#include <iostream>
#include <vector>
#include <stdlib.h>
#include <stdio.h>
#include "Engine.h"


Engine::Engine(){
	Board* brd = new Board();
	b = brd;
}

void Engine::startGame(){
	cout<<"WELCOME\n";
	
	cout<<"1. Play against AI?\n";
	cout<<"2. Play against a human?\n";
	cout<<"Enter choice: \n";

	int choice = -1;
	cin >> choice;
	cout << "OK" << endl;

	string move;

	bool gameOver = false; 
	vector<Board> record;
	b->snapshot(record, *b);

	while (gameOver != true)
	{
		gameOver = b->isGameOver();
		
		while(b->getTurn() == 'O' )
		{
			b->displayBoard();
			cout<<"\nEnter command: ";
			cin>>move;
			cout << "\n";
			b->interpret(move, *b);
			b->changeTurns();
		}
		
		while(b->getTurn() == 'X' )
		{
			AI();
		}
		
		gameOver = b->isGameOver();
		
		b->snapshot(record, *b);
	}
}

void Engine::easyAI()
{
	vector<moves> listOfMoves = b->viewPossibleMoves();
	
	srand(time(NULL));
	int randomChoice = rand() % (listOfMoves.size()-1) - 0;
	
	int temp = randomChoice;
	b->move(listOfMoves[randomChoice]);
	b->changeTurns();
}

void Engine::AI(){
	cout << "----------------------BEGIN AI FUNCTION----------------------\n";
	vector<moves> listOfMoves = b->viewPossibleMoves();
	Board* temp = new Board(*b);
	
	//probably not needed, check later
	if (temp->getTurn() != 'X'){
		cout << "a changing of turns is needed. \n";
		temp->changeTurns();
	}

	//only doing 1 branch right now because testing
	/*for (int i = 0; i < listOfMoves.size(); ++i){
		minMax(temp, listOfMoves[i]);
	}*/
	
	b->move(minMax(temp, listOfMoves[0], 0));
	b->changeTurns();
	
	//verification of correct turn
	if (b->getTurn() != 'O'){
		cout << "ERROR in Engine::AI: b is on the wrong turn. \n";
	}
	
	b->displayBoard();
	cout << "----------------------END AI FUNCTION----------------------\n";
}

moves Engine::minMax(Board* temp, moves m, int c){
	//testing purposes only
	if (c > 5){		
		return m;
	}
	
	if (temp->isGameOver() == true){
		cout << "END OF PATH REACHED\n";
		return m;
	}

	else {
		if(temp->isThisMovePossible(8 - m.row, temp->charToIntColumn(m.column), m.moveType)){
			cout << "piece has been moved in minMax\n";
			temp->move(m);
			temp->changeTurns();
		}
		cout << "c: " << c << "\n\n";
		cout << "current turn: " << temp->getTurn() << "\n";
		vector<moves> listOfMoves = temp->viewPossibleMoves();
		
		for (int i = 0; i < listOfMoves.size(); ++i){
			//return minMax(temp, listOfMoves[i]);
		}
		
		temp->displayBoard();
		//limited recursion
		return minMax(temp, listOfMoves[0], ++c);
		
		//testing
		return m;
	}
}