use std::collections::HashMap;
use std::time::SystemTime;

use crate::constants;
use crate::mass::Mass;
use crate::math::Vector;

#[derive(Serialize, Deserialize, Debug, Clone, Default)]
pub struct Navigation {
    pub range: f64,
    pub status: NavigationStatus,
    pub target_name: Option<String>,
    time: u64,
    start: Option<SystemTime>,
}

impl Navigation {
    pub fn new() -> Navigation {
        Navigation {
            target_name: None,
            range: constants::SHIP_NAVIGATION_RANGE,
            status: NavigationStatus::None,
            time: constants::SHIP_NAVIGATION_TIME,
            start: None,
        }
    }

    pub fn process(&mut self, ship_position: Vector, masses: &mut HashMap<String, Mass>) {
        self.verify_target(ship_position, masses);
        if let Some(timer) = self.start {
            if timer.elapsed().unwrap().as_secs() > self.time {
                self.status = NavigationStatus::Targeted;
                self.start = None;
            }
        }
    }

    pub fn give_received_data(&mut self, recv: String) {
        if !recv.is_empty() {
            self.start = Some(SystemTime::now());
            self.status = NavigationStatus::Targeting;
            self.target_name = Some(recv);
        }
    }

    pub fn get_client_data(&self, ship_position: Vector, masses: &HashMap<String, Mass>) -> String {
        let client_data = NavigationClientData {
            ship_position: ship_position.clone(),
            status: self.status.clone(),
            target_name: self.target_name.clone(),
            available_targets: masses
                .iter()
                .filter(|(_, mass)| ship_position.distance_from(mass.position.clone()) < self.range)
                .map(|(name, mass)| (name.to_string(), mass.position.clone()))
                .collect(),
        };

        serde_json::to_string(&client_data).unwrap() + "\n"
    }

    fn verify_target(&mut self, ship_position: Vector, masses: &HashMap<String, Mass>) {
        if let Some(name) = self.target_name.clone() {
            let target = masses.get(&name).unwrap();
            if target.position.distance_from(ship_position) > self.range {
                self.target_name = None;
                self.status = NavigationStatus::None;
            }
        }
    }
}

#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct NavigationClientData {
    pub ship_position: Vector,
    pub available_targets: Vec<(String, Vector)>,
    pub status: NavigationStatus,
    pub target_name: Option<String>,
}

#[derive(Serialize, Deserialize, Debug, Clone, PartialEq)]
pub enum NavigationStatus {
    None,
    Targeting,
    Targeted,
}

impl Default for NavigationStatus {
    fn default() -> Self {
        NavigationStatus::None
    }
}