<?php

namespace app\flow\vo;

use app\flow\enum\VoiceMessage;

/**
 * 语音状态值对象
 * 封装语音播报相关状态（不可变）
 */
readonly class VoiceState
{
    public function __construct(
        /** 语音播报内容 */
        public string $message = '',
        /** 错误消息枚举 */
        public VoiceMessage $errorMessage = VoiceMessage::NONE,
        /** 期望下一步提示 */
        public VoiceMessage $expectedNextStep = VoiceMessage::NONE,
        /** 语音模板参数 */
        public array $templateParams = [],
    ) {}

    /**
     * 创建空语音状态
     */
    public static function empty(): self
    {
        return new self();
    }

    /**
     * 从消息创建
     */
    public static function fromMessage(string|VoiceMessage $message): self
    {
        if ($message instanceof VoiceMessage) {
            return new self(message: $message->value);
        }
        return new self(message: $message);
    }

    /**
     * 从错误枚举创建
     */
    public static function fromError(VoiceMessage $error): self
    {
        return new self(errorMessage: $error);
    }

    /**
     * 设置语音消息
     */
    public function withMessage(string|VoiceMessage $message): self
    {
        $msg = $message instanceof VoiceMessage ? $message->value : $message;
        return new self(
            message: $msg,
            errorMessage: $this->errorMessage,
            expectedNextStep: $this->expectedNextStep,
            templateParams: $this->templateParams
        );
    }

    /**
     * 设置错误消息
     */
    public function withError(VoiceMessage $error): self
    {
        return new self(
            message: $this->message,
            errorMessage: $error,
            expectedNextStep: $this->expectedNextStep,
            templateParams: $this->templateParams
        );
    }

    /**
     * 设置期望下一步
     */
    public function withExpectedNextStep(VoiceMessage $expected): self
    {
        return new self(
            message: $this->message,
            errorMessage: $this->errorMessage,
            expectedNextStep: $expected,
            templateParams: $this->templateParams
        );
    }

    /**
     * 添加语音前缀
     */
    public function prependMessage(string $prefix): self
    {
        return new self(
            message: $prefix . $this->message,
            errorMessage: $this->errorMessage,
            expectedNextStep: $this->expectedNextStep,
            templateParams: $this->templateParams
        );
    }

    /**
     * 设置模板参数
     */
    public function withTemplateParams(array $params): self
    {
        return new self(
            message: $this->message,
            errorMessage: $this->errorMessage,
            expectedNextStep: $this->expectedNextStep,
            templateParams: $params
        );
    }

    /**
     * 获取完整语音（优先返回 message，否则返回 errorMessage）
     */
    public function getFullVoice(): string
    {
        if (!empty($this->message)) {
            return $this->message;
        }
        return $this->errorMessage->value;
    }

    /**
     * 是否有错误
     */
    public function hasError(): bool
    {
        return $this->errorMessage !== VoiceMessage::NONE;
    }

    /**
     * 是否有期望下一步提示
     */
    public function hasExpectedNextStep(): bool
    {
        return $this->expectedNextStep !== VoiceMessage::NONE;
    }

    /**
     * 转换为数组
     */
    public function toArray(): array
    {
        return [
            'message' => $this->message,
            'errorMessage' => $this->errorMessage->name,
            'expectedNextStep' => $this->expectedNextStep->name,
            'templateParams' => $this->templateParams,
        ];
    }
}