/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#include "twp/detection.h"
#include "twp/lighting.h"
#include "twp/object.h"
#include "twp/resmanager.h"
#include "twp/room.h"
#include "twp/squtil.h"
#include "twp/squirrel/squirrel.h"
#include "twp/squirrel/sqvm.h"
#include "twp/squirrel/sqstring.h"
#include "twp/squirrel/sqstate.h"
#include "twp/squirrel/sqtable.h"
#include "twp/squirrel/sqstdaux.h"
#include "twp/squirrel/sqfuncproto.h"
#include "twp/squirrel/sqclosure.h"
#include "twp/thread.h"

namespace Twp {

SQInteger sqpush(HSQUIRRELVM v) {
	return 0;
}

template<>
SQInteger sqpush(HSQUIRRELVM v, int value) {
	sq_pushinteger(v, value);
	return 1;
}

template<>
SQInteger sqpush(HSQUIRRELVM v, long long value) {
	sq_pushinteger(v, (SQInteger)value);
	return 1;
}

template<>
SQInteger sqpush(HSQUIRRELVM v, float value) {
	sq_pushfloat(v, value);
	return 1;
}

template<>
SQInteger sqpush(HSQUIRRELVM v, double value) {
	sq_pushfloat(v, (SQFloat)value);
	return 1;
}

template<>
SQInteger sqpush(HSQUIRRELVM v, bool value) {
	sq_pushinteger(v, value ? 1 : 0);
	return 1;
}

template<>
SQInteger sqpush(HSQUIRRELVM v, Common::String value) {
	sq_pushstring(v, value.c_str(), value.size());
	return 1;
}

template<>
SQInteger sqpush(HSQUIRRELVM v, const char *value) {
	sq_pushstring(v, value, -1);
	return 1;
}

template<>
SQInteger sqpush(HSQUIRRELVM v, HSQOBJECT value) {
	sq_pushobject(v, value);
	return 1;
}

template<>
SQInteger sqpush(HSQUIRRELVM v, Vector2i value) {
	sq_newtable(v);
	sq_pushstring(v, "x", -1);
	sq_pushinteger(v, value.x);
	sq_newslot(v, -3, SQFalse);
	sq_pushstring(v, "y", -1);
	sq_pushinteger(v, value.y);
	sq_newslot(v, -3, SQFalse);
	return 1;
}

template<>
SQInteger sqpush(HSQUIRRELVM v, Math::Vector2d value) {
	return sqpush(v, (Vector2i)value);
}

template<>
SQInteger sqpush(HSQUIRRELVM v, Rectf value) {
	sq_newtable(v);
	sq_pushstring(v, "x1", -1);
	sq_pushinteger(v, value.left());
	sq_newslot(v, -3, SQFalse);
	sq_pushstring(v, "y1", -1);
	sq_pushinteger(v, value.bottom());
	sq_newslot(v, -3, SQFalse);
	sq_pushstring(v, "x2", -1);
	sq_pushinteger(v, value.right());
	sq_newslot(v, -3, SQFalse);
	sq_pushstring(v, "y2", -1);
	sq_pushinteger(v, value.top());
	sq_newslot(v, -3, SQFalse);
	return 1;
}

template<>
HSQOBJECT sqtoobj(HSQUIRRELVM v, SQInteger value) {
	SQObject o;
	o._type = OT_INTEGER;
	o._unVal.nInteger = value;
	return o;
}

template<>
HSQOBJECT sqtoobj(HSQUIRRELVM v, const SQChar *value) {
	SQObject o;
	o._type = OT_STRING;
	o._unVal.pString = SQString::Create(_ss(v), value);
	return o;
}

template<>
SQRESULT sqget(HSQUIRRELVM v, int i, SQInteger &value) {
	return sq_getinteger(v, i, &value);
}

template<>
SQRESULT sqget(HSQUIRRELVM v, int i, bool &value) {
	SQInteger itg;
	SQRESULT result = sq_getinteger(v, i, &itg);
	value = itg != 0;
	return result;
}

template<>
SQRESULT sqget(HSQUIRRELVM v, int i, float &value) {
	SQFloat f;
	SQRESULT result = sq_getfloat(v, i, &f);
	value = static_cast<float>(f);
	return result;
}

template<>
SQRESULT sqget(HSQUIRRELVM v, int i, Common::String &value) {
	const SQChar *s;
	SQRESULT result = sq_getstring(v, i, &s);
	value = s;
	return result;
}

template<>
SQRESULT sqget(HSQUIRRELVM v, int i, const SQChar *&value) {
	return sq_getstring(v, i, &value);
}

template<>
SQRESULT sqget(HSQUIRRELVM v, int i, HSQOBJECT &value) {
	return sq_getstackobj(v, i, &value);
}

void sqgetarray(HSQUIRRELVM v, HSQOBJECT o, Common::Array<Common::String> &arr) {
	sq_pushobject(v, o);
	sq_pushnull(v);
	while (SQ_SUCCEEDED(sq_next(v, -2))) {
		const SQChar *str;
		sq_getstring(v, -1, &str);
		arr.push_back(str);
		sq_pop(v, 2);
	}
	sq_pop(v, 1);
}

SQRESULT sqgetarray(HSQUIRRELVM v, int i, Common::Array<Common::String> &arr) {
	HSQOBJECT obj;
	SQRESULT result = sq_getstackobj(v, i, &obj);
	sqgetarray(v, obj, arr);
	return result;
}

void setId(HSQOBJECT &o, int id) {
	sqsetf(o, "_id", id);
}

bool sqrawexists(HSQOBJECT obj, const Common::String &name) {
	HSQUIRRELVM v = g_twp->getVm();
	SQInteger top = sq_gettop(v);
	sqpush(v, obj);
	sq_pushstring(v, name.c_str(), -1);
	if (SQ_SUCCEEDED(sq_rawget(v, -2))) {
		SQObjectType oType = sq_gettype(v, -1);
		sq_settop(v, top);
		return oType != OT_NULL;
	}
	sq_settop(v, top);
	return false;
}

void sqsetdelegate(HSQOBJECT obj, HSQOBJECT del) {
	HSQUIRRELVM v = g_twp->getVm();
	sqpush(v, obj);
	sqpush(v, del);
	sq_setdelegate(v, -2);
	sq_pop(v, 1);
}

HSQOBJECT sqrootTbl(HSQUIRRELVM v) {
	HSQOBJECT result;
	sq_resetobject(&result);
	sq_pushroottable(v);
	sq_getstackobj(v, -1, &result);
	sq_pop(v, 1);
	return result;
}

void sqcall(const char *name, const Common::Array<HSQOBJECT> &args) {
	HSQUIRRELVM v = g_twp->getVm();
	HSQOBJECT o = sqrootTbl(v);
	SQInteger top = sq_gettop(v);
	sqpushfunc(v, o, name);

	sq_pushobject(v, o);
	for (size_t i = 0; i < args.size(); i++) {
		sq_pushobject(v, args[i]);
	}
	sq_call(v, 1 + args.size(), SQFalse, SQTrue);
	sq_settop(v, top);
}

int getId(HSQOBJECT table) {
	SQInteger result = 0;
	(void)sqgetf(table, "_id", result);
	return (int)result;
}

Common::SharedPtr<Room> sqroom(HSQOBJECT table) {
	int id = getId(table);
	return getRoom(id);
}

Common::SharedPtr<Room> getRoom(int id) {
	for (size_t i = 0; i < g_twp->_rooms.size(); i++) {
		Common::SharedPtr<Room> room(g_twp->_rooms[i]);
		if (getId(room->_table) == id)
			return room;
	}
	return nullptr;
}

Common::SharedPtr<Room> sqroom(HSQUIRRELVM v, int i) {
	HSQOBJECT table;
	if (SQ_SUCCEEDED(sqget(v, i, table))) {
		return sqroom(table);
	}
	return nullptr;
}

Common::SharedPtr<Object> sqobj(int id) {
	return g_twp->_resManager->_allObjects[id];
}

Common::SharedPtr<Object> sqobj(HSQOBJECT table) {
	int id = getId(table);
	return sqobj(id);
}

Common::SharedPtr<Object> sqobj(HSQUIRRELVM v, int i) {
	HSQOBJECT table;
	sq_getstackobj(v, i, &table);
	return sqobj(table);
}

Common::SharedPtr<Object> sqactor(HSQOBJECT table) {
	int id = getId(table);
	for (size_t i = 0; i < g_twp->_actors.size(); i++) {
		Common::SharedPtr<Object> actor = g_twp->_actors[i];
		if (actor->getId() == id)
			return actor;
	}
	return nullptr;
}

Common::SharedPtr<Object> sqactor(HSQUIRRELVM v, int i) {
	HSQOBJECT table;
	if (SQ_SUCCEEDED(sqget(v, i, table)))
		return sqactor(table);
	return nullptr;
}

Common::SharedPtr<SoundDefinition> sqsounddef(int id) {
	for (size_t i = 0; i < g_twp->_audio->_soundDefs.size(); i++) {
		Common::SharedPtr<SoundDefinition> sound = g_twp->_audio->_soundDefs[i];
		if (sound->getId() == id)
			return sound;
	}
	return nullptr;
}

Common::SharedPtr<SoundDefinition> sqsounddef(HSQUIRRELVM v, int i) {
	SQInteger id;
	if (SQ_SUCCEEDED(sqget(v, i, id)))
		return sqsounddef(id);
	return nullptr;
}

int sqparamCount(HSQUIRRELVM v, HSQOBJECT obj, const Common::String &name) {
	SQInteger top = sq_gettop(v);
	sqpush(v, obj);
	sq_pushstring(v, name.c_str(), -1);
	if (SQ_FAILED(sq_get(v, -2))) {
		sq_settop(v, top);
		debugC(kDebugGame, "can't find %s function", name.c_str());
		return 0;
	}
	SQInteger nparams, nfreevars;
	sq_getclosureinfo(v, -1, &nparams, &nfreevars);
	debugC(kDebugGame, "%s function found with %lld parameters", name.c_str(), nparams);
	sq_settop(v, top);
	return nparams;
}

void sqpushfunc(HSQUIRRELVM v, HSQOBJECT o, const char *name) {
	sq_pushobject(v, o);
	sq_pushstring(v, name, -1);
	if (SQ_FAILED(sq_get(v, -2)))
		warning("Failed to push function %s", name);
}

void sqexec(HSQUIRRELVM v, const char *code, const char *filename) {
	SQInteger top = sq_gettop(v);
	if (SQ_FAILED(sq_compilebuffer(v, code, strlen(code), filename ? filename : "twp", SQTrue))) {
		sqstd_printcallstack(v);
		return;
	}
	sq_pushroottable(v);
	if (SQ_FAILED(sq_call(v, 1, SQFalse, SQTrue))) {
		sqstd_printcallstack(v);
		sq_pop(v, 1); // removes the closure
		return;
	}
	sq_settop(v, top);
}

Common::SharedPtr<ThreadBase> sqthread(HSQUIRRELVM v, int i) {
	SQInteger id;
	if (SQ_SUCCEEDED(sqget(v, i, id)))
		return sqthread(id);
	return nullptr;
}

Common::SharedPtr<ThreadBase> sqthread(int id) {
	if (g_twp->_cutscene) {
		if (g_twp->_cutscene->getId() == id) {
			return g_twp->_cutscene;
		}
	}

	for (size_t i = 0; i < g_twp->_threads.size(); i++) {
		Common::SharedPtr<ThreadBase> t = g_twp->_threads[i];
		if (t->getId() == id) {
			return t;
		}
	}
	return nullptr;
}

Light *sqlight(int id) {
	if (!g_twp->_room)
		return nullptr;

	for (size_t i = 0; i < MAX_LIGHTS; i++) {
		Light *light = &g_twp->_room->_lights._lights[i];
		if (light->id == id) {
			return light;
		}
	}
	return nullptr;
}

Light *sqlight(HSQUIRRELVM v, int i) {
	SQInteger id;
	if (SQ_SUCCEEDED(sqget(v, i, id)))
		return sqlight(id);
	return nullptr;
}

struct GetThread {
	explicit GetThread(HSQUIRRELVM v) : _v(v) {}
	bool operator()(Common::SharedPtr<ThreadBase> t) {
		return t->getThread() == _v;
	}

private:
	HSQUIRRELVM _v;
};

Common::SharedPtr<ThreadBase> sqthread(HSQUIRRELVM v) {
	if (g_twp->_cutscene) {
		if (g_twp->_cutscene->getThread() == v) {
			return g_twp->_cutscene;
		}
	}

	auto it = Common::find_if(g_twp->_threads.begin(), g_twp->_threads.end(), GetThread(v));
	if (it != g_twp->_threads.end())
		return *it;
	return nullptr;
}

static void sqgetarray(HSQUIRRELVM v, HSQOBJECT o, Common::Array<Common::SharedPtr<SoundDefinition> > &arr) {
	sq_pushobject(v, o);
	sq_pushnull(v);
	while (SQ_SUCCEEDED(sq_next(v, -2))) {
		arr.push_back(sqsounddef(v, -1));
		sq_pop(v, 2);
	}
	sq_pop(v, 1);
}

SQRESULT sqgetarray(HSQUIRRELVM v, int i, Common::Array<Common::SharedPtr<SoundDefinition> > &arr) {
	HSQOBJECT obj;
	SQRESULT result = sq_getstackobj(v, i, &obj);
	sqgetarray(v, obj, arr);
	return result;
}

SQRESULT sqgetpairs(HSQOBJECT obj, void func(const Common::String &k, HSQOBJECT &obj, void *data), void *data) {
	HSQUIRRELVM v = g_twp->getVm();
	sq_pushobject(v, obj);
	sq_pushnull(v);
	while (SQ_SUCCEEDED(sq_next(v, -2))) {
		Common::String key;
		HSQOBJECT o;
		if (SQ_FAILED(sqget(v, -1, o)))
			return sq_throwerror(v, "failed to get object");
		if (SQ_FAILED(sqget(v, -2, key)))
			return sq_throwerror(v, "failed to get key");
		func(key, o, data);
		sq_pop(v, 2);
	}
	sq_pop(v, 2);
	return SQ_OK;
}

} // namespace Twp