/*************************************************************************/
/*  shader_editor_plugin.h                                               */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef SHADER_EDITOR_PLUGIN_H
#define SHADER_EDITOR_PLUGIN_H

#include "editor/code_editor.h"
#include "editor/editor_plugin.h"
#include "scene/gui/menu_button.h"
#include "scene/gui/panel_container.h"
#include "scene/gui/rich_text_label.h"
#include "scene/gui/tab_container.h"
#include "scene/gui/text_edit.h"
#include "scene/main/timer.h"
#include "scene/resources/shader.h"
#include "scene/resources/shader_include.h"
#include "servers/rendering/shader_warnings.h"

class ItemList;
class VisualShaderEditor;
class HSplitContainer;
class ShaderCreateDialog;

class GDShaderSyntaxHighlighter : public CodeHighlighter {
	GDCLASS(GDShaderSyntaxHighlighter, CodeHighlighter)

private:
	Vector<Point2i> disabled_branch_regions;
	Color disabled_branch_color;

public:
	virtual Dictionary _get_line_syntax_highlighting_impl(int p_line) override;

	void add_disabled_branch_region(const Point2i &p_region);
	void clear_disabled_branch_regions();
	void set_disabled_branch_color(const Color &p_color);
};

class ShaderTextEditor : public CodeTextEditor {
	GDCLASS(ShaderTextEditor, CodeTextEditor);

	Color marked_line_color = Color(1, 1, 1);

	struct WarningsComparator {
		_ALWAYS_INLINE_ bool operator()(const ShaderWarning &p_a, const ShaderWarning &p_b) const { return (p_a.get_line() < p_b.get_line()); }
	};

	Ref<GDShaderSyntaxHighlighter> syntax_highlighter;
	RichTextLabel *warnings_panel = nullptr;
	Ref<Shader> shader;
	Ref<ShaderInclude> shader_inc;
	List<ShaderWarning> warnings;
	Error last_compile_result = Error::OK;

	void _check_shader_mode();
	void _update_warning_panel();

	bool block_shader_changed = false;
	void _shader_changed();

	uint32_t dependencies_version = 0; // Incremented if deps changed

protected:
	void _notification(int p_what);
	static void _bind_methods();
	virtual void _load_theme_settings() override;

	virtual void _code_complete_script(const String &p_code, List<ScriptLanguage::CodeCompletionOption> *r_options) override;

public:
	void set_block_shader_changed(bool p_block) { block_shader_changed = p_block; }
	uint32_t get_dependencies_version() const { return dependencies_version; }

	virtual void _validate_script() override;

	void reload_text();
	void set_warnings_panel(RichTextLabel *p_warnings_panel);

	Ref<Shader> get_edited_shader() const;
	Ref<ShaderInclude> get_edited_shader_include() const;

	void set_edited_shader(const Ref<Shader> &p_shader);
	void set_edited_shader(const Ref<Shader> &p_shader, const String &p_code);
	void set_edited_shader_include(const Ref<ShaderInclude> &p_include);
	void set_edited_shader_include(const Ref<ShaderInclude> &p_include, const String &p_code);
	void set_edited_code(const String &p_code);

	ShaderTextEditor();
};

class ShaderEditor : public MarginContainer {
	GDCLASS(ShaderEditor, MarginContainer);

	enum {
		EDIT_UNDO,
		EDIT_REDO,
		EDIT_CUT,
		EDIT_COPY,
		EDIT_PASTE,
		EDIT_SELECT_ALL,
		EDIT_MOVE_LINE_UP,
		EDIT_MOVE_LINE_DOWN,
		EDIT_INDENT_LEFT,
		EDIT_INDENT_RIGHT,
		EDIT_DELETE_LINE,
		EDIT_DUPLICATE_SELECTION,
		EDIT_TOGGLE_COMMENT,
		EDIT_COMPLETE,
		SEARCH_FIND,
		SEARCH_FIND_NEXT,
		SEARCH_FIND_PREV,
		SEARCH_REPLACE,
		SEARCH_GOTO_LINE,
		BOOKMARK_TOGGLE,
		BOOKMARK_GOTO_NEXT,
		BOOKMARK_GOTO_PREV,
		BOOKMARK_REMOVE_ALL,
		HELP_DOCS,
	};

	MenuButton *edit_menu = nullptr;
	MenuButton *search_menu = nullptr;
	PopupMenu *bookmarks_menu = nullptr;
	MenuButton *help_menu = nullptr;
	PopupMenu *context_menu = nullptr;
	RichTextLabel *warnings_panel = nullptr;
	uint64_t idle = 0;

	GotoLineDialog *goto_line_dialog = nullptr;
	ConfirmationDialog *erase_tab_confirm = nullptr;
	ConfirmationDialog *disk_changed = nullptr;

	ShaderTextEditor *shader_editor = nullptr;
	bool compilation_success = true;

	void _menu_option(int p_option);
	mutable Ref<Shader> shader;
	mutable Ref<ShaderInclude> shader_inc;

	void _editor_settings_changed();
	void _project_settings_changed();

	void _check_for_external_edit();
	void _reload_shader_from_disk();
	void _reload_shader_include_from_disk();
	void _reload();
	void _show_warnings_panel(bool p_show);
	void _warning_clicked(Variant p_line);
	void _update_warnings(bool p_validate);

	void _script_validated(bool p_valid) {
		compilation_success = p_valid;
		emit_signal(SNAME("validation_changed"));
	}

	uint32_t dependencies_version = 0xFFFFFFFF;

protected:
	void _notification(int p_what);
	static void _bind_methods();
	void _make_context_menu(bool p_selection, Vector2 p_position);
	void _text_edit_gui_input(const Ref<InputEvent> &p_ev);

	void _update_bookmark_list();
	void _bookmark_item_pressed(int p_idx);

public:
	bool was_compilation_successful() const { return compilation_success; }
	void apply_shaders();
	void ensure_select_current();
	void edit(const Ref<Shader> &p_shader);
	void edit(const Ref<ShaderInclude> &p_shader_inc);
	void goto_line_selection(int p_line, int p_begin, int p_end);
	void save_external_data(const String &p_str = "");
	void validate_script();
	bool is_unsaved() const;

	virtual Size2 get_minimum_size() const override { return Size2(0, 200); }

	ShaderEditor();
};

class ShaderEditorPlugin : public EditorPlugin {
	GDCLASS(ShaderEditorPlugin, EditorPlugin);

	struct EditedShader {
		Ref<Shader> shader;
		Ref<ShaderInclude> shader_inc;
		ShaderEditor *shader_editor = nullptr;
		VisualShaderEditor *visual_shader_editor = nullptr;
	};

	LocalVector<EditedShader> edited_shaders;

	enum {
		FILE_NEW,
		FILE_NEW_INCLUDE,
		FILE_OPEN,
		FILE_OPEN_INCLUDE,
		FILE_SAVE,
		FILE_SAVE_AS,
		FILE_INSPECT,
		FILE_CLOSE,
		FILE_MAX
	};

	HSplitContainer *main_split = nullptr;
	ItemList *shader_list = nullptr;
	TabContainer *shader_tabs = nullptr;

	Button *button = nullptr;
	MenuButton *file_menu = nullptr;

	ShaderCreateDialog *shader_create_dialog = nullptr;

	void _update_shader_list();
	void _shader_selected(int p_index);
	void _shader_list_clicked(int p_item, Vector2 p_local_mouse_pos, MouseButton p_mouse_button_index);
	void _menu_item_pressed(int p_index);
	void _resource_saved(Object *obj);
	void _close_shader(int p_index);

	void _shader_created(Ref<Shader> p_shader);
	void _shader_include_created(Ref<ShaderInclude> p_shader_inc);
	void _update_shader_list_status();
	void _move_shader_tab(int p_from, int p_to);

	Variant get_drag_data_fw(const Point2 &p_point, Control *p_from);
	bool can_drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) const;
	void drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from);

protected:
	static void _bind_methods();

public:
	virtual void edit(Object *p_object) override;
	virtual bool handles(Object *p_object) const override;
	virtual void make_visible(bool p_visible) override;
	virtual void selected_notify() override;

	ShaderEditor *get_shader_editor(const Ref<Shader> &p_for_shader);
	VisualShaderEditor *get_visual_shader_editor(const Ref<Shader> &p_for_shader);

	virtual void save_external_data() override;
	virtual void apply_changes() override;

	ShaderEditorPlugin();
	~ShaderEditorPlugin();
};

#endif // SHADER_EDITOR_PLUGIN_H