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use super::{ErrorApi, ManagedTypeApi, StorageReadApi};
use crate::{
    err_msg,
    storage::{self, StorageKey},
    types::{
        Address, BigUint, EsdtLocalRole, EsdtLocalRoleFlags, EsdtTokenData, ManagedAddress,
        ManagedBuffer, ManagedByteArray, TokenIdentifier, H256,
    },
};
use alloc::boxed::Box;

/// Interface to be used by the actual smart contract code.
///
/// Note: contracts and the api are not mutable.
/// They simply pass on/retrieve data to/from the protocol.
/// When mocking the blockchain state, we use the Rc/RefCell pattern
/// to isolate mock state mutability from the contract interface.
pub trait BlockchainApi:
    ErrorApi + ManagedTypeApi + Clone + Sized + StorageReadApi + 'static
{
    fn get_caller_legacy(&self) -> Address;

    fn get_caller(&self) -> ManagedAddress<Self> {
        ManagedAddress::from_address(&self.get_caller_legacy())
    }

    fn get_sc_address_legacy(&self) -> Address;

    fn get_sc_address(&self) -> ManagedAddress<Self> {
        ManagedAddress::from_address(&self.get_sc_address_legacy())
    }

    fn get_owner_address_legacy(&self) -> Address;

    fn get_owner_address(&self) -> ManagedAddress<Self> {
        ManagedAddress::from_address(&self.get_owner_address_legacy())
    }

    fn get_shard_of_address_legacy(&self, address: &Address) -> u32;

    fn get_shard_of_address(&self, address: &ManagedAddress<Self>) -> u32 {
        self.get_shard_of_address_legacy(&address.to_address())
    }

    fn is_smart_contract_legacy(&self, address: &Address) -> bool;

    fn is_smart_contract(&self, address: &ManagedAddress<Self>) -> bool {
        self.is_smart_contract_legacy(&address.to_address())
    }

    fn get_balance_legacy(&self, address: &Address) -> BigUint<Self>;

    fn get_balance(&self, address: &ManagedAddress<Self>) -> BigUint<Self> {
        self.get_balance_legacy(&address.to_address())
    }

    fn get_state_root_hash_legacy(&self) -> H256;

    #[inline]
    fn get_state_root_hash(&self) -> ManagedByteArray<Self, 32> {
        ManagedByteArray::new_from_bytes(self.get_state_root_hash_legacy().as_array())
    }

    fn get_tx_hash_legacy(&self) -> H256;

    fn get_tx_hash(&self) -> ManagedByteArray<Self, 32> {
        ManagedByteArray::new_from_bytes(self.get_tx_hash_legacy().as_array())
    }

    fn get_gas_left(&self) -> u64;

    fn get_block_timestamp(&self) -> u64;

    fn get_block_nonce(&self) -> u64;

    fn get_block_round(&self) -> u64;

    fn get_block_epoch(&self) -> u64;

    fn get_block_random_seed_legacy(&self) -> Box<[u8; 48]>;

    fn get_block_random_seed(&self) -> ManagedByteArray<Self, 48> {
        ManagedByteArray::new_from_bytes(&*self.get_block_random_seed_legacy())
    }

    fn get_prev_block_timestamp(&self) -> u64;

    fn get_prev_block_nonce(&self) -> u64;

    fn get_prev_block_round(&self) -> u64;

    fn get_prev_block_epoch(&self) -> u64;

    fn get_prev_block_random_seed_legacy(&self) -> Box<[u8; 48]>;

    fn get_prev_block_random_seed(&self) -> ManagedByteArray<Self, 48> {
        ManagedByteArray::new_from_bytes(&*self.get_prev_block_random_seed_legacy())
    }

    fn get_current_esdt_nft_nonce(
        &self,
        address: &ManagedAddress<Self>,
        token_id: &TokenIdentifier<Self>,
    ) -> u64;

    fn get_esdt_balance(
        &self,
        address: &ManagedAddress<Self>,
        token_id: &TokenIdentifier<Self>,
        nonce: u64,
    ) -> BigUint<Self>;

    fn get_esdt_token_data(
        &self,
        address: &ManagedAddress<Self>,
        token_id: &TokenIdentifier<Self>,
        nonce: u64,
    ) -> EsdtTokenData<Self>;

    /// Retrieves local roles for the token, by reading protected storage.
    /// TODO: rewrite using managed types
    fn get_esdt_local_roles(&self, token_id: &TokenIdentifier<Self>) -> EsdtLocalRoleFlags {
        let mut key = StorageKey::new(
            self.clone(),
            storage::protected_keys::ELROND_ESDT_LOCAL_ROLES_KEY,
        );
        key.append_managed_buffer(token_id.as_managed_buffer());
        let value_mb = storage::storage_get::<Self, ManagedBuffer<Self>>(self.clone(), &key);
        let value_len = value_mb.len();
        const DATA_MAX_LEN: usize = 300;
        if value_len > DATA_MAX_LEN {
            self.signal_error(err_msg::STORAGE_VALUE_EXCEEDS_BUFFER);
        }
        let mut data_buffer = [0u8; DATA_MAX_LEN];
        let _ = value_mb.load_slice(0, &mut data_buffer[..value_len]);

        let mut current_index = 0;

        let mut result = EsdtLocalRoleFlags::NONE;

        while current_index < value_len {
            // first character before each role is a \n, so we skip it
            current_index += 1;

            // next is the length of the role as string
            let role_len = data_buffer[current_index];
            current_index += 1;

            // next is role's ASCII string representation
            let end_index = current_index + role_len as usize;
            let role_name = &data_buffer[current_index..end_index];
            current_index = end_index;

            result |= EsdtLocalRole::from(role_name).to_flag();
        }

        result
    }
}