/**
 * @file EditorWidget.h
 * @author apio (cloudapio.eu)
 * @brief Multiline text editing widget.
 *
 * @copyright Copyright (c) 2024, the Luna authors.
 *
 */

#include <luna/String.h>
#include <os/Timer.h>
#include <ui/Font.h>
#include <ui/Widget.h>

class EditorWidget : public ui::Widget
{
  public:
    EditorWidget(SharedPtr<ui::Font> font);

    Result<void> load_file(const os::Path& path);

    Result<void> save_file();

    Result<ui::EventResult> handle_key_event(const ui::KeyEventRequest& request) override;

    Result<void> draw(ui::Canvas& canvas) override;

  private:
    SharedPtr<ui::Font> m_font;

    Buffer m_data;

    struct Line
    {
        usize begin;
        usize end;
    };
    Vector<Line> m_lines;

    usize m_cursor { 0 };
    ui::Point m_cursor_position { 0, 0 };

    OwnedPtr<os::Timer> m_cursor_timer;
    bool m_cursor_activated = true;

    os::Path m_path { AT_FDCWD };

    void tick_cursor();

    Result<void> recalculate_lines();
    void recalculate_cursor_position();
    void recalculate_cursor_index();
};