#!/bin/sh

# Color codes ├──────────────────────────────────────────────────────────────────
none="00"; red="31"; green="32"; yellow="33"; magenta="35"; bold="01"

# Main ├────────────────────────────────────────────────────────────────────────

main() {
  kak_commands='
        set global autoreload yes
        set global autoinfo ""
        set global autoshowcompl false
        try %{ source rc }
        try %{
            exec -save-regs / %{%s%\(\K[^)]+<ret><c-s>ld<a-t>(hHdi<c-u><esc><c-o>}
        } catch %{ exec gg }
        hook global RuntimeError .+ %{
            echo -debug -- error: %val{hook_param}
            eval -buffer *debug* write debug
            quit!
        }
        exec "%sh{cat cmd}"
        exec <c-l>
        eval -buffer *debug* write debug
        nop %sh{
          printf %s\\n "$kak_selections"      > selections
          printf %s\\n "$kak_selections_desc" > state
        }
        write out
        quit!
      '

  root=$PWD
  tmpdir="${TMPDIR:-/tmp}"
  work=$(mktemp -d $tmpdir/kak-tests.XXXXXXXX)
  trap "rm -R $work" EXIT

  number_tests=0
  number_failures=0
  for dir in $(find "${@:-.}" -type d | sort); do
    cd $root/$dir;
    mkdir -p $work/$dir
    for file in in cmd rc; do
      [ -f $file ] && cp $file $work/$dir/
    done
    cd $work/$dir;
    indent="$(echo "$dir/" | sed -e 's|[^/]*/\+|  |g')"
    name=${PWD##*/}
    if [ ! -f cmd ]; then
      echo "$indent$name"
      continue
    elif [ -x enabled ] && ! ./enabled; then
      echo "$indent$name (disabled)" | colorize $yellow $none
      continue
    fi

    number_tests=$(($number_tests + 1))
    touch in; cp in out
    session="kak-tests"
    rm -f $tmpdir/kakoune/$USER/$session
    $root/../src/kak out -n -s "$session" -ui json -e "$kak_commands" > display
    retval=$?
    failed=0
    if [ ! -e error ]; then # failure not expected
      if [ $retval -ne 0 ]; then
        echo "$indent$name" | colorize $red $none
        echo "$indent  Kakoune returned error $retval"
        failed=1
      else
        for file in out selections state display; do
          if [ -f $root/$dir/$file ] && ! cmp -s $root/$dir/$file $file; then
            if [ $failed -eq 0 ]; then
              echo "$indent$name" | colorize $red $none
              failed=1
            fi
            show_diff $root/$dir/$file $file
          fi
        done
        if [ $failed -ne 0 ] && [ -f debug ]; then
          printf "\ndebug buffer:\n" | colorize $yellow $none
          cat debug
        fi
      fi
    else # failure expected
      if [ -f stderr ]; then
        sed -i -e 's/^[0-9]*:[0-9]*: //g' stderr
        if [ -s error ] && ! cmp -s error stderr; then
          echo "$indent$name" | colorize $yellow $none
          show_diff error stderr
          failed=1
        fi
      elif [ $retval -eq 0 ]; then
        echo "$indent$name" | colorize $red $none
        echo "$indent  Expected failure, but Kakoune returned 0"
        failed=1
      fi
    fi

    if [ $failed -eq 0 ]; then
      echo "$indent$name" | colorize $green $none
    else
      number_failures=$(($number_failures + 1))
    fi
  done

  if [ $number_failures -gt 0 ]; then
    color=$red
  else
    color=$green
  fi
  printf "\nResume: %s tests, %s failures\n" $number_tests $number_failures | colorize $color $none
  exit $number_failures
}

# Utility ├─────────────────────────────────────────────────────────────────────

colorize() {
  color=${1:-$none}
  style=${2:-$none}
  printf '\033[%s;%sm%s\033[00;00m\n' $style $color "$(cat)"
}

show_diff() {
  diff -u $1 $2 | while IFS='' read -r line; do
    first_character=$(printf '%s\n' "$line" | cut -b 1)
    case $first_character in
      +) color=$green ;;
      -) color=$red ;;
      @) color=$magenta ;;
      *) color=$none ;;
    esac
    printf '%s\n' "$line" | colorize $color $none
  done
}

main "$@"