#include "ui_window.h"
#include <SDL3/SDL_events.h>
#include "gfx/shape_renderer.h"
#include "gfx/txt_renderer.h"

UIWindow::UIWindow(const char* title, int x, int y, int width, int height) {
  _title = title;
  _x = x;
  _y = y;
  _width        = width;
  _height       = height;
  _content      = nullptr;
  _is_dragging  = false;
  _is_hovered   = false;
  _is_focused   = false; /* Not focused by default? */
}

void UIWindow::set_content(Terminal* term) {
  _content = term;
}

void UIWindow::set_focused(bool focused) {
  _is_focused = focused;
}

Terminal* UIWindow::get_content(void) {
  return _content;
}

bool UIWindow::is_point_inside(int x, int y) {
  return (x >= _x && x <= _x + _width &&
          y >= _y && y <= _y + _height);
}

void UIWindow::render(ShapeRenderer* shape_renderer, TextRenderer* txt_renderer,
                      int screen_height, bool show_cursor) {
  int title_bar_height = 30;

  /* Define colours. */
  float frame_color[]             = { 0.2f,  0.2f,  0.25f };
  float title_bar_color[]         = { 0.15f, 0.15f, 0.2f  };
  float focused_title_bar_color[] = { 0.3f, 0.3f, 0.4f };
  float title_text_color[]        = { 0.9f,  0.9f,  0.9f  };

  /* Convert top-left coords to bottom-left for OpenGL. */
  int y_gl = screen_height - _y - _height;

  /* Draw main window frame/background. */
  shape_renderer->draw_rect(_x, y_gl, _width, _height, frame_color);

  /* Draw title bar. */
  if(_is_focused) {
    shape_renderer->draw_rect(_x, y_gl+_height-title_bar_height, _width, title_bar_height,
                              focused_title_bar_color);
  } else {
    shape_renderer->draw_rect(_x, y_gl+_height-title_bar_height, _width, title_bar_height,
                              title_bar_color);
  }

  /* Draw title text. */
  txt_renderer->render_text(_title.c_str(), _x+5, y_gl+_height-title_bar_height+8,
                            1.0f, title_text_color);

  if(_content) {
    int content_y_gl = y_gl;
    int content_height_gl = _height - title_bar_height;
    _content->render(txt_renderer, _x, content_y_gl, _width, content_height_gl, show_cursor);
  }
}

void UIWindow::handle_event(SDL_Event* event) {
  int title_bar_height = 30;

  if(event->type == SDL_EVENT_MOUSE_BUTTON_DOWN) {
    int mouse_x = event->button.x;
    int mouse_y = event->button.y;

    /* Is click within title bar? */
    if(mouse_x >= _x && mouse_x <= _x + _width &&
       mouse_y >= _y && mouse_y <= _y + title_bar_height) {
      _is_dragging = true;
      _drag_offset_x = mouse_x - _x;
      _drag_offset_y = mouse_y - _y;
    }
  } else if(event->type == SDL_EVENT_MOUSE_BUTTON_UP) {
    _is_dragging = false;
  } else if(event->type == SDL_EVENT_MOUSE_MOTION) {
    if(_is_dragging) {
      _x = event->motion.x - _drag_offset_x;
      _y = event->motion.y - _drag_offset_y;
    }

    /* Check if mouse hovered over window. */
    _is_hovered = is_point_inside(event->motion.x, event->motion.y);
  } else if(event->type == SDL_EVENT_MOUSE_WHEEL) {
    /* Only scroll window if mouse is hovering. */
    if(_is_hovered && _content) {
      /* SDL's wheel motion is negative scroll up on the y. */
      int content_height_gl = _height - title_bar_height;
      _content->scroll(-event->wheel.y, content_height_gl);
    }
  }
}