<?php

namespace plugin\admin\app\common;


class RunCatching
{
    private mixed $value;
    private ?\Throwable $throwable;

    // 私有构造，只能通过内部创建
    private function __construct(mixed $value = null, ?\Throwable $throwable = null)
    {
        $this->value = $value;
        $this->throwable = $throwable;
    }

    // 构建成功结果
    public static function success(mixed $value): self
    {
        return new self($value, null);
    }

    // 构建失败结果
    public static function failure(\Throwable $e): self
    {
        return new self(null, $e);
    }

    // 是否成功
    public function isSuccess(): bool
    {
        return $this->throwable === null;
    }

    // 是否失败
    public function isFailure(): bool
    {
        return !$this->isSuccess();
    }

    // 获取结果，失败则抛出异常
    public function get(): mixed
    {
        if ($this->isFailure()) {
            throw $this->throwable;
        }
        return $this->value;
    }

    // 获取结果，失败返回 null
    public function getOrNull(): mixed
    {
        return $this->isSuccess() ? $this->value : null;
    }

    // 获取结果，失败返回默认值
    public function getOrDefault(mixed $default): mixed
    {
        return $this->isSuccess() ? $this->value : $default;
    }

    // 成功时执行
    public function onSuccess(callable $action): self
    {
        if ($this->isSuccess()) {
            $action($this->value);
        }
        return $this;
    }

    // 失败时执行
    public function onFailure(callable $action): self
    {
        if ($this->isFailure()) {
            $action($this->throwable);
        }
        return $this;
    }

    // 获取异常
    public function exception(): ?\Throwable
    {
        return $this->throwable;
    }
}