use schematic::Config;
use schematic::{ConfigLoader};
use clap::{Args, Parser};

/// CLI App
#[derive(Config, Debug)]
#[config(partial(derive(Args)))]
pub struct AppConfig {

    /// The Serial port to use
    #[setting(
        partial(arg(short, long)))
    ]
    pub port: String,

}

#[derive(Parser, Debug)]
struct Cli {
    // Note: PartialAppConfig is a struct generated by schematic that has all types wrapped in Option
    // The attributes wrapped in partial() are applied to this struct
    #[command(flatten)]
    app_config: PartialAppConfig,
}

impl AppConfig {
    
    pub fn readall() -> String {

        // Read from file
        let file_config = ConfigLoader::<AppConfig>::new()
	        .file("example-app.toml").unwrap()
	        .load().unwrap();

        let fileport = file_config.config.port;
        println!("file specified port: {}", fileport);

        // Read from command line
        let cli = Cli::parse();

        // Just panic's if the cli option isnt set
        // How do we read both at the same time?
        let cliport = cli.app_config.port.unwrap();
        println!("cli specified port: {}", cliport);

        fileport
    }
}

use clap::{CommandFactory, Parser, error::ErrorKind};
use figment::{Figment, providers::{Serialized, Toml, Format}};
use serde::{Serialize, Deserialize};

// https://github.com/SergioBenitez/Figment/issues/4

#[derive(Parser, Debug, Serialize, Deserialize)]
pub struct AppConfig {

    /// Port Number
    #[clap(short, long)]
    #[serde(skip_serializing_if = "::std::option::Option::is_none")]
    pub port: Option<String>,
}

impl AppConfig {
    pub fn readall() -> String {
        
        let config: AppConfig = Figment::new()
            .merge(Toml::file("example-app.toml"))
            .merge(Serialized::defaults(AppConfig::parse()))
            .extract().unwrap();

        // Custom Validation
        if config.port.is_none() {
            let mut cmd = AppConfig::command();
            cmd.error(
                ErrorKind::MissingRequiredArgument,
                "port not found",
            )
            .exit();
        }

        config.port.unwrap()
    }

}