use std::error::Error;

use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
pub struct Config {
    python_path: String,
    model_name: String,
    temperature: String,
    top_k: String,
    gpt_code_path: String,
    fediverse_base_url: String,
}

impl Config {
    pub fn default() -> Config {
        Config {
            python_path: String::from("/usr/bin/python3"),
            model_name: String::from("117M"),
            temperature: String::from("1"),
            top_k: String::from("40"),
            gpt_code_path: String::from("."),
            fediverse_base_url: String::from("https://lain.com"),
        }
    }

    pub fn from(path: String) -> Result<Config, Box<dyn Error>> {
        let file_bytes = std::fs::read(path)?;
        match serde_json::from_slice(&file_bytes) {
            Ok(res) => Ok(res),
            Err(err) => Err(Box::new(err)),
        }
    }

    pub fn save(&self, path: String) -> Option<Box<dyn Error>> {
        let cfg_json = match serde_json::to_vec(self) {
            Ok(res) => res,
            Err(err) => return Some(Box::new(err)),
        };

        match std::fs::write(path, &cfg_json) {
            Ok(_) => None,
            Err(err) => Some(Box::new(err)),
        }
    }

    /// Get a reference to the config's python path.
    pub fn python_path(&self) -> String {
        self.python_path.clone()
    }

    /// Get a reference to the config's model name.
    pub fn model_name(&self) -> String {
        self.model_name.clone()
    }

    /// Get a reference to the config's temperature.
    pub fn temperature(&self) -> String {
        self.temperature.clone()
    }

    /// Get a reference to the config's top k.
    pub fn top_k(&self) -> String {
        self.top_k.clone()
    }

    /// Get a reference to the config's gpt code path.
    pub fn gpt_code_path(&self) -> String {
        self.gpt_code_path.clone()
    }

    pub fn fediverse_base_url(&self) -> String {
        self.fediverse_base_url.clone()
    }
}