<?php
/**
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program (see LICENSE.txt in the base directory.  If
 * not, see:.
 *
 * @link      <http://www.gnu.org/licenses/>.
 * @author    niel
 * @author    DariusIII
 * @copyright 2016 nZEDb, 2017 NNTmux
 */

namespace App\Models;

use Blacklight\utility\Utility;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\DB;
use Yadakhov\InsertOnDuplicateKey;
use Illuminate\Database\Eloquent\Model;

/**
 * Settings - model for settings table.
 */
class Settings extends Model
{
    use InsertOnDuplicateKey;
    public const REGISTER_STATUS_OPEN = 0;

    public const REGISTER_STATUS_INVITE = 1;

    public const REGISTER_STATUS_CLOSED = 2;

    public const ERR_BADUNRARPATH = -1;

    public const ERR_BADFFMPEGPATH = -2;

    public const ERR_BADMEDIAINFOPATH = -3;

    public const ERR_BADNZBPATH = -4;

    public const ERR_DEEPNOUNRAR = -5;

    public const ERR_BADTMPUNRARPATH = -6;

    public const ERR_BADNZBPATH_UNREADABLE = -7;

    public const ERR_BADNZBPATH_UNSET = -8;

    public const ERR_BAD_COVERS_PATH = -9;

    public const ERR_BAD_YYDECODER_PATH = -10;

    public const ERR_BADLAMEPATH = -11;

    public const ERR_SABCOMPLETEPATH = -12;

    /**
     * @var Command
     */
    protected $console;
    /**
     * @var array
     */
    protected $primaryKey = ['section', 'subsection', 'name'];

    /**
     * @var string
     */
    protected $table = 'settings';

    /**
     * @var bool
     */
    protected $dateFormat = false;

    /**
     * @var bool
     */
    public $timestamps = false;

    /**
     * @var bool
     */
    public $incrementing = false;

    /**
     * @var array
     */
    protected $guarded = [];

    private $dbVersion;

    /**
     * Adapted from https://laravel.io/forum/01-15-2016-overriding-eloquent-attributes.
     *
     * @param string $key
     * @return mixed
     */
    public function __get($key)
    {
        $override = self::query()->where('name', $key)->first();

        // If there's an override and no mutator has been explicitly defined on
        // the model then use the override value
        if ($override && ! $this->hasGetMutator($key)) {
            return $override->value;
        }

        // If the attribute is not overridden the use the usual __get() magic method
        return parent::__get($key);
    }

    /**
     * @param $console
     * @return bool
     * @throws \Exception
     */
    public static function hasAllEntries($console): bool
    {
        $filepath = Utility::pathCombine(['db', 'schema', 'data', '10-settings.tsv'], NN_RES);
        if (! file_exists($filepath)) {
            throw new \InvalidArgumentException("Unable to find {$filepath}");
        }
        $settings = file($filepath);

        if (! \is_array($settings)) {
            throw new \InvalidArgumentException('Settings is not an array!');
        }

        $setting = [];
        $dummy = array_shift($settings);
        $result = false;
        if ($dummy !== null) {
            if ($console) {
                $console->info('Verifying settings table...');
                $console->info('(section, subsection, name):');
            }
            $result = true;
            foreach ($settings as $line) {
                $message = '';
                [$setting['section'], $setting['subsection'], $setting['name']] =
                    explode("\t", $line);

                $value = self::settingValue(
                    [
                        'section'    => $setting['section'],
                        'subsection' => $setting['subsection'],
                        'name'       => $setting['name'],
                    ],
                    true
                );
                if ($value === null) {
                    $result = false;
                    $message = 'error';
                }

                if ($message !== '' && $console !== null) {
                    $console->error(" {$setting['section']}, {$setting['subsection']}, {$setting['name']}: "
                        .'MISSING!');
                }
            }
        }
        $console->info('Settings table has all the required data');

        return $result;
    }

    /**
     * Return a tree-like array of all or selected settings.
     *
     * @param bool $excludeUnsectioned If rows with empty 'section' field should be excluded.
     *		Note this doesn't prevent empty 'subsection' fields.
     * @return array
     * @throws \RuntimeException
     */
    public static function toTree($excludeUnsectioned = true): array
    {
        $results = self::query()->get()->all();

        $tree = [];
        if (\is_array($results)) {
            foreach ($results as $result) {
                if (! $excludeUnsectioned || ! empty($result['section'])) {
                    $tree[$result['section']][$result['subsection']][$result['name']] =
                        ['value' => $result['value'], 'hint' => $result['hint']];
                }
            }
        } else {
            throw new \RuntimeException(
                'NO results from Settings table! Check your table has been created and populated.'
            );
        }

        return $tree;
    }

    /**
     * Checks the supplied parameter is either a string or an array with single element. If
     * either the value is passed to Settings::dottedToArray() for conversion. Otherwise the
     * value is returned unchanged.
     *
     * @param $setting array|bool
     *
     * @return array|bool
     */
    public static function settingToArray($setting)
    {
        if (! \is_array($setting)) {
            $setting = self::dottedToArray($setting);
        } elseif (\count($setting) === 1) {
            $setting = self::dottedToArray($setting[0]);
        }

        return $setting;
    }

    /**
     * Return the value of supplied setting.
     * The setting can be either a normal condition array for the custom 'setting' finder or a
     * dotted string notation setting. Note that dotted notation will be converted to an array,
     * so it will be slower: Explicitly use the array format if speed it paramount.
     * Be aware that this method only returns the first of any values found, so make sure your
     * $setting produces a unique result.
     * @param bool|array $setting
     * @param bool $returnAlways Indicates if the method should throw an exception (false) or return
     *                           null on failure. Defaults to throwing an exception.
     *
     * @return string|null		 The setting's value, or null on failure IF 'returnAlways' is true.
     * @throws \Exception
     */
    public static function settingValue($setting, $returnAlways = false): ?string
    {
        $setting = self::settingToArray($setting);
        $result = self::query()->where([
                                                'section' => $setting['section'] ?? '',
                                                'subsection' => $setting['subsection'] ?? '',
                                                'name' => $setting['name'],
                                            ])->value('value');

        if ($result !== null) {
            $value = $result;
        } elseif ($returnAlways === false) {
            throw new \RuntimeException('Unable to fetch setting from Db!');
        } else {
            $value = null;
        }

        return $value;
    }

    protected static function dottedToArray($setting)
    {
        $result = [];
        if (\is_string($setting)) {
            $array = explode('.', $setting);
            $count = \count($array);
            if ($count > 3) {
                return false;
            }

            while (3 - $count > 0) {
                array_unshift($array, '');
                $count++;
            }
            list(
                $result['section'],
                $result['subsection'],
                $result['name']) = $array;
        } else {
            return false;
        }

        return $result;
    }

    /**
     * Returns the stored Db version string.
     *
     * @return string
     */
    public function getDbVersion(): string
    {
        return $this->dbVersion;
    }

    /**
     * @param string $requiredVersion The minimum version to compare against
     *
     * @return bool|null       TRUE if Db version is greater than or eaqual to $requiredVersion,
     * false if not, and null if the version isn't available to check against.
     */
    public function isDbVersionAtLeast($requiredVersion): ?bool
    {
        $this->fetchDbVersion();
        if (empty($this->dbVersion)) {
            return null;
        }

        return version_compare($requiredVersion, $this->dbVersion, '<=');
    }

    /**
     * Performs the fetch from the Db server and stores the resulting Major.Minor.Version number.
     */
    private function fetchDbVersion()
    {
        $result = DB::select('SELECT VERSION() AS version');

        if (! empty($result)) {
            $dummy = explode('-', $result[0]->version, 2);
            $this->dbVersion = $dummy[0];
        }
    }
}