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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

use std::{path::Path, ptr};

use libc::{c_int, c_uint};

use crate::{
    consts::flags::{CryptActivate, CryptDeactivate},
    device::CryptDevice,
    err::LibcryptErr,
};

/// Handle for activation options
pub struct CryptActivationHandle<'a> {
    reference: &'a mut CryptDevice,
}

impl<'a> CryptActivationHandle<'a> {
    pub(crate) fn new(reference: &'a mut CryptDevice) -> Self {
        CryptActivationHandle { reference }
    }

    /// Activate device by passphrase.
    ///
    /// A value of `None` for the name will only check the passphrase and will
    /// not activate the keyslot.
    pub fn activate_by_passphrase(
        &mut self,
        name: Option<&str>,
        keyslot: Option<c_uint>,
        passphrase: &[u8],
        flags: CryptActivate,
    ) -> Result<c_uint, LibcryptErr> {
        let name_cstring_option = match name {
            Some(n) => Some(to_cstring!(n)?),
            None => None,
        };
        errno_int_success!(mutex!(libcryptsetup_rs_sys::crypt_activate_by_passphrase(
            self.reference.as_ptr(),
            match name_cstring_option {
                Some(ref cs) => cs.as_ptr(),
                None => ptr::null_mut(),
            },
            keyslot
                .map(|k| k as c_int)
                .unwrap_or(libcryptsetup_rs_sys::CRYPT_ANY_SLOT),
            to_byte_ptr!(passphrase),
            passphrase.len(),
            flags.bits(),
        )))
        .map(|k| k as c_uint)
    }

    /// Activate device by key file
    pub fn activate_by_keyfile_device_offset(
        &mut self,
        name: Option<&str>,
        keyslot: Option<c_uint>,
        keyfile: &Path,
        keyfile_size: Option<crate::size_t>,
        keyfile_offset: u64,
        flags: CryptActivate,
    ) -> Result<c_uint, LibcryptErr> {
        let name_cstring_option = match name {
            Some(n) => Some(to_cstring!(n)?),
            None => None,
        };
        let keyfile_cstring = path_to_cstring!(keyfile)?;
        errno_int_success!(mutex!(
            libcryptsetup_rs_sys::crypt_activate_by_keyfile_device_offset(
                self.reference.as_ptr(),
                match name_cstring_option {
                    Some(ref cs) => cs.as_ptr(),
                    None => ptr::null_mut(),
                },
                keyslot
                    .map(|k| k as c_int)
                    .unwrap_or(libcryptsetup_rs_sys::CRYPT_ANY_SLOT),
                keyfile_cstring.as_ptr(),
                match keyfile_size {
                    Some(i) => i,
                    None => std::fs::metadata(keyfile)
                        .map_err(LibcryptErr::IOError)?
                        .len() as crate::size_t,
                },
                keyfile_offset,
                flags.bits(),
            )
        ))
        .map(|k| k as c_uint)
    }

    /// Activate device by volume key
    pub fn activate_by_volume_key(
        &mut self,
        name: Option<&str>,
        volume_key: Option<&[u8]>,
        flags: CryptActivate,
    ) -> Result<(), LibcryptErr> {
        let name_cstring_option = match name {
            Some(n) => Some(to_cstring!(n)?),
            None => None,
        };
        let (volume_key_ptr, volume_key_len) = match volume_key {
            Some(vk) => (to_byte_ptr!(vk), vk.len()),
            None => (ptr::null(), 0),
        };
        errno!(mutex!(libcryptsetup_rs_sys::crypt_activate_by_volume_key(
            self.reference.as_ptr(),
            match name_cstring_option {
                Some(ref cs) => cs.as_ptr(),
                None => ptr::null_mut(),
            },
            volume_key_ptr,
            volume_key_len,
            flags.bits(),
        )))
    }

    /// Activeate device using passphrase in kernel keyring
    pub fn activate_by_keyring(
        &mut self,
        name: Option<&str>,
        key_description: &str,
        keyslot: Option<c_uint>,
        flags: CryptActivate,
    ) -> Result<c_uint, LibcryptErr> {
        let name_cstring_option = match name {
            Some(n) => Some(to_cstring!(n)?),
            None => None,
        };
        let description_cstring = to_cstring!(key_description)?;
        errno_int_success!(mutex!(libcryptsetup_rs_sys::crypt_activate_by_keyring(
            self.reference.as_ptr(),
            match name_cstring_option {
                Some(ref cs) => cs.as_ptr(),
                None => ptr::null_mut(),
            },
            description_cstring.as_ptr(),
            keyslot
                .map(|k| k as c_int)
                .unwrap_or(libcryptsetup_rs_sys::CRYPT_ANY_SLOT),
            flags.bits(),
        )))
        .map(|k| k as c_uint)
    }

    /// Deactivate crypt device
    pub fn deactivate(&mut self, name: &str, flags: CryptDeactivate) -> Result<(), LibcryptErr> {
        let name_cstring = to_cstring!(name)?;
        errno!(mutex!(libcryptsetup_rs_sys::crypt_deactivate_by_name(
            self.reference.as_ptr(),
            name_cstring.as_ptr(),
            flags.bits(),
        )))
    }
}