<?php

namespace Model;

require_once 'vendor/PicoFeed/Export.php';
require_once 'vendor/PicoFeed/Import.php';
require_once 'vendor/PicoFeed/Parser.php';
require_once 'vendor/PicoFeed/Reader.php';
require_once 'vendor/PicoTools/Crypto.php';
require_once 'vendor/SimpleValidator/Validator.php';
require_once 'vendor/SimpleValidator/Base.php';
require_once 'vendor/SimpleValidator/Validators/Required.php';
require_once 'vendor/SimpleValidator/Validators/Unique.php';
require_once 'vendor/SimpleValidator/Validators/MaxLength.php';
require_once 'vendor/SimpleValidator/Validators/MinLength.php';
require_once 'vendor/SimpleValidator/Validators/Integer.php';
require_once 'vendor/SimpleValidator/Validators/Equals.php';

use SimpleValidator\Validator;
use SimpleValidator\Validators;
use PicoFeed\Import;
use PicoFeed\Reader;
use PicoFeed\Export;


function export_feeds()
{
    $opml = new Export(get_feeds());
    return $opml->execute();
}


function import_feeds($content)
{
    $import = new Import($content);
    $feeds = $import->execute();

    if ($feeds) {

        $db = \PicoTools\singleton('db');

        $db->startTransaction();

        foreach ($feeds as $feed) {

            if (! $db->table('feeds')->eq('feed_url', $feed->feed_url)->count()) {

                $db->table('feeds')->save(array(
                    'title' => $feed->title,
                    'site_url' => $feed->site_url,
                    'feed_url' => $feed->feed_url
                ));
            }
        }

        $db->closeTransaction();

        return true;
    }

    return false;
}


function import_feed($url)
{
    $reader = new Reader;
    $reader->download($url);

    $parser = $reader->getParser();

    if ($parser !== false) {

        $feed = $parser->execute();

        $db = \PicoTools\singleton('db');

        if (! $db->table('feeds')->eq('feed_url', $reader->getUrl())->count()) {

            $rs = $db->table('feeds')->save(array(
                'title' => $feed->title,
                'site_url' => $feed->url,
                'feed_url' => $reader->getUrl()
            ));

            if ($rs) {

                $feed_id = $db->getConnection()->getLastId();
                update_items($feed_id, $feed->items);
            }
        }

        return true;
    }

    return false;
}


function get_feeds()
{
    return \PicoTools\singleton('db')
        ->table('feeds')
        ->asc('title')
        ->findAll();
}


function get_feed($feed_id)
{
    return \PicoTools\singleton('db')
        ->table('feeds')
        ->eq('id', $feed_id)
        ->findOne();
}


function remove_feed($feed_id)
{
    $db = \PicoTools\singleton('db');

    $db->table('items')->eq('feed_id', $feed_id)->remove();

    return $db->table('feeds')->eq('id', $feed_id)->remove();
}


function get_unread_items()
{
    return \PicoTools\singleton('db')
        ->table('items')
        ->columns('items.id', 'items.title', 'items.updated', 'items.url', 'feeds.site_url', 'items.content')
        ->join('feeds', 'id', 'feed_id')
        ->eq('status', 'unread')
        ->desc('updated')
        ->findAll();
}


function get_read_items()
{
    return \PicoTools\singleton('db')
        ->table('items')
        ->columns('items.id', 'items.title', 'items.updated', 'items.url', 'feeds.site_url')
        ->join('feeds', 'id', 'feed_id')
        ->eq('status', 'read')
        ->desc('updated')
        ->findAll();
}


function get_item($id)
{
    return \PicoTools\singleton('db')
        ->table('items')
        ->eq('id', $id)
        ->findOne();
}


function set_item_read($id)
{
    \PicoTools\singleton('db')
        ->table('items')
        ->eq('id', $id)
        ->save(array('status' => 'read'));
}


function flush_unread($id)
{
    \PicoTools\singleton('db')
        ->table('items')
        ->eq('status', 'unread')
        ->save(array('status' => 'removed'));
}


function flush_read($id)
{
    \PicoTools\singleton('db')
        ->table('items')
        ->eq('status', 'read')
        ->save(array('status' => 'removed'));
}


function update_feeds()
{
    foreach (get_feeds() as $feed) {

        $reader = new Reader;
        $reader->download($feed['feed_url']);
        $parser = $reader->getParser();

        if ($parser !== false) {

            update_items($feed['id'], $parser->execute()->items);
        }
    }
}


function update_feed($feed_id)
{
    $feed = get_feed($feed_id);

    $reader = new Reader;
    $reader->download($feed['feed_url']);
    $parser = $reader->getParser();

    if ($parser !== false) {

        update_items($feed['id'], $parser->execute()->items);
        return true;
    }

    return false;
}


function update_items($feed_id, array $items)
{
    $db = \PicoTools\singleton('db');

    $db->startTransaction();

    foreach ($items as $item) {

        if (! $db->table('items')->eq('id', $item->id)->count()) {

            $db->table('items')->save(array(
                'id' => $item->id,
                'title' => $item->title,
                'url' => $item->url,
                'updated' => $item->updated,
                'author' => $item->author,
                'content' => $item->content,
                'status' => 'unread',
                'feed_id' => $feed_id
            ));
        }
    }

    $db->closeTransaction();
}


function get_config()
{
    return \PicoTools\singleton('db')
        ->table('config')
        ->columns('username', 'history')
        ->findOne();
}


function get_user()
{
    return \PicoTools\singleton('db')
        ->table('config')
        ->columns('username', 'password')
        ->findOne();
}


function validate_login(array $values)
{
    $v = new Validator($values, array(
        new Validators\Required('username', 'The user name is required'),
        new Validators\MaxLength('username', 'The maximum length is 50 characters', 50),
        new Validators\Required('password', 'The password is required')
    ));

    $result = $v->execute();
    $errors = $v->getErrors();

    if ($result) {

        $user = get_user();

        if ($user && \PicoTools\Crypto\password_verify($values['password'], $user['password'])) {

            $_SESSION['user'] = $user;
        }
        else {

            $result = false;
            $errors['login'] = 'Bad username or password';
        }
    }

    return array(
        $result,
        $errors
    );
}


function validate_config_update(array $values)
{
    if (! empty($values['password'])) {

        $v = new Validator($values, array(
            new Validators\Required('username', 'The user name is required'),
            new Validators\MaxLength('username', 'The maximum length is 50 characters', 50),
            new Validators\Required('password', 'The password is required'),
            new Validators\MinLength('password', 'The minimum length is 6 characters', 6),
            new Validators\Required('confirmation', 'The confirmation is required'),
            new Validators\Equals('password', 'confirmation', 'Passwords doesn\'t match')
        ));
    }
    else {

        $v = new Validator($values, array(
            new Validators\Required('username', 'The user name is required'),
            new Validators\MaxLength('username', 'The maximum length is 50 characters', 50)
        ));
    }

    return array(
        $v->execute(),
        $v->getErrors()
    );
}


function save_config(array $values)
{
    $values['password'] = \PicoTools\Crypto\password_hash($values['password']);
    unset($values['confirmation']);

    return \PicoTools\singleton('db')->table('config')->update($values);
}