// Copyright (c) 2007, Rodrigo Braz Monteiro
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//   * Neither the name of the Aegisub Group nor the names of its contributors
//     may be used to endorse or promote products derived from this software
//     without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
// Aegisub Project http://www.aegisub.org/

/// @file help_button.cpp
/// @brief Push-button opening the help file at a specified section
/// @ingroup custom_control
///

#include "config.h"

#include "help_button.h"

#ifndef AGI_PRE
#include <algorithm>
#include <functional>
#include <map>

#include <wx/filename.h>
#include <wx/msgdlg.h>
#endif

#include <libaegisub/exception.h>

#include "standard_paths.h"
#include "utils.h"

static std::map<wxString,wxString> *pages = 0;

static void init_static() {
	if (!pages) {
		pages = new std::map<wxString, wxString>;
		std::map<wxString, wxString> &page = *pages;
		page["Attachment Manager"] = "Attachment_Manager";
		page["Automation Manager"] = "Automation/Manager";
		page["Colour Picker"] = "Colour_Picker";
		page["Dummy Video"] = "Video#dummyvideo";
		page["Export"] = "Exporting";
		page["Fonts Collector"] = "Fonts_Collector";
		page["Kanji Timer"] = "Kanji_Timer";
		page["Main"] = "Main_Page";
		page["Options"] = "Options";
		page["Paste Over"] = "Paste_Over";
		page["Properties"] = "Properties";
		page["Resample resolution"] = "Resolution_Resampler";
		page["Shift Times"] = "Shift_Times";
		page["Select Lines"] = "Select_Lines";
		page["Spell Checker"] = "Spell_Checker";
		page["Style Editor"] = "Styles";
		page["Styles Manager"] = "Styles";
		page["Styling Assistant"] = "Styling_Assistant";
		page["Timing Processor"] = "Timing_Post-Processor";
		page["Translation Assistant"] = "Translation_Assistant";
		page["Visual Typesetting"] = "Visual_Typesetting";
	}
}

HelpButton::HelpButton(wxWindow *parent, wxString const& page, wxPoint position, wxSize size)
: wxButton(parent, wxID_HELP, "", position, size)
{
	Bind(wxEVT_COMMAND_BUTTON_CLICKED, std::bind(&HelpButton::OpenPage, page));
	init_static();
	if (pages->find(page) == pages->end())
		throw agi::InternalError("Invalid help page", 0);
}

void HelpButton::OpenPage(wxString const& pageID) {
	init_static();

	wxString page = (*pages)[pageID];
	wxString section;
	page = page.BeforeFirst('#', &section);

	wxFileName docFile(StandardPaths::DecodePath("?data/docs/"), page, "html", wxPATH_NATIVE);

	wxString url;
	// If we can read a file by the constructed name, assume we have a local copy of the manual
	if (docFile.IsFileReadable())
		// Tested IE8, Firefox 3.5, Safari 4, Chrome 4 and Opera 10 on Windows, they all handle
		// various variations of slashes, missing one at the start and using backslashes throughout
		// is safe with everything everyone uses. Blame Microsoft.
		url = wxString("file://") + docFile.GetFullPath(wxPATH_NATIVE);
	else
		url = wxString::Format("http://docs.aegisub.org/3.0/%s/#%s", page, section);

	wxLaunchDefaultBrowser(url);
}

void HelpButton::ClearPages() {
	delete pages;
}