/**************************************************************************/
/*  text_edit.h                                                           */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
/*                        https://godotengine.org                         */
/**************************************************************************/
/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
/*                                                                        */
/* Permission is hereby granted, free of charge, to any person obtaining  */
/* a copy of this software and associated documentation files (the        */
/* "Software"), to deal in the Software without restriction, including    */
/* without limitation the rights to use, copy, modify, merge, publish,    */
/* distribute, sublicense, and/or sell copies of the Software, and to     */
/* permit persons to whom the Software is furnished to do so, subject to  */
/* the following conditions:                                              */
/*                                                                        */
/* The above copyright notice and this permission notice shall be         */
/* included in all copies or substantial portions of the Software.        */
/*                                                                        */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
/**************************************************************************/

#pragma once

#include "scene/gui/control.h"
#include "scene/gui/popup_menu.h"
#include "scene/gui/scroll_bar.h"
#include "scene/main/timer.h"
#include "scene/resources/syntax_highlighter.h"
#include "scene/resources/text_paragraph.h"

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

public:
	/* Edit Actions. */
	enum EditAction {
		ACTION_NONE,
		ACTION_TYPING,
		ACTION_BACKSPACE,
		ACTION_DELETE,
	};

	/* Caret. */
	enum CaretType {
		CARET_TYPE_LINE,
		CARET_TYPE_BLOCK
	};

	/* Selection */
	enum SelectionMode {
		SELECTION_MODE_NONE,
		SELECTION_MODE_SHIFT,
		SELECTION_MODE_POINTER,
		SELECTION_MODE_WORD,
		SELECTION_MODE_LINE
	};

	/* Line Wrapping.*/
	enum LineWrappingMode {
		LINE_WRAPPING_NONE,
		LINE_WRAPPING_BOUNDARY
	};

	/* Gutters. */
	enum GutterType {
		GUTTER_TYPE_STRING,
		GUTTER_TYPE_ICON,
		GUTTER_TYPE_CUSTOM
	};

	/* Context Menu. */
	enum MenuItems {
		MENU_CUT,
		MENU_COPY,
		MENU_PASTE,
		MENU_CLEAR,
		MENU_SELECT_ALL,
		MENU_UNDO,
		MENU_REDO,
		MENU_SUBMENU_TEXT_DIR,
		MENU_DIR_INHERITED,
		MENU_DIR_AUTO,
		MENU_DIR_LTR,
		MENU_DIR_RTL,
		MENU_DISPLAY_UCC,
		MENU_SUBMENU_INSERT_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_EMOJI_AND_SYMBOL,
		MENU_MAX

	};

	/* Search. */
	enum SearchFlags {
		SEARCH_MATCH_CASE = 1,
		SEARCH_WHOLE_WORDS = 2,
		SEARCH_BACKWARDS = 4
	};

private:
	struct GutterInfo {
		GutterType type = GutterType::GUTTER_TYPE_STRING;
		String name = "";
		int width = 24;
		bool draw = true;
		bool clickable = false;
		bool overwritable = false;

		Callable custom_draw_callback;
	};

	class Text {
	public:
		struct Gutter {
			Variant metadata;
			bool clickable = false;

			Ref<Texture2D> icon;
			String text = "";
			Color color = Color(1, 1, 1);
		};

		struct Line {
			Vector<Gutter> gutters;

			String data;
			Array bidi_override;
			Ref<TextParagraph> data_buf;
			Vector<RID> accessibility_text_root_element;

			String ime_data;
			Array ime_bidi_override;

			Color background_color = Color(0, 0, 0, 0);
			bool hidden = false;
			int line_count = 0;
			int height = 0;
			int width = 0;
			float indent_ofs = -1.0;

			Line() {
				data_buf.instantiate();
			}
		};

	private:
		bool is_dirty = false;
		bool tab_size_dirty = false;

		mutable Vector<Line> text;
		Ref<Font> font;
		int font_size = -1;
		int font_height = 0;

		String language;
		TextServer::Direction direction = TextServer::DIRECTION_AUTO;
		BitField<TextServer::LineBreakFlag> brk_flags = TextServer::BREAK_MANDATORY;
		bool draw_control_chars = false;
		String custom_word_separators;
		bool use_default_word_separators = true;
		bool use_custom_word_separators = false;
		Callable inline_object_parser;

		mutable bool max_line_width_dirty = true;
		mutable bool max_line_height_dirty = true;
		mutable int max_line_width = 0;
		mutable int max_line_height = 0;
		mutable int total_visible_line_count = 0;
		int width = -1;

		int tab_size = 4;
		int gutter_count = 0;
		bool indent_wrapped_lines = false;

	public:
		void set_tab_size(int p_tab_size);
		int get_tab_size() const;
		void set_indent_wrapped_lines(bool p_enabled);
		bool is_indent_wrapped_lines() const;

		void set_font(const Ref<Font> &p_font);
		void set_font_size(int p_font_size);
		void set_direction_and_language(TextServer::Direction p_direction, const String &p_language);
		void set_draw_control_chars(bool p_enabled);
		void set_inline_object_parser(const Callable &p_parser);

		int get_line_height() const;
		int get_line_width(int p_line, int p_wrap_index = -1) const;
		int get_max_width() const;
		int get_total_visible_line_count() const;

		void set_use_default_word_separators(bool p_enabled);
		bool is_default_word_separators_enabled() const;

		void set_use_custom_word_separators(bool p_enabled);
		bool is_custom_word_separators_enabled() const;

		void set_custom_word_separators(const String &p_separators);
		String get_enabled_word_separators() const;
		String get_custom_word_separators() const;
		String get_default_word_separators() const;

		void set_width(float p_width);
		float get_width() const;
		void set_brk_flags(BitField<TextServer::LineBreakFlag> p_flags);
		BitField<TextServer::LineBreakFlag> get_brk_flags() const;
		int get_line_wrap_amount(int p_line) const;

		const Vector<RID> get_accessibility_elements(int p_line);
		void update_accessibility(int p_line, RID p_root);
		void clear_accessibility() {
			for (int i = 0; i < text.size(); i++) {
				text.write[i].accessibility_text_root_element.clear();
			}
		}

		Vector<Vector2i> get_line_wrap_ranges(int p_line) const;
		const Ref<TextParagraph> get_line_data(int p_line) const;
		float get_indent_offset(int p_line, bool p_rtl) const;

		void set(int p_line, const String &p_text, const Array &p_bidi_override);
		void set_ime(int p_line, const String &p_text, const Array &p_bidi_override);
		void set_hidden(int p_line, bool p_hidden);
		bool is_hidden(int p_line) const;
		void insert(int p_at, const Vector<String> &p_text, const Vector<Array> &p_bidi_override);
		void remove_range(int p_from_line, int p_to_line);
		int size() const { return text.size(); }
		void clear();

		void invalidate_cache(int p_line, bool p_text_changed = false);
		void invalidate_font();
		void invalidate_all();
		void invalidate_all_lines();

		_FORCE_INLINE_ const String &operator[](int p_line) const;
		_FORCE_INLINE_ const String &get_text_with_ime(int p_line) const;

		/* Gutters. */
		void add_gutter(int p_at);
		void remove_gutter(int p_gutter);
		void move_gutters(int p_from_line, int p_to_line);

		void set_line_gutter_metadata(int p_line, int p_gutter, const Variant &p_metadata) { text.write[p_line].gutters.write[p_gutter].metadata = p_metadata; }
		const Variant &get_line_gutter_metadata(int p_line, int p_gutter) const { return text[p_line].gutters[p_gutter].metadata; }

		void set_line_gutter_text(int p_line, int p_gutter, const String &p_text) { text.write[p_line].gutters.write[p_gutter].text = p_text; }
		const String &get_line_gutter_text(int p_line, int p_gutter) const { return text[p_line].gutters[p_gutter].text; }

		void set_line_gutter_icon(int p_line, int p_gutter, const Ref<Texture2D> &p_icon) { text.write[p_line].gutters.write[p_gutter].icon = p_icon; }
		const Ref<Texture2D> &get_line_gutter_icon(int p_line, int p_gutter) const { return text[p_line].gutters[p_gutter].icon; }

		void set_line_gutter_item_color(int p_line, int p_gutter, const Color &p_color) { text.write[p_line].gutters.write[p_gutter].color = p_color; }
		const Color &get_line_gutter_item_color(int p_line, int p_gutter) const { return text[p_line].gutters[p_gutter].color; }

		void set_line_gutter_clickable(int p_line, int p_gutter, bool p_clickable) { text.write[p_line].gutters.write[p_gutter].clickable = p_clickable; }
		bool is_line_gutter_clickable(int p_line, int p_gutter) const { return text[p_line].gutters[p_gutter].clickable; }

		/* Line style. */
		void set_line_background_color(int p_line, const Color &p_color) { text.write[p_line].background_color = p_color; }
		const Color get_line_background_color(int p_line) const { return text[p_line].background_color; }
	};

	/* Text */
	Text text;
	RID text_ci;
	bool setting_text = false;

	enum AltInputMode {
		ALT_INPUT_NONE,
		ALT_INPUT_UNICODE,
		ALT_INPUT_OEM,
		ALT_INPUT_WIN,
	};

	AltInputMode alt_mode = ALT_INPUT_NONE;
	bool alt_start = false;
	bool alt_start_no_hold = false;
	uint32_t alt_code = 0;

	bool tab_input_mode = true;

	// Text properties.
	String ime_text = "";
	Point2 ime_selection;

	// Placeholder
	String placeholder_text = "";
	Array placeholder_bidi_override;
	Ref<TextParagraph> placeholder_data_buf;
	int placeholder_line_height = -1;
	int placeholder_max_width = -1;

	Vector<String> placeholder_wrapped_rows;

	void _update_placeholder();
	bool _using_placeholder() const;

	/* Initialize to opposite first, so we get past the early-out in set_editable. */
	bool editable = false;

	TextDirection text_direction = TEXT_DIRECTION_AUTO;
	TextDirection input_direction = TEXT_DIRECTION_LTR;

	String language = "";

	TextServer::StructuredTextParser st_parser = TextServer::STRUCTURED_TEXT_DEFAULT;
	Array st_args;

	void _clear();
	void _update_caches(bool p_invalidate_all = false);

	void _close_ime_window();
	void _update_ime_window_position();
	void _update_ime_text();

	// User control.
	bool overtype_mode = false;
	bool context_menu_enabled = true;
	bool emoji_menu_enabled = true;
	bool backspace_deletes_composite_character_enabled = false;
	bool shortcut_keys_enabled = true;
	bool virtual_keyboard_enabled = true;
	bool virtual_keyboard_show_on_focus = true;
	bool middle_mouse_paste_enabled = true;
	bool empty_selection_clipboard_enabled = true;

	// Overridable actions.
	String cut_copy_line = "";

	// Context menu.
	PopupMenu *menu = nullptr;
	PopupMenu *menu_dir = nullptr;
	PopupMenu *menu_ctl = nullptr;

	Callable inline_object_drawer;
	Callable inline_object_click_handler;

	Key _get_menu_action_accelerator(const String &p_action);
	void _generate_context_menu();
	void _update_context_menu();

	/* Versioning */
	struct Caret;
	struct TextOperation {
		enum Type {
			TYPE_NONE,
			TYPE_INSERT,
			TYPE_REMOVE
		};
		Vector<Caret> start_carets;
		Vector<Caret> end_carets;

		Type type = TYPE_NONE;
		int from_line = 0;
		int from_column = 0;
		int to_line = 0;
		int to_column = 0;
		String text;
		uint32_t prev_version = 0;
		uint32_t version = 0;
		bool chain_forward = false;
		bool chain_backward = false;
	};

	bool undo_enabled = true;
	int undo_stack_max_size = 50;

	EditAction current_action = EditAction::ACTION_NONE;
	bool pending_action_end = false;
	bool in_action = false;

	int complex_operation_count = 0;
	bool next_operation_is_complex = false;

	TextOperation current_op;
	List<TextOperation> undo_stack;
	List<TextOperation>::Element *undo_stack_pos = nullptr;

	Timer *idle_detect = nullptr;

	uint32_t version = 0;
	uint32_t saved_version = 0;

	void _push_current_op();
	void _do_text_op(const TextOperation &p_op, bool p_reverse);
	void _clear_redo();

	/* Search */
	String search_text = "";
	uint32_t search_flags = 0;

	int _get_column_pos_of_word(const String &p_key, const String &p_search, uint32_t p_search_flags, int p_from_column) const;

	/* Tooltip. */
	Callable tooltip_callback;

	/* Mouse */
	struct LineDrawingCache {
		int y_offset = 0;
		Vector<int> first_visible_chars;
		Vector<int> last_visible_chars;
	};

	HashMap<int, LineDrawingCache> line_drawing_cache;

	int _get_char_pos_for_line(int p_px, int p_line, int p_wrap_index = 0) const;

	/* Caret. */
	struct Selection {
		bool active = false;

		int origin_line = 0;
		int origin_column = 0;
		int origin_last_fit_x = 0;
		int word_begin_column = 0;
		int word_end_column = 0;
	};

	struct Caret {
		Selection selection;

		Point2 draw_pos;
		bool visible = false;
		int last_fit_x = 0;
		int line = 0;
		int column = 0;
	};

	// Vector containing all the carets, index '0' is the "main caret" and should never be removed.
	Vector<Caret> carets;

	bool setting_caret_line = false;
	bool caret_pos_dirty = false;
	void _set_caret_pos_dirty(bool p_dirty);

	int multicaret_edit_count = 0;
	bool multicaret_edit_merge_queued = false;
	HashSet<int> multicaret_edit_ignore_carets;

	CaretType caret_type = CaretType::CARET_TYPE_LINE;

	bool draw_caret = true;
	bool draw_caret_when_editable_disabled = false;

	bool caret_blink_enabled = false;
	Timer *caret_blink_timer = nullptr;

	bool move_caret_on_right_click = true;

	bool caret_mid_grapheme_enabled = false;

	bool multi_carets_enabled = true;

	bool drag_action = false;
	bool drag_caret_force_displayed = false;

	void _caret_changed(int p_caret = -1);
	void _emit_caret_changed();

	void _show_virtual_keyboard();
	void _reset_caret_blink_timer();
	void _toggle_draw_caret();

	int _get_column_x_offset_for_line(int p_char, int p_line, int p_column) const;
	bool _is_line_col_in_range(int p_line, int p_column, int p_from_line, int p_from_column, int p_to_line, int p_to_column, bool p_include_edges = true) const;

	void _offset_carets_after(int p_old_line, int p_old_column, int p_new_line, int p_new_column, bool p_include_selection_begin = true, bool p_include_selection_end = true);

	void _cancel_drag_and_drop_text();

	/* Selection. */
	SelectionMode selecting_mode = SelectionMode::SELECTION_MODE_NONE;

	bool selecting_enabled = true;
	bool deselect_on_focus_loss_enabled = true;
	bool drag_and_drop_selection_enabled = true;

	bool use_selected_font_color = false;

	bool selection_drag_attempt = false;
	bool dragging_selection = false;
	int drag_and_drop_origin_caret_index = -1;
	int drag_caret_index = -1;

	Timer *click_select_held = nullptr;
	uint64_t last_dblclk = 0;
	Vector2 last_dblclk_pos;

	void _selection_changed(int p_caret = -1);
	void _click_selection_held();

	void _update_selection_mode_pointer(bool p_initial = false);
	void _update_selection_mode_word(bool p_initial = false);
	void _update_selection_mode_line(bool p_initial = false);

	void _pre_shift_selection(int p_caret);

	bool _selection_contains(int p_caret, int p_line, int p_column, bool p_include_edges = true, bool p_only_selections = true) const;

	/* Line wrapping. */
	LineWrappingMode line_wrapping_mode = LineWrappingMode::LINE_WRAPPING_NONE;
	TextServer::AutowrapMode autowrap_mode = TextServer::AUTOWRAP_WORD_SMART;

	int wrap_at_column = 0;

	void _update_wrap_at_column(bool p_force = false);

	/* Viewport. */
	HScrollBar *h_scroll = nullptr;
	VScrollBar *v_scroll = nullptr;

	Vector2i content_size_cache;
	bool fit_content_height = false;
	bool fit_content_width = false;
	bool scroll_past_end_of_file_enabled = false;

	// Smooth scrolling.
	bool smooth_scroll_enabled = false;
	float target_v_scroll = 0.0;
	float v_scroll_speed = 80.0;

	// Scrolling.
	int first_visible_line = 0;
	int first_visible_line_wrap_ofs = 0;
	int first_visible_col = 0;

	bool scrolling = false;
	bool updating_scrolls = false;

	void _update_scrollbars();
	int _get_control_height() const;

	void _v_scroll_input();
	void _scroll_moved(double p_to_val);

	double _get_visible_lines_offset() const;
	double _get_v_scroll_offset() const;

	void _scroll_up(real_t p_delta, bool p_animate);
	void _scroll_down(real_t p_delta, bool p_animate);

	void _scroll_lines_up();
	void _scroll_lines_down();

	void _adjust_viewport_to_caret_horizontally(int p_caret = 0, bool p_maximize_selection = true);

	// Minimap.
	bool draw_minimap = false;

	int minimap_width = 80;
	Point2 minimap_char_size = Point2(1, 2);
	int minimap_line_spacing = 1;

	// Minimap scroll.
	bool minimap_clicked = false;
	bool hovering_minimap = false;
	bool dragging_minimap = false;
	bool can_drag_minimap = false;

	double minimap_scroll_ratio = 0.0;
	double minimap_scroll_click_pos = 0.0;

	void _update_minimap_hover();
	void _update_minimap_click();
	void _update_minimap_drag();

	/* Gutters. */
	Vector<GutterInfo> gutters;
	int gutters_width = 0;
	int gutter_padding = 0;
	Vector2i hovered_gutter = Vector2i(-1, -1); // X = gutter index, Y = row.

	void _update_gutter_width();
	Vector2i _get_hovered_gutter(const Point2 &p_mouse_pos) const;

	/* Syntax highlighting. */
	Ref<SyntaxHighlighter> syntax_highlighter;
	HashMap<int, Vector<Pair<int64_t, Color>>> syntax_highlighting_cache;

	Vector<Pair<int64_t, Color>> _get_line_syntax_highlighting(int p_line);
	void _clear_syntax_highlighting_cache();
	void _syntax_highlighter_changed();

	/* Visual. */
	struct ThemeCache {
		float base_scale = 1.0;

		/* Search */
		Color search_result_color = Color(1, 1, 1);
		Color search_result_border_color = Color(1, 1, 1);

		/* Caret */
		int caret_width = 1;
		Color caret_color = Color(1, 1, 1);
		Color caret_background_color = Color(0, 0, 0);

		/* Selection */
		Color font_selected_color = Color(0, 0, 0, 0);
		Color selection_color = Color(1, 1, 1);

		/* Other visuals */
		Ref<StyleBox> style_normal;
		Ref<StyleBox> style_focus;
		Ref<StyleBox> style_readonly;

		Ref<Texture2D> tab_icon;
		Ref<Texture2D> space_icon;

		Ref<Font> font;
		int font_size = 16;
		Color font_color = Color(1, 1, 1);
		Color font_readonly_color = Color(1, 1, 1);
		Color font_placeholder_color = Color(1, 1, 1, 0.6);

		int outline_size = 0;
		Color outline_color = Color(1, 1, 1);

		int line_spacing = 1;
		int wrap_offset = 10;

		Color current_line_color = Color(1, 1, 1);
		Color word_highlighted_color = Color(1, 1, 1);

#ifndef DISABLE_DEPRECATED
		Color background_color = Color(1, 1, 1);
#endif // DISABLE_DEPRECATED
	} theme_cache;

	bool window_has_focus = true;
	bool first_draw = true;

	bool highlight_current_line = false;
	bool highlight_all_occurrences = false;
	bool draw_control_chars = false;
	bool draw_tabs = false;
	bool draw_spaces = false;

	// FIXME: Helper method to draw unfilled rects, should be moved to RenderingServer.
	void _draw_rect_unfilled(RID p_canvas_item, const Rect2 &p_rect, const Color &p_color, real_t p_width = -1.0, bool p_antialiased = false) const;

	/* Theme. */
	Ref<StyleBox> _get_current_stylebox() const;

	/*** Super internal Core API. Everything builds on it. ***/
	bool text_changed_dirty = false;
	void _text_changed();
	void _emit_text_changed();

	void _insert_text(int p_line, int p_char, const String &p_text, int *r_end_line = nullptr, int *r_end_char = nullptr);
	void _remove_text(int p_from_line, int p_from_column, int p_to_line, int p_to_column);

	void _base_insert_text(int p_line, int p_char, const String &p_text, int &r_end_line, int &r_end_column);
	String _base_get_text(int p_from_line, int p_from_column, int p_to_line, int p_to_column) const;
	void _base_remove_text(int p_from_line, int p_from_column, int p_to_line, int p_to_column);

	/* Input actions. */
	void _swap_current_input_direction();
	void _new_line(bool p_split_current = true, bool p_above = false);
	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_up(bool p_select);
	void _move_caret_down(bool p_select);
	void _move_caret_to_line_start(bool p_select);
	void _move_caret_to_line_end(bool p_select);
	void _move_caret_page_up(bool p_select);
	void _move_caret_page_down(bool p_select);
	void _do_backspace(bool p_word = false, bool p_all_to_left = false);
	void _delete(bool p_word = false, bool p_all_to_right = false);
	void _move_caret_document_start(bool p_select);
	void _move_caret_document_end(bool p_select);
	bool _clear_carets_and_selection();

protected:
	void _notification(int p_what);
	static void _bind_methods();

#ifndef DISABLE_DEPRECATED
	void _set_selection_mode_compat_86978(SelectionMode p_mode, int p_line = -1, int p_column = -1, int p_caret = 0);
	Point2i _get_line_column_at_pos_bind_compat_100913(const Point2i &p_pos, bool p_allow_out_of_bounds = true) const;
	static void _bind_compatibility_methods();
#endif // DISABLE_DEPRECATED

	virtual void _draw_guidelines() {}
	virtual void _update_theme_item_cache() override;

	virtual String _get_accessibility_name() const override;

	/* Internal API for CodeEdit, pending public API. */
	// Brace matching.
	struct BraceMatchingData {
		int open_match_line = -1;
		int open_match_column = -1;
		bool open_matching = false;
		bool open_mismatch = false;
		int close_match_line = -1;
		int close_match_column = -1;
		bool close_matching = false;
		bool close_mismatch = false;
	};

	bool highlight_matching_braces_enabled = false;

	// Line hiding.
	bool hiding_enabled = false;

	void _set_hiding_enabled(bool p_enabled);
	bool _is_hiding_enabled() const;

	void _set_line_as_hidden(int p_line, bool p_hidden);
	bool _is_line_hidden(int p_line) const;

	void _unhide_all_lines();
	virtual void _unhide_carets();

	int _get_wrapped_indent_level(int p_line, int &r_first_wrap) const;
	float _get_wrap_indent_offset(int p_line, int p_wrap_index, bool p_rtl) const;

	// Symbol lookup.
	String lookup_symbol_word;
	void _set_symbol_lookup_word(const String &p_symbol);

	// Theme items.
	virtual Color _get_brace_mismatch_color() const { return Color(); }
	virtual Color _get_code_folding_color() const { return Color(); }
	virtual Ref<Texture2D> _get_folded_eol_icon() const { return Ref<Texture2D>(); }

	/* Text manipulation */

	// Overridable actions
	virtual void _handle_unicode_input_internal(const uint32_t p_unicode, int p_caret);
	virtual void _backspace_internal(int p_caret);

	virtual void _cut_internal(int p_caret);
	virtual void _copy_internal(int p_caret);
	virtual void _paste_internal(int p_caret);
	virtual void _paste_primary_clipboard_internal(int p_caret);

	void _accessibility_action_set_selection(const Variant &p_data);
	void _accessibility_action_replace_selected(const Variant &p_data);
	void _accessibility_action_set_value(const Variant &p_data);
	void _accessibility_action_menu(const Variant &p_data);
	void _accessibility_scroll_down(const Variant &p_data);
	void _accessibility_scroll_left(const Variant &p_data);
	void _accessibility_scroll_right(const Variant &p_data);
	void _accessibility_scroll_up(const Variant &p_data);
	void _accessibility_scroll_set(const Variant &p_data);
	void _accessibility_action_scroll_into_view(const Variant &p_data, int p_line, int p_wrap);

	GDVIRTUAL2(_handle_unicode_input, int, int)
	GDVIRTUAL1(_backspace, int)
	GDVIRTUAL1(_cut, int)
	GDVIRTUAL1(_copy, int)
	GDVIRTUAL1(_paste, int)
	GDVIRTUAL1(_paste_primary_clipboard, int)

public:
	/* General overrides. */
	virtual void unhandled_key_input(const Ref<InputEvent> &p_event) override;
	virtual void gui_input(const Ref<InputEvent> &p_gui_input) override;
	bool alt_input(const Ref<InputEvent> &p_gui_input);
	virtual Size2 get_minimum_size() const override;
	virtual bool is_text_field() const override;
	virtual CursorShape get_cursor_shape(const Point2 &p_pos = Point2i()) const override;
	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 String get_tooltip(const Point2 &p_pos) const override;
	void set_tooltip_request_func(const Callable &p_tooltip_callback);

	/* Text */
	// Text properties.
	RID get_text_canvas_item() const;

	bool has_ime_text() const;
	void cancel_ime();
	void apply_ime();

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

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

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

	void set_structured_text_bidi_override(TextServer::StructuredTextParser p_parser);
	TextServer::StructuredTextParser get_structured_text_bidi_override() const;
	void set_structured_text_bidi_override_options(const Array &p_args);
	Array get_structured_text_bidi_override_options() const;

	void set_tab_size(const int p_size);
	int get_tab_size() const;

	void set_indent_wrapped_lines(bool p_enabled);
	bool is_indent_wrapped_lines() const;

	void set_tab_input_mode(bool p_enabled);
	bool get_tab_input_mode() const;

	// User controls
	void set_overtype_mode_enabled(bool p_enabled);
	bool is_overtype_mode_enabled() const;

	void set_context_menu_enabled(bool p_enabled);
	bool is_context_menu_enabled() const;

	void show_emoji_and_symbol_picker();

	void set_emoji_menu_enabled(bool p_enabled);
	bool is_emoji_menu_enabled() const;

	void set_backspace_deletes_composite_character_enabled(bool p_enabled);
	bool is_backspace_deletes_composite_character_enabled() const;

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

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

	void set_virtual_keyboard_show_on_focus(bool p_show_on_focus);
	bool get_virtual_keyboard_show_on_focus() const;

	void set_middle_mouse_paste_enabled(bool p_enabled);
	bool is_middle_mouse_paste_enabled() const;

	void set_empty_selection_clipboard_enabled(bool p_enabled);
	bool is_empty_selection_clipboard_enabled() const;

	// Text manipulation
	void clear();

	void _set_text(const String &p_text, bool p_emit_signal = false);
	void set_text(const String &p_text);
	String get_text() const;

	int get_line_count() const;

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

	void set_line(int p_line, const String &p_new_text);
	String get_line(int p_line) const;
	String get_line_with_ime(int p_line) const;

	int get_line_width(int p_line, int p_wrap_index = -1) const;
	int get_line_height() const;

	int get_indent_level(int p_line) const;
	int get_first_non_whitespace_column(int p_line) const;

	void swap_lines(int p_from_line, int p_to_line);

	void insert_line_at(int p_line, const String &p_text);
	void remove_line_at(int p_line, bool p_move_carets_down = true);

	void insert_text_at_caret(const String &p_text, int p_caret = -1);
	void insert_text(const String &p_text, int p_line, int p_column, bool p_before_selection_begin = true, bool p_before_selection_end = false);
	void remove_text(int p_from_line, int p_from_column, int p_to_line, int p_to_column);

	int get_last_unhidden_line() const;
	int get_next_visible_line_offset_from(int p_line_from, int p_visible_amount) const;
	Point2i get_next_visible_line_index_offset_from(int p_line_from, int p_wrap_index_from, int p_visible_amount) const;

	void set_inline_object_handlers(const Callable &p_parser, const Callable &p_drawer, const Callable &p_click_handler);

	// Overridable actions
	void handle_unicode_input(const uint32_t p_unicode, int p_caret = -1);
	void backspace(int p_caret = -1);

	void cut(int p_caret = -1);
	void copy(int p_caret = -1);
	void paste(int p_caret = -1);
	void paste_primary_clipboard(int p_caret = -1);

	// Context menu.
	PopupMenu *get_menu() const;
	bool is_menu_visible() const;
	void menu_option(int p_option);

	/* Versioning */
	void start_action(EditAction p_action);
	void end_action();
	EditAction get_current_action() const;

	void begin_complex_operation();
	void end_complex_operation();

	bool has_undo() const;
	bool has_redo() const;
	void undo();
	void redo();
	void clear_undo_history();

	bool is_insert_text_operation() const;

	void tag_saved_version();

	uint32_t get_version() const;
	uint32_t get_saved_version() const;

	/* Search */
	void set_search_text(const String &p_search_text);
	void set_search_flags(uint32_t p_flags);

	Point2i search(const String &p_key, uint32_t p_search_flags, int p_from_line, int p_from_column) const;

	/* Mouse */
	Point2 get_local_mouse_pos() const;

	String get_word_at_pos(const Vector2 &p_pos) const;
	String get_word(int p_line, int p_column) const;

	Point2i get_line_column_at_pos(const Point2i &p_pos, bool p_clamp_line = true, bool p_clamp_column = true) const;
	Point2i get_pos_at_line_column(int p_line, int p_column) const;
	Rect2i get_rect_at_line_column(int p_line, int p_column) const;
	int get_line_start_margin() const;

	int get_minimap_line_at_pos(const Point2i &p_pos) const;

	bool is_dragging_cursor() const;
	bool is_mouse_over_selection(bool p_edges = true, int p_caret = -1) const;

	/* Caret */
	void set_caret_type(CaretType p_type);
	CaretType get_caret_type() const;

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

	void set_caret_blink_interval(const float p_interval);
	float get_caret_blink_interval() const;

	void set_draw_caret_when_editable_disabled(bool p_enable);
	bool is_drawing_caret_when_editable_disabled() const;

	void set_move_caret_on_right_click_enabled(bool p_enabled);
	bool is_move_caret_on_right_click_enabled() const;

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

	void set_multiple_carets_enabled(bool p_enabled);
	bool is_multiple_carets_enabled() const;

	int add_caret(int p_line, int p_column);
	void remove_caret(int p_caret);
	void remove_drag_caret();
	void remove_secondary_carets();
	int get_caret_count() const;
	void add_caret_at_carets(bool p_below);

	Vector<int> get_sorted_carets(bool p_include_ignored_carets = false) const;
	void collapse_carets(int p_from_line, int p_from_column, int p_to_line, int p_to_column, bool p_inclusive = false);

	void merge_overlapping_carets();
	void begin_multicaret_edit();
	void end_multicaret_edit();
	bool is_in_mulitcaret_edit() const;
	bool multicaret_edit_ignore_caret(int p_caret) const;

	bool is_caret_visible(int p_caret = 0) const;
	Point2 get_caret_draw_pos(int p_caret = 0) const;

	void set_caret_line(int p_line, bool p_adjust_viewport = true, bool p_can_be_hidden = true, int p_wrap_index = 0, int p_caret = 0);
	int get_caret_line(int p_caret = 0) const;

	void set_caret_column(int p_column, bool p_adjust_viewport = true, int p_caret = 0);
	int get_caret_column(int p_caret = 0) const;
	int get_next_composite_character_column(int p_line, int p_column) const;
	int get_previous_composite_character_column(int p_line, int p_column) const;

	int get_caret_wrap_index(int p_caret = 0) const;

	String get_word_under_caret(int p_caret = -1) const;

	/* Selection. */
	void set_selecting_enabled(bool p_enabled);
	bool is_selecting_enabled() const;

	void set_deselect_on_focus_loss_enabled(bool p_enabled);
	bool is_deselect_on_focus_loss_enabled() const;

	void set_drag_and_drop_selection_enabled(bool p_enabled);
	bool is_drag_and_drop_selection_enabled() const;

	void set_selection_mode(SelectionMode p_mode);
	SelectionMode get_selection_mode() const;

	void select_all();
	void select_word_under_caret(int p_caret = -1);
	void add_selection_for_next_occurrence();
	void skip_selection_for_next_occurrence();
	void select(int p_origin_line, int p_origin_column, int p_caret_line, int p_caret_column, int p_caret = 0);

	bool has_selection(int p_caret = -1) const;

	String get_selected_text(int p_caret = -1);
	int get_selection_at_line_column(int p_line, int p_column, bool p_include_edges = true, bool p_only_selections = true) const;
	Vector<Point2i> get_line_ranges_from_carets(bool p_only_selections = false, bool p_merge_adjacent = true) const;
	TypedArray<Vector2i> get_line_ranges_from_carets_typed_array(bool p_only_selections = false, bool p_merge_adjacent = true) const;

	void set_selection_origin_line(int p_line, bool p_can_be_hidden = true, int p_wrap_index = -1, int p_caret = 0);
	void set_selection_origin_column(int p_column, int p_caret = 0);
	int get_selection_origin_line(int p_caret = 0) const;
	int get_selection_origin_column(int p_caret = 0) const;

	int get_selection_from_line(int p_caret = 0) const;
	int get_selection_from_column(int p_caret = 0) const;
	int get_selection_to_line(int p_caret = 0) const;
	int get_selection_to_column(int p_caret = 0) const;

	bool is_caret_after_selection_origin(int p_caret = 0) const;

	void deselect(int p_caret = -1);
	void delete_selection(int p_caret = -1);

	/* Line wrapping. */
	void set_line_wrapping_mode(LineWrappingMode p_wrapping_mode);
	LineWrappingMode get_line_wrapping_mode() const;

	void set_autowrap_mode(TextServer::AutowrapMode p_mode);
	TextServer::AutowrapMode get_autowrap_mode() const;

	bool is_line_wrapped(int p_line) const;
	int get_line_wrap_count(int p_line) const;
	int get_line_wrap_index_at_column(int p_line, int p_column) const;

	Vector<String> get_line_wrapped_text(int p_line) const;

	/* Viewport. */
	// Scrolling.
	void set_smooth_scroll_enabled(bool p_enabled);
	bool is_smooth_scroll_enabled() const;

	void set_scroll_past_end_of_file_enabled(bool p_enabled);
	bool is_scroll_past_end_of_file_enabled() const;

	VScrollBar *get_v_scroll_bar() const;
	HScrollBar *get_h_scroll_bar() const;

	void set_v_scroll(double p_scroll);
	double get_v_scroll() const;

	void set_h_scroll(int p_scroll);
	int get_h_scroll() const;

	void set_v_scroll_speed(float p_speed);
	float get_v_scroll_speed() const;

	void set_fit_content_height_enabled(bool p_enabled);
	bool is_fit_content_height_enabled() const;

	void set_fit_content_width_enabled(bool p_enabled);
	bool is_fit_content_width_enabled() const;

	double get_scroll_pos_for_line(int p_line, int p_wrap_index = 0) const;

	// Visible lines.
	void set_line_as_first_visible(int p_line, int p_wrap_index = 0);
	int get_first_visible_line() const;

	void set_line_as_center_visible(int p_line, int p_wrap_index = 0);

	void set_line_as_last_visible(int p_line, int p_wrap_index = 0);
	int get_last_full_visible_line() const;
	int get_last_full_visible_line_wrap_index() const;

	int get_visible_line_count() const;
	int get_visible_line_count_in_range(int p_from, int p_to) const;
	int get_total_visible_line_count() const;

	// Auto Adjust
	bool is_line_in_viewport(int p_line) const;
	void adjust_viewport_to_caret(int p_caret = 0);
	void center_viewport_to_caret(int p_caret = 0);

	// Minimap
	void set_draw_minimap(bool p_enabled);
	bool is_drawing_minimap() const;

	void set_minimap_width(int p_minimap_width);
	int get_minimap_width() const;

	int get_minimap_visible_lines() const;

	/* Gutters. */
	void add_gutter(int p_at = -1);
	void remove_gutter(int p_gutter);
	int get_gutter_count() const;
	Vector2i get_hovered_gutter() const { return hovered_gutter; }

	void set_gutter_name(int p_gutter, const String &p_name);
	String get_gutter_name(int p_gutter) const;

	void set_gutter_type(int p_gutter, GutterType p_type);
	GutterType get_gutter_type(int p_gutter) const;

	void set_gutter_width(int p_gutter, int p_width);
	int get_gutter_width(int p_gutter) const;
	int get_total_gutter_width() const;

	void set_gutter_draw(int p_gutter, bool p_draw);
	bool is_gutter_drawn(int p_gutter) const;

	void set_gutter_clickable(int p_gutter, bool p_clickable);
	bool is_gutter_clickable(int p_gutter) const;

	void set_gutter_overwritable(int p_gutter, bool p_overwritable);
	bool is_gutter_overwritable(int p_gutter) const;

	void merge_gutters(int p_from_line, int p_to_line);

	void set_gutter_custom_draw(int p_gutter, const Callable &p_draw_callback);

	// Line gutters.
	void set_line_gutter_metadata(int p_line, int p_gutter, const Variant &p_metadata);
	Variant get_line_gutter_metadata(int p_line, int p_gutter) const;

	void set_line_gutter_text(int p_line, int p_gutter, const String &p_text);
	String get_line_gutter_text(int p_line, int p_gutter) const;

	void set_line_gutter_icon(int p_line, int p_gutter, const Ref<Texture2D> &p_icon);
	Ref<Texture2D> get_line_gutter_icon(int p_line, int p_gutter) const;

	void set_line_gutter_item_color(int p_line, int p_gutter, const Color &p_color);
	Color get_line_gutter_item_color(int p_line, int p_gutter) const;

	void set_line_gutter_clickable(int p_line, int p_gutter, bool p_clickable);
	bool is_line_gutter_clickable(int p_line, int p_gutter) const;

	// Line style
	void set_line_background_color(int p_line, const Color &p_color);
	Color get_line_background_color(int p_line) const;

	/* Syntax Highlighting. */
	void set_syntax_highlighter(Ref<SyntaxHighlighter> p_syntax_highlighter);
	Ref<SyntaxHighlighter> get_syntax_highlighter() const;

	/* Visual. */
	void set_highlight_current_line(bool p_enabled);
	bool is_highlight_current_line_enabled() const;

	void set_highlight_all_occurrences(bool p_enabled);
	bool is_highlight_all_occurrences_enabled() const;

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

	void set_draw_tabs(bool p_enabled);
	bool is_drawing_tabs() const;

	void set_draw_spaces(bool p_enabled);
	bool is_drawing_spaces() const;

	Color get_font_color() const;

	/* Behavior */

	String get_default_word_separators() const;

	void set_use_default_word_separators(bool p_enabled);
	bool is_default_word_separators_enabled() const;

	void set_custom_word_separators(const String &p_separators);
	void set_use_custom_word_separators(bool p_enabled);
	bool is_custom_word_separators_enabled() const;

	String get_custom_word_separators() const;

	/* Deprecated. */
#ifndef DISABLE_DEPRECATED
	Vector<int> get_caret_index_edit_order();
	void adjust_carets_after_edit(int p_caret, int p_from_line, int p_from_col, int p_to_line, int p_to_col);

	int get_selection_line(int p_caret = 0) const;
	int get_selection_column(int p_caret = 0) const;
#endif

	TextEdit(const String &p_placeholder = String());
	~TextEdit();
};

VARIANT_ENUM_CAST(TextEdit::EditAction);
VARIANT_ENUM_CAST(TextEdit::CaretType);
VARIANT_ENUM_CAST(TextEdit::LineWrappingMode);
VARIANT_ENUM_CAST(TextEdit::SelectionMode);
VARIANT_ENUM_CAST(TextEdit::GutterType);
VARIANT_ENUM_CAST(TextEdit::MenuItems);
VARIANT_ENUM_CAST(TextEdit::SearchFlags);
