/**
 * @file vaati3BackgroundManager.c
 * @ingroup Managers
 *
 * @brief Scrolling background during Vaati 3.
 */
#include "manager/vaati3BackgroundManager.h"
#include "area.h"
#include "common.h"
#include "room.h"
#include "screen.h"
#include "game.h"

void Vaati3BackgroundManager_OnEnterRoom(Vaati3BackgroundManager*);

void Vaati3BackgroundManager_Main(Vaati3BackgroundManager* this) {
    if (this == NULL) {
        if (gArea.onEnter != Vaati3BackgroundManager_OnEnterRoom) {
            Vaati3BackgroundManager_OnEnterRoom(NULL);
        }
    } else {
        if (super->action == 0) {
            super->action = 1;
            super->flags |= ENT_PERSIST;
            SetEntityPriority((Entity*)this, PRIO_PLAYER_EVENT);
            if (gArea.onEnter == NULL) {
                RegisterTransitionHandler(this, Vaati3BackgroundManager_OnEnterRoom, NULL);
            } else {
                DeleteThisEntity();
            }
        } else {
            gRoomControls.bg3OffsetX.WORD -= 0x4000;
            gRoomControls.bg3OffsetY.WORD -= 0x2000;
            gScreen.bg3.xOffset = gRoomControls.scroll_x + gRoomControls.bg3OffsetX.HALF.HI;
            gScreen.bg3.yOffset = gRoomControls.scroll_y + gRoomControls.bg3OffsetY.HALF.HI;
        }
    }
}

void Vaati3BackgroundManager_OnEnterRoom(Vaati3BackgroundManager* this) {
    LoadGfxGroup(0x4c);
    gScreen.bg3.control = 0x1e07;
    gScreen.lcd.displayControl |= DISPCNT_BG3_ON;
    gScreen.bg3.xOffset = gRoomControls.scroll_x + gRoomControls.bg3OffsetX.HALF.HI;
    gScreen.bg3.yOffset = gRoomControls.scroll_y + gRoomControls.bg3OffsetY.HALF.HI;
}