// Common types shared across all protocol implementations

use serde::{Deserialize, Serialize};

/// Helper function for serde default value
pub fn default_true() -> bool {
    true
}

/// Common trait for all generation requests across different APIs
pub trait GenerationRequest: Send + Sync {
    /// Check if the request is for streaming
    fn is_stream(&self) -> bool;

    /// Get the model name if specified
    fn get_model(&self) -> Option<&str>;

    /// Extract text content for routing decisions
    fn extract_text_for_routing(&self) -> String;
}

/// Helper type for string or array of strings
#[derive(Debug, Clone, Deserialize, Serialize)]
#[serde(untagged)]
pub enum StringOrArray {
    String(String),
    Array(Vec<String>),
}
impl StringOrArray {
    /// Get the number of items in the StringOrArray
    pub fn len(&self) -> usize {
        match self {
            StringOrArray::String(_) => 1,
            StringOrArray::Array(arr) => arr.len(),
        }
    }

    /// Check if the StringOrArray is empty
    pub fn is_empty(&self) -> bool {
        match self {
            StringOrArray::String(s) => s.is_empty(),
            StringOrArray::Array(arr) => arr.is_empty(),
        }
    }

    /// Convert to a vector of strings
    pub fn to_vec(&self) -> Vec<String> {
        match self {
            StringOrArray::String(s) => vec![s.clone()],
            StringOrArray::Array(arr) => arr.clone(),
        }
    }
}

/// LoRA adapter path - can be single path or batch of paths (SGLang extension)
#[derive(Debug, Clone, Deserialize, Serialize)]
#[serde(untagged)]
pub enum LoRAPath {
    Single(Option<String>),
    Batch(Vec<Option<String>>),
}