;;;
;;; pgloader parameters
;;;
;;; in a separate file to break circular dependencies

(defpackage #:pgloader.params
  (:use #:cl)
  (:export #:*version-string*
           #:*dry-run*
           #:*on-error-stop*
           #:on-error-stop
           #:*self-upgrade-immutable-systems*
	   #:*fd-path-root*
	   #:*root-dir*
	   #:*log-filename*
           #:*summary-pathname*
	   #:*client-min-messages*
	   #:*log-min-messages*
           #:*report-stream*
           #:*pgsql-reserved-keywords*
           #:*identifier-case*
           #:*preserve-index-names*
	   #:*copy-batch-rows*
           #:*copy-batch-size*
           #:*rows-per-range*
           #:*prefetch-rows*
	   #:*pg-settings*
           #:*mysql-settings*
           #:*mssql-settings*
	   #:*default-tmpdir*
	   #:init-params-from-environment
	   #:getenv-default
           #:*context*

           #:+os-code-success+
           #:+os-code-error+
           #:+os-code-error-usage+
           #:+os-code-error-bad-source+
           #:+os-code-error-regress+))

(in-package :pgloader.params)

(defparameter *release* t
  "non-nil when this build is a release build.")

(defparameter *major-version* "3.6")
(defparameter *minor-version* "2")

(defun git-hash ()
  "Return the current abbreviated git hash of the development tree."
  (handler-case
      (let ((git-hash `("git" "--no-pager" "log" "-n1" "--format=format:%h")))
        (multiple-value-bind (stdout stderr code)
            (uiop:run-program git-hash :output :string
                              :directory (asdf:system-source-directory :pgloader))
          (declare (ignore code stderr))
          stdout))
    (condition (e)
      ;; in case anything happen, just return X.Y.Z~devel
      (declare (ignore e))
      (format nil "~a~~devel" *minor-version*))))

(defparameter *version-string*
  (concatenate 'string *major-version* "."
               (if *release* *minor-version* (git-hash)))
  "pgloader version strings, following Emacs versionning model.")

(defvar *self-upgrade-immutable-systems* nil
  "Used for --self-upgrade.")

;;;
;;; We need that to setup our default connection parameters
;;;
(eval-when (:compile-toplevel :load-toplevel :execute)
  (defun getenv-default (name &optional default)
    "Return the value of the NAME variable as found in the environment, or
     DEFAULT if that variable isn't set"
    (or (uiop:getenv name) default)))

(defparameter *dry-run* nil
  "Set to non-nil to only run checks about the load setup.")

(defparameter *on-error-stop* nil
  "Set to non-nil to for pgloader to refrain from handling errors, quitting instead.")

(define-condition on-error-stop ()
  ((on-condition :initarg :on-condition :reader on-error-condition
                 :documentation "Condition that triggered on-error-stop"))
  (:report (lambda (condition stream)
             (format stream
                     "On Error Stop: ~a"
                     (on-error-condition condition)))))

(defparameter *fd-path-root* nil
  "Where to load files from, when loading from an archive or expanding regexps.")

(defparameter *root-dir*
  #+unix (uiop:parse-native-namestring "/tmp/pgloader/")
  #-unix (uiop:merge-pathnames*
          (uiop:make-pathname* :directory '(:relative "pgloader"))
          (uiop:ensure-directory-pathname (getenv-default "Temp")))
  "Top directory where to store all data logs and reject files.")

(defparameter *log-filename*
  (make-pathname :defaults *root-dir*
                 :name "pgloader"
                 :type "log")
  "Main pgloader log file")

(defparameter *summary-pathname* nil "Pathname where to output the summary.")

(defparameter *client-min-messages* :notice)
(defparameter *log-min-messages* :info)

(defparameter *report-stream* *terminal-io*
  "Stream where to format the output stream.")

;;;
;;; When converting from other databases, how to deal with case sensitivity?
;;;
(defvar *pgsql-reserved-keywords* nil
  "We need to always quote PostgreSQL reserved keywords")

(defparameter *identifier-case* :downcase
  "Dealing with source databases casing rules.")

(defparameter *preserve-index-names* nil
  "Dealing with source databases index naming.")

;;;
;;; How to split batches in case of data loading errors.
;;;
(defparameter *copy-batch-rows* 25000
  "How many rows to batch per COPY transaction.")

(defparameter *copy-batch-size* (* 20 1024 1024)
  "Maximum memory size allowed for a single batch.")

(defparameter *prefetch-rows* 100000
  "How many rows do read in advance in the reader queue.")

(defparameter *rows-per-range* 10000
  "How many rows to read in each reader's thread, per SQL query.")

(defparameter *pg-settings* nil "An alist of GUC names and values.")
(defparameter *mysql-settings* nil "An alist of GUC names and values.")
(defparameter *mssql-settings* nil "An alist of GUC names and values.")

;;;
;;; Archive processing: downloads and unzip.
;;;
(defparameter *default-tmpdir*
  (let* ((tmpdir (uiop:getenv "TMPDIR"))
	 (tmpdir (or (and tmpdir (probe-file tmpdir))
                     #+unix #P"/tmp/"
                     #-unix (uiop:ensure-directory-pathname
                             (getenv-default "Temp")))))
    (uiop:ensure-directory-pathname (merge-pathnames "pgloader" tmpdir)))
  "Place where to fetch and expand archives on-disk.")

;;;
;;; Run time initialisation of ENV provided parameters
;;;
;;; The command parser dynamically inspect the environment when building the
;;; connection parameters, so that we don't need to provision for those here.
;;;
(defun init-params-from-environment ()
  "Some of our parameters get their default value from the env. Do that at
   runtime when using a compiled binary."
  (setf *default-tmpdir*
	(fad:pathname-as-directory
	 (getenv-default "TMPDIR" *default-tmpdir*))))

;;;
;;; Run time context to fill-in variable parts of the commands.
;;;
(defvar *context* nil
  "Alist of (names . values) intialized from the environment at run-time,
  and from a --context command line argument, then used in the commands when
  they are using the Mustache templating feature.")

;;;
;;; Some command line constants for OS errors codes
;;;
(defparameter +os-code-success+          0)
(defparameter +os-code-error+            1)
(defparameter +os-code-error-usage+      2)
(defparameter +os-code-error-bad-source+ 4)
(defparameter +os-code-error-regress+    5)