// Copyright 2022. The Tari Project
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use tari_transaction_components::transaction_components::Transaction;

use crate::{
    chain_storage::{BlockchainBackend, BlockchainDatabase},
    consensus::BaseNodeConsensusManager,
    validation::{TransactionValidator, ValidationError, aggregate_body::AggregateBodyChainLinkedValidator},
};

pub struct TransactionChainLinkedValidator<B> {
    db: BlockchainDatabase<B>,
    aggregate_body_validator: AggregateBodyChainLinkedValidator,
}

impl<B: BlockchainBackend> TransactionChainLinkedValidator<B> {
    pub fn new(db: BlockchainDatabase<B>, consensus_manager: BaseNodeConsensusManager) -> Self {
        Self {
            aggregate_body_validator: AggregateBodyChainLinkedValidator::new(consensus_manager),
            db,
        }
    }
}

impl<B: BlockchainBackend> TransactionValidator for TransactionChainLinkedValidator<B> {
    fn validate(&self, tx: &Transaction) -> Result<(), ValidationError> {
        let consensus_constants = self.db.consensus_constants()?;
        // validate maximum tx weight
        if tx
            .calculate_weight(consensus_constants.transaction_weight_params())
            .map_err(|e| {
                ValidationError::SerializationError(format!("Unable to calculate the transaction weight: {e}"))
            })? >
            consensus_constants.max_block_transaction_weight()
        {
            return Err(ValidationError::MaxTransactionWeightExceeded);
        }

        {
            let db = self.db.db_read_access()?;
            let tip_header = db.fetch_tip_header()?;
            self.aggregate_body_validator
                .validate(&tx.body, tip_header.header(), &*db)?;
        };

        Ok(())
    }
}
