use git2::build::{CheckoutBuilder, RepoBuilder};
use git2::{Cred, FetchOptions, PushOptions, RemoteCallbacks, Signature};
use serde::{Deserialize, Serialize};
use serde_yaml::Value;
use tempdir::TempDir;

#[tokio::main]
async fn main() -> eyre::Result<()> {
    let _ = dotenv::dotenv();
    color_eyre::install().unwrap();
    tracing_subscriber::fmt().pretty().init();

    let matches = clap::Command::new("update-deployment")
        .arg(clap::Arg::new("repo").long("repo").required(true))
        .arg(clap::Arg::new("service").long("service").required(true))
        .arg(clap::Arg::new("image").long("image").required(true))
        .arg(clap::Arg::new("path").long("path"))
        .get_matches();

    let repo = matches.get_one::<String>("repo").unwrap();
    let service = matches.get_one::<String>("service").unwrap();
    let image = matches.get_one::<String>("image").unwrap();
    let docker_compose_path = matches.get_one::<String>("path");

    tracing::info!(
        repo = repo,
        service = service,
        image = image,
        path = docker_compose_path,
        "updating deployment"
    );

    let tmpdir = TempDir::new("update-deployment")?;
    let tmpdir = tmpdir.path();

    tracing::info!(
        repo = repo,
        dest_dir = tmpdir.display().to_string(),
        "clone repo"
    );

    let mut cb = RemoteCallbacks::new();
    cb.credentials(|_, username, _| {
        if let Some(sock) = std::env::var("SSH_AUTH_SOCK").ok() {
            return Cred::ssh_key_from_agent(username.unwrap_or("git"));
        }
        let username = std::env::var("GIT_USERNAME").expect("GIT_USERNAME to be set");
        let password = std::env::var("GIT_PASSWORD").expect("GIT_PASSWORD to be set");
        Cred::userpass_plaintext(&username, &password)
    });
    let co = CheckoutBuilder::new();
    let mut fo = FetchOptions::new();
    fo.remote_callbacks(cb);
    RepoBuilder::new()
        .fetch_options(fo)
        .with_checkout(co)
        .clone(repo, tmpdir)?;

    let mut repo_dir = tmpdir.to_path_buf();
    repo_dir.push("repo");

    let repo = git2::Repository::clone(repo, &repo_dir)?;

    let dir = std::fs::read_dir(&repo_dir)?;
    for file in dir {
        println!("file: {}", file?.file_name().to_str().unwrap());
    }

    let (docker_compose_raw, docker_compose_path) =
        if let Some(docker_compose_path) = docker_compose_path {
            let mut path = repo_dir.clone();
            path.push(docker_compose_path);
            (tokio::fs::read(&path).await?, path)
        } else {
            let mut path = repo_dir.clone();
            path.push("docker-compose.yml");
            (tokio::fs::read(&path).await?, path)
        };

    let mut docker_compose: DockerCompose = serde_yaml::from_slice(docker_compose_raw.as_slice())?;

    tracing::info!(
        docker_compose = serde_json::to_string(&docker_compose)?,
        "found docker-compose.yml"
    );

    let service = docker_compose.services.get_mut(service);
    if let Some(service) = service {
        if let Some(img) = service.image.as_mut() {
            *img = image.clone();
        }
    }

    let dest_docker_compose = serde_yaml::to_string(&docker_compose)?;
    tokio::fs::write(docker_compose_path, dest_docker_compose).await?;

    let tree_id = {
        let mut index = repo.index()?;
        index.add_all(&["."], git2::IndexAddOption::DEFAULT, None)?;
        index.write()?;
        index.write_tree()?
    };

    let sig = Signature::now("kjuulh", "contact@kjuulh.io")?;
    let tree = repo.find_tree(tree_id)?;

    let head = repo.head()?;
    let commit = head.peel_to_commit()?;

    let _ = repo.commit(
        Some("HEAD"),
        &sig,
        &sig,
        "update: docker-compose",
        &tree,
        &[&commit],
    )?;

    let mut remote = repo.find_remote("origin")?;
    let mut cb = RemoteCallbacks::new();
    cb.credentials(|_, username, _| {
        if let Some(sock) = std::env::var("SSH_AUTH_SOCK").ok() {
            return Cred::ssh_key_from_agent(username.unwrap_or("git"));
        }
        let username = std::env::var("GIT_USERNAME").expect("GIT_USERNAME to be set");
        let password = std::env::var("GIT_PASSWORD").expect("GIT_PASSWORD to be set");
        Cred::userpass_plaintext(&username, &password)
    });
    remote.push(
        &["HEAD:refs/heads/main"],
        Some(PushOptions::new().remote_callbacks(cb)),
    )?;

    Ok(())
}
use std::collections::BTreeMap as Map;

#[derive(Clone, Debug, Serialize, Deserialize)]
struct DockerCompose {
    #[serde(flatten)]
    pub other: Map<String, Value>,
    pub services: Map<String, Service>,
}

#[derive(Clone, Debug, Serialize, Deserialize)]
struct Service {
    pub image: Option<String>,
    #[serde(flatten)]
    pub other: Map<String, Value>,
}