/*************************************************************************/
/*  line_edit.h                                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef LINE_EDIT_H
#define LINE_EDIT_H

#include "scene/gui/control.h"
#include "scene/gui/popup_menu.h"

class LineEdit : public Control {
	GDCLASS(LineEdit, Control);

public:
	enum Align {
		ALIGN_LEFT,
		ALIGN_CENTER,
		ALIGN_RIGHT,
		ALIGN_FILL
	};

	enum MenuItems {
		MENU_CUT,
		MENU_COPY,
		MENU_PASTE,
		MENU_CLEAR,
		MENU_SELECT_ALL,
		MENU_UNDO,
		MENU_REDO,
		MENU_DIR_INHERITED,
		MENU_DIR_AUTO,
		MENU_DIR_LTR,
		MENU_DIR_RTL,
		MENU_DISPLAY_UCC,
		MENU_INSERT_LRM,
		MENU_INSERT_RLM,
		MENU_INSERT_LRE,
		MENU_INSERT_RLE,
		MENU_INSERT_LRO,
		MENU_INSERT_RLO,
		MENU_INSERT_PDF,
		MENU_INSERT_ALM,
		MENU_INSERT_LRI,
		MENU_INSERT_RLI,
		MENU_INSERT_FSI,
		MENU_INSERT_PDI,
		MENU_INSERT_ZWJ,
		MENU_INSERT_ZWNJ,
		MENU_INSERT_WJ,
		MENU_INSERT_SHY,
		MENU_MAX
	};

private:
	Align align = ALIGN_LEFT;

	bool editable = false;
	bool pass = false;
	bool text_changed_dirty = false;

	String undo_text;
	String text;
	String placeholder;
	String placeholder_translated;
	String secret_character = "*";
	float placeholder_alpha = 0.6;
	String ime_text;
	Point2 ime_selection;

	RID text_rid;
	float full_width = 0.0;

	bool selecting_enabled = true;

	bool context_menu_enabled = true;
	PopupMenu *menu = nullptr;
	PopupMenu *menu_dir = nullptr;
	PopupMenu *menu_ctl = nullptr;

	bool caret_mid_grapheme_enabled = false;

	int caret_column = 0;
	int scroll_offset = 0;
	int max_length = 0; // 0 for no maximum.

	Dictionary opentype_features;
	String language;
	TextDirection text_direction = TEXT_DIRECTION_AUTO;
	TextDirection input_direction = TEXT_DIRECTION_LTR;
	Control::StructuredTextParser st_parser = STRUCTURED_TEXT_DEFAULT;
	Array st_args;
	bool draw_control_chars = false;

	bool expand_to_text_length = false;
	bool window_has_focus = true;

	bool clear_button_enabled = false;

	bool shortcut_keys_enabled = true;

	bool virtual_keyboard_enabled = true;

	Ref<Texture2D> right_icon;

	struct Selection {
		int begin = 0;
		int end = 0;
		int start_column = 0;
		bool enabled = false;
		bool creating = false;
		bool double_click = false;
		bool drag_attempt = false;
	} selection;

	struct TextOperation {
		int caret_column = 0;
		int scroll_offset = 0;
		int cached_width = 0;
		String text;
	};
	List<TextOperation> undo_stack;
	List<TextOperation>::Element *undo_stack_pos = nullptr;

	struct ClearButtonStatus {
		bool press_attempt = false;
		bool pressing_inside = false;
	} clear_button_status;

	uint64_t last_dblclk = 0;
	Vector2 last_dblclk_pos;

	bool caret_blink_enabled = false;
	bool caret_force_displayed = false;
	bool draw_caret = true;
	Timer *caret_blink_timer = nullptr;

	bool _is_over_clear_button(const Point2 &p_pos) const;

	void _clear_undo_stack();
	void _clear_redo();
	void _create_undo_state();

	int _get_menu_action_accelerator(const String &p_action);

	void _shape();
	void _fit_to_width();
	void _text_changed();
	void _emit_text_change();

	void shift_selection_check_pre(bool);
	void shift_selection_check_post(bool);

	void selection_fill_at_caret();
	void set_scroll_offset(int p_pos);
	int get_scroll_offset() const;

	void set_caret_at_pixel_pos(int p_x);
	Vector2i get_caret_pixel_pos();

	void _reset_caret_blink_timer();
	void _toggle_draw_caret();

	void clear_internal();
	void changed_internal();

	void _editor_settings_changed();

	void _swap_current_input_direction();
	void _move_caret_left(bool p_select, bool p_move_by_word = false);
	void _move_caret_right(bool p_select, bool p_move_by_word = false);
	void _move_caret_start(bool p_select);
	void _move_caret_end(bool p_select);
	void _backspace(bool p_word = false, bool p_all_to_left = false);
	void _delete(bool p_word = false, bool p_all_to_right = false);

	void _ensure_menu();

protected:
	void _notification(int p_what);
	static void _bind_methods();
	virtual void gui_input(const Ref<InputEvent> &p_event) override;

	bool _set(const StringName &p_name, const Variant &p_value);
	bool _get(const StringName &p_name, Variant &r_ret) const;
	void _get_property_list(List<PropertyInfo> *p_list) const;
	void _validate_property(PropertyInfo &property) const override;

public:
	void set_align(Align p_align);
	Align get_align() const;

	virtual Variant get_drag_data(const Point2 &p_point) override;
	virtual bool can_drop_data(const Point2 &p_point, const Variant &p_data) const override;
	virtual void drop_data(const Point2 &p_point, const Variant &p_data) override;

	virtual CursorShape get_cursor_shape(const Point2 &p_pos) const override;

	void menu_option(int p_option);
	void set_context_menu_enabled(bool p_enable);
	bool is_context_menu_enabled();
	PopupMenu *get_menu() const;
	bool is_menu_visible() const;

	void select(int p_from = 0, int p_to = -1);
	void select_all();
	void selection_delete();
	void deselect();

	void delete_char();
	void delete_text(int p_from_column, int p_to_column);

	void set_text(String p_text);
	String get_text() const;

	void set_text_direction(TextDirection p_text_direction);
	TextDirection get_text_direction() const;

	void set_opentype_feature(const String &p_name, int p_value);
	int get_opentype_feature(const String &p_name) const;
	void clear_opentype_features();

	void set_language(const String &p_language);
	String get_language() const;

	void set_draw_control_chars(bool p_draw_control_chars);
	bool get_draw_control_chars() const;

	void set_structured_text_bidi_override(Control::StructuredTextParser p_parser);
	Control::StructuredTextParser get_structured_text_bidi_override() const;

	void set_structured_text_bidi_override_options(Array p_args);
	Array get_structured_text_bidi_override_options() const;

	void set_placeholder(String p_text);
	String get_placeholder() const;

	void set_placeholder_alpha(float p_alpha);
	float get_placeholder_alpha() const;

	void set_caret_column(int p_column);
	int get_caret_column() const;

	void set_max_length(int p_max_length);
	int get_max_length() const;

	void insert_text_at_caret(String p_text);
	void clear();

	void set_caret_mid_grapheme_enabled(const bool p_enabled);
	bool is_caret_mid_grapheme_enabled() const;

	bool is_caret_blink_enabled() const;
	void set_caret_blink_enabled(const bool p_enabled);

	float get_caret_blink_speed() const;
	void set_caret_blink_speed(const float p_speed);

	void set_caret_force_displayed(const bool p_enabled);
	bool is_caret_force_displayed() const;

	void copy_text();
	void cut_text();
	void paste_text();
	bool has_undo() const;
	bool has_redo() const;
	void undo();
	void redo();

	void set_editable(bool p_editable);
	bool is_editable() const;

	void set_secret(bool p_secret);
	bool is_secret() const;

	void set_secret_character(const String &p_string);
	String get_secret_character() const;

	virtual Size2 get_minimum_size() const override;

	void set_expand_to_text_length_enabled(bool p_enabled);
	bool is_expand_to_text_length_enabled() const;

	void set_clear_button_enabled(bool p_enabled);
	bool is_clear_button_enabled() const;

	void set_shortcut_keys_enabled(bool p_enabled);
	bool is_shortcut_keys_enabled() const;

	void set_virtual_keyboard_enabled(bool p_enable);
	bool is_virtual_keyboard_enabled() const;

	void set_selecting_enabled(bool p_enabled);
	bool is_selecting_enabled() const;

	void set_right_icon(const Ref<Texture2D> &p_icon);
	Ref<Texture2D> get_right_icon();

	virtual bool is_text_field() const override;

	void show_virtual_keyboard();

	LineEdit();
	~LineEdit();
};

VARIANT_ENUM_CAST(LineEdit::Align);
VARIANT_ENUM_CAST(LineEdit::MenuItems);

#endif