//! Unit tests for the local model-server ensure use case.

use std::collections::{HashMap, VecDeque};
use std::sync::{Arc, Mutex};
use std::time::Duration;

use async_trait::async_trait;

use application::{
    DeleteModelServer, DeleteModelServerInput, EnsureLocalModelServer, EnsureLocalModelServerInput,
    ModelServerReadinessPolicy,
};
use domain::events::DomainEvent;
use domain::model_server::{
    ExecutablePath, HfModelRef, LlamaCppOptions, LocalModelRef, LocalModelServerConfig,
    LocalModelServerKind, ModelPath, ModelServerEndpoint, ModelServerLifecycleStatus,
    ModelServerStatus, ModelSource, StopPolicy,
};
use domain::ports::{
    DirEntry, EventBus, EventStream, FileSystem, FsError, ManagedProcess, ManagedProcessHandle,
    ModelArtifactCancel, ModelArtifactDownloader, ModelArtifactProgress, ModelArtifactResolution,
    ModelServerArgv, ModelServerError, ModelServerProbe, ModelServerRegistry, ModelServerRuntime,
    ProcessStatus, ProfileStore, RemotePath, SpawnSpec, StoreError,
};
use domain::profile::{AgentProfile, ContextInjection, OpenCodeConfig, StructuredAdapter};
use domain::{LocalModelServerId, ProfileId, ProjectPath};

fn sid(n: u128) -> LocalModelServerId {
    LocalModelServerId::from_uuid(uuid::Uuid::from_u128(n))
}

fn config(
    id: LocalModelServerId,
    port: u16,
    path: &str,
    auto_start: bool,
) -> LocalModelServerConfig {
    LocalModelServerConfig::new(
        id,
        LocalModelServerKind::LlamaCpp,
        "llama.cpp",
        ModelServerEndpoint::new(format!("http://localhost:{port}"), port).unwrap(),
        LocalModelRef::new(
            "qwen",
            "Qwen",
            Some(ModelSource::LocalPath {
                path: ModelPath::new(path).unwrap(),
            }),
            "qwen3-coder-30b",
        )
        .unwrap(),
        Some(ExecutablePath::new("llama-server").unwrap()),
        LlamaCppOptions::default(),
        Vec::new(),
        auto_start,
        StopPolicy::StopOnAppExit,
    )
    .unwrap()
}

fn hf_config(id: LocalModelServerId, port: u16, repo: &str) -> LocalModelServerConfig {
    LocalModelServerConfig::new(
        id,
        LocalModelServerKind::LlamaCpp,
        "llama.cpp",
        ModelServerEndpoint::new(format!("http://localhost:{port}"), port).unwrap(),
        LocalModelRef::new(
            "qwen",
            "Qwen",
            Some(ModelSource::HuggingFace {
                repo: HfModelRef::new(repo).unwrap(),
            }),
            "qwen3-coder-30b",
        )
        .unwrap(),
        Some(ExecutablePath::new("llama-server").unwrap()),
        LlamaCppOptions::default(),
        Vec::new(),
        true,
        StopPolicy::StopOnAppExit,
    )
    .unwrap()
}

#[derive(Default)]
struct FakeRegistry(Mutex<HashMap<LocalModelServerId, LocalModelServerConfig>>);

#[async_trait]
impl ModelServerRegistry for FakeRegistry {
    async fn get(
        &self,
        id: &LocalModelServerId,
    ) -> Result<Option<LocalModelServerConfig>, ModelServerError> {
        Ok(self.0.lock().unwrap().get(id).cloned())
    }

    async fn list(&self) -> Result<Vec<LocalModelServerConfig>, ModelServerError> {
        Ok(self.0.lock().unwrap().values().cloned().collect())
    }

    async fn save(&self, config: LocalModelServerConfig) -> Result<(), ModelServerError> {
        self.0.lock().unwrap().insert(config.id, config);
        Ok(())
    }

    async fn delete(&self, id: LocalModelServerId) -> Result<(), ModelServerError> {
        self.0.lock().unwrap().remove(&id);
        Ok(())
    }
}

#[derive(Default)]
struct FakeProfiles(Mutex<Vec<AgentProfile>>);

#[async_trait]
impl ProfileStore for FakeProfiles {
    async fn list(&self) -> Result<Vec<AgentProfile>, StoreError> {
        Ok(self.0.lock().unwrap().clone())
    }

    async fn save(&self, profile: &AgentProfile) -> Result<(), StoreError> {
        self.0.lock().unwrap().push(profile.clone());
        Ok(())
    }

    async fn delete(&self, _id: ProfileId) -> Result<(), StoreError> {
        Ok(())
    }

    async fn is_configured(&self) -> Result<bool, StoreError> {
        Ok(true)
    }

    async fn mark_configured(&self) -> Result<(), StoreError> {
        Ok(())
    }
}

fn opencode_profile(id: u128, server_id: LocalModelServerId) -> AgentProfile {
    AgentProfile::new(
        ProfileId::from_uuid(uuid::Uuid::from_u128(id)),
        "Local OpenCode",
        "opencode",
        Vec::new(),
        ContextInjection::stdin(),
        None,
        "{projectRoot}",
        None,
    )
    .unwrap()
    .with_structured_adapter(StructuredAdapter::OpenCode)
    .with_opencode(
        OpenCodeConfig::new("http://localhost:8080/v1", None, "qwen", None, None)
            .unwrap()
            .with_local_model_server_id(server_id),
    )
}

struct FakeProbe(Mutex<VecDeque<ModelServerStatus>>);

impl FakeProbe {
    fn new(statuses: Vec<ModelServerStatus>) -> Self {
        Self(Mutex::new(statuses.into()))
    }
}

#[async_trait]
impl ModelServerProbe for FakeProbe {
    async fn probe(
        &self,
        _endpoint: &ModelServerEndpoint,
    ) -> Result<ModelServerStatus, ModelServerError> {
        Ok(self
            .0
            .lock()
            .unwrap()
            .pop_front()
            .unwrap_or(ModelServerStatus::Unreachable))
    }
}

#[derive(Default)]
struct FakeProcess {
    spawns: Mutex<Vec<SpawnSpec>>,
    kills: Mutex<Vec<String>>,
    statuses: Mutex<HashMap<String, ProcessStatus>>,
    status_sequence: Mutex<VecDeque<ProcessStatus>>,
    spawn_delay: Duration,
}

#[async_trait]
impl ManagedProcess for FakeProcess {
    async fn spawn(&self, spec: SpawnSpec) -> Result<ManagedProcessHandle, ModelServerError> {
        if !self.spawn_delay.is_zero() {
            tokio::time::sleep(self.spawn_delay).await;
        }
        self.spawns.lock().unwrap().push(spec);
        let handle = ManagedProcessHandle {
            id: format!("h{}", self.spawns.lock().unwrap().len()),
        };
        self.statuses
            .lock()
            .unwrap()
            .insert(handle.id.clone(), ProcessStatus::Running);
        Ok(handle)
    }

    async fn kill(&self, handle: &ManagedProcessHandle) -> Result<(), ModelServerError> {
        self.kills.lock().unwrap().push(handle.id.clone());
        Ok(())
    }

    async fn status(
        &self,
        handle: &ManagedProcessHandle,
    ) -> Result<ProcessStatus, ModelServerError> {
        if let Some(status) = self.status_sequence.lock().unwrap().pop_front() {
            return Ok(status);
        }
        Ok(*self
            .statuses
            .lock()
            .unwrap()
            .get(&handle.id)
            .unwrap_or(&ProcessStatus::Unknown))
    }
}

struct FakeRuntime;

impl ModelServerRuntime for FakeRuntime {
    fn build_argv(
        &self,
        config: &LocalModelServerConfig,
    ) -> Result<ModelServerArgv, ModelServerError> {
        let mut args = Vec::new();
        match config
            .model
            .source
            .as_ref()
            .ok_or_else(|| ModelServerError::PathNotAccessible("model.source missing".to_owned()))?
        {
            ModelSource::LocalPath { path } => {
                args.push("--model".to_owned());
                args.push(path.as_str().to_owned());
            }
            ModelSource::HuggingFace { repo } => {
                args.push("-hf".to_owned());
                args.push(repo.as_str().to_owned());
            }
        }
        args.extend([
            "--port".to_owned(),
            config.endpoint.port.to_string(),
            "--host".to_owned(),
            config.options.host.clone(),
        ]);
        Ok(ModelServerArgv {
            command: config
                .binary
                .as_ref()
                .map(|binary| binary.as_str().to_owned())
                .unwrap_or_else(|| "llama-server".to_owned()),
            args,
        })
    }

    fn build_spawn_spec(
        &self,
        config: &LocalModelServerConfig,
    ) -> Result<SpawnSpec, ModelServerError> {
        let argv = self.build_argv(config)?;
        Ok(SpawnSpec {
            command: argv.command,
            args: argv.args,
            cwd: ProjectPath::new("/").unwrap(),
            env: Vec::new(),
            context_plan: None,
            sandbox: None,
        })
    }
}

#[derive(Clone)]
enum FakeDownloadOutcome {
    Resolve {
        progress: Vec<ModelArtifactProgress>,
        path: &'static str,
        cache_hit: bool,
    },
    WaitForCancel,
    Sleep(Duration),
}

struct FakeModelArtifactDownloader {
    outcome: Mutex<FakeDownloadOutcome>,
}

impl FakeModelArtifactDownloader {
    fn new(outcome: FakeDownloadOutcome) -> Self {
        Self {
            outcome: Mutex::new(outcome),
        }
    }
}

#[async_trait]
impl ModelArtifactDownloader for FakeModelArtifactDownloader {
    async fn resolve_hf_model(
        &self,
        repo: &HfModelRef,
        progress: Arc<dyn Fn(ModelArtifactProgress) + Send + Sync>,
        cancel: ModelArtifactCancel,
    ) -> Result<ModelArtifactResolution, ModelServerError> {
        let outcome = self.outcome.lock().unwrap().clone();
        match outcome {
            FakeDownloadOutcome::Resolve {
                progress: events,
                path,
                cache_hit,
            } => {
                if cancel.is_cancelled() {
                    return Err(ModelServerError::Cancelled);
                }
                if !cache_hit {
                    for event in events {
                        progress(ModelArtifactProgress {
                            source: event.source.or_else(|| Some(repo.as_str().to_owned())),
                            ..event
                        });
                    }
                }
                Ok(ModelArtifactResolution {
                    path: ModelPath::new(path).unwrap(),
                    cache_hit,
                })
            }
            FakeDownloadOutcome::WaitForCancel => loop {
                if cancel.is_cancelled() {
                    return Err(ModelServerError::Cancelled);
                }
                tokio::time::sleep(Duration::from_millis(1)).await;
            },
            FakeDownloadOutcome::Sleep(duration) => {
                tokio::time::sleep(duration).await;
                Err(ModelServerError::Probe("unexpected wake".to_owned()))
            }
        }
    }
}

#[derive(Default)]
struct FakeFs {
    existing: Mutex<Vec<String>>,
}

#[async_trait]
impl FileSystem for FakeFs {
    async fn read(&self, _path: &RemotePath) -> Result<Vec<u8>, FsError> {
        Err(FsError::NotFound("unused".to_owned()))
    }

    async fn write(&self, _path: &RemotePath, _data: &[u8]) -> Result<(), FsError> {
        Ok(())
    }

    async fn exists(&self, path: &RemotePath) -> Result<bool, FsError> {
        Ok(self
            .existing
            .lock()
            .unwrap()
            .iter()
            .any(|p| p == path.as_str()))
    }

    async fn create_dir_all(&self, _path: &RemotePath) -> Result<(), FsError> {
        Ok(())
    }

    async fn list(&self, _path: &RemotePath) -> Result<Vec<DirEntry>, FsError> {
        Ok(Vec::new())
    }

    async fn symlink(&self, _src: &RemotePath, _dst: &RemotePath) -> Result<(), FsError> {
        Ok(())
    }
}

#[derive(Default)]
struct FakeEvents(Mutex<Vec<DomainEvent>>);

impl EventBus for FakeEvents {
    fn publish(&self, event: DomainEvent) {
        self.0.lock().unwrap().push(event);
    }

    fn subscribe(&self) -> EventStream {
        Box::new(std::iter::empty())
    }
}

fn ensure(
    registry: Arc<FakeRegistry>,
    probe: Arc<FakeProbe>,
    process: Arc<FakeProcess>,
    fs: Arc<FakeFs>,
    events: Arc<FakeEvents>,
) -> EnsureLocalModelServer {
    EnsureLocalModelServer::new(registry, probe, process, Arc::new(FakeRuntime), fs, events)
        .with_readiness_policy(ModelServerReadinessPolicy {
            attempts: 2,
            backoff: Duration::ZERO,
        })
        .with_hf_download_deadline(Duration::from_secs(5))
}

fn ensure_with_downloader(
    registry: Arc<FakeRegistry>,
    probe: Arc<FakeProbe>,
    process: Arc<FakeProcess>,
    fs: Arc<FakeFs>,
    events: Arc<FakeEvents>,
    downloader: Arc<FakeModelArtifactDownloader>,
) -> EnsureLocalModelServer {
    ensure(registry, probe, process, fs, events)
        .with_model_artifact_downloader(downloader as Arc<dyn ModelArtifactDownloader>)
}

fn progress(downloaded: Option<u64>, total: Option<u64>) -> ModelArtifactProgress {
    ModelArtifactProgress {
        downloaded_bytes: downloaded,
        total_bytes: total,
        source: None,
    }
}

#[tokio::test]
async fn reachable_server_is_reused_without_spawn() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(config(sid(1), 8080, "/models/qwen.gguf", true))
        .await
        .unwrap();
    let process = Arc::new(FakeProcess::default());
    let usecase = ensure(
        Arc::clone(&registry),
        Arc::new(FakeProbe::new(vec![ModelServerStatus::ReadyReused])),
        Arc::clone(&process),
        Arc::new(FakeFs::default()),
        Arc::new(FakeEvents::default()),
    );

    let out = usecase
        .execute(EnsureLocalModelServerInput { server_id: sid(1) })
        .await
        .unwrap();

    assert_eq!(out.ready.base_url, "http://localhost:8080/v1");
    assert_eq!(out.ready.model, "qwen3-coder-30b");
    assert!(process.spawns.lock().unwrap().is_empty());
}

#[tokio::test]
async fn absent_auto_start_spawns_and_waits_until_ready() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(config(sid(2), 8081, "/models/qwen.gguf", true))
        .await
        .unwrap();
    let fs = Arc::new(FakeFs::default());
    fs.existing
        .lock()
        .unwrap()
        .push("/models/qwen.gguf".to_owned());
    let process = Arc::new(FakeProcess::default());
    let usecase = ensure(
        Arc::clone(&registry),
        Arc::new(FakeProbe::new(vec![
            ModelServerStatus::Unreachable,
            ModelServerStatus::ReadyReused,
        ])),
        Arc::clone(&process),
        fs,
        Arc::new(FakeEvents::default()),
    );

    let out = usecase
        .execute(EnsureLocalModelServerInput { server_id: sid(2) })
        .await
        .unwrap();

    assert_eq!(out.ready.status, ModelServerStatus::ReadyStarted);
    let spawns = process.spawns.lock().unwrap();
    assert_eq!(spawns.len(), 1);
    assert_eq!(spawns[0].command, "llama-server");
    assert_eq!(
        spawns[0].args,
        vec![
            "--model",
            "/models/qwen.gguf",
            "--port",
            "8081",
            "--host",
            "127.0.0.1"
        ]
    );
}

#[tokio::test]
async fn concurrent_ensure_same_server_shares_one_start_attempt() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(config(sid(10), 8090, "/models/qwen.gguf", true))
        .await
        .unwrap();
    let fs = Arc::new(FakeFs::default());
    fs.existing
        .lock()
        .unwrap()
        .push("/models/qwen.gguf".to_owned());
    let process = Arc::new(FakeProcess {
        spawn_delay: Duration::from_millis(25),
        ..FakeProcess::default()
    });
    let events = Arc::new(FakeEvents::default());
    let usecase = Arc::new(ensure(
        Arc::clone(&registry),
        Arc::new(FakeProbe::new(vec![
            ModelServerStatus::Unreachable,
            ModelServerStatus::ReadyReused,
        ])),
        Arc::clone(&process),
        fs,
        Arc::clone(&events),
    ));

    let mut tasks = Vec::new();
    for _ in 0..5 {
        let usecase = Arc::clone(&usecase);
        tasks.push(tokio::spawn(async move {
            usecase
                .execute(EnsureLocalModelServerInput { server_id: sid(10) })
                .await
                .unwrap()
        }));
    }

    let mut outputs = Vec::new();
    for task in tasks {
        outputs.push(task.await.unwrap());
    }

    assert!(outputs
        .iter()
        .all(|out| out.ready.status == ModelServerStatus::ReadyStarted));
    assert_eq!(process.spawns.lock().unwrap().len(), 1);

    let starting_events = events
        .0
        .lock()
        .unwrap()
        .iter()
        .filter(|event| {
            matches!(
                event,
                DomainEvent::ModelServerStatusChanged {
                    status: domain::model_server::ModelServerLifecycleStatus::Starting,
                    ..
                }
            )
        })
        .count();
    assert_eq!(starting_events, 1);
}

#[tokio::test]
async fn missing_model_path_is_path_not_accessible() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(config(sid(3), 8082, "/models/missing.gguf", true))
        .await
        .unwrap();
    let usecase = ensure(
        Arc::clone(&registry),
        Arc::new(FakeProbe::new(vec![ModelServerStatus::Unreachable])),
        Arc::new(FakeProcess::default()),
        Arc::new(FakeFs::default()),
        Arc::new(FakeEvents::default()),
    );

    let err = usecase
        .execute(EnsureLocalModelServerInput { server_id: sid(3) })
        .await
        .unwrap_err();

    assert_eq!(err.code(), "MODEL_SERVER");
    assert!(err.to_string().contains("path_not_accessible"));
}

#[tokio::test]
async fn active_managed_port_collision_is_explicit_error() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(config(sid(4), 8083, "/models/a.gguf", true))
        .await
        .unwrap();
    registry
        .save(config(sid(5), 8083, "/models/b.gguf", true))
        .await
        .unwrap();
    let fs = Arc::new(FakeFs::default());
    fs.existing
        .lock()
        .unwrap()
        .extend(["/models/a.gguf".to_owned(), "/models/b.gguf".to_owned()]);
    let process = Arc::new(FakeProcess::default());
    let events = Arc::new(FakeEvents::default());
    let usecase = ensure(
        Arc::clone(&registry),
        Arc::new(FakeProbe::new(vec![
            ModelServerStatus::Unreachable,
            ModelServerStatus::ReadyReused,
            ModelServerStatus::Unreachable,
        ])),
        Arc::clone(&process),
        fs,
        events,
    );

    usecase
        .execute(EnsureLocalModelServerInput { server_id: sid(4) })
        .await
        .unwrap();
    let err = usecase
        .execute(EnsureLocalModelServerInput { server_id: sid(5) })
        .await
        .unwrap_err();

    assert!(err.to_string().contains("port_occupied"));
    assert_eq!(process.spawns.lock().unwrap().len(), 1);
}

#[tokio::test]
async fn readiness_timeout_kills_started_process() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(config(sid(6), 8084, "/models/qwen.gguf", true))
        .await
        .unwrap();
    let fs = Arc::new(FakeFs::default());
    fs.existing
        .lock()
        .unwrap()
        .push("/models/qwen.gguf".to_owned());
    let process = Arc::new(FakeProcess::default());
    let usecase = ensure(
        Arc::clone(&registry),
        Arc::new(FakeProbe::new(vec![
            ModelServerStatus::Unreachable,
            ModelServerStatus::Unreachable,
            ModelServerStatus::Unreachable,
        ])),
        Arc::clone(&process),
        fs,
        Arc::new(FakeEvents::default()),
    );

    let err = usecase
        .execute(EnsureLocalModelServerInput { server_id: sid(6) })
        .await
        .unwrap_err();

    assert!(err.to_string().contains("timeout"));
    assert_eq!(process.spawns.lock().unwrap().len(), 1);
    assert_eq!(process.kills.lock().unwrap().as_slice(), ["h1"]);
}

#[tokio::test]
async fn hf_unreachable_alive_publishes_downloading_without_short_timeout_kill() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(hf_config(
            sid(11),
            8091,
            "Qwen/Qwen3-Coder-30B-A3B-Instruct-GGUF",
        ))
        .await
        .unwrap();
    let process = Arc::new(FakeProcess::default());
    let events = Arc::new(FakeEvents::default());
    let usecase = ensure(
        Arc::clone(&registry),
        Arc::new(FakeProbe::new(vec![
            ModelServerStatus::Unreachable,
            ModelServerStatus::Unreachable,
            ModelServerStatus::Unreachable,
            ModelServerStatus::ReadyReused,
        ])),
        Arc::clone(&process),
        Arc::new(FakeFs::default()),
        Arc::clone(&events),
    );

    let out = usecase
        .execute(EnsureLocalModelServerInput { server_id: sid(11) })
        .await
        .unwrap();

    assert_eq!(out.ready.status, ModelServerStatus::ReadyStarted);
    assert!(process.kills.lock().unwrap().is_empty());
    assert!(events.0.lock().unwrap().iter().any(|event| {
        matches!(
            event,
            DomainEvent::ModelServerStatusChanged {
                server_id,
                status: ModelServerLifecycleStatus::Downloading {
                    downloaded_bytes: None,
                    total_bytes: None,
                    percent: None,
                    source: Some(source),
                },
            } if *server_id == sid(11)
                && source == "Qwen/Qwen3-Coder-30B-A3B-Instruct-GGUF"
        )
    }));
}

#[tokio::test]
async fn hf_download_phase_reports_ready_when_probe_becomes_ok() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(hf_config(
            sid(12),
            8092,
            "Qwen/Qwen3-Coder-30B-A3B-Instruct-GGUF",
        ))
        .await
        .unwrap();
    let process = Arc::new(FakeProcess::default());
    let events = Arc::new(FakeEvents::default());
    let usecase = ensure(
        Arc::clone(&registry),
        Arc::new(FakeProbe::new(vec![
            ModelServerStatus::Unreachable,
            ModelServerStatus::Unreachable,
            ModelServerStatus::Unreachable,
            ModelServerStatus::ReadyStarted,
        ])),
        Arc::clone(&process),
        Arc::new(FakeFs::default()),
        Arc::clone(&events),
    );

    let out = usecase
        .execute(EnsureLocalModelServerInput { server_id: sid(12) })
        .await
        .unwrap();

    assert_eq!(out.ready.status, ModelServerStatus::ReadyStarted);
    let statuses: Vec<ModelServerLifecycleStatus> = events
        .0
        .lock()
        .unwrap()
        .iter()
        .filter_map(|event| match event {
            DomainEvent::ModelServerStatusChanged { status, .. } => Some(status.clone()),
            _ => None,
        })
        .collect();
    assert!(matches!(
        statuses.as_slice(),
        [
            ModelServerLifecycleStatus::Probing,
            ModelServerLifecycleStatus::Starting,
            ModelServerLifecycleStatus::Downloading { .. },
            ModelServerLifecycleStatus::Ready { reused: false },
        ]
    ));
}

#[tokio::test]
async fn hf_download_phase_fails_when_process_exits() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(hf_config(
            sid(13),
            8093,
            "Qwen/Qwen3-Coder-30B-A3B-Instruct-GGUF",
        ))
        .await
        .unwrap();
    let process = Arc::new(FakeProcess::default());
    process
        .status_sequence
        .lock()
        .unwrap()
        .push_back(ProcessStatus::Exited { code: Some(42) });
    let events = Arc::new(FakeEvents::default());
    let usecase = ensure(
        Arc::clone(&registry),
        Arc::new(FakeProbe::new(vec![
            ModelServerStatus::Unreachable,
            ModelServerStatus::Unreachable,
            ModelServerStatus::Unreachable,
        ])),
        Arc::clone(&process),
        Arc::new(FakeFs::default()),
        Arc::clone(&events),
    );

    let err = usecase
        .execute(EnsureLocalModelServerInput { server_id: sid(13) })
        .await
        .unwrap_err();

    assert!(err.to_string().contains("process"));
    assert!(err.to_string().contains("42"));
    assert!(process.kills.lock().unwrap().is_empty());
    assert!(events.0.lock().unwrap().iter().any(|event| {
        matches!(
            event,
            DomainEvent::ModelServerStatusChanged {
                status: ModelServerLifecycleStatus::Failed { code, .. },
                ..
            } if code == "process"
        )
    }));
}

#[tokio::test]
async fn hf_downloader_publishes_debounced_progress_and_spawns_resolved_model_path() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(hf_config(
            sid(14),
            8094,
            "Qwen/Qwen3-Coder-30B-A3B-Instruct-GGUF",
        ))
        .await
        .unwrap();
    let process = Arc::new(FakeProcess::default());
    let events = Arc::new(FakeEvents::default());
    let downloader = Arc::new(FakeModelArtifactDownloader::new(
        FakeDownloadOutcome::Resolve {
            progress: vec![
                progress(Some(10), Some(100)),
                progress(Some(50), Some(100)),
                progress(Some(100), Some(100)),
            ],
            path: "/cache/model.gguf",
            cache_hit: false,
        },
    ));
    let usecase = ensure_with_downloader(
        Arc::clone(&registry),
        Arc::new(FakeProbe::new(vec![
            ModelServerStatus::Unreachable,
            ModelServerStatus::ReadyStarted,
        ])),
        Arc::clone(&process),
        Arc::new(FakeFs::default()),
        Arc::clone(&events),
        downloader,
    );

    let out = usecase
        .execute(EnsureLocalModelServerInput { server_id: sid(14) })
        .await
        .unwrap();

    assert_eq!(out.ready.status, ModelServerStatus::ReadyStarted);
    let statuses: Vec<ModelServerLifecycleStatus> = events
        .0
        .lock()
        .unwrap()
        .iter()
        .filter_map(|event| match event {
            DomainEvent::ModelServerStatusChanged { status, .. } => Some(status.clone()),
            _ => None,
        })
        .collect();
    assert!(matches!(
        statuses.as_slice(),
        [
            ModelServerLifecycleStatus::Probing,
            ModelServerLifecycleStatus::Downloading {
                downloaded_bytes: Some(10),
                total_bytes: Some(100),
                percent: Some(10.0),
                ..
            },
            ModelServerLifecycleStatus::Downloading {
                downloaded_bytes: Some(100),
                total_bytes: Some(100),
                percent: Some(100.0),
                ..
            },
            ModelServerLifecycleStatus::Starting,
            ModelServerLifecycleStatus::Ready { reused: false },
        ]
    ));
    let spawns = process.spawns.lock().unwrap();
    assert_eq!(spawns.len(), 1);
    assert_eq!(spawns[0].args[0..2], ["--model", "/cache/model.gguf"]);
    assert!(!spawns[0].args.iter().any(|arg| arg == "-hf"));
}

#[tokio::test]
async fn hf_downloader_cache_hit_skips_downloading_events() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(hf_config(sid(15), 8095, "Qwen/Qwen3-Coder:Q4_K_M"))
        .await
        .unwrap();
    let process = Arc::new(FakeProcess::default());
    let events = Arc::new(FakeEvents::default());
    let downloader = Arc::new(FakeModelArtifactDownloader::new(
        FakeDownloadOutcome::Resolve {
            progress: Vec::new(),
            path: "/cache/q4.gguf",
            cache_hit: true,
        },
    ));
    let usecase = ensure_with_downloader(
        Arc::clone(&registry),
        Arc::new(FakeProbe::new(vec![
            ModelServerStatus::Unreachable,
            ModelServerStatus::ReadyStarted,
        ])),
        Arc::clone(&process),
        Arc::new(FakeFs::default()),
        Arc::clone(&events),
        downloader,
    );

    usecase
        .execute(EnsureLocalModelServerInput { server_id: sid(15) })
        .await
        .unwrap();

    let statuses: Vec<ModelServerLifecycleStatus> = events
        .0
        .lock()
        .unwrap()
        .iter()
        .filter_map(|event| match event {
            DomainEvent::ModelServerStatusChanged { status, .. } => Some(status.clone()),
            _ => None,
        })
        .collect();
    assert!(matches!(
        statuses.as_slice(),
        [
            ModelServerLifecycleStatus::Probing,
            ModelServerLifecycleStatus::Starting,
            ModelServerLifecycleStatus::Ready { reused: false },
        ]
    ));
}

#[tokio::test]
async fn hf_downloader_unknown_total_publishes_no_percent() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(hf_config(sid(16), 8096, "Qwen/Qwen3-Coder:Q4_K_M"))
        .await
        .unwrap();
    let process = Arc::new(FakeProcess::default());
    let events = Arc::new(FakeEvents::default());
    let downloader = Arc::new(FakeModelArtifactDownloader::new(
        FakeDownloadOutcome::Resolve {
            progress: vec![progress(Some(10), None)],
            path: "/cache/q4.gguf",
            cache_hit: false,
        },
    ));
    let usecase = ensure_with_downloader(
        Arc::clone(&registry),
        Arc::new(FakeProbe::new(vec![
            ModelServerStatus::Unreachable,
            ModelServerStatus::ReadyStarted,
        ])),
        Arc::clone(&process),
        Arc::new(FakeFs::default()),
        Arc::clone(&events),
        downloader,
    );

    usecase
        .execute(EnsureLocalModelServerInput { server_id: sid(16) })
        .await
        .unwrap();

    assert!(events.0.lock().unwrap().iter().any(|event| {
        matches!(
            event,
            DomainEvent::ModelServerStatusChanged {
                status: ModelServerLifecycleStatus::Downloading {
                    downloaded_bytes: Some(10),
                    total_bytes: None,
                    percent: None,
                    ..
                },
                ..
            }
        )
    }));
}

#[tokio::test]
async fn hf_downloader_cancel_fails_without_process_spawn() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(hf_config(sid(17), 8097, "Qwen/Qwen3-Coder:Q4_K_M"))
        .await
        .unwrap();
    let process = Arc::new(FakeProcess::default());
    let events = Arc::new(FakeEvents::default());
    let downloader = Arc::new(FakeModelArtifactDownloader::new(
        FakeDownloadOutcome::WaitForCancel,
    ));
    let usecase = Arc::new(ensure_with_downloader(
        Arc::clone(&registry),
        Arc::new(FakeProbe::new(vec![ModelServerStatus::Unreachable])),
        Arc::clone(&process),
        Arc::new(FakeFs::default()),
        Arc::clone(&events),
        downloader,
    ));
    let task_usecase = Arc::clone(&usecase);
    let task = tokio::spawn(async move {
        task_usecase
            .execute(EnsureLocalModelServerInput { server_id: sid(17) })
            .await
    });
    tokio::time::sleep(Duration::from_millis(5)).await;

    usecase.stop_on_app_exit().await.unwrap();
    let err = task.await.unwrap().unwrap_err();

    assert!(err.to_string().contains("cancelled"));
    assert!(process.spawns.lock().unwrap().is_empty());
    assert!(events.0.lock().unwrap().iter().any(|event| {
        matches!(
            event,
            DomainEvent::ModelServerStatusChanged {
                status: ModelServerLifecycleStatus::Failed { code, .. },
                ..
            } if code == "cancelled"
        )
    }));
}

#[tokio::test]
async fn hf_downloader_timeout_fails_without_process_spawn() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(hf_config(sid(18), 8098, "Qwen/Qwen3-Coder:Q4_K_M"))
        .await
        .unwrap();
    let process = Arc::new(FakeProcess::default());
    let events = Arc::new(FakeEvents::default());
    let downloader = Arc::new(FakeModelArtifactDownloader::new(
        FakeDownloadOutcome::Sleep(Duration::from_millis(50)),
    ));
    let usecase = ensure_with_downloader(
        Arc::clone(&registry),
        Arc::new(FakeProbe::new(vec![ModelServerStatus::Unreachable])),
        Arc::clone(&process),
        Arc::new(FakeFs::default()),
        Arc::clone(&events),
        downloader,
    )
    .with_hf_download_deadline(Duration::from_millis(1));

    let err = usecase
        .execute(EnsureLocalModelServerInput { server_id: sid(18) })
        .await
        .unwrap_err();

    assert!(err.to_string().contains("timeout"));
    assert!(process.spawns.lock().unwrap().is_empty());
    assert!(events.0.lock().unwrap().iter().any(|event| {
        matches!(
            event,
            DomainEvent::ModelServerStatusChanged {
                status: ModelServerLifecycleStatus::Failed { code, .. },
                ..
            } if code == "timeout"
        )
    }));
}

#[tokio::test]
async fn missing_registry_entry_is_model_server_not_configured() {
    let usecase = ensure(
        Arc::new(FakeRegistry::default()),
        Arc::new(FakeProbe::new(Vec::new())),
        Arc::new(FakeProcess::default()),
        Arc::new(FakeFs::default()),
        Arc::new(FakeEvents::default()),
    );

    let err = usecase
        .execute(EnsureLocalModelServerInput { server_id: sid(7) })
        .await
        .unwrap_err();

    assert_eq!(err.code(), "MODEL_SERVER");
    assert!(err.to_string().contains("not_configured"));
}

#[tokio::test]
async fn delete_model_server_refuses_when_profile_references_it() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(config(sid(8), 8085, "/models/qwen.gguf", false))
        .await
        .unwrap();
    let profiles = Arc::new(FakeProfiles(Mutex::new(vec![opencode_profile(18, sid(8))])));
    let usecase = DeleteModelServer::new(registry, profiles);

    let err = usecase
        .execute(DeleteModelServerInput { server_id: sid(8) })
        .await
        .unwrap_err();

    assert_eq!(err.code(), "MODEL_SERVER");
    match err {
        application::AppError::ModelServer { code, .. } => {
            assert_eq!(code, "model_server_in_use");
        }
        other => panic!("unexpected error: {other}"),
    }
}

#[tokio::test]
async fn delete_model_server_removes_unused_config() {
    let registry = Arc::new(FakeRegistry::default());
    registry
        .save(config(sid(9), 8086, "/models/qwen.gguf", false))
        .await
        .unwrap();
    let profiles = Arc::new(FakeProfiles::default());
    let usecase = DeleteModelServer::new(
        Arc::clone(&registry) as Arc<dyn ModelServerRegistry>,
        profiles,
    );

    usecase
        .execute(DeleteModelServerInput { server_id: sid(9) })
        .await
        .unwrap();

    assert!(registry.get(&sid(9)).await.unwrap().is_none());
}