use std::io::{BufRead, BufReader, Write};
use std::net::TcpListener;
use std::time::{Duration, Instant};

use super::*;

fn start_running_control_server() -> (String, thread::JoinHandle<()>) {
    let listener = TcpListener::bind("127.0.0.1:0").unwrap();
    let coordinator = listener.local_addr().unwrap().to_string();
    let server = thread::spawn(move || {
        let (mut stream, _) = listener.accept().unwrap();
        let mut reader = BufReader::new(stream.try_clone().unwrap());
        loop {
            let mut request = String::new();
            match reader.read_line(&mut request) {
                Ok(0) | Err(_) => break,
                Ok(_) => stream
                    .write_all(b"{\"type\":\"task_control\",\"process\":\"vp\",\"task\":\"task\",\"cancel_requested\":false,\"abort_requested\":false}\n")
                    .unwrap(),
            }
        }
    });
    (coordinator, server)
}

fn test_controlled_runner(
    coordinator: String,
    timeout: Duration,
) -> CoordinatorControlledProcessRunner {
    CoordinatorControlledProcessRunner {
        args: Args {
            coordinator,
            tenant: "tenant".to_owned(),
            project: "project".to_owned(),
            project_root: None,
            node: "node".to_owned(),
            enrollment_grant: None,
            public_key: None,
            control_poll_ms: 0,
            assignment_poll_ms: 1,
            emit_ready: false,
            worker: true,
        },
        process: "vp".to_owned(),
        task: "task".to_owned(),
        node_private_key: clusterflux_core::derive_ed25519_private_key_from_seed(
            "controlled-runner-test",
        ),
        debug_control: Arc::new(WasmDebugControl::default()),
        command_status: Arc::new(Mutex::new(None)),
        timeout,
    }
}

#[cfg(unix)]
#[test]
fn controlled_process_runner_kills_running_group_when_abort_is_polled() {
    let listener = TcpListener::bind("127.0.0.1:0").unwrap();
    let coordinator = listener.local_addr().unwrap().to_string();
    let server = thread::spawn(move || {
        let (mut stream, _) = listener.accept().unwrap();
        let mut request = String::new();
        BufReader::new(stream.try_clone().unwrap())
            .read_line(&mut request)
            .unwrap();
        assert!(!request.trim().is_empty());
        stream
                .write_all(b"{\"type\":\"task_control\",\"process\":\"vp\",\"task\":\"task\",\"cancel_requested\":false,\"abort_requested\":true}\n")
                .unwrap();
    });
    let mut runner = CoordinatorControlledProcessRunner {
        args: Args {
            coordinator,
            tenant: "tenant".to_owned(),
            project: "project".to_owned(),
            project_root: None,
            node: "node".to_owned(),
            enrollment_grant: None,
            public_key: None,
            control_poll_ms: 0,
            assignment_poll_ms: 1,
            emit_ready: false,
            worker: true,
        },
        process: "vp".to_owned(),
        task: "task".to_owned(),
        node_private_key: clusterflux_core::derive_ed25519_private_key_from_seed(
            "controlled-runner-test",
        ),
        debug_control: Arc::new(WasmDebugControl::default()),
        command_status: Arc::new(Mutex::new(None)),
        timeout: Duration::from_secs(30),
    };
    let started = Instant::now();
    let error = runner
        .run(&PodmanCommand {
            program: "sh".to_owned(),
            args: vec!["-c".to_owned(), "sleep 30 & wait".to_owned()],
        })
        .unwrap_err();
    server.join().unwrap();

    assert!(matches!(error, BackendError::Cancelled(_)));
    assert!(started.elapsed() < Duration::from_secs(5));
}

#[cfg(unix)]
#[test]
fn command_timeout_is_bounded_and_a_later_command_still_runs() {
    let (coordinator, server) = start_running_control_server();
    let mut runner = test_controlled_runner(coordinator, Duration::from_millis(120));
    let started = Instant::now();
    let error = runner
        .run(&PodmanCommand {
            program: "sh".to_owned(),
            args: vec!["-c".to_owned(), "sleep 30 & wait".to_owned()],
        })
        .unwrap_err();
    assert!(error.to_string().contains("timeout"));
    assert!(started.elapsed() < Duration::from_secs(5));
    drop(runner);
    server.join().unwrap();

    let (coordinator, server) = start_running_control_server();
    let mut runner = test_controlled_runner(coordinator, Duration::from_secs(5));
    let output = runner
        .run(&PodmanCommand {
            program: "sh".to_owned(),
            args: vec!["-c".to_owned(), "printf healthy".to_owned()],
        })
        .unwrap();
    assert_eq!(output.status_code, Some(0));
    assert_eq!(String::from_utf8(output.stdout).unwrap(), "healthy");
    drop(runner);
    server.join().unwrap();
}

#[test]
fn command_source_verification_rejects_a_changed_checkout() {
    let checkout = tempfile::tempdir().unwrap();
    std::fs::write(checkout.path().join("source.c"), "int value = 1;\n").unwrap();
    let expected = snapshot_project(checkout.path()).unwrap().digest;
    verify_source_snapshot(checkout.path(), &expected).unwrap();

    std::fs::write(checkout.path().join("source.c"), "int value = 2;\n").unwrap();
    let error = verify_source_snapshot(checkout.path(), &expected).unwrap_err();

    assert!(error.contains("source snapshot mismatch"));
    assert!(error.contains(expected.as_str()));
}

#[test]
fn command_environment_verification_rejects_a_changed_recipe() {
    let checkout = tempfile::tempdir().unwrap();
    let environment = checkout.path().join("envs/linux");
    std::fs::create_dir_all(&environment).unwrap();
    std::fs::write(
        environment.join("Containerfile"),
        "FROM docker.io/library/alpine:3.20\n",
    )
    .unwrap();
    let expected = clusterflux_core::discover_environments(checkout.path())
        .unwrap()
        .into_iter()
        .find(|environment| environment.name == "linux")
        .unwrap()
        .digest;
    verify_environment_digest(checkout.path(), "linux", &expected).unwrap();

    std::fs::write(
        environment.join("Containerfile"),
        "FROM docker.io/library/alpine:3.21\n",
    )
    .unwrap();
    let error = verify_environment_digest(checkout.path(), "linux", &expected).unwrap_err();

    assert!(error.contains("does not match the bundle"));
    assert!(error.contains(expected.as_str()));
}

#[test]
fn configured_secret_values_are_redacted_before_guest_or_coordinator_logging() {
    assert!(is_secret_environment_name("API_TOKEN"));
    assert!(is_secret_environment_name("database_password"));
    assert!(!is_secret_environment_name("SOURCE_DATE_EPOCH"));
    assert_eq!(
        redact_configured_values(
            "token=correct-horse and again correct-horse".to_owned(),
            &["correct-horse".to_owned()],
        ),
        "token=[REDACTED] and again [REDACTED]"
    );
}

#[test]
fn native_command_requires_environment_and_network_grant() {
    let error = require_command_environment(None).unwrap_err();
    assert!(error.contains("explicit command-capable environment"));
    assert_eq!(require_command_environment(Some("linux")).unwrap(), "linux");

    authorize_command_network(&clusterflux_core::CommandNetworkPolicy::Disabled, false).unwrap();
    let error = authorize_command_network(&clusterflux_core::CommandNetworkPolicy::Enabled, false)
        .unwrap_err();
    assert!(error.contains("Network capability"));
}