tandem-types 0.4.25

Shared Tandem data types
Documentation 
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use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use serde_json::Value;
use uuid::Uuid;

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(rename_all = "snake_case")]
pub enum MessageRole {
    User,
    Assistant,
    System,
    Tool,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct Message {
    pub id: String,
    pub role: MessageRole,
    #[serde(default)]
    pub parts: Vec<MessagePart>,
    pub created_at: DateTime<Utc>,
}

impl Message {
    pub fn new(role: MessageRole, parts: Vec<MessagePart>) -> Self {
        Self {
            id: Uuid::new_v4().to_string(),
            role,
            parts,
            created_at: Utc::now(),
        }
    }
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "type", rename_all = "snake_case")]
pub enum MessagePart {
    Text {
        text: String,
    },
    Reasoning {
        text: String,
    },
    ToolInvocation {
        tool: String,
        args: Value,
        result: Option<Value>,
        error: Option<String>,
    },
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(tag = "type", rename_all = "snake_case")]
pub enum MessagePartInput {
    Text {
        text: String,
    },
    File {
        mime: String,
        filename: Option<String>,
        url: String,
    },
}