#! /usr/bin/env racket
#lang racket

(module+ main
  (displayln total-cost))

;; TODO: describe in detail what each field is
(struct item
  (description quantity unit-cost max-lead-days where-to-get note))
(define (make-item
         description quantity unit-cost max-lead-days where-to-get
         [note ""])
  (item description quantity unit-cost max-lead-days where-to-get note))
(define bill-of-materials
  (list
   ;; TODO: add solid core wires
   ;; TODO: add male-female jump wires for connecting sonar sensors
   ;; TODO: add 4x AA batteries
   ;; TODO: add 4x AA battery holder
   ;; TODO: add 3d printer filament cost for wheel, sonar sensor holders,
   ;;       caster standoff
   ;; TODO: add ball caster
   ;; TODO: add angle bracket from evil mad science
   (make-item "Arduino(tm) board"
              1 16.98 8
              (string-append
               "http://www.colorapples.com/2012-new-arduino-uno-r3-board"
               "-atmega328-with-usb-cable-p-89818.html#.U3Lz5nJKyzA")
              "comes with USB A to B cable")
   (make-item "motor" 2 6 7 "https://solarbotics.com/product/gm3/")
   (make-item "transparent 400 point (half) BreadBoard"
              1 5.95 1
              (string-append
               "http://www.jameco.com/webapp/wcs/stores/servlet/"
               "Product_10001_10001_2123830_-1"))
   (make-item "jumper wire female/male" 1/5 6 2
              (string-append "http://www.nexuscyber.com/"
                             "7-premium-40-pin-male-to-female-jumper-wires"))
   (make-item "small squares of double sided tape"
              1/30 12 1
              (string-append
               "http://www.officedepot.com/"
               "a/products/495242/Scotch-Permanent-Double-Sided-Foam-Tape/"))
   ;; TODO: get actual cost of #4-40 phillips 1&1/4" screws
   (make-item "#4-40 Phillips 1 1/4 inch screws"
              3 .1 1
              "olander" "price is an estimate. can pick up in person")
   ;; TODO: get actual cost of #4-40 hex lock nuts
   (make-item "#4-40 hex lock nuts"
              6 .1 1
              "olander" "price is an estimate. can pick up in person")
   ;; TODO: get actual cost of #6-32 3/8" screws
   (make-item "#6-32 button hex head socket 3/8 inch"
              12 .1 1
              "olander" "price is an estimate. can pick up in person")
   (make-item "motor controller"
              1 (/ 5.2 5) 10
              "http://www.ebay.com/itm/like/180976411359?lpid=82")
   (make-item "sonar sensor hc-sr04"
              2 1.39 7
              "http://www.ebay.com/itm/161156018270")))

(define total-cost
  (apply + (for/list ([thing bill-of-materials])
             (* (item-quantity thing) (item-unit-cost thing)))))