/**
  * @file lv_sw.c
  *
  */
 
 /*********************
  *      INCLUDES
  *********************/
 #include "lv_switch.h"
 
 #if LV_USE_SWITCH != 0
 
 #include "../misc/lv_assert.h"
 #include "../misc/lv_math.h"
 #include "../misc/lv_anim.h"
 #include "../core/lv_indev.h"
 #include "../core/lv_disp.h"
 #include "lv_img.h"
 
 /*********************
  *      DEFINES
  *********************/
 #define MY_CLASS &lv_switch_class
 
 #define LV_SWITCH_IS_ANIMATING(sw) (((sw)->anim_state) != LV_SWITCH_ANIM_STATE_INV)
 
 /** Switch animation start value. (Not the real value of the switch just indicates process animation)*/
 #define LV_SWITCH_ANIM_STATE_START 0
 
 /** Switch animation end value.  (Not the real value of the switch just indicates process animation)*/
 #define LV_SWITCH_ANIM_STATE_END   256
 
 /** Mark no animation is in progress*/
 #define LV_SWITCH_ANIM_STATE_INV   -1
 
 /**********************
  *      TYPEDEFS
  **********************/
 
 /**********************
  *  STATIC PROTOTYPES
  **********************/
 static void lv_switch_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_switch_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
 static void lv_switch_event(const lv_obj_class_t * class_p, lv_event_t * e);
 static void draw_main(lv_event_t * e);
 
 static void lv_switch_anim_exec_cb(void * sw, int32_t value);
 static void lv_switch_trigger_anim(lv_obj_t * obj);
 static void lv_switch_anim_ready(lv_anim_t * a);
 /**********************
  *  STATIC VARIABLES
  **********************/
 const lv_obj_class_t lv_switch_class = {
     .constructor_cb = lv_switch_constructor,
     .destructor_cb = lv_switch_destructor,
     .event_cb = lv_switch_event,
     .width_def = (4 * LV_DPI_DEF) / 10,
     .height_def = (4 * LV_DPI_DEF) / 17,
     .group_def = LV_OBJ_CLASS_GROUP_DEF_TRUE,
     .instance_size = sizeof(lv_switch_t),
     .base_class = &lv_obj_class
 };
 
 /**********************
  *      MACROS
  **********************/
 
 /**********************
  *   GLOBAL FUNCTIONS
  **********************/
 
 lv_obj_t * lv_switch_create(lv_obj_t * parent)
 {
     LV_LOG_INFO("begin");
     lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
     lv_obj_class_init_obj(obj);
     return obj;
 }
 
 /**********************
  *   STATIC FUNCTIONS
  **********************/
 
 static void lv_switch_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
     LV_UNUSED(class_p);
     LV_TRACE_OBJ_CREATE("begin");
 
     lv_switch_t * sw = (lv_switch_t *)obj;
 
     sw->anim_state = LV_SWITCH_ANIM_STATE_INV;
 
     lv_obj_clear_flag(obj, LV_OBJ_FLAG_SCROLLABLE);
     lv_obj_add_flag(obj, LV_OBJ_FLAG_CHECKABLE);
     lv_obj_add_flag(obj, LV_OBJ_FLAG_SCROLL_ON_FOCUS);
 
     LV_TRACE_OBJ_CREATE("finished");
 }
 
 static void lv_switch_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
 {
     LV_UNUSED(class_p);
     lv_switch_t * sw = (lv_switch_t *)obj;
 
     lv_anim_del(sw, NULL);
 }
 
 static void lv_switch_event(const lv_obj_class_t * class_p, lv_event_t * e)
 {
     LV_UNUSED(class_p);
 
     lv_res_t res;
 
     /*Call the ancestor's event handler*/
     res = lv_obj_event_base(MY_CLASS, e);
     if(res != LV_RES_OK) return;
 
     lv_event_code_t code = lv_event_get_code(e);
     lv_obj_t * obj = lv_event_get_target(e);
 
     if(code == LV_EVENT_REFR_EXT_DRAW_SIZE) {
         lv_coord_t knob_left = lv_obj_get_style_pad_left(obj,   LV_PART_KNOB);
         lv_coord_t knob_right = lv_obj_get_style_pad_right(obj,  LV_PART_KNOB);
         lv_coord_t knob_top = lv_obj_get_style_pad_top(obj,    LV_PART_KNOB);
         lv_coord_t knob_bottom = lv_obj_get_style_pad_bottom(obj, LV_PART_KNOB);
 
         /*The smaller size is the knob diameter*/
         lv_coord_t knob_size = LV_MAX4(knob_left, knob_right, knob_bottom, knob_top);
         knob_size += _LV_SWITCH_KNOB_EXT_AREA_CORRECTION;
         knob_size += lv_obj_calculate_ext_draw_size(obj, LV_PART_KNOB);
 
         lv_coord_t * s = lv_event_get_param(e);
         *s = LV_MAX(*s, knob_size);
         *s = LV_MAX(*s, lv_obj_calculate_ext_draw_size(obj, LV_PART_INDICATOR));
     }
     else if(code == LV_EVENT_VALUE_CHANGED) {
         lv_switch_trigger_anim(obj);
         lv_obj_invalidate(obj);
     }
     else if(code == LV_EVENT_DRAW_MAIN) {
         draw_main(e);
     }
 }
 
 static void draw_main(lv_event_t * e)
 {
     lv_obj_t * obj = lv_event_get_target(e);
     lv_switch_t * sw = (lv_switch_t *)obj;
 
     lv_draw_ctx_t * draw_ctx = lv_event_get_draw_ctx(e);
 
     /*Calculate the indicator area*/
     lv_coord_t bg_left = lv_obj_get_style_pad_left(obj,     LV_PART_MAIN);
     lv_coord_t bg_right = lv_obj_get_style_pad_right(obj,   LV_PART_MAIN);
     lv_coord_t bg_top = lv_obj_get_style_pad_top(obj,       LV_PART_MAIN);
     lv_coord_t bg_bottom = lv_obj_get_style_pad_bottom(obj, LV_PART_MAIN);
 
     /*Draw the indicator*/
     /*Respect the background's padding*/
     lv_area_t indic_area;
     lv_area_copy(&indic_area, &obj->coords);
     indic_area.x1 += bg_left;
     indic_area.x2 -= bg_right;
     indic_area.y1 += bg_top;
     indic_area.y2 -= bg_bottom;
 
     lv_draw_rect_dsc_t draw_indic_dsc;
     lv_draw_rect_dsc_init(&draw_indic_dsc);
     lv_obj_init_draw_rect_dsc(obj, LV_PART_INDICATOR, &draw_indic_dsc);
     lv_draw_rect(draw_ctx, &draw_indic_dsc, &indic_area);
 
     /*Draw the knob*/
     lv_coord_t anim_value_x = 0;
     lv_coord_t knob_size = lv_obj_get_height(obj);
     lv_coord_t anim_length = lv_area_get_width(&obj->coords) - knob_size;
 
     if(LV_SWITCH_IS_ANIMATING(sw)) {
         /* Use the animation's coordinate */
         anim_value_x = (anim_length * sw->anim_state) / LV_SWITCH_ANIM_STATE_END;
     }
     else {
         /* Use LV_STATE_CHECKED to decide the coordinate */
         bool chk = lv_obj_get_state(obj) & LV_STATE_CHECKED;
         anim_value_x = chk ? anim_length : 0;
     }
 
     if(LV_BASE_DIR_RTL == lv_obj_get_style_base_dir(obj, LV_PART_MAIN)) {
         anim_value_x = anim_length - anim_value_x;
     }
 
     lv_area_t knob_area;
     knob_area.x1 = obj->coords.x1 + anim_value_x;
     knob_area.x2 = knob_area.x1 + knob_size;
 
     knob_area.y1 = obj->coords.y1;
     knob_area.y2 = obj->coords.y2;
 
     lv_coord_t knob_left = lv_obj_get_style_pad_left(obj, LV_PART_KNOB);
     lv_coord_t knob_right = lv_obj_get_style_pad_right(obj, LV_PART_KNOB);
     lv_coord_t knob_top = lv_obj_get_style_pad_top(obj, LV_PART_KNOB);
     lv_coord_t knob_bottom = lv_obj_get_style_pad_bottom(obj, LV_PART_KNOB);
 
     /*Apply the paddings on the knob area*/
     knob_area.x1 -= knob_left;
     knob_area.x2 += knob_right;
     knob_area.y1 -= knob_top;
     knob_area.y2 += knob_bottom;
 
     lv_draw_rect_dsc_t knob_rect_dsc;
     lv_draw_rect_dsc_init(&knob_rect_dsc);
     lv_obj_init_draw_rect_dsc(obj, LV_PART_KNOB, &knob_rect_dsc);
 
     lv_draw_rect(draw_ctx, &knob_rect_dsc, &knob_area);
 }
 
 static void lv_switch_anim_exec_cb(void * var, int32_t value)
 {
     lv_switch_t * sw = var;
     sw->anim_state = value;
     lv_obj_invalidate((lv_obj_t *)sw);
 }
 
 /**
  * Resets the switch's animation state to "no animation in progress".
  */
 static void lv_switch_anim_ready(lv_anim_t * a)
 {
     lv_switch_t * sw = a->var;
     sw->anim_state = LV_SWITCH_ANIM_STATE_INV;
     lv_obj_invalidate((lv_obj_t *)sw);
 }
 
 /**
  * Starts an animation for the switch knob. if the anim_time style property is greater than 0
  * @param obj the switch to animate
  */
 static void lv_switch_trigger_anim(lv_obj_t * obj)
 {
     LV_ASSERT_OBJ(obj, MY_CLASS);
     lv_switch_t * sw = (lv_switch_t *)obj;
 
     uint32_t anim_dur_full = lv_obj_get_style_anim_time(obj, LV_PART_MAIN);
 
     if(anim_dur_full > 0) {
         bool chk = lv_obj_get_state(obj) & LV_STATE_CHECKED;
         int32_t anim_start;
         int32_t anim_end;
         /*No animation in progress -> simply set the values*/
         if(sw->anim_state == LV_SWITCH_ANIM_STATE_INV) {
             anim_start = chk ? LV_SWITCH_ANIM_STATE_START : LV_SWITCH_ANIM_STATE_END;
             anim_end   = chk ? LV_SWITCH_ANIM_STATE_END : LV_SWITCH_ANIM_STATE_START;
         }
         /*Animation in progress. Start from the animation end value*/
         else {
             anim_start = sw->anim_state;
             anim_end   = chk ? LV_SWITCH_ANIM_STATE_END : LV_SWITCH_ANIM_STATE_START;
         }
         /*Calculate actual animation duration*/
         uint32_t anim_dur = (anim_dur_full * LV_ABS(anim_start - anim_end)) / LV_SWITCH_ANIM_STATE_END;
 
         /*Stop the previous animation if it exists*/
         lv_anim_del(sw, NULL);
 
         lv_anim_t a;
         lv_anim_init(&a);
         lv_anim_set_var(&a, sw);
         lv_anim_set_exec_cb(&a, lv_switch_anim_exec_cb);
         lv_anim_set_values(&a, anim_start, anim_end);
         lv_anim_set_ready_cb(&a, lv_switch_anim_ready);
         lv_anim_set_time(&a, anim_dur);
         lv_anim_start(&a);
     }
 }
 
 
 #endif

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