<?php
/**
 * @brief		Init for UTF8 Conversion
 * @author		<a href='http://www.invisionpower.com'>Invision Power Services, Inc.</a>
 * @copyright	(c) 2001 - SVN_YYYY Invision Power Services, Inc.
 * @license		http://www.invisionpower.com/legal/standards/
 * @package		IPS Tools
 * @since		4 Sept 2013
 * @version		SVN_VERSION_NUMBER
 */

namespace IPSUtf8;

/**
 * Class to contain IPS Social Suite autoloader and exception handler
 */
class IPSUtf8
{
	/**
	 * Initiate IPS Social Suite UTF8 Converter, autoloader and exception handler
	 *
	 * @return	void
	 */
	public static function init()
	{
		/* Set timezone */
		date_default_timezone_set( 'UTC' );
		
		/* Set default MB internal encoding */
		mb_internal_encoding('UTF-8');
		
		/* Constants */
		define( 'THIS_PATH', __DIR__ );
		
		$bits	= explode( DIRECTORY_SEPARATOR, THIS_PATH );
		$bit	= array_pop( $bits );
		$bit2	= array_pop( $bits );

		define( 'ROOT_PATH', preg_replace( '#' . preg_quote( DIRECTORY_SEPARATOR, '#' ) . $bit2 . preg_quote( DIRECTORY_SEPARATOR, '#' ) . $bit . '$#', '', THIS_PATH ) );

		define( 'IS_CLI', ( PHP_SAPI == 'cli' || empty( $_SERVER['REMOTE_ADDR'] ) ) ? true : false );
		
		/* Set Options - deliberately do not use root constants */
		if ( file_exists( './constants.php' ) )
		{
			@include_once( './constants.php' );
		}
		
		foreach( static::defaultConstants() AS $k => $v )
		{
			if ( !defined( $k ) )
			{
				define( $k, $v );
			}
		}

		@set_time_limit(0);
		
		/* Set autoloader */
		spl_autoload_register( '\IPSUtf8\IPSUtf8::autoloader', true, true );
		
		set_error_handler( '\IPSUtf8\IPSUtf8::errorHandler' );
		set_exception_handler( '\IPSUtf8\IPSUtf8::exceptionHandler' );
	}
	
	/**
	 * Default Constants
	 *
	 * @return	array
	 */
	public static function defaultConstants()
	{
		return array(
			'IPB_LOCK'				=> TRUE, /* Lock conversion to only IP.Board Databases */
			'FORCE_CONVERT'			=> FALSE, /* Enforce conversion */
			'FORCE_CONVERT_CHARSET'	=> NULL,
			'FORCE_CONVERT_METHOD'	=> NULL,
			'SOURCE_DB_CHARSET'		=> NULL, /* If set, will force the source database connection to use this charset */
			'UTF8_INSERT_ONLY'		=> FALSE, /* If true, and sql_charset is present and set to utf8 in conf_global.php, then the "fast" method will simply insert without converting. Useful for mixed collation databases where the utf8 tables are real utf8 */
		);
	}
	
	/**
	 * Error Handler
	 *
	 * @param	int		$errno		Error number
	 * @param	errstr	$errstr		Error message
	 * @param	string	$errfile	File
	 * @param	int		$errline	Line
	 * @param	array	$trace		Backtract
	 * @return	void
	 */
	public static function errorHandler( $errno, $errstr, $errfile, $errline, $trace=NULL )
	{
		if ( in_array( $errno, array( E_NOTICE ) ) )
		{
			return;
		}
		
		throw new \ErrorException( $errstr, $errno, 0, $errfile, $errline );
	}
	
	/**
	 * Exception Handler
	 *
	 * @param	\Exception	$exception	Exception class
	 * @return	void
	 */
	public static function exceptionHandler( $exception )
	{
		/* Send a diagnostics report if we can */
		$trace = $exception->getTrace();
		if ( isset( $trace[0]['class'] ) )
		{
			self::diagnostics( $exception, $trace[0]['class'] );
		}
				
		/* And display an error screen */
		try
		{
			if ( IS_CLI )
			{
				print "\nError: " . $exception->getMessage() . "\nFile: " . str_replace( THIS_PATH, '', $exception->getFile() ) . "\nLine: " . $exception->getLine() . "\n";
			}
			else
			{
				/* @todo Elaborate on this for browser */
				print "\nError: " . $exception->getMessage() . "\nFile: " . str_replace( THIS_PATH, '', $exception->getFile() ) . "\nLine: " . $exception->getLine() . "\n"; 
			}
		}
		catch ( \Exception $e )
		{
			if( isset( $_SERVER['SERVER_PROTOCOL'] ) and \strstr( $_SERVER['SERVER_PROTOCOL'], '/1.0' ) !== false )
			{
				header( "HTTP/1.0 500 Internal Server Error" );
			}
			else
			{
				header( "HTTP/1.1 500 Internal Server Error" );
			}
		
			if ( IS_CLI )
			{
				print "\nError: " . $e->getMessage() . "\nString: " . $e->getString() . "\nFile: " . str_replace( THIS_PATH, '', $e->getFile() ) . "\nLine: " . $e->getLine() . "\n";
			}
			else
			{
				/* @todo Elaborate on this for browser */
				print "\nError: " . $e->getMessage() . "\nString: " . $e->getString() . "\nFile: " . str_replace( THIS_PATH, '', $e->getFile() ) . "\nLine: " . $e->getLine() . "\n"; 
			}
		}
		exit;
	}
	
	/**
	 * Diagnostics Reporting
	 *
	 * @param	\Exception	$exception	Exception
	 * @param	string		$class 		Class that caused the exception
	 * @return	void
	 */
	public static function diagnostics( $exception, $class )
	{
		try
		{
			@file_put_contents( THIS_PATH . '/tmp/error_' . date('Y-m-d') . '.cgi', "\n" . str_repeat( '-', 48 ) . "\n" . date('r') . "\n" . var_export( $exception, true ), FILE_APPEND );
		}
		catch ( \Exception $e ) {}
	}
	
	/**
	 * Autoloader
	 *
	 * @param	string	$classname	Class to load
	 * @return	void
	 */
	public static function autoloader( $classname )
	{			
		/* Separate by namespace */
		$bits = explode( '\\', $classname );
		$vendorName = array_shift( $bits );
								
		/* Work out what namespace we're in */
		$class = array_pop( $bits );
		$namespace = empty( $bits ) ? 'IPSUtf8' : ( 'IPSUtf8\\' . implode( '\\', $bits ) );
		
		if( !class_exists( "{$namespace}\\{$class}", FALSE ) )
		{
			/* Locate file */
			$path = THIS_PATH . '/';
			$sourcesDirSet = FALSE;
			
			foreach ( array_merge( $bits, array( $class ) ) as $i => $bit )
			{
				if( preg_match( "/^[a-z0-9]/", $bit ) )
				{
					if( $i === 0 )
					{
						$sourcesDirSet = TRUE;
					}
				}
				else if( $sourcesDirSet === FALSE )
				{
					$path .= 'system/';
					
					$sourcesDirSet = TRUE;
				}
			
				$path .= "{$bit}/";
			}
							
			/* Load it */
			$path = \substr( $path, 0, -1 ) . '.php';
			
			if( !file_exists( $path ) )
			{
				$path = \substr( $path, 0, -4 ) . \substr( $path, \strrpos( $path, '/' ) );
				
				if ( !file_exists( $path ) )
				{
					return FALSE;
				}
			}
			
			require_once( $path );
			
			/* Is it an interface? */
			if ( interface_exists( "{$namespace}\\{$class}", FALSE ) )
			{
				return;
			}
				
			/* Doesn't exist? */
			if( !class_exists( "{$namespace}\\{$class}", FALSE ) )
			{
				trigger_error( "Class {$classname} could not be loaded. Ensure it is in the correct namespace.", E_USER_ERROR );
			}
		}
	}

}

/* Init */
IPSUtf8::init();