use crate::command::Command;
use crate::command::context::AdapterContext;
use crate::command::response::{CommandError, CommandResponse};

/// 输入适配器：将渠道特定输入转换为 Command
///
/// 不同渠道（CLI、WebSocket、HTTP 等）实现此 trait
/// 将各自的输入格式统一转换为 Command
pub trait InputAdapter: Send + Sync {
    /// 尝试将输入解析为 Command
    ///
    /// # Returns
    /// - `Ok(Some(Command))`：成功解析为命令
    /// - `Ok(None)`：不是命令（如普通聊天消息）
    /// - `Err(CommandError)`：解析错误（如缺少参数）
    fn try_parse(&self, input: &str, ctx: AdapterContext) -> Result<Option<Command>, AdapterError>;
}

/// 输出适配器：将 CommandResponse 转换为渠道特定输出
///
/// 不同渠道（CLI、WebSocket、HTTP 等）实现此 trait
/// 将统一的 CommandResponse 转换为自己的输出格式
pub trait OutputAdapter: Send + Sync {
    /// 输出类型
    type Output;

    /// 将 CommandResponse 转换为渠道特定输出
    fn adapt(&self, response: CommandResponse) -> Self::Output;
}

/// 适配器错误
#[derive(Debug, Clone)]
pub enum AdapterError {
    /// 缺少参数
    MissingArgument { expected: String },
    /// 解析错误
    ParseError { message: String },
    /// 不支持的命令
    UnsupportedCommand { command: String },
}

impl AdapterError {
    /// 创建缺少参数错误
    pub fn missing_argument(expected: impl Into<String>) -> Self {
        Self::MissingArgument {
            expected: expected.into(),
        }
    }

    /// 创建解析错误
    pub fn parse_error(message: impl Into<String>) -> Self {
        Self::ParseError {
            message: message.into(),
        }
    }

    /// 创建不支持命令错误
    pub fn unsupported_command(command: impl Into<String>) -> Self {
        Self::UnsupportedCommand {
            command: command.into(),
        }
    }
}

impl std::fmt::Display for AdapterError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        match self {
            AdapterError::MissingArgument { expected } => {
                write!(f, "Missing argument: expected {}", expected)
            }
            AdapterError::ParseError { message } => write!(f, "Parse error: {}", message),
            AdapterError::UnsupportedCommand { command } => {
                write!(f, "Unsupported command: {}", command)
            }
        }
    }
}

impl std::error::Error for AdapterError {}

impl From<AdapterError> for CommandError {
    fn from(err: AdapterError) -> Self {
        CommandError::new("ADAPTER_ERROR", err.to_string())
    }
}