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// Copyright (C) 2019-2023 Aleo Systems Inc.
// This file is part of the snarkVM library.

// Licensed 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 super::*;

mod bytes;
mod parse;
mod serialize;

use std::collections::BTreeMap;

#[derive(Clone, PartialEq, Eq)]
pub struct VerifyingKey<N: Network> {
    /// The verifying key for the function.
    verifying_key: Arc<varuna::CircuitVerifyingKey<N::PairingCurve>>,
}

impl<N: Network> VerifyingKey<N> {
    /// Initializes a new verifying key.
    pub const fn new(verifying_key: Arc<varuna::CircuitVerifyingKey<N::PairingCurve>>) -> Self {
        Self { verifying_key }
    }

    /// Returns `true` if the proof is valid for the given public inputs.
    pub fn verify(&self, function_name: &str, inputs: &[N::Field], proof: &Proof<N>) -> bool {
        #[cfg(feature = "aleo-cli")]
        let timer = std::time::Instant::now();

        // Retrieve the verification parameters.
        let universal_verifier = N::varuna_universal_verifier();
        let fiat_shamir = N::varuna_fs_parameters();

        // Verify the proof.
        match Varuna::<N>::verify(universal_verifier, fiat_shamir, self, inputs, proof) {
            Ok(is_valid) => {
                #[cfg(feature = "aleo-cli")]
                println!(
                    "{}",
                    format!(" • Verified '{function_name}' (in {} ms)", timer.elapsed().as_millis()).dimmed()
                );
                is_valid
            }
            Err(error) => {
                #[cfg(feature = "aleo-cli")]
                println!("{}", format!(" • Verifier failed: {error}").dimmed());
                false
            }
        }
    }

    /// Returns `true` if the batch proof is valid for the given public inputs.
    #[allow(clippy::type_complexity)]
    pub fn verify_batch(locator: &str, inputs: Vec<(VerifyingKey<N>, Vec<Vec<N::Field>>)>, proof: &Proof<N>) -> bool {
        #[cfg(feature = "aleo-cli")]
        let timer = std::time::Instant::now();

        // Convert the instances.
        let keys_to_inputs: BTreeMap<_, _> =
            inputs.iter().map(|(verifying_key, inputs)| (verifying_key.deref(), inputs.as_slice())).collect();

        // Retrieve the verification parameters.
        let universal_verifier = N::varuna_universal_verifier();
        let fiat_shamir = N::varuna_fs_parameters();

        // Verify the batch proof.
        match Varuna::<N>::verify_batch(universal_verifier, fiat_shamir, &keys_to_inputs, proof) {
            Ok(is_valid) => {
                #[cfg(feature = "aleo-cli")]
                println!("{}", format!(" • Verified '{locator}' (in {} ms)", timer.elapsed().as_millis()).dimmed());
                is_valid
            }
            Err(error) => {
                #[cfg(feature = "aleo-cli")]
                println!("{}", format!(" • Verifier failed: {error}").dimmed());
                false
            }
        }
    }
}

impl<N: Network> Deref for VerifyingKey<N> {
    type Target = varuna::CircuitVerifyingKey<N::PairingCurve>;

    fn deref(&self) -> &Self::Target {
        &self.verifying_key
    }
}