_kh.bf_calcDistance = function(x1, y1, x2, y2)
    return math.max(math.abs(x2 - x1), math.abs(y2 - y1));
end;

_kh.bf_calcDirection = function(x1, y1, x2, y2)
    -- 0 - close by, 1-8 - north to north-west clockwise, 9 - too far
    local dist = _kh.bf_calcDistance(x1,y1,x2,y2);
    if (dist == 0) then
        return 0;
    elseif (dist == 1) then
        if (x1 == x2 and y1 > y2) then
            return 1;
        elseif (x1 < x2 and y1 > y2) then
            return 2;
        elseif (x1 < x2 and y1 == y2) then
            return 3;
        elseif (x1 < x2 and y1 < y2) then
            return 4;
        elseif (x1 == x2 and y1 < y2) then
            return 5;
        elseif (x1 > x2 and y1 < y2) then
            return 6;
        elseif (x1 > x2 and y1 == y2) then
            return 7;
        elseif (x1 > x2 and y1 > y2) then
            return 8;
        end;
    else
        return 9;
    end;
end;

battlefield = function(tab)
    local make_turn = tab.make_turn;
    tab.check_walk = function(s)
        bf_north:enable();
        bf_northeast:enable();
        bf_east:enable();
        bf_southeast:enable();
        bf_south:enable();
        bf_southwest:enable();
        bf_west:enable();
        bf_northwest:enable();
        
        if (s.plY == 1) then
            bf_north:disable();
            bf_northeast:disable();
            bf_northwest:disable();
        elseif (s.plY == 5) then
            bf_south:disable();
            bf_southeast:disable();
            bf_southwest:disable();
        end;
        
        if (s.plX == 1) then
            bf_west:disable();
            bf_southwest:disable();
            bf_northwest:disable();
        elseif (s.plX == 5) then
            bf_east:disable();
            bf_southeast:disable();
            bf_northeast:disable();
        end;
    end;
    
    local entered = tab.entered;
    
    tab.entered = function(s)
        s:check_walk();
        if (type(entered) == 'function') then
            entered(s);
        else
            return entered;
        end;
    end;
    
    tab.make_turn = function(s)
        for i = 1, #s.obj do
            if (type(s.obj[i].make_turn) == 'function') then
                s.obj[i]:make_turn();
            end;
        end;
        
        if (make_turn) then
            make_turn(s);
        end;
        
        s:check_walk();
    end;
    
    tab.getDistance = _kh.bf_calcDistance;
    tab.getDirection = _kh.bf_calcDirection;
    
    if (not tab.obj) then
        tab.obj = {};
    end;
    
    if (not tab.pic) then
        tab.pic = function(s)
            local v = "images/battle_bcg.png;images/player.png@" .. tostring(s.plX * 32 - 32) .. "," .. tostring(s.plY * 32 - 32);
            for i = 1, #s.obj do
                if (not(s.obj[i]:disabled()) and s.obj[i].pic and s.obj[i].x and s.obj[i].y) then
                    v = v .. ";" .. s.obj[i].pic .. "@" .. tostring(s.obj[i].x * 32 - 32) .. "," .. tostring(s.obj[i].y * 32 - 32);
                end;
            end;
            print(v);
            return v;
        end;
    end;
    
    table.insert(tab.obj, 'bf_north');
    table.insert(tab.obj, 'bf_northeast');
    table.insert(tab.obj, 'bf_east');
    table.insert(tab.obj, 'bf_southeast');
    table.insert(tab.obj, 'bf_south');
    table.insert(tab.obj, 'bf_southwest');
    table.insert(tab.obj, 'bf_west');
    table.insert(tab.obj, 'bf_northwest');
    table.insert(tab.obj, 'bf_wait');

    return room(tab);
end;

bf_north = obj {
    nam = "north",
    dsc = "{На север}",
    act = function(s)
        here().plY = here().plY - 1;
        p("Вы идете на север");
        here():make_turn();
    end;
};

bf_northeast = obj {
    nam = "northeast",
    dsc = "{На северо-восток}",
    act = function(s)
        here().plX = here().plX + 1;
        here().plY = here().plY - 1;
        p("Вы идете на северо-восток.");
        here():make_turn();
    end;
};

bf_east = obj {
    nam = "east",
    dsc = "{На восток}",
    act = function(s)
        here().plX = here().plX + 1;
        p("Вы идете на восток.");
        here():make_turn();
    end;
};

bf_southeast = obj {
    nam = "southeast",
    dsc = "{На юго-восток}",
    act = function(s)
        here().plX = here().plX + 1;
        here().plY = here().plY + 1;
        p("Вы идете на юго-восток.");
        here():make_turn();
    end;
};

bf_south = obj {
    nam = "south",
    dsc = "{На юг}",
    act = function(s)
        here().plY = here().plY + 1;
        p("Вы идете на юг.");
        here():make_turn();
    end;
};

bf_southwest = obj {
    nam = "southwest",
    dsc = "{На юго-запад}",
    act = function(s)
        here().plX = here().plX - 1;
        here().plY = here().plY + 1;
        p("Вы идете на юго-запад.");
        here():make_turn();
    end;
};

bf_west = obj {
    nam = "west",
    dsc = "{На запад}",
    act = function(s)
        here().plX = here().plX - 1;
        p("Вы идете на запад.");
        here():make_turn();
    end;
};

bf_northwest = obj {
    nam = "northwest",
    dsc = "{На северо-запад}",
    act = function(s)
        here().plX = here().plX - 1;
        here().plY = here().plY - 1;
        p("Вы идете на северо-запад.");
        here():make_turn();
    end;
};

bf_wait = obj {
    nam = "wait",
    dsc = "{Ждать}",
    act = function(s)
        p("Вы ждете");
        here():make_turn();
    end;
};

combatant = function(tab)
    tab.canshoot = function(s)
        local dist = here().getDistance(here().plX, here().plY, s.x, s.y);
        return dist < 4 and not tab.ally;
    end;
    
    tab.onshoot = function(s)
        local dist = here().getDistance(here().plX, here().plY, s.x, s.y);
        
        if (rnd(4) > dist) then
            if (dist == 0) then
                tab.hp = tab.hp - 2;
            end;
            
            tab.hp = tab.hp - 1;
            if (tab.hp > 0) then
                p(tab.shootHit);
            else
                p(tab.shootKill);
            end;
        else
            p(tab.shootMiss);
        end;
        
        here():make_turn();
    end;
    
    tab.canhit = function(s)
        local dist = here().getDistance(here().plX, here().plY, s.x, s.y);
        return dist == 0 and not tab.ally;
    end;
    
    
    tab.onhit = function(s)
        local dist = here().getDistance(here().plX, here().plY, s.x, s.y);
        if (dist == 0) then
            tab.hp = tab.hp - 2;
            if (tab.hp > 0) then
                p(tab.wpnHit);
            else
                p(tab.wpnKill);
            end;
            
            here():make_turn();
        else
            p(tab.wpnFar);
        end;
    end;
    
    if (not tab.act) then
        tab.act = function(s)
            if tab.ally then
                return tab.nohit;
            end;
            
            local dist = here().getDistance(here().plX, here().plY, s.x, s.y);
            
            if (dist == 0) then
                tab.hp = tab.hp - 1;
                if (tab.hp > 0) then
                    p(tab.handHit);
                else
                    p(tab.handKill);
                end;
                
                here():make_turn();
            else
                p(tab.handFar);
            end;
        end;
    end;
    if (not tab.make_turn) then
        tab.make_turn = function(s)
        end;
    end;
    
    return obj(tab);
end;