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#[cfg(test)]
mod g7xx_test;

use bytes::Bytes;

use crate::error::Result;
use crate::packetizer::Payloader;

/// G711Payloader payloads G711 packets
pub type G711Payloader = G7xxPayloader;
/// G722Payloader payloads G722 packets
pub type G722Payloader = G7xxPayloader;

#[derive(Default, Debug, Copy, Clone)]
pub struct G7xxPayloader;

impl Payloader for G7xxPayloader {
    /// Payload fragments an G7xx packet across one or more byte arrays
    fn payload(&mut self, mtu: usize, payload: &Bytes) -> Result<Vec<Bytes>> {
        if payload.is_empty() || mtu == 0 {
            return Ok(vec![]);
        }

        let mut payload_data_remaining = payload.len();
        let mut payload_data_index = 0;
        let mut payloads = Vec::with_capacity(payload_data_remaining / mtu);
        while payload_data_remaining > 0 {
            let current_fragment_size = std::cmp::min(mtu, payload_data_remaining);
            payloads.push(
                payload.slice(payload_data_index..payload_data_index + current_fragment_size),
            );

            payload_data_remaining -= current_fragment_size;
            payload_data_index += current_fragment_size;
        }

        Ok(payloads)
    }

    fn clone_to(&self) -> Box<dyn Payloader + Send + Sync> {
        Box::new(*self)
    }
}