use crate::app_config::AppConfig;
use crate::devices::device::{Device, DeviceId};
use std::collections::HashMap;

pub struct DevicesList(HashMap<DeviceId, Device>);

impl DevicesList {
    /// Load the list of devices. This method should be called only once during the whole execution
    /// of the program
    pub fn load() -> anyhow::Result<Self> {
        let mut list = Self(HashMap::new());

        for f in std::fs::read_dir(AppConfig::get().devices_config_path())? {
            let f = f?.file_name();
            let f = f.to_string_lossy();

            let dev_id = match f.strip_suffix(".conf") {
                Some(s) => DeviceId(s.to_string()),

                // This is not a device configuration file
                None => continue,
            };

            let device_conf = std::fs::read(AppConfig::get().device_config_path(&dev_id))?;

            list.0.insert(dev_id, serde_json::from_slice(&device_conf)?);
        }

        Ok(list)
    }

    /// Check if a device with a given id exists or not
    pub fn exists(&self, id: &DeviceId) -> bool {
        self.0.contains_key(id)
    }
}