#!/usr/bin/env bash
#
# Usage:
#
#  build_all_examples [-b|--branch=<branch>]
#                     [-c|--continue]
#                     [-d|--debug]
#                     [-i|--ini]
#                     [-l|--limit=#]
#                     [-n|--nobuild]
#                     [-r|--resume=<path>]
#                     [-s|--skip]
#
# build_all_examples [...] branch [resume-from]
#

. mfutil

GITREPO=https://github.com/MarlinFirmware/Configurations.git
STAT_FILE=./.pio/.buildall

usage() { echo "
Usage: $SELF [-b|--branch=<branch>] [-d|--debug] [-i|--ini] [-r|--resume=<path>]
       $SELF [-b|--branch=<branch>] [-d|--debug] [-i|--ini] [-c|--continue]
       $SELF [-b|--branch=<branch>] [-d|--debug] [-i|--ini] [-s|--skip]
       $SELF [-b|--branch=<branch>] [-d|--debug] [-n|--nobuild]
       $SELF [...] branch [resume-point]
"
}

# Assume the most recent configs
BRANCH=import-2.0.x
unset FIRST_CONF
EXIT_USAGE=
LIMIT=1000

while getopts 'b:cdhil:nqr:sv-:' OFLAG; do
  case "${OFLAG}" in
    b) BRANCH=$OPTARG       ; bugout "Branch: $BRANCH" ;;
    r) FIRST_CONF="$OPTARG" ; bugout "Resume: $FIRST_CONF" ;;
    c) CONTINUE=1           ; bugout "Continue" ;;
    s) CONTSKIP=1           ; bugout "Continue, skipping" ;;
    i) CREATE_INI=1         ; bugout "Generate an INI file" ;;
    h) EXIT_USAGE=1 ; break ;;
    l) LIMIT=$OPTARG        ; bugout "Limit to $LIMIT build(s)" ;;
  d|v) DEBUG=1              ; bugout "Debug ON" ;;
    n) DRYRUN=1             ; bugout "Dry Run" ;;
    -) IFS="=" read -r ONAM OVAL <<< "$OPTARG"
       case "$ONAM" in
       branch) BRANCH=$OVAL       ; bugout "Branch: $BRANCH" ;;
       resume) FIRST_CONF="$OVAL" ; bugout "Resume: $FIRST_CONF" ;;
     continue) CONTINUE=1   ; bugout "Continue" ;;
         skip) CONTSKIP=2   ; bugout "Continue, skipping" ;;
        limit) LIMIT=$OVAL  ; bugout "Limit to $LIMIT build(s)" ;;
          ini) CREATE_INI=1 ; bugout "Generate an INI file" ;;
         help) [[ -z "$OVAL" ]] || perror "option can't take value $OVAL" $ONAM ; EXIT_USAGE=1 ;;
        debug) DEBUG=1      ; bugout "Debug ON" ;;
      nobuild) DRYRUN=1     ; bugout "Dry Run" ;;
            *) EXIT_USAGE=2 ; echo "$SELF: unrecognized option \`--$ONAM'" ; break ;;
       esac
       ;;
    *) EXIT_USAGE=2 ; break ;;
  esac
done

# Extra arguments count as BRANCH, FIRST_CONF
shift $((OPTIND - 1))
[[ $# > 0 ]] && { BRANCH=$1 ; shift 1 ; bugout "BRANCH=$BRANCH" ; }
[[ $# > 0 ]] && { FIRST_CONF=$1 ; shift 1 ; bugout "FIRST_CONF=$FIRST_CONF" ; }
[[ $# > 0 ]] && { EXIT_USAGE=2 ; echo "too many arguments" ; }

((EXIT_USAGE)) && { usage ; let EXIT_USAGE-- ; exit $EXIT_USAGE ; }

echo "This script downloads each Configuration and attempts to build it."
echo "On failure the last-built configs will be left in your working copy."
echo "Restore your configs with 'git checkout -f' or 'git reset --hard HEAD'."

if [[ -f "$STAT_FILE" ]]; then
  IFS='*' read BRANCH FIRST_CONF <"$STAT_FILE"
fi

# If -c is given start from the last attempted build
if ((CONTINUE)); then
  if [[ -z $BRANCH || -z $FIRST_CONF ]]; then
    echo "Nothing to continue"
    exit
  fi
elif ((CONTSKIP)); then
  if [[ -n $BRANCH && -n $FIRST_CONF ]]; then
    SKIP_CONF=1
  else
    echo "Nothing to skip"
    exit
  fi
fi

# Check if the current repository has unmerged changes
if [[ $SKIP_CONF ]]; then
  echo "Skipping $FIRST_CONF"
elif [[ $FIRST_CONF ]]; then
  echo "Resuming from $FIRST_CONF"
else
  git diff --quiet || { echo "The working copy is modified. Commit or stash changes before proceeding."; exit ; }
fi

# Create a temporary folder inside .pio
TMP=./.pio/build-$BRANCH
[[ -d "$TMP" ]] || mkdir -p $TMP

# Download Configurations into the temporary folder
if [[ ! -e "$TMP/README.md" ]]; then
  echo "Fetching Configurations from GitHub to $TMP"
  git clone --depth=1 --single-branch --branch "$BRANCH" $GITREPO "$TMP" || { echo "Failed to clone the configuration repository"; exit ; }
else
  echo "Using cached Configurations at $TMP"
fi

echo -e "Start build...\n====================="
shopt -s nullglob
IFS='
'
CONF_TREE=$( ls -d "$TMP"/config/examples/*/ "$TMP"/config/examples/*/*/ "$TMP"/config/examples/*/*/*/ "$TMP"/config/examples/*/*/*/*/ | grep -vE ".+\.(\w+)$" )
for CONF in $CONF_TREE ; do

  # Get a config's directory name
  DIR=$( echo $CONF | sed "s|$TMP/config/examples/||" )

  # If looking for a config, skip others
  [[ $FIRST_CONF ]] && [[ $FIRST_CONF != $DIR && "$FIRST_CONF/" != $DIR ]] && continue
  # Once found, stop looking
  unset FIRST_CONF

  # If skipping, don't build the found one
  [[ $SKIP_CONF ]] && { unset SKIP_CONF ; continue ; }

  # ...if skipping, don't build this one
  compgen -G "${CONF}Con*.h" > /dev/null || continue

  # Remember where we are in case of failure
  echo "${BRANCH}*${DIR}" >"$STAT_FILE"

  # Build or pretend to build
  if [[ $DRYRUN ]]; then
    echo "[DRYRUN] build_example internal \"$TMP\" \"$DIR\""
  else
    # Build folder is unknown so delete all "config.ini" files
    [[ $CREATE_INI ]] && find ./.pio/build/ -name "config.ini" -exec rm "{}" \;
    ((DEBUG)) && echo "\"$HERE/build_example\" \"internal\" \"$TMP\" \"$DIR\""
    "$HERE/build_example" "internal" "$TMP" "$DIR" || { echo "Failed to build $DIR"; exit ; }
    # Build folder is unknown so copy any "config.ini"
    [[ $CREATE_INI ]] && find ./.pio/build/ -name "config.ini" -exec cp "{}" "$CONF" \;
  fi

  ((--LIMIT)) || { echo "Limit reached" ; PAUSE=1 ; break ; }

done

# Delete the build state if not paused early
[[ $PAUSE ]] || rm "$STAT_FILE"

# Delete the temp folder if not preserving generated INI files
if [[ -e "$TMP/config/examples" ]]; then
  if [[ $CREATE_INI ]]; then
    OPEN=$( which gnome-open xdg-open open | head -n1 )
    $OPEN "$TMP"
  elif [[ ! $PAUSE ]]; then
    rm -rf "$TMP"
  fi
fi