#ifndef YAZE_GUI_CANVAS_H
#define YAZE_GUI_CANVAS_H

#include <imgui/imgui.h>

#include <cmath>
#include <string>

#include "app/gfx/bitmap.h"
#include "app/rom.h"

namespace yaze {
namespace app {
namespace gui {

using app::gfx::Bitmap;
using app::gfx::BitmapTable;

enum class CanvasType { kTile, kBlock, kMap };
enum class CanvasMode { kPaint, kSelect };
enum class CanvasGridSize { k8x8, k16x16, k32x32, k64x64 };

class Canvas {
 public:
  Canvas() = default;
  explicit Canvas(ImVec2 canvas_size)
      : custom_canvas_size_(true), canvas_sz_(canvas_size) {}
  explicit Canvas(ImVec2 canvas_size, CanvasGridSize grid_size)
      : custom_canvas_size_(true), canvas_sz_(canvas_size) {
    switch (grid_size) {
      case CanvasGridSize::k8x8:
        custom_step_ = 8.0f;
        break;
      case CanvasGridSize::k16x16:
        custom_step_ = 16.0f;
        break;
      case CanvasGridSize::k32x32:
        custom_step_ = 32.0f;
        break;
      case CanvasGridSize::k64x64:
        custom_step_ = 64.0f;
        break;
    }
  }

  void Update(const gfx::Bitmap& bitmap, ImVec2 bg_size, int tile_size,
              float scale = 1.0f, float grid_size = 64.0f);

  void UpdateColorPainter(gfx::Bitmap& bitmap, const ImVec4& color,
                          const std::function<void()>& event, int tile_size,
                          float scale = 1.0f);

  void UpdateEvent(const std::function<void()>& event, ImVec2 bg_size,
                   int tile_size, float scale = 1.0f, float grid_size = 64.0f);

  void UpdateInfoGrid(ImVec2 bg_size, int tile_size, float scale = 1.0f,
                      float grid_size = 64.0f);

  // Background for the Canvas represents region without any content drawn to
  // it, but can be controlled by the user.
  void DrawBackground(ImVec2 canvas_size = ImVec2(0, 0), bool drag = false);

  // Context Menu refers to what happens when the right mouse button is pressed
  // This routine also handles the scrolling for the canvas.
  void DrawContextMenu();

  // Tile painter shows a preview of the currently selected tile
  // and allows the user to left click to paint the tile or right
  // click to select a new tile to paint with.
  bool DrawTilePainter(const Bitmap& bitmap, int size, float scale = 1.0f);
  bool DrawSolidTilePainter(const ImVec4& color, int size);

  // Draws a tile on the canvas at the specified position
  void DrawTileOnBitmap(int tile_size, gfx::Bitmap& bitmap, ImVec4 color);

  // Dictates which tile is currently selected based on what the user clicks
  // in the canvas window. Represented and split apart into a grid of tiles.
  bool DrawTileSelector(int size);

  bool HandleTileEdits(Canvas& blockset_canvas,
                       std::vector<gfx::Bitmap>& source_blockset,
                       int& current_tile, float scale = 1.0f,
                       int tile_painter_size = 16, int tiles_per_row = 8);

  // Draws the contents of the Bitmap image to the Canvas
  void DrawBitmap(const Bitmap& bitmap, int border_offset = 0,
                  bool ready = true);
  void DrawBitmap(const Bitmap& bitmap, int border_offset, float scale);
  void DrawBitmap(const Bitmap& bitmap, int x_offset = 0, int y_offset = 0,
                  float scale = 1.0f);

  void DrawBitmapTable(const BitmapTable& gfx_bin);

  void DrawBitmapGroup(std::vector<int> &group,
                       std::vector<gfx::Bitmap>& tile16_individual_,
                       int tile_size, float scale = 1.0f);

  void DrawOutline(int x, int y, int w, int h);
  void DrawOutlineWithColor(int x, int y, int w, int h, ImVec4 color);
  void DrawOutlineWithColor(int x, int y, int w, int h, uint32_t color);
  void DrawSelectRect(int tile_size, float scale = 1.0f);
  void DrawRect(int x, int y, int w, int h, ImVec4 color);
  void DrawText(std::string text, int x, int y);
  void DrawGridLines(float grid_step);
  void DrawGrid(float grid_step = 64.0f, int tile_id_offset = 8);
  void DrawOverlay();  // last
  void SetCanvasSize(ImVec2 canvas_size) {
    canvas_sz_ = canvas_size;
    custom_canvas_size_ = true;
  }
  bool IsMouseHovering() const { return is_hovered_; }
  void ZoomIn() { global_scale_ += 0.1f; }
  void ZoomOut() { global_scale_ -= 0.1f; }

  auto points() const { return points_; }
  auto mutable_points() { return &points_; }
  auto push_back(ImVec2 pos) { points_.push_back(pos); }
  auto draw_list() const { return draw_list_; }
  auto zero_point() const { return canvas_p0_; }
  auto scrolling() const { return scrolling_; }
  auto drawn_tile_position() const { return drawn_tile_pos_; }
  auto canvas_size() const { return canvas_sz_; }
  void set_global_scale(float scale) { global_scale_ = scale; }
  auto global_scale() const { return global_scale_; }
  auto custom_labels_enabled() { return &enable_custom_labels_; }
  auto custom_step() const { return custom_step_; }
  auto width() const { return canvas_sz_.x; }
  auto height() const { return canvas_sz_.y; }

  auto labels(int i) {
    if (i >= labels_.size()) {
      labels_.push_back(ImVector<std::string>());
    }
    return labels_[i];
  }
  auto mutable_labels(int i) {
    if (i >= labels_.size()) {
      labels_.push_back(ImVector<std::string>());
    }
    return &labels_[i];
  }

  int GetTileIdFromMousePos() {
    int x = mouse_pos_in_canvas_.x;
    int y = mouse_pos_in_canvas_.y;
    int num_columns = width() / custom_step_;
    int num_rows = height() / custom_step_;
    int tile_id = (x / custom_step_) + (y / custom_step_) * num_columns;
    if (tile_id >= num_columns * num_rows) {
      tile_id = -1;  // Invalid tile ID
    }
    return tile_id;
  }

  auto set_current_labels(int i) { current_labels_ = i; }
  auto set_highlight_tile_id(int i) { highlight_tile_id = i; }
  auto set_draggable(bool value) { draggable_ = value; }

  auto selected_tiles() const { return selected_tiles_; }
  auto mutable_selected_tiles() { return &selected_tiles_; }

 private:
  bool draggable_ = false;
  bool enable_grid_ = true;
  bool enable_hex_tile_labels_ = false;
  bool enable_custom_labels_ = false;
  bool enable_context_menu_ = true;
  bool custom_canvas_size_ = false;
  bool is_hovered_ = false;

  float custom_step_ = 0.0f;
  float global_scale_ = 1.0f;

  int current_labels_ = 0;
  int highlight_tile_id = -1;

  ImDrawList* draw_list_;
  ImVector<ImVec2> points_;
  ImVector<ImVector<std::string>> labels_;
  ImVec2 scrolling_;
  ImVec2 canvas_sz_;
  ImVec2 canvas_p0_;
  ImVec2 canvas_p1_;
  ImVec2 mouse_pos_in_canvas_;
  ImVec2 drawn_tile_pos_;

  std::vector<int> selected_tiles_;
};

}  // namespace gui
}  // namespace app
}  // namespace yaze

#endif