// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: Unlicense

use anyhow::Result;
use detee_shared::general_proto::brain_general_cli_client::BrainGeneralCliClient;
use detee_shared::general_proto::AirdropReq;
use detee_shared::{app_proto, vm_proto};
use ed25519_dalek::{Signer, SigningKey};
use itertools::Itertools;
use rand::Rng;
use std::net::Ipv4Addr;
use std::sync::OnceLock;
use surreal_brain::constants::TOKEN_DECIMAL;
use tonic::metadata::AsciiMetadataValue;
use tonic::transport::Channel;
use tonic::Request;

pub static ADMIN_KEYS: OnceLock<Vec<Key>> = OnceLock::new();

pub fn admin_keys() -> Vec<Key> {
    let admin_keys = ADMIN_KEYS.get_or_init(|| {
        let admin_keys = vec![Key::new(), Key::new(), Key::new()];
        let admin_pub_keys = admin_keys.iter().map(|k| k.pubkey.clone()).join(", ");
        std::env::set_var("ADMIN_PUB_KEYS", admin_pub_keys);
        admin_keys.clone()
    });

    admin_keys.clone()
}

#[derive(Debug, Clone)]
pub struct Key {
    pub sg_key: SigningKey,
    pub pubkey: String,
}

impl Key {
    pub fn new() -> Self {
        let sk = SigningKey::generate(&mut rand::rngs::OsRng);
        let pubkey = bs58::encode(sk.verifying_key().to_bytes()).into_string();
        Key { sg_key: sk, pubkey }
    }

    pub fn from(private_key: &str) -> Self {
        let signing_key: SigningKey = bs58::decode(private_key)
            .into_vec()
            .expect("Failed to decode private key")
            .as_slice()
            .try_into()
            .expect("Failed to convert to SigningKey");
        let pubkey = bs58::encode(signing_key.verifying_key().to_bytes()).into_string();
        Key { sg_key: signing_key, pubkey }
    }

    pub fn sign_request<T: std::fmt::Debug>(&self, req: T) -> Result<Request<T>> {
        let pubkey = self.pubkey.clone();
        let timestamp = chrono::Utc::now().to_rfc3339();
        let signature = self.try_sign_message(&format!("{timestamp}{req:?}"))?;
        let timestamp: AsciiMetadataValue = timestamp.parse()?;
        let pubkey: AsciiMetadataValue = pubkey.parse()?;
        let signature: AsciiMetadataValue = signature.parse()?;
        let mut req = Request::new(req);
        req.metadata_mut().insert("timestamp", timestamp);
        req.metadata_mut().insert("pubkey", pubkey);
        req.metadata_mut().insert("request-signature", signature);

        Ok(req)
    }

    pub fn try_sign_message(&self, message: &str) -> Result<String> {
        let key = self.sg_key.clone();
        Ok(bs58::encode(key.sign(message.as_bytes()).to_bytes()).into_string())
    }

    pub fn sign_stream_auth_vm(
        &self,
        contracts: Vec<String>,
    ) -> Result<vm_proto::DaemonStreamAuth> {
        let pubkey = self.pubkey.clone();
        let timestamp = chrono::Utc::now().to_rfc3339();
        let signature =
            self.try_sign_message(&(timestamp.to_string() + &format!("{contracts:?}")))?;
        Ok(vm_proto::DaemonStreamAuth { timestamp, pubkey, contracts, signature })
    }

    pub fn sign_stream_auth_app(&self, contracts: Vec<String>) -> Result<app_proto::DaemonAuth> {
        let pubkey = self.pubkey.clone();
        let timestamp = chrono::Utc::now().to_rfc3339();
        let signature =
            self.try_sign_message(&(timestamp.to_string() + &format!("{contracts:?}")))?;
        Ok(app_proto::DaemonAuth { timestamp, pubkey, contracts, signature })
    }
}

pub async fn airdrop(brain_channel: &Channel, wallet: &str, amount: u64) -> Result<()> {
    let mut client = BrainGeneralCliClient::new(brain_channel.clone());
    let airdrop_req = AirdropReq { pubkey: wallet.to_string(), tokens: amount * TOKEN_DECIMAL };

    let admin_key = admin_keys()[0].clone();

    client.airdrop(admin_key.sign_request(airdrop_req.clone())?).await?;

    Ok(())
}

pub async fn get_ip_info(ip: &str) -> anyhow::Result<IPInfo> {
    let body = reqwest::get(format!("https://ipinfo.io/{ip}")).await?.text().await?;
    log::info!("Got the following data from ipinfo.io: {body}");
    Ok(serde_json::de::from_str(&body)?)
}

#[derive(serde::Deserialize, Clone, Debug)]
pub struct IPInfo {
    pub country: String,
    pub region: String,
    pub city: String,
    pub ip: String,
}

pub fn generate_random_public_ip() -> Ipv4Addr {
    let mut rng = rand::thread_rng();
    loop {
        let ip = Ipv4Addr::from(rng.gen::<u32>());
        if !ip.is_private()
            && !ip.is_loopback()
            && !ip.is_link_local()
            && !ip.is_broadcast()
            && !ip.is_documentation()
            && !ip.is_unspecified()
            && !ip.is_multicast()
            && ip.octets()[0] < 240
        {
            return ip;
        }
    }
}