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use ckb_types::{
    bytes::Bytes,
    core::cell::CellMeta,
    packed::{Byte32, OutPoint},
};

/// TODO(doc): @quake
pub trait CellDataProvider {
    /// load cell_data from memory, fallback to storage access
    fn load_cell_data(&self, cell: &CellMeta) -> Option<Bytes> {
        cell.mem_cell_data
            .as_ref()
            .map(ToOwned::to_owned)
            .or_else(|| self.get_cell_data(&cell.out_point))
    }

    /// load cell_data_hash from memory, fallback to storage access
    fn load_cell_data_hash(&self, cell: &CellMeta) -> Option<Byte32> {
        cell.mem_cell_data_hash
            .as_ref()
            .map(ToOwned::to_owned)
            .or_else(|| self.get_cell_data_hash(&cell.out_point))
    }

    /// fetch cell_data from storage
    fn get_cell_data(&self, out_point: &OutPoint) -> Option<Bytes>;

    /// fetch cell_data_hash from storage
    fn get_cell_data_hash(&self, out_point: &OutPoint) -> Option<Byte32>;
}