use std::net::{Ipv4Addr, Ipv6Addr};

use anyhow::{anyhow, Result};
use async_trait::async_trait;
use reqwest::header;
use serde::Serialize;
use tracing::{info, warn};

use crate::provider::DnsProvider;
use crate::Opt;

pub struct GandiProvider {
    client: reqwest::Client,
}

impl GandiProvider {
    pub fn new(opts: &Opt) -> Result<Self> {
        let api_key = opts
            .gandi_api_key
            .clone()
            .ok_or_else(|| anyhow!("Must specify D53_GANDI_API_KEY"))?;

        let mut headers = header::HeaderMap::new();
        let mut auth_value = header::HeaderValue::from_str(&format!("Apikey {}", api_key))?;
        auth_value.set_sensitive(true);
        headers.insert(header::AUTHORIZATION, auth_value);

        let client = reqwest::Client::builder()
            .default_headers(headers)
            .use_rustls_tls()
            .build()?;

        Ok(Self { client })
    }

    async fn put_rrset(&self, url: &str, rrset: &GandiRrset) -> Result<()> {
        info!("PUT {} with {:?}", url, rrset);
        let http = self.client.put(url).json(rrset).send().await?;

        if !http.status().is_success() {
            warn!("PUT {} returned {}", url, http.status());
        }

        http.error_for_status()?;
        Ok(())
    }
}

#[async_trait]
impl DnsProvider for GandiProvider {
    fn provider(&self) -> &'static str {
        "gandi"
    }

    async fn update_a(&self, domain: &str, subdomain: &str, targets: &[Ipv4Addr]) -> Result<()> {
        let url = format!(
            "https://api.gandi.net/v5/livedns/domains/{}/records/{}/A",
            domain, subdomain
        );

        let rrset = GandiRrset {
            rrset_values: targets.iter().map(ToString::to_string).collect::<Vec<_>>(),
            rrset_ttl: 300,
        };

        self.put_rrset(&url, &rrset).await
    }

    async fn update_aaaa(&self, domain: &str, subdomain: &str, targets: &[Ipv6Addr]) -> Result<()> {
        let url = format!(
            "https://api.gandi.net/v5/livedns/domains/{}/records/{}/AAAA",
            domain, subdomain
        );

        let rrset = GandiRrset {
            rrset_values: targets.iter().map(ToString::to_string).collect::<Vec<_>>(),
            rrset_ttl: 300,
        };

        self.put_rrset(&url, &rrset).await
    }

    async fn update_cname(&self, domain: &str, subdomain: &str, target: &str) -> Result<()> {
        let url = format!(
            "https://api.gandi.net/v5/livedns/domains/{}/records/{}/CNAME",
            domain, subdomain
        );

        let rrset = GandiRrset {
            rrset_values: vec![target.to_string()],
            rrset_ttl: 300,
        };

        self.put_rrset(&url, &rrset).await
    }
}

#[derive(Serialize, Debug)]
struct GandiRrset {
    rrset_values: Vec<String>,
    rrset_ttl: u32,
}