<?php

//-------------------------------------------------------------------------------
// CSV_Module.php
// Handle checking, parsing, and writing of comma separated value (csv) files 
//
// written by Bart Meganck, Royal Museum for Central Africa
// bart.meganck@africamuseum.be
//
//
// This program is free & open source, under the GNU General Public License, v.2
// See : http://www.gnu.org/copyleft/gpl.html for more details.
//
//-------------------------------------------------------------------------------

class CSV_module
{

	// array of arrays for storing point data
	private $points_array = array (

		 "id_array" => array(),
		 "name_array" => array(),
		 "latitude_array" => array(),
		 "longitude_array" => array(),
		 "coord_accuracy_array" => array(),
		 "begin_date_array" => array(),
		 "end_date_array" => array()
 
		 );
		 
		 
	private $input_file;
	private $input_line;
	private $input_fields = array();
	private $point_count = 0;
	private $output_file;
	private $return_string = "";
	
	// public function checkCSVFile($input_file_path) {
	
		// check number of input_fields
		// check the used field delimiter
		// check first line : column headers or not ?
		// check each field, common errors like lat/lon switching 
	
	//	} // function checkCSVFile 
	
	public function readPointsFromCSVFile($input_file_path) {
	
		$this->point_count = 0;
	
		$this->input_file = fopen($input_file_path,"r");
		
		$this->input_line = fgets($this->input_file);
		
		while (!feof($this->input_file)) {
		
		
			// for the moment, we expect the delimiter to be a blank space
			// TODO : make this dynamic with a parameter
			$this->input_fields = explode(" ", $this->input_line);

			$this->points_array["id_array"][$this->point_count] = $this->input_fields[0];
			$this->points_array["name_array"][$this->point_count] = $this->input_fields[1];
			$this->points_array["latitude_array"][$this->point_count] = $this->input_fields[2];
			$this->points_array["longitude_array"][$this->point_count] = $this->input_fields[3];
			$this->points_array["coord_accuracy_array"][$this->point_count] = $this->input_fields[4];
			$this->points_array["begin_date_array"][$this->point_count] = $this->input_fields[5];
			$this->points_array["end_date_array"][$this->point_count] = $this->input_fields[6];
			
			$this->input_line = fgets($this->input_file);
			$this->point_count++;
		
		} 
		
		fclose($this->input_file);
	
		return($this->points_array);
	
	} //function readPointsFromCSVFile

	
	public function writePointsToCSVFile($points_array,$output_file_path) {
	
		$this->point_count = 0;
	
		$this->output_file = fopen($output_file_path,'w');
			
		// TODO : column headers could come straight from the points array keys
		// with a foreach-loop : that would be nicer and more dynamic		
		fwrite ($this->output_file,"unique_id id name lat lon accuracy begin_date end_date\n");
		//fwrite ($this->output_file," ");
		
		foreach ($points_array["unique_id_array"] as $dummy) {
		
		  // TODO : it would be neat to do this with an "explode" function, but
		  //   array structure has to be adapted for that
		  
		  // TODO : leave the choice of delimiter
		
			fwrite ($this->output_file,$points_array["unique_id_array"][$this->point_count]);
			fwrite ($this->output_file," ");
			fwrite ($this->output_file,$points_array["id_array"][$this->point_count]);
			fwrite ($this->output_file," ");
			fwrite ($this->output_file,$points_array["name_array"][$this->point_count]);
			fwrite ($this->output_file," ");
			fwrite ($this->output_file,$points_array["latitude_array"][$this->point_count]);
			fwrite ($this->output_file," ");
			fwrite ($this->output_file,$points_array["longitude_array"][$this->point_count]);
			fwrite ($this->output_file," ");
			fwrite ($this->output_file,$points_array["coord_accuracy_array"][$this->point_count]);
			fwrite ($this->output_file," ");
			fwrite ($this->output_file,$points_array["begin_date_array"][$this->point_count]);
			fwrite ($this->output_file," ");
			fwrite ($this->output_file,$points_array["end_date_array"][$this->point_count]);
			//fwrite ($this->output_file,"\n");
			
			$this->point_count++;
		
		} // foreach
		
		fclose($this->output_file);
		
		return($this->returnString);
	
	
	} // function writePointsToCSVFile
	
			 
} // class CSV_module

?>