/*  Db.cpp
 *
 *  Copyright (C) 2013-2016  Jim Evins <evins@snaught.com>
 *
 *  This file is part of gLabels-qt.
 *
 *  gLabels-qt 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  gLabels-qt 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 gLabels-qt.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "Db.h"

#include "Config.h"
#include "StrUtil.h"
#include "FileUtil.h"
#include "Settings.h"
#include "XmlCategoryParser.h"
#include "XmlPaperParser.h"
#include "XmlTemplateParser.h"
#include "XmlTemplateCreator.h"
#include "XmlVendorParser.h"

#include <QtDebug>
#include <QtGlobal>

#include <algorithm>


namespace glabels
{
	namespace model
	{
	
		//
		// Private
		//
		namespace
		{
			const QString    empty = "";
	
			bool partNameLessThan( const Template *a, const Template *b )
			{
				return StrUtil::comparePartNames( a->name(), b->name() ) < 0;
			}
		}


		//
		// Static data
		//
		QList<Paper*>    Db::mPapers;
		QStringList      Db::mPaperIds;
		QStringList      Db::mPaperNames;
		QList<Category*> Db::mCategories;
		QStringList      Db::mCategoryIds;
		QStringList      Db::mCategoryNames;
		QList<Vendor*>   Db::mVendors;
		QStringList      Db::mVendorNames;
		QList<Template*> Db::mTemplates;

	
		Db::Db()
		{
			readPapers();
			readCategories();
			readVendors();
			readTemplates();
		}


		void Db::init()
		{
			instance();
		}

	
		Db* Db::instance()
		{
			static auto* db = new Db();
			return db;
		}


		const QList<Paper*>& Db::papers()
		{
			return mPapers;
		}


		const QStringList& Db::paperIds()
		{
			return mPaperIds;
		}


		const QStringList& Db::paperNames()
		{
			return mPaperNames;
		}


		const QList<Category*>& Db::categories()
		{
			return mCategories;
		}


		const QStringList& Db::categoryIds()
		{
			return mCategoryIds;
		}


		const QStringList& Db::categoryNames()
		{
			return mCategoryNames;
		}


		const QList<Vendor*>& Db::vendors()
		{
			return mVendors;
		}


		const QStringList& Db::vendorNames()
		{
			return mVendorNames;
		}


		const QList<Template*>& Db::templates()
		{
			return mTemplates;
		}


		void Db::registerPaper( Paper *paper )
		{
			if ( !isPaperIdKnown( paper->id() ) )
			{
				mPapers << paper;
				mPaperIds << paper->id();
				mPaperNames << paper->name();
			}
			else
			{
				qWarning() << "Duplicate paper ID: " << paper->id();
			}
		}


		const Paper *Db::lookupPaperFromName( const QString& name )
		{
			if ( name.isNull() || name.isEmpty() )
			{
				qWarning() << "NULL paper name.";
				return mPapers.first();
			}

			foreach ( Paper *paper, mPapers )
			{
				if ( paper->name() == name )
				{
					return paper;
				}
			}

			qWarning() << "Unknown paper name: " << name;
			return nullptr;
		}


		const Paper *Db::lookupPaperFromId( const QString& id )
		{
			if ( id.isNull() || id.isEmpty() )
			{
				qWarning() << "NULL paper ID.";
				return mPapers.first();
			}

			foreach ( Paper *paper, mPapers )
			{
				if ( paper->id() == id )
				{
					return paper;
				}
			}

			qWarning() << "Unknown paper ID: " << id;
			return nullptr;
		}


		QString Db::lookupPaperIdFromName( const QString& name )
		{
			if ( !name.isNull() && !name.isEmpty() )
			{
				if ( name == tr("Other") )
				{
					return "other";
				}
				else if ( name == tr("Roll") )
				{
					return "roll";
				}

				const Paper *paper = lookupPaperFromName( name );
				if ( paper != nullptr )
				{
					return paper->id();
				}
			}

			qWarning() << "Unknown paper name: " << name;
			return empty;
		}


		QString Db::lookupPaperNameFromId( const QString& id )
		{
			if ( !id.isNull() && !id.isEmpty() )
			{
				if ( id == "roll" )
				{
					return tr("Roll");
				}
				else
				{
					return tr("Other");
				}

				const Paper *paper = lookupPaperFromId( id );
				if ( paper != nullptr )
				{
					return paper->name();
				}
			}

			qWarning() << "Unknown paper id: " << id;
			return empty;
		}


		bool Db::isPaperIdKnown( const QString& id )
		{
			foreach ( Paper *paper, mPapers )
			{
				if ( paper->id() == id )
				{
					return true;
				}
			}

			return false;
		}


		void Db::registerCategory( Category *category )
		{
			if ( !isCategoryIdKnown( category->id() ) )
			{
				mCategories << category;
				mCategoryIds << category->id();
				mCategoryNames << category->name();
			}
			else
			{
				qWarning() << "Duplicate category ID: " << category->id();
			}
		}


		const Category *Db::lookupCategoryFromName( const QString& name )
		{
			if ( name.isNull() || name.isEmpty() )
			{
				qWarning() << "NULL category name.";
				return mCategories.first();
			}

			foreach ( Category *category, mCategories )
			{
				if ( category->name() == name )
				{
					return category;
				}
			}

			qWarning() << "Unknown category name: \"%s\"." << name;
			return nullptr;
		}


		const Category *Db::lookupCategoryFromId( const QString& id )
		{
			if ( id.isNull() || id.isEmpty() )
			{
				qDebug() << "NULL category ID.";
				return mCategories.first();
			}

			foreach ( Category *category, mCategories )
			{
				if ( category->id() == id )
				{
					return category;
				}
			}

			qWarning() << "Unknown category ID: " << id;
			return nullptr;
		}


		QString Db::lookupCategoryIdFromName( const QString& name )
		{
			if ( !name.isNull() && !name.isEmpty() )
			{
				const Category *category = lookupCategoryFromName( name );
				if ( category != nullptr )
				{
					return category->id();
				}
			}

			qWarning() << "Unknown category name: " << name;
			return empty;
		}


		QString Db::lookupCategoryNameFromId( const QString& id )
		{
			if ( !id.isNull() && !id.isEmpty() )
			{
				const Category *category = lookupCategoryFromId( id );
				if ( category != nullptr )
				{
					return category->name();
				}
			}

			qWarning() << "Unknown category id: " << id;
			return empty;
		}


		bool Db::isCategoryIdKnown( const QString& id )
		{
			foreach ( Category *category, mCategories )
			{
				if ( category->id() == id )
				{
					return true;
				}
			}

			return false;
		}


		void Db::registerVendor( Vendor *vendor )
		{
			if ( !isVendorNameKnown( vendor->name() ) )
			{
				mVendors << vendor;
				mVendorNames << vendor->name();
			}
			else
			{
				qWarning() << "Duplicate vendor name: " << vendor->name();
			}
		}


		const Vendor *Db::lookupVendorFromName( const QString& name )
		{
			if ( name.isNull() || name.isEmpty() )
			{
				qWarning() << "NULL vendor name.";
				return mVendors.first();
			}

			foreach ( Vendor *vendor, mVendors )
			{
				if ( vendor->name() == name )
				{
					return vendor;
				}
			}

			qWarning() << "Unknown vendor name: " << name;
			return nullptr;
		}


		QString Db::lookupVendorUrlFromName( const QString& name )
		{
			if ( !name.isNull() && !name.isEmpty() )
			{
				const Vendor *vendor = lookupVendorFromName( name );
				if ( vendor != nullptr )
				{
					return vendor->url();
				}
			}

			qWarning() << "Unknown vendor name: " << name;
			return empty;
		}


		bool Db::isVendorNameKnown( const QString& name )
		{
			foreach ( Vendor *vendor, mVendors )
			{
				if ( vendor->name() == name )
				{
					return true;
				}
			}

			return false;
		}


		void Db::registerTemplate( Template *tmplate )
		{
			if ( !isTemplateKnown( tmplate->brand(), tmplate->part() ) )
			{
				mTemplates << tmplate;
			}
			else
			{
				qWarning() << "Duplicate template name: " << tmplate->name();
			}
		}


		const Template *Db::lookupTemplateFromName( const QString& name )
		{
			if ( name.isNull() || name.isEmpty() )
			{
				qWarning() << "NULL template name.";
				return mTemplates.first();
			}

			foreach ( Template *tmplate, mTemplates )
			{
				if ( tmplate->name() == name )
				{
					return tmplate;
				}
			}

			qWarning() << "Unknown template name: " << name;
			return nullptr;
		}


		const Template *Db::lookupTemplateFromBrandPart( const QString& brand, const QString& part )
		{
			if ( brand.isNull() || brand.isEmpty() || part.isNull() || part.isEmpty() )
			{
				qWarning() << "NULL template brand and/or part.";
				return mTemplates.first();
			}

			foreach ( Template *tmplate, mTemplates )
			{
				if ( (tmplate->brand() == brand) && (tmplate->part() == part) )
				{
					return tmplate;
				}
			}

			qWarning() << "Unknown template brand, part: " << brand << ", " << part;
			return nullptr;
		}


		bool Db::isTemplateKnown( const QString& brand, const QString& part )
		{
			foreach ( Template *tmplate, mTemplates )
			{
				if ( (tmplate->brand() == brand) && (tmplate->part() == part) )
				{
					return true;
				}
			}

			return false;
		}


		bool Db::isSystemTemplateKnown( const QString& brand, const QString& part )
		{
			foreach ( Template *tmplate, mTemplates )
			{
				if ( (tmplate->brand() == brand) &&
				     (tmplate->part() == part)   &&
				     !tmplate->isUserDefined() )
				{
					return true;
				}
			}

			return false;
		}


		QStringList Db::getNameListOfSimilarTemplates( const QString& name )
		{
			QStringList list;

			const Template *tmplate1 = lookupTemplateFromName( name );
			if ( tmplate1 == nullptr )
			{
				qWarning() << "Unknown template name: " << name;
				return list;
			}

			foreach (const Template *tmplate2, mTemplates )
			{
				if ( tmplate1->name() != tmplate2->name() )
				{
					if ( tmplate1->isSimilarTo( tmplate2 ) )
					{
						list << tmplate2->name();
					}
				}
			}

			return list;
		}


		QString Db::userTemplateFilename( const QString& brand, const QString& part )
		{
			QString filename = brand + "_" + part + ".template";
			return FileUtil::userTemplatesDir().filePath( filename );
		}


		void Db::registerUserTemplate( Template *tmplate )
		{
			QString filename = userTemplateFilename( tmplate->brand(), tmplate->part() );

			// Write file
			if ( XmlTemplateCreator().writeTemplate( tmplate, filename ) )
			{
				// Add template to list of registered templates
				registerTemplate( tmplate );
				Settings::addToRecentTemplateList( tmplate->name() );
			}
			else
			{
				qWarning() << "Problem writing user template" << filename;
			}
		}


		void Db::deleteUserTemplateByBrandPart( const QString& brand, const QString& part )
		{
			Template* tmplate;
			foreach ( Template *candidate, mTemplates )
			{
				if ( candidate->isUserDefined() &&
				     (candidate->brand() == brand) && (candidate->part() == part) )
				{
					tmplate = candidate;
					break;
				}
			}

			if ( tmplate )
			{
				mTemplates.removeOne( tmplate );
				delete tmplate;

				QString filename = userTemplateFilename( brand, part );
				QFile( filename ).remove();
			}
		}


		void Db::printKnownPapers()
		{
			qDebug() << "KNOWN PAPERS:";

			foreach ( Paper *paper, mPapers )
			{
				qDebug() << "paper "
				         << "id="       << paper->id()          << ", "
				         << "name="     << paper->name()        << ", "
				         << "width="    << paper->width().pt()  << "pts, "
				         << "height="   << paper->height().pt() << "pts, "
				         << "pwg_size=" << paper->pwgSize();
			}

			qDebug();
		}


		void Db::printKnownCategories()
		{
			qDebug() << "KNOWN CATEGORIES:";

			foreach ( Category *category, mCategories )
			{
				qDebug() << "category "
				         << "id="    << category->id()   << ", "
				         << "name="  << category->name();
			}

			qDebug();
		}


		void Db::printKnownVendors()
		{
			qDebug() << "KNOWN VENDORS:";

			foreach ( Vendor *vendor, mVendors )
			{
				qDebug() << "vendor "
				         << "name='" << vendor->name() << ", "
				         << "url='"  << vendor->url();
			}

			qDebug();
		}


		void Db::printKnownTemplates()
		{
			qDebug() << "KNOWN TEMPLATES:";

			foreach ( Template *tmplate, mTemplates )
			{
				qDebug() << "template "
				         << "brand="       << tmplate->brand()       << ", "
				         << "part="        << tmplate->part()        << ", "
				         << "description=" << tmplate->description();
			}

			qDebug();
		}


		void Db::readPapers()
		{
			readPapersFromDir( FileUtil::systemTemplatesDir() );
		}


		void Db::readPapersFromDir( const QDir& dir )
		{
			XmlPaperParser parser;

			foreach ( QString fileName, dir.entryList( QDir::Files ) )
			{
				if ( fileName == "paper-sizes.xml" )
				{
					parser.readFile( dir.absoluteFilePath( fileName ) );
				}
			}
		}


		void Db::readCategories()
		{
			readCategoriesFromDir( FileUtil::systemTemplatesDir() );
		}


		void Db::readCategoriesFromDir( const QDir& dir )
		{
			XmlCategoryParser parser;

			foreach ( QString fileName, dir.entryList( QDir::Files ) )
			{
				if ( fileName == "categories.xml" )
				{
					parser.readFile( dir.absoluteFilePath( fileName ) );
				}
			}
		}


		void Db::readVendors()
		{
			readVendorsFromDir( FileUtil::systemTemplatesDir() );
		}


		void Db::readVendorsFromDir( const QDir& dir )
		{
			XmlVendorParser parser;

			foreach ( QString fileName, dir.entryList( QDir::Files ) )
			{
				if ( fileName == "vendors.xml" )
				{
					parser.readFile( dir.absoluteFilePath( fileName ) );
				}
			}
		}


		void Db::readTemplates()
		{
			readTemplatesFromDir( FileUtil::systemTemplatesDir(), false );
			readTemplatesFromDir( FileUtil::manualUserTemplatesDir(), false );
			readTemplatesFromDir( FileUtil::userTemplatesDir(), true );

			std::stable_sort( mTemplates.begin(), mTemplates.end(), partNameLessThan );
		}


		void Db::readTemplatesFromDir( const QDir& dir, bool isUserDefined )
		{
			QStringList filters;
			filters << "*-templates.xml" << "*.template";

			XmlTemplateParser parser;

			foreach ( QString fileName, dir.entryList( filters, QDir::Files ) )
			{
				parser.readFile( dir.absoluteFilePath( fileName ), isUserDefined );
			}
		}

	}
}