<?php

namespace App\Helpers;

use App\Models\Preference;
use Exception;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Log;

class Preferences
{
    private function setValue($key, $value, $isUserValue = false) {
        try {
            $userId = Auth::id();

            if ($isUserValue && is_null($userId)) {
                throw new Exception("User id can't be null for a user preference {$key}.");
            }

            $pref = Preference::where('key', $key);
            if ($isUserValue) {
                $pref = $pref->where('subjid', $userId);
            }

            if ($pref->count() > 0) {
                $pref->valstr = $value;
            } else {
                if ($isUserValue) {
                    throw new Exception("Preference {$key} not found for user {$userId}.");
                }
                throw new Exception("Preference {$key} not found.");
            }

        } catch (Exception $e) {
            header('HTTP/1.0 503 Service Unavailable');
            Log::info('Database error: ' . $e->getMessage());
        }
    }

    private function getValue($key, $isUserValue = false, $forceDefault = false) {
        try {
            $userId = Auth::id();

            if ($isUserValue && is_null($userId)) {
                throw new Exception("User id can't be null for a user preference {$key}.");
            }

            $pref = Preference::where('key', $key);
            if ($isUserValue) {
                $pref = $pref->where('subjid', $userId);
            }

            if ($pref->count() > 0) {
                return $pref->first()->valstr;
            } else {
                if ($isUserValue) {
                    throw new Exception("Preference {$key} not found for user {$userId}.");
                }
                throw new Exception("Preference {$key} not found.");
            }

        } catch (Exception $e) {
            header('HTTP/1.0 503 Service Unavailable');
            Log::info('Database error: ' . $e->getMessage());
            die();
        }
    }

    public function getDefaultTimeZone() {
        return config('app.timezone');
    }

    public static function setUserTimezone($timezone = null)
    {
        self::setValue('user_timezone', $timezone, true);
    }

    public static function getUserTimezone()
    {
        $timezone = self::getValue('user_timezone', true);
        if (!$timezone) {
            return self::getDefaultTimezone();
        }

        return $timezone;
    }

    // Always attempts to returns the current user's personal timezone setting
    public static function getTimezone()
    {
        $userId = Auth::id();

        if (!is_null($userId)) {
            return self::getUserTimezone();
        }

        return self::getDefaultTimezone();
    }
}