use std::{
    env::current_dir,
    fs::{File, create_dir_all},
    io::Write,
};

use color_eyre::eyre::{Context, Result};
use fil_core::{Group, Kasten, Priority, Task, Zettel};
use tower_lsp::{LspService, Server};

use crate::{
    cli::{Commands, ZettelSubcommand},
    config::{Config, get_config_dir},
    lsp::Backend,
};

impl Commands {
    pub async fn process(self) -> Result<()> {
        match self {
            Self::Init { name } => {
                let dir = current_dir()
                    .context("Failed to get current directory")?
                    .join(&name);

                Kasten::initialize(dir.clone()).await?;

                // Write config that sets the filaments directory to current Dir!
                let config_str = dbg! {Config::generate(&dir)}?;

                // create the config Dir
                let config_dir = get_config_dir();

                create_dir_all(config_dir).expect("creating the config dir should not error");

                let mut config_file = File::create(get_config_dir().join("config.ron"))
                    .context("Failed to create config file")?;

                write!(config_file, "{config_str}")?;

                println!("wrote config to {config_file:#?}");

                println!("Initialized successfully!");
            }

            Self::Zettel(zettel_sub_command) => {
                let conf = Config::parse()?;
                let mut kt = Kasten::instansiate(conf.fil_dir).await?;

                match zettel_sub_command {
                    ZettelSubcommand::New { title } => {
                        let zettel = Zettel::new(title, &mut kt, vec![]).await?;
                        println!("Zettel Created! {zettel:#?}");
                    }
                    ZettelSubcommand::List { by_tag: _by_tag } => {
                        unimplemented!()
                    }
                }
            }

            Self::Lsp => {
                // parse a Kasten
                let conf = Config::parse().with_context(|| "Failed to parse the config!!")?;
                let kt = Kasten::instansiate(conf.fil_dir)
                    .await
                    .with_context(|| "Failed to initialize a kasten!!")?;

                // get the in and out
                let stdin = tokio::io::stdin();
                let stdout = tokio::io::stdout();

                // start the LSP
                let (service, socket) = LspService::new(|client| Backend::new(client, kt));
                Server::new(stdin, stdout, socket).serve(service).await;
            }

            Self::Todo(command) => {
                let conf = Config::parse()?;
                let mut kt = Kasten::instansiate(conf.fil_dir).await?;

                match command {
                    super::TodoSubcommand::Group { name, parent_id } => {
                        let group = Group::new(name, parent_id, &mut kt).await?;
                        println!("created group {group:#?}");
                    }
                    super::TodoSubcommand::Task { name, parent_id } => {
                        //TODO: need to expose the due date and priority through the CLI
                        let task =
                            Task::new(name, parent_id, &mut kt, None, Priority::default()).await?;
                        println!("created task {task:#?}");
                    }
                }
            }
        }

        Ok(())
    }
}