//! filebrowser-ng server.
//!
//! Library target so the HTTP app can be exercised from integration tests
//! (via `tower::ServiceExt::oneshot`) without binding a real port. The
//! `filebrowser-ng` binary is a thin wrapper around [`run`].

use std::net::{IpAddr, SocketAddr};
use std::sync::Arc;

use anyhow::{bail, Context};
use clap::Parser;
use tower_http::trace::TraceLayer;

pub mod api;
pub mod archive;
mod assets;
pub mod auth;
pub mod cli;
pub mod db;
pub mod error;
pub mod fs;

use crate::cli::Cli;
use crate::db::Db;
use crate::error::AppState;

/// Validate the CLI config and build the running state + router without
/// binding the port (so tests can exercise everything up to `serve`).
pub async fn build_app(cli: &Cli) -> anyhow::Result<(axum::Router, SocketAddr)> {
    let root = cli
        .root
        .canonicalize()
        .with_context(|| format!("cannot resolve root folder: {}", cli.root.display()))?;
    if !root.is_dir() {
        bail!("root folder is not a directory: {}", root.display());
    }

    let db = Db::open(&cli.db).await?;

    let state = Arc::new(AppState {
        db,
        root: root.clone(),
        https: cli.https,
    });

    let app = api::router(state).layer(TraceLayer::new_for_http());

    let ip: IpAddr = cli.bind.parse().context("invalid --bind address")?;
    let addr = SocketAddr::new(ip, cli.port);
    Ok((app, addr))
}

/// Parse the CLI, initialize logging and serve until the process is killed.
pub async fn run() -> anyhow::Result<()> {
    tracing_subscriber::fmt()
        .with_env_filter(
            tracing_subscriber::EnvFilter::try_from_default_env()
                .unwrap_or_else(|_| "info,tower_http=warn".into()),
        )
        .init();

    let cli = Cli::parse();
    let (app, addr) = build_app(&cli).await?;
    let listener = tokio::net::TcpListener::bind(addr)
        .await
        .with_context(|| format!("cannot bind to {addr}"))?;

    tracing::info!(root = %cli.root.display(), "filebrowser-ng starting");
    tracing::info!(addr = %addr, "listening (pass --bind 0.0.0.0 to expose beyond localhost)");
    axum::serve(listener, app).await?;
    Ok(())
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::cli::Cli;

    fn cli(root: &std::path::Path, db: &std::path::Path) -> Cli {
        Cli {
            root: root.to_path_buf(),
            db: db.to_path_buf(),
            port: 8080,
            bind: "127.0.0.1".into(),
            https: false,
        }
    }

    #[tokio::test]
    async fn build_app_ok() {
        let tmp = tempfile::tempdir().unwrap();
        std::fs::create_dir_all(tmp.path().join("sub")).unwrap();
        let c = cli(tmp.path(), &tmp.path().join("db.sqlite"));
        let (app, addr) = build_app(&c).await.unwrap();
        let _ = app; // Router built fine
        assert_eq!(addr.to_string(), "127.0.0.1:8080");
    }

    #[tokio::test]
    async fn build_app_missing_root_fails() {
        let tmp = tempfile::tempdir().unwrap();
        let c = cli(
            &tmp.path().join("no-such-root"),
            &tmp.path().join("db.sqlite"),
        );
        assert!(build_app(&c).await.is_err());
    }

    #[tokio::test]
    async fn build_app_root_must_be_directory() {
        let tmp = tempfile::tempdir().unwrap();
        let file = tmp.path().join("a-file");
        std::fs::write(&file, "x").unwrap();
        let c = cli(&file, &tmp.path().join("db.sqlite"));
        assert!(build_app(&c).await.is_err());
    }

    #[tokio::test]
    async fn build_app_rejects_bad_bind() {
        let tmp = tempfile::tempdir().unwrap();
        let mut c = cli(tmp.path(), &tmp.path().join("db.sqlite"));
        c.bind = "not-an-ip".into();
        assert!(build_app(&c).await.is_err());
    }

    #[tokio::test]
    async fn build_app_custom_port_bind() {
        let tmp = tempfile::tempdir().unwrap();
        let mut c = cli(tmp.path(), &tmp.path().join("db.sqlite"));
        c.port = 9999;
        c.bind = "0.0.0.0".into();
        let (_app, addr) = build_app(&c).await.unwrap();
        assert_eq!(addr.to_string(), "0.0.0.0:9999");
    }
}