#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
        Position 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::shared_ptr<PiecesList>& piecesList, int nextQueueLength);

        /**
         * Resets the board as if it was newly created
         */
        void reset();

    private:
        /**
         * Initializes the board
         */
        void initialize();

    public:
        /**
         * Tries moving the piece one position to the left
         * @return If it suceeded
         */
        bool moveLeft();

        /**
         * Tries moving the piece one position to the right
         * @return If it suceeded
         */
        bool moveRight();

        /**
         * Tries moving the piece one position down
         * @return If it suceeded
         */
        bool moveDown();

        /**
         * Tries rotating the piece and kicking it if necessary
         * @return If it suceeded
         */
        bool rotate(Rotation rotation);
    
    private:
        /**
         * Tries kicking the piece, testing position either above or below the piece's initial position
         * @return If it suceeded
         */
        bool tryKicking(bool testingBottom, const std::set<Position>& safePositions);

    public:
        /**
         * Tries holding the active piece or swapping it if one was already stocked, while trying to apply an initial rotation to the newly spawned piece
         * @return If it suceeded
         */
        bool hold(Rotation initialRotation = NONE);

        /**
         * Spawns the next piece from the queue
         * @return If it spawned in a wall
         */
        bool spawnNextPiece();

        /**
         * Checks is the active piece as a wall directly below one of its position
         * @return If it touches a ground
         */
        bool touchesGround();

        /**
         * Locks the active piece into the board and clears lines if needed
         * @return The resulting line clear
         */
        LineClear lockPiece();

        /**
         * Adds a specified number of garbage rows to the bottom of the board, the hole position being random but the same for all of them
         */
        void addGarbageRows(int number);

        /**
         * @return A copy of the board
         */
        Board getBoard() const;

        /**
         * @return A copy of the active piece
         */
        Piece getActivePiece() const;

        /**
         * @return A copy of the position of the active piece
         */
        Position getActivePiecePosition() const;

        /**
         * @return A copy of the held piece
         */
        Piece getHeldPiece() const;

        /**
         * @return A copy of the next piece queue
         */
        std::vector<Piece> getNextPieces() const;
    
    private:
        /**
         * Checks if one of the active piece's positions touches a wall in the board
         * @return If the active piece is in a wall
         */
        bool isActivePieceInWall(const Position& shift = Position{0, 0}) const;

        /**
         * Check if one of the active piece's positions shifted by a specified position would overlap with a set of positions
         * @return If the shifted active piece overlaps with one of the position
         */
        bool activePieceOverlapsOnePosition(const std::set<Position>& safePositions, const Position& shift = Position{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
         * @return A reference to the output stream
         */
        friend std::ostream& operator<<(std::ostream& os, const GameBoard& gameboard);
};