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//! qtum-address-rust
//!
//! Rust lib for en/decoding address to Qtum/Ethereum format
//!
//! ```rust
//! use qtum_address_rust::*;
//!
//! let addr = "qTTH1Yr2eKCuDLqfxUyBLCAjmomQ8pyrBt";
//!
//! let qtum = QtumAddress::new(QtumNetwork::Testnet); // testnet network prefix
//! let eth_addr = qtum.gethexaddress(addr).unwrap(); // 6c89a1a6ca2ae7c00b248bb2832d6f480f27da68
//! let qtum_addr = qtum.fromhexaddress(&eth_addr).unwrap(); // qTTH1Yr2eKCuDLqfxUyBLCAjmomQ8pyrBt
//!
//! assert_eq!(addr, qtum_addr)
//! ```
//!
use basex_rs::{BaseX, Decode, Encode, BITCOIN};
use bitcoin_hashes::sha256;
use bitcoin_hashes::Hash;
use hex;

/// Enum of Qtum networks
pub enum QtumNetwork {
    /// Prefix address - 0x3a
    Mainnet,
    /// Prefix address - 0x78
    Testnet,
}

impl QtumNetwork {
    /// Getting prefix byte from network type
    pub fn to_prefix_byte(&self) -> u8 {
        match self {
            QtumNetwork::Mainnet => 0x3a,
            QtumNetwork::Testnet => 0x78,
        }
    }
}

impl From<u8> for QtumNetwork {
    fn from(item: u8) -> Self {
        match item {
            0x3a => QtumNetwork::Mainnet,
            0x78 => QtumNetwork::Testnet,
            _ => panic!(""),
        }
    }
}

/// Structure for conversion ktum addresses
pub struct QtumAddress {
    prefix: u8,
}

impl QtumAddress {
    /// Initialization of the address conversion structure
    pub fn new(network: QtumNetwork) -> Self {
        Self {
            prefix: network.to_prefix_byte(),
        }
    }

    /// Converts a base58 pubkeyhash address to a hex address for use in smart contracts.
    pub fn gethexaddress(&self, address: &str) -> Result<String, &str> {
        if address.is_empty() {
            return Err("Invalid address");
        }

        let decode_bytes = match BaseX::new(BITCOIN).decode(address.to_string()) {
            Some(bytes) => bytes,
            None => return Err("Invalid address"),
        };

        let new_bytes = match decode_bytes.get(1..21) {
            Some(hash) => hash,
            None => return Err("Invalid address"),
        };

        let hex = hex::encode(new_bytes);

        Ok(hex)
    }

    /// Converts a raw hex address to a base58 pubkeyhash address
    pub fn fromhexaddress(&self, address: &str) -> Result<String, &str> {
        if address.is_empty() || address.len() != 40 {
            return Err("Invalid address");
        }

        let mut address_bytes = match hex::decode(address) {
            Ok(bytes) => bytes,
            Err(_) => return Err("Invalid address"),
        };
        address_bytes.insert(0, self.prefix);

        let checksum = self.hash(&self.hash(&address_bytes));
        match checksum.get(0..4) {
            Some(hash) => {
                for byte in hash.iter() {
                    address_bytes.push(*byte);
                }
            }
            None => return Err("Invalid address"),
        };

        let encode = BaseX::new(BITCOIN).encode(&address_bytes);

        Ok(encode)
    }

    /// Adding an ethereum address prefix
    pub fn addprefix(address: &str) -> String {
        format!("0x{}", address)
    }

    /// SHA256 hash function
    fn hash(&self, byte: &Vec<u8>) -> Vec<u8> {
        hex::decode(sha256::Hash::hash(byte.as_slice()).to_string()).unwrap()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn it_works_testnet() {
        let eth_addresses = [
            "6c89a1a6ca2ae7c00b248bb2832d6f480f27da68",
            "49a80104c0d27a9ba29678d07e87a57151107613",
            "7926223070547d2d15b2ef5e7383e541c338ffe9",
            "2352be3db3177f0a07efbe6da5857615b8c9901d",
            "69b004ac2b3993bf2fdf56b02746a1f57997420d",
            "8c647515f03daeefd09872d7530fa8d8450f069a",
            "2191744eb5ebeac90e523a817b77a83a0058003b",
            "88b0bf4b301c21f8a47be2188bad6467ad556dcf",
        ];

        let qtum_addresses = [
            "qTTH1Yr2eKCuDLqfxUyBLCAjmomQ8pyrBt",
            "qQGqkA16ZY6bCYy7Qjr77eU4BPsdadibCG",
            "qUbxboqjBRp96j3La8D1RYkyqx5uQbJPoW",
            "qLn9vqbr2Gx3TsVR9QyTVB5mrMoh4x43Uf",
            "qTCCy8qy7pW94EApdoBjYc1vQ2w68UnXPi",
            "qWMi6ne9mDQFatRGejxdDYVUV9rQVkAFGp",
            "qLcshhsRS6HKeTKRYFdpXnGVZxw96QQcfm",
            "qW28njWueNpBXYWj2KDmtFG2gbLeALeHfV",
        ];

        let qtum = QtumAddress::new(QtumNetwork::Testnet);

        for addr in qtum_addresses.iter() {
            let eth_addr = qtum.gethexaddress(addr).unwrap();
            let qtum_addr = qtum.fromhexaddress(&eth_addr).unwrap();
            assert_eq!(qtum_addr.to_string(), addr.to_string());
        }

        for addr in eth_addresses.iter() {
            let qtum_addr = qtum.fromhexaddress(addr).unwrap();
            let eth_addr = qtum.gethexaddress(&qtum_addr).unwrap();
            assert_eq!(eth_addr.to_string(), addr.to_string());
        }
    }
}