extern crate tokio_postgres;
extern crate serde_json;
extern crate tokio;
use rayon::prelude::*;
use serde::ser::{Serialize, Serializer, SerializeStruct};
mod parser;
use std::fs::File;
use serde_json::json;

use tokio_postgres::types::ToSql;
//use futures::{TryStreamExt};
use tokio_postgres::{NoTls, Error};


impl Serialize for parser::QryData {
    fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        // 34 is the number of fields in the struct.
        let mut state = serializer.serialize_struct("parser::QryData", 34)?;
        state.serialize_field("time", &self.time)?;                                      
        state.serialize_field("ether_header.ether_dhost", &self.ether_header.ether_dhost)?;
        state.serialize_field("ether_header.ether_shost", &self.ether_header.ether_shost)?;
        state.serialize_field("ether_header.ether_type", &self.ether_header.ether_type)?;
        state.serialize_field("ipv4_header.ip_version", &self.ipv4_header.ip_version)?;
        state.serialize_field("ipv4_header.ip_ihl", &self.ipv4_header.ip_ihl)?;
        state.serialize_field("ipv4_header.ip_dscp", &self.ipv4_header.ip_dscp)?;
        state.serialize_field("ipv4_header.ip_ecn", &self.ipv4_header.ip_ecn)?;
        state.serialize_field("ipv4_header.ip_total_length", &self.ipv4_header.ip_total_length)?;
        state.serialize_field("ipv4_header.ip_identification", &self.ipv4_header.ip_identification)?;
        state.serialize_field("ipv4_header.ip_df", &self.ipv4_header.ip_df)?;
        state.serialize_field("ipv4_header.ip_mf", &self.ipv4_header.ip_mf)?;
        state.serialize_field("ipv4_header.ip_fragment_offset", &self.ipv4_header.ip_fragment_offset)?;
        state.serialize_field("ipv4_header.ip_source_address", &self.ipv4_header.ip_source_address)?;
        state.serialize_field("ipv4_header.ip_destination_address", &self.ipv4_header.ip_destination_address)?;
        state.serialize_field("ipv6_header.version", &self.ipv6_header.version)?;
        state.serialize_field("ipv6_header.traffic_class", &self.ipv6_header.traffic_class)?;
        state.serialize_field("ipv6_header.flow_label"          , &self.ipv6_header.flow_label)?;
        state.serialize_field("ipv6_header.payload_length"      , &self.ipv6_header.payload_length)?;
        state.serialize_field("ipv6_header.next_header"         , &self.ipv6_header.next_header)?;
        state.serialize_field("ipv6_header.hop_limit"           , &self.ipv6_header.hop_limit)?;
        state.serialize_field("ipv6_header.source_address"      , &self.ipv6_header.source_address)?;
        state.serialize_field("ipv6_header.destination_address" , &self.ipv6_header.destination_address)?;
        state.serialize_field("tcp_header.source_port", &self.tcp_header.source_port)?;
        state.serialize_field("tcp_header.destination_port", &self.tcp_header.destination_port)?;
        state.serialize_field("tcp_header.seq_num", &self.tcp_header.seq_num)?;
        state.serialize_field("tcp_header.ack_num", &self.tcp_header.ack_num)?;
        state.serialize_field("tcp_header.data_offset", &self.tcp_header.data_offset)?;
        state.serialize_field("tcp_header.reserved", &self.tcp_header.reserved)?;
        state.serialize_field("tcp_header.ns", &self.tcp_header.ns)?;
        state.serialize_field("tcp_header.cwr", &self.tcp_header.cwr)?;
        state.serialize_field("tcp_header.ece", &self.tcp_header.ece)?;
        state.serialize_field("tcp_header.urg", &self.tcp_header.urg)?;
        state.serialize_field("tcp_header.ack", &self.tcp_header.ack)?;
        state.serialize_field("tcp_header.psh", &self.tcp_header.psh)?;
        state.serialize_field("tcp_header.rst", &self.tcp_header.rst)?;
        state.serialize_field("tcp_header.syn", &self.tcp_header.syn)?;
        state.serialize_field("tcp_header.fin", &self.tcp_header.fin)?;
        state.serialize_field("tcp_header.window_size", &self.tcp_header.window_size)?;
        state.serialize_field("tcp_header.checksum", &self.tcp_header.checksum)?;
        state.serialize_field("tcp_header.urgent_pointer", &self.tcp_header.urgent_pointer)?;
        state.serialize_field("data", &self.data)?;
        state.end()
    }
}

fn serialize_packets ( v: Vec<parser::QryData> ) -> Vec<serde_json::Value> {
    let mut packets_serialized: Vec<_> = Vec::new();

   // for packet in v.iter() {
   //    // packets_serialized.push(json!(&packet)); 
   // }  
    
    /* rayon parallelized */
    packets_serialized = v.par_iter().map( |x| json!(x) ).collect();   

    packets_serialized
}

fn query_string ( insert_max: &usize ) -> String {
    let mut insert_template: String = "INSERT INTO json_dump (packet) Values ".to_owned();

    for insert in 0..insert_max-1 { insert_template.push_str( &(format!("(${}), ", insert+1)) );}
    insert_template.push_str( &(format!("(${})", insert_max)) );

    insert_template
}

#[tokio::main(core_threads = 4)] // By default, tokio_postgres uses the tokio crate as its runtime.
async fn main() -> Result<(), Error> {

    /* Init values from file */
    let file = File::open("parser.json").expect("file should open read only");
    
    let json: serde_json::Value = serde_json::from_reader(file).unwrap();
    let filter = json.get("filter").unwrap().as_str().unwrap();
    let insert_max = json.get("insert_max").unwrap().as_u64().unwrap() as usize; 
    let pcap_file = json.get("pcap_file").unwrap().as_str().unwrap();
    let host = ["host=", json.get("database_host").unwrap().as_str().unwrap()].join("");
    let user = ["user=", json.get("database_user").unwrap().as_str().unwrap()].join("");
    let password = ["password=", json.get("database_password").unwrap().as_str().unwrap()].join("");
    let connection = [host, user, password].join(" ");    
    let device = json.get("parse_device").unwrap().as_str().unwrap();
    let is_device = json.get("from_device").unwrap().as_bool().unwrap();
    

    /* db connection */
    let (client, connection) =
        tokio_postgres::connect(&connection, NoTls).await?;

    tokio::spawn(async move {
        if let Err(e) = connection.await {
            eprintln!("connection error: {}", e);
        }
    });

    client.execute("DROP TABLE IF EXISTS json_dump", &[]).await?;
    client.execute("CREATE TABLE json_dump ( ID serial NOT NULL PRIMARY KEY, packet json NOT NULL)", &[]).await?;

    /* device or file input */
    if false == is_device { 
    
    let v: Vec<parser::QryData> = parser::parse(&pcap_file, &filter ); 
    let packets_serialized = serialize_packets( v );     

    /* Query */ 
    //let insert_max =   60;
    let chunk_count = packets_serialized.len()/insert_max; 
    let remainder: usize = packets_serialized.len() % insert_max;
    let chunker = &packets_serialized.len() < &insert_max;
    match chunker {
        true =>     {  
                      let insert_str = query_string( &packets_serialized.len() );
                      let statement_false = client.prepare( &insert_str ).await?;
                      client.query_raw(&statement_false, packets_serialized.iter().map(|p| p as &dyn ToSql)).await?;
                    },           

        false =>    { 
                      
                      let insert_str = query_string( &insert_max );
                      let statement = client.prepare( &insert_str ).await?;
             
                      
                      for _i in 0..chunk_count {
                          let (_input, _)= packets_serialized.split_at(insert_max);
                          client.query_raw(&statement, _input.to_vec().iter().map(|p| p as &dyn ToSql)).await?;
                      }
                    
                      println!("Packets, total:{:?}",packets_serialized.len());
                      println!("Chunks, total:{}", chunk_count);  
                      println!("Chunks, remainder{}", remainder);  
                  
                      if remainder > 0 {
                          let rem_str = query_string( &remainder );
                          let statement_remainder = client.prepare(&rem_str).await?;
                          let (_garbage, _input) =packets_serialized.split_at(packets_serialized.len()-remainder);   
                          client.query_raw(&statement_remainder, _input.to_vec().iter().map(|p| p as &dyn ToSql),).await?; 
                      }

                    }
    }
    
    } else {
        let insert_str = query_string(&insert_max);
        let statement = client.prepare(&insert_str).await?;
        loop {
        let v: Vec<parser::QryData> = parser::parse_device(&device, &filter, &insert_max);
        let packets_serialized = serialize_packets( v );
        client.query_raw(&statement, packets_serialized.iter().map(|p| p as &dyn ToSql),).await?;
        }    
    }
    
    
    Ok(())
   
}

#[test]
fn test_insert_json () {
use serde_json::json;
 let mut client = Client::connect("host=localhost user=postgres password=password", NoTls).unwrap();
 let john = json!({
        "name": "John Doe",
        "age": 43,
        "phones": [
            "+44 1234567",
            "+44 2345678"
        ],
        "empty": []
    });

    client.execute("DROP TABLE IF EXISTS json_dump", &[]).unwrap();
    client.execute("CREATE TABLE json_dump ( ID serial NOT NULL PRIMARY KEY, data json NOT NULL)", &[]);
    client.query("INSERT INTO json_dump ( data ) VALUES ($1)", &[&john]);
}