/*
 * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
 * Copyright (C) 2017 Furrtek
 *
 * This file is part of PortaPack.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street,
 * Boston, MA 02110-1301, USA.
 */

#include "ui.hpp"
#include "ui_widget.hpp"
#include "ui_painter.hpp"
#include "ui_menu.hpp"
#include "file.hpp"
#include "ui_navigation.hpp"
#include "ui_textentry.hpp"

namespace ui {

struct fileman_entry {
	std::filesystem::path path { };
	uint32_t size { };
	bool is_directory { };
};

enum class EmptyReason : uint8_t {
	NotEmpty,
	NoFiles,
	NoSDC
};

enum class ClipboardMode : uint8_t {
	None,
	Cut,
	Copy
};

class FileManBaseView : public View {
public:
	FileManBaseView(
		NavigationView& nav,
		std::string filter
	);

	virtual ~FileManBaseView() { }

	void focus() override;	
	std::string title() const override { return "Fileman"; };
	void push_dir(const std::filesystem::path& path);
	
protected:
	static constexpr size_t max_filename_length = 64;
	static constexpr size_t max_items_shown = 100;

	struct file_assoc_t {
		std::filesystem::path extension;
		const Bitmap* icon;
		ui::Color color;
	};
	
	const std::vector<file_assoc_t> file_types = {
		{ u".TXT", &bitmap_icon_file_text, ui::Color::white() },
		{ u".PNG", &bitmap_icon_file_image, ui::Color::green() },
		{ u".BMP", &bitmap_icon_file_image, ui::Color::green() },
		{ u".C8",  &bitmap_icon_file_iq, ui::Color::dark_cyan() },
		{ u".C16", &bitmap_icon_file_iq, ui::Color::dark_cyan() },
		{ u".WAV", &bitmap_icon_file_wav, ui::Color::dark_magenta() },
		{ u"", &bitmap_icon_file, ui::Color::light_grey() } // NB: Must be last.
	};

	std::filesystem::path get_selected_full_path() const;
	const fileman_entry& get_selected_entry() const;

	void pop_dir();
	void refresh_list();
	void reload_current();
	void load_directory_contents(const std::filesystem::path& dir_path);
	const file_assoc_t& get_assoc(const std::filesystem::path& ext) const;

	NavigationView& nav_;

	EmptyReason empty_ { EmptyReason::NotEmpty };
	std::function<void(KeyEvent)> on_select_entry { nullptr };
	std::function<void(bool)> on_refresh_widgets { nullptr };

	const std::filesystem::path parent_dir_path { u".." };
	std::filesystem::path current_path { u"" };
	std::filesystem::path extension_filter { u"" };

	std::vector<fileman_entry> entry_list { };
	std::vector<uint32_t> saved_index_stack { };
	
	Labels labels {
		{ { 0, 0 }, "Path:", Color::light_grey() }
	};

	Text text_current {
		{ 6 * 8, 0 * 8, 24 * 8, 16 },
		"",
	};
	
	MenuView menu_view {
		{ 0, 2 * 8, 240, 26 * 8 },
		true
	};

	// HACK: for item count limit.
	Text text_info {
		{ 1 * 8, 35 * 8, 15 * 8, 16 },
		""
	};
	
	Button button_exit {
		{ 21 * 8, 34 * 8, 9 * 8, 32 },
		"Exit"
	};
};

class FileLoadView : public FileManBaseView {
public:
	std::function<void(std::filesystem::path)> on_changed { };
	
	FileLoadView(NavigationView& nav, std::string filter);
	virtual ~FileLoadView() { }

private:
	void refresh_widgets(const bool v);
};

/*
// It would be nice to be able to launch FileLoadView
// but it will OOM if launched from within FileManager.
class FileSaveView : public View {
public:
	FileSaveView(
		NavigationView& nav,
		const std::filesystem::path& path,
		const std::filesystem::path& file);

	std::function<void(std::filesystem::path)> on_save { };

private:
	static constexpr size_t max_filename_length = 64;

	void refresh_widgets();

	NavigationView& nav_;
	std::filesystem::path path_;
	std::filesystem::path file_;
	std::string buffer_ { };

	Labels labels {
		{ { 0 * 8, 1 * 16 }, "Path:", Color::light_grey() },
		{ { 0 * 8, 6 * 16 }, "Filename:", Color::light_grey() },
	};

	Text text_path {
		{ 0 * 8, 2 * 16, 30 * 8, 16 },
		"",
	};

	Button button_edit_path {
		{ 18 * 8, 3 * 16, 11 * 8, 32 },
		"Edit Path"
	};

	Text text_name {
		{ 0 * 8, 7 * 16, 30 * 8, 16 },
		"",
	};

	Button button_edit_name {
		{ 18 * 8, 8 * 16, 11 * 8, 32 },
		"Edit Name"
	};

	Button button_save {
		{ 10 * 8, 16 * 16, 9 * 8, 32 },
		"Save"
	};

	Button button_cancel {
		{ 20 * 8, 16 * 16, 9 * 8, 32 },
		"Cancel"
	};
};
*/

class FileManagerView : public FileManBaseView {
public:
	FileManagerView(NavigationView& nav);
	virtual ~FileManagerView() { }

private:
	// Passed by ref to other views needing lifetime extension.
	std::string name_buffer { };
	std::filesystem::path clipboard_path { };
	ClipboardMode clipboard_mode { ClipboardMode::None }; 
	
	void refresh_widgets(const bool v);
	void on_rename();
	void on_delete();
	void on_paste();
	void on_new_dir();
	void on_new_file();

	// True if the selected entry is a real file item.
	bool selected_is_valid() const;
	
	Labels labels {
		{ { 0, 26 * 8 }, "Created ", Color::light_grey() }
	};
	
	Text text_date {
		{ 8 * 8, 26 * 8 , 19 * 8, 16 },
		""
	};

	NewButton button_rename {
		{ 0 * 8, 29 * 8, 4 * 8, 32 },
		{ },
		&bitmap_icon_rename,
		Color::dark_blue()
	};

	NewButton button_delete {
		{ 4 * 8, 29 * 8, 4 * 8, 32 },
		{ },
		&bitmap_icon_trash,
		Color::red()
	};

	NewButton button_cut {
		{ 9 * 8, 29 * 8, 4 * 8, 32 },
		{ },
		&bitmap_icon_cut,
		Color::dark_grey()
	};

	NewButton button_copy {
		{ 13 * 8, 29 * 8, 4 * 8, 32 },
		{ },
		&bitmap_icon_copy,
		Color::dark_grey()
	};

	NewButton button_paste {
		{ 17 * 8, 29 * 8, 4 * 8, 32 },
		{ },
		&bitmap_icon_paste,
		Color::dark_grey()
	};

	NewButton button_new_dir {
		{ 22 * 8, 29 * 8, 4 * 8, 32 },
		{ },
		&bitmap_icon_new_dir,
		Color::green()
	};

	NewButton button_new_file {
		{ 26 * 8, 29 * 8, 4 * 8, 32 },
		{ },
		&bitmap_icon_new_file,
		Color::green()
	};
};

} /* namespace ui */