library_blockchain/

transaction.rs

use serde::{Serialize};
use super::*;
use std::{collections::HashSet};

extern crate serde;

/// The field of to_addr is the name of a account for example Lucy
/// </br></br>
/// The field of to_amount is the value of a account for 10000. Do not write 10_000 because of deserialized mechanism used in the program.
#[derive( Debug,Clone, serde::Serialize)]
pub struct Amount  {
    pub to_addr:  Address,
    pub amount:   u64,
}



/// Trx contain 2 pieces of info: Set of I/O that I=O - Value of TRXs=Sum(Inputs) Value of the Fee =Sum(Inputs)-Sum(Outputs)
/// </br></br>
/// We implement coinbase TRXs model: do not require inputs, produce an output - allow the miner to collect all the trx fees in that block and that block's block reward (coin genesis)

#[derive(Debug,Clone,Serialize)]
pub struct Transaction  {
    pub inputs: Vec<Amount>,
    pub outputs: Vec<Amount>,
}

/// Consume for IO hash,value clousures
pub enum IO {
    Input,
    Output,
}

/// Parent trait is for expanding transaction component in the future.
pub trait SuperTransaction {}

/// Consume SuperTransaction(Child)
pub trait Put
where
    Self: SuperTransaction,
{
    fn returns_closure_io(&self, io: &IO) -> Box<(dyn Fn() -> u64 + '_)>;
    fn returns_closure_io_hash(&self, io: &IO) -> Box<(dyn Fn() -> HashSet<Hash> + '_)>;
}

impl  SuperTransaction for Transaction  {}

impl  Put for Transaction  {
    fn returns_closure_io(&self, io: &IO) -> Box<(dyn Fn() -> u64 + '_)> {
        match io {
            IO::Input => Box::new(|| self.inputs.iter().map(|input| input.amount).sum()),
            IO::Output => Box::new(|| self.outputs.iter().map(|output| output.amount).sum()),
        }
    }

    fn returns_closure_io_hash(&self, io: &IO) -> Box<(dyn Fn() -> HashSet<Hash> + '_)> {
        match io {
            IO::Input => Box::new(|| {
                self.inputs
                    .iter()
                    .map(|input| input.hash())
                    .collect::<HashSet<Hash>>()
            }),
            IO::Output => Box::new(|| {
                self.outputs
                    .iter()
                    .map(|output| output.hash())
                    .collect::<HashSet<Hash>>()
            }),
        }
    }
}

impl  Transaction  {
    pub fn default() -> Transaction {
        Self::new(vec![

        ], vec![
            // transaction::Value {
            //     to_addr: "Alice".to_owned(),
            //     value: 47,
            // },
            // transaction::Value {
            //     to_addr: "Bob".to_owned(),
            //     value: 3
            // },
       ])
    }
    pub fn new(inputs: Vec<Amount >, outputs: Vec<Amount >) -> Transaction  {
        Self {
            inputs: inputs,
            outputs: outputs,
        }
    }

    //    pub fn trx_data<F>(&mut self, mut f: F) // We bring in self, but only f is generic F. f is the closure
    //     where
    //         F: FnMut(&mut Vec<Value>, &mut Vec<Value>), // The closure takes mutable vectors of u32
    //                                                 // which are the year and population data
    //     {
    //         f(&mut self.inputs, &mut self.outputs) // Finally this is the actual function. It says
    //                                                   // "use a closure on self.years and self.populations"
    //                                                   // We can do whatever we want with the closure
    //     }

    pub fn is_coinbase(&self) -> bool {
        (&self.inputs).len() as u8 == 0
    }
}

impl  Hashable for Amount  {
    fn bytes(&self) -> Vec<u8> {
        let mut bytes = vec![];

        bytes.extend(self.to_addr.as_bytes());
        bytes.extend(&lib_block_u64_bytes(&self.amount));

        bytes
    }
}

impl  Hashable for Transaction  {
    fn bytes(&self) -> Vec<u8> {
        let mut bytes = vec![];

        bytes.extend(
            self.inputs
                .iter()
                .flat_map(|input| input.bytes())
                .collect::<Vec<u8>>(),
        );

        bytes.extend(
            self.outputs
                .iter()
                .flat_map(|output| output.bytes())
                .collect::<Vec<u8>>(),
        );

        bytes
    }
}



// macro_rules! call_on_self {
//     ($receiver:ident, $F:ident) => {
//         $receiver.$F()
//     };
// }
// fn return_closure_hash_data(in_or_out: &str)-> impl Fn(&Vec<Output>)-> HashSet<Hash>
//      {
//          |ref inputs| {
//                     inputs
//                     .iter()
//                     .map(|input| input.hash())
//                     .collect::<HashSet<Hash>>()
//     }
// }
// impl PartialEq<Value> for Value {
//     fn eq(&self, other: &Value) -> bool {
//         self.to_addr== other.to_addr && self.value== other.value
//     }
// }

// impl  Deref for Transaction  {
//     type Target =  Vec<u8> ;
//     fn deref(&self) -> &Self::Target {          
//         let mut trx_bytes:Vec<u8>= vec![];
//         trx_bytes.extend(&self.inputs.iter()
//                 .flat_map(|input| input.bytes())
//                 .collect::<Vec<u8>>());
//         trx_bytes.extend(&self.outputs.iter()
//                 .flat_map(|output| output.bytes())
//                 .collect::<Vec<u8>>());
//         &trx_bytes.clone()
        
//     }
// }
// trait TraitOptionTransaction{}
// impl TraitOptionTransaction for OptionTransaction<'_>{}

//#[derive(Serialize, Deserialize)]
//#[serde(remote = "OptionTransaction")]

//#[derive(Serialize, Deserialize)]
// pub struct OptionTransaction {
//     pub puts:  Option<  Transaction>
// }
// impl  OptionTransaction {
//     pub fn new(inputs: Vec<Amount>, outputs: Vec<Amount>) ->  Self {

//         Some(Self {
//              inputs,
//              outputs,
//          })
//      }
// pub fn new(&self) -> OptionTransaction  {
//     let puts = self.puts;
//     OptionTransaction { puts, }
// }
//}

// impl  std::ops::DerefMut for OptionTransaction  {
//     fn deref_mut(&mut self) -> &mut Self::Target {
//         mut self.puts
//     }
// }
// impl  Default for OptionTransaction {

//     fn default () -> Self {
//         OptionTransaction {
//             puts: &None
//         }
//     }
// }