use serde::Deserialize;

use crate::commands::{ClapArgs, Configurable, Executable};
use crate::config::{AppConfig, System};
use crate::container::Container;

use anyhow::Result;
use async_trait::async_trait;
use config::ConfigBuilder;
use config::builder::DefaultState;

#[derive(Debug, Deserialize, Clone)]
pub struct Config {
    pub system: System,
    pub input: String,
    pub dict_name: String,
}

#[derive(ClapArgs, Debug, Clone)]
pub struct EncodeCmd {
    #[arg(short, long, help = defaults::HELP_ENC_SYSTEM)]
    pub system: Option<String>,

    #[arg(short, long, help = defaults::HELP_ENC_DICT)]
    pub dict_name: Option<String>,

    #[arg(short, long, help = defaults::HELP_ENC_INPUT)]
    pub input: String,
}

impl Configurable for EncodeCmd {
    fn apply_defaults(
        &self,
        builder: ConfigBuilder<DefaultState>,
    ) -> Result<ConfigBuilder<DefaultState>> {
        builder
            .set_default("encode.system", defaults::ENC_SYSTEM_NAME)?
            .set_default("encode.dict_name", defaults::ENC_DICT_NAME)?
            .set_default("encode.input", "")
            .map_err(Into::into)
    }

    fn apply_overrides(
        &self,
        builder: ConfigBuilder<DefaultState>,
    ) -> Result<ConfigBuilder<DefaultState>> {
        let mut builder = builder;

        if let Some(system) = &self.system {
            builder = builder.set_override("encode.system", system.clone())?;
        }
        if let Some(dict_name) = &self.dict_name {
            builder = builder.set_override("encode.dict_name", dict_name.clone())?;
        }
        builder = builder.set_override("encode.input", self.input.clone())?;
        Ok(builder)
    }
}

#[async_trait]
impl Executable for EncodeCmd {
    async fn execute(&self, config: &AppConfig, container: &Container) -> Result<()> {
        let config = config
            .encode
            .as_ref()
            .ok_or_else(|| anyhow::anyhow!("Encoder config not set"))?;

        let encoder = container.create_encoder(&config).await?;
        let result = encoder.encode(&config.input);

        match result {
            Ok(res) => {
                let json = serde_json::to_string_pretty(&res).expect("JSON serialization failed");
                println!("{}", json);
            }
            Err(e) => eprintln!("Error encoding: {:?}", e),
        }

        Ok(())
    }
}

mod defaults {
    use const_format::formatcp;
    pub const ENC_SYSTEM_NAME: &str = "major_pl";
    pub const ENC_DICT_NAME: &str = "demo_pl";
    pub const HELP_ENC_SYSTEM: &str = formatcp!("System to use [default: {}]", ENC_SYSTEM_NAME);
    pub const HELP_ENC_INPUT: &str = formatcp!("Number to encode");
    pub const HELP_ENC_DICT: &str = formatcp!("Dictionary to use [default: {}]", ENC_DICT_NAME);
}