<?php
/**
 * COPS (Calibre OPDS PHP Server) class file
 *
 * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
 * @author     Sébastien Lucas <sebastien@slucas.fr>
 */

require_once('base.php');

class Author extends Base {
    const ALL_AUTHORS_ID = "cops:authors";

    const AUTHOR_COLUMNS = "authors.id as id, authors.name as name, authors.sort as sort, count(*) as count";
    const SQL_AUTHORS_BY_FIRST_LETTER = "select {0} from authors, books_authors_link where author = authors.id and upper (authors.sort) like ? group by authors.id, authors.name, authors.sort order by sort";
    const SQL_ALL_AUTHORS = "select {0} from authors, books_authors_link where author = authors.id group by authors.id, authors.name, authors.sort order by sort";

    public $id;
    public $name;
    public $sort;

    public function __construct($pid, $pname) {
        $this->id = $pid;
        $this->name = $pname;
    }

    public function getUri () {
        return "?page=".parent::PAGE_AUTHOR_DETAIL."&id=$this->id";
    }

    public function getEntryId () {
        return self::ALL_AUTHORS_ID.":".$this->id;
    }

    public static function getEntryIdByLetter ($startingLetter) {
        return self::ALL_AUTHORS_ID.":letter:".$startingLetter;
    }

    public static function getCount() {
        $nAuthors = parent::getDb ()->query('select count(*) from authors')->fetchColumn();
        $entry = new Entry (localize("authors.title"), self::ALL_AUTHORS_ID,
            str_format (localize("authors.alphabetical", $nAuthors), $nAuthors), "text",
            array ( new LinkNavigation ("?page=".parent::PAGE_ALL_AUTHORS)));
        return $entry;
    }

    public static function getAllAuthorsByFirstLetter() {
        $result = parent::getDb ()->query('select substr (upper (sort), 1, 1) as title, count(*) as count
from authors
group by substr (upper (sort), 1, 1)
order by substr (upper (sort), 1, 1)');
        $entryArray = array();
        while ($post = $result->fetchObject ())
        {
            array_push ($entryArray, new Entry ($post->title, Author::getEntryIdByLetter ($post->title),
                str_format (localize("authorword", $post->count), $post->count), "text",
                array ( new LinkNavigation ("?page=".parent::PAGE_AUTHORS_FIRST_LETTER."&id=". rawurlencode ($post->title)))));
        }
        return $entryArray;
    }

    public static function getAuthorsByStartingLetter($letter) {
        return self::getEntryArray (self::SQL_AUTHORS_BY_FIRST_LETTER, array ($letter . "%"));
    }

    public static function getAllAuthors() {
        return self::getEntryArray (self::SQL_ALL_AUTHORS, array ());
    }

    public static function getEntryArray ($query, $params) {
        list (, $result) = parent::executeQuery ($query, self::AUTHOR_COLUMNS, "", $params, -1);
        $entryArray = array();
        while ($post = $result->fetchObject ())
        {
            $author = new Author ($post->id, $post->sort);
            array_push ($entryArray, new Entry ($post->sort, $author->getEntryId (),
                str_format (localize("bookword", $post->count), $post->count), "text",
                array ( new LinkNavigation ($author->getUri ()))));
        }
        return $entryArray;
    }

    public static function getAuthorById ($authorId) {
        $result = parent::getDb ()->prepare('select sort from authors where id = ?');
        $result->execute (array ($authorId));
        return new Author ($authorId, $result->fetchColumn ());
    }

    public static function getAuthorByBookId ($bookId) {
        $result = parent::getDb ()->prepare('select authors.id as id, authors.sort as sort
from authors, books_authors_link
where author = authors.id
and book = ?');
        $result->execute (array ($bookId));
        $authorArray = array ();
        while ($post = $result->fetchObject ()) {
            array_push ($authorArray, new Author ($post->id, $post->sort));
        }
        return $authorArray;
    }
}