unit keys_m;

interface

uses game_m, level_m;

const
    ArrowDownOrd = -80;
    ArrowLeftOrd = -75;
    ArrowRightOrd = -77;
    ArrowUpOrd = -72;

    CtrlCOrd = 3;
    CtrlZOrd = 26;

    EscOrd = 27;
    EnterOrd = 13;
    LowerNOrd = 110;
    LowerYOrd = 121;
    SpaceOrd = 32;
    UpperNOrd = 78;
    UpperYOrd = 89;

    OneOrd = 49;
    TwoOrd = 50;
    ThreeOrd = 51;
    UpperQOrd = 81;
    LowerQOrd = 113;

    { Debug }
    BOrd = 98;
    COrd = 99;
    LOrd = 108;
    { Debug }

procedure HandleKey(var g: gameState; var level: levelState);

implementation

uses crt, graphics_m, trace_m, creature_m, debug_m;

procedure GetKey(var keyCode: integer);
var
    c: char;
begin
    c := ReadKey;
    if c = #0 then
    begin
        c := ReadKey;
        keyCode := -ord(c)
    end
    else
    begin
        keyCode := ord(c)
    end
end;

procedure ChangeHamsterDelta(var h: creature; k: integer);
begin
    h.dX := 0;
    h.dY := 0;
    case k of
        ArrowLeftOrd:
            h.dX := -h.movespeed;
        ArrowRightOrd:
            h.dX := h.movespeed;
        ArrowUpOrd:
            h.dY := -h.movespeed;
        ArrowDownOrd:
            h.dY := h.movespeed;
        SpaceOrd:
            StopCreature(h)
    end
end;

procedure HandleLevelKey(var g: gameState; var level: levelState; k: integer);
begin
    {DEBUG}
    if k = BOrd then
        Print(level.a.borders);
    if k = COrd then
        Print(level.a.captured);
    if k = LOrd then
    begin
        GotoXY(2, 60);
        write('    ');
        GotoXY(2, 60);
        writeln(GetLength(level.t));
        GotoXY(1, 1)
    end;
    {DEBUG}
    if (k = ArrowLeftOrd) or (k = ArrowRightOrd) or (k = ArrowUpOrd) or
        (k = ArrowDownOrd) or (k = SpaceOrd) then
    begin
        ChangeHamsterDelta(level.h, k)
    end;
    if k = EscOrd then
        g.curState := gamePause
end;

procedure PreviousMenuState(var g: gameState);
begin
    if (g.curMenu = menuNewGame) and not g.levelInited then
        g.curMenu := menuKeyInfo
    else
    if g.curMenu = menuNewGame then
        g.curMenu := menuContinue
    else
        g.curMenu := pred(g.curMenu)
end;

procedure NextMenuState(var g: gameState);
begin
    if (g.curMenu = menuKeyInfo) and not g.levelInited or
        (g.curMenu = menuContinue) then
    begin
        g.curMenu := menuNewGame
    end
    else
    begin
        g.curMenu := succ(g.curMenu)
    end
end;

procedure ChangeMenuState(var g: gameState; k: integer);
begin
    case k of
        ArrowUpOrd:
            PreviousMenuState(g);
        ArrowDownOrd:
            NextMenuState(g)
    end
end;

procedure ChooseMenuNum(var g: gameState; k: integer);
begin
    if (k = ThreeOrd) and not g.levelInited then
        exit;
    case k of
        OneOrd: begin
            g.newGame := true;
            g.level := 1;
            g.curState := gameLevelAnnounce
        end;
        TwoOrd:
            g.curState := gameKeyInfo;
        ThreeOrd:
            g.curState := gameContinueLevel
    end
end;

procedure ChooseMenuMarked(var g: gameState);
begin
    case g.curMenu of
        menuNewGame:
        begin
            g.newGame := true;
            g.level := 1;
            g.curState := gameLevelAnnounce
        end;
        menuKeyInfo:
            g.curState := gameKeyInfo;
        menuContinue:
            g.curState := gameContinueLevel
    end
end;

procedure HandleMenuKey(var g: gameState; k: integer);
begin
    if (k = ArrowUpOrd) or (k = ArrowDownOrd) then
    begin
        EraseMenuState(g.curMenu);
        ChangeMenuState(g, k);
        DrawMenuState(g.curMenu)
    end;
    if (k = OneOrd) or (k = TwoOrd) or (k = ThreeOrd) then
        ChooseMenuNum(g, k);
    if (k = EscOrd) or (k = UpperQOrd) or (k = LowerQOrd) then
        g.curState := gameExit;
    if (k = EnterOrd) or (k = SpaceOrd) then
        ChooseMenuMarked(g)
end;

procedure HandleGameOverKey(var g: gameState; k: integer);
begin
    case k of
        UpperYOrd, LowerYOrd:
            g.curState := gameLevelAnnounce;
        UpperNOrd, LowerNOrd:
            g.curState := gameMenu;
    end
end;

procedure ChangeExitState(k: integer; var g: gameState);
begin
    case k of
        ArrowRightOrd:
            NextExitState(g);
        ArrowLeftOrd:
            PreviousExitState(g)
    end
end;

procedure HandleExitKey(var g: gameState; k: integer);
begin
    if (k = ArrowLeftOrd) or (k = ArrowRightOrd) then
    begin
        EraseExitState(g.curExit);
        ChangeExitState(k, g);
        DrawExitState(g.curExit);
        exit
    end;
    if (k = EnterOrd) or (k = SpaceOrd) then
    begin
        if g.curExit then
            g.shutdown := true
        else
            g.curExit := true;
    end;
    if (k = UpperYOrd) or (k = LowerYOrd) or (k = OneOrd) then
        g.shutdown := true;
    if (k = UpperNOrd) or (k = LowerNOrd) or (k = EscOrd) or (k = TwoOrd) then
        g.curExit := true;
    g.curState := gameMenu
end;

procedure HandlePauseKey(var g: gameState; k: integer);
begin
    if (k = EscOrd) or (k = SpaceOrd) then
        g.curState := gameUnpauseLevel;
    if (k = UpperQOrd) or (k = LowerQOrd) then
        g.curState := gameMenu
end;

procedure HandleInfoKey(var g: gameState; k: integer);
begin
    if (k = EscOrd) or (k = SpaceOrd) or (k = EnterOrd) or
        (k = UpperQOrd) or (k = LowerQOrd) then
    begin
        g.curState := gameMenu
    end
end;

procedure HandleSceneKey(var g: gameState; k: integer);
begin
    if (k = EscOrd) or (k = SpaceOrd) or (k = EnterOrd) then
        g.skipScene := true
end;

procedure HandleGameCompleteKey(var g: gameState; k: integer);
begin
    if (k = EscOrd) or (k = SpaceOrd) or (k = EnterOrd) then
        g.curState := gameMenu
end;

procedure HandleKey(var g: gameState; var level: levelState);
var
    k: integer;
begin
    GetKey(k);
    if (k = CtrlCOrd) or (k = CtrlZOrd) then
    begin
        g.shutdown := true;
        exit    
    end;
    case g.curState of
        gameLevelComplete, gameLevelAnnounce:
            HandleSceneKey(g, k);
        gameLevelLoop:
            HandleLevelKey(g, level, k);
        gameExit:
            HandleExitKey(g, k);
        gameMenu:
            HandleMenuKey(g, k);
        gameKeyInfo:
            HandleInfoKey(g, k);
        gamePause:
            HandlePauseKey(g, k);
        gameOver:
            HandleGameOverKey(g, k);
        gameComplete:
            HandleGameCompleteKey(g, k)
    end
end;

end.