(*
    BSD 2-Clause License

    Copyright (c) 2019-2020, Anton Krotov
    All rights reserved.
*)

MODULE Console;

IMPORT SYSTEM, WINAPI, In, Out;


CONST

    Black* = 0;     Blue* = 1;          Green* = 2;       Cyan* = 3;
    Red* = 4;       Magenta* = 5;       Brown* = 6;       LightGray* = 7;
    DarkGray* = 8;  LightBlue* = 9;     LightGreen* = 10; LightCyan* = 11;
    LightRed* = 12; LightMagenta* = 13; Yellow* = 14;     White* = 15;


VAR

    hConsoleOutput: INTEGER;


PROCEDURE SetCursor* (X, Y: INTEGER);
BEGIN
    WINAPI.SetConsoleCursorPosition(hConsoleOutput, X + Y * 65536)
END SetCursor;


PROCEDURE GetCursor* (VAR X, Y: INTEGER);
VAR
    ScrBufInfo: WINAPI.TConsoleScreenBufferInfo;

BEGIN
    WINAPI.GetConsoleScreenBufferInfo(hConsoleOutput, ScrBufInfo);
    X := ORD(ScrBufInfo.dwCursorPosition.X);
    Y := ORD(ScrBufInfo.dwCursorPosition.Y)
END GetCursor;


PROCEDURE Cls*;
VAR
    fill: INTEGER;
    ScrBufInfo: WINAPI.TConsoleScreenBufferInfo;

BEGIN
    WINAPI.GetConsoleScreenBufferInfo(hConsoleOutput, ScrBufInfo);
    fill := ORD(ScrBufInfo.dwSize.X) * ORD(ScrBufInfo.dwSize.Y);
    WINAPI.FillConsoleOutputCharacterA(hConsoleOutput, 20H, fill, 0, SYSTEM.ADR(fill));
    WINAPI.FillConsoleOutputAttribute(hConsoleOutput, ORD(ScrBufInfo.wAttributes), fill, 0, SYSTEM.ADR(fill));
    SetCursor(0, 0)
END Cls;


PROCEDURE SetColor* (FColor, BColor: INTEGER);
BEGIN
    IF (FColor IN {0..15}) & (BColor IN {0..15}) THEN
        WINAPI.SetConsoleTextAttribute(hConsoleOutput, LSL(BColor, 4) + FColor)
    END
END SetColor;


PROCEDURE GetCursorX* (): INTEGER;
VAR
    ScrBufInfo: WINAPI.TConsoleScreenBufferInfo;

BEGIN
    WINAPI.GetConsoleScreenBufferInfo(hConsoleOutput, ScrBufInfo)
    RETURN ORD(ScrBufInfo.dwCursorPosition.X)
END GetCursorX;


PROCEDURE GetCursorY* (): INTEGER;
VAR
    ScrBufInfo: WINAPI.TConsoleScreenBufferInfo;

BEGIN
    WINAPI.GetConsoleScreenBufferInfo(hConsoleOutput, ScrBufInfo)
    RETURN ORD(ScrBufInfo.dwCursorPosition.Y)
END GetCursorY;


PROCEDURE open*;
BEGIN
    WINAPI.AllocConsole;
    hConsoleOutput := WINAPI.GetStdHandle(-11);
    In.Open;
    Out.Open
END open;


PROCEDURE exit* (b: BOOLEAN);
BEGIN
    WINAPI.FreeConsole
END exit;


END Console.