<?php  if (!defined('BASEPATH')) exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 4.3.2 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2006, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.3.1
 * @filesource
 */

// ------------------------------------------------------------------------

/**
 * HTML Table Generating Class
 *
 * Lets you create tables manually or from database result objects, or arrays.
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	HTML Tables
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/libraries/uri.html
 */
class CI_Table {

	var $rows				= array();
	var $heading			= array();
	var $auto_heading		= TRUE;	
	var $caption			= NULL;	
	var $template 			= NULL;
	var $newline			= "\n";
	var $empty_cells		= "";
	
	
	function CI_Table()
	{
		log_message('debug', "Table Class Initialized");
	}

	// --------------------------------------------------------------------

	/**
	 * Set the template
	 *
	 * @access	public
	 * @param	array
	 * @return	void
	 */
	function set_template($template)
	{
		if (! is_array($template))
		{
			return FALSE;
		}
	
		$this->template = $template;
	}

	// --------------------------------------------------------------------

	/**
	 * Set the table heading
	 *
	 * Can be passed as an array or discreet params
	 *
	 * @access	public
	 * @param	mixed
	 * @return	void
	 */
	function set_heading()
	{
		$args = func_get_args();
		$this->heading = (is_array($args[0])) ? $args[0] : $args;
	}

	// --------------------------------------------------------------------

	/**
	 * Set columns.  Takes a one-dimensional array as input and creates
	 * a multi-dimensional array with a depth equal to the number of
	 * columns.  This allows a single array with many elements to  be
	 * displayed in a table that has a fixed column count.
	 *
	 * @access	public
	 * @param	array
	 * @param	int
	 * @return	void
	 */
	function make_columns($array = array(), $col_limit = 0)
	{
		if (! is_array($array) OR count($array) == 0)
		{
			return FALSE;
		}
		
		// Turn off the auto-heading feature since it's doubtful we 
		// will want headings from a one-dimensional array
		$this->auto_heading = FALSE;
		
		if ($col_limit == 0)
		{
			return $array;
		}
	
		$new = array();
		while(count($array) > 0)
		{	
			$temp = array_splice($array, 0, $col_limit);
			
			if (count($temp) < $col_limit)
			{
				for ($i = count($temp); $i < $col_limit; $i++)
				{
					$temp[] = '&nbsp;';
				}
			}
			
			$new[] = $temp;
		}
		
		return $new;
	}

	// --------------------------------------------------------------------

	/**
	 * Set "empty" cells
	 *
	 * Can be passed as an array or discreet params
	 *
	 * @access	public
	 * @param	mixed
	 * @return	void
	 */
	function set_empty($value)
	{
		$this->empty_cells = $value;
	}
	
	// --------------------------------------------------------------------

	/**
	 * Add a table row
	 *
	 * Can be passed as an array or discreet params
	 *
	 * @access	public
	 * @param	mixed
	 * @return	void
	 */
	function add_row()
	{
		$args = func_get_args();
		$this->rows[] = (is_array($args[0])) ? $args[0] : $args;
	}

	// --------------------------------------------------------------------

	/**
	 * Add a table caption
	 *
	 * @access	public
	 * @param	string
	 * @return	void
	 */
	function set_caption($caption)
	{
		$this->caption = $caption;
	}	

	// --------------------------------------------------------------------

	/**
	 * Generate the table
	 *
	 * @access	public
	 * @param	mixed
	 * @return	string
	 */
	function generate($table_data = NULL)
	{
		// The table data can optionally be passed to this function
		// either as a database result object or an array
		if (! is_null($table_data))
		{
			if (is_object($table_data))
			{
				$this->_set_from_object($table_data);
			}
			elseif (is_array($table_data))
			{
				$set_heading = (count($this->heading) == 0 AND $this->auto_heading == FALSE) ? FALSE : TRUE;
				$this->_set_from_array($table_data, $set_heading);
			}
		}
	
		// Is there anything to display?  No?  Smite them!
		if (count($this->heading) == 0 AND count($this->rows) == 0)
		{
			return 'Undefined table data';
		}
	
		// Compile and validate the template date
		$this->_compile_template();
	
	
		// Build the table!
		
		$out = $this->template['table_open'];
		$out .= $this->newline;		

		// Add any caption here
		if ($this->caption)
		{
			$out .= $this->newline;
			$out .= '<caption>' . $this->caption . '</caption>';
			$out .= $this->newline;
		}

		// Is there a table heading to display?
		if (count($this->heading) > 0)
		{
			$out .= $this->template['heading_row_start'];
			$out .= $this->newline;		

			foreach($this->heading as $heading)
			{
				$out .= $this->template['heading_cell_start'];
				$out .= $heading;
				$out .= $this->template['heading_cell_end'];
			}

			$out .= $this->template['heading_row_end'];
			$out .= $this->newline;				
		}

		// Build the table rows
		if (count($this->rows) > 0)
		{
			$i = 1;
			foreach($this->rows as $row)
			{
				if (! is_array($row))
				{
					break;
				}
			
				// We use modulus to alternate the row colors
				$name = (fmod($i++, 2)) ? '' : 'alt_';
			
				$out .= $this->template['row_'.$name.'start'];
				$out .= $this->newline;		
	
				foreach($row as $cell)
				{
					$out .= $this->template['cell_'.$name.'start'];
					
					if ($cell === "")
					{
						$out .= $this->empty_cells;
					}
					else
					{
						$out .= $cell;
					}
					
					$out .= $this->template['cell_'.$name.'end'];
				}
	
				$out .= $this->template['row_'.$name.'end'];
				$out .= $this->newline;	
			}
		}

		$out .= $this->template['table_close'];
	
		return $out;
	}
	
	// --------------------------------------------------------------------

	/**
	 * Clears the table arrays.  Useful if multiple tables are being generated
	 *
	 * @access	public
	 * @return	void
	 */
	function clear()
	{
		$this->rows				= array();
		$this->heading			= array();
		$this->auto_heading		= TRUE;	
	}
	
	// --------------------------------------------------------------------

	/**
	 * Set table data from a database result object
	 *
	 * @access	public
	 * @param	object
	 * @return	void
	 */
	function _set_from_object($query)
	{
		if (! is_object($query))
		{
			return FALSE;
		}
		
		// First generate the headings from the table column names
		if (count($this->heading) == 0)
		{
			if (! method_exists($query, 'list_fields'))
			{
				return FALSE;
			}
			
			$this->heading = $query->list_fields();
		}
				
		// Next blast through the result array and build out the rows
		
		if ($query->num_rows() > 0)
		{
			foreach ($query->result_array() as $row)
			{
				$this->rows[] = $row;
			}
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Set table data from an array
	 *
	 * @access	public
	 * @param	array
	 * @return	void
	 */
	function _set_from_array($data, $set_heading = TRUE)
	{
		if (! is_array($data) OR count($data) == 0)
		{
			return FALSE;
		}
		
		$i = 0;
		foreach ($data as $row)
		{
			if (! is_array($row))
			{
				$this->rows[] = $data;
				break;
			}
						
			// If a heading hasn't already been set we'll use the first row of the array as the heading
			if ($i == 0 AND count($data) > 1 AND count($this->heading) == 0 AND $set_heading == TRUE)
			{
				$this->heading = $row;
			}
			else
			{
				$this->rows[] = $row;
			}
			
			$i++;
		}
	}

	// --------------------------------------------------------------------

	/**
	 * Compile Template
	 *
	 * @access	private
	 * @return	void
	 */
 	function _compile_template()
 	{ 	
 		if ($this->template == NULL)
 		{
 			$this->template = $this->_default_template();
 			return;
 		}
		
		$this->temp = $this->_default_template();
		foreach (array('table_open','heading_row_start', 'heading_row_end', 'heading_cell_start', 'heading_cell_end', 'row_start', 'row_end', 'cell_start', 'cell_end', 'row_alt_start', 'row_alt_end', 'cell_alt_start', 'cell_alt_end', 'table_close') as $val)
		{
			if (! isset($this->template[$val]))
			{
				$this->template[$val] = $this->temp[$val];
			}
		} 	
 	}
	
	// --------------------------------------------------------------------

	/**
	 * Default Template
	 *
	 * @access	private
	 * @return	void
	 */
	function _default_template()
	{
		return  array (
						'table_open' 			=> '<table border="0" cellpadding="4" cellspacing="0">',

						'heading_row_start' 	=> '<tr>',
						'heading_row_end' 		=> '</tr>',
						'heading_cell_start'	=> '<th>',
						'heading_cell_end'		=> '</th>',

						'row_start' 			=> '<tr>',
						'row_end' 				=> '</tr>',
						'cell_start'			=> '<td>',
						'cell_end'				=> '</td>',

						'row_alt_start' 		=> '<tr>',
						'row_alt_end' 			=> '</tr>',
						'cell_alt_start'		=> '<td>',
						'cell_alt_end'			=> '</td>',

						'table_close' 			=> '</table>'
					);	
	}
	

}