<?php

namespace App\Services;

use App\Models\Setting;
use Illuminate\Contracts\Cache\Repository as Cache;
use Illuminate\Database\Eloquent\ModelNotFoundException;
use Illuminate\Support\Arr;

class SettingService
{
    /**
     * @var array
     */
    protected $items = [];

    /**
     * @var integer
     */
    protected $ttl = 1800;

    /**
     * @param \Illuminate\Contracts\Cache\Repository $cache
     */
    public function __construct(
        protected Cache $cache,
    ) {
    }

    /**
     * @param array|string $key
     * @param mixed $default
     * @return mixed
     */
    public function get($key, $default = null)
    {
        if (is_array($key)) {
            return $this->getMany($key);
        }

        $_key = $this->getSettingKey($key);

        if (! array_key_exists($_key, $this->items)) {
            try {
                $this->items[$_key] = $this->cache->remember($this->cacheKey($_key), $this->ttl, function () use ($_key) {
                    $settings = Setting::where('key', $_key)->firstOrFail();

                    return $settings->value;
                });
            } catch (ModelNotFoundException $e) {
                return $default;
            }
        }

        return Arr::get($this->items, $key, $default);
    }

    /**
     * @param array $keys
     * @return array
     */
    public function getMany(array $keys)
    {
        $settings = [];

        foreach ($keys as $key => $default) {
            if (is_numeric($key)) {
                [$key, $default] = [$default, null];
            }

            $settings[$key] = $this->get($key, $default);
        }

        return $settings;
    }

    /**
     * @param array|string $key
     * @param mixed $value
     * @return void
     */
    public function set($key, $value = null)
    {
        $keys = is_array($key) ? $key : [$key => $value];

        foreach ($keys as $key => $value) {
            $_key = $this->getSettingKey($key);

            $setting = Setting::firstOrNew(['key' => $_key]);

            if (strpos($key, '.') === false) {
                $setting->value = $value;
            } else {
                $json = [$_key => $setting->value];

                data_set($json, $key, $value);

                $setting->value = $json[$_key];
            }
            $setting->save();

            $this->cleanCache($key);
        }
    }

    /**
     * @param string $key
     * @return void
     */
    public function cleanCache(string $key): void
    {
        $_key = $this->getSettingKey($key);
        unset($this->items[$_key]);

        $this->cache->forget($this->cacheKey($_key));
    }

    /**
     * @param string $key
     * @return string
     */
    protected function cacheKey(string $key): string
    {
        return "settings.{$key}";
    }

    /**
     * 获取设置项的 key
     *
     * @param string $key
     * @return string
     */
    protected function getSettingKey(string $key): string
    {
        if (strpos($key, '.') === false) {
            return $key;
        }

        $segments = explode('.', $key);

        return $segments[0];
    }
}