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use std::fmt::{self, Debug, Formatter};

use anyhow::{ensure, Result};
use serde::{Deserialize, Serialize};

use crate::types::{Commitment, UnpaddedBytesAmount};

#[derive(Clone, Default, PartialEq, Eq, Serialize, Deserialize)]
pub struct PieceInfo {
    pub commitment: Commitment,
    pub size: UnpaddedBytesAmount,
}

impl Debug for PieceInfo {
    fn fmt(&self, fmt: &mut Formatter<'_>) -> fmt::Result {
        fmt.debug_struct("PieceInfo")
            .field("commitment", &hex::encode(self.commitment))
            .field("size", &self.size)
            .finish()
    }
}

impl PieceInfo {
    pub fn new(commitment: Commitment, size: UnpaddedBytesAmount) -> Result<Self> {
        ensure!(commitment != [0; 32], "Invalid all zero commitment");
        Ok(PieceInfo { commitment, size })
    }
}