opi-ai 0.2.0

Unified multi-provider LLM API with streaming support
Documentation 
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//! Streaming response events (S7.3).

use serde::{Deserialize, Serialize};

// Legacy placeholder — replaced by AssistantStreamEvent in task 1.2.
#[derive(Debug, Clone)]
pub enum StreamEvent {
    Text(String),
    ToolCall {
        id: String,
        name: String,
        arguments: String,
    },
    Thinking(String),
    Usage {
        input_tokens: u32,
        output_tokens: u32,
    },
    Stop,
}

#[non_exhaustive]
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum StopReason {
    #[serde(rename = "stop")]
    Stop,
    #[serde(rename = "length")]
    Length,
    #[serde(rename = "tool_use")]
    ToolUse,
    #[serde(rename = "error")]
    Error,
    #[serde(rename = "aborted")]
    Aborted,
}

impl StopReason {
    pub fn as_str(self) -> &'static str {
        match self {
            Self::Stop => "stop",
            Self::Length => "length",
            Self::ToolUse => "tool_use",
            Self::Error => "error",
            Self::Aborted => "aborted",
        }
    }
}

#[derive(Debug, Clone, Default, PartialEq, Serialize, Deserialize)]
pub struct Usage {
    pub input_tokens: u32,
    pub output_tokens: u32,
}

#[non_exhaustive]
#[derive(Debug, Clone, PartialEq, Serialize)]
#[serde(tag = "type")]
pub enum AssistantStreamEvent {
    #[serde(rename = "start")]
    Start {
        partial: crate::message::AssistantMessage,
    },
    #[serde(rename = "text_start")]
    TextStart {
        content_index: usize,
        partial: crate::message::AssistantMessage,
    },
    #[serde(rename = "text_delta")]
    TextDelta {
        content_index: usize,
        delta: String,
        partial: crate::message::AssistantMessage,
    },
    #[serde(rename = "text_end")]
    TextEnd {
        content_index: usize,
        content: String,
        partial: crate::message::AssistantMessage,
    },
    #[serde(rename = "thinking_start")]
    ThinkingStart {
        content_index: usize,
        partial: crate::message::AssistantMessage,
    },
    #[serde(rename = "thinking_delta")]
    ThinkingDelta {
        content_index: usize,
        delta: String,
        partial: crate::message::AssistantMessage,
    },
    #[serde(rename = "thinking_end")]
    ThinkingEnd {
        content_index: usize,
        content: String,
        partial: crate::message::AssistantMessage,
    },
    #[serde(rename = "tool_call_start")]
    ToolCallStart {
        content_index: usize,
        partial: crate::message::AssistantMessage,
    },
    #[serde(rename = "tool_call_delta")]
    ToolCallDelta {
        content_index: usize,
        delta: String,
        partial: crate::message::AssistantMessage,
    },
    #[serde(rename = "tool_call_end")]
    ToolCallEnd {
        content_index: usize,
        tool_call: crate::message::ToolCall,
        partial: crate::message::AssistantMessage,
    },
    #[serde(rename = "done")]
    Done {
        reason: StopReason,
        message: crate::message::AssistantMessage,
    },
    #[serde(rename = "error")]
    Error {
        reason: StopReason,
        message: crate::message::AssistantMessage,
    },
}

impl AssistantStreamEvent {
    pub fn is_terminal(&self) -> bool {
        matches!(self, Self::Done { .. } | Self::Error { .. })
    }
}