// Event loop handler
// Copyright (C) 2002  David Rosen
// Copyright (C) 2003  Zachary Jack Slater
// Copyright (C) 2003  Steven Fuller
// Copyright (C) 2021  Nguyễn Gia Phong
//
// This file is part of Black Shades.
//
// Black Shades 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.
//
// Black Shades 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 Black Shades.  If not, see <https://www.gnu.org/licenses/>.

#include "GLFW/glfw3.h"

#include "Game.h"

extern float multiplier;
extern int visions;
extern unsigned int gSourceID[100];
extern unsigned int gSampleSet[100];
extern Camera camera;
extern float rad2deg;
extern Fog fog;
extern int environment;
extern int slomo;

void Game::HandleKeyDown(char key)
{
	if (mainmenu)
		return;

	ALfloat pitch;
	XYZ facing;

	switch(key) {
	case 'l':
		lasersight ^= 1;
		break;
	case 'k':
		if (debug)
			timeremaining = 0;
		break;
	case 'b':
		if (!debug)
			break;
		alSourcePlay(gSourceID[soulinsound]);
		pitch = (slomo ^= 1) ? 0.5f : 1.0f;
		alSourcef(gSourceID[knifesong], AL_PITCH, pitch);
		alSourcef(gSourceID[shootsong], AL_PITCH, pitch);
		alSourcef(gSourceID[zombiesong], AL_PITCH, pitch);
		break;
	case 'B':
		if (!debug)
			break;
		alSourcePlay(gSourceID[soulinsound]);
		paused = 1 - paused;
		break;
	case 'f':
		if (!debug)
			break;
		alSourcePlay(gSourceID[souloutsound]);

		facing = 0;
		facing.z = -1;
		facing = DoRotation(facing, -camera.rotation2, 0, 0);
		facing = DoRotation(facing, 0, 0 - camera.rotation, 0);

		for(int i = 1; i < numpeople; i++) {
			if (person[i].skeleton.free == 1
			    || findDistancefast(person[i].playercoords,
			                        person[0].playercoords) > 1000)
				continue;
			person[i].skeleton.free = 1;
			person[i].longdead = 1;

			for (auto& joint : person[i].skeleton.joints) {
				joint.position = DoRotation(joint.position, 0, person[i].playerrotation, 0);
				joint.position += person[i].playercoords;
				joint.realoldposition = joint.position;
				joint.velocity = DoRotation(joint.velocity, 0, person[i].playerrotation, 0);
				joint.velocity += person[i].velocity;
				joint.velocity += facing * 50;
				joint.velocity.x += abs(Random() % 20) - 10;
				joint.velocity.y += abs(Random() % 20) - 10;
				joint.velocity.z += abs(Random() % 20) - 10;
			}
		}
		break;
	case 'X':
		if (!debug || person[0].grenphase)
			break;
		person[0].ammo = -1;
		person[0].whichgun++;
		person[0].grenphase = 0;
		person[0].reloads[person[0].whichgun] = 3;
		if (person[0].whichgun > 7)
			person[0].whichgun = 0;
		break;
	}
}

void eventLoop(Game* game)
{
	/*
	 * SDL_Event event;
	 * while (SDL_PollEvent(&event)) {
	 * 	if (event.type == SDL_KEYUP
	 * 	    && event.key.keysym.unicode
	 * 	    && !(event.key.keysym.unicode & 0xFF80))
	 * 		game->HandleKeyDown(event.key.keysym.unicode);
	 * }
	 */

	auto start = glfwGetTime();
	GLfloat oldmult = multiplier;
	int colaccuracy = min(game->sps,
		game->sps / game->framespersecond + 1.0f);
	multiplier /= colaccuracy;
	for (int i = 0; i < (int) (colaccuracy + 0.5f); i++)
		game->Tick();
	auto window = glfwGetCurrentContext();
	if (game->DrawGLScene())
		glfwSwapBuffers(window);
	else
		glfwSetWindowShouldClose(window, GLFW_TRUE);
	multiplier = oldmult;

	do game->framespersecond = 1.0 / (glfwGetTime() - start);
	while (game->framespersecond > game->maxfps);

	game->multiplier5 = game->multiplier4;
	game->multiplier4 = game->multiplier3;
	game->multiplier3 = game->multiplier2;
	game->multiplier2 = 1 / game->framespersecond;
	multiplier = (game->multiplier2 + game->multiplier3
		+ game->multiplier4 + game->multiplier5) / 4.0f;
	multiplier = min(max(multiplier, 0.00001f), 1.0f);
	if (visions == 1 && !game->mainmenu)
		multiplier /= 3;
	if (slomo)
		multiplier /= 5;
	if (game->paused)
		multiplier = 0;

	if (IsKeyDown(GLFW_KEY_ESCAPE)) {
		alSourcePause(gSourceID[rainsound]);
		game->mainmenu = 1;
		alSourcePlay(gSourceID[souloutsound]);
		game->flashamount = 1.0f;
		game->flashr = game->flashg = game->flashb = 1.0f;
		alSourceStop(gSourceID[visionsound]);
		game->whichsong = mainmenusong;
		alSourceStop(gSourceID[knifesong]);
		alSourceStop(gSourceID[shootsong]);
		alSourceStop(gSourceID[zombiesong]);
		alSourceStop(gSourceID[mainmenusong]);
		alSourcef(gSourceID[knifesong], AL_MIN_GAIN, 0);
		alSourcef(gSourceID[shootsong], AL_MIN_GAIN, 0);
		alSourcef(gSourceID[zombiesong], AL_MIN_GAIN, 0);
		alSourcef(gSourceID[mainmenusong], AL_MIN_GAIN, 0);
		alSourcePlay(gSourceID[game->whichsong]);
		alSourcef(gSourceID[game->whichsong], AL_MIN_GAIN, 1);
	}
}