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use std::io::Write;
use std::path::PathBuf;
use std::fs::File;

use serde::{Deserialize, Serialize};
use config::{Config, FileFormat};
use anyhow::{Context, Result};
use lazy_static::lazy_static;
use console::Emoji;

#[derive(Debug, Default, Deserialize, PartialEq, Eq, Serialize)]
pub struct App {
  pub openai_api_key:    Option<String>,
  pub model:             Option<String>,
  pub max_tokens:        Option<usize>,
  pub max_commit_length: Option<usize>,
  pub timeout:           Option<usize>
}

impl App {
  #[allow(dead_code)]
  pub fn duration(&self) -> std::time::Duration {
    std::time::Duration::from_secs(self.timeout.unwrap_or(30) as u64)
  }
}

lazy_static! {
    pub static ref CONFIG_DIR: PathBuf = home::home_dir().unwrap().join(".config/git-ai");
    #[derive(Debug)]
    pub static ref APP: App = App::new().expect("Failed to load config");
    pub static ref CONFIG_PATH: PathBuf = CONFIG_DIR.join("config.ini");
}

impl App {
  pub fn new() -> Result<Self> {
    dotenv::dotenv().ok();

    if !CONFIG_DIR.exists() {
      std::fs::create_dir_all(CONFIG_DIR.to_str().unwrap()).context("Failed to create config directory")?;
      File::create(CONFIG_PATH.to_str().unwrap()).context("Failed to create config file")?;
    } else if !CONFIG_PATH.exists() {
      File::create(CONFIG_PATH.to_str().unwrap()).context("Failed to create config file")?;
    }

    let config = Config::builder()
      .add_source(config::Environment::with_prefix("APP").try_parsing(true))
      .add_source(config::File::new(CONFIG_PATH.to_str().unwrap(), FileFormat::Ini))
      .set_default("language", "en")?
      .set_default("timeout", 30)?
      .set_default("max-commit-length", 72)?
      .set_default("max-tokens", 2024)?
      .set_default("model", "gpt-4o")?
      .build()?;

    config
      .try_deserialize()
      .context("Failed to deserialize config")
  }

  pub fn save(&self) -> Result<()> {
    let contents = serde_ini::to_string(&self).context(format!("Failed to serialize config: {:?}", self))?;
    let mut file = File::create(CONFIG_PATH.to_str().unwrap()).context("Failed to create config file")?;
    file
      .write_all(contents.as_bytes())
      .context("Failed to write config file")
  }
}

pub fn run_model(value: String) -> Result<()> {
  let mut app = App::new()?;
  app.model = value.into();
  println!("{} Configuration option model updated!", Emoji("✨", ":-)"));
  app.save()
}

pub fn run_max_tokens(max_tokens: usize) -> Result<()> {
  let mut app = App::new()?;
  app.max_tokens = max_tokens.into();
  println!("{} Configuration option max-tokens updated!", Emoji("✨", ":-)"));
  app.save()
}

pub fn run_max_commit_length(max_commit_length: usize) -> Result<()> {
  let mut app = App::new()?;
  app.max_commit_length = max_commit_length.into();
  println!("{} Configuration option max-commit-length updated!", Emoji("✨", ":-)"));
  app.save()
}

pub fn run_openai_api_key(value: String) -> Result<()> {
  let mut app = App::new()?;
  app.openai_api_key = Some(value);
  println!("{} Configuration option openai-api-key updated!", Emoji("✨", ":-)"));
  app.save()
}