meta.settings[i].engineCommand, value);

			}

		}

		if(!error) {

			// Message created, now we can copy everything.

			flib_constbuffer constbuf = flib_vector_as_constbuffer(tempvector);

			if(!flib_vector_append(vec, constbuf.data, constbuf.size)) {

				result = 0;

			}

		}

	}

	flib_vector_destroy(tempvector);

	return result;

}

static int appendWeaponSet(flib_vector *vec, flib_weaponset *set) {

	return flib_ipc_append_message(vec, "eammloadt %s", set->loadout)

		|| flib_ipc_append_message(vec, "eammprob %s", set->crateprob)

		|| flib_ipc_append_message(vec, "eammdelay %s", set->delay)

		|| flib_ipc_append_message(vec, "eammreinf %s", set->crateammo);

}

static void calculateMd5Hex(const char *in, char out[33]) {

	md5_state_t md5state;

	uint8_t md5bytes[16];

	md5_init(&md5state);

	md5_append(&md5state, (unsigned char*)in, strlen(in));

	md5_finish(&md5state, md5bytes);

	for(int i=0;i<sizeof(md5bytes); i++) {

		snprintf(out+i*2, 3, "%02x", (unsigned)md5bytes[i]);

	}

}

static int flib_ipc_append_addteam(flib_vector *vec, const flib_team *team, bool perHogAmmo, bool noAmmoStore) {

	int result = -1;

	flib_vector *tempvector = flib_vector_create();

	if(!log_badargs_if2(vec==NULL, team==NULL) && tempvector) {

		bool error = false;

		if(!perHogAmmo && !noAmmoStore) {

			error = error

					|| appendWeaponSet(tempvector, team->hogs[0].weaponset)

					|| flib_ipc_append_message(tempvector, "eammstore");

		}

		char md5Hex[33];

		calculateMd5Hex(team->ownerName ? team->ownerName : "", md5Hex);

		if(team->colorIndex<0 || team->colorIndex>=flib_teamcolor_count) {

			flib_log_e("Color index out of bounds for team %s: %i", team->name, team->colorIndex);

			error = true;

		} else {

			error |= flib_ipc_append_message(tempvector, "eaddteam %s %"PRIu32" %s", md5Hex, flib_teamcolors[team->colorIndex], team->name);

		}

		if(team->remoteDriven) {

			error |= flib_ipc_append_message(tempvector, "erdriven");

		}

		error |= flib_ipc_append_message(tempvector, "egrave %s", team->grave);

		error |= flib_ipc_append_message(tempvector, "efort %s", team->fort);

		error |= flib_ipc_append_message(tempvector, "evoicepack %s", team->voicepack);

		error |= flib_ipc_append_message(tempvector, "eflag %s", team->flag);

		for(int i=0; i<team->bindingCount; i++) {

			error |= flib_ipc_append_message(tempvector, "ebind %s %s", team->bindings[i].binding, team->bindings[i].action);

		}

		for(int i=0; i<team->hogsInGame; i++) {

			if(perHogAmmo && !noAmmoStore) {

				error |= appendWeaponSet(tempvector, team->hogs[i].weaponset);

			}

			error |= flib_ipc_append_message(tempvector, "eaddhh %i %i %s", team->hogs[i].difficulty, team->hogs[i].initialHealth, team->hogs[i].name);

			error |= flib_ipc_append_message(tempvector, "ehat %s", team->hogs[i].hat);

		}

		if(!error) {

			// Message created, now we can copy everything.

			flib_constbuffer constbuf = flib_vector_as_constbuffer(tempvector);

			if(!flib_vector_append(vec, constbuf.data, constbuf.size)) {

				result = 0;

			}

		}

	}

	flib_vector_destroy(tempvector);

	return result;

}

int flib_ipc_append_fullconfig(flib_vector *vec, const flib_gamesetup *setup, bool netgame) {

	int result = -1;

	flib_vector *tempvector = flib_vector_create();

	if(!log_badargs_if2(vec==NULL, setup==NULL) && tempvector) {

		bool error = false;

		bool perHogAmmo = false;

		bool sharedAmmo = false;

		error |= flib_ipc_append_message(vec, netgame ? "TN" : "TL");

		if(setup->map) {

			error |= flib_ipc_append_mapconf(tempvector, setup->map, false);

		}

		if(setup->style) {

			error |= flib_ipc_append_style(tempvector, setup->style);

		}

		if(setup->gamescheme) {

			error |= flib_ipc_append_gamescheme(tempvector, setup->gamescheme);

			sharedAmmo = flib_scheme_get_mod(setup->gamescheme, "sharedammo");

			// Shared ammo has priority over per-hog ammo

			perHogAmmo = !sharedAmmo && flib_scheme_get_mod(setup->gamescheme, "perhogammo");

		}

		if(setup->teamlist->teams && setup->teamlist->teamCount>0) {

			int *clanColors = flib_calloc(setup->teamlist->teamCount, sizeof(int));

			if(!clanColors) {

				error = true;

			} else {

				int clanCount = 0;

				for(int i=0; !error && i<setup->teamlist->teamCount; i++) {

					flib_team *team = setup->teamlist->teams[i];

					// Find the clan index of this team (clans are identified by color).

					bool newClan = false;

					int clan = 0;

					while(clan<clanCount && clanColors[clan] != team->colorIndex) {

						clan++;

					}

					if(clan==clanCount) {

						newClan = true;

						clanCount++;

						clanColors[clan] = team->colorIndex;

					}

					// If shared ammo is active, only add an ammo store for the first team in each clan.

					bool noAmmoStore = sharedAmmo&&!newClan;

					error |= flib_ipc_append_addteam(tempvector, setup->teamlist->teams[i], perHogAmmo, noAmmoStore);

				}

			}

			free(clanColors);

		}

		error |= flib_ipc_append_message(tempvector, "!");

		if(!error) {

			// Message created, now we can copy everything.

			flib_constbuffer constbuf = flib_vector_as_constbuffer(tempvector);

			if(!flib_vector_append(vec, constbuf.data, constbuf.size)) {

				result = 0;

			}

		}

	}

	return result;

}