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(use-modules
 (srfi srfi-1) ;; map/fold
 (srfi srfi-19) ;; date/time
 (srfi srfi-26) ;; partial application
 (srfi srfi-69) ;; hash-table
 (sxml simple)
 (ice-9 match)
 (data-source-git)
 (data-source-rss)
 (generate-data-svg)
 (svg-template-gregorian)
 (svg-template-discord)
 (svg-template-french-revolutionary))

(define (write-svg name css-files data)
  (with-output-to-file name
    (lambda ()
      (for-each (lambda (css-file)
                  (display (string-append
                            "<?xml-stylesheet type=\"text/css\" href=\""
                            css-file
                            "\" ?>")))
                css-files)
      (sxml->xml data))))

(define (parse-arguments args)
  (define program (car args))
  (define rest (cdr args))
  (if (null? rest)
      default-arguments
      (parse-arguments-itr (car rest) (cdr rest) default-arguments)))
(define (parse-arguments-itr arg rest acc)
  (define (next-arg) (if (null? rest) #f (car rest)))
  (define (next-rest) (if (null? rest) '() (cdr rest)))
  (define (next-arg2) (if (null? (next-rest)) #f (car (next-rest))))
  (define (next-rest2) (if (null? (next-rest)) '() (cdr (next-rest))))
  (define (get-acc key)
    (define result (assoc key acc))
    (if result (cdr result) #f))
  (define (continue new-arg new-rest new-acc)
    (if (not new-arg)
        new-acc
        (parse-arguments-itr new-arg new-rest new-acc)))
  (match arg
    ("--year"
     (continue (next-arg2)
               (next-rest2)
               (cons (cons 'year (string->number (next-arg)))
                     acc)))
    ("--output"
     (continue (next-arg2)
               (next-rest2)
               (cons (cons 'output (next-arg))
                     acc)))
    ("-o"
     (continue (next-arg2)
               (next-rest2)
               (cons (cons 'output (next-arg))
                     acc)))
    ("--rss-file"
     (continue (next-arg2)
               (next-rest2)
               (cons (cons 'rss-files
                           (cons (next-arg) (assoc-ref acc 'rss-files)))
                     acc)))
    ("--calendar"
     (continue (next-arg2)
               (next-rest2)
               (cons (cons 'calendar
                           (cons (string->symbol (next-arg))
                                 (get-acc 'directories)))
                     acc)))
    ("--css"
     (continue (next-arg2)
               (next-rest2)
               (cons (cons 'css
                           (cons (next-arg)
                                 (get-acc 'directories)))
                     acc)))
    ("--help" (display "Exports your git/rss activity for a year into a svg.

\x1B[1mHOW TO USE:\x1B[0m
    git-log-calendar [list of git project directories, ...]
                     [--year 1984]
                     # creates calendar for the gregorian year 1984

                     # By default gregorian, french-revolutionary and
                       discordian svgs are generated to counterbalance
                       the illuminati at redhat who removed ddate
                       from util-linux.
                       Use --calendar gregorian to only create one svg.
                     [--calendar discordian]
                     [--calendar gregorian]
                     [--calendar french]
                     [--output | -o out.svg] # only works for one calendar atm
                     # The svg will include this css
                     [--css svg.css]
\x1B[1mEXAMPLE:\x1B[0m
    ./git-log-calendar ~/some-repo/ ~/some-other-repo/
    ./git-log-calendar .
    ./git-log-calendar ~/some-repo/.git
    ./git-log-calendar ~/some-repo/ --css ../css/svg.css --year 2015\\
                       --output /tmp/greg --calendar gregorian

\x1B[1mSEE ALSO\x1B[0m
       ddate(1),
       \x1B[3mMalaclypse the Younger\x1B[0m, \x1B[4mPrincipia Discordia, Or How I Found Goddess\x1B[0m
                               \x1B[4mAnd What I Did To Her When I Found Her\x1B[0m
       \x1B[1mRobert Shea\x1B[0m and \x1B[1mRobert Anton Wilson\x1B[0m, The \x1B[2m\x1B[4m\x1B[53mIlluminatus!\x1B[0m Trilogy
")
     (exit 2))
    (else (continue (next-arg)
                    (next-rest)
                    (cons (cons 'directories
                                (cons arg
                                      (get-acc 'directories)))
                          acc)))))

(define default-arguments
  `((directories . ())
    (rss-files . ())
    (css . ())))

(define (main args)
  (define arguments (parse-arguments args))
  (define (get-arg key)
    (define result (assoc key arguments))
    (if result (cdr result) #f))
  (define rss-files (get-arg 'rss-files))
  (define directories (get-arg 'directories))
  (define year-date (if (get-arg 'year)
                        (make-date 0 0 0 0 0 1 (get-arg 'year) 0)
                        (current-date)))
  (define year (date-year year-date))
  (define days (fold (cut generate-days-table year <> <>)
                     (make-hash-table)
                     (append (map (lambda (d) (data-source-git year d)) directories)
                             (map (lambda (f) (data-source-rss year f)) rss-files))))
  (define fyear (gdate->fyear year-date))
  (define gyear-name (number->string year))
  (define dyear-name (number->string (+ year 1166)))
  (define fyear-name (number->string fyear))
  (define goutput (or (get-arg 'output)
                      (string-append "img/git-activity-" gyear-name ".svg")))
  (define doutput (or (get-arg 'output)
                      (string-append "img/git-discord-" dyear-name ".svg")))
  (define foutput (or (get-arg 'output)
                      (string-append "img/git-revolutionary-" fyear-name ".svg")))
  (define create-all-outputs? (not (get-arg 'calendar)))

  (when (null? directories)
    (display "Error: Please call with a list of repo directories\n")
    (display "Call ./git-log-calendar --help for more info")
    (display "Example:\n")
    (display "./git-log-calendar . ~/some-repo/ ~/some-other-repo/.git\n")
    (exit 1))

  (when (not (file-exists? "img/"))
    (mkdir "img"))

  (when (or create-all-outputs?
            (member 'gregorian (get-arg 'calendar))
            (member 'greg (get-arg 'calendar)))
    (write-svg goutput
               (get-arg 'css)
               (generate-svg svg-template-gregorian year days)))
  (when (or create-all-outputs?
            (member 'discordian (get-arg 'calendar))
            (member 'disc (get-arg 'calendar)))
    (write-svg doutput
               (get-arg 'css)
               (generate-svg svg-template-discord year days)))
  (when (or create-all-outputs?
            (member 'french (get-arg 'calendar))
            (member 'fr (get-arg 'calendar)))
    (write-svg foutput
               (get-arg 'css)
               (generate-svg svg-template-french-revolutionary year-date days))))