use serde_derive::{Deserialize, Serialize};
use reqwest::blocking::get;
use std::{fs, process::exit};
mod cloudflare;

#[derive(Serialize, Deserialize)]
struct DnsEntry {
    name: String,
    type4: bool,
    type6: bool,
    interface: Option<String>
}

#[derive(Serialize, Deserialize)]
struct DnsZone {
    email: String,
    name: String,
    id: String,
    dns_entries: Vec<DnsEntry>
}

#[derive(Serialize, Deserialize)]
struct DnsConfig {
    ipv6_interface: String,
    api_key: String,
    zones: Vec<DnsZone>
}

impl DnsConfig {
    fn new() -> DnsConfig {
        DnsConfig { 
            ipv6_interface: "".to_string(), 
            api_key: "".to_string(),
            zones: Vec::new() }
    }

    fn load(&mut self) {
        let file_contents = match fs::read_to_string("config.json") {
            Ok(data) => {data},
            Err(e) => panic!("{:#?}", e)
        };
        let config_parse: DnsConfig =  match serde_json::from_str(&file_contents) {
            Ok(data) => {data},
            Err(e) => panic!("{:#?}", e)
        };
        *self = config_parse;
    }
}

struct Ips {
    ipv4: String,
    ipv6base: String
}

impl Ips {
    fn new() -> Ips {
        Ips { 
            ipv4: "0.0.0.0".to_string(), 
            ipv6base: ":".to_string() 
        }
    }

    fn get(&mut self, ipv6_interface: &str) {
        let ipv4uri = "https://am.i.mullvad.net/ip";
        let ipv6uri = "https://ipv6.am.i.mullvad.net/ip";

        let response = get(ipv4uri);
        
        match response {
            Ok(data) => self.ipv4 = data.text().expect("0.0.0.0").trim_end().to_owned(),
            Err(e) => {
                println!("Could not fetch IP4, quitting");
                exit(75);
            }
        }

        let response = get(ipv6uri);

        match response {
            Ok(data) => {
                let ipv6 = data.text().expect(":");
                let stripped = match ipv6.strip_suffix(ipv6_interface) {
                    Some(string) => {string.to_string()},
                    None => {":".to_string()}
                };
                self.ipv6base = stripped;
            },
            Err(e) => {
                println!("Could not fetch IP6, quitting");
                exit(75);
            }
        }
    }
}

fn main() {

    let mut config = DnsConfig::new();
    config.load();

    let mut ips = Ips::new();
    ips.get(&config.ipv6_interface);

    let mut created4: u16 = 0;
    let mut updated4: u16 = 0;
    let mut unchanged4: u16 = 0;
    let mut error4: u16 = 0;

    let mut created6: u16 = 0;
    let mut updated6: u16 = 0;
    let mut unchanged6: u16 = 0;
    let mut error6: u16 = 0;

    for zone in config.zones {
        let mut agent = cloudflare::Instance::new(&config.api_key);

        agent.load_entries(&zone.email, &zone.id);


        for entry in zone.dns_entries {
            let mut found4 = false;
            let mut found6 = false;

            for cloudflare_entry in &agent.dns_entries {

                if cloudflare_entry.is_equal(&entry.name) {
                    if cloudflare_entry.r#type == cloudflare::CloudflareDnsType::A && entry.type4 {
                        found4 = true;
                        if cloudflare_entry.is_ip_new(&ips.ipv4) {
                            let success = agent.update_entry(cloudflare_entry, &ips.ipv4);
                            if success { updated4 += 1 } else { error4 += 1 }
                        }
                        else {
                            unchanged4 += 1;
                        }
                    }

                    if cloudflare_entry.r#type == cloudflare::CloudflareDnsType::AAAA && entry.type6 {
                        found6 = true;
                        let ipv6 = ips.ipv6base.clone() + entry.interface.as_ref().unwrap();

                        if cloudflare_entry.is_ip_new(&ipv6) {
                            let success = agent.update_entry(cloudflare_entry, &ipv6);
                            if success { updated6 += 1 } else { error6 += 1 }
                        }
                        else {
                            unchanged6 += 1;
                        }
                    }

                }

                //println!("{:#?}", entry.subdomain); // DEBUG
            }

            if !found4 && entry.type4 {
                let success = agent.create_entry(&zone.id, "A", &entry.name, &ips.ipv4);
                if success { created4 += 1 };
            }

            if !found6 && entry.type6 {
                let ipv6 = ips.ipv6base.clone() + entry.interface.as_ref().unwrap();
                let success = agent.create_entry(&zone.id, "AAAA", &entry.name, &ipv6);
                if success { created6 += 1 };
            }
        }
        
        //println!("{:#?}", zone.domain); // DEBUG
    }
    println!("++++A Records+++");
    println!("{} created", created4);
    println!("{} updated", updated4);
    println!("{} unchanged", unchanged4);
    println!("{} errors", error4);
    println!("++AAAA Records++");
    println!("{} created", created6);
    println!("{} updated", updated6);
    println!("{} unchanged", unchanged6);
    println!("{} errors", error6);
    
}