use clap::{Parser, Subcommand};
use serde::{Deserialize, Serialize};
use std::{io::BufRead, path::PathBuf};
use teslatte::{
    auth::{AccessToken, RefreshToken},
    OwnerApi, VehicleApi,
};

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

mod config;
mod control;
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 {
        #[clap(long)]
        flash: bool,
    },
    /// 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 { flash } => match get_auth(auth_path).await {
            Ok(api) => {
                let products = api.products().await;
                println!("got products: {:#?}", products);
                if flash {
                    if let Ok(res) = products {
                        if let Some(teslatte::products::Product::Vehicle(vehicle)) = res.first() {
                            let _ = api.honk_horn(&vehicle.id).await;
                            match api.flash_lights(&vehicle.id).await {
                                Ok(_r) => println!("flashed"),
                                Err(e) => println!("error: {e:#?}"),
                            }
                        }
                    }
                }
                control::control_loop(api).await;
            }
            Err(e) => println!("{}", e.error_string()),
        },
    }
}

async fn get_auth(auth_path: PathBuf) -> Result<OwnerApi, AuthLoadError> {
    let key: AuthInfo = ron::from_str(&std::fs::read_to_string(&auth_path)?)?;
    let mut api = OwnerApi::new(key.access_token, key.refresh_token);
    api.refresh().await?;
    println!("Refreshed auth key");
    save_key(auth_path, &api)?;
    Ok(api)
}

#[derive(Serialize, Deserialize)]
struct AuthInfo {
    access_token: AccessToken,
    refresh_token: Option<RefreshToken>,
}

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

    let products = v.products().await;
    println!("got products: {:#?}", products);

    save_key(auth_path, &v)?;
    Ok(())
}

fn save_key(auth_path: PathBuf, api: &OwnerApi) -> Result<(), SaveError> {
    std::fs::write(
        auth_path,
        ron::ser::to_string(&AuthInfo {
            access_token: api.access_token.clone(),
            refresh_token: api.refresh_token.clone(),
        })?,
    )?;
    println!("Auth successfully saved");
    Ok(())
}