use std::{
    collections::HashMap,
    path::{Path, PathBuf},
    process::Stdio,
};

use crate::global_cache::save_cache;
use anyhow::{anyhow, bail};
use async_recursion::async_recursion;
use itertools::Itertools;
use serde_json::value::RawValue;
use tokio::{
    fs::{create_dir_all, metadata, remove_dir_all, File},
    io::AsyncWriteExt,
    process::Command,
};
use uuid::Uuid;
use windmill_common::{
    error::{self, Error},
    utils::calculate_hash,
    worker::{copy_dir_recursively, write_file, Connection},
};
use windmill_parser::Arg;
use windmill_parser_java::parse_java_sig_meta;
use windmill_queue::{append_logs, CanceledBy, MiniPulledJob};

use crate::{
    common::{
        build_command_with_isolation, create_args_and_out_file, get_reserved_variables,
        read_result, resolve_job_timeout, resolve_nsjail_timeout, resolve_nsjail_tmp_mount_block,
        start_child_process, OccupancyMetrics,
    },
    handle_child, is_sandboxing_enabled, read_ee_registry_bool_with_workspace_override,
    read_ee_registry_with_workspace_override,
    universal_pkg_installer::{par_install_language_dependencies_all_at_once, RequiredDependency},
    worker_utils::JobPingHeartbeat,
    COURSIER_CACHE_DIR, DISABLE_NUSER, JAVA_CACHE_DIR, JAVA_HOME_DIR, JAVA_REPOSITORY_DIR,
    MAVEN_REPOS, NO_DEFAULT_MAVEN, NSJAIL_PATH, PATH_ENV, PROXY_ENVS,
};
use windmill_common::client::AuthedClient;

lazy_static::lazy_static! {
    static ref JAVA_CONCURRENT_DOWNLOADS: usize = std::env::var("JAVA_CONCURRENT_DOWNLOADS").ok().map(|flag| flag.parse().unwrap_or(20)).unwrap_or(20);
    static ref JAVA_PATH: String = std::env::var("JAVA_PATH").unwrap_or_else(|_| "/usr/bin/java".to_string());
    static ref JAVAC_PATH: String = std::env::var("JAVAC_PATH").unwrap_or_else(|_| "/usr/bin/javac".to_string());
    static ref CS_PATH: String = std::env::var("COURSIER_PATH").unwrap_or_else(|_| "/usr/bin/coursier".to_string());
    static ref STOREPASS: String = std::env::var("JAVA_STOREPASS").unwrap_or("123456".into());
    static ref TRUST_STORE_PATH: String = std::env::var("JAVA_TRUST_STORE_PATH").unwrap_or("/usr/local/share/ca-certificates/truststore.jks".into());
}

const NSJAIL_CONFIG_RUN_JAVA_CONTENT: &str = include_str!("../nsjail/run.java.config.proto");

#[allow(dead_code)]
pub(crate) struct JobHandlerInput<'a> {
    pub base_internal_url: &'a str,
    pub canceled_by: &'a mut Option<CanceledBy>,
    pub client: &'a AuthedClient,
    pub parent_runnable_path: Option<String>,
    pub conn: &'a Connection,
    pub envs: HashMap<String, String>,
    pub inner_content: &'a str,
    pub job: &'a MiniPulledJob,
    pub job_dir: &'a str,
    pub mem_peak: &'a mut i32,
    pub occupancy_metrics: &'a mut OccupancyMetrics,
    pub requirements_o: Option<&'a String>,
    pub shared_mount: &'a str,
    pub worker_name: &'a str,
    pub modules: Option<&'a HashMap<String, windmill_common::scripts::ScriptModule>>,
}

pub async fn handle_java_job<'a>(mut args: JobHandlerInput<'a>) -> Result<Box<RawValue>, Error> {
    // --- Prepare ---
    {
        prepare(&mut args).await?;
    }
    // --- Generate Lockfile ---

    let deps = resolve(
        &args.job.id,
        &args.inner_content,
        &args.job_dir,
        &args.conn,
        &args.job.workspace_id,
    )
    .await?;

    // --- Install ---

    let classpath = install(&mut args, deps).await?;

    // --- Build .java files ---
    {
        compile(&mut args, &classpath).await?;
    }
    // --- Run ---
    {
        run(&mut args, &classpath).await?;
    }
    // --- Retrieve results ---
    {
        read_result(&args.job_dir, None).await
    }
}

async fn prepare<'a>(
    JobHandlerInput { job, conn, job_dir, client, inner_content, .. }: &mut JobHandlerInput<'a>,
) -> Result<(), Error> {
    // Create needed files
    {
        create_args_and_out_file(&client, job, job_dir, conn).await?;
        let app_path = format!("{}/src/main/java/net/script/", job_dir);
        create_dir_all(&app_path).await?;
        File::create(format!("{app_path}/App.java"))
            .await?
            .write_all(&wrap(inner_content)?.into_bytes())
            .await?;
        File::create(format!("{app_path}/Main.java"))
            .await?
            .write_all(
                &format!(
                    "package net.script;\n{MINI_CLIENT_IMPORTS}\n{}\n{MINI_CLIENT}",
                    inner_content
                )
                .into_bytes(),
            )
            .await?;
    }
    Ok(())
}

/// Returns the java home dir to use. If a workspace-specific maven_settings_xml
/// override exists, writes it to `job_dir/.m2/settings.xml` and returns `job_dir`.
/// Otherwise returns the global JAVA_HOME_DIR.
async fn get_java_home_with_ws_settings(
    job_id: &Uuid,
    w_id: &str,
    job_dir: &str,
    conn: &Connection,
) -> String {
    let ws_settings_xml = {
        let registries = crate::WORKSPACE_REGISTRIES.read().await;
        registries
            .as_ref()
            .and_then(|m| m.get(w_id))
            .and_then(|ws| ws.get("maven_settings_xml"))
            .and_then(|v| v.as_str().map(|s| s.to_string()))
    };
    if let Some(ref content) = ws_settings_xml {
        if !content.trim().is_empty() {
            if cfg!(feature = "enterprise") {
                let m2_dir = format!("{job_dir}/.m2");
                if let Err(e) = create_dir_all(&m2_dir).await {
                    tracing::error!("Failed to create per-job .m2 directory: {e:#}");
                    return JAVA_HOME_DIR.to_string();
                }
                if let Err(e) =
                    windmill_common::worker::write_file(&m2_dir, "settings.xml", content)
                {
                    tracing::error!("Failed to write per-job Maven settings.xml: {e:#}");
                    return JAVA_HOME_DIR.to_string();
                }
                tracing::debug!(
                    "Using workspace-specific Maven settings.xml for job {} in workspace {}",
                    job_id,
                    w_id
                );
                return job_dir.to_string();
            } else {
                append_logs(
                    job_id,
                    w_id,
                    "Private registry (maven settings.xml) configuration ignored: this feature requires Windmill Enterprise Edition\n".to_string(),
                    conn,
                )
                .await;
            }
        }
    }
    JAVA_HOME_DIR.to_string()
}

pub async fn resolve<'a>(
    job_id: &Uuid,
    code: &str,
    job_dir: &str,
    conn: &Connection,
    w_id: &str,
) -> Result<String, Error> {
    let deps = {
        let find_requirements = code.lines().find_position(|x| {
            x.starts_with("//requirements:") || x.starts_with("// requirements:")
        });

        let specified_deps = if let Some((pos, _)) = find_requirements {
            code.lines()
                .skip(pos + 1)
                .map_while(|x| {
                    if x.starts_with("//") {
                        Some(x.replace("//", "").trim().to_owned())
                    } else {
                        None
                    }
                })
                .collect::<Vec<String>>()
        } else {
            Default::default()
        };

        let mut deps = vec![
            // Default requirements
            "com.fasterxml.jackson.core:jackson-databind:2.9.8".to_owned(),
        ];
        deps.extend(specified_deps);
        deps.join("\n")
    };

    let ws_suffix = crate::workspace_registry_cache_suffix(w_id).await;
    let req_hash = format!("java-{}{ws_suffix}", calculate_hash(&deps));
    if let Connection::Sql(db) = conn {
        if let Some(cached) = sqlx::query_scalar!(
            "SELECT lockfile FROM pip_resolution_cache WHERE hash = $1",
            req_hash
        )
        .fetch_optional(db)
        .await?
        {
            return Ok(cached);
        }
    }
    let lock = {
        append_logs(
            job_id,
            w_id,
            format!("\n--- RESOLVING LOCKFILE ---\n"),
            &conn,
        )
        .await;

        let mut cmd = Command::new(if cfg!(windows) {
            "java"
        } else {
            JAVA_PATH.as_str()
        });
        let java_home = get_java_home_with_ws_settings(job_id, w_id, job_dir, conn).await;
        cmd.env_clear()
            .current_dir(job_dir.to_owned())
            .env("PATH", PATH_ENV.as_str())
            .env("HOME", &java_home)
            .env("COURSIER_CACHE", &*COURSIER_CACHE_DIR)
            .envs(PROXY_ENVS.clone());

        // Configure proxies
        {
            let jps = parse_proxy()?;
            if let Some(val) = jps.https_host {
                cmd.arg(&format!("-Dhttps.proxyHost={}", val));
            }
            if let Some(val) = jps.https_port {
                cmd.arg(&format!("-Dhttps.proxyPort={}", val));
            }
            if let Some(val) = jps.http_host {
                cmd.arg(&format!("-Dhttp.proxyHost={}", val));
            }
            if let Some(val) = jps.http_port {
                cmd.arg(&format!("-Dhttp.proxyPort={}", val));
            }
            if let Some(val) = jps.no_proxy {
                cmd.arg(&format!("-Dhttp.nonProxyHosts=\"{}\"", val));
            }
        }
        cmd.arg(&format!("-Duser.home={}", java_home));
        if metadata(TRUST_STORE_PATH.clone()).await.is_ok() {
            cmd.args(&[
                &format!("-Djavax.net.ssl.trustStore={}", *TRUST_STORE_PATH),
                &format!("-Djavax.net.ssl.trustStorePassword={}", *STOREPASS),
            ]);
        }
        let no_default = get_no_default(*job_id, w_id, conn).await;
        cmd.args(&[
            "-jar",
            &CS_PATH,
            "resolve",
            &no_default,
            "--parallel",
            &format!("{}", *JAVA_CONCURRENT_DOWNLOADS),
            "--cache",
            &*COURSIER_CACHE_DIR,
        ])
        .args(&get_repos(job_id, w_id, conn).await)
        .args(&deps.split("\n").collect_vec())
        .stderr(Stdio::piped());

        #[cfg(windows)]
        {
            cmd.env("SystemRoot", crate::SYSTEM_ROOT.as_str())
                .env("USERPROFILE", crate::USERPROFILE_ENV.as_str())
                .env(
                    "TMP",
                    std::env::var("TMP").unwrap_or_else(|_| String::from("/tmp")),
                );
        }
        // The lockfile has to be read from a clean stdout, so this cannot go through handle_child's
        // polling loop. That leaves resolution with neither a ping nor a time bound of its own: it
        // needs the heartbeat not to be reaped as a zombie mid-resolution, and the timeout so a
        // wedged registry connection cannot park the job in `running` forever.
        cmd.kill_on_drop(true);
        let (timeout, ..) = resolve_job_timeout(conn, w_id, *job_id, None).await;
        let _heartbeat = JobPingHeartbeat::start(conn, *job_id, "java lockfile resolution");
        let output = tokio::time::timeout(timeout, cmd.output())
            .await
            .map_err(|_| {
                Error::ExecutionErr(format!(
                    "resolving the java lockfile timed out after {}s",
                    timeout.as_secs()
                ))
            })??;
        // Check if the command was successful
        if output.status.success() {
            String::from_utf8(output.stdout).expect("Failed to convert output to String")
        } else {
            let stderr =
                String::from_utf8(output.stderr).expect("Failed to convert error output to String");
            return Err(error::Error::internal_err(stderr));
        }
    };

    if let Connection::Sql(db) = conn {
        sqlx::query!(
        "INSERT INTO pip_resolution_cache (hash, lockfile, expiration) VALUES ($1, $2, now() + ('5 mins')::interval) ON CONFLICT (hash) DO UPDATE SET lockfile = EXCLUDED.lockfile",
        req_hash,
            lock.clone(),
        )
        .fetch_optional(db)
        .await?;
    }

    append_logs(job_id, w_id, format!("\n{}", &lock), &conn).await;
    Ok(lock)
}

async fn install<'a>(
    JobHandlerInput { worker_name, job, conn, job_dir, .. }: &mut JobHandlerInput<'a>,
    deps: String,
) -> Result<String, Error> {
    let deps = deps
        .lines()
        .map(|line| {
            let unparsed_dep = line.replace(":jar", "").replace(":lib", "");
            let mut it = unparsed_dep.split(":");

            match (it.next(), it.next(), it.next()) {
                (Some(group_id), Some(artifact_id), Some(version)) => {
                    let path = format!(
                        "{}/{}/{artifact_id}/{version}",
                        *JAVA_REPOSITORY_DIR,
                        group_id.replace(".", "/")
                    );
                    Ok(RequiredDependency {
                        path,
                        _s3_handle: format!("{group_id}:{artifact_id}:{version}"),
                        display_name: format!("{artifact_id}:{version}"),
                        custom_payload: (),
                    })
                }
                _ => anyhow::bail!("{line} is not parsable"),
            }
        })
        .collect::<anyhow::Result<Vec<RequiredDependency<_>>>>()?;

    let classpath = deps
        .clone()
        .into_iter()
        .map(|RequiredDependency { path, .. }| path + "/*")
        .collect_vec()
        .join(":")
        + ":target";

    #[cfg(windows)]
    let classpath = classpath.replace(":", ";");

    tracing::debug!(
        workspace_id = %job.workspace_id,
        "JAVA classpath: {}", &classpath
    );
    let java_home = get_java_home_with_ws_settings(&job.id, &job.workspace_id, job_dir, conn).await;
    let (repos, no_default, trust_store_metadata) = (
        get_repos(&job.id, &job.workspace_id, conn).await,
        get_no_default(job.id, &job.workspace_id, conn).await,
        metadata(TRUST_STORE_PATH.clone()).await,
    );
    let job_dir = job_dir.to_owned();
    let fetch_dir = format!("{}/tmp-fetch-{}", *JAVA_CACHE_DIR, Uuid::new_v4());
    let (cmd_fetch_dir, postinstall_fetch_dir) = (fetch_dir.clone(), fetch_dir.clone());
    let installed = par_install_language_dependencies_all_at_once(
        deps,
        "java",
        "java",
        true,
        *JAVA_CONCURRENT_DOWNLOADS,
        true,
        move |dependencies| {
            let mut cmd = Command::new(if cfg!(windows) {
                "java"
            } else {
                JAVA_PATH.as_str()
            });
            let artifacts = dependencies
                .into_iter()
                .map(|e| e._s3_handle)
                .collect::<Vec<String>>();
            cmd.env_clear()
                .current_dir(&job_dir)
                .env("PATH", PATH_ENV.as_str())
                .env("HOME", &java_home)
                .env("COURSIER_CACHE", &*COURSIER_CACHE_DIR)
                .envs(PROXY_ENVS.clone());
            // Configure proxies
            {
                let jps = parse_proxy()?;
                if let Some(val) = jps.https_host {
                    cmd.arg(&format!("-Dhttps.proxyHost={}", val));
                }
                if let Some(val) = jps.https_port {
                    cmd.arg(&format!("-Dhttps.proxyPort={}", val));
                }
                if let Some(val) = jps.http_host {
                    cmd.arg(&format!("-Dhttp.proxyHost={}", val));
                }
                if let Some(val) = jps.http_port {
                    cmd.arg(&format!("-Dhttp.proxyPort={}", val));
                }
                if let Some(val) = jps.no_proxy {
                    cmd.arg(&format!("-Dhttp.nonProxyHosts=\"{}\"", val));
                }
            }

            cmd.arg(&format!("-Duser.home={}", java_home));
            if trust_store_metadata.is_ok() {
                cmd.args(&[
                    &format!("-Djavax.net.ssl.trustStore={}", *TRUST_STORE_PATH),
                    &format!("-Djavax.net.ssl.trustStorePassword={}", *STOREPASS),
                ]);
            }
            cmd.args(&[
                "-jar",
                &CS_PATH,
                "fetch",
                &no_default,
                "--quiet",
                "--parallel",
                &format!("{}", *JAVA_CONCURRENT_DOWNLOADS),
                "--cache",
                &cmd_fetch_dir,
            ])
            .args(&repos)
            .arg("--intransitive")
            .args(artifacts)
            .stdout(Stdio::piped())
            .stderr(Stdio::piped());
            #[cfg(windows)]
            {
                cmd.env("SystemRoot", crate::SYSTEM_ROOT.as_str())
                    .env("USERPROFILE", crate::USERPROFILE_ENV.as_str())
                    .env(
                        "TMP",
                        std::env::var("TMP").unwrap_or_else(|_| String::from("/tmp")),
                    );
            }

            Ok(cmd)
        },
        async move |dependencies| {
            Ok(
                move_to_repository(&postinstall_fetch_dir, &*JAVA_REPOSITORY_DIR, &dependencies)
                    .await?,
            )
        },
        &job.id,
        &job.workspace_id,
        worker_name,
        is_sandboxing_enabled(),
        conn,
    )
    .await;

    // coursier failing against the registry bails before the postinstall step ever runs, so the
    // cache it was writing into has to be reclaimed on every path out
    match remove_dir_all(&fetch_dir).await {
        Err(e) if e.kind() != std::io::ErrorKind::NotFound => {
            tracing::warn!("could not remove java fetch dir {fetch_dir}: {e}")
        }
        _ => {}
    }
    installed?;
    Ok(classpath)
}

/// Copies every fetched artifact out of coursier's cache into the `<group as path>/<artifact>/
/// <version>` location the classpath is built from. Coursier's cache is laid out as
/// `<scheme>/<host>/<registry url path>/<group as path>/...`, so the depth at which the maven
/// layout starts varies with the registry url and only the coordinate can be matched on.
async fn move_to_repository(
    fetch_dir: &str,
    repository_dir: &str,
    deps: &[RequiredDependency<()>],
) -> anyhow::Result<()> {
    struct Wanted {
        coordinate: Vec<String>,
        destination: String,
        display_name: String,
        found: bool,
    }

    #[async_recursion]
    async fn find_and_copy(
        dir: &Path,
        // components walked past below the fetch dir, compared against coordinates one component
        // at a time so that windows' native separator cannot defeat the match
        below: &mut Vec<String>,
        wanted: &mut Vec<Wanted>,
    ) -> anyhow::Result<()> {
        if wanted.iter().all(|w| w.found) {
            return Ok(());
        }
        let (mut subdirs, mut holds_artifact) = (vec![], false);
        let mut entries = tokio::fs::read_dir(dir).await?;
        while let Some(entry) = entries.next_entry().await? {
            let name = entry.file_name().to_string_lossy().into_owned();
            if entry.file_type().await?.is_dir() {
                subdirs.push((name, entry));
            } else {
                // coursier's own bookkeeping (`.<name>.checked`, `.<name>.error`, checksums) is
                // dot-prefixed; only a downloaded artifact is not
                holds_artifact |= !name.starts_with('.');
            }
        }
        // a repository coursier probed and did not get the artifact from keeps a directory at the
        // coordinate holding nothing but that bookkeeping, and default repositories are probed
        // before the configured ones, so claiming the first match would cache an empty directory
        // as the installed artifact
        if holds_artifact {
            if let Some(w) = wanted
                .iter_mut()
                .find(|w| !w.found && below.ends_with(&w.coordinate))
            {
                copy_dir_recursively(dir, &PathBuf::from(&w.destination))?;
                w.found = true;
                return Ok(());
            }
        }
        for (name, entry) in subdirs {
            below.push(name);
            find_and_copy(&entry.path(), below, wanted).await?;
            below.pop();
        }
        Ok(())
    }

    let mut wanted = deps
        .iter()
        .map(|RequiredDependency { path, display_name, .. }| {
            let suffix = path
                .strip_prefix(repository_dir)
                .filter(|suffix| suffix.starts_with('/'))
                .ok_or_else(|| anyhow!("Internal Error: {path} is not under {repository_dir}"))?;
            Ok(Wanted {
                coordinate: suffix
                    .split('/')
                    .filter(|component| !component.is_empty())
                    .map(str::to_owned)
                    .collect(),
                destination: path.clone(),
                display_name: display_name.clone(),
                found: false,
            })
        })
        .collect::<anyhow::Result<Vec<_>>>()?;
    // longest coordinate first: a group id ending in another one's coordinates (com.org.foo:bar
    // over org.foo:bar) would otherwise be free to claim the shorter one's directory
    wanted.sort_by_key(|w| std::cmp::Reverse(w.coordinate.len()));

    find_and_copy(&PathBuf::from(fetch_dir), &mut vec![], &mut wanted).await?;

    let missing = wanted
        .iter()
        .filter(|w| !w.found)
        .map(|w| w.display_name.as_str())
        .sorted()
        .collect_vec();
    if !missing.is_empty() {
        bail!(
            "the configured maven repositories did not serve: {}. \
            Coursier reported success but no artifact for them was found in its cache.",
            missing.join(", ")
        );
    }
    Ok(())
}

async fn compile<'a>(
    JobHandlerInput {
        occupancy_metrics,
        mem_peak,
        canceled_by,
        worker_name,
        job,
        conn,
        job_dir,
        client,
        envs,
        base_internal_url,
        inner_content,
        requirements_o,
        parent_runnable_path,
        modules,
        ..
    }: &mut JobHandlerInput<'a>,
    classpath: &'a str,
    // plugins: Vec<&'a str>,
) -> Result<(), Error> {
    // The cached artifact is the whole `target/` dir, and companion modules are written
    // into the job dir before this runs, so their content can land in it.
    fn compute_hash(
        code: &str,
        requirements_o: Option<&String>,
        modules: Option<&HashMap<String, windmill_common::scripts::ScriptModule>>,
    ) -> String {
        let base = format!(
            "{}{}",
            code,
            requirements_o
                .as_ref()
                .map(|x| x.to_string())
                .unwrap_or_default()
        );
        crate::worker::artifact_cache_name(base, modules)
    }
    let reserved_variables =
        get_reserved_variables(job, &client.token, conn, parent_runnable_path.clone()).await?;
    let ws_suffix = crate::workspace_registry_cache_suffix(&job.workspace_id).await;
    let mut hash = compute_hash(inner_content, *requirements_o, *modules);
    hash.push_str(&ws_suffix);
    let bin_path = format!("{}/{hash}", *JAVA_CACHE_DIR);
    let remote_path = format!("java_jar/{hash}");
    let (cache, ..) = crate::global_cache::load_cache(&bin_path, &remote_path, true).await;

    if cache {
        let target = format!("{job_dir}/target");

        #[cfg(unix)]
        let symlink = std::os::unix::fs::symlink(&bin_path, &target);
        #[cfg(windows)]
        let symlink = copy_dir_recursively(&PathBuf::from(&bin_path), &PathBuf::from(&target));

        symlink.map_err(|e| {
            Error::ExecutionErr(format!(
                "could not copy cached binary from {bin_path} to {job_dir}/main: {e:?}"
            ))
        })?;
    } else {
        // let plugin_registry = format!("{job_dir}/plugin-registry");
        let child = {
            append_logs(
                &job.id,
                &job.workspace_id,
                format!("\n--- COMPILING .JAVA FILES\n"),
                &conn,
            )
            .await;

            let mut cmd = Command::new(if cfg!(windows) {
                "javac"
            } else {
                JAVAC_PATH.as_str()
            });
            cmd.env_clear()
                .current_dir(job_dir.to_owned())
                .env("PATH", PATH_ENV.as_str())
                .env("HOME", &*JAVA_HOME_DIR)
                .env("BASE_INTERNAL_URL", base_internal_url)
                .envs(envs)
                .envs(reserved_variables)
                .envs(PROXY_ENVS.clone())
                .args(&[
                    "-classpath",
                    &classpath,
                    "src/main/java/net/script/Main.java",
                    "src/main/java/net/script/App.java",
                    "-d",
                    "./target",
                ])
                .stdout(Stdio::piped())
                .stderr(Stdio::piped());

            #[cfg(windows)]
            {
                cmd.env("SystemRoot", crate::SYSTEM_ROOT.as_str())
                    .env("USERPROFILE", crate::USERPROFILE_ENV.as_str())
                    .env(
                        "TMP",
                        std::env::var("TMP").unwrap_or_else(|_| String::from("/tmp")),
                    );
            }
            start_child_process(cmd, "javac", false).await?
        };
        handle_child::handle_child(
            &job.id,
            conn,
            mem_peak,
            canceled_by,
            child,
            is_sandboxing_enabled(),
            worker_name,
            &job.workspace_id,
            "javac",
            job.timeout,
            false,
            &mut Some(occupancy_metrics),
            None,
            None,
        )
        .await?;

        match save_cache(
            &bin_path,
            &format!("java_jar/{hash}"),
            &format!("{job_dir}/target"),
            true,
        )
        .await
        {
            Err(e) => {
                let em = format!(
                    "could not save {bin_path} to {} to java cache: {e:?}",
                    format!("{job_dir}/main"),
                );
                tracing::error!(em);
            }
            Ok(logs) => {
                tracing::trace!(logs);
            }
        }
    };

    Ok(())
}
async fn run<'a>(
    JobHandlerInput {
        occupancy_metrics,
        mem_peak,
        canceled_by,
        worker_name,
        job,
        conn,
        job_dir,
        shared_mount,
        client,
        envs,
        base_internal_url,
        parent_runnable_path,
        ..
    }: &mut JobHandlerInput<'a>,
    classpath: &'a str,
) -> Result<(), Error> {
    let reserved_variables =
        get_reserved_variables(job, &client.token, conn, parent_runnable_path.clone()).await?;

    let child = if !cfg!(windows) && is_sandboxing_enabled() {
        append_logs(
            &job.id,
            &job.workspace_id,
            format!("\n--- ISOLATED JAVA CODE EXECUTION ---\n"),
            &conn,
        )
        .await;

        let nsjail_timeout =
            resolve_nsjail_timeout(conn, &job.workspace_id, job.id, job.timeout).await;
        write_file(
            job_dir,
            "run.config.proto",
            &NSJAIL_CONFIG_RUN_JAVA_CONTENT
                .replace("{JOB_DIR}", job_dir)
                .replace("{CACHE_DIR}", &*JAVA_CACHE_DIR)
                .replace("{SHARED_MOUNT}", &shared_mount)
                // .replace("{CACHED_TARGET}", &shared_mount)
                .replace("{CLONE_NEWUSER}", &(!*DISABLE_NUSER).to_string())
                .replace(
                    "{TMP_MOUNT_BLOCK}",
                    &resolve_nsjail_tmp_mount_block(job_dir).await,
                )
                .replace("{TIMEOUT}", &nsjail_timeout),
        )?;
        let mut cmd = Command::new(NSJAIL_PATH.as_str());
        cmd.env_clear()
            .current_dir(job_dir)
            .env("PATH", PATH_ENV.as_str())
            .env("HOME", &*JAVA_HOME_DIR)
            .env("BASE_INTERNAL_URL", base_internal_url)
            .envs(envs)
            .envs(reserved_variables)
            .envs(crate::get_otel_context_envs(&job.id))
            .args(vec![
                "--config",
                "run.config.proto",
                "--",
                JAVA_PATH.as_str(),
            ]);
        if metadata(TRUST_STORE_PATH.clone()).await.is_ok() {
            cmd.args(&[
                &format!("-Djavax.net.ssl.trustStore={}", *TRUST_STORE_PATH),
                &format!("-Djavax.net.ssl.trustStorePassword={}", *STOREPASS),
            ]);
        }
        // Configure proxies
        {
            let jps = parse_proxy()?;
            if let Some(val) = jps.https_host {
                cmd.arg(&format!("-Dhttps.proxyHost={}", val));
            }
            if let Some(val) = jps.https_port {
                cmd.arg(&format!("-Dhttps.proxyPort={}", val));
            }
            if let Some(val) = jps.http_host {
                cmd.arg(&format!("-Dhttp.proxyHost={}", val));
            }
            if let Some(val) = jps.http_port {
                cmd.arg(&format!("-Dhttp.proxyPort={}", val));
            }
            if let Some(val) = jps.no_proxy {
                cmd.arg(&format!("-Dhttp.nonProxyHosts=\"{}\"", val));
            }
        }
        cmd.args(vec!["-classpath", &classpath, "net.script.App"]);
        cmd.stdout(Stdio::piped()).stderr(Stdio::piped());

        start_child_process(cmd, NSJAIL_PATH.as_str(), false).await?
    } else {
        append_logs(
            &job.id,
            &job.workspace_id,
            format!("\n--- JAVA CODE EXECUTION ---\n"),
            &conn,
        )
        .await;

        let java_executable = if cfg!(windows) {
            "java"
        } else {
            JAVA_PATH.as_str()
        };

        let mut cmd = build_command_with_isolation(java_executable, &[]);
        cmd.env_clear()
            .current_dir(job_dir.to_owned())
            .env("PATH", PATH_ENV.as_str())
            .env("HOME", &*JAVA_HOME_DIR)
            .env("BASE_INTERNAL_URL", base_internal_url)
            .envs(envs)
            .envs(reserved_variables)
            .envs(crate::get_otel_context_envs(&job.id));
        if metadata(TRUST_STORE_PATH.clone()).await.is_ok() {
            cmd.args(&[
                &format!("-Djavax.net.ssl.trustStore={}", *TRUST_STORE_PATH),
                &format!("-Djavax.net.ssl.trustStorePassword={}", *STOREPASS),
            ]);
        }
        // Configure proxies
        {
            let jps = parse_proxy()?;
            if let Some(val) = jps.https_host {
                cmd.arg(&format!("-Dhttps.proxyHost={}", val));
            }
            if let Some(val) = jps.https_port {
                cmd.arg(&format!("-Dhttps.proxyPort={}", val));
            }
            if let Some(val) = jps.http_host {
                cmd.arg(&format!("-Dhttp.proxyHost={}", val));
            }
            if let Some(val) = jps.http_port {
                cmd.arg(&format!("-Dhttp.proxyPort={}", val));
            }
            if let Some(val) = jps.no_proxy {
                cmd.arg(&format!("-Dhttp.nonProxyHosts=\"{}\"", val));
            }
        }
        cmd.args(&["-classpath", &classpath, "net.script.App"])
            .stdin(Stdio::null())
            .stdout(Stdio::piped())
            .stderr(Stdio::piped());

        #[cfg(windows)]
        {
            cmd.env("SystemRoot", crate::SYSTEM_ROOT.as_str())
                .env("USERPROFILE", crate::USERPROFILE_ENV.as_str())
                .env(
                    "TMP",
                    std::env::var("TMP").unwrap_or_else(|_| String::from("/tmp")),
                );
        }
        start_child_process(cmd, java_executable, false).await?
    };
    handle_child::handle_child(
        &job.id,
        conn,
        mem_peak,
        canceled_by,
        child,
        is_sandboxing_enabled(),
        worker_name,
        &job.workspace_id,
        "java",
        job.timeout,
        false,
        &mut Some(occupancy_metrics),
        None,
        None,
    )
    .await?;
    Ok(())
}

#[derive(Default, Debug)]
struct JavaProxySettings {
    http_host: Option<String>,
    http_port: Option<String>,
    https_host: Option<String>,
    https_port: Option<String>,
    no_proxy: Option<String>,
}
fn parse_proxy() -> anyhow::Result<JavaProxySettings> {
    let mut jps = JavaProxySettings::default();
    for (ident, mut val) in PROXY_ENVS.clone() {
        match ident {
            "HTTPS_PROXY" => {
                if !val.contains("://") {
                    val = format!("https://{val}");
                }
                let mut url = url::Url::parse(&val)?;
                let port = url.port();
                {
                    url.set_port(None).unwrap_or_default();
                    let host = url.as_str().replace("https://", "").replace("http://", "");
                    jps.https_host = Some(host);
                    if let Some(port) = port {
                        jps.https_port = Some(format!("{}", port));
                    }
                }
            }
            "HTTP_PROXY" => {
                if val.contains("https://") {
                    bail!("HTTP_PROXY url cannot contain https scheme.");
                }
                if !val.contains("http://") {
                    val = format!("http://{val}");
                }
                let mut url = url::Url::parse(&val)?;
                let port = url.port();
                // Make sure port and schema is not included in final url
                {
                    url.set_port(None).unwrap_or_default();
                    jps.http_host = Some(url.as_str().replace("http://", ""));
                    if let Some(port) = port {
                        jps.https_port = Some(format!("{}", port));
                    }
                }
            }
            // Java uses | instead of ,
            "NO_PROXY" => jps.no_proxy = Some(val.replace(",", "|")),
            _ => {}
        }
    }

    Ok(jps)
}
async fn get_repos(job_id: &Uuid, w_id: &str, conn: &Connection) -> Vec<String> {
    read_ee_registry_with_workspace_override(
        MAVEN_REPOS.read().await.clone(),
        "maven_repos",
        "maven repos",
        job_id,
        w_id,
        conn,
    )
    .await
    .as_ref()
    .map(|repos| {
        repos
            .trim()
            .split_whitespace()
            .into_iter()
            .map(|el| vec!["--repository".to_owned(), el.to_owned()])
            .collect_vec()
    })
    .unwrap_or_default()
    .concat()
}

async fn get_no_default(job_id: Uuid, w_id: &str, conn: &Connection) -> String {
    let global_value = NO_DEFAULT_MAVEN.load(std::sync::atomic::Ordering::Relaxed);
    let value = read_ee_registry_bool_with_workspace_override(
        global_value,
        "no_default_maven",
        "no default maven",
        &job_id,
        w_id,
        conn,
    )
    .await;
    if value { "--no-default" } else { "-q" }.into()
}

/// Wraps content script
/// that upon execution reads args.json (which are piped and transformed from previous flow step or top level inputs)
/// Also wrapper takes output of program and serializes to result.json (Which windmill will know how to use later)
fn wrap(inner_content: &str) -> Result<String, Error> {
    let sig = parse_java_sig_meta(inner_content)?;
    let ret_void = sig.returns_void;
    let spread = sig
        .main_sig
        .args
        .clone()
        .into_iter()
        .map(|Arg { name, .. }| {
            // Apply additional input transformation
            format!(" parsedArgs.{name}")
        })
        .collect_vec()
        .join(",");
    let args = sig
        .main_sig
        .args
        .clone()
        .into_iter()
        .map(|Arg { name, otyp, .. }| {
            // Apply additional input transformation
            format!("public {} {name};\n", otyp.unwrap())
        })
        .collect_vec()
        .join(" ");
    Ok(r#"
package net.script;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.FileOutputStream;
import net.script.Main;

public class App{

  public static class Args {ARGS}

  public static void main(String[] args) {
    try {
      InputStream fileInputStream = new FileInputStream("args.json");
      ObjectMapper mapper = new ObjectMapper();
      Args parsedArgs = mapper.readValue(fileInputStream, Args.class);
      fileInputStream.close();
      {MAIN_HANDLER}
      FileOutputStream fileOutputStream = new FileOutputStream("result.json");
      mapper.writeValue(fileOutputStream, res);
      fileOutputStream.close();

    } catch (Exception e) { // Catching general Exception
        e.printStackTrace(); // Handle the exception
    }
  }
}
            "#
    .replace(
        "{MAIN_HANDLER}",
        if ret_void {
            "
            Main.main(SPREAD);
            Object res = null;
            "
        } else {
            "
            Object res = Main.main(SPREAD);
            "
        },
    )
    .replace("SPREAD", &spread)
    .replace("ARGS", &args))
}
const MINI_CLIENT_IMPORTS: &str = r#"
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
"#;
const MINI_CLIENT: &str = r#"
class Wmill {
    public static String getVariable(String path) {
        var baseUrl = System.getenv("BASE_INTERNAL_URL");
        var workspace = System.getenv("WM_WORKSPACE");
        var uri = java.text.MessageFormat.format("{0}/api/w/{1}/variables/get_value/{2}", baseUrl, workspace, path);

        // Create an HttpRequest
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create(uri))
                .header("Authorization", "Bearer " + System.getenv("WM_TOKEN")) // Add the Authorization header
                .GET() // Set the request method to GET
                .build();

            // Send the request and get the response
        return HttpClient.newHttpClient().sendAsync(request, HttpResponse.BodyHandlers.ofString())
                .thenApply(HttpResponse::body)
                .join(); // Wait for the completion
    }
    public static String getResource(String path) {
        var baseUrl = System.getenv("BASE_INTERNAL_URL");
        var workspace = System.getenv("WM_WORKSPACE");
        var uri = java.text.MessageFormat.format("{0}/api/w/{1}/resources/get_value_interpolated/{2}", baseUrl, workspace, path);

        // Create an HttpRequest
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create(uri))
                .header("Authorization", "Bearer " + System.getenv("WM_TOKEN")) // Add the Authorization header
                .GET() // Set the request method to GET
                .build();

            // Send the request and get the response
        return HttpClient.newHttpClient().sendAsync(request, HttpResponse.BodyHandlers.ofString())
                .thenApply(HttpResponse::body)
                .join(); // Wait for the completion
    }
}
"#;

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

    fn dep(
        repository_dir: &str,
        group_path: &str,
        artifact: &str,
        version: &str,
    ) -> RequiredDependency<()> {
        RequiredDependency {
            path: format!("{repository_dir}/{group_path}/{artifact}/{version}"),
            _s3_handle: format!("{}:{artifact}:{version}", group_path.replace("/", ".")),
            display_name: format!("{artifact}:{version}"),
            custom_payload: (),
        }
    }

    async fn touch(path: &str) {
        let path = PathBuf::from(path);
        create_dir_all(path.parent().unwrap()).await.unwrap();
        File::create(path).await.unwrap();
    }

    #[tokio::test]
    async fn artifacts_are_found_whatever_the_registry_url_path_is() {
        let tmp = tempfile::tempdir().unwrap();
        let fetch_dir = tmp.path().join("fetch").to_str().unwrap().to_owned();
        let repository_dir = tmp.path().join("repository").to_str().unwrap().to_owned();

        // maven central has a single url segment before the maven layout, a nexus repository two,
        // and a root-hosted mirror none at all
        touch(&format!("{fetch_dir}/https/repo1.maven.org/maven2/commons-cli/commons-cli/1.4/commons-cli-1.4.jar")).await;
        touch(&format!("{fetch_dir}/https/nexus.local/repository/maven-public/com/google/code/gson/gson/2.8.9/gson-2.8.9.jar")).await;
        touch(&format!("{fetch_dir}/https/maven.local/org/apache/commons/commons-lang3/3.8.1/commons-lang3-3.8.1.jar")).await;

        let deps = vec![
            dep(&repository_dir, "commons-cli", "commons-cli", "1.4"),
            dep(&repository_dir, "com/google/code/gson", "gson", "2.8.9"),
            dep(
                &repository_dir,
                "org/apache/commons",
                "commons-lang3",
                "3.8.1",
            ),
        ];

        move_to_repository(&fetch_dir, &repository_dir, &deps)
            .await
            .unwrap();

        for (dep, jar) in deps.iter().zip([
            "commons-cli-1.4.jar",
            "gson-2.8.9.jar",
            "commons-lang3-3.8.1.jar",
        ]) {
            assert!(
                metadata(format!("{}/{jar}", dep.path)).await.is_ok(),
                "{} was not copied to {}",
                dep.display_name,
                dep.path
            );
        }
    }

    #[tokio::test]
    async fn the_empty_directory_a_404_leaves_behind_does_not_claim_the_coordinate() {
        let tmp = tempfile::tempdir().unwrap();
        let fetch_dir = tmp.path().join("fetch").to_str().unwrap().to_owned();
        let repository_dir = tmp.path().join("repository").to_str().unwrap().to_owned();

        // a repository that 404s is left with an empty directory at the coordinate. Each artifact
        // is served by one of the two repositories and left empty under the other, so whichever
        // one the walk reaches first, an empty directory precedes an artifact.
        let central = format!("{fetch_dir}/https/repo1.maven.org/maven2");
        let nexus = format!("{fetch_dir}/https/nexus.local/repository/maven-public");
        touch(&format!("{central}/com/corp/public/1.0/public-1.0.jar")).await;
        touch(&format!(
            "{nexus}/com/corp/public/1.0/.public-1.0.jar.error"
        ))
        .await;
        touch(&format!("{nexus}/com/corp/internal/1.0/internal-1.0.jar")).await;
        touch(&format!(
            "{central}/com/corp/internal/1.0/.internal-1.0.jar.error"
        ))
        .await;

        let deps = vec![
            dep(&repository_dir, "com/corp", "public", "1.0"),
            dep(&repository_dir, "com/corp", "internal", "1.0"),
        ];

        move_to_repository(&fetch_dir, &repository_dir, &deps)
            .await
            .unwrap();

        for (dep, jar) in deps.iter().zip(["public-1.0.jar", "internal-1.0.jar"]) {
            assert!(
                metadata(format!("{}/{jar}", dep.path)).await.is_ok(),
                "{} was not copied to {}",
                dep.display_name,
                dep.path
            );
        }
    }

    #[tokio::test]
    async fn a_group_id_ending_in_another_coordinate_does_not_claim_it() {
        let tmp = tempfile::tempdir().unwrap();
        let fetch_dir = tmp.path().join("fetch").to_str().unwrap().to_owned();
        let repository_dir = tmp.path().join("repository").to_str().unwrap().to_owned();
        let root = format!("{fetch_dir}/https/nexus.local/repository/maven-public");

        touch(&format!("{root}/org/foo/bar/1/bar-1.jar")).await;
        touch(&format!("{root}/com/org/foo/bar/1/bar-1.jar")).await;

        let deps = vec![
            dep(&repository_dir, "org/foo", "bar", "1"),
            dep(&repository_dir, "com/org/foo", "bar", "1"),
        ];

        move_to_repository(&fetch_dir, &repository_dir, &deps)
            .await
            .unwrap();

        for dep in &deps {
            assert!(
                metadata(format!("{}/bar-1.jar", dep.path)).await.is_ok(),
                "{} was not copied to {}",
                dep.display_name,
                dep.path
            );
        }
    }

    #[tokio::test]
    async fn artifact_missing_from_the_cache_is_named_in_the_error() {
        let tmp = tempfile::tempdir().unwrap();
        let fetch_dir = tmp.path().join("fetch").to_str().unwrap().to_owned();
        let repository_dir = tmp.path().join("repository").to_str().unwrap().to_owned();

        touch(&format!("{fetch_dir}/https/nexus.local/repository/maven-public/commons-cli/commons-cli/1.4/commons-cli-1.4.jar")).await;

        let deps = vec![
            dep(&repository_dir, "commons-cli", "commons-cli", "1.4"),
            dep(&repository_dir, "com/google/code/gson", "gson", "2.8.9"),
        ];

        let err = move_to_repository(&fetch_dir, &repository_dir, &deps)
            .await
            .unwrap_err()
            .to_string();

        assert!(err.contains("gson:2.8.9"), "unexpected error: {err}");
        assert!(!err.contains("commons-cli:1.4"), "unexpected error: {err}");
    }
}