;;; cl-scopes/storage/storage.lisp

;;;; Common layer for SQL storage functionality.

(defpackage :scopes/storage
  (:use :common-lisp)
  (:export #:*db-config* #:*db-engine*
           #:make-engine #:make-storage #:db-params
           #:drop-table))

(in-package :scopes/storage)

(defparameter *db-config* nil)
(defparameter *db-engine* nil)

(defclass db-engine ()
  ((params :initarg :params)
   (config :initarg :config)))

(defun make-engine ()
  (make-engine-db (getf *db-config* :db-type) *db-config*))

(defclass storage ()
  ((engine :initarg :engine)
   (db)
   (schema)))

(defun make-storage ()
  (make-instance 'storage :engine *db-engine*))

(defun db-params (st)
  (slot-value (slot-value st 'engine) 'params))

(defun drop-table (st tn)
  st
  (print (sxql:yield
    (sxql:drop-table tn :if-exists t))))

;; db-driver-specific stuff

(defun make-engine-db (db-type config)
  (let ((params 
          (case db-type 
            (:sqlite3 '(:id-type integer :json-type json))
            (:postgres '(:id-type bigserial :json-type jsonb)))))
    (make-instance 'db-engine :params params :config config)))