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// Copyright 2023 MaidSafe.net limited.
//
// This SAFE Network Software is licensed to you under The General Public License (GPL), version 3.
// Unless required by applicable law or agreed to in writing, the SAFE Network Software distributed
// under the GPL Licence is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. Please review the Licences for the specific language governing
// permissions and limitations relating to use of the SAFE Network Software.

mod address;
mod builder;
mod cashnote;
mod nano;
mod reason_hash;
mod signed_spend;
mod transaction;
mod unique_keys;

pub(crate) use builder::TransactionBuilder;
pub(crate) use transaction::Input;

pub use address::SpendAddress;
pub use cashnote::CashNote;
pub use nano::NanoTokens;
pub use reason_hash::Hash;
pub use signed_spend::{SignedSpend, Spend};
pub use transaction::Transaction;
pub use unique_keys::{DerivationIndex, DerivedSecretKey, MainPubkey, MainSecretKey, UniquePubkey};

#[cfg(test)]
pub(crate) mod tests {
    use super::*;
    use crate::Error;
    use transaction::Output;

    #[test]
    fn from_hex_should_deserialize_a_hex_encoded_string_to_a_cashnote() -> Result<(), Error> {
        let mut rng = crate::rng::from_seed([0u8; 32]);
        let amount = 1_530_000_000;
        let main_key = MainSecretKey::random_from_rng(&mut rng);
        let derivation_index = UniquePubkey::random_derivation_index(&mut rng);
        let derived_key = main_key.derive_key(&derivation_index);
        let tx = Transaction {
            inputs: vec![],
            outputs: vec![Output::new(derived_key.unique_pubkey(), amount)],
        };
        let cashnote = CashNote {
            id: derived_key.unique_pubkey(),
            src_tx: tx,
            signed_spends: Default::default(),
            main_pubkey: main_key.main_pubkey(),
            derivation_index,
        };

        let hex = cashnote.to_hex()?;

        let cashnote = CashNote::from_hex(&hex)?;
        assert_eq!(cashnote.value()?.as_nano(), 1_530_000_000);

        Ok(())
    }

    #[test]
    fn to_hex_should_serialize_a_cashnote_to_a_hex_encoded_string() -> Result<(), Error> {
        let mut rng = crate::rng::from_seed([0u8; 32]);
        let amount = 100;
        let main_key = MainSecretKey::random_from_rng(&mut rng);
        let derivation_index = UniquePubkey::random_derivation_index(&mut rng);
        let derived_key = main_key.derive_key(&derivation_index);
        let tx = Transaction {
            inputs: vec![],
            outputs: vec![Output::new(derived_key.unique_pubkey(), amount)],
        };
        let cashnote = CashNote {
            id: derived_key.unique_pubkey(),
            src_tx: tx,
            signed_spends: Default::default(),
            main_pubkey: main_key.main_pubkey(),
            derivation_index,
        };

        let hex = cashnote.to_hex()?;
        let cashnote_from_hex = CashNote::from_hex(&hex)?;

        assert_eq!(cashnote.value()?, cashnote_from_hex.value()?);

        Ok(())
    }

    #[test]
    fn input_should_error_if_unique_pubkey_is_not_derived_from_main_key() -> Result<(), Error> {
        let mut rng = crate::rng::from_seed([0u8; 32]);
        let amount = 100;

        let main_key = MainSecretKey::random_from_rng(&mut rng);
        let derivation_index = UniquePubkey::random_derivation_index(&mut rng);
        let derived_key = main_key.derive_key(&derivation_index);

        let tx = Transaction {
            inputs: vec![],
            outputs: vec![Output::new(derived_key.unique_pubkey(), amount)],
        };

        let cashnote = CashNote {
            id: derived_key.unique_pubkey(),
            src_tx: tx,
            signed_spends: Default::default(),
            main_pubkey: main_key.main_pubkey(),
            derivation_index,
        };

        let other_main_key = MainSecretKey::random_from_rng(&mut rng);
        let result = cashnote.derived_key(&other_main_key);
        assert!(matches!(
            result,
            Err(Error::MainSecretKeyDoesNotMatchMainPubkey)
        ));
        Ok(())
    }

    #[test]
    fn test_cashnote_without_inputs_fails_verification() -> Result<(), Error> {
        let mut rng = crate::rng::from_seed([0u8; 32]);
        let amount = 100;

        let main_key = MainSecretKey::random_from_rng(&mut rng);
        let derivation_index = UniquePubkey::random_derivation_index(&mut rng);
        let derived_key = main_key.derive_key(&derivation_index);

        let tx = Transaction {
            inputs: vec![],
            outputs: vec![Output::new(derived_key.unique_pubkey(), amount)],
        };

        let cashnote = CashNote {
            id: derived_key.unique_pubkey(),
            src_tx: tx,
            signed_spends: Default::default(),
            main_pubkey: main_key.main_pubkey(),
            derivation_index,
        };

        assert!(matches!(
            cashnote.verify(&main_key),
            Err(Error::MissingTxInputs)
        ));

        Ok(())
    }
}