// Aseprite UI Library
// Copyright (C) 2018-2024  Igara Studio S.A.
// Copyright (C) 2001-2017  David Capello
//
// This file is released under the terms of the MIT license.
// Read LICENSE.txt for more information.

#ifndef UI_ENTRY_H_INCLUDED
#define UI_ENTRY_H_INCLUDED
#pragma once

#include "base/codepoint.h"
#include "obs/signal.h"
#include "ui/widget.h"

#include <memory>

namespace ui {

class MouseMessage;

class Entry : public Widget {
public:
  struct Range {
    int from = -1, to = -1;
    Range() {}
    Range(int from, int to) : from(from), to(to) {}
    bool isEmpty() const { return from < 0; }
    int size() const { return to - from; }
    void reset() { from = to = -1; }
  };

  Entry(const int maxsize, const char* format, ...);
  ~Entry();

  void setMaxTextLength(const int maxsize);

  bool isReadOnly() const;
  void setReadOnly(bool state);

  void showCaret();
  void hideCaret();

  int caretPos() const { return m_caret; }
  int lastCaretPos() const;
  gfx::Point caretPosOnScreen() const;

  void setCaretPos(int pos);
  void setCaretToEnd();
  bool isCaretVisible() const { return !m_hidden && m_state; }

  void selectText(int from, int to);
  void selectAllText();
  void deselectText();
  std::string selectedText() const;
  Range selectedRange() const;

  // Set to true if you want to persists the selection when the
  // keyboard focus is lost/re-enters.
  void setPersistSelection(bool state) { m_persist_selection = state; }

  void setSuffix(const std::string& suffix);
  std::string getSuffix();

  void setTranslateDeadKeys(bool state);

  // for themes
  void getEntryThemeInfo(int* scroll, int* caret, int* state, Range* range) const;
  gfx::Rect getEntryTextBounds() const;

  gfx::PointF scale() const { return m_scale; }
  void setScale(const gfx::PointF& scale) { m_scale = scale; }

  static gfx::Size sizeHintWithText(Entry* entry, const std::string& text);

  // Signals
  obs::signal<void()> Change;

protected:
  gfx::Rect getCharBoxBounds(int i) const;

  // Events
  bool onProcessMessage(Message* msg) override;
  void onSizeHint(SizeHintEvent& ev) override;
  void onPaint(PaintEvent& ev) override;
  void onSetFont() override;
  void onSetText() override;
  float onGetTextBaseline() const override;

  // New Events
  virtual void onChange();
  virtual gfx::Rect onGetEntryTextBounds() const;

private:
  enum class EntryCmd {
    NoOp,
    InsertChar,
    ForwardChar,
    ForwardWord,
    BackwardChar,
    BackwardWord,
    BeginningOfLine,
    EndOfLine,
    DeleteForward,
    DeleteBackward,
    DeleteBackwardWord,
    DeleteForwardToEndOfLine,
    Cut,
    Copy,
    Paste,
    SelectAll,
  };

  int getCaretFromMouse(MouseMessage* mousemsg);
  void executeCmd(EntryCmd cmd, base::codepoint_t unicodeChar, bool shift_pressed);
  void forwardWord();
  void backwardWord();
  Range wordRange(int pos);
  bool isPosInSelection(int pos);
  void showEditPopupMenu(const gfx::Point& pt);
  void recalcCharBoxes(const std::string& text);
  bool shouldStartTimer(const bool hasFocus);
  void deleteRange(const Range& range, std::string& text);
  void startTimer();
  void stopTimer();

  class CalcBoxesTextDelegate;

  struct CharBox {
    int codepoint = 0;
    int from = 0;
    int to = 0;
    float x = 0.0f;
    float width = 0.0f;
  };

  using CharBoxes = std::vector<CharBox>;

  CharBoxes m_boxes;
  int m_maxsize;
  int m_caret;
  int m_scroll;
  int m_select;
  bool m_hidden : 1;
  bool m_state : 1; // show or not the text caret
  bool m_readonly : 1;
  bool m_recent_focused : 1;
  bool m_lock_selection : 1;
  bool m_persist_selection : 1;
  bool m_translate_dead_keys : 1;
  Range m_selecting_words;
  std::unique_ptr<std::string> m_suffix;

  // Scale (1.0 by default) applied to each axis. Can be used in
  // case you are going to display/paint the text scaled and want to
  // convert the mouse position correctly.
  gfx::PointF m_scale;
};

} // namespace ui

#endif
