#[cxx::bridge]
mod ffi {
    unsafe extern "C++" {
        include!("molview/include/rdkit_bridge.hpp");

        /// Return true when RDKit can parse the supplied SMILES.
        fn can_parse_smiles(smiles: &str) -> Result<bool>;

        /// Count valid molecule records in an in-memory SDF.
        fn count_sdf_molecules(sdf: &[u8]) -> Result<u64>;

        /// Render a SMILES molecule to PNG.
        fn render_smiles_png(smiles: &str) -> Result<Vec<u8>>;

        /// Render all valid molecule records in an SDF to a PNG grid.
        fn render_sdf_png(sdf: &[u8]) -> Result<Vec<u8>>;
    }
}

/// Check whether RDKit can parse a SMILES string.
///
/// An RDKit C++ exception is returned as a `cxx::Exception`.
pub fn can_parse_smiles(smiles: &str) -> Result<bool, cxx::Exception> {
    ffi::can_parse_smiles(smiles)
}

/// Count the valid molecules in an SDF byte stream.
///
/// Invalid individual records are skipped by the underlying supplier.
/// Structural errors that escape RDKit are returned as `cxx::Exception`.
pub fn count_sdf_molecules(sdf: &[u8]) -> Result<u64, cxx::Exception> {
    ffi::count_sdf_molecules(sdf)
}

/// Render a SMILES molecule to PNG.
pub fn render_smiles_png(smiles: &str) -> Result<Vec<u8>, cxx::Exception> {
    ffi::render_smiles_png(smiles)
}

/// Render all valid molecules in an SDF byte stream to a PNG grid.
pub fn render_sdf_png(sdf: &[u8]) -> Result<Vec<u8>, cxx::Exception> {
    ffi::render_sdf_png(sdf)
}