#lang racket

(require web-racket
         racket/runtime-path
         racket/gui
         racket-sprintf
         "utils.rkt"
         "music-library.rkt"
         "translate.rkt"
         "playlist.rkt"
         "player.rkt"
         )
 
(provide
 (all-from-out web-racket)
 rktplayer%
 )

(define-runtime-path rktplayer-start "gui/rktplayer.html")

(define player-menu
  (λ ()
    (menu 'main-menu
          (menu-item 'm-file (tr "File")
                     #:submenu
                     (menu (menu-item 'm-select-library-dir (tr "Select Music Library Folder"))
                           (menu-item 'm-set-lang (tr "Set language"))
                           (menu-item 'm-quit (tr "Quit") #:separator #t)))
          )
    ))

(define rktplayer%
  (class ww-webview%
    (inherit-field settings)
    (super-new
     [html-file rktplayer-start]
     )

    (define closed #f)
    (define el-seeker #f)
    (define el-library #f)
    (define el-playlist #f)
    (define el-at #f)
    (define el-length #f)
    
    (define music-library (send settings get 'music-library (find-system-path 'home-dir)))
    (define current-music-path #f)
    (define playlist #f)

    (define current-at-seconds 0)
    (define current-length-seconds 0)

    
    (define (update-time at-seconds length-seconds)
      (let ((as (inexact->exact (round at-seconds)))
            (ls (inexact->exact (round length-seconds))))
        
        (when (or (not (= current-at-seconds as))
                (not (= current-length-seconds ls)))
          (set! current-at-seconds as)
          (set! current-length-seconds ls)
          (let ((as-str (sprintf "%02d:%02d:%02d"
                                 (quotient as 3600)
                                 (quotient (remainder as 3600) 60)
                                 (remainder (remainder as 3600) 60)))
                (ls-str (sprintf "%02d:%02d:%02d"
                                 (quotient ls 3600)
                                 (quotient (remainder ls 3600) 60)
                                 (remainder (remainder ls 3600) 60)))
                )
            (unless closed
              (send el-at set-inner-html! as-str)
              (send el-length set-inner-html! ls-str)
              (let ((seeker (if (= ls 0)
                                0.0
                                (exact->inexact (/ (* 100 as) ls)))))
                (send el-seeker set! (format "~a" seeker)))
              )
            )
          )
        )
      )

    (define current-track-nr #f)
    (define (update-track-nr nr)
      (unless (eq? playlist #f)
        (displayln (format "update-track-nr ~a" nr))
        (let ((id (λ () (send playlist track-id current-track-nr))) ;string->symbol (format "track-~a" (+ current-track-nr 1)))))
              (ct current-track-nr))

          (displayln "Removing current")
          (unless (eq? current-track-nr #f)
            (displayln (format "current old track: ~a" (id)))
            (let ((el (send this element (id))))
              (send el remove-class! "current")))
        
          (set! current-track-nr nr)

          (displayln "Adding current")
          (unless (eq? current-track-nr #f)
            (displayln (format "current new track: ~a" (id)))
            (let ((el (send this element (id))))
              (send el add-class! "current"))

            (displayln "Getting cover image")
            (let* ((track (send playlist track current-track-nr))
                   (img-file (if (eq? (system-type 'os) 'windows)
                                 "c:/tmp/cover-image"
                                 "/tmp/cover-image"))
                   (stored-file (send track image->file img-file))
                 )
              (displayln (format "image mimetype: ~a" (send track image->mimetype)))
              (unless (eq? stored-file #f)
                (let ((el (send this element 'album-art)))
                  (when (eq? (system-type 'os) 'windows)
                    (set! stored-file (string-append "/" stored-file)))
                  (let ((html (format "<img src=\"~a?~a\" />" stored-file (current-milliseconds))))
                    (send el set-inner-html! html))))
              ;(send el set-attr! 'src stored-file))))
              )
            )
          (displayln" Done updating track")
          )
        )
      )

    (define state #f)
    (define (update-state st)
      (unless (eq? st state)
        (set! state st)
        (if (eq? st 'playing)
          (let ((btn (send this element 'play-img)))
            (send btn set-attr! 'src "buttons/stop.svg"))
          (let ((btn (send this element 'play-img)))
            (send btn set-attr! 'src "buttons/play.svg")))))
    
    (define player (new player%
                        [time-updater update-time]
                        [track-nr-updater update-track-nr]
                        [state-updater update-state]
                        [settings settings]
                        ))
    
    (define inner-html-handlers (make-hash))

    (define/override (html-loaded)
      (super html-loaded)

      (ww-connect 'play play-or-stop)
      (ww-connect 'pause pause)
      (ww-connect 'prev previous-track)
      (ww-connect 'next next-track)
      (ww-connect 'repeat repeat)
      (ww-connect 'volume volume)

      (set! el-seeker (send this element 'seek))
      (displayln (format "el-seeker: ~a" (send el-seeker get)))
      (let ((seek-reactor (make-delayed-reactor 0.3 (λ (percentage) (send this seek-to percentage)))))
        (send el-seeker on-change! seek-reactor))

      (set! el-library (send this element 'library))
      (set! el-playlist (send this element 'tracks))

      (set! el-at (send this element 'time))
      (set! el-length (send this element 'totaltime))

      (send this set-menu! (player-menu))
      (send this connect-menu! 'm-quit (λ () (send this quit)))
      (send this connect-menu! 'm-select-library-dir (λ () (send this select-library)))

      (send this update-library)
      )


    (define/public (update-playlist)
      (let ((html (send playlist to-html)))
        (hash-set! inner-html-handlers (send el-playlist set-inner-html! html)
                   (λ (oke)
                     (when oke
                       (send this bind 'click "table.tracks tr")
                       (send playlist for-each
                             (λ (idx track)
                               (let* ((track-id (send playlist track-id idx))
                                      (el (send this new-element track-id)))
                                 (send el connect 'click
                                       (λ (args)
                                         (send this play-track idx))))
                               )
                             )
                       )
                     )
                   )
        (displayln "Done.")
        (update-track-nr current-track-nr)
        )
      )

    (define/public (scroll-top id)
      (send this exec-js
            (format
             (string-append "let el_id = '~a';"
                            "console.log('id = ' + el_id);"
                            "let el = document.getElementById(el_id);"
                            "console.log(el);"
                            "el.scrollTop = 0;")
             id)))

    (define/public (update-library)
      (when (eq? current-music-path #f)
        (set! current-music-path music-library))
      (let* ((nr 0)
             (l  (filter (λ (r) (music-lib-relevant? (cadr r)))
                         (map (λ (e)
                                (set! nr (+ nr 1))
                                (list (format "row-~a" nr) (build-path current-music-path e) (format "path-~a" nr)))
                              (directory-list current-music-path)))))
        (displayln current-music-path)
        (displayln music-library)
        (unless (equal? (format "~a" current-music-path) (format "~a" music-library))
          (set! l (cons (list "lib-up" "↰" "lib-up") l))
          )
        (let ((html (mktable l 'music-library library-formatter)))
          (let ((handle (send el-library set-inner-html! html)))
            (hash-set! inner-html-handlers handle
                       (λ (oke)
                         (when oke
                           (send this scroll-top 'library) 
                           (send this bind 'click "td.library-entry")
                           (send this bind 'contextmenu "td.library-entry")
                           (for-each (λ (row)
                                       (let ((path-id (string->symbol (caddr row))))
                                         (let ((el (send this new-element path-id)))
                                           (send el connect 'click
                                                 (λ (args)
                                                   (send this path-choosen (cadr row))))
                                           (send el connect 'contextmenu
                                                 (λ (evt)
                                                   (send this context-for-path evt (cadr row))))
                                           )))
                                     l)
                           ))))
          ))
      )

    (define/override (inner-html-set handle oke)
      (ww-debug "inner-html-set called")
      (let ((cb (hash-ref inner-html-handlers handle #f)))
        (ww-debug (format "got cb = ~a for handle ~a" cb handle))
        (when cb
          (hash-remove! inner-html-handlers handle)
          (cb oke)))
      )

    (define/public (path-choosen path)
      (let ((path-part (if (equal? path "↰") ".." (format "~a" path))))
        (let ((npath (if (string=? path-part "..")
                         (build-path current-music-path path-part)
                         path)))
          (when (directory-exists? npath)
            (set! current-music-path (normalize-path npath))
            (send this update-library)
            )
          )
        )
      )

    (define/public (context-for-path evt path)
      (let ((items (list
                    (menu-item 'm-play-this (tr "Play this") #:callback (λ () (send this play-path path))))))
        (when (file-exists? path)
          (set! items (append items
                              (list
                               (menu-item 'm-add-this (tr "Add this") #:callback (λ () (send this add-path path)))))))
        (set! items (append items
                            (list
                             (menu-item 'm-booklet (tr "Open booklet") #:callback (λ () (send this open-booklet path))) ;; todo check if pdf file exists
                             (menu-item 'm-folder  (tr "Open containing folder") #:callback (λ () (send this open-folder path)))
                             )))
        (let* ((mnu (menu 'library-popup items))
               (js-evt (hash-ref evt 'js_evt (make-hash)))
               (clientX (hash-ref js-evt 'clientX 60))
               (clientY (hash-ref js-evt 'clientY 60))
               )
          (send this popup-menu mnu clientX clientY)
          )
        )
      )

    (define/public (play-path path)
      (displayln (format "Playing ~a" path))
      (let ((pl (new playlist% [start-map path])))
        (set! current-track-nr #f)
        (send pl read-tracks)
        (set! playlist pl)
        (send this update-playlist)
        (send player play pl)
        (displayln (format "number of tracks: ~a" (send playlist length)))
        )
      )

    (define/public (add-path path)
      (send playlist add-track path)
      (send this update-playlist)
      )

    (define/public (open-booklet path)
      (displayln (format "Open booklet ~a" path)))

    (define/public (open-folder path)
      (displayln path)
      (let ((folder (if (file-exists? path) (path-only path) path)))
        (open-file-manager folder)))
        ;(shell-execute #f folder #f #f 'sw_show)))

    (define/public (play-or-stop)
      (if (eq? state 'playing)
          (begin
            (send player stop)
            (update-time 0.0 0.0))
          (send player play-track current-track-nr))
      )

    (define/public (play-track idx)
      (send player play-track idx))

    (define/public (pause)
      (send player pause-unpause))

    (define/public (next-track)
      (send player next)
      )

    (define/public (previous-track)
      (send player previous)
      )

    (define/public (repeat)
      (displayln "Repeat")
      )

    (define/public (volume)
      (displayln "Volume")
      )

    (define/public (seek-to percentage)
      (displayln (format "Seeking to percentage: ~a" percentage))
      )

    (define/public (quit)
      (displayln (format "Quitting"))
      (send player quit)
      (set! closed #t)
      (send this close))

    (define/public (select-library)
      ;(set! music-library "c:\\Users\\Hans")
      (let ((handle (send this choose-dir
                       (tr "Choose the folder containing your music library")
                       (if (string? music-library) music-library (path->string music-library))
                       )))
        (displayln (format "Selecting Music Library with handle: ~a" handle))
        )
      )

    (define/override (dir-choosen handle choosen dir)
      (when choosen
        (set! music-library dir)
        (send settings set! 'music-library dir)
        (set! current-music-path #f)
        (send this update-library)))
        

    (begin
      (let ((lang (send settings get 'lang 'en)))
        (displayln (format "RktPlayer started, current language: ~a" lang)))
      )
    )
  )