#include "tim.h"

void TimScrollState_selectNext(TimScrollState* l){
    l->cur = (l->cur + 1) % l->len;
}

void TimScrollState_selectPrev(TimScrollState* l){
    l->cur = (l->len + l->cur - 1) % l->len;
}

TimScrollItem* tim_scroll(TimScrollState* l, i32 x, i32 y, i32 w, i32 h, TimStyle style){
    // select with buttons and mouse wheel
    if(tim_is_key_press(TimKey_Down) 
        || (l->use_mouse_wheel && tim_is_mouse_scroll_down()))
    {
        TimScrollState_selectNext(l);
    }
    if(tim_is_key_press(TimKey_Up) 
        || (l->use_mouse_wheel && tim_is_mouse_scroll_up()))
    {
        TimScrollState_selectPrev(l);
    }
    
    tim->focus = l->items[l->cur].focus_target;

    tim_frame(x, y, w, h, style);

    TimRect absolute = tim_scope_rect_to_absolute(x, y, w, h);
    TimRect place = { .x = x + 1, .y = y + 1, .w = absolute.w - 2, .h = absolute.h - 2 };
    for(u32 i = 0; i < l->len; i++){
        TimScrollItem* item = &l->items[i];
        place.h = item->h;
        
        // select with mouse click
        if(tim_is_mouse_click_over(tim_scope_rect_to_absolute(place.x, place.y, place.w, place.h))){
            l->cur = i;
            tim->focus = item->focus_target;
        }

        item->draw(i == l->cur, place, item->data);
        place.y += place.h;
    }

    return &l->items[l->cur];
}