use chrono::{DateTime, Utc};
use crate::location::FLocation;
use ratatui::{style::Color, text::Line, widgets::{ListItem, ListState}};

#[derive(Clone,Debug)]
pub enum CurrentScreen {
    Map,
    CityChoice,
    Exiting
}


#[derive(Debug,Clone,PartialEq)]
pub struct City {
    pub name: String,
    pub long: f32,
    pub lat: f32,
}

impl From<&City> for ListItem<'_> {
    fn from(value: &City) -> Self {
        let line = Line::styled(
            format!("{} :  {} W/E , {} N/S",value.name,value.long,value.lat), 
        Color::Gray);
        ListItem::new(line)
    }
    
}

/// uuuhhh future feature.
/// checking if the currently chosen city is within the ISS's visibility (https://tangled.sh/@technoduck.me/iss_locator.rs)
pub const CITIES:[(&str,f32,f32);9] = [
    ("Montreal",-72.2,45.5),
    ("Tokyo",139.766,35.66),
    ("Delhi",77.216,28.6),
    ("Shanghai",121.45,31.22),
    ("São Paulo",-46.65,-23.55),
    ("Mexico City",-99.12,19.45),
    ("Cairo",31.233,30.03),
    ("New York",-74.0,40.7),
    ("London",0.03,51.55)
];

impl From<&(&str,f32,f32)> for City {
    fn from(value: &(&str,f32,f32)) -> Self {
        City { name: value.0.to_string(), long: value.1, lat: value.2 }
    }
}

#[derive(Clone,Debug)]
pub struct CityList {
    pub cities: Vec<City>,
    pub state: ListState
}




#[derive(Clone,Debug)]
pub struct App {
    pub current_screen: CurrentScreen,
    pub cities: CityList,
    pub iss_location: Option<FLocation>,
    pub getting_location: bool,
    pub iss_constant: Option<sgp4::Constants>,
    pub iss_constant_epoch: Option<DateTime<Utc>>
}


impl App {
    pub fn new() -> App {

        let cities_vec:Vec<City> = CITIES.iter()
            .map(|f| City::from(f))
            .collect();
        let cities:CityList = CityList { cities: cities_vec, state: ListState::default() };

        App {
            current_screen:CurrentScreen::Map,
            cities,
            iss_location: None,
            getting_location: false,
            iss_constant: None,
            iss_constant_epoch: None
        }
    }

}