pub mod error;
mod storage;
mod p2p;
mod rpc;

use std::path::Path;
use crate::{utils::{emptiable::Emptiable, mergeable::Mergeable}};
pub use error::ConfigError;
use serde::{de::DeserializeOwned, Deserialize, Serialize};

use tokio::{fs::File, io::{AsyncReadExt, AsyncWriteExt}};
pub use storage::{StorageConfig, PartialStorageConfig};
pub use p2p::{P2pConfig, PartialP2pConfig};
pub use rpc::*;

#[cfg(feature="desktop")]
use clap::Args;

#[derive(Clone, Debug)]
pub struct Config {
    pub p2p: P2pConfig,
    pub storage: StorageConfig,
    pub rpc: RpcConfig,
}

#[cfg_attr(feature="desktop", derive(Args))]
#[derive(Clone, Debug, Default, Deserialize, PartialEq, Serialize)]
pub struct PartialConfig {
    #[cfg_attr(feature="desktop", command(flatten))]
    pub p2p: PartialP2pConfig,
    #[cfg_attr(feature="desktop", command(flatten))]
    pub storage: PartialStorageConfig,
    #[cfg_attr(feature="desktop", command(flatten))]
    pub rpc: PartialRpcConfig,
}

impl PartialConfig {
    pub fn new() -> Self {
        Self {
            p2p : PartialP2pConfig::empty().with_new_secret(),
            storage: PartialStorageConfig::empty(),
            rpc: PartialRpcConfig::empty(),
        }
    }
    pub fn from_toml(s: &str) -> Result<Self, toml::de::Error> {
        toml::from_str(s)
    }
    pub fn into_toml(&self) -> Result<String, toml::ser::Error> {
        toml::to_string(self)
    }
    pub async fn read_or_create<T>(path: T) -> Result<Self, ConfigError> 
    where
    T: AsRef<Path>
    {
        if !path.as_ref().exists() {
            Self::new().write_to(&path).await?;
        }
        Self::read_from(&path).await
    }
    pub async fn read_from<T>(path:T) -> Result<Self, ConfigError> 
    where 
    T: AsRef<Path>
    {
        let mut file = File::open(path.as_ref()).await?;
        let mut content = String::new();
        file.read_to_string(&mut content).await?;
        let config: Self = toml::from_str(&content)?;
        Ok(config)
    }
    pub async fn write_to<T>(&self, path:T) -> Result<(), ConfigError> 
    where 
    T: AsRef<Path>
    {
        if !path.as_ref().exists() {
            if let Some(x) = path.as_ref().parent() {
                std::fs::create_dir_all(x)?;
            };
            let _ = File::create(&path).await?;
        }
        let mut file = File::create(&path).await?;
        file.write_all(toml::to_string(self)?.as_bytes()).await?;
        Ok(())
    }
}

impl Emptiable for PartialConfig {
    fn empty() -> Self {
        Self {
            p2p: PartialP2pConfig::empty(), 
            storage: PartialStorageConfig::empty(),
            rpc: PartialRpcConfig::empty()
        }
    }

    fn is_empty(&self) -> bool {
        self.p2p.is_empty() && self.rpc.is_empty() && self.storage.is_empty()
    }
}


#[cfg(test)]
mod tests {
    use libp2p::identity;
    use super::*;
    use crate::{tests::test_toml_serialize_deserialize};
    
    #[tokio::test]
    async fn test_p2p_config_serialize_deserialize() {
        test_toml_serialize_deserialize(PartialConfig::empty());
    }
}