pub mod decode;
pub mod encode;
pub mod import_dict;

use crate::config::AppConfig;
use crate::container::Container;
use anyhow::Result;
use async_trait::async_trait;
use clap::Subcommand;
use clap::{Args as ClapArgs, Parser};
use config::ConfigBuilder;
use config::builder::DefaultState;
use std::path::PathBuf;

#[derive(Subcommand, Debug, Clone)]
pub enum Command {
    /// Decode a word using given system
    Decode(decode::DecodeArgs),

    /// Encode a number using given system
    Encode(encode::EncodeArgs),

    /// Import dictionary
    ImportDict(import_dict::ImportDictArgs),
}

pub fn resolve_command(command: &Command) -> &dyn AppCommand {
    match command {
        Command::Decode(args) => args,
        Command::Encode(args) => args,
        Command::ImportDict(args) => args,
    }
}

#[derive(Parser, Debug)]
#[command(author, version, about)]
pub struct CliArgs {
    #[command(flatten)]
    pub global: GlobalArgs,

    #[command(subcommand)]
    pub command: Command,
}

#[derive(ClapArgs, Debug)]
pub struct GlobalArgs {
    /// Path to config file
    #[arg(short, long, default_value = "config.toml")]
    pub config: PathBuf,

    #[arg(long, help = defaults::HELP_LOG)]
    pub log_level: Option<String>,
}

pub trait ConfigurableCommand {
    fn apply_defaults(
        &self,
        builder: ConfigBuilder<DefaultState>,
    ) -> Result<ConfigBuilder<DefaultState>>;
    fn apply_overrides(
        &self,
        builder: ConfigBuilder<DefaultState>,
    ) -> Result<ConfigBuilder<DefaultState>>;
}

#[async_trait]
pub trait CommandExecutor {
    async fn execute(&self, config: &AppConfig, container: &Container) -> Result<()>;
}

// AppCommand must be dyn-compatible. ConfigurableCommand is already dyn-compatible.
// CommandExecutor is dyn-compatible because of #[async_trait].
pub trait AppCommand: ConfigurableCommand + CommandExecutor {}

impl<T: ConfigurableCommand + CommandExecutor> AppCommand for T {}

mod defaults {
    use const_format::formatcp;

    pub const LOG_LEVEL: &str = "info";
    pub const HELP_LOG: &str = formatcp!("Override Log Level [default: {}]", LOG_LEVEL);
}