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use crate::update_manifest::UpdateManifest;
use serde_derive::{Deserialize, Serialize};
use solana_sdk::pubkey::Pubkey;
use std::fs::{create_dir_all, File};
use std::io::{self, Write};
use std::path::{Path, PathBuf};

#[derive(Serialize, Deserialize, Debug, PartialEq)]
pub enum ExplicitRelease {
    Semver(String),
    Channel(String),
}

#[derive(Serialize, Deserialize, Default, Debug, PartialEq)]
pub struct Config {
    pub json_rpc_url: String,
    pub update_manifest_pubkey: Pubkey,
    pub current_update_manifest: Option<UpdateManifest>,
    pub update_poll_secs: u64,
    pub explicit_release: Option<ExplicitRelease>,
    pub releases_dir: PathBuf,
    active_release_dir: PathBuf,
}

impl Config {
    pub fn new(
        data_dir: &str,
        json_rpc_url: &str,
        update_manifest_pubkey: &Pubkey,
        explicit_release: Option<ExplicitRelease>,
    ) -> Self {
        Self {
            json_rpc_url: json_rpc_url.to_string(),
            update_manifest_pubkey: *update_manifest_pubkey,
            current_update_manifest: None,
            update_poll_secs: 60 * 60, // check for updates once an hour
            explicit_release,
            releases_dir: PathBuf::from(data_dir).join("releases"),
            active_release_dir: PathBuf::from(data_dir).join("active_release"),
        }
    }

    fn _load(config_file: &str) -> Result<Self, io::Error> {
        let file = File::open(config_file.to_string())?;
        let config = serde_yaml::from_reader(file)
            .map_err(|err| io::Error::new(io::ErrorKind::Other, format!("{:?}", err)))?;
        Ok(config)
    }

    pub fn load(config_file: &str) -> Result<Self, String> {
        Self::_load(config_file).map_err(|err| format!("Unable to load {}: {:?}", config_file, err))
    }

    fn _save(&self, config_file: &str) -> Result<(), io::Error> {
        let serialized = serde_yaml::to_string(self)
            .map_err(|err| io::Error::new(io::ErrorKind::Other, format!("{:?}", err)))?;

        if let Some(outdir) = Path::new(&config_file).parent() {
            create_dir_all(outdir)?;
        }
        let mut file = File::create(config_file)?;
        file.write_all(&serialized.into_bytes())?;

        Ok(())
    }

    pub fn save(&self, config_file: &str) -> Result<(), String> {
        self._save(config_file)
            .map_err(|err| format!("Unable to save {}: {:?}", config_file, err))
    }

    pub fn active_release_dir(&self) -> &PathBuf {
        &self.active_release_dir
    }

    pub fn active_release_bin_dir(&self) -> PathBuf {
        self.active_release_dir.join("bin")
    }

    pub fn release_dir(&self, release_id: &str) -> PathBuf {
        self.releases_dir.join(release_id)
    }
}