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use std::result;

use ex3_canister_types::chain::Chain;
use ex3_canister_types::wallet_identifier::WalletIdentifier;
use serde_bytes::ByteBuf;

use ex3_node_error::{Error, OtherError};
use ex3_node_types::deposit::Deposit;
use ex3_node_types::transaction::{ResetMainSecretRequest, WalletRegisterRequest};
use ex3_node_types::PublicKey;

pub type Result<T> = result::Result<T, Error>;

pub struct PayloadDecoder;

impl PayloadDecoder {
    /// Decode the payload to a wallet identifier
    /// The payload should be in the following format:
    /// `{chain}|{network}|{pub_key}`
    /// where chain, network and pub_key are hex encoded
    /// Used for the following transactions:
    /// - [TransactionType::WalletRegistration]
    pub fn decode_to_wallet_identifier(payload: &ByteBuf) -> Result<WalletIdentifier> {
        let payload_str = String::from_utf8(payload.as_ref().to_vec()).expect("should success");

        let hexes = payload_str.split('|').collect::<Vec<&str>>();

        if hexes.len() != 3 {
            return Err(OtherError::new("Invalid payload").into());
        }

        let chain_bytes = hex::decode(hexes[0]);
        let network_bytes = hex::decode(hexes[1]);
        let pub_key_bytes = hex::decode(hexes[2]);

        if chain_bytes.is_err() || network_bytes.is_err() || pub_key_bytes.is_err() {
            return Err(OtherError::new("Invalid payload").into());
        }

        let chain_bytes = chain_bytes.unwrap();
        let network = network_bytes.unwrap();
        let pub_key = pub_key_bytes.unwrap();

        if chain_bytes.len() != 4 || network.len() != 1 {
            return Err(OtherError::new("Invalid payload").into());
        }

        let chain_bytes: [u8; 4] = chain_bytes.try_into().unwrap();
        let chain: Chain = u32::from_be_bytes(chain_bytes).into();

        let pub_key: ByteBuf = ByteBuf::from(pub_key);

        let wallet_identifier = WalletIdentifier {
            chain,
            network: network[0],
            pub_key,
        };
        Ok(wallet_identifier)
    }

    /// Decode the payload to a deposit
    pub fn decode_to_deposit(payload: &ByteBuf) -> Result<Deposit> {
        match Deposit::cbor_decode(payload.as_ref()) {
            Ok(deposit) => Ok(deposit),
            Err(e) => Err(e.into()),
        }
    }

    /// Decode the payload to wallet register request
    /// The payload should be in the following format:
    /// `{chain}|{network}|{pub_key}`
    pub fn decode_to_wallet_register_request(payload: &ByteBuf) -> Result<WalletRegisterRequest> {
        let payload_str = String::from_utf8(payload.as_ref().to_vec()).expect("should success");

        let hexes = payload_str.split('|').collect::<Vec<&str>>();

        if hexes.len() != 3 {
            return Err(OtherError::new("Invalid payload").into());
        }

        let chain_bytes = hex::decode(hexes[0]);
        let network_bytes = hex::decode(hexes[1]);
        let pub_key_bytes = hex::decode(hexes[2]);

        if chain_bytes.is_err() || network_bytes.is_err() || pub_key_bytes.is_err() {
            return Err(OtherError::new("Invalid payload").into());
        }

        let chain_bytes = chain_bytes.unwrap();
        let network = network_bytes.unwrap();
        let pub_key = pub_key_bytes.unwrap();

        if chain_bytes.len() != 4 || network.len() != 1 {
            return Err(OtherError::new("Invalid payload").into());
        }

        let chain_bytes: [u8; 4] = chain_bytes.try_into().unwrap();
        let chain: Chain = u32::from_be_bytes(chain_bytes).into();

        let pub_key: ByteBuf = ByteBuf::from(pub_key);

        let wallet_register_request = WalletRegisterRequest {
            chain,
            network: network[0],
            pub_key,
        };
        Ok(wallet_register_request)
    }

    /// Decode the payload to reset main secret request
    /// The payload should be in the following format:
    /// ` {data.encrypted_pri_key}|{data.l2_pub_key}`
    pub fn decode_to_reset_main_secret_request(
        payload: &ByteBuf,
    ) -> Result<ResetMainSecretRequest> {
        let payload_str = String::from_utf8(payload.as_ref().to_vec()).expect("should success");

        let hexes = payload_str.split('|').collect::<Vec<&str>>();

        if hexes.len() != 2 {
            return Err(OtherError::new("Invalid payload").into());
        }

        let encrypted_pri_key = hex::decode(hexes[0]).unwrap();
        let l2_pub_key = hex::decode(hexes[1]).unwrap();

        if encrypted_pri_key.len() != 32 || l2_pub_key.len() != 32 {
            return Err(OtherError::new("Invalid payload").into());
        }

        let encrypted_pri_key: ByteBuf = ByteBuf::from(encrypted_pri_key);
        let l2_pub_key: PublicKey = ByteBuf::from(l2_pub_key);

        let reset_main_secret_request = ResetMainSecretRequest {
            encrypted_pri_key,
            l2_pub_key,
        };
        Ok(reset_main_secret_request)
    }
}