<?php
require_once(__DIR__.'/ArrayExtended.php');
class CSVReader
{
    private $file_path = '';
    private $params = array('enable_skip_line' => false, 'separator' => ',', 'enclosure' => '"', 'expected_header' => array());
    private $handlers = array('start' => null, 'error' => null);
    private $current_num_line = 0;
    
    function __construct($file_path)
    {
        $this->file_path = $file_path;
        $this->handlers = array(
            'start' => function() {},
            'error' => function($failed_line_number) {},
            'readline' => function(ArrayExtended $cols) { return true; }
        );
    }

    function setSeparator($separator)
    {
        $this->params['separator'] = $separator;
        return $this;
    }

    function setEnclosure($enclosure)
    {
        $this->params['enclosure'] = $enclosure;
        return $this;
    }

    function setExpectedHeader(array $expected_header)
    {
        $this->params['expected_header'] = $expected_header;
        return $this;
    }

    function enableSkipHeader()
    {
        $this->params['enable_skip_line'] = true;
        return $this;
    }

    // func : function()
    function setOnStart(callable $func)
    {
        $this->handlers['start'] = $func;
        return $this;
    }

    // func : function(ArrayExtended $columns)
    function setOnEachLine(callable $func)
    {
        $this->handlers['readline'] = $func;
        return $this;
    }

    // func : function(int failed_line_number)
    function setOnError(callable $func)
    {
        $this->handlers['error'] = $func;
        return $this;
    }

    function readLines()
    {
        $ok = false;
        $this->current_num_line = 0;

        $f = fopen($this->file_path, 'r');
        if ($f) {
            call_user_func($this->handlers['start']);

            $ok = true;
            if ($this->params['enable_skip_line']) {
                $ok = $this->checkHeader(fgetcsv($f, 0, $this->params['separator'], $this->params['enclosure']));
            }

            while ($ok && ($cols = fgetcsv($f, 0, $this->params['separator'], $this->params['enclosure']))) {
                $ok = call_user_func($this->handlers['readline'], new ArrayExtended($cols));
                $this->current_num_line++;
            }

            fclose($f);
        }
    
        if (!$ok) {
            call_user_func($this->handlers['error'], $this->current_num_line);
        }

        return $ok;
    }

    private function checkHeader(array $cols)
    {
        $ok = true;

        foreach($this->params['expected_header'] as $expected_col => $expected_pos) {
            $found = false;               
            foreach($cols as $index => $col) {
                if (strtolower($col) == strtolower($expected_col) && $expected_pos == $index) {
                    $found = true;
                    break;
                }
            }
            $ok = $ok && $found;
        }

        return $ok;
    }
}