
;; Copyright 2006-2013, Matthew Welland.
;; 
;;  This program is made available under the GNU GPL version 2.0 or
;;  greater. See the accompanying file COPYING for details.
;; 
;;  This program is distributed WITHOUT ANY WARRANTY; without even the
;;  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
;;  PURPOSE.

(use defstruct)

;; (use ssax)
;; (use sxml-serializer)
;; (use sxml-modifications)
;; (use regex)
;; (use srfi-69)
;; (use regex-case)
;; (use posix)
;; (use json)
;; (use csv)
;; (use directory-utils)
(use srfi-18)
(use format)

;; (require-library ini-file)
;; (import (prefix ini-file ini:))

(use sql-de-lite srfi-1 posix regex regex-case srfi-69)
;; (import (prefix sqlite3 sqlite3:))
;; 
(declare (uses configf))
;; (declare (uses tree))
(declare (uses margs))
;; (declare (uses dcommon))
;; (declare (uses launch))
;; (declare (uses gutils))
;; (declare (uses db))
;; (declare (uses synchash))
;; (declare (uses server))
(declare (uses megatest-version))
;; (declare (uses tbd))

(include "megatest-fossil-hash.scm")

;;
;; GLOBALS
;;
(define *verbosity* 1)
(define *logging* #f)

(define *sretrieve:current-tab-number* 0)
(define *args-hash* (make-hash-table))
(define sretrieve:help (conc "Usage: sretrieve [action [params ...]]

  ls                     : list contents of target area
  get <relversion>       : retrieve data for release <version>
    -m \"message\"       : why retrieved?

  log                    : get listing of recent downloads

Part of the Megatest tool suite.
Learn more at http://www.kiatoa.com/fossils/megatest

Version: " megatest-fossil-hash)) ;; "

;;======================================================================
;; RECORDS
;;======================================================================

;;======================================================================
;; DB
;;======================================================================

(define (sretrieve:initialize-db db)
  (for-each
   (lambda (qry)
     (exec (sql db qry)))
   (list 
    "CREATE TABLE IF NOT EXISTS actions
         (id           INTEGER PRIMARY KEY,
          action       TEXT NOT NULL,
          retriever    TEXT NOT NULL,
          datetime     TIMESTAMP DEFAULT (strftime('%s','now')),
          srcpath      TEXT NOT NULL,
          comment      TEXT DEFAULT '' NOT NULL,
          state        TEXT DEFAULT 'new');"
    "CREATE TABLE IF NOT EXISTS bundles
         (id           INTEGER PRIMARY KEY,
          bundle       TEXT NOT NULL,
          release      TEXT NOT NULL,
          status       TEXT NOT NULL,
          event_date   TEXT NOT NULL);"
    )))

(define (sretrieve:register-action db action submitter source-path comment)
  (print "(sretrieve:register-action db " db " action " action " submitter " submitter " source-path " source-path " comment " comment)
  (exec (sql db "INSERT INTO actions (action,retriever,srcpath,comment)
                 VALUES(?,?,?,?)")
	action
	submitter
	source-path
	(or comment "")))

;; (call-with-database
;;  (lambda (db)
;;   (set-busy-handler! db (busy-timeout 10000)) ; 10 second timeout
;;   ...))

;; Create the sqlite db
(define (sretrieve:db-do configdat proc) 
  (let ((path (configf:lookup configdat "database" "location")))
    (if (not path)
	(begin
	  (debug:print 0 "[database]\nlocation /some/path\n\n Is missing from the config file!")
	  (exit 1)))
    (if (and path
	     (directory? path)
	     (file-read-access? path))
	(let* ((dbpath    (conc path "/sretrieve.db"))
	       (writeable (file-write-access? dbpath))
	       (dbexists  (file-exists? dbpath)))
	  (handle-exceptions
	   exn
	   (begin
	     (debug:print 2 "ERROR: problem accessing db " dbpath
			  ((condition-property-accessor 'exn 'message) exn))
	     (exit 1))
	   (call-with-database
            dbpath
	    (lambda (db)
	      ;; (debug:print 0 "calling proc " proc " on db " db)
	      (set-busy-handler! db (busy-timeout 10000)) ;; 10 sec timeout
	      (if (not dbexists)(sretrieve:initialize-db db))
	      (proc db)))))
	(debug:print 0 "ERROR: invalid path for storing database: " path))))

;; copy in file to dest, validation is done BEFORE calling this
;;
(define (sretrieve:get configdat retriever version comment)
  (let* ((base-dir  (configf:lookup configdat "settings" "base-dir"))
	 (datadir   (conc base-dir "/" version)))
    (if (or (not base-dir)
	    (not (file-exists? base-dir)))
	(begin
	  (debug:print 0 "ERROR: Bad configuration! base-dir " base-dir " not found")
	  (exit 1)))
    (print datadir)
    (if (not (file-exists? datadir))
	(begin
	  (debug:print 0 "ERROR: Bad version (" version "), no data found at " datadir "." )
	  (exit 1)))
    
    (sretrieve:db-do
     configdat
     (lambda (db)
       (sretrieve:register-action db "get" retriever datadir comment)))
    (change-directory datadir)
    (process-execute "tar" (append (list "chfv" "-")(filter (lambda (x)
							     (not (member x '("." ".."))))
							   (glob "*" ".*"))))))

(define (sretrieve:validate target-dir targ-mk)
  (let* ((normal-path (normalize-pathname targ-mk))
        (targ-path (conc target-dir "/" normal-path)))
    (if (string-contains   normal-path "..")
    (begin
      (debug:print 0 "ERROR: Path  " targ-mk " resolved outside target area "  target-dir )
      (exit 1)))

    (if (not (string-contains targ-path target-dir))
    (begin
      (debug:print 0 "ERROR: You cannot update data outside " target-dir ".")
      (exit 1)))
    (debug:print 0 "Path " targ-mk " is valid.")   
 ))
;; make directory in dest
;;

(define (sretrieve:mkdir configdat submitter target-dir targ-mk comment)
  (let ((targ-path (conc target-dir "/" targ-mk)))
    
    (if (file-exists? targ-path)
	(begin
	  (debug:print 0 "ERROR: target Directory " targ-path " already exist!!")
	  (exit 1)))
    (sretrieve:db-do
     configdat
     (lambda (db)
       (sretrieve:register-action db "mkdir" submitter targ-mk comment)))
    (let* ((th1         (make-thread
			 (lambda ()
			   (create-directory targ-path #t)
			   (debug:print 0 " ... dir " targ-path " created"))
			 "mkdir thread"))
	   (th2         (make-thread
			 (lambda ()
			   (let loop ()
			     (thread-sleep! 15)
			     (display ".")
			     (flush-output)
			     (loop)))
			 "action is happening thread")))
      (thread-start! th1)
      (thread-start! th2)
      (thread-join! th1))
    (cons #t "Successfully saved data")))

;; create a symlink in dest
;;
(define (sretrieve:ln configdat submitter target-dir targ-link link-name comment)
  (let ((targ-path (conc target-dir "/" link-name)))
    (if (file-exists? targ-path)
	(begin
	  (debug:print 0 "ERROR: target file " targ-path " already exist!!")
	  (exit 1)))
     (if (not (file-exists? targ-link ))
	(begin
	  (debug:print 0 "ERROR: target file " targ-link " does not exist!!")
	  (exit 1)))
 
    (sretrieve:db-do
     configdat
     (lambda (db)
       (sretrieve:register-action db "ln" submitter link-name comment)))
    (let* ((th1         (make-thread
			 (lambda ()
			   (create-symbolic-link targ-link targ-path  )
			   (debug:print 0 " ... link " targ-path " created"))
			 "symlink thread"))
	   (th2         (make-thread
			 (lambda ()
			   (let loop ()
			     (thread-sleep! 15)
			     (display ".")
			     (flush-output)
			     (loop)))
			 "action is happening thread")))
      (thread-start! th1)
      (thread-start! th2)
      (thread-join! th1))
    (cons #t "Successfully saved data")))


;; remove copy of file in dest
;;
(define (sretrieve:rm configdat submitter target-dir targ-file comment)
  (let ((targ-path (conc target-dir "/" targ-file)))
    (if (not (file-exists? targ-path))
	(begin
	  (debug:print 0 "ERROR: target file " targ-path " not found, nothing to remove.")
	  (exit 1)))
    (sretrieve:db-do
     configdat
     (lambda (db)
       (sretrieve:register-action db "rm" submitter targ-file comment)))
    (let* ((th1         (make-thread
			 (lambda ()
			   (delete-file targ-path)
			   (debug:print 0 " ... file " targ-path " removed"))
			 "rm thread"))
	   (th2         (make-thread
			 (lambda ()
			   (let loop ()
			     (thread-sleep! 15)
			     (display ".")
			     (flush-output)
			     (loop)))
			 "action is happening thread")))
      (thread-start! th1)
      (thread-start! th2)
      (thread-join! th1))
    (cons #t "Successfully saved data")))

(define (sretrieve:backup-move path)
  (let* ((trashdir  (conc (pathname-directory path) "/.trash"))
	 (trashfile (conc trashdir "/" (current-seconds) "-" (pathname-file path))))
    (create-directory trashdir #t)
    (if (directory? path)
	(system (conc "mv " path " " trashfile))
	(file-move path trash-file))))


(define (sretrieve:lst->path pathlst)
  (conc "/" (string-intersperse (map conc pathlst) "/")))

(define (sretrieve:path->lst path)
  (string-split path "/"))

(define (sretrieve:pathdat-apply-heuristics configdat path)
  (cond
   ((file-exists? path) "found")
   (else (conc path " not installed"))))

;;======================================================================
;; MISC
;;======================================================================

(define (sretrieve:do-as-calling-user proc)
  (let ((eid (current-effective-user-id))
        (cid (current-user-id)))
    (if (not (eq? eid cid)) ;; running suid
            (set! (current-effective-user-id) cid))
    ;; (debug:print 0 "running as " (current-effective-user-id))
    (proc)
    (if (not (eq? eid cid))
        (set! (current-effective-user-id) eid))))

(define (sretrieve:find name paths)
  (if (null? paths)
      #f
      (let loop ((hed (car paths))
		 (tal (cdr paths)))
	(if (file-exists? (conc hed "/" name))
	    hed
	    (if (null? tal)
		#f
		(loop (car tal)(cdr tal)))))))

(define (sretrieve:stderr-print . args)
  (with-output-to-port (current-error-port)
    (lambda ()
      (apply print args))))

;;======================================================================
;; MAIN
;;======================================================================

(define (sretrieve:load-config exe-dir exe-name)
  (let* ((fname   (conc exe-dir "/." exe-name ".config")))
    ;; (ini:property-separator-patt " *  *")
    ;; (ini:property-separator #\space)
    (if (file-exists? fname)
	;; (ini:read-ini fname)
	(read-config fname #f #t)
	(make-hash-table))))

;; package-type is "megatest", "builds", "kits" etc.
;;
(define (sretrieve:load-packages configdat exe-dir package-type)
  (push-directory exe-dir)
  (let* ((packages-metadir  (configf:lookup configdat "settings" "packages-metadir"))
	 (conversion-script (configf:lookup configdat "settings" "conversion-script"))
	 (upstream-file     (configf:lookup configdat "settings" "upstream-file"))
	 (package-config    (conc packages-metadir "/" package-type ".config")))
    ;; this section here does a timestamp based rebuild of the
    ;;   <packages-metadir>/<package-type>.config file using
    ;;   <upstream-file> as an input
    (if (file-exists? upstream-file)
	(if (or (not (file-exists? package-config)) ;; if not created call the updater, otherwise call only if upstream newer
		(> (file-modification-time upstream-file)(file-modification-time package-config)))
	    (handle-exceptions
	     exn
	     (debug:print 0 "ERROR: failed to run script " conversion-script " with params " upstream-file " " package-config)
	     (let ((pid (process-run conversion-script (list upstream-file package-config))))
	       (process-wait pid)))
	    (debug:print 0 "Skipping update of " package-config " from " upstream-file))
	(debug:print 0 "Skipping update of " package-config " as " upstream-file " not found"))
    ;; (ini:property-separator-patt " *  *")
    ;; (ini:property-separator #\space)
    (let ((res (if (file-exists? package-config)
		   (begin
		     (debug:print 0 "Reading package config " package-config)
		     (read-config package-config #f #t))
		   (make-hash-table))))
      (pop-directory)
      res)))

(define (sretrieve:process-action configdat action . args)
  (let* ((base-dir      (configf:lookup configdat "settings" "base-dir"))
	 (user          (current-user-name))
	 (allowed-users (string-split
			 (or (configf:lookup configdat "settings" "allowed-users")
			     "")))
	 (default-area  (configf:lookup configdat "settings" "default-area"))) ;; otherwise known as the package
    
    (if (not base-dir)
	(begin
	  (debug:print 0 "[settings]\nbase-dir /some/path\n\n Is MISSING from the config file!")
	  (exit)))
    (if (null? allowed-users)
	(begin
	  (debug:print 0 "[setings]\nallowed-users user1 user2 ...\n\n Is MISSING from the config file!")
	  (exit)))
    (if (not (member user allowed-users))
	(begin
	  (debug:print 0 "User \"" (current-user-name) "\" does not have access. Exiting")
	  (exit 1)))
    (case (string->symbol action)
      ((get)
       (if (< (length args) 1)
	   (begin 
	     (debug:print 0 "ERROR: Missing arguments; " (string-intersperse args ", "))
	     (exit 1)))
       (let* ((remargs     (args:get-args args '("-m" "-i" "-package") '() args:arg-hash 0))
              (version     (car args))
	      (msg         (or (args:get-arg "-m") ""))
	      (package-type (or (args:get-arg "-package")
				default-area))
	      (exe-dir     (configf:lookup configdat "exe-info" "exe-dir")))
;;	      (relconfig   (sretrieve:load-packages configdat exe-dir package-type)))

	 (debug:print 0 "retrieving " version " of " package-type " as tar data on stdout")
	 (sretrieve:get configdat user version msg)))
      (else (debug:print 0 "Unrecognised command " action)))))
  
;; ease debugging by loading ~/.dashboardrc - REMOVE FROM PRODUCTION!
;; (let ((debugcontrolf (conc (get-environment-variable "HOME") "/.sretrieverc")))
;;   (if (file-exists? debugcontrolf)
;;       (load debugcontrolf)))

(define (main)
  (let* ((args      (argv))
	 (prog      (car args))
	 (rema      (cdr args))
	 (exe-name  (pathname-file (car (argv))))
	 (exe-dir   (or (pathname-directory prog)
			(sretrieve:find exe-name (string-split (get-environment-variable "PATH") ":"))))
	 (configdat (sretrieve:load-config exe-dir exe-name)))
    ;; preserve the exe data in the config file
    (hash-table-set! configdat "exe-info" (list (list "exe-name" exe-name)
						(list "exe-dir"  exe-dir)))
    (cond
     ;; one-word commands
     ((eq? (length rema) 1)
      (case (string->symbol (car rema))
	((help -h -help --h --help)
	 (print sretrieve:help))
	((list-vars) ;; print out the ini file
	 (map print (sretrieve:get-areas configdat)))
	((ls)
	 (let* ((base-dir (configf:lookup configdat "settings" "base-dir")))
	   (if base-dir
	       (begin
		 (print "Files in " base-dir)
		 (system (conc "ls " base-dir)))
	       (print "ERROR: No base dir specified!"))))
	((log)
	 (sretrieve:db-do configdat (lambda (db)
				     (print "Listing actions")
				     (query (for-each-row
					     (lambda (row)
					       (apply print (intersperse row " | "))))
					    (sql db "SELECT * FROM actions")))))
	(else
	 (print "ERROR: Unrecognised command. Try \"sretrieve help\""))))
     ;; multi-word commands
     ((null? rema)(print sretrieve:help))
     ((>= (length rema) 2)
      (apply sretrieve:process-action configdat (car rema)(cdr rema)))
     (else (debug:print 0 "ERROR: Unrecognised command. Try \"sretrieve help\"")))))

(main)
