/****************************************************************************
 * Visual Boy Advance GX
 *
 * Tantric September 2008
 *
 * preferences.cpp
 *
 * Preferences save/load to XML file
 ***************************************************************************/

#include <gccore.h>
#include <stdio.h>
#include <string.h>
#include <ogcsys.h>
#include <mxml.h>

#include "vba.h"
#include "images/saveicon.h"
#include "menudraw.h"
#include "memcardop.h"
#include "fileop.h"
#include "filesel.h"
#include "input.h"

/****************************************************************************
 * Prepare Preferences Data
 *
 * This sets up the save buffer for saving.
 ***************************************************************************/
static mxml_node_t *xml = NULL;
static mxml_node_t *data = NULL;
static mxml_node_t *section = NULL;
static mxml_node_t *item = NULL;
static mxml_node_t *elem = NULL;

static char temp[20];

static const char * toStr(int i)
{
	sprintf(temp, "%d", i);
	return temp;
}
static const char * FtoStr(float i)
{
	sprintf(temp, "%.2f", i);
	return temp;
}

static void createXMLSection(const char * name, const char * description)
{
	section = mxmlNewElement(data, "section");
	mxmlElementSetAttr(section, "name", name);
	mxmlElementSetAttr(section, "description", description);
}

static void createXMLSetting(const char * name, const char * description, const char * value)
{
	item = mxmlNewElement(section, "setting");
	mxmlElementSetAttr(item, "name", name);
	mxmlElementSetAttr(item, "value", value);
	mxmlElementSetAttr(item, "description", description);
}

static void createXMLController(unsigned int controller[], const char * name, const char * description)
{
	item = mxmlNewElement(section, "controller");
	mxmlElementSetAttr(item, "name", name);
	mxmlElementSetAttr(item, "description", description);

	// create buttons
	for(int i=0; i < MAXJP; i++)
	{
		elem = mxmlNewElement(item, "button");
		mxmlElementSetAttr(elem, "number", toStr(i));
		mxmlElementSetAttr(elem, "assignment", toStr(controller[i]));
	}
}

static const char * XMLSaveCallback(mxml_node_t *node, int where)
{
	const char *name;

	name = node->value.element.name;

	if(where == MXML_WS_BEFORE_CLOSE)
	{
		if(!strcmp(name, "file") || !strcmp(name, "section"))
			return ("\n");
		else if(!strcmp(name, "controller"))
			return ("\n\t");
	}
	if (where == MXML_WS_BEFORE_OPEN)
	{
		if(!strcmp(name, "file"))
			return ("\n");
		else if(!strcmp(name, "section"))
			return ("\n\n");
		else if(!strcmp(name, "setting") || !strcmp(name, "controller"))
			return ("\n\t");
		else if(!strcmp(name, "button"))
			return ("\n\t\t");
	}
	return (NULL);
}


static int
preparePrefsData (int method)
{
	int offset = 0;

	// add save icon and comments for Memory Card saves
	if(method == METHOD_MC_SLOTA || method == METHOD_MC_SLOTB)
	{
		offset = sizeof (saveicon);

		// Copy in save icon
		memcpy (savebuffer, saveicon, offset);

		// And the comments
		char prefscomment[2][32];
		memset(prefscomment, 0, 64);
		sprintf (prefscomment[0], "%s Prefs", APPNAME);
		sprintf (prefscomment[1], "Preferences");
		memcpy (savebuffer + offset, prefscomment, 64);
		offset += 64;
	}

	xml = mxmlNewXML("1.0");
	mxmlSetWrapMargin(0); // disable line wrapping

	data = mxmlNewElement(xml, "file");
	mxmlElementSetAttr(data, "app",APPNAME);
	mxmlElementSetAttr(data, "version",APPVERSION);

	createXMLSection("File", "File Settings");

	createXMLSetting("AutoLoad", "Auto Load", toStr(GCSettings.AutoLoad));
	createXMLSetting("AutoSave", "Auto Save", toStr(GCSettings.AutoSave));
	createXMLSetting("LoadMethod", "Load Method", toStr(GCSettings.LoadMethod));
	createXMLSetting("SaveMethod", "Save Method", toStr(GCSettings.SaveMethod));
	createXMLSetting("LoadFolder", "Load Folder", GCSettings.LoadFolder);
	createXMLSetting("SaveFolder", "Save Folder", GCSettings.SaveFolder);
	//createXMLSetting("CheatFolder", "Cheats Folder", GCSettings.CheatFolder);
	createXMLSetting("VerifySaves", "Verify Memory Card Saves", toStr(GCSettings.VerifySaves));

	createXMLSection("Network", "Network Settings");

	createXMLSetting("smbip", "Share Computer IP", GCSettings.smbip);
	createXMLSetting("smbshare", "Share Name", GCSettings.smbshare);
	createXMLSetting("smbuser", "Share Username", GCSettings.smbuser);
	createXMLSetting("smbpwd", "Share Password", GCSettings.smbpwd);

	createXMLSection("Emulation", "Emulation Settings");

	createXMLSetting("Zoom", "Zoom On/Off", toStr(GCSettings.Zoom));
	createXMLSetting("ZoomLevel", "Zoom Level", FtoStr(GCSettings.ZoomLevel));
	createXMLSetting("render", "Video Filtering", toStr(GCSettings.render));
	createXMLSetting("widescreen", "Aspect Ratio Correction", toStr(GCSettings.widescreen));

	createXMLSection("Controller", "Controller Settings");

	createXMLController(gcpadmap, "gcpadmap", "GameCube Pad");
	createXMLController(wmpadmap, "wmpadmap", "Wiimote");
	createXMLController(ccpadmap, "ccpadmap", "Classic Controller");
	createXMLController(ncpadmap, "ncpadmap", "Nunchuk");

	int datasize = mxmlSaveString(xml, (char *)savebuffer, SAVEBUFFERSIZE, XMLSaveCallback);

	mxmlDelete(xml);

	return datasize;
}


/****************************************************************************
 * loadXMLSetting
 *
 * Load XML elements into variables for an individual variable
 ***************************************************************************/

static void loadXMLSetting(char * var, const char * name, int maxsize)
{
	item = mxmlFindElement(xml, xml, "setting", "name", name, MXML_DESCEND);
	if(item)
	{
		const char * tmp = mxmlElementGetAttr(item, "value");
		if(tmp)
			snprintf(var, maxsize, "%s", tmp);
	}
}
static void loadXMLSetting(int * var, const char * name)
{
	item = mxmlFindElement(xml, xml, "setting", "name", name, MXML_DESCEND);
	if(item)
	{
		const char * tmp = mxmlElementGetAttr(item, "value");
		if(tmp)
			*var = atoi(tmp);
	}
}
static void loadXMLSetting(float * var, const char * name)
{
	item = mxmlFindElement(xml, xml, "setting", "name", name, MXML_DESCEND);
	if(item)
	{
		const char * tmp = mxmlElementGetAttr(item, "value");
		if(tmp)
			*var = atof(tmp);
	}
}

/****************************************************************************
 * loadXMLController
 *
 * Load XML elements into variables for a controller mapping
 ***************************************************************************/

static void loadXMLController(unsigned int controller[], const char * name)
{
	item = mxmlFindElement(xml, xml, "controller", "name", name, MXML_DESCEND);

	if(item)
	{
		// populate buttons
		for(int i=0; i < MAXJP; i++)
		{
			elem = mxmlFindElement(item, xml, "button", "number", toStr(i), MXML_DESCEND);
			if(elem)
			{
				const char * tmp = mxmlElementGetAttr(elem, "assignment");
				if(tmp)
					controller[i] = atoi(tmp);
			}
		}
	}
}

/****************************************************************************
 * decodePrefsData
 *
 * Decodes preferences - parses XML and loads preferences into the variables
 ***************************************************************************/

static bool
decodePrefsData (int method)
{
	bool result = false;
	int offset = 0;

	// skip save icon and comments for Memory Card saves
	if(method == METHOD_MC_SLOTA || method == METHOD_MC_SLOTB)
	{
		offset = sizeof (saveicon);
		offset += 64; // sizeof comments
	}

	xml = mxmlLoadString(NULL, (char *)savebuffer+offset, MXML_TEXT_CALLBACK);

	if(xml)
	{
		// check settings version
		item = mxmlFindElement(xml, xml, "file", "version", NULL, MXML_DESCEND);
		if(item) // a version entry exists
		{
			const char * version = mxmlElementGetAttr(item, "version");

			if(version)
			{
				// this code assumes version in format X.X.X
				// XX.X.X, X.XX.X, or X.X.XX will NOT work
				int verMajor = version[0] - '0';
				int verMinor = version[2] - '0';
				int verPoint = version[4] - '0';
				int curMajor = APPVERSION[0] - '0';
				int curMinor = APPVERSION[2] - '0';
				int curPoint = APPVERSION[4] - '0';

				// first we'll check that the versioning is valid
				if(!(verMajor >= 0 && verMajor <= 9 &&
					verMinor >= 0 && verMinor <= 9 &&
					verPoint >= 0 && verPoint <= 9))
					result = false;
				else if(verPoint < 4 && verMajor == 1) // less than version 1.0.4
					result = false; // reset settings
				else if(verMajor > curMajor || verMinor > curMinor || verPoint > curPoint) // some future version
					result = false; // reset settings
				else
					result = true;
			}
		}

		if(result)
		{
			// File Settings

			loadXMLSetting(&GCSettings.AutoLoad, "AutoLoad");
			loadXMLSetting(&GCSettings.AutoSave, "AutoSave");
			loadXMLSetting(&GCSettings.LoadMethod, "LoadMethod");
			loadXMLSetting(&GCSettings.SaveMethod, "SaveMethod");
			loadXMLSetting(GCSettings.LoadFolder, "LoadFolder", sizeof(GCSettings.LoadFolder));
			loadXMLSetting(GCSettings.SaveFolder, "SaveFolder", sizeof(GCSettings.SaveFolder));
			//loadXMLSetting(GCSettings.CheatFolder, "CheatFolder", sizeof(GCSettings.CheatFolder));
			loadXMLSetting(&GCSettings.VerifySaves, "VerifySaves");

			// Network Settings

			loadXMLSetting(GCSettings.smbip, "smbip", sizeof(GCSettings.smbip));
			loadXMLSetting(GCSettings.smbshare, "smbshare", sizeof(GCSettings.smbshare));
			loadXMLSetting(GCSettings.smbuser, "smbuser", sizeof(GCSettings.smbuser));
			loadXMLSetting(GCSettings.smbpwd, "smbpwd", sizeof(GCSettings.smbpwd));

			// Emulation Settings

			loadXMLSetting(&GCSettings.Zoom, "Zoom");
			loadXMLSetting(&GCSettings.ZoomLevel, "ZoomLevel");
			loadXMLSetting(&GCSettings.render, "render");
			loadXMLSetting(&GCSettings.widescreen, "widescreen");

			// Controller Settings

			loadXMLController(gcpadmap, "gcpadmap");
			loadXMLController(wmpadmap, "wmpadmap");
			loadXMLController(ccpadmap, "ccpadmap");
			loadXMLController(ncpadmap, "ncpadmap");
		}
		mxmlDelete(xml);
	}

	return result;
}

/****************************************************************************
 * Save Preferences
 ***************************************************************************/
bool
SavePrefs (bool silent)
{
	char filepath[1024];
	int datasize;
	int offset = 0;

	// We'll save using the first available method (probably SD) since this
	// is the method preferences will be loaded from by default
	int method = autoSaveMethod(silent);

	if(!MakeFilePath(filepath, FILE_PREF, method))
		return false;

	if (!silent)
		ShowAction ("Saving preferences...");

	AllocSaveBuffer ();
	datasize = preparePrefsData (method);

	offset = SaveFile(filepath, datasize, method, silent);

	FreeSaveBuffer ();

	if (offset > 0)
	{
		if (!silent)
			WaitPrompt ("Preferences saved");
		return true;
	}
	return false;
}

/****************************************************************************
 * Load Preferences from specified method
 ***************************************************************************/
bool
LoadPrefsFromMethod (int method)
{
	bool retval = false;
	char filepath[1024];
	int offset = 0;

	if(!MakeFilePath(filepath, FILE_PREF, method))
		return false;

	AllocSaveBuffer ();

	offset = LoadFile(filepath, method, SILENT);

	if (offset > 0)
		retval = decodePrefsData (method);

	FreeSaveBuffer ();

	return retval;
}

/****************************************************************************
 * Load Preferences
 * Checks sources consecutively until we find a preference file
 ***************************************************************************/
bool LoadPrefs()
{
	ShowAction ("Loading preferences...");
	bool prefFound = false;
	if(ChangeInterface(METHOD_SD, SILENT))
		prefFound = LoadPrefsFromMethod(METHOD_SD);
	if(!prefFound && ChangeInterface(METHOD_USB, SILENT))
		prefFound = LoadPrefsFromMethod(METHOD_USB);
	if(!prefFound && TestCard(CARD_SLOTA, SILENT))
		prefFound = LoadPrefsFromMethod(METHOD_MC_SLOTA);
	if(!prefFound && TestCard(CARD_SLOTB, SILENT))
		prefFound = LoadPrefsFromMethod(METHOD_MC_SLOTB);
	if(!prefFound && ChangeInterface(METHOD_SMB, SILENT))
		prefFound = LoadPrefsFromMethod(METHOD_SMB);

	return prefFound;
}