/*!
 *
 * @file    gameBasics.cpp
 * @author  RUBINI Thomas
 * @author 	SIMAILA Djalim
 * @date    January 2022
 * @version 1.0
 * @brief   game basic mechanisms
 *
 */

#include <chrono>
#include <thread>
#include "game.h"
#include "playMode.h"

#define WININIT window("SUPER Space Invader : Turbo Apocalypse DX - VS GOD", Position(1280, 720), Position(128, 128), nsGraphics::KBlack)

Game::Game() : WININIT, pm(window) {
	if(!reloadConfig()){
		throw runtime_error("Initial config loading failed. Please check the error above and fix the configuration");
	}
	sm.readFile();
}

bool Game::areThereInvadersLeft(){
	return grid.validColsNumber() > 0;
}

void Game::handleScoreSaving(){
	for(unsigned i=0;i<players.size();++i){
		string pName;
		pm.askPlayerNameMenu(i, players[i].score, pName);
		sm.inputScore(move(pName), players[i].score);
	}
	sm.writeFile();
}

void Game::managedGames() {

	playMode = PlayMode::NONE;

	while(playMode!=PlayMode::EXIT){
		if(playMode==PlayMode::NONE){
			playMode = pm.showInitialMenu();
		}else{
			initGame();
			enterGameLoop(); // will read the playMode
			handleScoreSaving();
			cout << "END OF GAME" << endl;
			if(!pm.showDeathMenu())playMode = PlayMode::NONE;
		}
	}
}

// we assume the game has been played before, and so we need to clean used members
void Game::initGame(){
	grid = confData.grid; // will copy the grid

	// we re-construct players objects, we don't have to clear all members and can rely on the construction value (set in .h file)
	players.clear();

	missiles.clear();
	god.state = GodState::NONE;
	torpedos.clear();

	if(playMode==PlayMode::SINGLE){
		players.resize(1);
	}else{
		players.resize(2);
		// mirror the start X Position for the other
		players[1].x = pm.getScreenWidth() - confData.startXPosition - confData.playersWidth;
	}
	players[0].x = confData.startXPosition;

	for(unsigned i=0;i<players.size();++i){
		players[i].id = i;
		players[i].lives = confData.playersLives;
	}

	basePos = Position(200, 0);
	direction = true;

}

/**
 * Plays the game, and returns once the game is finished
 *
 * @return @WinValue::PLAYERS if the players won, @WinValue::INVADERS is the invaders won, WinValue::NOBODY else (also in case of error)
 */
WinValue Game::enterGameLoop(){ // returns when game is finished
	// computed in advance for performance reasons
	chrono::milliseconds maxFrameTime = chrono::milliseconds(1000/confData.maxFPS);

	unsigned tmpFps = 0;
	unsigned fps = 0;
	typedef chrono::high_resolution_clock::time_point MyTimePoint;
	MyTimePoint fpsStartTime = {};
	while(window.isOpen()){

		MyTimePoint startTime = chrono::high_resolution_clock::now();
		if(fpsStartTime.time_since_epoch()==chrono::seconds(0)){
			fpsStartTime = startTime;
		}

		pm.startFrame();

		managePlayers();
		if(manageInvaders()) { // if they went down
			if (invadersTouchPlayer())return WinValue::INVADERS;
			// TODO abstract this ?
			if (basePos.getY() > 100 /*lambda value*/ && god.state==GodState::NONE) {
				awakeGod();
			}
		}

		if(manageGod())return WinValue::PLAYERS;
		if(arePlayersDead())return WinValue::GOD;

		moveMissiles();
		remCollidingProjectiles();
		moveTorpedos();
		remCollidingProjectiles();

		checkMissilesAndPlayers();
		if(checkTorpedosAndInvaders())return WinValue::PLAYERS;

		if(arePlayersDead())return WinValue::INVADERS;

		displayAll();

		pm.endFrame();

		MyTimePoint endTime = chrono::high_resolution_clock::now();

		// This code is counted as part of frames, but that's not really something we can control
		if(fpsStartTime+chrono::seconds(1) < endTime){
			fps = tmpFps;
			tmpFps = 0;
			fpsStartTime = {};
		}else ++tmpFps;

		this_thread::sleep_until(startTime+maxFrameTime);
	}

	return WinValue::NOBODY;
}

Position Game::invIndexToPos(unsigned x, unsigned y) const {
	return basePos+Position(INV_GET_POS(x), INV_GET_POS(y));
}

bool Game::arePlayersDead() {
	return all_of(players.begin(), players.end(), [](Player& p) -> bool {return p.isEliminated();});
}