<?php

final class FeedParser
{

    public static function parse(string $file_path): Post
    {
        $post = new Post();
        $post->date = self::getDate($file_path);
        $post->id = preg_replace(ArticleParser::PATTERN_DATE, ArticleParser::REPLACE_REF, $file_path);
        $lines = file($file_path, FILE_IGNORE_NEW_LINES);
        foreach ($lines as $line) {
            if (substr($line, 0, 2) === "# ") {
                $post->title = substr($line, 2);
                continue;
            }
            if (preg_match(ArticleParser::PATTERN_TAGS, $line, $matches)) {
                $post->tags = explode(",", $matches[1]);
                break;
            }
        }
        $post->content = self::getContent($post->date, $post->id);
        return $post;
    }

    private static function getDate(string $file_path): int
    {
        $strdate = preg_replace(ArticleParser::PATTERN_DATE, ArticleParser::REPLACE_DATE, $file_path);
        list($year, $month, $day) = explode("-", $strdate, 3);
        $strtime = date("H:i:s", filemtime($file_path));
        list($hour, $minute, $second) = explode(":", $strtime);
        return mktime($hour, $minute, $second, $month, $day, $year);
    }

    private static function getContent(int $date, string $id): string
    {
        $file = "./data/cache/" . date("Y-m-d", $date) . "_${id}.phtml";
        ob_start();
        include $file;
        return ob_get_clean();
    }

}