/**
 * Copyright (c) 2026 Dominic Masters
 *
 * This software is released under the MIT License.
 * https://opensource.org/licenses/MIT
 */

#include "uitextboxmain.h"
#include "ui/focus/uifocus.h"
#include "display/screen/screen.h"
#include "display/text/text.h"
#include "display/color.h"
#include "display/spritebatch/spritebatch.h"
#include "display/shader/shaderunlit.h"
#include "ui/frame/uiframe.h"

uitextboxmain_t UI_TEXTBOX_MAIN;
static uifocusitem_t *focusItem = NULL;

errorret_t uiTextboxMainInit(void) {
  uiTextboxInit(
    &UI_TEXTBOX_MAIN.box,
    UI_TEXTBOX_MAIN.text, UI_TEXTBOX_MAIN_TEXT_MAX,
    UI_TEXTBOX_MAIN.lines, UI_TEXTBOX_MAIN_LINES_MAX
  );
  errorOk();
}

void uiTextboxMainSetText(const char_t *text) {
  uiTextboxSetText(&UI_TEXTBOX_MAIN.box, text);
  if(focusItem != NULL) return;
  focusItem = uiFocusPush(
    1, 1,
    uiTextboxMainFocusSelected,
    NULL,
    uiTextboxMainFocusClosed,
    NULL,
    NULL
  );
}

errorret_t uiTextboxMainUpdate(void) {
  if(focusItem == NULL) errorOk();
  return uiTextboxUpdate(&UI_TEXTBOX_MAIN.box);
}

errorret_t uiTextboxMainDraw(void) {
  if(focusItem == NULL) errorOk();
  float_t fontH = (float_t)FONT_DEFAULT.tileset->tileHeight;
  float_t h = (float_t)UI_TEXTBOX_MAIN_LINES * fontH +
    (float_t)(UI_TEXTBOX_MAIN_LINES - 1) * UI_TEXTBOX_LINE_SPACING +
    2.0f * (float_t)UI_FRAME_START_Y;
  float_t w = (float_t)SCREEN.scanWidth;
  float_t x = (float_t)SCREEN.scanX;
  float_t y = (float_t)(SCREEN.scanY + SCREEN.scanHeight) - h;
  errorChain(uiTextboxDraw(&UI_TEXTBOX_MAIN.box, x, y, w, h));

  if(!uiTextboxPageIsComplete(&UI_TEXTBOX_MAIN.box)) errorOk();

  float_t fontW = (float_t)FONT_DEFAULT.tileset->tileWidth;
  float_t contentX = x + (float_t)UI_FRAME_START_X;
  float_t contentY = y + (float_t)UI_FRAME_START_Y;
  float_t contentW = w - 2.0f * (float_t)UI_FRAME_START_X;
  float_t contentH = h - 2.0f * (float_t)UI_FRAME_START_Y;

  shadermaterial_t material = {
    .unlit = {
      .color = COLOR_WHITE,
      .texture = FONT_DEFAULT.texture
    }
  };

  spritebatchsprite_t caret = textGetSprite(
    (vec2){
      contentX + contentW - fontW,
      contentY + contentH - fontH
    },
    'v',
    &FONT_DEFAULT
  );
  errorChain(spriteBatchBuffer(&caret, 1, &SHADER_UNLIT, material));

  errorOk();
}

bool_t uiTextboxMainPageIsComplete(void) {
  return uiTextboxPageIsComplete(&UI_TEXTBOX_MAIN.box);
}

bool_t uiTextboxMainHasNextPage(void) {
  return uiTextboxHasNextPage(&UI_TEXTBOX_MAIN.box);
}

void uiTextboxMainNextPage(void) {
  uiTextboxNextPage(&UI_TEXTBOX_MAIN.box);
}

bool_t uiTextboxMainIsActive(void) {
  return focusItem != NULL;
}

bool_t uiTextboxMainFocusSelected(const uifocusitem_t *item) {
  if(!uiTextboxPageIsComplete(&UI_TEXTBOX_MAIN.box)) {
    UI_TEXTBOX_MAIN.box.scroll =
      uiTextboxGetPageCharCount(&UI_TEXTBOX_MAIN.box);
    return true;
  }

  if(uiTextboxHasNextPage(&UI_TEXTBOX_MAIN.box)) {
    uiTextboxNextPage(&UI_TEXTBOX_MAIN.box);
    return true;
  }

  uiFocusPopItem(focusItem);
  return true;
}

bool_t uiTextboxMainFocusClosed(const uifocusitem_t *item) {
  focusItem = NULL;
  return true;
}