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use storage_proofs_core::api_version::ApiVersion;

/// Selects the challenge index used to determine the leaf challenge for PoSt
pub fn get_challenge_index(
    api_version: ApiVersion,
    sector_index: usize,
    challenge_count_per_sector: usize,
    challenge_index: usize,
) -> u64 {
    (match api_version {
        ApiVersion::V1_0_0 | ApiVersion::V1_1_0 => {
            sector_index * challenge_count_per_sector + challenge_index
        }
        ApiVersion::V1_2_0 => challenge_index,
    } as u64)
}