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// Copyright 2021 Contributors to the Parsec project.
// SPDX-License-Identifier: Apache-2.0

use crate::{constants::StructureTag, tss2_esys::TPMI_ST_ATTEST, Error, Result, WrapperErrorKind};
use std::convert::TryFrom;

/// Type of attestation.
///
/// # Details
/// Corresponds to `TPMI_ST_ATTEST`.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum AttestationType {
    Certify,
    Quote,
    SessionAudit,
    CommandAudit,
    Time,
    Creation,
    Nv,
    NvDigest,
}

impl From<AttestationType> for StructureTag {
    fn from(native: AttestationType) -> Self {
        match native {
            AttestationType::Certify => StructureTag::AttestCertify,
            AttestationType::Quote => StructureTag::AttestQuote,
            AttestationType::SessionAudit => StructureTag::AttestSessionAudit,
            AttestationType::CommandAudit => StructureTag::AttestCommandAudit,
            AttestationType::Time => StructureTag::AttestTime,
            AttestationType::Creation => StructureTag::AttestCreation,
            AttestationType::Nv => StructureTag::AttestNv,
            AttestationType::NvDigest => StructureTag::AttestNvDigest,
        }
    }
}

impl TryFrom<StructureTag> for AttestationType {
    type Error = Error;

    fn try_from(structure_tag: StructureTag) -> Result<AttestationType> {
        match structure_tag {
            StructureTag::AttestCertify => Ok(AttestationType::Certify),
            StructureTag::AttestQuote => Ok(AttestationType::Quote),
            StructureTag::AttestSessionAudit => Ok(AttestationType::SessionAudit),
            StructureTag::AttestCommandAudit => Ok(AttestationType::CommandAudit),
            StructureTag::AttestTime => Ok(AttestationType::Time),
            StructureTag::AttestCreation => Ok(AttestationType::Creation),
            StructureTag::AttestNv => Ok(AttestationType::Nv),
            StructureTag::AttestNvDigest => Ok(AttestationType::NvDigest),
            _ => Err(Error::local_error(WrapperErrorKind::InvalidParam)),
        }
    }
}

impl From<AttestationType> for TPMI_ST_ATTEST {
    fn from(attestation_type: AttestationType) -> Self {
        StructureTag::from(attestation_type).into()
    }
}

impl TryFrom<TPMI_ST_ATTEST> for AttestationType {
    type Error = Error;

    fn try_from(tpmi_st_attest: TPMI_ST_ATTEST) -> Result<Self> {
        AttestationType::try_from(StructureTag::try_from(tpmi_st_attest)?)
    }
}