#pragma once

#include "../Pieces/Piece.h"
#include "Board.h"
#include "Bag.h"
#include "LineClear.h"

#include <Vector>
#include <memory>


/**
 * Links a board with the pieces moving in it
 */
class GameBoard {
    private:
        Board board; // the board in which pieces moves, (0, 0) is downleft
        Bag generator; // the piece generator
        std::shared_ptr<Piece> activePiece; // the piece currently in the board
        Cell activePiecePosition; // the position of the piece currently in the board
        std::shared_ptr<Piece> heldPiece; // a piece being holded
        int nextQueueLength; // the number of next pieces seeable at a time
        std::vector<Piece> nextQueue; // the list of the next pieces to spawn in the board
        bool isLastMoveKick; // wheter the last action the piece did was kicking
    
    public:
        /**
         * Creates a new board, generator, and next queue
         */
        GameBoard(int boardWidth, int boardHeight, const std::vector<Piece>& bag, int nextQueueLength);

        /**
         * Try moving the piece one cell to the left, and returns wheter it was sucessfull
         */
        bool moveLeft();

        /**
         * Try moving the piece one cell to the right, and returns wheter it was sucessfull
         */
        bool moveRight();

        /**
         * Try moving the piece one cell down, and returns wheter it was sucessfull
         */
        bool moveDown();

        /**
         * Try rotating the piece and kicking it if necessary, and returns wheter it was sucessfull
         */
        bool rotate(Rotation rotation);
    
    private:
        /**
         * Try kicking the piece, testing position either above or below the piece's initial position
         */
        bool tryKicking(bool testingBottom, const std::set<Cell>& safeCells);

    public:
        /**
         * Try holding the active piece or swapping it if one was already stocked, while trying to apply an initial rotation to the newly spawned piece,
         * and returns wheter it was sucessfull
         */
        bool hold(Rotation initialRotation = NONE);

        /**
         * Spawns the next piece from the queue, and returns wheter it spawns in a wall
         */
        bool spawnNextPiece();

        /**
         * Returns wheter the active piece is touching walls directly below it
         */
        bool touchesGround();

        /**
         * Lock the active piece into the board and returns the resulting line clear
         */
        LineClear lockPiece();

        /**
         * Returns a copy of the board
         */
        Board getBoard() const;

        /**
         * Returns a copy of the active piece
         */
        Piece getActivePiece() const;

        /**
         * Returns a copy of the position of the active piece
         */
        Cell getActivePiecePosition() const;

        /**
         * Returns a copy of the held piece
         */
        Piece getHeldPiece() const;

        /**
         * Returns a copy of the next piece queue
         */
        std::vector<Piece> getNextPieces() const;
    
    private:
        /**
         * Returns wheter the translated active piece is in a wall
         */
        bool isActivePieceInWall(const Cell& shift = Cell{0, 0}) const;

        /**
         * Returns wheter the translated active piece overlaps with at least one of the cells
         */
        bool activePieceOverlapsOneCell(const std::set<Cell>& safeCells, const Cell& shift = Cell{0, 0}) const;
        
        /**
         * Sets the active piece to its spawn position
         */
        void goToSpawnPosition();
    
    public:
        /**
         * Stream output operator, adds the board, the hold box and the next queue
         */
        friend std::ostream& operator<<(std::ostream& os, const GameBoard& gameboard);
};