use crate::integrity::IntegrityState;

/// Monotonic transfer progress observed by the copy loop.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct TransferProgress {
    /// Absolute completed bytes, including `initial_completed_bytes`.
    completed_bytes: u64,
    /// Bytes written during this copy invocation only.
    session_bytes: u64,
    total_bytes: Option<u64>,
    completed_members: u64,
    total_members: Option<u64>,
}

impl TransferProgress {
    #[must_use]
    pub fn new(
        completed_bytes: u64,
        session_bytes: u64,
        total_bytes: Option<u64>,
        completed_members: u64,
        total_members: Option<u64>,
    ) -> Self {
        Self {
            completed_bytes,
            session_bytes,
            total_bytes,
            completed_members,
            total_members,
        }
    }

    #[must_use]
    pub fn completed_bytes(&self) -> u64 {
        self.completed_bytes
    }

    #[must_use]
    pub fn session_bytes(&self) -> u64 {
        self.session_bytes
    }

    #[must_use]
    pub fn total_bytes(&self) -> Option<u64> {
        self.total_bytes
    }

    #[must_use]
    pub fn completed_members(&self) -> u64 {
        self.completed_members
    }

    #[must_use]
    pub fn total_members(&self) -> Option<u64> {
        self.total_members
    }
}

/// Checkpoint boundary emitted when retained progress should be durable.
///
/// Concrete source and destination proofs are adapter-owned. Integrity covers
/// every byte hashed by the accountant supplied to the copy (prior seed plus
/// this session). Absolute digests require a seed whose `bytes_hashed` equals
/// `initial_completed_bytes`.
#[derive(Clone, Debug, Eq, PartialEq)]
pub struct TransferCheckpoint {
    completed_bytes: u64,
    session_bytes: u64,
    integrity: IntegrityState,
}

impl TransferCheckpoint {
    #[must_use]
    pub fn new(completed_bytes: u64, session_bytes: u64, integrity: IntegrityState) -> Self {
        Self {
            completed_bytes,
            session_bytes,
            integrity,
        }
    }

    #[must_use]
    pub fn completed_bytes(&self) -> u64 {
        self.completed_bytes
    }

    #[must_use]
    pub fn session_bytes(&self) -> u64 {
        self.session_bytes
    }

    #[must_use]
    pub fn integrity(&self) -> &IntegrityState {
        &self.integrity
    }
}