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use crate::{
    num_bigint::BigUint,
    world_mock::{AccountData, AccountEsdt, BlockchainMock},
};
use alloc::vec::Vec;
use core::cell::RefCell;
use multiversx_sc::types::{heap::Address, LockableStaticBuffer};
use num_traits::Zero;
use std::{
    cell::{Ref, RefMut},
    collections::HashMap,
    rc::Rc,
};

use super::{
    BlockchainRng, BlockchainUpdate, TxCache, TxInput, TxManagedTypes, TxResult, TxStaticVars,
};

#[derive(Debug)]
pub struct TxContext {
    pub tx_input_box: Box<TxInput>,
    pub tx_cache: Rc<TxCache>,
    pub managed_types: RefCell<TxManagedTypes>,
    pub lockable_static_buffer_cell: RefCell<LockableStaticBuffer>,
    pub static_vars_cell: RefCell<TxStaticVars>,
    pub tx_result_cell: RefCell<TxResult>,
    pub b_rng: RefCell<BlockchainRng>,
    pub printed_messages: RefCell<Vec<String>>,
}

impl TxContext {
    pub fn new(tx_input: TxInput, tx_cache: TxCache) -> Self {
        let b_rng = RefCell::new(BlockchainRng::new(&tx_input, &tx_cache));
        TxContext {
            tx_input_box: Box::new(tx_input),
            tx_cache: Rc::new(tx_cache),
            managed_types: RefCell::new(TxManagedTypes::new()),
            lockable_static_buffer_cell: RefCell::new(LockableStaticBuffer::new()),
            static_vars_cell: RefCell::new(TxStaticVars::default()),
            tx_result_cell: RefCell::new(TxResult::empty()),
            b_rng,
            printed_messages: RefCell::new(Vec::new()),
        }
    }

    pub fn dummy() -> Self {
        let tx_cache = TxCache::new(Rc::new(BlockchainMock::new()));
        let contract_address = Address::from(&[b'c'; 32]);
        tx_cache.insert_account(AccountData {
            address: contract_address.clone(),
            nonce: 0,
            egld_balance: BigUint::zero(),
            storage: HashMap::new(),
            esdt: AccountEsdt::default(),
            username: Vec::new(),
            contract_path: None,
            contract_owner: None,
            developer_rewards: BigUint::zero(),
        });

        let tx_input = TxInput {
            from: contract_address.clone(),
            to: contract_address,
            tx_hash: b"dummy...........................".into(),
            ..Default::default()
        };

        let b_rng = RefCell::new(BlockchainRng::new(&tx_input, &tx_cache));
        TxContext {
            tx_input_box: Box::new(tx_input),
            tx_cache: Rc::new(tx_cache),
            managed_types: RefCell::new(TxManagedTypes::new()),
            lockable_static_buffer_cell: RefCell::new(LockableStaticBuffer::new()),
            static_vars_cell: RefCell::new(TxStaticVars::default()),
            tx_result_cell: RefCell::new(TxResult::empty()),
            b_rng,
            printed_messages: RefCell::new(Vec::new()),
        }
    }

    pub fn input_ref(&self) -> &TxInput {
        self.tx_input_box.as_ref()
    }

    pub fn blockchain_cache(&self) -> &TxCache {
        &self.tx_cache
    }

    pub fn blockchain_cache_rc(&self) -> Rc<TxCache> {
        self.tx_cache.clone()
    }

    pub fn blockchain_ref(&self) -> &BlockchainMock {
        self.tx_cache.blockchain_ref()
    }

    pub fn with_account<R, F>(&self, address: &Address, f: F) -> R
    where
        F: FnOnce(&AccountData) -> R,
    {
        self.tx_cache.with_account(address, f)
    }

    pub fn with_contract_account<R, F>(&self, f: F) -> R
    where
        F: FnOnce(&AccountData) -> R,
    {
        self.with_account(&self.tx_input_box.to, f)
    }

    pub fn with_account_mut<R, F>(&self, address: &Address, f: F) -> R
    where
        F: FnOnce(&mut AccountData) -> R,
    {
        self.tx_cache.with_account_mut(address, f)
    }

    pub fn with_contract_account_mut<R, F>(&self, f: F) -> R
    where
        F: FnOnce(&mut AccountData) -> R,
    {
        self.with_account_mut(&self.tx_input_box.to, f)
    }

    pub fn m_types_borrow(&self) -> Ref<TxManagedTypes> {
        self.managed_types.borrow()
    }

    pub fn m_types_borrow_mut(&self) -> RefMut<TxManagedTypes> {
        self.managed_types.borrow_mut()
    }

    pub fn result_borrow_mut(&self) -> RefMut<TxResult> {
        self.tx_result_cell.borrow_mut()
    }

    pub fn extract_result(&self) -> TxResult {
        self.tx_result_cell.replace(TxResult::empty())
    }

    pub fn rng_borrow_mut(&self) -> RefMut<BlockchainRng> {
        self.b_rng.borrow_mut()
    }

    pub fn create_new_contract(
        &self,
        new_address: &Address,
        contract_path: Vec<u8>,
        contract_owner: Address,
    ) {
        assert!(
            !self.tx_cache.blockchain_ref().account_exists(new_address),
            "Account already exists at deploy address."
        );

        self.tx_cache.insert_account(AccountData {
            address: new_address.clone(),
            nonce: 0,
            egld_balance: BigUint::zero(),
            storage: HashMap::new(),
            esdt: AccountEsdt::default(),
            username: Vec::new(),
            contract_path: Some(contract_path),
            contract_owner: Some(contract_owner),
            developer_rewards: BigUint::zero(),
        });
    }

    pub fn into_blockchain_updates(self) -> BlockchainUpdate {
        let tx_cache = Rc::try_unwrap(self.tx_cache).unwrap();
        tx_cache.into_blockchain_updates()
    }
}