<?php


class Tribe__Events__Changelog_Reader {
	protected $version_count = 3;
	protected $readme_file = '';

	public function __construct( $version_count = 3, $readme_file = '' ) {
		$this->version_count = (int)$version_count;
		$this->readme_file = empty($readme_file) ? $this->default_readme_file() : $readme_file;
	}

	protected function default_readme_file() {
		return dirname(dirname(__FILE__)).'/readme.txt';
	}

	public function get_changelog() {
		$contents = $this->extract_changelog_section();
		$lines = explode("\n", $contents);

		$sections = array();
		$current_section = '';
		foreach ( $lines as $line ) {
			$line = trim($line);
			if ( substr($line, 0, 1) == "=" ) {
				if ( count($sections) >= $this->version_count ) {
					break;
				}
				$header = trim( $line, "= " );
				$current_section = $header;
				$sections[$current_section] = array();
			} elseif ( strlen($line) > 0 ) {
				$message = trim( $line, "* " );
				$sections[$current_section][] = $message;
			}
		}
		return $sections;
	}

	protected function extract_changelog_section() {
		$contents = $this->get_readme_file_contents();
		$start = strpos( $contents, '== Changelog ==' );
		if ( $start === FALSE ) {
			return '';
		}
		$start += 16; // account for the length of the header
		$end = strpos( $contents, '==', $start );
		return trim(substr( $contents, $start, $end - $start ));
	}

	protected function get_readme_file_contents() {
		return file_get_contents($this->readme_file);
	}
}