use clap::{Parser, Subcommand};
use std::{io::BufRead, path::PathBuf};
use teslatte::{auth::AccessToken, OwnerApi};

use crate::{config::Config, errors::*};

mod config;
mod errors;

#[derive(Parser, Debug, Clone)]
#[clap(author, version, about, long_about = None)]
struct Args {
    #[command(subcommand)]
    command: Commands,
    #[clap(long, default_value = "/etc/tesla-charge-controller")]
    config_dir: PathBuf,
}

#[derive(Subcommand, Debug, Clone)]
enum Commands {
    /// Run charge controller server
    Watch,
    /// Authenticate with Tesla login
    Auth,
    /// Print the default config file
    GenerateConfig,
}

fn press_y_to_continue() -> bool {
    println!("Continue? [y/N]");
    let mut line = String::new();
    let stdin = std::io::stdin();
    stdin.lock().read_line(&mut line).unwrap();
    if line.to_uppercase() == "Y\n" {
        true
    } else {
        println!("Exiting now!");
        false
    }
}

#[tokio::main]
async fn main() {
    let args = Args::parse();
    let auth_path = args.config_dir.join("auth");
    let config_path = args.config_dir.join("config");

    match args.command {
        Commands::GenerateConfig => {
            println!(
                "{}",
                ron::ser::to_string_pretty(&Config::default(), Default::default()).unwrap()
            );
        }
        Commands::Auth => {
            if auth_path.exists() {
                println!("Auth file already exists");
                if !press_y_to_continue() {
                    return;
                }
            }
            if let Err(e) = log_in(auth_path).await {
                println!("{}", e.error_string());
            }
        }
        Commands::Watch => match get_auth(auth_path) {
            Ok(api) => {
                println!("got products: {:#?}", api.products().await)
            }
            Err(e) => println!("{}", e.error_string()),
        },
    }
}

fn get_auth(auth_path: PathBuf) -> Result<OwnerApi, AuthLoadError> {
    let key: AccessToken = ron::from_str(&std::fs::read_to_string(auth_path)?)?;
    Ok(OwnerApi::new(key, None))
}

async fn log_in(auth_path: PathBuf) -> Result<(), LoginError> {
    let v = OwnerApi::from_interactive_url().await?;

    std::fs::write(auth_path, ron::ser::to_string(&v.access_token)?)?;
    println!("Auth successfully saved");
    Ok(())
}