#!/bin/bash

# Drives the desktop app on a virtual X display, for the scripted cases and for an agent on the runner.
# Compose for Desktop has no accessibility tree on Linux, so text is found on screenshots by OCR (tesseract);
# coordinates are screen pixels, as in the screenshots. Screenshots, the text read from them and
# a log of every command (steps.log) go to UI_OUT; the app's data stays in UI_STATE between starts.
#
#   ui start <app dir> [<setting>=<value>...]
#                                 start Xvfb, openbox and <app dir>/bin/simplex, and wait for its window; the app gets
#                                 the settings given when UI_STATE has none yet
#   ui shot <name>                save UI_OUT/NN-<name>.png and NN-<name>.txt (OCR's input and output in UI_OUT/ocr), and print the text on screen
#   ui text                       print the text on screen, one phrase per line after its centre x,y
#   ui find <text>                print "x y left top right bottom", the text's centre and box; fail if it is not on screen
#   ui ink <text>                 print the height in pixels of the text's ink, to compare text sizes
#   ui wait <text> [secs]         wait up to secs (30) until the text is on screen
#   ui click <x> <y>              click at x,y
#   ui click-text <text> [secs]   wait up to secs (20) for the text and click its centre
#   ui scroll <x> <y> <up|down> [clicks]
#                                 turn the mouse wheel over x,y, 3 clicks unless given
#   ui avatar <text> [colour]     print how many pixels of the profile image left of a list row's name (the text) stand out
#                                 from the background, and their mean colour, saving the area as UI_OUT/NN-avatar-<text>.png;
#                                 with red, green or blue, fail unless that colour dominates
#   ui type <text>                type into the focused field
#   ui key <key>...               press keys named as in xdotool (Return, Escape, ctrl+a)
#   ui do <command> [args] -- <command> [args] ...
#                                 run the commands in order, stopping at the first that fails
#   ui stop                       stop the app, openbox and Xvfb
#
# Text is compared ignoring case, spaces and punctuation, with a capital I and a lowercase l alike; a phrase that is
# exactly the text wins over one that contains it.

set -euo pipefail
# an agent on the runner runs this, and nothing it starts needs the agent's credentials
unset CLAUDE_CODE_OAUTH_TOKEN

: "${UI_OUT:?UI_OUT must be the output directory}"
export DISPLAY=${UI_DISPLAY:-:99}
state=${UI_STATE:-${RUNNER_TEMP:-/tmp}/ui}
here=$(cd "$(dirname "$0")" && pwd)
mkdir -p "$UI_OUT" "$state/ocr"

log() {
  echo "$(date -u +%H:%M:%S) $*" | tee -a "$UI_OUT/steps.log"
}

running() {
  [ -f "$state/$1.pid" ] && kill -0 "$(cat "$state/$1.pid")" 2> /dev/null
}

stop_process() {
  local name=$1 secs=$2 pid
  if ! running "$name"; then
    rm -f "$state/$name.pid"
    return
  fi
  pid=$(cat "$state/$name.pid")
  kill "$pid" 2> /dev/null || true
  for _ in $(seq "$secs"); do
    kill -0 "$pid" 2> /dev/null || break
    sleep 1
  done
  kill -9 "$pid" 2> /dev/null || true
  rm -f "$state/$name.pid"
}

start() {
  local app_dir settings=$state/config/simplex/settings.properties
  app_dir=$(cd "$1" && pwd)
  shift
  if running app; then
    echo "error: the app is already running"
    return 1
  fi
  stop_process openbox 2
  stop_process xvfb 2

  setsid Xvfb "$DISPLAY" -screen 0 1440x900x24 -nolisten tcp < /dev/null > "$UI_OUT/xvfb.log" 2>&1 &
  echo $! > "$state/xvfb.pid"
  for _ in $(seq 20); do
    xdotool getdisplaygeometry > /dev/null 2>&1 && break
    sleep 0.5
  done
  xdotool getdisplaygeometry

  setsid openbox --sm-disable < /dev/null > "$UI_OUT/openbox.log" 2>&1 &
  echo $! > "$state/openbox.pid"

  mkdir -p "$state/data" "$state/config" "$state/tmp"
  if [ $# -gt 0 ] && [ ! -f "$settings" ]; then
    mkdir -p "$(dirname "$settings")"
    printf '%s\n' "$@" > "$settings"
  fi
  XDG_DATA_HOME="$state/data" \
    XDG_CONFIG_HOME="$state/config" \
    JAVA_TOOL_OPTIONS="-Djava.io.tmpdir=$state/tmp -Dskiko.renderApi=SOFTWARE" \
    LD_LIBRARY_PATH="$app_dir/lib/app/resources" \
    setsid "$app_dir/bin/simplex" < /dev/null >> "$UI_OUT/app.log" 2>&1 &
  echo $! > "$state/app.pid"

  if ! timeout 120 xdotool search --sync --onlyvisible --name '^SimpleX$' > "$state/window"; then
    echo "error: no app window after 120 s"
    return 1
  fi
  xdotool getwindowgeometry "$(head -n 1 "$state/window")"
}

# ocr <png> lines | ocr <png> find <text>
# Dark text is cut out by a local threshold, light text (labels on coloured buttons) by the difference from a morphological open:
# a local threshold of the negative rings the buttons, and tesseract reads nothing inside a ring.
ocr() {
  local png=$1 o=$state/ocr
  shift
  convert "$png" -colorspace Gray -depth 8 "$o/gray.pgm"
  convert "$o/gray.pgm" -resize 200% -lat 60x60-5% "$o/dark.png"
  convert "$o/gray.pgm" \( +clone -morphology Erode Rectangle:9x1 -morphology Erode Rectangle:1x9 -morphology Dilate Rectangle:9x1 -morphology Dilate Rectangle:1x9 \) -compose Difference -composite -negate -resize 200% "$o/light.png"
  tesseract "$o/dark.png" "$o/dark" --psm 11 tsv > /dev/null 2>&1
  tesseract "$o/light.png" "$o/light" --psm 11 tsv > /dev/null 2>&1
  python3 "$here/screen-text.py" 2 "$o" "$@"
}

screen_ocr() {
  import -window root "$state/ocr/screen.png"
  ocr "$state/ocr/screen.png" "$@"
}

# prints "x y left top right bottom" of the text once it is on screen
wait_for() {
  local text=$1 deadline=$((SECONDS + $2))
  until screen_ocr find "$text"; do
    [ "$SECONDS" -lt "$deadline" ] || return 1
    sleep 1
  done
}

# prints UI_OUT/NN-<name>, numbered after the files already saved
next_file() {
  local n
  n=$(find "$UI_OUT" -maxdepth 1 -name '[0-9][0-9]-*.png' | wc -l)
  printf '%s/%02d-%s' "$UI_OUT" $((n + 1)) "$1"
}

shot() {
  local f
  f=$(next_file "$1")
  import -window root "$f.png"
  ocr "$f.png" lines > "$f.txt"
  mkdir -p "$UI_OUT/ocr"
  for pass in dark light; do
    cp "$state/ocr/$pass.png" "$UI_OUT/ocr/$(basename "$f")-$pass.png"
    cp "$state/ocr/$pass.tsv" "$UI_OUT/ocr/$(basename "$f")-$pass.tsv"
  done
  echo "::group::text on screen: $(basename "$f")"
  cat "$f.txt"
  echo "::endgroup::"
  log "shot $(basename "$f").png"
}

click() {
  xdotool mousemove --sync "$1" "$2" click 1
  sleep 1
}

# X buttons 4 and 5 are the wheel turned up and down
scroll() {
  local button
  case "$3" in
    up) button=4 ;;
    down) button=5 ;;
    *)
      echo "error: scroll up or down, not \"$3\""
      return 1
      ;;
  esac
  xdotool mousemove --sync "$1" "$2" click --repeat "$4" --delay 100 "$button"
  sleep 1
}

# A list row's profile image is 42 px square, 8 px left of the row's name, and starts a little below the name's top:
# the area allows for OCR's box being a few pixels off, and leaves out the rows above and below.
avatar() {
  local text=$1 colour=${2:-} pos x y l t r b f stats
  if ! pos=$(screen_ocr find "$text"); then
    log "avatar \"$text\": not on screen"
    return 1
  fi
  read -r x y l t r b <<< "$pos"
  f=$(next_file "avatar-$(tr -cd 'a-zA-Z0-9_' <<< "$text")")
  convert "$state/ocr/screen.png" -crop "52x64+$((l > 56 ? l - 56 : 0))+$((t > 6 ? t - 6 : 0))" +repage "$f.png"
  convert "$f.png" -depth 8 "$state/ocr/avatar.ppm"
  if ! stats=$(python3 "$here/screen-colour.py" "$state/ocr/avatar.ppm" ${colour:+"$colour"}); then
    log "avatar \"$text\": $stats, not $colour"
    return 1
  fi
  log "avatar \"$text\": $stats${colour:+, $colour}"
}

case "${1:-}" in
  start)
    shift
    log "start $*"
    start "$@"
    ;;
  shot) shot "$2" ;;
  text) screen_ocr lines ;;
  find)
    if ! pos=$(screen_ocr find "$2"); then
      log "find \"$2\": not on screen" >&2
      exit 1
    fi
    log "find \"$2\": $pos" > /dev/null
    echo "$pos"
    ;;
  ink)
    if ! pos=$(screen_ocr find "$2"); then
      log "ink \"$2\": not on screen" >&2
      exit 1
    fi
    read -r _ _ l t r b <<< "$pos"
    # 2 px around OCR's box, less than the gap between lines
    h=$(python3 "$here/screen-ink.py" "$state/ocr/gray.pgm" "$l" $((t - 2)) "$r" $((b + 2)))
    log "ink \"$2\": $h px" > /dev/null
    echo "$h"
    ;;
  wait)
    secs=${3:-30}
    if ! pos=$(wait_for "$2" "$secs"); then
      log "wait \"$2\": not on screen after $secs s"
      exit 1
    fi
    read -r x y _ <<< "$pos"
    log "wait \"$2\": at $x,$y"
    ;;
  click)
    click "$2" "$3"
    log "click $2,$3"
    ;;
  click-text)
    secs=${3:-20}
    if ! pos=$(wait_for "$2" "$secs"); then
      log "click-text \"$2\": not on screen after $secs s"
      exit 1
    fi
    read -r x y _ <<< "$pos"
    click "$x" "$y"
    log "click-text \"$2\" at $x,$y"
    ;;
  scroll)
    scroll "$2" "$3" "$4" "${5:-3}"
    log "scroll $4 at $2,$3, ${5:-3} clicks"
    ;;
  avatar) avatar "$2" "${3:-}" ;;
  type)
    xdotool type --delay 50 -- "$2"
    log "type \"$2\""
    ;;
  key)
    shift
    xdotool key --delay 100 -- "$@"
    log "key $*"
    ;;
  do)
    shift
    command=()
    for arg in "$@" --; do
      if [ "$arg" != -- ]; then
        command+=("$arg")
      elif [ ${#command[@]} -gt 0 ]; then
        "$0" "${command[@]}"
        command=()
      fi
    done
    ;;
  stop)
    stop_process app 10
    stop_process openbox 2
    stop_process xvfb 2
    log "stop"
    ;;
  *)
    sed -n '3,/^$/s/^# \{0,1\}//p' "$0"
    exit 1
    ;;
esac