//! Session configuration and thread-header orchestration for `ChatWidget`.

use super::*;

impl ChatWidget {
    fn on_session_configured_with_display_and_fork_parent_title(
        &mut self,
        session: ThreadSessionState,
        display: SessionConfiguredDisplay,
        fork_parent_title: Option<String>,
    ) {
        self.transcript.reset_copy_history();
        let history_metadata = session.message_history.unwrap_or_default();
        self.bottom_pane.set_history_metadata(
            session.thread_id,
            history_metadata.log_id,
            history_metadata.entry_count,
        );
        self.set_skills(/*skills*/ None);
        self.session_network_proxy = session.network_proxy.clone();
        let previous_thread_id = self.thread_id;
        let connector_scope_changed = previous_thread_id != Some(session.thread_id)
            || self.config.cwd.as_path() != session.cwd.as_path();
        self.thread_id = Some(session.thread_id);
        self.bottom_pane
            .set_queue_submissions(/*queue_submissions*/ false);
        if previous_thread_id != self.thread_id {
            self.pending_automatic_thread_names.clear();
            self.review.recent_auto_review_denials = RecentAutoReviewDenials::default();
            self.clear_thread_usage_state();
        }
        self.turn_lifecycle.reset_thread();
        self.clear_safety_buffering();
        self.thread_name = session.thread_name.clone();
        self.current_goal_status_indicator = None;
        self.current_goal_status = None;
        self.update_collaboration_mode_indicator();
        self.forked_from = session.forked_from_id;
        self.current_rollout_path = session.rollout_path.clone();
        self.current_cwd = Some(session.cwd.to_path_buf());
        self.config.cwd = session.cwd.clone();
        if connector_scope_changed {
            self.invalidate_connector_scope();
        }
        let runtime_workspace_roots = session.runtime_workspace_roots.clone();
        self.config.workspace_roots = runtime_workspace_roots.clone();
        self.config
            .permissions
            .set_workspace_roots(runtime_workspace_roots);
        self.effective_service_tier = session.service_tier.clone();
        if let Err(err) = self
            .config
            .permissions
            .approval_policy
            .set(session.approval_policy.to_core())
        {
            tracing::warn!(%err, "failed to sync approval_policy from SessionConfigured");
            self.config.permissions.approval_policy =
                Constrained::allow_only(session.approval_policy.to_core());
        }
        let permission_snapshot = PermissionProfileSnapshot::from_session_snapshot(
            session.permission_profile.clone(),
            session.active_permission_profile.clone(),
        );
        let permission_sync = self
            .config
            .permissions
            .set_permission_profile_from_session_snapshot(permission_snapshot.clone());
        if let Err(err) = permission_sync {
            tracing::warn!(%err, "failed to sync permissions from SessionConfigured");
            if let Err(replace_err) = self
                .config
                .permissions
                .replace_permission_profile_from_session_snapshot(permission_snapshot)
            {
                tracing::error!(
                    %replace_err,
                    "failed to replace permissions from SessionConfigured after constraint fallback"
                );
            }
        }
        self.config.approvals_reviewer = session.approvals_reviewer;
        self.config.personality = session.personality;
        self.status_line_project_root_name_cache = None;
        let forked_from_id = session.forked_from_id;
        let default_model = session.model.clone();
        self.current_collaboration_mode = self.current_collaboration_mode.with_updates(
            Some(default_model.clone()),
            Some(session.reasoning_effort.clone()),
            /*developer_instructions*/ None,
        );
        if session.reasoning_effort == Some(ReasoningEffortConfig::Ultra) {
            self.set_plan_mode_reasoning_effort(Some(ReasoningEffortConfig::Ultra));
        }
        match session.collaboration_mode.as_deref() {
            Some(collaboration_mode) => {
                self.set_effective_collaboration_mode(collaboration_mode.clone());
            }
            None => {
                self.active_collaboration_mask = Self::initial_collaboration_mask(
                    &self.config,
                    self.model_catalog.as_ref(),
                    Some(&default_model),
                );
                if let Some(mask) = self.active_collaboration_mask.as_mut() {
                    mask.reasoning_effort = Some(session.reasoning_effort.clone());
                }
                self.update_collaboration_mode_indicator();
            }
        }
        let effort = self.effective_reasoning_effort();
        self.bottom_pane
            .set_active_reasoning_effort_baseline(effort.as_ref());
        self.refresh_model_display();
        self.refresh_status_surfaces();
        self.sync_service_tier_commands();
        self.sync_personality_command_enabled();
        self.sync_plugins_command_enabled();
        self.sync_goal_command_enabled();
        self.refresh_plugin_mentions();
        let model_for_header = self.current_model().to_string();
        if matches!(
            display,
            SessionConfiguredDisplay::Normal | SessionConfiguredDisplay::PromptEdit
        ) {
            let startup_tooltip_override = self.startup_tooltip_override.take();
            let show_fast_status = self
                .should_show_fast_status(&model_for_header, self.effective_service_tier.as_deref());
            let session_info_cell = history_cell::new_session_info(
                &self.config,
                &model_for_header,
                &session,
                self.show_welcome_banner,
                startup_tooltip_override,
                self.plan_type,
                show_fast_status,
            );
            self.apply_session_info_cell(session_info_cell);
        } else if self
            .transcript
            .active_cell
            .as_ref()
            .is_some_and(|cell| cell.as_any().is::<history_cell::SessionHeaderHistoryCell>())
        {
            self.transcript.active_cell = None;
            self.bump_active_cell_revision();
        }
        self.transcript.saw_copy_source_this_turn = false;
        self.refresh_skills_for_current_cwd(/*force_reload*/ true);
        self.refresh_connector_mentions(/*force_refresh*/ false);
        let initial_user_message_pending = self.initial_user_message.is_some();
        self.submit_initial_user_message_if_pending();
        if self.mcp_startup_status.is_none()
            && (!initial_user_message_pending || self.is_user_turn_pending_or_running())
        {
            self.maybe_send_next_queued_input();
        }
        if display == SessionConfiguredDisplay::Normal
            && let Some(forked_from_id) = forked_from_id
        {
            self.emit_forked_thread_event(forked_from_id, fork_parent_title);
        }
        if !self.suppress_session_configured_redraw {
            self.request_redraw();
        }
    }

    pub(crate) fn handle_thread_session(&mut self, session: ThreadSessionState) {
        self.instruction_source_paths = session.instruction_source_paths.clone();
        let fork_parent_title = session.fork_parent_title.clone();
        self.on_session_configured_with_display_and_fork_parent_title(
            session,
            SessionConfiguredDisplay::Normal,
            fork_parent_title,
        );
    }

    pub(crate) fn handle_thread_session_quiet(&mut self, session: ThreadSessionState) {
        self.instruction_source_paths = session.instruction_source_paths.clone();
        self.on_session_configured_with_display_and_fork_parent_title(
            session,
            SessionConfiguredDisplay::Quiet,
            /*fork_parent_title*/ None,
        );
    }

    pub(crate) fn handle_prompt_edit_thread_session(&mut self, session: ThreadSessionState) {
        self.instruction_source_paths = session.instruction_source_paths.clone();
        let fork_parent_title = session.fork_parent_title.clone();
        self.on_session_configured_with_display_and_fork_parent_title(
            session,
            SessionConfiguredDisplay::PromptEdit,
            fork_parent_title,
        );
    }

    pub(crate) fn handle_side_thread_session(&mut self, session: ThreadSessionState) {
        self.instruction_source_paths = session.instruction_source_paths.clone();
        let fork_parent_title = session.fork_parent_title.clone();
        self.on_session_configured_with_display_and_fork_parent_title(
            session,
            SessionConfiguredDisplay::SideConversation,
            fork_parent_title,
        );
    }

    pub(super) fn emit_forked_thread_event(
        &mut self,
        forked_from_id: ThreadId,
        fork_parent_title: Option<String>,
    ) {
        let forked_from_id_text = forked_from_id.to_string();
        let line: Line<'static> = if let Some(name) = fork_parent_title
            && !name.trim().is_empty()
        {
            vec![
                "• ".dim(),
                "Thread forked from ".into(),
                name.cyan(),
                " (".into(),
                forked_from_id_text.cyan(),
                ")".into(),
            ]
            .into()
        } else {
            vec![
                "• ".dim(),
                "Thread forked from ".into(),
                forked_from_id_text.cyan(),
            ]
            .into()
        };
        self.app_event_tx.send(AppEvent::InsertHistoryCell(Box::new(
            PlainHistoryCell::new(vec![line]),
        )));
    }

    pub(crate) fn emit_prompt_edit_thread_event(&mut self) {
        let line: Line<'static> = vec![
            "• ".dim(),
            "You’re continuing from this point in a new conversation".into(),
        ]
        .into();
        self.app_event_tx.send(AppEvent::InsertHistoryCell(Box::new(
            PlainHistoryCell::new(vec![line]),
        )));
    }

    /// Apply a persisted automatic name immediately and suppress its confirmation.
    pub(crate) fn expect_automatic_thread_name(&mut self, name: String) {
        self.thread_name = Some(name.clone());
        self.pending_automatic_thread_names.insert(name);
    }

    /// Make a confirmed manual rename visible before its queued server notification arrives.
    pub(crate) fn expect_manual_thread_name(&mut self, thread_id: ThreadId, name: String) {
        if self.thread_id == Some(thread_id) {
            self.thread_name = Some(name);
            self.refresh_status_surfaces();
            self.request_redraw();
        }
    }

    pub(super) fn on_thread_name_updated(
        &mut self,
        thread_id: ThreadId,
        thread_name: Option<String>,
    ) {
        if self.thread_id == Some(thread_id) {
            let automatic = thread_name
                .as_ref()
                .is_some_and(|name| self.pending_automatic_thread_names.remove(name));

            if let Some(name) = thread_name.as_deref()
                && !automatic
            {
                let cell = Self::rename_confirmation_cell(name, self.thread_id);
                self.add_boxed_history(Box::new(cell));
            }

            self.thread_name = thread_name;
            self.refresh_status_surfaces();
            self.request_redraw();
            self.maybe_send_next_queued_input();
        }
    }

    pub(super) fn set_skills(&mut self, skills: Option<Vec<SkillMetadata>>) {
        self.bottom_pane.set_skills(skills);
    }
}