use cm_domain::{AgentId, WorkspaceId};
use sqlx::PgPool;
use uuid::Uuid;

use crate::DbError;

/// A connected app (spec §14 AppConnection). The credential lives in the
/// broker's encrypted store; this row only carries the reference.
#[derive(Debug, Clone, serde::Serialize, serde::Deserialize)]
pub struct AppConnection {
    pub id: Uuid,
    pub workspace_id: Uuid,
    pub agent_id: Option<Uuid>,
    pub provider: String,
    pub auth_type: String,
    pub status: String,
    pub secret_ref: Option<Uuid>,
}

pub async fn insert(
    pool: &PgPool,
    workspace_id: WorkspaceId,
    agent_id: Option<AgentId>,
    provider: &str,
    auth_type: &str,
    secret_ref: Uuid,
) -> Result<AppConnection, DbError> {
    let id = Uuid::now_v7();
    sqlx::query!(
        "INSERT INTO app_connections
            (id, workspace_id, agent_id, provider, auth_type, status, secret_ref)
         VALUES ($1, $2, $3, $4, $5, 'connected', $6)",
        id,
        workspace_id.as_uuid(),
        agent_id.map(|a| a.as_uuid()),
        provider,
        auth_type,
        secret_ref,
    )
    .execute(pool)
    .await?;
    Ok(AppConnection {
        id,
        workspace_id: workspace_id.as_uuid(),
        agent_id: agent_id.map(|a| a.as_uuid()),
        provider: provider.to_owned(),
        auth_type: auth_type.to_owned(),
        status: "connected".into(),
        secret_ref: Some(secret_ref),
    })
}

/// Connections visible to an agent: its own plus workspace-wide ones.
pub async fn list_for_agent(
    pool: &PgPool,
    workspace_id: WorkspaceId,
    agent_id: AgentId,
) -> Result<Vec<AppConnection>, DbError> {
    let rows = sqlx::query_as!(
        AppConnection,
        r#"SELECT id, workspace_id, agent_id, provider, auth_type, status, secret_ref
           FROM app_connections
           WHERE workspace_id = $1 AND (agent_id IS NULL OR agent_id = $2)
             AND status = 'connected'
           ORDER BY created_at"#,
        workspace_id.as_uuid(),
        agent_id.as_uuid(),
    )
    .fetch_all(pool)
    .await?;
    Ok(rows)
}

/// Workspace-wide connections (agent_id IS NULL) — the global /apps page.
pub async fn list_for_workspace(
    pool: &PgPool,
    workspace_id: WorkspaceId,
) -> Result<Vec<AppConnection>, DbError> {
    let rows = sqlx::query_as!(
        AppConnection,
        r#"SELECT id, workspace_id, agent_id, provider, auth_type, status, secret_ref
           FROM app_connections
           WHERE workspace_id = $1 AND agent_id IS NULL AND status = 'connected'
           ORDER BY created_at"#,
        workspace_id.as_uuid(),
    )
    .fetch_all(pool)
    .await?;
    Ok(rows)
}

/// The agent's live connection for one provider, if any.
pub async fn find_provider(
    pool: &PgPool,
    workspace_id: WorkspaceId,
    agent_id: AgentId,
    provider: &str,
) -> Result<Option<AppConnection>, DbError> {
    let row = sqlx::query_as!(
        AppConnection,
        r#"SELECT id, workspace_id, agent_id, provider, auth_type, status, secret_ref
           FROM app_connections
           WHERE workspace_id = $1 AND (agent_id IS NULL OR agent_id = $2)
             AND provider = $3 AND status = 'connected'
           ORDER BY created_at DESC LIMIT 1"#,
        workspace_id.as_uuid(),
        agent_id.as_uuid(),
        provider,
    )
    .fetch_optional(pool)
    .await?;
    Ok(row)
}

/// Fetch a single connection by id, workspace-scoped so cross-tenant reads
/// return NotFound. Used when another table (e.g. repo_connections) needs
/// to resolve the secret_ref of the credential it points at.
pub async fn get(
    pool: &PgPool,
    id: Uuid,
    workspace_id: WorkspaceId,
) -> Result<AppConnection, DbError> {
    let row = sqlx::query_as!(
        AppConnection,
        r#"SELECT id, workspace_id, agent_id, provider, auth_type, status, secret_ref
           FROM app_connections
           WHERE id = $1 AND workspace_id = $2"#,
        id,
        workspace_id.as_uuid(),
    )
    .fetch_optional(pool)
    .await?
    .ok_or(DbError::NotFound)?;
    Ok(row)
}

pub async fn disconnect(pool: &PgPool, id: Uuid) -> Result<(), DbError> {
    let result = sqlx::query!(
        "UPDATE app_connections SET status = 'disconnected' WHERE id = $1",
        id,
    )
    .execute(pool)
    .await?;
    if result.rows_affected() == 0 {
        return Err(DbError::NotFound);
    }
    Ok(())
}