extern crate serde_json;
extern crate tokio;
extern crate tokio_postgres;
use std::fs::File;
mod parser;
mod serializer;
use std::fs;
use std::io::prelude::*;
use std::collections::HashMap;
use tokio_postgres::types::ToSql;
use tokio_postgres::{Error, NoTls};

const PCAPNG_SIGNATURE: [u8;4] = [0x0a, 0x0d, 0x0d, 0x0a];
const PCAP_SIGNATURE:  [u8;4] = [0xed, 0xab, 0xee, 0xdb];

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();
    let pcap_dir = json.get("pcap_dir").unwrap().as_str().unwrap();

    let mut pcap_map = HashMap::new();
    if let Ok(entries) = fs::read_dir(pcap_dir) {
        for entry in entries {
            if let Ok(entry) = entry {
                if let Ok(_file_type) = entry.file_type() {
                    if entry.metadata().unwrap().is_file() { 
                        let mut magic_number: [u8;4] = [0;4];  
                        let _signature = File::open(entry.path().to_owned()).unwrap().read_exact(&mut magic_number).unwrap();
                        match magic_number {
                            PCAPNG_SIGNATURE => pcap_map.insert(entry.path(), entry.metadata()),
                            PCAP_SIGNATURE => pcap_map.insert(entry.path(), entry.metadata()),
                            _ => None 
                            
                        };
                       // println!("{:?}", &entry.metadata().unwrap().modified());
                        
                     }
            } else {
        println!("Couldn't get file type for {:?}", entry.path());
                }
            }
        }
    }
    println!("{:?}", pcap_map.iter());
    /* 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 = serializer::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 = serializer::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]);
}