//! Persistence for deployed teams — a baseline topology staffed with real
//! workspace claws. `teams` holds the topology graph; `team_members` is the
//! durable node→claw binding.

use cm_domain::WorkspaceId;
use serde_json::Value;
use sqlx::PgPool;
use time::OffsetDateTime;
use uuid::Uuid;

use crate::DbError;

/// A team row summary (list view).
pub struct TeamSummary {
    pub id: Uuid,
    pub name: String,
    pub kind: String,
    pub status: String,
    pub created_at: OffsetDateTime,
}

/// A full team (graph + metadata).
pub struct Team {
    pub id: Uuid,
    pub name: String,
    pub kind: String,
    pub graph: Value,
    pub status: String,
    pub created_at: OffsetDateTime,
}

/// A node→claw binding within a team.
pub struct TeamMember {
    pub node_id: String,
    pub claw_id: Uuid,
    pub role: String,
}

/// Insert a team (the topology graph). Members are added separately.
/// Lifecycle defaults to `permanent`; use `insert_ephemeral_team` for the
/// scheduled / triggered flows.
pub async fn insert_team(
    pool: &PgPool,
    id: Uuid,
    workspace_id: WorkspaceId,
    name: &str,
    kind: &str,
    graph: &Value,
) -> Result<(), DbError> {
    insert_team_with_lifecycle(pool, id, workspace_id, name, kind, graph, "permanent").await
}

/// Insert a team with an explicit `lifecycle` (`permanent` | `ephemeral`).
/// Ephemeral teams are torn down after the last in-flight run terminates —
/// see cm-api::topology_worker::maybe_teardown_ephemeral_team.
pub async fn insert_team_with_lifecycle(
    pool: &PgPool,
    id: Uuid,
    workspace_id: WorkspaceId,
    name: &str,
    kind: &str,
    graph: &Value,
    lifecycle: &str,
) -> Result<(), DbError> {
    sqlx::query!(
        "INSERT INTO teams (id, workspace_id, name, kind, graph, lifecycle)
         VALUES ($1, $2, $3, $4, $5, $6)",
        id,
        workspace_id.as_uuid(),
        name,
        kind,
        graph,
        lifecycle,
    )
    .execute(pool)
    .await?;
    Ok(())
}

/// Rebuild a team's topology (kind + graph) in place; node→claw bindings (which
/// key off stable node ids `n0..`) are left untouched. Non-macro query so it
/// needs no offline sqlx cache entry.
pub async fn set_topology(
    pool: &PgPool,
    id: Uuid,
    workspace_id: WorkspaceId,
    kind: &str,
    graph: &Value,
) -> Result<(), DbError> {
    let res =
        sqlx::query("UPDATE teams SET kind = $3, graph = $4 WHERE id = $1 AND workspace_id = $2")
            .bind(id)
            .bind(workspace_id.as_uuid())
            .bind(kind)
            .bind(graph)
            .execute(pool)
            .await?;
    if res.rows_affected() == 0 {
        return Err(DbError::NotFound);
    }
    Ok(())
}

/// Delete a team and its node→claw bindings.
/// Rename a team in-place. Only the display name changes; the topology
/// graph + member bindings are untouched.
pub async fn rename_team(
    pool: &PgPool,
    id: Uuid,
    workspace_id: WorkspaceId,
    name: &str,
) -> Result<(), DbError> {
    let res = sqlx::query("UPDATE teams SET name = $3 WHERE id = $1 AND workspace_id = $2")
        .bind(id)
        .bind(workspace_id.as_uuid())
        .bind(name)
        .execute(pool)
        .await?;
    if res.rows_affected() == 0 {
        return Err(DbError::NotFound);
    }
    Ok(())
}

pub async fn delete_team(
    pool: &PgPool,
    id: Uuid,
    workspace_id: WorkspaceId,
) -> Result<(), DbError> {
    sqlx::query("DELETE FROM team_members WHERE team_id = $1")
        .bind(id)
        .execute(pool)
        .await?;
    let res = sqlx::query("DELETE FROM teams WHERE id = $1 AND workspace_id = $2")
        .bind(id)
        .bind(workspace_id.as_uuid())
        .execute(pool)
        .await?;
    if res.rows_affected() == 0 {
        return Err(DbError::NotFound);
    }
    Ok(())
}

/// Bind a claw to a topology node within a team.
pub async fn add_member(
    pool: &PgPool,
    team_id: Uuid,
    node_id: &str,
    claw_id: Uuid,
    role: &str,
) -> Result<(), DbError> {
    sqlx::query!(
        "INSERT INTO team_members (team_id, node_id, claw_id, role)
         VALUES ($1, $2, $3, $4)",
        team_id,
        node_id,
        claw_id,
        role,
    )
    .execute(pool)
    .await?;
    Ok(())
}

/// The most recent teams for a workspace, newest first.
pub async fn list_for_workspace(
    pool: &PgPool,
    workspace_id: WorkspaceId,
    limit: i64,
) -> Result<Vec<TeamSummary>, DbError> {
    let rows = sqlx::query!(
        "SELECT id, name, kind, status, created_at FROM teams
         WHERE workspace_id = $1 ORDER BY created_at DESC LIMIT $2",
        workspace_id.as_uuid(),
        limit,
    )
    .fetch_all(pool)
    .await?;
    Ok(rows
        .into_iter()
        .map(|r| TeamSummary {
            id: r.id,
            name: r.name,
            kind: r.kind,
            status: r.status,
            created_at: r.created_at,
        })
        .collect())
}

/// A single team, workspace-scoped.
pub async fn get_team(pool: &PgPool, id: Uuid, workspace_id: WorkspaceId) -> Result<Team, DbError> {
    let row = sqlx::query!(
        "SELECT id, name, kind, graph, status, created_at FROM teams
         WHERE id = $1 AND workspace_id = $2",
        id,
        workspace_id.as_uuid(),
    )
    .fetch_optional(pool)
    .await?
    .ok_or(DbError::NotFound)?;
    Ok(Team {
        id: row.id,
        name: row.name,
        kind: row.kind,
        graph: row.graph,
        status: row.status,
        created_at: row.created_at,
    })
}

/// Distinct agent ids bound to a team via `team_members`. Used by the
/// cascade-reap path so deleting a team also purges the agents inside it.
pub async fn agents_of_team(pool: &PgPool, team_id: Uuid) -> Result<Vec<Uuid>, DbError> {
    let rows = sqlx::query!(
        "SELECT DISTINCT claw_id FROM team_members WHERE team_id = $1",
        team_id,
    )
    .fetch_all(pool)
    .await?;
    Ok(rows.into_iter().map(|r| r.claw_id).collect())
}

/// The node→claw bindings for a team.
pub async fn members_for_team(pool: &PgPool, team_id: Uuid) -> Result<Vec<TeamMember>, DbError> {
    let rows = sqlx::query!(
        "SELECT node_id, claw_id, role FROM team_members WHERE team_id = $1 ORDER BY node_id",
        team_id,
    )
    .fetch_all(pool)
    .await?;
    Ok(rows
        .into_iter()
        .map(|r| TeamMember {
            node_id: r.node_id,
            claw_id: r.claw_id,
            role: r.role,
        })
        .collect())
}