extern crate serde_json;

use std::io::Write;
use std::io::BufRead;
use std::collections::HashMap;

use mass::{Mass, MassType};
use module::{ModuleType};
use module::NavigationStatus;
use server::connection::ServerConnection;

impl ServerConnection {
    pub fn server_engines(&mut self, masses : &mut HashMap<String, Mass>) -> bool {
        let masses_clone = masses.clone();

        let ship = masses.get_mut(&self.name).unwrap();
        let mut acceleration = (0.0, 0.0, 0.0);

        match ship.mass_type {
            MassType::Ship{ref modules, ..} => {
                match modules.get("Navigation").unwrap().module_type {
                    ModuleType::Navigation{ref status, ref target_name, ..} => {
                        let targeted = status == &NavigationStatus::Targeted;

                        let send = serde_json::to_string(&targeted).unwrap() + "\n";
                        match self.stream.write(send.as_bytes()) {
                            Ok(_result) => (),
                            Err(_error) => return false,
                        }

                        let mut recv = String::new();
                        match self.buff_r.read_line(&mut recv) {
                            Ok(result) => match recv.as_bytes() {
                                b"5\n" => acceleration.0 += 0.1,
                                b"0\n" => acceleration.0 -= 0.1,
                                b"8\n" => acceleration.1 += 0.1,
                                b"2\n" => acceleration.1 -= 0.1,
                                b"4\n" => acceleration.2 += 0.1,
                                b"6\n" => acceleration.2 -= 0.1,
                                b"+\n" => {
                                    let m_v = ship.velocity;
                                    acceleration = (m_v.0 * 0.05,
                                                    m_v.1 * 0.05,
                                                    m_v.2 * 0.05);
                                },
                                b"-\n" => {
                                    let m_v = ship.velocity;
                                    acceleration = (-1.0 * m_v.0 * 0.05,
                                                    -1.0 * m_v.1 * 0.05,
                                                    -1.0 * m_v.2 * 0.05);
                                },
                                b"c\n" => {
                                    match target_name {
                                        &Some(ref name) => {
                                            let target = masses_clone.get(name).unwrap();
                                            let d_v = target.velocity;
                                            let m_v = ship.velocity;
                                            acceleration = (d_v.0 - m_v.0,
                                                            d_v.1 - m_v.1,
                                                            d_v.2 - m_v.2);
                                        },
                                        &None => (),
                                    }
                                },
                                b"t\n" => {
                                    match target_name {
                                        &Some(ref name) => {
                                            let target = masses_clone.get(name).unwrap();
                                            let d_p = target.position;
                                            let m_p = ship.position;
                                            acceleration = ((d_p.0 - m_p.0) * 0.01,
                                                            (d_p.1 - m_p.1) * 0.01,
                                                            (d_p.2 - m_p.2) * 0.01);
                                        },
                                        &None => (),
                                    }
                                },
                                _ => {
                                    if result == 0 {
                                        return false
                                    }
                                },
                            },
                            Err(_error) => (),
                        }
                    },
                    _ => (),
                }
            },
            _ => (),
        }

        ship.accelerate(acceleration);

        true
    }
}