/*
 * ‌
 * Hedera Rust SDK
 * ​
 * Copyright (C) 2022 - 2023 Hedera Hashgraph, LLC
 * ​
 * 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 hedera_proto::services;
use hedera_proto::services::token_service_client::TokenServiceClient;
use tonic::transport::Channel;

use crate::protobuf::{
    FromProtobuf,
    ToProtobuf,
};
use crate::transaction::{
    AnyTransactionData,
    ChunkInfo,
    ToSchedulableTransactionDataProtobuf,
    ToTransactionDataProtobuf,
    TransactionData,
    TransactionExecute,
};
use crate::{
    BoxGrpcFuture,
    Error,
    LedgerId,
    TokenId,
    Transaction,
    ValidateChecksums,
};

/// Mints tokens to the Token's treasury Account.
///
/// The operation increases the Total Supply of the Token. The maximum total supply a token can have
/// is 2^63-1.
///
/// The amount provided must be in the lowest denomination possible. Example: Token A has 2 decimals.
/// In order to mint 100 tokens, one must provide amount of 10000. In order to mint 100.55 tokens,
/// one must provide amount of 10055.
///
/// - If no Supply Key is defined, the transaction will resolve to `TokenHasNoSupplyKey`.
/// - If both amount and metadata list get filled, a `InvalidTransactionBody` response code will be
/// returned.
/// - If the metadata list contains metadata which is too large, a `MetadataTooLong` response code will
/// be returned.
/// - If neither the amount nor the metadata list get filled, a `InvalidTokenMintAmount` response code
/// will be returned.
/// - If the metadata list count is greater than the batch size limit global dynamic property, a
/// `BatchSizeLimitExceeded` response code will be returned.
pub type TokenMintTransaction = Transaction<TokenMintTransactionData>;

#[derive(Debug, Clone, Default)]
pub struct TokenMintTransactionData {
    /// The token for which to mint tokens.
    token_id: Option<TokenId>,

    /// The amount of a fungible token to mint to the treasury account.
    amount: u64,

    /// The list of metadata for a non-fungible token to mint to the treasury account.
    metadata: Vec<Vec<u8>>,
}

impl TokenMintTransaction {
    /// Returns the token for which to mint tokens.
    #[must_use]
    pub fn get_token_id(&self) -> Option<TokenId> {
        self.data().token_id
    }

    /// Sets the token for which to mint tokens.
    pub fn token_id(&mut self, token_id: impl Into<TokenId>) -> &mut Self {
        self.data_mut().token_id = Some(token_id.into());
        self
    }

    /// Returns the amount of a fungible token to mint to the treasury account.
    #[must_use]
    pub fn get_amount(&self) -> u64 {
        self.data().amount
    }

    /// Sets the amount of a fungible token to mint to the treasury account.
    pub fn amount(&mut self, amount: u64) -> &mut Self {
        self.data_mut().amount = amount;
        self
    }

    /// Returns the list of metadata for a non-fungible token to mint to the treasury account.
    #[must_use]
    pub fn get_metadata(&self) -> &[Vec<u8>] {
        &self.data().metadata
    }

    /// Sets the list of metadata for a non-fungible token to mint to the treasury account.
    pub fn metadata<Bytes>(&mut self, metadata: impl IntoIterator<Item = Bytes>) -> &mut Self
    where
        Bytes: AsRef<[u8]>,
    {
        self.data_mut().metadata =
            metadata.into_iter().map(|bytes| bytes.as_ref().to_vec()).collect();

        self
    }
}

impl TransactionData for TokenMintTransactionData {}

impl TransactionExecute for TokenMintTransactionData {
    fn execute(
        &self,
        channel: Channel,
        request: services::Transaction,
    ) -> BoxGrpcFuture<'_, services::TransactionResponse> {
        Box::pin(async { TokenServiceClient::new(channel).mint_token(request).await })
    }
}

impl ValidateChecksums for TokenMintTransactionData {
    fn validate_checksums(&self, ledger_id: &LedgerId) -> Result<(), Error> {
        self.token_id.validate_checksums(ledger_id)
    }
}

impl ToTransactionDataProtobuf for TokenMintTransactionData {
    fn to_transaction_data_protobuf(
        &self,
        chunk_info: &ChunkInfo,
    ) -> services::transaction_body::Data {
        let _ = chunk_info.assert_single_transaction();

        services::transaction_body::Data::TokenMint(self.to_protobuf())
    }
}

impl ToSchedulableTransactionDataProtobuf for TokenMintTransactionData {
    fn to_schedulable_transaction_data_protobuf(
        &self,
    ) -> services::schedulable_transaction_body::Data {
        services::schedulable_transaction_body::Data::TokenMint(self.to_protobuf())
    }
}

impl From<TokenMintTransactionData> for AnyTransactionData {
    fn from(transaction: TokenMintTransactionData) -> Self {
        Self::TokenMint(transaction)
    }
}

impl FromProtobuf<services::TokenMintTransactionBody> for TokenMintTransactionData {
    fn from_protobuf(pb: services::TokenMintTransactionBody) -> crate::Result<Self> {
        Ok(Self {
            token_id: Option::from_protobuf(pb.token)?,
            amount: pb.amount,
            metadata: pb.metadata,
        })
    }
}

impl ToProtobuf for TokenMintTransactionData {
    type Protobuf = services::TokenMintTransactionBody;

    fn to_protobuf(&self) -> Self::Protobuf {
        services::TokenMintTransactionBody {
            token: self.token_id.to_protobuf(),
            amount: self.amount,
            metadata: self.metadata.clone(),
        }
    }
}