use std::{env::Args, sync::Arc};

use async_trait::async_trait;

pub struct CuddleCI {
    pr_action: Arc<dyn PullRequestAction + Send + Sync>,
    main_action: Arc<dyn MainAction + Send + Sync>,
    release_action: Arc<dyn ReleaseAction + Send + Sync>,
}

impl CuddleCI {
    pub fn new(
        pr: Arc<dyn PullRequestAction + Send + Sync>,
        main: Arc<dyn MainAction + Send + Sync>,
        release: Arc<dyn ReleaseAction + Send + Sync>,
    ) -> Self {
        Self {
            pr_action: pr,
            main_action: main,
            release_action: release,
        }
    }

    pub fn with_pull_request(&mut self, pr: Arc<dyn PullRequestAction + Send + Sync>) -> &mut Self {
        self.pr_action = pr;

        self
    }

    pub fn with_main(&mut self, main: Arc<dyn MainAction + Send + Sync>) -> &mut Self {
        self.main_action = main;

        self
    }

    pub fn with_release(&mut self, release: Arc<dyn ReleaseAction + Send + Sync>) -> &mut Self {
        self.release_action = release;

        self
    }

    pub async fn execute(&mut self, args: impl IntoIterator<Item = &str>) -> eyre::Result<()> {
        let matches = clap::Command::new("cuddle-ci")
            .about("is a wrapper around common CI actions")
            .subcommand(clap::Command::new("pr"))
            .subcommand(clap::Command::new("main"))
            .subcommand(clap::Command::new("release"))
            .subcommand_required(true)
            .try_get_matches_from(args.into_iter())?;

        match matches.subcommand() {
            Some((name, args)) => match (name, args) {
                ("pr", args) => {
                    eprintln!("starting pr validate");
                    self.pr_action.execute_pull_request().await?;
                    eprintln!("finished pr validate");
                }
                ("main", args) => {
                    eprintln!("starting main validate");
                    self.main_action.execute_main().await?;
                    eprintln!("finished main validate");
                }
                ("release", args) => {
                    eprintln!("starting release validate");
                    self.release_action.execute_release().await?;
                    eprintln!("finished release validate");
                }
                (command_name, _) => {
                    eyre::bail!("command is not recognized: {}", command_name)
                }
            },
            None => eyre::bail!("command required a subcommand [pr, main, release] etc."),
        }

        Ok(())
    }
}

impl Default for CuddleCI {
    fn default() -> Self {
        Self::new(
            Arc::new(DefaultPullRequestAction {}),
            Arc::new(DefaultMainAction {}),
            Arc::new(DefaultReleaseAction {}),
        )
    }
}

#[async_trait]
pub trait PullRequestAction {
    async fn execute_pull_request(&self) -> eyre::Result<()> {
        eprintln!("validate pull request: noop");
        Ok(())
    }
}

pub struct DefaultPullRequestAction {}
#[async_trait]
impl PullRequestAction for DefaultPullRequestAction {}

#[async_trait]
pub trait MainAction {
    async fn execute_main(&self) -> eyre::Result<()> {
        eprintln!("validate main: noop");
        Ok(())
    }
}

pub struct DefaultMainAction {}
#[async_trait]
impl MainAction for DefaultMainAction {}

#[async_trait]
pub trait ReleaseAction {
    async fn execute_release(&self) -> eyre::Result<()> {
        eprintln!("validate release: noop");

        Ok(())
    }
}

pub struct DefaultReleaseAction {}
#[async_trait]
impl ReleaseAction for DefaultReleaseAction {}

#[cfg(test)]
mod test {
    use super::*;

    #[tokio::test]
    async fn test_can_call_default() -> eyre::Result<()> {
        CuddleCI::default().execute(["cuddle-ci", "pr"]).await?;

        Ok(())
    }

    #[tokio::test]
    async fn test_fails_on_no_command() -> eyre::Result<()> {
        let res = CuddleCI::default().execute(["cuddle-ci"]).await;

        assert!(res.is_err());

        Ok(())
    }

    #[tokio::test]
    async fn test_fails_on_wrong_command() -> eyre::Result<()> {
        let res = CuddleCI::default()
            .execute(["cuddle-ci", "something"])
            .await;

        assert!(res.is_err());

        Ok(())
    }
}