//! Call key derivation.

use crate::errors::to_js_err;
use wasm_bindgen::prelude::*;

/// Call keys for encrypted voice/video media.
///
/// Call `free()` when done to zeroize key material.
#[wasm_bindgen]
pub struct CallKeys {
    inner: Option<soliton::call::CallKeys>,
}

#[wasm_bindgen]
impl CallKeys {
    /// Current send key (32 bytes).
    #[wasm_bindgen(js_name = "sendKey")]
    pub fn send_key(&self) -> Result<Vec<u8>, JsValue> {
        let inner = self
            .inner
            .as_ref()
            .ok_or_else(|| crate::errors::js_error("call keys consumed"))?;
        Ok(inner.send_key().to_vec())
    }

    /// Current recv key (32 bytes).
    #[wasm_bindgen(js_name = "recvKey")]
    pub fn recv_key(&self) -> Result<Vec<u8>, JsValue> {
        let inner = self
            .inner
            .as_ref()
            .ok_or_else(|| crate::errors::js_error("call keys consumed"))?;
        Ok(inner.recv_key().to_vec())
    }

    /// Advance the call chain — derives fresh keys, zeroizes old ones.
    pub fn advance(&mut self) -> Result<(), JsValue> {
        let inner = self
            .inner
            .as_mut()
            .ok_or_else(|| crate::errors::js_error("call keys consumed"))?;
        inner.advance().map_err(to_js_err)
    }

    pub fn free(&mut self) {
        self.inner = None;
    }
}

impl CallKeys {
    pub fn from_inner(inner: soliton::call::CallKeys) -> Self {
        Self { inner: Some(inner) }
    }
}