#lang racket/gui

(require "interpreter.rkt"
         framework)

; The editor width in pixels
(define EDITOR-WIDTH 600)
(define EDITOR-HEIGHT 600)

; The frame racket/gui base object for the editor
(define f (new frame%
               [label "DrBrainf*ck"]
               [width EDITOR-WIDTH]
               [height EDITOR-HEIGHT]))

; execute-content: -> ProgState
; Returns the last state of execution of the program loaded in the editor
(define (execute-content)
  (execute
   (program->prog-state
    (string->program
     (send editor get-flattened-text)))))

; The run button
(define run-btn (new button% [parent f]
                     [label "Run"]
                     ; Callback procedure for a button click:
                     [callback
                      (lambda (button event)
                        ; empty output text and set color to running
                        (send run-output set-value "")
                        (send run-output set-field-background run-col)

                        ; run the program
                        (define out (prog-state-output (execute-content)))

                        ; set output and change color to ended
                        (send run-output set-value out)
                        (send run-output set-field-background end-col))]))

(define c (new editor-canvas% [parent f]))

; The editor text object
(define text-ln% (text:line-numbers-mixin
                  (editor:standard-style-list-mixin text%)))
(define editor (new text-ln%))

; Show line numbers in editor
(send editor show-line-numbers! #t) 

; Change font to monospace 16
(send editor change-style (make-object style-delta% 'change-size 16))
(send editor change-style (make-object style-delta% 'change-family 'modern))

; Running output color
(define run-col (make-object color% 250 250 200))

; Output completed color
(define end-col (make-object color% 200 250 200))

(define mb (new menu-bar% [parent f]))
(define m-file (new menu% [label "File"] [parent mb]))
(define m-edit (new menu% [label "Edit"] [parent mb]))

; The run output text object
(define run-output (new text-field%
                        [style (list 'multiple 'vertical-label)]
                        [label "Execution output:"]
                        [parent f]))
  
(define mi-open
  (new menu-item%
       [label "Open"]
       [parent m-file]
       [callback
        (lambda (i e)
          (define path (get-file #f f))
          (when path
            (send editor load-file path 'text)))]
       [shortcut #\o]
       [shortcut-prefix '(ctl)]))
  
(define mi-save
  (new menu-item%
       [label "Save"]
       [parent m-file]
       [callback
        (lambda (i e)
          (send editor save-file #f 'text))]
       [shortcut #\s]
       [shortcut-prefix '(ctl)]))
  
(append-editor-operation-menu-items m-edit #f)
(send editor set-max-undo-history 100)
(send c set-editor editor)
(send f show #t)