use super::*;
use crate::environment_selection::EnvironmentConfigOrigin;
use crate::environment_selection::TurnEnvironmentSnapshot;
use crate::exec_policy::AllowPrefixRules;
use crate::shell_snapshot::ShellSnapshotFile;
use crate::tools::sandboxing::executor_windows_sandbox_level;
use codex_core_plugins::PluginCommandAttribution;
use codex_core_plugins::ResolvedPluginMetricsOperation;
use codex_core_plugins::TrustedPluginRoots;
use codex_exec_server::ExecutorFileSystem;
use codex_file_system::FileSystemSandboxContext;
use codex_model_provider::SharedModelProvider;
use codex_protocol::SessionId;
use codex_protocol::ThreadId;
use codex_protocol::config_types::ShellEnvironmentPolicy;
use codex_protocol::models::AdditionalPermissionProfile;
use codex_protocol::openai_models::MODEL_SPECIALTY_CYBER;
use codex_protocol::openai_models::ModelInfo;
use codex_protocol::permissions::RawFileSystemSandboxPolicy;
use codex_protocol::protocol::EnvironmentConfig;
use codex_protocol::protocol::EnvironmentConfigState;
use codex_protocol::protocol::ErrorEvent;
use codex_protocol::protocol::MultiAgentVersion;
use codex_protocol::protocol::ThreadHistoryMode;
use codex_protocol::protocol::TurnEnvironmentSelection;
use codex_sandboxing::policy_transforms::effective_permission_profile;
use codex_skills_extension::HostSkillsSnapshot;
use codex_utils_path_uri::PathUri;
use futures::FutureExt;
use futures::future::BoxFuture;
use futures::future::Shared;
use std::sync::atomic::AtomicBool;
use std::sync::atomic::Ordering;
use tracing::instrument;

pub(crate) type ShellSnapshotTask = Shared<BoxFuture<'static, Option<Arc<ShellSnapshotFile>>>>;

#[derive(Clone)]
pub(crate) struct TurnEnvironment {
    pub(crate) selection: TurnEnvironmentSelection,
    pub(crate) config_origin: EnvironmentConfigOrigin,
    pub(crate) environment: Arc<Environment>,
    pub(crate) shell: Option<shell::Shell>,
    pub(crate) shell_snapshot: ShellSnapshotTask,
    pub(crate) shell_snapshot_v2_supported: bool,
}

impl TurnEnvironment {
    pub(crate) fn new(
        selection: TurnEnvironmentSelection,
        config_origin: EnvironmentConfigOrigin,
        environment: Arc<Environment>,
        shell: Option<shell::Shell>,
    ) -> Self {
        debug_assert!(matches!(selection.config, EnvironmentConfigState::Ready(_)));
        Self {
            selection,
            config_origin,
            environment,
            shell,
            shell_snapshot: futures::future::ready(None).boxed().shared(),
            shell_snapshot_v2_supported: false,
        }
    }

    pub(crate) fn config(&self) -> &EnvironmentConfig {
        let EnvironmentConfigState::Ready(config) = &self.selection.config else {
            unreachable!("ready turn environments always carry resolved configuration")
        };
        config
    }

    pub(crate) fn shell_environment_policy(&self) -> &ShellEnvironmentPolicy {
        &self.config().shell_environment_policy
    }

    #[cfg(test)]
    pub(crate) fn config_mut(&mut self) -> &mut EnvironmentConfig {
        let EnvironmentConfigState::Ready(config) = &mut self.selection.config else {
            unreachable!("ready turn environments always carry resolved configuration")
        };
        config
    }

    pub(crate) fn shell_snapshot(&self, cwd: &AbsolutePathBuf) -> Option<AbsolutePathBuf> {
        if self.selection.cwd != PathUri::from_abs_path(cwd) {
            return None;
        }
        self.shell_snapshot
            .peek()?
            .as_deref()
            .map(ShellSnapshotFile::path)
    }

    pub(crate) fn cwd(&self) -> &PathUri {
        &self.selection.cwd
    }

    pub(crate) fn workspace_roots(&self) -> &[PathUri] {
        &self.selection.workspace_roots
    }

    pub(crate) fn permission_profile(&self) -> &PermissionProfile {
        self.config().permission_profile.permission_profile()
    }

    /// Sandbox context for this environment, including any additional permission grants.
    pub(crate) fn sandbox_context(
        &self,
        additional_permissions: Option<AdditionalPermissionProfile>,
    ) -> FileSystemSandboxContext {
        let config = self.config();
        // Grant-adjusted permissions take precedence over the environment's baseline;
        // paths and sandbox backend settings remain environment-owned.
        let permissions = effective_permission_profile(
            self.permission_profile(),
            additional_permissions.as_ref(),
        );
        FileSystemSandboxContext {
            permissions: permissions.into(),
            cwd: Some(self.cwd().clone()),
            workspace_roots: self.workspace_roots().to_vec(),
            windows_sandbox_level: executor_windows_sandbox_level(
                config.windows_sandbox_level,
                self.cwd(),
            ),
            windows_sandbox_private_desktop: config.windows_sandbox_private_desktop,
            windows_sandbox_proxy_settings_mode: None,
            use_legacy_landlock: config.use_legacy_landlock,
        }
    }

    pub(crate) fn active_permission_profile(&self) -> Option<ActivePermissionProfile> {
        self.config().permission_profile.active_permission_profile()
    }

    pub(crate) fn permission_profile_with_workspace_roots(&self) -> PermissionProfile {
        let workspace_roots = self
            .workspace_roots()
            .iter()
            .filter_map(|workspace_root| workspace_root.to_abs_path().ok())
            .collect::<Vec<_>>();
        self.permission_profile()
            .clone()
            .materialize_project_roots_with_workspace_roots(&workspace_roots)
    }

    pub(crate) fn selection(&self) -> TurnEnvironmentSelection {
        self.config_origin
            .into_input_selection(self.selection.clone())
    }
}

impl std::fmt::Debug for TurnEnvironment {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("TurnEnvironment")
            .field("environment_id", &self.selection.environment_id)
            .field("environment", &self.environment)
            .field("cwd", &self.selection.cwd)
            .field("workspace_roots", &self.selection.workspace_roots)
            .field("shell", &self.shell)
            .field("config", self.config())
            .field("config_origin", &self.config_origin)
            .finish_non_exhaustive()
    }
}

/// The context needed for a single turn of the thread.
#[derive(Debug)]
pub struct TurnContext {
    pub(crate) sub_id: String,
    pub(crate) trace_id: Option<String>,
    pub(crate) realtime_active: bool,
    pub(crate) code_mode_available: bool,
    /// Turn-scoped configuration. Read step-specific settings such as service tier and
    /// approvals reviewer from the corresponding `StepContext` fields instead.
    pub config: Arc<Config>,
    pub(crate) auth_manager: Option<Arc<AuthManager>>,
    /// Legacy turn model; step-scoped execution should use `StepContext::model_info`.
    pub(crate) model_info: Arc<ModelInfo>,
    /// Turn-wide telemetry; model-attributed step work should use `StepContext::session_telemetry`.
    pub(crate) session_telemetry: SessionTelemetry,
    pub(crate) provider: SharedModelProvider,
    /// Legacy turn effort; step-scoped execution should use `StepContext::reasoning_effort`.
    pub(crate) reasoning_effort: Option<ReasoningEffortConfig>,
    /// Legacy turn summary; step-scoped execution should use `StepContext::reasoning_summary`.
    pub(crate) reasoning_summary: ReasoningSummaryConfig,
    pub(crate) session_source: SessionSource,
    pub(crate) history_mode: ThreadHistoryMode,
    pub(crate) parent_thread_id: Option<ThreadId>,
    pub(crate) originator: String,
    pub(crate) environments: TurnEnvironmentSnapshot,
    /// The session's absolute working directory. All relative paths provided
    /// by the model as well as sandbox policies are resolved against this path
    /// instead of `std::env::current_dir()`.
    #[deprecated(note = "use the selected turn environment cwd instead")]
    pub(crate) cwd: AbsolutePathBuf,
    pub(crate) current_date: Option<String>,
    pub(crate) timezone: Option<String>,
    pub(crate) app_server_client_name: Option<String>,
    pub(crate) developer_instructions: Option<String>,
    pub(crate) mode: ModeKind,
    pub(crate) collaboration_mode_developer_instructions: Option<String>,
    pub(crate) multi_agent_version: MultiAgentVersion,
    pub(crate) personality: Option<Personality>,
    pub(crate) network: Option<NetworkProxy>,
    // TODO(anp): Reconcile this parallel turn snapshot with TurnEnvironment::sandbox_context
    // so owner-provided environment settings govern the remaining sandbox decisions.
    pub(crate) windows_sandbox_level: WindowsSandboxLevel,
    pub(crate) available_models: Vec<ModelPreset>,
    pub(crate) unified_exec_shell_mode: UnifiedExecShellMode,
    pub(crate) final_output_json_schema: Option<Value>,
    pub(crate) dynamic_tools: Vec<DynamicToolSpec>,
    pub(crate) turn_metadata_state: Arc<TurnMetadataState>,
    pub(crate) extension_data: Arc<codex_extension_api::ExtensionData>,
    pub(crate) turn_timing_state: Arc<TurnTimingState>,
    pub(crate) terminal_error: Arc<Mutex<Option<ErrorEvent>>>,
    pub(crate) server_model_warning_emitted: AtomicBool,
    pub(crate) model_verification_emitted: AtomicBool,
}

enum TurnMultiAgentRuntime {
    ResolveAndStore,
    Preview,
}

impl TurnContext {
    pub(crate) fn skills_snapshot(&self) -> Arc<HostSkillsSnapshot> {
        let Some(snapshot) = self.extension_data.get::<HostSkillsSnapshot>() else {
            unreachable!("every turn has a host skills snapshot");
        };
        snapshot
    }

    pub(crate) fn collaboration_mode(&self) -> CollaborationMode {
        CollaborationMode {
            mode: self.mode,
            settings: Settings {
                model: self.model_info.slug.clone(),
                reasoning_effort: self.reasoning_effort.clone(),
                developer_instructions: self.collaboration_mode_developer_instructions.clone(),
            },
        }
    }

    pub(crate) fn plugin_attribution_for_command(
        &self,
        command: &[String],
        cwd: &AbsolutePathBuf,
    ) -> Option<PluginCommandAttribution> {
        self.extension_data
            .get::<TrustedPluginRoots>()?
            .resolve_attribution(command, cwd)
    }

    pub(crate) async fn plugin_attribution_for_executor_command(
        &self,
        command: &[String],
        cwd: &PathUri,
        file_system: &dyn ExecutorFileSystem,
    ) -> Option<PluginCommandAttribution> {
        self.extension_data
            .get::<TrustedPluginRoots>()?
            .resolve_executor_attribution(command, cwd, file_system)
            .await
    }

    /// Approval policy admitted with the turn; step-scoped actions should use
    /// `StepContext::approval_policy` instead.
    pub(crate) fn approval_policy(&self) -> AskForApproval {
        self.config.permissions.approval_policy.value()
    }

    pub(crate) fn allow_prefix_rules(&self) -> AllowPrefixRules {
        let ignore_rules = self
            .config
            .config_layer_stack
            .requirements_toml()
            .auto_review
            .as_ref()
            .and_then(|auto_review| auto_review.ignore_rules.as_ref())
            .is_some_and(|models| models.contains(&self.model_info.slug));
        if self.model_info.model_specialty.as_deref() == Some(MODEL_SPECIALTY_CYBER) || ignore_rules
        {
            AllowPrefixRules::IgnoreForCyberModel
        } else {
            AllowPrefixRules::Honor
        }
    }

    pub(crate) async fn plugin_metrics_operation_for_command(
        &self,
        command: &[String],
        cwd: &PathUri,
        environment: &Environment,
    ) -> Option<ResolvedPluginMetricsOperation> {
        let trusted_roots = self.extension_data.get::<TrustedPluginRoots>()?;
        if environment.is_remote() {
            trusted_roots
                .resolve_metrics_operation_in_filesystem(
                    command,
                    cwd,
                    environment.get_filesystem().as_ref(),
                )
                .await
        } else {
            trusted_roots.resolve_metrics_operation(command, &cwd.to_abs_path().ok()?)
        }
    }

    /// Returns the selected environment's permissions, or the thread's permissions when none is ready.
    pub(crate) fn permission_profile(&self) -> PermissionProfile {
        self.environments
            .permission_profile_or_else(|| self.config.permissions.effective_permission_profile())
    }

    pub(crate) fn file_system_sandbox_policy(&self) -> FileSystemSandboxPolicy {
        self.permission_profile().file_system_sandbox_policy()
    }

    pub(crate) fn network_sandbox_policy(&self) -> NetworkSandboxPolicy {
        self.permission_profile().network_sandbox_policy()
    }

    pub(crate) fn sandbox_policy(&self) -> SandboxPolicy {
        #[allow(deprecated)]
        codex_sandboxing::compatibility_sandbox_policy_for_permission_profile(
            &self.permission_profile(),
            &self.cwd,
        )
    }

    /// Combines the selected environment's workspace roots with its permission profile roots.
    pub(crate) fn effective_workspace_roots(&self) -> Vec<AbsolutePathBuf> {
        let Some(environment) = self.environments.primary() else {
            return self.config.effective_workspace_roots();
        };

        let mut workspace_roots = environment
            .workspace_roots()
            .iter()
            .filter_map(|root| root.to_abs_path().ok())
            .collect::<Vec<_>>();
        for root in environment
            .config()
            .permission_profile
            .profile_workspace_roots()
        {
            if !workspace_roots.contains(root) {
                workspace_roots.push(root.clone());
            }
        }
        workspace_roots
    }

    pub(crate) fn effective_reasoning_effort(&self) -> Option<ReasoningEffortConfig> {
        self.reasoning_effort
            .clone()
            .or_else(|| self.model_info.default_reasoning_level.clone())
    }

    pub(crate) fn effective_reasoning_effort_for_tracing(&self) -> String {
        self.effective_reasoning_effort()
            .map(|effort| effort.to_string())
            .unwrap_or_else(|| "default".to_string())
    }

    pub(crate) fn model_context_window(&self) -> Option<i64> {
        let effective_context_window_percent = self.model_info.effective_context_window_percent;
        self.model_info
            .resolved_context_window()
            .map(|context_window| {
                context_window.saturating_mul(effective_context_window_percent) / 100
            })
    }

    pub(crate) fn apps_enabled(&self) -> bool {
        let uses_codex_backend = self
            .auth_manager
            .as_deref()
            .is_some_and(AuthManager::current_auth_uses_codex_backend);
        self.config
            .features
            .apps_enabled_for_auth(uses_codex_backend)
            && self.config.orchestrator_mcp_enabled
    }

    pub(crate) async fn with_model(
        &self,
        model: String,
        models_manager: &SharedModelsManager,
    ) -> Self {
        let mut config = (*self.config).clone();
        config.model = Some(model.clone());
        let model_info = models_manager
            .get_model_info(model.as_str(), &config.to_models_manager_config())
            .await;
        let supported_reasoning_levels = model_info
            .supported_reasoning_levels
            .iter()
            .map(|preset| preset.effort.clone())
            .collect::<Vec<_>>();
        let reasoning_effort = if let Some(current_reasoning_effort) = self.reasoning_effort.clone()
        {
            if supported_reasoning_levels.contains(&current_reasoning_effort) {
                Some(current_reasoning_effort)
            } else {
                supported_reasoning_levels
                    .get(supported_reasoning_levels.len().saturating_sub(1) / 2)
                    .cloned()
                    .or_else(|| model_info.default_reasoning_level.clone())
            }
        } else {
            supported_reasoning_levels
                .get(supported_reasoning_levels.len().saturating_sub(1) / 2)
                .cloned()
                .or_else(|| model_info.default_reasoning_level.clone())
        };
        config.model_reasoning_effort = reasoning_effort.clone();

        let available_models = models_manager
            .list_models(
                RefreshStrategy::OnlineIfUncached,
                config.http_client_factory(),
            )
            .await;
        let model_info = Arc::new(model_info);

        Self {
            sub_id: self.sub_id.clone(),
            trace_id: self.trace_id.clone(),
            realtime_active: self.realtime_active,
            code_mode_available: self.code_mode_available,
            config: Arc::new(config),
            auth_manager: self.auth_manager.clone(),
            model_info: Arc::clone(&model_info),
            session_telemetry: self
                .session_telemetry
                .clone()
                .with_model(model.as_str(), model_info.slug.as_str()),
            provider: self.provider.clone(),
            reasoning_effort,
            reasoning_summary: self.reasoning_summary,
            session_source: self.session_source.clone(),
            history_mode: self.history_mode,
            parent_thread_id: self.parent_thread_id,
            originator: self.originator.clone(),
            environments: self.environments.clone(),
            #[allow(deprecated)]
            cwd: self.cwd.clone(),
            current_date: self.current_date.clone(),
            timezone: self.timezone.clone(),
            app_server_client_name: self.app_server_client_name.clone(),
            developer_instructions: self.developer_instructions.clone(),
            mode: self.mode,
            collaboration_mode_developer_instructions: self
                .collaboration_mode_developer_instructions
                .clone(),
            multi_agent_version: self.multi_agent_version,
            personality: self.personality,
            network: self.network.clone(),
            windows_sandbox_level: self.windows_sandbox_level,
            available_models,
            unified_exec_shell_mode: self.unified_exec_shell_mode.clone(),
            final_output_json_schema: self.final_output_json_schema.clone(),
            dynamic_tools: self.dynamic_tools.clone(),
            turn_metadata_state: self.turn_metadata_state.clone(),
            extension_data: Arc::clone(&self.extension_data),
            turn_timing_state: Arc::clone(&self.turn_timing_state),
            terminal_error: Arc::clone(&self.terminal_error),
            server_model_warning_emitted: AtomicBool::new(
                self.server_model_warning_emitted.load(Ordering::Relaxed),
            ),
            model_verification_emitted: AtomicBool::new(
                self.model_verification_emitted.load(Ordering::Relaxed),
            ),
        }
    }

    fn non_legacy_file_system_sandbox_policy(&self) -> Option<RawFileSystemSandboxPolicy> {
        // Omit the derived split filesystem policy when it is equivalent to
        // the legacy sandbox policy. This keeps turn-context payloads stable
        // while both fields exist; once callers consume only the split policy,
        // this comparison and the legacy projection should go away.
        let legacy_file_system_sandbox_policy =
            FileSystemSandboxPolicy::from_legacy_sandbox_policy_for_cwd(
                &self.sandbox_policy(),
                #[allow(deprecated)]
                &self.cwd,
            );
        let file_system_sandbox_policy = self.file_system_sandbox_policy();
        // `permission_profile` below is authoritative and serializes the same
        // runtime entries, so this compatibility field may omit an unrenderable policy.
        (file_system_sandbox_policy != legacy_file_system_sandbox_policy)
            .then(|| file_system_sandbox_policy.try_into().ok())
            .flatten()
    }

    pub(crate) fn to_turn_context_item(&self) -> TurnContextItem {
        let workspace_roots = self.effective_workspace_roots();
        #[allow(deprecated)]
        let cwd = self.cwd.clone();
        TurnContextItem {
            turn_id: Some(self.sub_id.clone()),
            cwd,
            workspace_roots: (!workspace_roots.is_empty()).then_some(workspace_roots),
            current_date: self.current_date.clone(),
            timezone: self.timezone.clone(),
            approval_policy: self.approval_policy(),
            approvals_reviewer: Some(self.config.approvals_reviewer),
            sandbox_policy: self.sandbox_policy(),
            permission_profile: Some(self.permission_profile()),
            active_permission_profile: self.environments.primary().map_or_else(
                || self.config.permissions.active_permission_profile(),
                TurnEnvironment::active_permission_profile,
            ),
            network: self.turn_context_network_item(),
            file_system_sandbox_policy: self.non_legacy_file_system_sandbox_policy(),
            model: self.model_info.slug.clone(),
            comp_hash: self.model_info.comp_hash.clone(),
            personality: self.personality,
            collaboration_mode: Some(self.collaboration_mode()),
            multi_agent_version: Some(self.multi_agent_version),
            multi_agent_mode: None,
            realtime_active: Some(self.realtime_active),
            effort: self.reasoning_effort.clone(),
            summary: ReasoningSummaryConfig::Auto,
        }
    }

    fn turn_context_network_item(&self) -> Option<TurnContextNetworkItem> {
        let network = self
            .config
            .config_layer_stack
            .requirements()
            .network
            .as_ref()?;
        Some(TurnContextNetworkItem {
            allowed_domains: network
                .domains
                .as_ref()
                .and_then(codex_config::NetworkDomainPermissionsToml::allowed_domains)
                .unwrap_or_default(),
            denied_domains: network
                .domains
                .as_ref()
                .and_then(codex_config::NetworkDomainPermissionsToml::denied_domains)
                .unwrap_or_default(),
        })
    }
}

fn local_time_context() -> (String, String) {
    match iana_time_zone::get_timezone() {
        Ok(timezone) => (Local::now().format("%Y-%m-%d").to_string(), timezone),
        Err(_) => (
            Utc::now().format("%Y-%m-%d").to_string(),
            "Etc/UTC".to_string(),
        ),
    }
}

impl Session {
    /// Don't expand the number of mutated arguments on config. We are in the process of getting rid of it.
    pub(crate) fn build_per_turn_config(
        &self,
        session_configuration: &SessionConfiguration,
        cwd: AbsolutePathBuf,
    ) -> Config {
        // todo(aibrahim): store this state somewhere else so we don't need to mut config
        let config = session_configuration.original_config_do_not_use.clone();
        let mut per_turn_config = (*config).clone();
        per_turn_config.cwd = cwd;
        per_turn_config.permissions.approval_policy = session_configuration.approval_policy.clone();
        let workspace_roots = self.services.turn_environments.primary_workspace_roots();
        per_turn_config.workspace_roots = workspace_roots.clone();
        per_turn_config
            .permissions
            .set_workspace_roots(workspace_roots);
        per_turn_config.model_reasoning_effort =
            session_configuration.collaboration_mode.reasoning_effort();
        per_turn_config.model_reasoning_summary = session_configuration.model_reasoning_summary;
        per_turn_config.service_tier = session_configuration.service_tier.clone();
        per_turn_config.personality = session_configuration.personality;
        per_turn_config.approvals_reviewer = session_configuration.approvals_reviewer;
        session_configuration
            .apply_permission_profile_to_permissions(&mut per_turn_config.permissions);
        let permission_profile = session_configuration.permission_profile();
        let resolved_web_search_mode = resolve_web_search_mode_for_turn(
            &per_turn_config.web_search_mode,
            &permission_profile,
            session_configuration.provider.capabilities(),
        );
        if let Err(err) = per_turn_config
            .web_search_mode
            .set(resolved_web_search_mode)
        {
            let fallback_value = per_turn_config.web_search_mode.value();
            tracing::warn!(
                error = %err,
                ?resolved_web_search_mode,
                ?fallback_value,
                "resolved web_search_mode is disallowed by requirements; keeping constrained value"
            );
        }
        per_turn_config.features = config.features.clone();
        per_turn_config
    }

    pub(crate) fn build_effective_session_config(
        &self,
        session_configuration: &SessionConfiguration,
    ) -> Config {
        let mut config =
            self.build_per_turn_config(session_configuration, session_configuration.cwd().clone());
        config.model = Some(session_configuration.collaboration_mode.model().to_string());
        config
    }

    #[allow(clippy::too_many_arguments)]
    #[instrument(name = "turn_context.make", level = "trace", skip_all)]
    pub(crate) fn make_turn_context(
        thread_id: ThreadId,
        session_id: SessionId,
        auth_manager: Option<Arc<AuthManager>>,
        session_telemetry: &SessionTelemetry,
        provider: SharedModelProvider,
        session_configuration: &SessionConfiguration,
        multi_agent_version: MultiAgentVersion,
        user_shell: &shell::Shell,
        shell_zsh_path: Option<&PathBuf>,
        main_execve_wrapper_exe: Option<&PathBuf>,
        per_turn_config: Config,
        model_info: ModelInfo,
        models_manager: &SharedModelsManager,
        network: Option<NetworkProxy>,
        environments: TurnEnvironmentSnapshot,
        cwd: AbsolutePathBuf,
        sub_id: String,
        skills_snapshot: HostSkillsSnapshot,
    ) -> TurnContext {
        let collaboration_mode = &session_configuration.collaboration_mode;
        let reasoning_effort = collaboration_mode.reasoning_effort();
        let reasoning_summary = session_configuration
            .model_reasoning_summary
            .unwrap_or(model_info.default_reasoning_summary);
        let session_telemetry = session_telemetry.clone().with_model(
            session_configuration.collaboration_mode.model(),
            model_info.slug.as_str(),
        );
        let session_source = session_configuration.session_source.clone();
        let session_telemetry_for_context = session_telemetry;
        let available_models = models_manager.try_list_models().unwrap_or_default();
        let unified_exec_shell_mode = UnifiedExecShellMode::for_session(
            per_turn_config.features.get(),
            crate::tools::tool_user_shell_type(user_shell),
            shell_zsh_path,
            main_execve_wrapper_exe,
        );

        let mut per_turn_config = per_turn_config;
        super::token_budget::apply_model_defaults(&mut per_turn_config, &model_info);
        per_turn_config.service_tier = get_service_tier(
            per_turn_config.service_tier,
            per_turn_config.features.enabled(Feature::FastMode),
            &model_info,
        );
        let permission_profile = environments.permission_profile_or_else(|| {
            per_turn_config.permissions.effective_permission_profile()
        });
        let auto_review_enabled = crate::guardian::routes_approval_policy_to_guardian(
            per_turn_config.permissions.approval_policy.value(),
            per_turn_config.approvals_reviewer,
        );
        let per_turn_config = Arc::new(per_turn_config);
        let turn_metadata_state = Arc::new(TurnMetadataState::new(
            session_id.to_string(),
            thread_id.to_string(),
            session_configuration.forked_from_thread_id,
            session_configuration.parent_thread_id,
            &session_configuration.session_source,
            session_configuration.thread_source.clone(),
            sub_id.clone(),
            cwd.clone(),
            &permission_profile,
            session_configuration.windows_sandbox_level,
            network.is_some(),
            auto_review_enabled,
            &model_info,
        ));
        turn_metadata_state
            .set_responses_api_metadata(per_turn_config.responses_api_metadata.clone());
        let (current_date, timezone) = local_time_context();
        let extension_data = Arc::new(codex_extension_api::ExtensionData::new(sub_id.clone()));
        extension_data.insert(skills_snapshot);
        TurnContext {
            sub_id,
            trace_id: current_span_trace_id(),
            realtime_active: false,
            code_mode_available: true,
            config: per_turn_config,
            auth_manager,
            model_info: Arc::new(model_info),
            session_telemetry: session_telemetry_for_context,
            provider,
            reasoning_effort,
            reasoning_summary,
            session_source,
            history_mode: session_configuration.history_mode,
            parent_thread_id: session_configuration.parent_thread_id,
            originator: session_configuration.originator.clone(),
            environments,
            #[allow(deprecated)]
            cwd,
            current_date: Some(current_date),
            timezone: Some(timezone),
            app_server_client_name: session_configuration.app_server_client_name.clone(),
            developer_instructions: session_configuration.developer_instructions.clone(),
            mode: collaboration_mode.mode,
            collaboration_mode_developer_instructions: collaboration_mode
                .settings
                .developer_instructions
                .clone(),
            multi_agent_version,
            personality: session_configuration.personality,
            network,
            windows_sandbox_level: session_configuration.windows_sandbox_level,
            available_models,
            unified_exec_shell_mode,
            final_output_json_schema: None,
            dynamic_tools: session_configuration.dynamic_tools.clone(),
            turn_metadata_state,
            extension_data,
            turn_timing_state: Arc::new(TurnTimingState::default()),
            terminal_error: Arc::new(Mutex::new(None)),
            server_model_warning_emitted: AtomicBool::new(false),
            model_verification_emitted: AtomicBool::new(false),
        }
    }

    pub(crate) async fn new_turn_with_sub_id(
        &self,
        sub_id: String,
        updates: SessionSettingsUpdate,
    ) -> CodexResult<Arc<TurnContext>> {
        let notify_config_contributors = !self.services.extensions.config_contributors().is_empty();
        let update_result: CodexResult<_> = {
            let mut state = self.state.lock().await;
            match self.apply_session_settings(&state.session_configuration, &updates) {
                Ok(next) => {
                    let mcp_inputs_changed =
                        self.mcp_inputs_differ(&state.session_configuration, &next, &updates);
                    if mcp_inputs_changed {
                        self.mark_mcp_runtime_dirty();
                    }
                    let previous_permission_profile =
                        state.session_configuration.permission_profile();
                    let next_permission_profile = next.permission_profile();
                    let permission_profile_changed =
                        previous_permission_profile != next_permission_profile;
                    let previous_config = notify_config_contributors
                        .then(|| self.build_effective_session_config(&state.session_configuration));
                    let environment_config = next.inferred_environment_config();
                    if let Some(environments) = &updates.environments {
                        self.services
                            .turn_environments
                            .update_selections(&environments.environments, &environment_config);
                    } else if state.session_configuration.inferred_environment_config()
                        != environment_config
                    {
                        self.services
                            .turn_environments
                            .update_thread_config(&environment_config);
                    }
                    state.session_configuration = next.clone();
                    let new_config = notify_config_contributors
                        .then(|| self.build_effective_session_config(&state.session_configuration));
                    Ok((
                        next,
                        mcp_inputs_changed,
                        permission_profile_changed,
                        previous_config,
                        new_config,
                    ))
                }
                Err(err) => Err(CodexErr::InvalidRequest(err.to_string())),
            }
        };

        let (
            mut session_configuration,
            mcp_inputs_changed,
            permission_profile_changed,
            previous_config,
            new_config,
        ) = match update_result {
            Ok(update) => update,
            Err(err) => {
                let message = err.to_string();
                self.send_event_raw(Event {
                    id: sub_id.clone(),
                    msg: EventMsg::Error(ErrorEvent {
                        message: message.clone(),
                        codex_error_info: Some(CodexErrorInfo::BadRequest),
                    }),
                })
                .await;
                return Err(CodexErr::InvalidRequest(message));
            }
        };
        self.emit_config_changed_contributors(previous_config.as_ref(), new_config.as_ref());
        if mcp_inputs_changed {
            self.schedule_mcp_prewarm();
        }

        if permission_profile_changed {
            self.refresh_managed_network_proxy_for_current_permission_profile()
                .await;
        }
        // Apply the override only to the turn's copy, after persisting thread settings.
        if let Some(service_tier) = updates.service_tier_for_turn {
            session_configuration.service_tier = Some(service_tier);
        }
        Ok(self
            .new_turn_from_configuration(
                sub_id,
                session_configuration,
                updates.final_output_json_schema,
            )
            .await)
    }

    async fn new_turn_from_configuration(
        &self,
        sub_id: String,
        session_configuration: SessionConfiguration,
        final_output_json_schema: Option<Option<Value>>,
    ) -> Arc<TurnContext> {
        self.new_turn_context_from_configuration(
            sub_id,
            session_configuration,
            final_output_json_schema,
            TurnMultiAgentRuntime::ResolveAndStore,
            self.git_enrichment_policy,
        )
        .await
    }

    async fn new_startup_prewarm_turn_from_configuration(
        &self,
        sub_id: String,
        session_configuration: SessionConfiguration,
    ) -> Arc<TurnContext> {
        self.new_turn_context_from_configuration(
            sub_id,
            session_configuration,
            /*final_output_json_schema*/ None,
            TurnMultiAgentRuntime::Preview,
            GitEnrichmentPolicy::Skip,
        )
        .await
    }

    #[instrument(name = "turn_context.build", level = "trace", skip_all)]
    async fn new_turn_context_from_configuration(
        &self,
        sub_id: String,
        session_configuration: SessionConfiguration,
        final_output_json_schema: Option<Option<Value>>,
        multi_agent_runtime: TurnMultiAgentRuntime,
        git_enrichment_policy: GitEnrichmentPolicy,
    ) -> Arc<TurnContext> {
        let turn_environments = self.services.turn_environments.snapshot().await;
        let primary_turn_environment = turn_environments.primary();
        // TODO(anp): Migrate per-turn config and legacy TurnContext cwd consumers to PathUri so
        // a foreign primary environment does not fall back to the session's host cwd.
        let cwd = primary_turn_environment
            .as_ref()
            .and_then(|turn_environment| turn_environment.cwd().to_abs_path().ok())
            .unwrap_or_else(|| session_configuration.cwd().clone());
        let per_turn_config = self.build_per_turn_config(&session_configuration, cwd.clone());
        let network_permission_profile = primary_turn_environment
            .map(TurnEnvironment::permission_profile)
            .cloned()
            .unwrap_or_else(|| session_configuration.permission_profile());
        let model_info = self
            .services
            .models_manager
            .get_model_info(
                session_configuration.collaboration_mode.model(),
                &per_turn_config.to_models_manager_config(),
            )
            .await;
        self.services
            .thread_extension_data
            .insert(model_info.clone());

        let multi_agent_version = match multi_agent_runtime {
            TurnMultiAgentRuntime::ResolveAndStore => {
                self.resolve_multi_agent_version_for_model(&model_info, &per_turn_config)
            }
            TurnMultiAgentRuntime::Preview => per_turn_config.multi_agent_version_for_model(
                self.multi_agent_version()
                    .or(model_info.multi_agent_version),
            ),
        };
        let plugins_input = per_turn_config.plugins_config_input();
        let plugin_outcome = self
            .services
            .plugins_manager
            .plugins_for_config(&plugins_input)
            .await;
        let trusted_plugin_roots = TrustedPluginRoots::from_plugin_load_outcome(
            &plugin_outcome,
            per_turn_config.codex_home.as_path(),
        );
        let effective_skill_roots = plugin_outcome.effective_plugin_skill_roots();
        let plugin_skill_snapshots = self
            .services
            .plugins_manager
            .plugin_skill_snapshots_for_config(&plugins_input);
        let skills_input = skills_load_input_from_config(&per_turn_config, effective_skill_roots)
            .with_plugin_skill_snapshots(plugin_skill_snapshots);
        let fs = primary_turn_environment
            .map(|turn_environment| turn_environment.environment.get_filesystem());
        let skills_snapshot = self
            .services
            .skills_service
            .snapshot_for_config(&skills_input, fs)
            .await;
        let mut turn_context: TurnContext = Self::make_turn_context(
            self.thread_id(),
            self.session_id(),
            Some(Arc::clone(&self.services.auth_manager)),
            &self.services.session_telemetry,
            session_configuration.provider.clone(),
            &session_configuration,
            multi_agent_version,
            self.services.user_shell.as_ref(),
            self.services.shell_zsh_path.as_ref(),
            self.services.main_execve_wrapper_exe.as_ref(),
            per_turn_config,
            model_info,
            &self.services.models_manager,
            self.services
                .network_proxy
                .load_full()
                .as_ref()
                .and_then(|started_proxy| {
                    Self::managed_network_proxy_active_for_permission_profile(
                        &network_permission_profile,
                    )
                    .then(|| started_proxy.proxy())
                }),
            turn_environments,
            cwd,
            sub_id,
            skills_snapshot,
        );
        turn_context.code_mode_available = self.services.code_mode_service.is_available();
        turn_context.extension_data.insert(trusted_plugin_roots);
        turn_context.realtime_active = self.conversation.running_state().await.is_some();

        if let Some(final_schema) = final_output_json_schema {
            turn_context.final_output_json_schema = final_schema;
        }
        let turn_context = Arc::new(turn_context);
        if git_enrichment_policy == GitEnrichmentPolicy::Fresh
            && turn_context
                .environments
                .single_local_environment_cwd()
                .is_some()
        {
            turn_context.turn_metadata_state.spawn_git_enrichment_task();
        }
        turn_context
    }

    pub(crate) async fn maybe_emit_model_warnings_for_turn(&self, tc: &TurnContext) {
        if tc.model_info.used_fallback_model_metadata {
            self.send_event(
                tc,
                EventMsg::Warning(WarningEvent {
                    message: format!(
                        "Model metadata for `{}` not found. Defaulting to fallback metadata; this can degrade performance and cause issues.",
                        tc.model_info.slug
                    ),
                }),
            )
            .await;
        }

        if !tc.code_mode_available
            && matches!(
                crate::tools::requested_tool_mode(tc),
                codex_protocol::openai_models::ToolMode::CodeMode
                    | codex_protocol::openai_models::ToolMode::CodeModeOnly
            )
            && let Some(message) = self
                .services
                .code_mode_service
                .take_unavailable_warning(crate::tools::effective_tool_mode(tc))
        {
            self.send_event(tc, EventMsg::Warning(WarningEvent { message }))
                .await;
        }

        if let Some(message) =
            unsupported_code_mode_warning(&tc.model_info, tc.config.features.get())
        {
            self.send_event(tc, EventMsg::Warning(WarningEvent { message }))
                .await;
        }
    }

    pub(crate) async fn new_default_turn(&self) -> Arc<TurnContext> {
        self.new_default_turn_with_sub_id(self.next_internal_sub_id())
            .await
    }

    pub(crate) async fn new_default_turn_with_sub_id(&self, sub_id: String) -> Arc<TurnContext> {
        let session_configuration = self.default_turn_configuration().await;
        self.new_turn_from_configuration(
            sub_id,
            session_configuration,
            /*final_output_json_schema*/ None,
        )
        .await
    }

    pub(crate) async fn new_startup_prewarm_turn_with_sub_id(
        &self,
        sub_id: String,
    ) -> Arc<TurnContext> {
        let session_configuration = self.default_turn_configuration().await;
        self.new_startup_prewarm_turn_from_configuration(sub_id, session_configuration)
            .await
    }

    async fn default_turn_configuration(&self) -> SessionConfiguration {
        let state = self.state.lock().await;
        state.session_configuration.clone()
    }
}