;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; html-linechart.scm : generate HTML programmatically, with support
;; for simple style elements.
;; Copyright 2008 Sven Henkel <shenkel@gmail.com>
;;
;; Adapted from html-barchart.scm which is
;; Copyright 2000 Bill Gribble <grib@gnumatic.com>
;;
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation; either version 2 of
;; the License, or (at your option) any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with this program; if not, contact:
;;
;; Free Software Foundation           Voice:  +1-617-542-5942
;; 51 Franklin Street, Fifth Floor    Fax:    +1-617-542-2652
;; Boston, MA  02110-1301,  USA       gnu@gnu.org
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(define <html-linechart>
  (make-record-type "<html-linechart>"
                    '(width
                      height
                      title
                      subtitle
                      x-axis-label
                      y-axis-label
                      col-labels
                      row-labels
                      col-colors
                      legend-reversed?
                      row-labels-rotated?
                      stacked?
                      markers?
                      major-grid?
                      minor-grid?
                      data
                      button-1-line-urls
                      button-2-line-urls
                      button-3-line-urls
                      button-1-legend-urls
                      button-2-legend-urls
                      button-3-legend-urls
                      line-width)))

(define gnc:html-linechart?
  (record-predicate <html-linechart>))

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;  <html-linechart> class
;;  generate the <object> form for a linechart.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

(define gnc:make-html-linechart-internal
  (record-constructor <html-linechart>))

(define (gnc:make-html-linechart)
  (gnc:make-html-linechart-internal -1 -1 #f #f #f #f '() '() '()
                                    #f #f #f #f #f #f '()
                                    #f #f #f #f #f #f -1 ))

(define gnc:html-linechart-data
  (record-accessor <html-linechart> 'data))

(define gnc:html-linechart-set-data!
  (record-modifier <html-linechart> 'data))

(define gnc:html-linechart-width
  (record-accessor <html-linechart> 'width))

(define gnc:html-linechart-set-width!
  (record-modifier <html-linechart> 'width))

(define gnc:html-linechart-height
  (record-accessor <html-linechart> 'height))

(define gnc:html-linechart-set-height!
  (record-modifier <html-linechart> 'height))

(define gnc:html-linechart-x-axis-label
  (record-accessor <html-linechart> 'x-axis-label))

(define gnc:html-linechart-set-x-axis-label!
  (record-modifier <html-linechart> 'x-axis-label))

(define gnc:html-linechart-y-axis-label
  (record-accessor <html-linechart> 'y-axis-label))

(define gnc:html-linechart-set-y-axis-label!
  (record-modifier <html-linechart> 'y-axis-label))

(define gnc:html-linechart-row-labels
  (record-accessor <html-linechart> 'row-labels))

(define gnc:html-linechart-set-row-labels!
  (record-modifier <html-linechart> 'row-labels))

(define gnc:html-linechart-row-labels-rotated?
  (record-accessor <html-linechart> 'row-labels-rotated?))

(define gnc:html-linechart-set-row-labels-rotated?!
  (record-modifier <html-linechart> 'row-labels-rotated?))

(define gnc:html-linechart-stacked?
  (record-accessor <html-linechart> 'stacked?))

(define gnc:html-linechart-set-stacked?!
  (record-modifier <html-linechart> 'stacked?))

(define gnc:html-linechart-markers?
  (record-accessor <html-linechart> 'markers?))

(define gnc:html-linechart-set-markers?!
  (record-modifier <html-linechart> 'markers?))

(define gnc:html-linechart-major-grid?
  (record-accessor <html-linechart> 'major-grid?))

(define gnc:html-linechart-set-major-grid?!
  (record-modifier <html-linechart> 'major-grid?))

(define gnc:html-linechart-minor-grid?
  (record-accessor <html-linechart> 'minor-grid?))

(define gnc:html-linechart-set-minor-grid?!
  (record-modifier <html-linechart> 'minor-grid?))

(define gnc:html-linechart-col-labels
  (record-accessor <html-linechart> 'col-labels))

(define gnc:html-linechart-set-col-labels!
  (record-modifier <html-linechart> 'col-labels))

(define gnc:html-linechart-col-colors
  (record-accessor <html-linechart> 'col-colors))

(define gnc:html-linechart-set-col-colors!
  (record-modifier <html-linechart> 'col-colors))


(define gnc:html-linechart-legend-reversed?
  (record-accessor <html-linechart> 'legend-reversed?))

(define gnc:html-linechart-set-legend-reversed?!
  (record-modifier <html-linechart> 'legend-reversed?))

(define gnc:html-linechart-title
  (record-accessor <html-linechart> 'title))

(define gnc:html-linechart-set-title!
  (record-modifier <html-linechart> 'title))

(define gnc:html-linechart-subtitle
  (record-accessor <html-linechart> 'subtitle))

(define gnc:html-linechart-set-subtitle!
  (record-modifier <html-linechart> 'subtitle))

;; Note: ATM you can specify one url per column, but this url will be
;; used for all of the rows. Otherwise we could have cols*rows urls
;; (quite a lot), but this first requires fixing
;; guppi_line_1_callback() in gnome/gnc-html-guppi.c .
;; FIXME url's haven't been working since GnuCash 1.x
;;       GnuCash 2.x switched from guppy to goffice, which
;;       made it very hard to remain the url functionality
;;       At this point I (gjanssens) is in the process of
;;       moving from goffice to jqplot for our charts
;;       which perhaps may allow urls again in the charts
;;       I'm keeping the parameters below around to remind
;;       us this still has to be investigated again
(define gnc:html-linechart-button-1-line-urls
  (record-accessor <html-linechart> 'button-1-line-urls))

(define gnc:html-linechart-set-button-1-line-urls!
  (record-modifier <html-linechart> 'button-1-line-urls))

(define gnc:html-linechart-button-2-line-urls
  (record-accessor <html-linechart> 'button-2-line-urls))

(define gnc:html-linechart-set-button-2-line-urls!
  (record-modifier <html-linechart> 'button-2-line-urls))

(define gnc:html-linechart-button-3-line-urls
  (record-accessor <html-linechart> 'button-3-line-urls))

(define gnc:html-linechart-set-button-3-line-urls!
  (record-modifier <html-linechart> 'button-3-line-urls))

(define gnc:html-linechart-button-1-legend-urls
  (record-accessor <html-linechart> 'button-1-legend-urls))

(define gnc:html-linechart-set-button-1-legend-urls!
  (record-modifier <html-linechart> 'button-1-legend-urls))

(define gnc:html-linechart-button-2-legend-urls
  (record-accessor <html-linechart> 'button-2-legend-urls))

(define gnc:html-linechart-set-button-2-legend-urls!
  (record-modifier <html-linechart> 'button-2-legend-urls))

(define gnc:html-linechart-button-3-legend-urls
  (record-accessor <html-linechart> 'button-3-legend-urls))

(define gnc:html-linechart-set-button-3-legend-urls!
  (record-modifier <html-linechart> 'button-3-legend-urls))

(define gnc:html-linechart-line-width
  (record-accessor <html-linechart> 'line-width))

(define gnc:html-linechart-set-line-width!
  (record-modifier <html-linechart> 'line-width))

(define (gnc:html-linechart-append-row! linechart newrow)
  (let ((dd (gnc:html-linechart-data linechart)))
    (set! dd (append dd (list newrow)))
    (gnc:html-linechart-set-data! linechart dd)))

(define (gnc:html-linechart-prepend-row! linechart newrow)
  (let ((dd (gnc:html-linechart-data linechart)))
    (set! dd (cons newrow dd))
    (gnc:html-linechart-set-data! linechart dd)))

(define (gnc:html-linechart-append-column! linechart newcol)
  (let ((colnum 0)
        (rownum 0)
        (rows (gnc:html-linechart-data linechart))
        (this-row #f)
        (new-row #f))
    ;; find out how many cols are already there in the deepest row
    (for-each
     (lambda (row)
       (let ((l (length row)))
         (if (> l colnum)
             (set! colnum l))))
     rows)

    ;; append the elements of 'newrow' to the rowumns
    (for-each
     (lambda (newelt)
       ;; find the row, or append one
       (if (not (null? rows))
           (begin
             (set! new-row #f)
             (set! this-row (car rows))
             (if (null? (cdr rows))
                 (set! rows #f)
                 (set! rows (cdr rows))))
           (begin
             (set! new-row #t)
             (set! this-row '())))

       ;; make sure the rowumn is long enough, then append the data
       (let loop ((l (length this-row))
                  (r (reverse this-row)))
         (if (< l colnum)
             (loop (+ l 1) (cons #f r))
             (set! this-row
                   (reverse (cons newelt r)))))
       (if new-row
           (gnc:html-linechart-append-row! linechart this-row)
           (list-set! (gnc:html-linechart-data linechart) rownum this-row))
       (set! rownum (+ 1 rownum)))
     newcol)))

(define (gnc:not-all-zeros data)
  (define (myor list)
    (begin
      (gnc:debug "list" list)
      (if (null? list) #f
	  (or (car list) (myor (cdr list))))))

  (cond ((number? data) (not (= 0 data)))
	((list? data) (myor (map gnc:not-all-zeros data)))
	(else #f)))

(define (gnc:html-linechart-prepend-column! linechart newcol)
  (let ((rows (gnc:html-linechart-data linechart))
        (this-row #f)
        (new-row #f)
        (rownum 0))
    (for-each
     (lambda (elt)
       (if (not (null? rows))
           (begin
             (set! new-row #f)
             (set! this-row (car rows))
             (if (null? (cdr rows))
                 (set! rows #f)
                 (set! rows (cdr rows))))
           (begin
             (set! new-row #t)
             (set! this-row '())))
       (if new-row
           (gnc:html-linechart-append-row! linechart (list elt))
           (list-set! (gnc:html-linechart-data linechart) rownum
                      (cons elt this-row)))
       (set! rownum (+ 1 rownum)))
     newcol)))

(define (gnc:html-linechart-render linechart doc)
  (define (ensure-numeric elt)
    (cond ((number? elt)
           (exact->inexact elt))
          ((string? elt)
           (with-input-from-string elt
             (lambda ()
               (let ((n (read)))
                 (if (number? n) n 0.0)))))
          ((gnc:gnc-numeric? elt)
           (gnc-numeric-to-double elt))
          (#t
           0.0)))

  (define (catenate-escaped-strings nlist)
    (if (not (list? nlist))
        ""
        (with-output-to-string
          (lambda ()
            (for-each
             (lambda (s)
               (let ((escaped
                      (regexp-substitute/global
                       #f " "
                       (regexp-substitute/global
                        #f "\\\\" s
                        'pre "\\\\" 'post)
                       'pre "\\ " 'post)))
                 (display escaped)
                 (display " ")))
             nlist)))))

  (let* ((retval '())
         (push (lambda (l) (set! retval (cons l retval))))
         (title (gnc:html-linechart-title linechart))
         (subtitle (gnc:html-linechart-subtitle linechart))
         (url-1
          (catenate-escaped-strings
           (gnc:html-linechart-button-1-line-urls linechart)))
         (url-2
          (catenate-escaped-strings
           (gnc:html-linechart-button-2-line-urls linechart)))
         (url-3
          (catenate-escaped-strings
           (gnc:html-linechart-button-3-line-urls linechart)))
         (legend-1
          (catenate-escaped-strings
           (gnc:html-linechart-button-1-legend-urls linechart)))
         (legend-2
          (catenate-escaped-strings
           (gnc:html-linechart-button-2-legend-urls linechart)))
         (legend-3
          (catenate-escaped-strings
           (gnc:html-linechart-button-3-legend-urls linechart)))
         (x-label (gnc:html-linechart-x-axis-label linechart))
         (y-label (gnc:html-linechart-y-axis-label linechart))
         (data (gnc:html-linechart-data linechart))
	 (dummy1 (gnc:debug "data " data))
         (row-labels (catenate-escaped-strings
                      (gnc:html-linechart-row-labels linechart)))
         (col-labels (catenate-escaped-strings
                      (gnc:html-linechart-col-labels linechart)))
         (col-colors (catenate-escaped-strings
                      (gnc:html-linechart-col-colors linechart)))
         (line-width (gnc:html-linechart-line-width linechart))
         (series-data-start (lambda (series-index)
                         (push "var d")
                         (push series-index)
                         (push " = [];\n")))
         (series-data-add (lambda (series-index x y)
                         (push (string-append
                               "  d"
                               (number->string series-index)
                               ".push(["
                               (number->string x)
                               ", "
                               (number->string y)
                               "]);\n"))))
         (series-data-end (lambda (series-index label)
                         (push "data.push(d")
                         (push series-index)
                         (push ");\n")
                         (push "series.push({ label: \"")
                         (push (jqplot-escape-string label))
                         (push "\"});\n\n")))
         ; Use a unique chart-id for each chart. This prevents chart
         ; clashed on multi-column reports
         (chart-id (string-append "chart-" (number->string (random 999999)))))
    (if (and (list? data)
             (not (null? data))
             (gnc:not-all-zeros data))
        (begin
            (push (gnc:html-js-include "jqplot/jquery.min.js"))
            (push (gnc:html-js-include "jqplot/jquery.jqplot.js"))
            (push (gnc:html-js-include "jqplot/jqplot.highlighter.js"))
            (push (gnc:html-js-include "jqplot/jqplot.canvasTextRenderer.js"))
            (push (gnc:html-js-include "jqplot/jqplot.canvasAxisTickRenderer.js"))
            (push (gnc:html-css-include "jqplot/jquery.jqplot.css"))

            (push "<div id=\"")(push chart-id)(push "\" style=\"width:")
            (push (gnc:html-linechart-width linechart))
            (push "px;height:")
            (push (gnc:html-linechart-height linechart))
            (push "px;\"></div>\n")
            (push "<script id=\"source\">\n$(function () {")

            (push "var data = [];")
            (push "var series = [];\n")

            (if (and data (list? data))
              (let ((rows (length data))
                    (cols 0))
                (let loop ((col 0) (rowcnt 1))
                  (series-data-start col)
                  (if (list? (car data))
                      (begin 
                        (set! cols (length (car data)))))    
                  (for-each
                    (lambda (row)
                      (series-data-add col rowcnt
                                       (ensure-numeric (list-ref-safe row col)))
                      (set! rowcnt (+ rowcnt 1)))
                    data)
                  (series-data-end col (list-ref-safe (gnc:html-linechart-col-labels linechart) col))
                  (if (< col (- cols 1))
                      (loop (+ 1 col) 1)))))


            (push "var options = {
                   shadowAlpha: 0.07,
                   legend: {
                        show: true,
                        placement: \"outsideGrid\", },
                   seriesDefaults: {
                        lineWidth: ")
            (push (ensure-numeric line-width))
            (push ",
                        showMarker: false,
                   },
                   series: series,
                   axesDefaults: {
                   },        
                   grid: {
                   },
                   axes: {
                       xaxis: {
                           tickRenderer: $.jqplot.CanvasAxisTickRenderer,
                           tickOptions: {
                               angle: -30,
                               fontSize: '10pt',
                           },
                       },
                       yaxis: {
                           autoscale: true,
                       },
                   },
                   highlighter: {
                       tooltipContentEditor: formatTooltip,
                       tooltipLocation: 'ne',
                   }
                };\n")

            (push "  options.stackSeries = ")
            (push (if (gnc:html-linechart-stacked? linechart)
                "true;\n"
                "false;\n"))

            (push "  options.seriesDefaults.showMarker = ")
            (push (if (gnc:html-linechart-markers? linechart)
                "true;\n"
                "false;\n"))

            (push "  options.axesDefaults.drawMajorGridlines = ")
            (push (if (gnc:html-linechart-major-grid? linechart)
                "true;\n"
                "false;\n"))

            (push "  options.axesDefaults.drawMinorGridlines = ")
            (push (if (gnc:html-linechart-minor-grid? linechart)
                "true;\n"
                "false;\n"))

            (if title
              (begin 
                (push "  options.title = \"")
                (push (jqplot-escape-string title))
                (push "\";\n")))

            (if subtitle
              (begin 
                (push "  options.title += \" (")
                (push (jqplot-escape-string subtitle))
                (push ")\";\n")))

            (if (and (string? x-label) (> (string-length x-label) 0))
              (begin 
                (push "  options.axes.xaxis.label = \"")
                (push x-label)
                (push "\";\n")))
            (if (and (string? y-label) (> (string-length y-label) 0))
              (begin 
                (push "  options.axes.yaxis.label = \"")
                (push y-label)
                (push "\";\n")))
            (if (and (string? row-labels) (> (string-length row-labels) 0))
              (begin
                (let ((tick-count 1))
                  (push "  options.axes.xaxis.ticks = [")
                  (for-each 
                    (lambda (val)
                            (push "[")(push tick-count)
                            (push ",\"")(push val)
                            (push "\"],")
                            (set! tick-count (+ tick-count 1)))
                    (gnc:html-linechart-row-labels linechart))
                (push "];\n"))))


            (push "$.jqplot.config.enablePlugins = true;")
            (push "var plot = $.jqplot('")(push chart-id)(push"', data, options);

  function formatTooltip(str, seriesIndex, pointIndex) {
      if (options.axes.xaxis.ticks[pointIndex] !== undefined)
          x = options.axes.xaxis.ticks[pointIndex][1];
      else
          x = pointIndex;
      y = data[seriesIndex][pointIndex][1].toFixed(2);
      return options.series[seriesIndex].label + ' ' + x + '<br><b>' + y + '</b>';
  }\n") 

            (push "});\n</script>")

            (gnc:msg (string-join (reverse (map (lambda (e) (if (number? e) (number->string e) e)) retval)) ""))
            
        )
        (begin
          (gnc:warn "linechart has no non-zero data.")
            " "))
    retval))
