use anyhow::Result;
use ed25519_dalek::SigningKey;
use log::{info, warn};
use sha2::{Digest, Sha256};
use std::fs::File;
use std::io::{Read, Write};
use std::sync::LazyLock;

pub const DETEE_ROOT_CA: &str = "/etc/detee/root_ca.pem";
pub const BRAIN_STAGING: (&str, &str) = ("https://159.65.58.38:31337", "staging-brain");
pub const BRAIN_TESTING: (&str, &str) = ("https://164.92.249.180:31337", "testnet-brain");
pub const PACKAGE_ARCHIVE_POSTFIX: &str = "-enclave_package.tar.gz";
pub const PACKAGE_ARCHIVE_DIR_PATH: &str = "./enclave_archives";
pub const PACKAGE_DIR_PATH: &str = "./enclaves";

pub const APP_NAME_PREFIX: &str = "dtpm";

// const DETEE_DIR_ENV_NAME: &str = "DETEE_DIR";

pub static IP_INFO: LazyLock<IPInfo> =
    LazyLock::new(|| tokio::task::block_in_place(|| get_ip_info().unwrap()));

pub static DAEMON_CONFIG_BASE_DIR: LazyLock<String> =
    LazyLock::new(|| "/etc/detee/app_daemon".to_string());

pub static USED_RESOURCES_PATH: LazyLock<String> = LazyLock::new(|| {
    // let home = home::home_dir().unwrap().to_string_lossy().into_owned();
    // std::env::var(DETEE_DIR_ENV_NAME)
    //     .unwrap_or(format!("{home}/.detee/app_daemon/used_resources.yaml"))
    let base_dir = DAEMON_CONFIG_BASE_DIR.to_string();
    format!("{base_dir}/used_resources.yaml")
});

pub static DAEMON_CONFIG_PATH: LazyLock<String> = LazyLock::new(|| {
    // let home = home::home_dir().unwrap().to_string_lossy().into_owned();
    // std::env::var(DETEE_DIR_ENV_NAME).unwrap_or(format!("{home}/.detee/app_daemon/config.yaml"))
    let base_dir = DAEMON_CONFIG_BASE_DIR.to_string();
    format!("{base_dir}/config.yaml")
});

pub static DEPLOYED_APPS_CONFIG_DIR: LazyLock<String> = LazyLock::new(|| {
    // let home = home::home_dir().unwrap().to_string_lossy().into_owned();
    // std::env::var(DETEE_DIR_ENV_NAME).unwrap_or(format!("{home}/.detee/app_daemon/deployed_apps/"))
    let base_dir = DAEMON_CONFIG_BASE_DIR.to_string();
    format!("{base_dir}/deployed_apps")
});

pub static SECRET_KEY_PATH: LazyLock<String> = LazyLock::new(|| {
    // let home = home::home_dir().unwrap().to_string_lossy().into_owned();
    // std::env::var(DETEE_DIR_ENV_NAME)
    //     .unwrap_or(format!("{home}/.detee/app_daemon/node_secret_key.pem"))
    let base_dir = DAEMON_CONFIG_BASE_DIR.to_string();
    format!("{base_dir}/node_secret_key.pem")
});

pub static PUBLIC_KEY: LazyLock<String> = LazyLock::new(get_public_key);

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

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

fn create_secret_key() -> Result<SigningKey> {
    let key_path = SECRET_KEY_PATH.to_string();
    info!("Creating new secret key at {}", key_path);
    let sk = SigningKey::generate(&mut rand::rngs::OsRng);
    let private_key_string = bs58::encode(sk.to_bytes()).into_string();
    let mut file = File::create(key_path)?;
    file.write_all(private_key_string.as_bytes())?;
    Ok(sk)
}

fn load_secret_key() -> Result<ed25519_dalek::SigningKey> {
    let secret_key_string = match std::fs::read_to_string(SECRET_KEY_PATH.to_string()) {
        Ok(secret_key_pem) => secret_key_pem,
        Err(e) => {
            warn!("Could not load secret key due to error: {e:?}");
            return create_secret_key();
        }
    };
    Ok(SigningKey::from_bytes(
        &bs58::decode(secret_key_string)
            .into_vec()?
            .try_into()
            .map_err(|_| bs58::decode::Error::BufferTooSmall)?,
    ))
}

pub fn sign_message(msg: &str) -> Result<String> {
    use ed25519_dalek::Signer;
    let key = load_secret_key()?;
    Ok(bs58::encode(key.sign(msg.as_bytes()).to_bytes()).into_string())
}

pub fn get_public_key() -> String {
    let pubkey = bs58::encode(load_secret_key().unwrap().verifying_key().to_bytes()).into_string();
    log::info!("Loaded the following public key: {pubkey}");
    pubkey
}

pub fn compute_sha256<P: AsRef<std::path::Path>>(path: P) -> Result<String> {
    let mut file = File::open(path)?;
    let mut hasher = Sha256::new();
    let mut buffer = [0u8; 8192];
    loop {
        let bytes_read = file.read(&mut buffer).unwrap();
        if bytes_read == 0 {
            break;
        }
        hasher.update(&buffer[..bytes_read]);
    }
    let result = hasher.finalize();
    Ok(format!("{:x}", result))
}