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/*
   client/savegamemenu.cc
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2
*/

#include "client/savegamemenu.h"
#include "client/closeiconbutton.h"
#include "client/video.h"

#include "ui/ui.h"

#include "model/material.h"

#include "render/screenshot.h"
#include "render/camera.h"
#include "render/draw.h"
#include "render/textures.h"
#include "render/gl.h"

#include "filesystem/filesystem.h"

#include "core/application.h"
#include "core/gameinterface.h"
#include "core/gameserver.h"

#include "sys/sys.h"

#include <iomanip>
#include <cstdio>

namespace client
{

SaveGameMenu::SaveGameMenu(ui::Widget *parent, const char *label, const Mode mode) : 
	ui::Window(parent)
{
	set_label(label);
	set_border(true);
	set_background(true);
	set_font(ui::root()->font_small());
	
	savegamemenu_mode = mode;
	
	// window title
	savegamemenu_titlelabel = new ui::Label(this);
	savegamemenu_titlelabel->set_label("title");
	savegamemenu_titlelabel->set_background(false);
	savegamemenu_titlelabel->set_border(false);
	savegamemenu_titlelabel->set_font(ui::root()->font_large());
	savegamemenu_titlelabel->set_alignment(ui::AlignCenter);
	if (savegamemenu_mode == Save) {
		savegamemenu_titlelabel->set_text("SAVE GAME");
	} else {
		savegamemenu_titlelabel->set_text("LOAD GAME");
	}
	
	// close button
	savegamemenu_closebutton = new CloseIconButton(savegamemenu_titlelabel);
		
	// file listview
	savegamemenu_filelistview = new ui::ListView(this);
	savegamemenu_filelistview->set_label("files");
	
	// savegame screenshot
	savegamemenu_screenshot = new ui::Bitmap(this);
	savegamemenu_screenshot->set_background(true);
	savegamemenu_screenshot->set_border(true);
	
	// savegame description title
	savegamemenu_descrtitle = new ui::Label(this);
	savegamemenu_descrtitle->set_label("subtitle");
	savegamemenu_descrtitle->set_background(false);
	savegamemenu_descrtitle->set_border(false);
	savegamemenu_descrtitle->set_font(ui::root()->font_large());
	savegamemenu_descrtitle->set_alignment(ui::AlignCenter);
	
	// savegame description label
	savegamemenu_descrlabel = new ui::Label(this);
	savegamemenu_descrlabel->set_label("info");
	savegamemenu_descrlabel->set_background(true);
	savegamemenu_descrlabel->set_border(true);
	
	// delete button is a child of description label
	savegamemenu_deletebutton = new ui::IconButton(savegamemenu_descrlabel, "bitmaps/icons/button_delete", "Delete");
	savegamemenu_deletebutton->set_label("delete");
	
	// save button
	savegamemenu_savebutton = new ui::Button(this, "Save");
	savegamemenu_savebutton->set_label("save");
	
	// cancel save/load/overwrite button
	savegamemenu_cancelbutton = new ui::Button(this, "Cancel");
	savegamemenu_cancelbutton->set_label("cancel");

	// confirm save/load/overwrite button
	savegamemenu_confirmsavebutton = new ui::Button(this, "Confirm");
	savegamemenu_confirmsavebutton->set_label("confirmsave");
	
	// confirm save/load/overwrite button
	savegamemenu_confirmdeletebutton = new ui::Button(this, "Delete");
	savegamemenu_confirmdeletebutton->set_label("confirmdelete");
	
	// description input box
	savegamemenu_descrinput = new ui::InputBox(this);
	savegamemenu_descrinput->set_label("description");
	savegamemenu_descrinput->hide();
}

SaveGameMenu::~SaveGameMenu()
{
}

void SaveGameMenu::resize()
{
	const float padding =  ui::UI::padding;
	const float icon_size = ui::UI::icon_small;
	
	// resize title label
	savegamemenu_titlelabel->set_size(width() - padding * 2.0f, savegamemenu_titlelabel->font()->height());	
	savegamemenu_titlelabel->set_location(padding, padding);

	// resize close button
	savegamemenu_closebutton->set_size(savegamemenu_titlelabel->font()->height(), savegamemenu_titlelabel->font()->height());
	savegamemenu_closebutton->set_location(savegamemenu_titlelabel->width() - savegamemenu_closebutton->width(), 0);
	
	// resize files listview
	savegamemenu_filelistview->set_size(
		ui::UI::elementsize.width(), 
		height() - 2.0f * padding - savegamemenu_titlelabel->bottom()
	);
	savegamemenu_filelistview->set_location(
		padding, 
		savegamemenu_titlelabel->bottom() + padding
	);
	
	// resize description title
	savegamemenu_descrtitle->set_size(
		width() - savegamemenu_filelistview->right() - 2.0f * padding,
		savegamemenu_descrtitle->font()->height()
	);	
	savegamemenu_descrtitle->set_location(
		savegamemenu_filelistview->right() + padding, 
		savegamemenu_filelistview->top() +  ui::UI::elementsize.width() + padding
	);
		
	// resize description label
	savegamemenu_descrlabel->set_size(
		savegamemenu_descrtitle->width(),
		savegamemenu_filelistview->bottom() - savegamemenu_descrtitle->bottom() - 2.0f * padding - ui::UI::elementsize.height()
	);
	savegamemenu_descrlabel->set_location(
		savegamemenu_filelistview->right() + padding, 
		savegamemenu_descrtitle->bottom() + padding
	);
	
	// resize delete button
	savegamemenu_deletebutton->set_size(icon_size, icon_size);
	savegamemenu_deletebutton->set_location(
		savegamemenu_descrtitle->width() - savegamemenu_deletebutton->width() - padding,
		padding
	);
	
	// resize screenshot
	const model::Material *screenshotmaterial = model::Material::find("ui/screenshot");
	if (screenshotmaterial) {
		float sx = savegamemenu_descrtitle->width() / screenshotmaterial->size().width();
		float sy = ui::UI::elementsize.width() / screenshotmaterial->size().height();
		float s = math::min (sx, sy);
		savegamemenu_screenshot->set_size(screenshotmaterial->size().width() * s, screenshotmaterial->size().height() * s);
	} else {
		savegamemenu_screenshot->set_size(
			ui::UI::elementsize.width(),
			ui::UI::elementsize.width()
		);
	}
	savegamemenu_screenshot->set_location(
		savegamemenu_descrtitle->left() + (savegamemenu_descrtitle->width() - savegamemenu_screenshot->width()) * 0.5f,
		savegamemenu_filelistview->top() + (ui::UI::elementsize.width() - savegamemenu_screenshot->height()) * 0.5f
	);

	
	// resize save button
	savegamemenu_savebutton->set_size(ui::UI::elementsize);
	savegamemenu_savebutton->set_location(
		savegamemenu_descrlabel->left() + (savegamemenu_descrlabel->width() - ui::UI::elementsize.width()) * 0.5f,
		savegamemenu_descrlabel->bottom() + padding);
	
	// resize save/load/overwrite confirm button
	savegamemenu_confirmsavebutton->set_size(ui::UI::elementsize);
	savegamemenu_confirmsavebutton->set_location(
		savegamemenu_descrlabel->left() + (savegamemenu_descrlabel->width() - 2.0f *  ui::UI::elementsize.width() - padding) * 0.5f,
		savegamemenu_descrlabel->bottom() + padding
	);
	
	// resize cancel button
	savegamemenu_cancelbutton->set_size(ui::UI::elementsize);
	savegamemenu_cancelbutton->set_location(
		savegamemenu_confirmsavebutton->right() + padding,
		savegamemenu_descrlabel->bottom() + padding
	);
	
	// resize confirm delete button
	savegamemenu_confirmdeletebutton->set_size(ui::UI::elementsize);
	savegamemenu_confirmdeletebutton->set_location(savegamemenu_confirmsavebutton->location());
}

void SaveGameMenu::refresh()
{	
	ui::ListItem *listitem = 0;
	
	std::string savegamepath(filesystem::writedir());
	savegamepath.append("savegames");
	
	filesystem::Directory directory(savegamepath);

	savegamemenu_filelistview->clear();
	savegamemenu_deletebutton->disable();
	savegamemenu_savebutton->hide();
	savegamemenu_savebutton->enable();
	
	savegamemenu_confirmsavebutton->hide();
	savegamemenu_confirmdeletebutton->hide();
	savegamemenu_cancelbutton->hide();
	
	if (savegamemenu_mode == Save) {
		listitem = new ui::ListItem(savegamemenu_filelistview, "NEW SAVEGAME");
		listitem->set_label("new");
		listitem->set_sortkey("[new]");
		listitem->set_font(ui::root()->font_tiny());
		listitem->set_height(listitem->font()->height() * 3.0f);
		
		savegamemenu_savebutton->set_text("Save");
		if (!core::localcontrol()) {
			savegamemenu_savebutton->disable();
		}
	} else {
		savegamemenu_savebutton->set_text("Load");
	}
	
	for (filesystem::Directory::FileNames::const_iterator it = directory.filenames().begin();
	    	it != directory.filenames().end(); ++it) 
	{
		const std::string filename((*it).c_str());
		if (filename.size() < 5) {
			continue;
		}
		
		std::string ext = filename.substr(filename.size() - 4);
		aux::lowercase(ext);
		if (ext.compare(".ini")) {
			continue;
		}
		
		std::string savename = filename.substr(0, filename.size() - 4);
		
		std::string descr;
		std::string timestamp;
		std::string info;
		
		get_savegame_info(savename, descr, info, timestamp);
			
		if (descr.size()) {
			std::ostringstream descrstr;
			descrstr << descr << '\n';
			descrstr << timestamp;
			
			listitem = new ui::ListItem(savegamemenu_filelistview, descrstr.str().c_str());
			listitem->set_value(savename);
			listitem->set_sortkey(timestamp);
			
			listitem->set_font(ui::root()->font_tiny());
			listitem->set_height(listitem->font()->height() * 3.0f);
		}
	}
	
	savegamemenu_filelistview->sort(false);
	savegamemenu_filelistview->event_resize();
	
	show_file_info();
}

void SaveGameMenu::hide()
{
	Window::hide();
	
	model::Material *screenshotmaterial = model::Material::find("ui/screenshot");
	if (screenshotmaterial) {
		for (model::Material::Layers::const_iterator lit = screenshotmaterial->layers().begin(); lit != screenshotmaterial->layers().end(); ++lit) {
			if ((*lit)->texture().size()) {
				render::Textures::unload((*lit)->texture());
				(*lit)->set_texture("");
				(*lit)->set_texture_id(0);
			}
		}
		
	}
	
	savegamemenu_screenshot->set_texture("");
}

void SaveGameMenu::show()
{
	Window::show();
	refresh();
}

void SaveGameMenu::show_file_info()
{
	savegamemenu_descrtitle->clear();
	savegamemenu_descrlabel->clear();
	savegamemenu_deletebutton->disable();
	
	savegamemenu_confirmsavebutton->hide();
	savegamemenu_confirmdeletebutton->hide();
	savegamemenu_cancelbutton->hide();
	savegamemenu_descrlabel->hide();
	savegamemenu_screenshot->hide();

	if (savegamemenu_filelistview->selected()) {
		savegamemenu_savebutton->show();
		savegamemenu_descrlabel->show();

		std::string savename(savegamemenu_filelistview->selected()->value().c_str());
		if (savename.size()) {
			std::string descr;
			std::string timestamp;
			std::string info;
		
			get_savegame_info(savename, descr, info, timestamp);
			
			std::ostringstream descrstr;
			//descrstr << descr << '\n';
			descrstr << info;		// info has a trailing newline
			descrstr << timestamp  << '\n';

			savegamemenu_deletebutton->enable();
			savegamemenu_descrtitle->set_text(savename);
			savegamemenu_descrlabel->set_text(descrstr.str().c_str());
						
			model::Material *screenshotmaterial = model::Material::find("ui/screenshot");
			if (!screenshotmaterial) {
				screenshotmaterial = model::Material::add("ui/screenshot");
			}

			model::Layer *screenshotlayer = 0;
			if (screenshotmaterial->layers().size() > 0) {
				screenshotlayer = (*screenshotmaterial->layers().begin());
			} else {
				screenshotlayer = screenshotmaterial->add_layer();
				screenshotlayer->set_fullbright(true);
			}
			if (screenshotlayer->texture().size()) {
				render::Textures::unload(screenshotlayer->texture());
				screenshotlayer->set_texture("");
			}
			
			const std::string screenshotfilename("savegames/" + savename);
			screenshotlayer->set_texture(screenshotfilename);
			render::Textures::image_loader(screenshotlayer);
			screenshotmaterial->set_size(screenshotlayer->size());
			
			savegamemenu_screenshot->set_texture(screenshotmaterial->name());
			savegamemenu_screenshot->show();
			
			resize();

		} else {
			// new savegame, immediatly show the save game dialog
			show_save_dialog();
			return;
		}		
	}
}

void SaveGameMenu::show_save_dialog()
{
	if (!savegamemenu_filelistview->selected()) {
		return;
	}
	std::string savename(savegamemenu_filelistview->selected()->value().c_str());		
	if (!savename.size()) {
		savegamemenu_descrtitle->set_text("New savegame");
		savegamemenu_confirmsavebutton->set_text("Save");
	} else {
		savegamemenu_descrtitle->set_text("Overwrite game " + savename + "?");
		savegamemenu_confirmsavebutton->set_text("Overwrite");
	}
	
	savegamemenu_savebutton->hide();
	savegamemenu_confirmsavebutton->show();
	savegamemenu_cancelbutton->show();
}

void SaveGameMenu::show_load_dialog()
{
	if (!savegamemenu_filelistview->selected()) {
		return;
	}
	std::string savename(savegamemenu_filelistview->selected()->value().c_str());		
	if (!savename.size()) {
		return;
	}

	savegamemenu_descrtitle->set_text("Load game " + savename + "?");
	savegamemenu_confirmsavebutton->set_text("Load");
	
	savegamemenu_savebutton->hide();
	savegamemenu_confirmsavebutton->show();
	savegamemenu_cancelbutton->show();
}

void SaveGameMenu::show_delete_dialog()
{
	if (!savegamemenu_filelistview->selected()) {
		return;
	}
	std::string savename(savegamemenu_filelistview->selected()->value().c_str());		
	if (!savename.size()) {
		return;
	}
	
	savegamemenu_descrtitle->set_text(savename);
	savegamemenu_descrtitle->set_text("Delete game " + savename + "?");

	savegamemenu_savebutton->hide();
	savegamemenu_confirmdeletebutton->show();
	savegamemenu_cancelbutton->show();	
}

bool SaveGameMenu::on_keypress(const int key, const unsigned int modifier)
{
	if (key == SDLK_ESCAPE) {
		if (visible()) {
			if (savegamemenu_cancelbutton->visible()) {
				show_file_info();
				return true;
			} else {
				// hide the parent mainwindow
				parent()->hide();
				return true;
			}
		}
	}

	return false;
}

bool SaveGameMenu::on_emit(ui::Widget *sender, const ui::Widget::Event event, void *data)
{
	if (sender == savegamemenu_closebutton) {
		if (event == ui::Widget::EventButtonClicked) {
			// hide the parent mainwindow
			parent()->hide();
			return true;
		}
	} else if (sender == savegamemenu_cancelbutton) {
		if (event == ui::Widget::EventButtonClicked) {
			show_file_info();
		}		
	} else if (sender == savegamemenu_confirmsavebutton) {
		if (event == ui::Widget::EventButtonClicked) {
			if (savegamemenu_mode == Save) {
				if (savegamemenu_filelistview->selected()) {
					std::string descr;
					savegame(savegamemenu_filelistview->selected()->value(), descr);
					parent()->hide();
				}
			} else {
				if (savegamemenu_filelistview->selected()) {
					loadgame(savegamemenu_filelistview->selected()->value());
					parent()->hide();
				}
			}
			return true;
		}
	} else if (sender == savegamemenu_savebutton) {
		if (event == ui::Widget::EventButtonClicked) {
			if (savegamemenu_mode == Save) {
				show_save_dialog();
			} else {
				show_load_dialog();
			}
			return true;
		}
	} else if (sender == savegamemenu_confirmdeletebutton) {
		if (event == ui::Widget::EventButtonClicked) {
			if (savegamemenu_filelistview->selected()) {
				deletegame(savegamemenu_filelistview->selected()->value());
				refresh();
			}
			return true;
		}
	} else if (sender == savegamemenu_deletebutton) {
		if (event == ui::Widget::EventButtonClicked) {
			if (savegamemenu_filelistview->selected()) {
				show_delete_dialog();
			}
			return true;
		}		
	} else if (sender == savegamemenu_filelistview) {
		if (event == ui::Widget::EventListViewChanged) {
			show_file_info();
			return true;
		}
	}
	
	return Window::on_emit(sender, event, data);
}

void SaveGameMenu::get_savegame_info(const std::string & savename, 
	std::string &game_descr,
	std::string &game_info, 
	std::string &game_timestamp)
{
	filesystem::IniFile inifile("savegames/" + savename);
	
	std::string infostr;
	
	game_descr.clear();
	game_info.clear();
	game_timestamp.clear();
	
	if (!inifile.is_open()) {
		return;
	}

	while(inifile.getline()) {
		if (inifile.got_key()) {

			if (inifile.in_section("savegame")) {

				if (inifile.got_key_string("description", game_descr)) {
					continue;
					
				} else if (inifile.got_key_string("timestamp", game_timestamp)) {
					continue;
					
				} else if (inifile.got_key_string("info", infostr)) {
					game_info.append(infostr);
					game_info += '\n';
					continue;
				}
			}
		}
	}
	inifile.close();
}

void SaveGameMenu::deletegame(std::string savename)
{
	std::string filename(filesystem::writedir() + "savegames/" + savename + ".ini");
	
	con_debug << "Deleteing " << filename << std::endl;
	::remove(filename.c_str());
}

void SaveGameMenu::savescreenshot(std::string savename)
{
	std::string filename(filesystem::writedir() + "savegames/" + savename + ".jpg");
	
	// redraw the world without ui
	/*
		hack: win32 seems to have triple buffering or reads pixels from the wrong buffer
		the workaround is to render the world twice
	*/
	
#ifdef __WIN32
	for (size_t i = 0; i < 2; ++i) {
#endif
	// Clear the color and depth buffers.
	gl::clear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
	
	// set camera transformation
	render::camera().frame(0.0f);
	
	render::camera().draw();

	// draw the world
	render::draw(0.0f);
	
	gl::disable(GL_TEXTURE_2D);
	gl::disable(GL_BLEND);

	video::swap_buffers();
#ifdef __WIN32
	}
#endif	
	render::Screenshot::savegameshot(filename);	
}

void SaveGameMenu::savegame(std::string savename, const std::string & description)
{
	if (!core::server() || !core::server()->module()) {
		return;
	}
	
	if (!core::localcontrol()) {
		return;
	}

	// find an approriate savegame name if none was specified
	if (!savename.size()) {
		std::string filename;
		unsigned long n = 0;
		do {
			n++;
			std::ostringstream numberstr;
			numberstr << std::setfill('0') << std::setw(4) << n;
			
			savename.assign("save");
			savename.append(numberstr.str());
			
			filename.assign(filesystem::writedir() + "savegames/" + savename + ".ini");
		} while (sys::file_exists(filename));
	}
	
	// create savegame diretory if required
	std::string savegamepath(filesystem::writedir());
	savegamepath.append("savegames");
	if (!sys::directory_exists(savegamepath)) {
		sys::mkdir(savegamepath);
	}
	
	filesystem::OFileStream ofs("savegames/" + savename + ".ini");
	
	core::application()->notify_message(core::Message::Info, "Saving " + savename);
	con_debug << "Saving " << ofs.filename() << std::endl;
	
	ofs << "; Project::OSiRiON" << std::endl;
	ofs << "; savegame data" << std::endl;
	ofs << std::endl;
	
	ofs << "[savegame]" << std::endl;
	ofs << "description=";
	if (description.size()) {
		ofs << description << std::endl;
	} else {
		if (core::localcontrol()->state() == core::Entity::Docked) {
			// FIXME implement entity->dock()
			ofs << core::localplayer()->view()->name() << std::endl;
		} else {
			ofs << core::localplayer()->zone()->name() << std::endl;
		}
	}
	ofs << "info=";
	if (core::localcontrol()->state() == core::Entity::Docked) {
		// FIXME implement entity->dock()
		ofs << core::localplayer()->view()->name() << ", ";
	}
	ofs << core::localplayer()->zone()->name() << std::endl;
	
	if (core::localcontrol()->info()) {
		ofs << "info=" << core::localcontrol()->info()->name() << std::endl;
	}
	ofs << "info=" << core::localplayer()->credits() << " credits" << std::endl;
	
	int year = 0; int month = 0; int day = 0; int hours = 0; int minutes = 0; int seconds = 0; int msec = 0;
	sys::get_localtime(year, month, day, hours, minutes, seconds, msec);
	
	std::ostringstream timestampstr;	
	timestampstr << std::setfill('0') << std::setw(4) << year << "-" << std::setw(2) << month << "-" << std::setw(2) << day << " ";
	timestampstr << std::setw(2) << hours << ":" << std::setw(2) << minutes << ":" << std::setw(2) << seconds;

	ofs << "timestamp=" << timestampstr.str() << std::endl;
	
	ofs << std::endl;
	
	core::server()->module()->game_save(core::localplayer(), ofs);
	
	ofs.close();
	
	// save screenshot
	savescreenshot(savename);
}

void SaveGameMenu::loadgame(std::string savename) {
	
	filesystem::IniFile inifile("savegames/" + savename);
	if (!inifile.is_open()) {
		con_warn << "Could not open savegames/" + savename << ".ini" << std::endl;
		return;
	}
	
	
	if (core::application()->connected())
		core::application()->disconnect();
	
	core::application()->connect("");
	
	con_debug << "Loading " << inifile.filename() << std::endl;
	core::application()->notify_message(core::Message::Info, "Loading " + savename);

	if (core::application()->connected() && core::server() && core::server()->module()) {
		core::server()->module()->game_load(core::localplayer(), inifile);
	}
	
	inifile.close();
}

} // namespace client