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// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License.  You may obtain a copy of the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

use optee_teec::{Context, Operation, ParamNone, ParamTmpRef, Session, Uuid};
use proto::{Command, UUID};

fn random(session: &mut Session) -> optee_teec::Result<()> {
    let mut random_uuid = [0u8; 16];

    let p0 = ParamTmpRef::new_output(&mut random_uuid);
    let mut operation = Operation::new(0, p0, ParamNone, ParamNone, ParamNone);

    println!("Invoking TA to generate random UUID...");
    session.invoke_command(Command::RandomGenerator as u32, &mut operation)?;
    println!("Invoking done!");

    let generate_uuid = Uuid::from_slice(&random_uuid).unwrap();

    println!("Generate random UUID: {}", generate_uuid);
    Ok(())
}

fn main() -> optee_teec::Result<()> {
    let mut ctx = Context::new()?;

    let uuid = Uuid::parse_str(UUID).unwrap();
    let mut session = ctx.open_session(uuid)?;

    random(&mut session)?;

    println!("Success");
    Ok(())
}