carryctx 0.2.0

Persistent project context for coding agents
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use crate::*;
use carryctx::application;
use carryctx::application::runtime::InvocationContext;
use carryctx::error::{CarryCtxError, ExitCode};
use clap::Parser;

// ── Session ──────────────────────────────────────────────────────────────

#[derive(Parser, Debug)]
pub enum SessionCommand {
    /// Initialize and start a new agent session, binding it to the current context
    Start {
        /// Override the agent ULID creating this session
        #[arg(long)]
        agent: Option<String>,
        /// Bind the session explicitly to a task ULID
        #[arg(long)]
        task: Option<String>,
        /// Specify the LLM provider for telemetry
        #[arg(long)]
        provider: Option<String>,
        /// Bind to a specific worktree directory
        #[arg(long)]
        worktree: Option<String>,
        /// Re-use the currently active session if one exists, rather than erroring
        #[arg(long)]
        reuse: bool,
    },
    /// List historical and active sessions
    List,
    /// Show metadata and transition history for a specific session
    Show { session_id: String },
    /// Print the currently active session ID
    Current,
    /// Pause the active session, logging a sleep/pause transition
    Pause { session_id: Option<String> },
    /// Resume a previously paused session, logging an awake/resume transition
    Resume { session_id: Option<String> },
    /// End the active session cleanly, marking it as terminated
    End {
        session_id: Option<String>,
        /// A brief summary of what was accomplished during the session
        #[arg(long)]
        summary: Option<String>,
    },
    /// Forcibly abandon a session without recording a clean end state
    Abandon {
        session_id: Option<String>,
        /// The reason the session was abandoned (e.g., crash, fatal error)
        #[arg(long)]
        reason: Option<String>,
    },
}

#[derive(Parser, Debug)]
pub struct SessionArgs {
    /// Session subcommand to execute
    #[command(subcommand)]
    pub command: SessionCommand,
}

// ═══════════════════════════════════════════════════════════════════════════
//  Handler: session
// ═══════════════════════════════════════════════════════════════════════════

pub fn handle_session(
    args: &SessionArgs,
    ctx: &InvocationContext,
    is_json: bool,
) -> Result<ExitCode, ExitCode> {
    let mut runtime = try_open_runtime(ctx)?;
    let project_id = &runtime.config.project.id;
    let conn = runtime.database.connection_mut();

    let session_repo = SqliteSessionRepository::new(conn);
    let event_repo = SqliteEventRepository::new(conn);
    let now = chrono::Utc::now().to_rfc3339();

    match &args.command {
        SessionCommand::Start {
            agent,
            task,
            provider,
            worktree,
            reuse: _,
        } => {
            let agent_candidate = agent
                .clone()
                .or_else(|| ctx.agent.clone())
                .unwrap_or_else(|| "default".to_string());
            let agent_id = match resolve_agent_id(project_id, &agent_candidate, conn) {
                Ok(id) => id,
                Err(e) => {
                    return render_and_print(
                        "session.start",
                        Err::<serde_json::Value, _>(e),
                        is_json,
                        ctx.quiet,
                    );
                }
            };

            let task_id = match task.clone().or_else(|| ctx.task.clone()) {
                Some(t_ref) if !t_ref.is_empty() => {
                    match resolve_task_id(project_id, &t_ref, conn) {
                        Ok(id) => Some(id),
                        Err(e) => {
                            return render_and_print(
                                "session.start",
                                Err::<serde_json::Value, _>(e),
                                is_json,
                                ctx.quiet,
                            );
                        }
                    }
                }
                _ => None,
            };

            let input = application::session::StartSessionInput {
                project_id: project_id.to_string(),
                agent_id,
                task_id,
                worktree_id: worktree.clone(),
                branch: runtime.git_project.branch.clone(),
                head: Some(runtime.git_project.head.clone()),
                cwd: Some(ctx.cwd.to_string_lossy().to_string()),
                provider: provider.clone(),
            };
            let result =
                application::session::start_session(&session_repo, &event_repo, &input, &now);
            render_and_print("session.start", result, is_json, ctx.quiet)
        }
        SessionCommand::List => {
            let result = application::session::list_sessions(&session_repo, project_id);
            render_and_print("session.list", result, is_json, ctx.quiet)
        }
        SessionCommand::Show { session_id } => {
            let result = application::session::show_session(&session_repo, project_id, session_id);
            render_and_print("session.show", result, is_json, ctx.quiet)
        }
        SessionCommand::Current => {
            let sessions = session_repo.list(project_id).map_err(|e| e.exit_code)?;
            let current = sessions
                .into_iter()
                .find(|s| matches!(s.state, carryctx::domain::session::SessionState::Active));
            render_and_print(
                "session.current",
                current.ok_or_else(|| CarryCtxError::resource_not_found("No active session")),
                is_json,
                ctx.quiet,
            )
        }
        SessionCommand::Pause { session_id } => {
            let sid = session_id.clone().unwrap_or_else(|| {
                find_active_session_id(&session_repo, project_id)
                    .unwrap_or_else(|| "unknown".into())
            });
            let agent_id = ctx.agent.clone().unwrap_or_else(|| "default".to_string());
            let input = application::session::PauseSessionInput {
                project_id: project_id.to_string(),
                session_id: sid,
                agent_id,
            };
            let result =
                application::session::pause_session(&session_repo, &event_repo, &input, &now);
            render_and_print("session.pause", result, is_json, ctx.quiet)
        }
        SessionCommand::Resume { session_id } => {
            let sid = session_id.clone().unwrap_or_else(|| {
                find_active_session_id(&session_repo, project_id)
                    .unwrap_or_else(|| "unknown".into())
            });
            let agent_id = ctx.agent.clone().unwrap_or_else(|| "default".to_string());
            let input = application::session::ResumeSessionInput {
                project_id: project_id.to_string(),
                session_id: sid,
                agent_id,
            };
            let result =
                application::session::resume_session(&session_repo, &event_repo, &input, &now);
            render_and_print("session.resume", result, is_json, ctx.quiet)
        }
        SessionCommand::End {
            session_id,
            summary,
        } => {
            let sid = session_id.clone().unwrap_or_else(|| {
                find_active_session_id(&session_repo, project_id)
                    .unwrap_or_else(|| "unknown".into())
            });
            let agent_id = ctx.agent.clone().unwrap_or_else(|| "default".to_string());
            let input = application::session::EndSessionInput {
                project_id: project_id.to_string(),
                session_id: sid,
                agent_id,
                summary: summary.clone(),
            };
            let result =
                application::session::end_session(&session_repo, &event_repo, &input, &now);
            render_and_print("session.end", result, is_json, ctx.quiet)
        }
        SessionCommand::Abandon {
            session_id,
            reason: _,
        } => {
            let sid = session_id.clone().unwrap_or_else(|| {
                find_active_session_id(&session_repo, project_id)
                    .unwrap_or_else(|| "unknown".into())
            });
            let agent_id = ctx.agent.clone().unwrap_or_else(|| "default".to_string());
            let input = application::session::EndSessionInput {
                project_id: project_id.to_string(),
                session_id: sid,
                agent_id,
                summary: Some("abandoned".into()),
            };
            let result =
                application::session::end_session(&session_repo, &event_repo, &input, &now);
            render_and_print("session.abandon", result, is_json, ctx.quiet)
        }
    }
}

fn find_active_session_id(
    session_repo: &SqliteSessionRepository,
    project_id: &str,
) -> Option<String> {
    session_repo
        .list(project_id)
        .ok()?
        .into_iter()
        .find(|s| matches!(s.state, carryctx::domain::session::SessionState::Active))
        .map(|s| s.id)
}