unit graphics_m;

interface

uses arena_m, creature_m, trace_m, game_m, level_m, _banners_m, ascii_arts_m;

const
    BorderSize = 1;
    InterfaceH = 6;
    WidthCoefficient = 2;
    CellSize = 2;
    BorderSymbol = '|';
    DigitSpaceWidth = 1;
    ScreenH = (ArenaH + InterfaceH) * CellSize + BorderSize;
    ScreenW = (ArenaW - 1) * CellSize + BorderSize * 2; { 82 }

procedure DrawAnnounce(lvl: integer);
procedure DrawBannerImage(x, y, h: integer; var a: BannerImage);
procedure DrawCreatureImage(x, y, h: integer; var a: CreatureImage);
procedure DrawExitState(b: boolean);
procedure DrawExit(var g: gameState);
procedure DrawGameOver;
procedure DrawGameComplete(score: integer);
procedure DrawKeyInfo;
procedure DrawLineX(x, y, len: integer; ch: char);
procedure DrawLineY(x, y, len: integer; ch: char);
procedure DrawNumber(x, y: integer; n: longint);
procedure DrawRectangle(x0, y0, h, w: integer; ch: char);
procedure DrawMenuState(s: menuState);
procedure DrawMenu(var g: gameState);
procedure EraseAll;
procedure EraseAnnounce(lvl: integer);
procedure EraseExit;
procedure EraseExitState(b: boolean);
procedure EraseGameOver;
procedure EraseKeyInfo;
procedure EraseLevel;
procedure EraseMenu;
procedure EraseMenuState(s: menuState);
procedure EraseRectangle(x, y, w, h: integer);
procedure FillRectangle(x, y, w, h: integer; ch: char);

implementation

uses crt, math_m;

const
    AnnounceY = (ScreenH - LevelAnnounceHeight) div 2;
    BigLetterWidth = 8;
    BorderN = 2;
    DecimalDelimiter = 10;
    GameNameY = 16;
    NameHeightPadding = 8;
    NewGameY = GameNameY + GameNameHeight + NameHeightPadding;
    MenuHeightPadding = 2;
    MenuInfoY = NewGameY + NewGameHeight + MenuHeightPadding;
    ContinueY =  MenuInfoY + MenuInfoHeight;
    ExitGameY = (ScreenH - ExitScreenHeight) div 2  - MenuHeightPadding;
    ExitYesY = ExitGameY + ExitHeight - 1 + MenuHeightPadding;
    ExitHamsterY = ExitYesY;
    GameNameX = ScreenW * WidthCoefficient div 3 + 4;
    MenuWidthPadding = 4;
    MenuHamsterX = GameNameX - HamsterWidth - MenuWidthPadding;
    ExitYesX = MenuHamsterX;
    ExitNoX = ScreenW  * WidthCoefficient - ExitYesX - NoWidth;
    GameOverX = (ScreenW * WidthCoefficient - GameNameWidth) div 2;
    GameOverY = (ScreenH - GameOverHeight) div 2;
    HamsterNoX = ExitNoX - HamsterWidth - MenuWidthPadding;
    HamsterYesX = ExitYesX - HamsterWidth - MenuWidthPadding;
    KeyInfoX = (ScreenW * WidthCoefficient - KeyInfoWidth) div 2;
    KeyInfoY = (ScreenH - KeyInfoHeight) div 2;
    LetterWidth = 5;
    LevelNumberMargin = 3;
    GameCompleteX = (ScreenW * WidthCoefficient - GameCompleteWidth) div 2;
    GameCompleteY = (ScreenH - GameCompleteHeight) div 2;
    GameCompleteScoreX = GameCompleteX + GameCompleteScoreWidth + 3;
    GameCompleteScoreY = GameCompleteY + 9;
    EndOfLine = 256;

var
    firstMenuDraw: boolean = true;

procedure PrintStringScreen(x, y, dy: integer; var s: string);
var
    cutLen: integer;
    sCopy: string;
begin
    if y + dy - 1 > ScreenH then
        exit;
    if x < 0 then
    begin
        cutLen := x * -1 + 1;
        GotoXY(1, y + dy - 1);
        sCopy := copy(s, cutLen, EndOfLine);
        write(sCopy)
    end
    else
    begin
        GotoXY(x, y + dy - 1);
        write(s)
    end;
    GotoXY(1, 1)
end;

procedure DrawCreatureImage(x, y, h: integer; var a: CreatureImage);
var
    i: integer;
begin
    for i := 1 to h do
        PrintStringScreen(x, y, i, a[i])
end;

procedure DrawBannerImage(x, y, h: integer; var a: BannerImage);
var
    i: integer;
begin
    for i := 1 to h do
        PrintStringScreen(x, y, i, a[i])
end;

procedure DrawDigitImage(x, y, h: integer; var a: DigitImage);
var
    i: integer;
begin
    for i := 1 to h do
        PrintStringScreen(x, y, i, a[i])
end;

procedure DrawDigit(x, y, digit: integer);
begin
    DrawDigitImage(x, y, DigitHeight, DigitsAscii[digit])
end;

procedure DrawExitState(b: boolean);
begin
    if b then
        DrawCreatureImage(HamsterYesX, ExitHamsterY,
                     HamsterHeight, HamsterGGAscii)
    else
        DrawCreatureImage(HamsterNoX, ExitHamsterY,
                     HamsterHeight, HamsterStayAscii)
end;

procedure DrawExit(var g: gameState);
var
    realX: integer = ScreenW  * WidthCoefficient;
begin
    DrawBannerImage((realX - ExitWidth) div 2, ExitGameY,
                    ExitScreenHeight, ExitScreen);
    DrawExitState(g.curExit)
end;

procedure DrawGameOver;
begin
    DrawBannerImage(GameOverX, GameOverY, GameOverHeight, GameOverScreen)
end;

procedure DrawKeyInfo;
begin
    DrawBannerImage(KeyInfoX, KeyInfoY, KeyInfoHeight, KeyInfoScreen)
end;

procedure DrawLineX(x, y, len: integer; ch: char);
var
    i: integer;
begin
    GotoXY(x, y);
    for i := 1 to len do
        write(ch);
    GotoXY(1, 1)
end;

procedure DrawLineY(x, y, len: integer; ch: char);
var
    i: integer;
begin
    for i := 1 to len do
    begin
        GotoXY(x, y + i - 1);
        write(ch)
    end;
    GotoXY(1, 1)
end;

procedure DrawMenuState(s: menuState);
begin
    case s of
        menuNewGame:
            DrawCreatureImage(MenuHamsterX, NewGameY + 1,
                              HamsterHeight, HamsterStayAscii);
        menuKeyInfo:
            DrawCreatureImage(MenuHamsterX, MenuInfoY + 1,
                              HamsterHeight, HamsterStayAscii);
        menuContinue:
            DrawCreatureImage(MenuHamsterX, ContinueY + 1,
                              HamsterHeight, HamsterStayAscii)
    end
end;

procedure DrawRectangle(x0, y0, h, w: integer; ch: char);
var
    i: integer;
begin
    DrawLineX(x0, y0, w, ch);
    for i := 1 to h - 2 do
    begin
        GotoXY(x0, y0 + i);
        write(ch);
        GotoXY(x0 + w - 1, y0 + i);
        write(ch)
    end;
    DrawLineX(x0, y0 + h - 1, w, ch);
    GotoXY(1, 1)
end;

procedure DrawMenu(var g: gameState);
var
    y: integer = GameNameY;
begin
    if firstMenuDraw then { REFACTOR LATER }
    begin
        DrawRectangle(1, 1, ScreenH, ScreenW * WidthCoefficient, BorderSymbol);
        firstMenuDraw := not firstMenuDraw
    end;
    DrawBannerImage(GameNameX, y, GameMenuHeight, GameMenuScreen);
    if not g.levelInited then
        DrawLineX(GameNameX, ContinueY + ContinueHeight div 2,
                  ContinueWidth, '-');
    DrawMenuState(g.curMenu)
end;

procedure FillRectangle(x, y, w, h: integer; ch: char);
var
    i, j: integer;
begin
    for i := 0 to h - 1 do
    begin
        GotoXY(x, y + i);
        for j := 0 to w - 1 do
            write(ch)
    end;
    GotoXY(1, 1)
end;

procedure EraseRectangle(x, y, w, h: integer);
begin
    FillRectangle(x, y, w, h, ' ')
end;

procedure EraseAll;
begin
    EraseRectangle(1, 1, ScreenW * WidthCoefficient, ScreenH)
end;

procedure EraseExit;
begin
    EraseRectangle(HamsterYesX, ExitGameY,
                   ExitWidth + HamsterWidth + MenuWidthPadding,
                   ExitScreenHeight + MenuHeightPadding + YesHeight)
end;

procedure EraseExitState(b: boolean);
begin
    if b then
        EraseRectangle(HamsterYesX, ExitHamsterY,
                       HamsterWidth, HamsterHeight)
    else
        EraseRectangle(HamsterNoX, ExitHamsterY,
                       HamsterWidth, HamsterHeight)
end;

procedure EraseGameOver;
begin
    EraseRectangle(GameOverX, GameOverY, GameOverWidth, GameOverHeight)
end;

procedure EraseKeyInfo;
begin
    EraseRectangle(KeyInfoX, KeyInfoY, KeyInfoWidth, KeyInfoHeight)
end;

procedure EraseLevel;
begin
    EraseRectangle(2, 2,
                   ScreenW * WidthCoefficient - BorderSize * BorderN,
                   ScreenH - BorderSize * BorderN);
    DrawRectangle(1, 1, ScreenH, ScreenW * WidthCoefficient, BorderSymbol)
end;

procedure EraseMenu;
begin
    EraseRectangle(MenuHamsterX, GameNameY,
                  GameNameWidth + HamsterWidth + MenuWidthPadding,
                  ScreenH - GameNameY * 2)
end;

procedure EraseMenuState(s: menuState);
begin
    case s of
        menuNewGame:
            EraseRectangle(MenuHamsterX, NewGameY + 1,
                           HamsterWidth, HamsterHeight);
        menuKeyInfo:
            EraseRectangle(MenuHamsterX, MenuInfoY + 1,
                           HamsterWidth, HamsterHeight);
        menuContinue:
            EraseRectangle(MenuHamsterX, ContinueY + 1,
                           HamsterWidth, HamsterHeight)
        end
end;

type
    stackIntPtr = ^stackIntItem;

    stackIntItem = record
        val: integer;
        next: stackIntPtr
    end;

    StackInt = record
        top: stackIntPtr
    end;

procedure StackIntInit(var s: StackInt);
begin
    s.top := nil
end;

procedure StackPush(var st: StackInt; val: integer);
var
    tmp: stackIntPtr;
begin
    new(tmp);
    tmp^.val := val;
    tmp^.next := st.top;
    st.top := tmp
end;

procedure StackPop(var st: StackInt);
var
    tmp: stackIntPtr;
begin
    tmp := st.top;
    st.top := st.top^.next;
    dispose(tmp)
end;

procedure DrawNumber(x, y: integer; n: longint);
var
    i: integer = 0;
    st: StackInt;
begin
    StackIntInit(st);
    if n = 0 then
        StackPush(st, 0);
    while n <> 0 do
    begin
        StackPush(st, n mod DecimalDelimiter);
        n := n div DecimalDelimiter
    end;

    while st.top <> nil do
    begin
        DrawDigit(x + (DigitWidth + DigitSpaceWidth) * i, y, st.top^.val);
        StackPop(st);
        i := i + 1
    end
end;

function CountDigits(l: integer): integer;
var
    lvl: integer;
    res: integer = 0;
begin
    lvl := l;
    while lvl <> 0 do
    begin
        res := res + 1;
        lvl := lvl div DecimalDelimiter
    end;
    CountDigits := res
end;

procedure DrawAnnounce(lvl: integer);
var
    w, x: integer;
    digitCnt: integer = 0;
begin
    digitCnt := CountDigits(lvl);
    w := LevelAnnounceWidth + LevelNumberMargin +
        DigitWidth * digitCnt + DigitSpaceWidth * (digitCnt - 1);
    x := (ScreenW * WidthCoefficient - w) div 2;
    DrawBannerImage(x, AnnounceY, LevelAnnounceHeight, LevelAnnounce);
    DrawNumber(x + LevelAnnounceWidth + LevelNumberMargin, AnnounceY + 1, lvl)

end;

procedure EraseAnnounce(lvl: integer);
var
    w, x, digitCnt: integer;
begin
    digitCnt := CountDigits(lvl);
    w := LevelAnnounceWidth + LevelNumberMargin +
        DigitWidth * digitCnt + DigitSpaceWidth * (digitCnt - 1);
    x := (ScreenW * WidthCoefficient - w) div 2;
    EraseRectangle(x, AnnounceY, w, LevelAnnounceHeight)
end;

procedure DrawGameComplete(score: integer);
begin
    DrawBannerImage(GameCompleteX, GameCompleteY,
                    GameCompleteHeight, GameComplete);
    DrawNumber(GameCompleteScoreX, GameCompleteScoreY, score)
end;

end.