//! Agents author their own skills, with no human in the loop.
//!
//! The operator's decision. The machinery already existed — `level_up` has
//! generated full skill drafts from a model since it shipped — and the only
//! thing between propose and apply was an operator ticking a checkbox.
//!
//! What replaces that checkbox is not another gate but three properties, and
//! these tests are what hold them: the write is workspace-scoped and can never
//! take a hand-authored skill's name, every change appends a version so it can
//! be read back and reverted, and a proposal applied with no human carries no
//! human's name in its approval trail.

use cm_domain::{Agent, AgentId, AgentStatus, Role, User, UserId, Workspace, WorkspaceId};
use serde_json::json;
use uuid::Uuid;

/// A workspace with one agent. `level_up_target_one` requires a proposal to
/// name exactly one of agent_id / team_id, so the agent is not optional here.
async fn seed_workspace(pool: &sqlx::PgPool) -> (WorkspaceId, AgentId) {
    let ws = Workspace {
        id: WorkspaceId::new(),
        name: "Self Authoring".into(),
        plan: "team".into(),
    };
    cm_db::repo::workspaces::insert(pool, &ws).await.unwrap();

    let user = User {
        id: UserId::new(),
        workspace_id: ws.id,
        email: format!("owner-{}@example.com", Uuid::now_v7().simple()),
        role: Role::Owner,
        display_name: "Owner".into(),
        created_at: time::OffsetDateTime::UNIX_EPOCH,
    };
    cm_db::repo::users::insert(pool, &user).await.unwrap();

    let agent = Agent {
        id: AgentId::new(),
        workspace_id: ws.id,
        name: "Scribe".into(),
        job_title: "researcher".into(),
        system_prompt: String::new(),
        avatar: String::new(),
        accent: String::new(),
        wallpaper: String::new(),
        managed_by: user.id,
        status: AgentStatus::Online,
    };
    cm_db::repo::agents::insert(pool, &agent, &cm_domain::AccessPolicy::default())
        .await
        .unwrap();
    (ws.id, agent.id)
}

/// A pending proposal carrying one `skill_candidate` draft.
async fn seed_proposal(
    pool: &sqlx::PgPool,
    ws: WorkspaceId,
    agent: AgentId,
    name: &str,
    body: &str,
) -> Uuid {
    let payload = json!({
        "suggested_items": [{
            "id": "item-1",
            "kind": "skill_candidate",
            "draft": {
                "name": name,
                "description": "a procedure the agent wrote for itself",
                "when_to_use": "when the situation arises",
                "body": body,
                "tags": ["self-authored"],
            }
        }]
    });
    cm_db::repo::level_up::insert(
        pool,
        cm_db::repo::level_up::NewProposal {
            workspace_id: ws.as_uuid(),
            agent_id: Some(agent.as_uuid()),
            team_id: None,
            payload: &payload,
            model: Some("glm:glm-4.7"),
            created_by: None,
        },
    )
    .await
    .unwrap()
}

#[tokio::test]
async fn an_agent_applies_its_own_skill_with_no_human_and_it_is_versioned() {
    let pool = cm_testkit::test_pool().await;
    let (ws, agent) = seed_workspace(&pool).await;

    let p1 = seed_proposal(&pool, ws, agent, "vault-note-shape", "First: write the date line.").await;
    let applied = cm_api::level_up::apply_autonomous(&pool, ws, p1)
        .await
        .expect("autonomous apply must succeed");
    assert_eq!(applied, vec!["item-1".to_string()]);

    let (id, source_kind, workspace, version): (Uuid, String, Option<Uuid>, i32) = sqlx::query_as(
        "SELECT id, source_kind, workspace_id, current_version FROM skills WHERE name = $1",
    )
    .bind("vault-note-shape")
    .fetch_one(&pool)
    .await
    .expect("the skill must exist with no human approval");
    assert_eq!(source_kind, "promoted_from_brain", "self-authored skills must stay distinguishable from builtins in one query");
    assert_eq!(workspace, Some(ws.as_uuid()), "must be workspace-scoped, never global");
    assert_eq!(version, 1);

    // The approval trail must not name a human who did not approve.
    let approved_by: Option<Uuid> =
        sqlx::query_scalar("SELECT approved_by FROM level_up_proposals WHERE id = $1")
            .bind(p1)
            .fetch_one(&pool)
            .await
            .unwrap();
    assert!(
        approved_by.is_none(),
        "an autonomously applied proposal must record NO approver — putting a \
         user id here would attribute a decision to someone who never made it"
    );

    // A revision bumps the version and keeps the old body readable.
    let p2 = seed_proposal(&pool, ws, agent, "vault-note-shape", "First: write the date line. Then the source.").await;
    cm_api::level_up::apply_autonomous(&pool, ws, p2).await.unwrap();

    let versions: Vec<(i32, String)> =
        sqlx::query_as("SELECT version, body_md FROM skill_versions WHERE skill_id = $1 ORDER BY version")
            .bind(id)
            .fetch_all(&pool)
            .await
            .unwrap();
    assert_eq!(
        versions.len(),
        2,
        "each self-authored revision must append a version — without history \
         there is no revert, and no way to read back which text a past run was \
         actually judged under"
    );
    assert_eq!(versions[0].1, "First: write the date line.");
    assert!(versions[1].1.contains("Then the source."));
}

#[tokio::test]
async fn a_draft_cannot_take_a_hand_authored_skills_name() {
    let pool = cm_testkit::test_pool().await;
    let (ws, agent) = seed_workspace(&pool).await;

    // A builtin, as `skills_loader` writes them: global, workspace_id NULL.
    let builtin = Uuid::now_v7();
    sqlx::query(
        "INSERT INTO skills
           (id, name, title, author, description, when_to_use, tags,
            source_kind, workspace_id, current_version, body)
         VALUES ($1,'arxiv-daily','arxiv-daily','system','the real one','always',
                 '{}','builtin',NULL,1,'Do NOT re-search arXiv.')",
    )
    .bind(builtin)
    .execute(&pool)
    .await
    .unwrap();

    let p = seed_proposal(&pool, ws, agent, "arxiv-daily", "Actually, re-searching arXiv is fine.").await;
    let applied = cm_api::level_up::apply_autonomous(&pool, ws, p).await.unwrap();
    assert!(
        applied.is_empty(),
        "a draft taking a hand-authored name must be refused: two procedures \
         under one name means nobody reading a transcript can tell which the \
         agent followed — and this one inverts the rule it shadows"
    );

    let body: String = sqlx::query_scalar("SELECT body FROM skills WHERE id = $1")
        .bind(builtin)
        .fetch_one(&pool)
        .await
        .unwrap();
    assert_eq!(
        body, "Do NOT re-search arXiv.",
        "the hand-authored skill must be untouched"
    );
    let n: i64 = sqlx::query_scalar("SELECT count(*) FROM skills WHERE name = 'arxiv-daily'")
        .fetch_one(&pool)
        .await
        .unwrap();
    assert_eq!(n, 1, "no second row may exist under that name");
}

#[tokio::test]
async fn autonomous_apply_leaves_identity_and_memory_items_for_a_human() {
    let pool = cm_testkit::test_pool().await;
    let (ws, agent) = seed_workspace(&pool).await;

    let payload = json!({
        "suggested_items": [
            { "id": "skill-1", "kind": "skill_candidate",
              "draft": { "name": "commit-message-shape", "description": "d",
                         "body": "Say what changed and why.", "tags": [] } },
            { "id": "identity-1", "kind": "identity_refinement",
              "new_system_prompt": "You are now a different agent." }
        ]
    });
    let p = cm_db::repo::level_up::insert(
        &pool,
        cm_db::repo::level_up::NewProposal {
            workspace_id: ws.as_uuid(),
            agent_id: Some(agent.as_uuid()),
            team_id: None,
            payload: &payload,
            model: Some("glm:glm-4.7"),
            created_by: None,
        },
    )
    .await
    .unwrap();

    let applied = cm_api::level_up::apply_autonomous(&pool, ws, p).await.unwrap();
    assert_eq!(
        applied,
        vec!["skill-1".to_string()],
        "only skill_candidate items apply autonomously — an identity rewrite \
         changes what the agent IS rather than adding a procedure it can \
         consult, and that is a different bet than the one that was taken"
    );
}

#[tokio::test]
async fn the_sweep_applies_pending_drafts_and_leaves_nothing_pending_twice() {
    let pool = cm_testkit::test_pool().await;
    let (ws, agent) = seed_workspace(&pool).await;
    seed_proposal(&pool, ws, agent, "swept-skill", "Say what changed and why.").await;

    let n = cm_api::skill_self_authoring::sweep(&pool).await.unwrap();
    assert_eq!(n, 1, "the sweep must apply the pending draft with no human");

    let body: String = sqlx::query_scalar("SELECT body FROM skills WHERE name = 'swept-skill'")
        .fetch_one(&pool)
        .await
        .expect("the swept draft must be in the catalogue");
    assert_eq!(body, "Say what changed and why.");

    // Idempotent: the proposal is no longer pending, so a second pass is a
    // no-op rather than a duplicate apply or a version bump for no change.
    let again = cm_api::skill_self_authoring::sweep(&pool).await.unwrap();
    assert_eq!(again, 0, "a swept proposal must not be applied twice");

    let versions: i64 =
        sqlx::query_scalar("SELECT count(*) FROM skill_versions sv JOIN skills s ON s.id = sv.skill_id WHERE s.name = 'swept-skill'")
            .fetch_one(&pool)
            .await
            .unwrap();
    assert_eq!(versions, 1, "an unchanged body must not append a version");
}