/**
 * Copyright (c) 2025 Dominic Masters
 * 
 * This software is released under the MIT License.
 * https://opensource.org/licenses/MIT
 */

#include "rendertextbox.h"
#include "ui/uitextbox.h"
#include "display/ui/rendertext.h"
#include "display/spritebatch/spritebatch.h"
#include "assert/assert.h"

void renderTextboxDraw(void) {
  if(!UI_TEXTBOX.visible) return;

  // Background
  spriteBatchPush(
    NULL,
    0, RENDER_HEIGHT - UI_TEXTBOX_HEIGHT,
    RENDER_WIDTH, RENDER_HEIGHT,
    0x00, 0x00, 0x00, 0xFF,
    0.0f, 0.0f, 1.0f, 1.0f
  );

  uint32_t x = 0;
  uint32_t y = RENDER_HEIGHT - UI_TEXTBOX_HEIGHT;

  if(UI_TEXTBOX.charsRevealed > 0) {
    uint8_t charsRendered = 0;

    // For each line
    for(uint8_t i = 0; i < UI_TEXTBOX_LINES_PER_PAGE; i++) {
      // Get count of chars in the line
      uint8_t lineLength = UI_TEXTBOX.lineLengths[
        i + (UI_TEXTBOX.page * UI_TEXTBOX_LINES_PER_PAGE)
      ];
      if(lineLength == 0) continue;

      // Determine how many chars left to render
      uint8_t lineChars = UI_TEXTBOX.charsRevealed - charsRendered;
      
      // Don't render more than in line
      if(lineChars > lineLength) lineChars = lineLength;
      assertTrue(lineChars > 0, "Line chars must be greater than 0");

      // Update how many rendered
      charsRendered += lineChars;

      for(uint8_t j = 0; j < lineChars; j++) {
        renderTextDrawChar(
          x + UI_TEXTBOX_PADDING_X + UI_TEXTBOX_BORDER_WIDTH + (
            j * FONT_TILE_WIDTH
          ),
          y + UI_TEXTBOX_PADDING_Y + UI_TEXTBOX_BORDER_HEIGHT + (
            i * FONT_TILE_HEIGHT
          ),
          UI_TEXTBOX.text[
            (i * UI_TEXTBOX_CHARS_PER_LINE) + j +
            (UI_TEXTBOX.page * UI_TEXTBOX_CHARS_PER_PAGE)
          ],
          0xFF, 0xFF, 0xFF
        );
      }

      // Check if we're done rendering text
      if(UI_TEXTBOX.charsRevealed - charsRendered == 0) break;
    }
  }
}