;;; -*- scheme -*-

;;; Copyright © 2019 - 2021 Jakob L. Kreuze <zerodaysfordays@sdf.org>
;;;
;;; 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 3 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, see
;;; <http://www.gnu.org/licenses/>.

(use-modules (ice-9 match)
             (ice-9 rdelim)
             (ice-9 popen)
             (jakob theme)
             (jakob utils sxml)
             (srfi srfi-1)
             (srfi srfi-19)
             (sxml simple))

(define %software-projects
  `(("Kona" rust
     "https://git.sr.ht/~jakob/kona"
     "./repositories/kona/"
     ("Lightweight, self-hosted tagged image gallery."))
    ("zerodaysfordays" ebuild
     "https://git.sr.ht/~jakob/zerodaysfordays"
     "./repositories/zerodaysfordays/"
     ("My personal Gentoo overlay."))
    ("My Website" scheme
     "https://git.sr.ht/~jakob/blog"
     "../"
     ("The website you're reading right now. Effectively a massive 'contrib'
module for " ,(hyperlink "https://dthompson.us/projects/haunt.html" "Haunt")
"."))))

(define %abandoned-software-projects
  `(("ox-haunt" elisp
     "https://git.sr.ht/~jakob/ox-haunt"
     "./repositories/ox-haunt/"
     ("Haunt-flavored HTML backend for the Org export engine")
     ,(string->date "Apr 05 2020" "~b ~e ~Y"))
    ("Mines" kotlin
     "https://git.sr.ht/~jakob/mines"
     "./repositories/mines/"
     ("Android implementation of the classic video game \"Minesweeper\".")
     ,(string->date "Apr 12 2019" "~b ~e ~Y"))
    ("Slime the World" fennel
     "https://git.sr.ht/~jakob/slime-the-world"
     "./repositories/slime-the-world/"
     ("My entry for the 2018 Autumn Lisp Game Jam; a game about covering everything in slime.")
     ,(string->date "Jan 01 2019" "~b ~e ~Y"))
    ("Rebuild" rust
     "https://git.sr.ht/~jakob/rebuild"
     "./repositories/rebuild/"
     ("An attempt at reimplementing Ken Silverman's Build engine, with the goal of being modular enough to host a modern Blood source port.")
     ,(string->date "Sep 23 2018" "~b ~e ~Y"))
    ("wildmidi" rust
     "https://git.sr.ht/~jakob/wildmidi"
     "./repositories/wildmidi/"
     ("A simple [Rust] wrapper around the WildMIDI software synthesizer library.")
     ,(string->date "Aug 31 2018" "~b ~e ~Y"))
    ("Duke on FluidSynth" c++
     "https://git.sr.ht/~jakob/duke-on-fluidsynth"
     "./repositories/duke-on-fluidsynth/"
     ("Experimental FluidSynth MIDI driver for EDuke32.")
     ,(string->date "Apr 13 2018" "~b ~e ~Y"))
    ("Hypodermic" python
     "https://git.sr.ht/~jakob/hypodermic"
     "./repositories/hypodermic/"
     ("Proof-of-concept shared object injector that will eventually be integrated with PINCE.")
     ,(string->date "Jan 22 2018" "~b ~e ~Y"))
    ("skullfuck" c
     "https://git.sr.ht/~jakob/skullfuck"
     "./repositories/skullfuck/"
     ("Optimizing compiler for Brainfuck, contained in a single C source file.")
     ,(string->date "Jun 21 2017" "~b ~e ~Y"))
    ("Nekopack" c
     "https://git.sr.ht/~jakob/nekopack"
     "./repositories/nekopack/"
     ("Tool for extracting game data from Nekopara's XP3 archives.")
     ,(string->date "Dec 01 2017" "~b ~e ~Y"))))

(define %software-contributions
  `(("GNU Guix" scheme
     "https://guix.gnu.org"
     "./repositories/guix"
     ("Functional cross-platform package manager and a tool to instantiate and manage
Unix-like operating systems, based on the Nix package manager.")
     ,(string->date "Dec 28 2019" "~b ~e ~Y"))
    ("Radare2" c
     "https://www.radare.org/r/"
     "./repositories/radare2"
     ("UNIX-like reverse engineering framework and command-line tools.")
     ,(string->date "Nov 09 2018" "~b ~e ~Y"))
    ("Haiku" c++
     "https://www.haiku-os.org/"
     "./repositories/haiku"
     ("The Haiku operating system.")
     ,(string->date "Jun 31 2019" "~b ~e ~Y"))
    ("PINCE" python
     "https://github.com/korcankaraokcu/PINCE"
     "./repositories/pince"
     ("A reverse engineering tool, comparable to Cheat Engine for GNU/Linux. I still
maintain the Arch Linux package, which is unfortunate, as I no longer use Arch
Linux.")
     ,(string->date "Apr 15 2018" "~b ~e ~Y"))))

(define %ctf-teams
  `((2016
     "Shaq Overflow"
     "https://ctftime.org/team/28150"
     "https://ctftime.org/media/cache/81/35/813561ed466cd4ea5303de2cb394a5f5.png"
     178
     3244)
    (2017
     "Shaq Overflow"
     "https://ctftime.org/team/28150"
     "https://ctftime.org/media/cache/81/35/813561ed466cd4ea5303de2cb394a5f5.png"
     349
     12096)
    (2017
     "0xBU"
     "https://ctftime.org/team/22064"
     "https://ctftime.org/media/cache/1c/a8/1ca85a2b2f131b0c3b73439b06f5f9dc.png"
     25
     216)
    (2018
     "0xBU"
     "https://ctftime.org/team/22064"
     "https://ctftime.org/media/cache/1c/a8/1ca85a2b2f131b0c3b73439b06f5f9dc.png"
     29
     267)
    (2019
     "0x7C_Jake"
     "https://ctftime.org/team/77995"
     "https://ctftime.org/media/cache/05/52/05526f1aa281e0b1e6792ffaaa08cd2c.png"
     "Unranked"
     "Unranked")
    (2019
     "SavedByTheShell"
     "https://ctftime.org/team/78233"
     "https://ctftime.org/media/cache/37/37/37370fff4b9f8c907a4fee83fb6950bf.png"
     102
     942)
    (2020
     "SavedByTheShell"
     "https://ctftime.org/team/78233"
     "https://ctftime.org/media/cache/37/37/37370fff4b9f8c907a4fee83fb6950bf.png"
     63
     492)))

(define (lang-to-button lang)
  (case lang
    ((c)      '(button (@ (class "lang-c"))      "C"))
    ((c++)    '(button (@ (class "lang-cpp"))    "C++"))
    ((python) '(button (@ (class "lang-python")) "Python"))
    ((rust)   '(button (@ (class "lang-rust"))   "Rust"))
    ((kotlin) '(button (@ (class "lang-kotlin")) "Kotlin"))
    ((fennel) '(button (@ (class "lang-fennel")) "Fennel"))
    ((elisp)  '(button (@ (class "lang-elisp"))  "Elisp"))
    ((scheme) '(button (@ (class "lang-scheme")) "Scheme"))
    ((ebuild) '(button (@ (class "lang-ebuild")) "Ebuild"))))

(define (date-of-first-commit repository-path)
    "Return the date of the first commit in `repository-path'."
    (let* ((command (format #f "bash -c 'cd \"~a\"; git log --author=\"[Jj]akob\" --reverse --pretty=\"format:%at\" | head -n 1'"
                            repository-path))
           (port (open-input-pipe command))
           (str  (read-line port)))
      (close-pipe port)
      (time-utc->date (make-time 'time-utc 0 (string->number str)))))

(define* (bin-commit-counts repository-path #:key start end)
  "Count commits per month-long interval between `start' and `end'.

Take `end' to be `(current-date)' if unspecified. Similarly, take `start' to be
the date of the first commit in the repository if unspecified."
  (define (date-in-past date)
    "Return `#t' iff `date' is in the past.

If `end' is specified, return `#t' iff `date' is prior to `end'."
    (time<=? (date->time-utc date)
             (if end
                 (date->time-utc end)
                 (current-time 'time-utc))))
  (define (increment-date-by-month date)
    "Return a SRFI-19 date one month in the future from `date'."
    ;; Special handling for leap years.
    (define (days-in-month date)
      (if (= 2 (date-month date))
          (if (and (or (zero? (remainder (date-year date) 400))
                       (positive? (remainder (date-year date) 100)))
                   (zero? (remainder (date-year date) 4)))
              29
              28)
          (cadr
           (assoc (date-month date)
                  '((1 31) (3 31) (4 30) (5 31) (6 30) (7 31)
                    (8 31) (9 30) (10 31) (11 30) (12 31))))))
    (time-utc->date
     (add-duration (date->time-utc date)
                   (make-time 'time-duration 0 (* 60 60 24
                                                  (days-in-month date))))))
  (define (count-commits-in-month start-date)
    "Return the number of commits in the month starting on `start-date'."
    (let* ((end-date (increment-date-by-month start-date))
           (command (format #f "bash -c 'cd \"~a\"; git rev-list --count HEAD --author=\"[Jj]akob\" --since=\"~a\" --before=\"~a\"'"
                            repository-path
                            (date->string start-date "~b ~e ~Y")
                            (date->string end-date "~b ~e ~Y"))))
      (let* ((port (open-input-pipe command))
             (str  (read-line port)))
        (close-pipe port)
        str)))
  (let loop ((bin '())
             (date (or start (date-of-first-commit repository-path))))
    (if (date-in-past date)
        (loop (cons (count-commits-in-month date) bin)
              (increment-date-by-month date))
        (reverse! (map string->number bin)))))

(define* (render-histogram summary #:key (width 60) (height 25))
  "Render a list of intervals as an SVG histogram."
  ;; Assuming an interval lasts a month, I'm lucky to get 50 commits in.
  (define max-commits-per-interval 50)
  (define (format-shapes shapes)
    `(svg (@ (xmlns "http://www.w3.org/2000/svg")
             (version "1.1")
             (width  ,(number->string width))
             (height ,(number->string height)))
          ;; Border for the histogram.
          (rect (@ (x "0") (y "0") (width ,width) (height ,height)
                   (stroke "black") (stroke-width "1")
                   (fill "transparent")))
          ,@shapes))
  (let* ((summary (if (> (length summary) 30)
                      (take-right summary 30)
                      summary))
         (content-width (* 2 (length summary)))
         (right-pad (max (- width content-width) 0))
         (upper-bound (max max-commits-per-interval
                           (apply max summary))))
    (format-shapes
     (map (match-lambda
            ((commit-count i)
             `(line (@ (stroke "black")
                       (stroke-width "1")
                       ;; Separate strokes by 2px and pad to the right.
                       (x1 ,(+ right-pad (* i 2)))
                       (x2 ,(+ right-pad (* i 2)))
                       (y1 ,height)
                       (y2 ,(exact->inexact
                             (- height
                                (* (/ commit-count upper-bound)
                                   height))))))))
          (zip summary (iota (length summary)))))))

(define* (project name lang url repository-path description #:optional end-date)
  (let ((start-date (date-of-first-commit repository-path)))
    `(tr (td ,(hyperlink url name))
         (td ,(lang-to-button lang))
         (td ,(render-histogram (bin-commit-counts repository-path #:end end-date)))
         (td ,(if end-date
                  (format #f "~a - ~a"
                          (date->string start-date "~b ~e ~Y")
                          (date->string end-date "~b ~e ~Y"))
                  (format #f "~a - Present" (date->string start-date "~b ~e ~Y"))))
         (td (p ,@description)))))

(define* (ctf-team year name url icon-url country-rating global-rating)
  `(tr (td ,year)
       (td (img (@ (src ,icon-url) (alt "Team logo."))))
       (td ,(hyperlink url name))
       (td ,country-rating)
       (td ,global-rating)))

(define* (project-section title format items #:key class subtitle folded)
  #<(section
    (h4 ,title)
    ,(when subtitle `(p ,subtitle))
    (table (@ (class ,(or class "project-section")))
     (tbody
      ,@(map (lambda (args) (apply format args)) items)))))

(theme
 #:title "About"
 #:content
 `((h2 "Hey.")
   (ul (@ (class "horizontal-list"))
       (li "Email: " (strong "zerodaysfordays at ‌​‌‌‌​‌‌‍‌​‌‌​​​​‍‌​‌‌​​​‌‍‌‌​‌‌​​​‍‌​‌​‌​‌‌‍‌‌​‌‌‌‌‌‍‌​‌‌‌​​‌‍‌​‌​‌​‌​‍‌​‌‌‌‌​​‍‌​‌‌​‌​​‍‌​‌‌​‌‌​‍‌​‌‌​​​‌‍‌​‌‌‌​​​‍‌‌​‌‌‌‌‌‍‌​‌​‌‌​​‍‌​‌​‌‌‌‌‍‌​‌‌‌‌‌​‍‌​‌‌​​‌​‍‌‌​‌‌‌‌‌‍‌​‌‌​​‌​‍‌​‌‌‌​‌​sdf.org"))
       (li "XMPP: " (strong "jakob at ‌​‌‌‌​‌‌‍‌​‌‌​​​​‍‌​‌‌​​​‌‍‌‌​‌‌​​​‍‌​‌​‌​‌‌‍‌‌​‌‌‌‌‌‍‌​‌‌‌​​‌‍‌​‌​‌​‌​‍‌​‌‌‌‌​​‍‌​‌‌​‌​​‍‌​‌‌​‌‌​‍‌​‌‌​​​‌‍‌​‌‌‌​​​‍‌‌​‌‌‌‌‌‍‌​‌​‌‌​​‍‌​‌​‌‌‌‌‍‌​‌‌‌‌‌​‍‌​‌‌​​‌​‍‌‌​‌‌‌‌‌‍‌​‌‌​​‌​‍‌​‌‌‌​‌​xmpp.is"))
       (li "IRC: " (strong "tsarfox on irc.libera.chat.")))
   (ul (@ (class "horizontal-list"))
       (li "GPG: " ,(hyperlink "/static/gpg.txt" "6581 A4FC 404F 6434 AEA3  008C 45ED 4DC3 05BA DA33")))
   (ul (@ (class "horizontal-list"))
       (li ,(hyperlink "https://git.sr.ht/~jakob" "git"))
       (li ,(hyperlink "https://social.jakob.space/jakob" "fedi"))
       (li ,(hyperlink "https://en.wikipedia.org/wiki/User:ZeroDaysForDays" "wiki"))
       (li ,(hyperlink "http://tilde.town/~jakob" "tilde"))
       (li ,(hyperlink "http://zerodaysfordays.sdf.org/" "sdf"))
       (li ,(hyperlink "https://lobste.rs/u/jakob" "lobste.rs")))
   (main (@ (class "overline"))
         (div (@ (class "portrait"))
              ,(image "portrait.png" "A portrait of myself, done by @scolastiko on Twitter."))
         (p "My name's Jakob, and I'm a self-taught "
            ,(hyperlink "https://www.gnu.org/philosophy/free-sw.html" "free software")
            ,(hyperlink "https://en.wikipedia.org/wiki/Hacker_culture#Definition" " hacker")
            ". I'm into functional programming, computer security, permaculture, and lifting
weights.")
         (p "That's the short version. I have a longer biography available " ,(hyperlink "/pages/about-complete.html" "here") ".")
         (p (b "N.B. ")
            "if you have sent an email to an address of mine
ending in 'sdf.lonestar.org' between January 2nd, 2020 and now, I have not
received it. SDF has discontinued mail service on that domain. As such, "
            ,(hyperlink "https://paste.sr.ht/%7Ejakob/18c048600c26d125d6d743e6d5b44db852573242" "I have a new PGP key.")))
   (h3 "Site Map")
   (nav (@ (id "site-map"))
        (section (h4 ,(hyperlink "/blogroll" "Blogroll"))
                 (p "A noncomprehensive list of the blogs I follow."))
        (section (h4 ,(hyperlink "/bookmark" "Bookmarks"))
                 (p "Collection of some things that I especially enjoyed reading."))
        ;; (section (h4 ,(hyperlink "/outbox" "Webmention Outbox"))
        ;;          (p "List of all the Webmention replies I've sent. Probably uninteresting to most."))
        )
   (h3 "Projects")
   ,(project-section
     "Software"
     project
     %software-projects)
   ,(project-section
     "Other Contributions"
     project
     %software-contributions
     #:subtitle
     "There are a few non-trivial contributions I've made to various free software
projects, which I enumerate here. I take pride in giving back code.")
   ,(project-section
     "Software (Abandoned)"
     project
     %abandoned-software-projects
     #:subtitle
     "The unfortunate reality of hobbyist programming is that projects to be
abandoned once that coding itch is satisfied. That's true of many of my
projects."
     #:folded #t)
   (h3 "Capture the Flag")
   ,(project-section
     "Team Timeline"
     ctf-team
     %ctf-teams
     #:class "team-timeline-section")
   (h3 "Events Hosted")
   (ul
    (li "UMass CTF 2020")
    (li ,(hyperlink "https://ctftime.org/event/1282" "UMass CTF 2021")))
   (h3 "Presentations")
   (table
    (tr (td "Introduction to Binary Exploitation") (td "UMass Amherst") (td "October 23rd, 2019"))
    (tr (td "Learning Assembly for Fun and Profit (and Flags)") (td "UMass Amherst") (td "March 4th, 2020"))
    (tr (td "UMass Cybersecurity Club Reverse Engineering Workshop") (td "UMass Amherst") (td "October 4th, 2021")))
   (h3 "Publications")
   (p (em "None. Yet..."))))