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//! # query_external_ip
//!
//! Get the external IPv4 and IPv6 of the computer by querying online services.
//!
//! ## Example
//!
//! ```
//! use query_external_ip::Consensus;
//!
//! async fn get_ip() {
//!     match Consensus::get().await {
//!         Ok(c) => println!("{:#?}", c),
//!         Err(err) => println!("{}", err),
//!     }
//! }
//! ```
mod source;

use std::collections::HashMap;
use std::net::{IpAddr, Ipv4Addr, Ipv6Addr};

use crate::source::http::Http;
pub use crate::source::{Result, SourceError};

/// A consensus on what the external IPv4 and IPv6 is.
#[derive(Debug)]
pub struct Consensus {
    v4: Option<Ipv4Addr>,
    v6: Option<Ipv6Addr>,
}

impl Consensus {
    fn from_ips<T: IntoIterator<Item = IpAddr>>(ips: T) -> Self {
        let mut votes_v4 = HashMap::new();
        let mut votes_v6 = HashMap::new();
        for ip in ips {
            match ip {
                IpAddr::V4(ip) => votes_v4.entry(ip).and_modify(|c| *c += 1).or_insert(1),
                IpAddr::V6(ip) => votes_v6.entry(ip).and_modify(|c| *c += 1).or_insert(1),
            };
        }

        Self {
            v4: sort_votes(votes_v4),
            v6: sort_votes(votes_v6),
        }
    }

    pub async fn get() -> Result<Self> {
        let http_source = Http::new()?;
        let ips = http_source.get_ips().await;
        Ok(Self::from_ips(ips))
    }

    pub fn v4(&self) -> Option<Ipv4Addr> {
        self.v4
    }

    pub fn v6(&self) -> Option<Ipv6Addr> {
        self.v6
    }
}

fn sort_votes<U: Copy>(votes: HashMap<U, i32>) -> Option<U> {
    let mut ordered_votes: Vec<_> = votes.iter().collect();
    ordered_votes.sort_unstable_by(|(_, a), (_, b)| a.cmp(b));
    ordered_votes.pop().map(|(ip, _)| *ip)
}

#[cfg(test)]
mod tests {
    use crate::Consensus;
    use tokio_test::block_on;

    #[test]
    fn it_works() {
        async fn do_test() {
            match Consensus::get().await {
                Ok(c) => println!("{:#?}", c),
                Err(err) => println!("{}", err),
            }
        }
        block_on(do_test());
    }
}