#!/bin/sh

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

main() { number_tests=0 number_failures=0
  dirs=$@
  test=$(pwd)
  work=$(mktemp --directory)
  cp --recursive . $work
  trap "rm --recursive $work" EXIT
  for dir in $(find $dirs -type d); do
    cd $test/$dir; test_files=$(find * -name out -o -name selections -o -name state)
    cd $work/$dir; { IFS=¬
      indent=$(repeat ' ' $(pwd | sed "s|$test||" | tr --delete --complement / | awk '{ print length }'))
      name=$(basename $PWD)
      ! exists cmd && {
        echo $indent$name
      } || { nop=$((number_tests++))
        touch in; cp in out
        kak_commands="set global autoreload yes
                      try %{
                        source rc
                      }
                      try %{
                        exec '%s%[(](.+?)[)]<ret>i<del><del><esc>a<backspace><c-u><esc>'
                      } \
                      catch %{
                        exec gg
                      }
                      exec '$(<cmd)'
                      eval -buffer *debug* write debug
                      nop %sh{ IFS==
                        echo \"\$kak_selections\"      > selections
                        echo \"\$kak_selections_desc\" > state
                      }
                      write out
                      quit!
        "
        kak out -n -e $kak_commands
        for expect in $test_files; do
          cmp --quiet $test/$dir/$expect $expect && {
            echo "$indent$name" | colorize green normal
          } || { nop=$((number_failures++))
            echo "$indent$name" | colorize red normal
            echo
            IFS=$'\n'
            for line in $(diff --unified $test/$dir/$expect $expect); do IFS=¬
              first_character=$(head --bytes 1 <<< $line)
              color=$(match $first_character + green - red @ magenta none)
              colorize $color normal <<< $line
            done
            echo
            colorize yellow normal <<< "debug buffer:"
            cat debug
            echo
          }
        done
      }
    }
  done
  (( $number_failures > 0 )) && color=red ||
                                color=green
  echo
  echo Resume:
  echo $number_tests tests, $number_failures failures | colorize $color normal
}

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

match() {
  expression=$1; shift
  while [[ $@ ]]; do
    pattern=$1; shift; value=$1 next=$1 default_value=$pattern
    [[ $next ]] || {
      echo $default_value
      return 1
    }
    [[ $expression = $pattern ]] && {
      echo $value
      return 0
    }
    shift
  done
}

repeat() { text=$1 count=${2:-0}
  echo $(yes $text | head --lines $count | join)
}

join() {
  tr --delete "\n"
}

exists() {
  test -e $@
}

get_ansi_code() { color_name=${1:-none} style_name=${2:-none}
  color='none    00
         red     31
         green   32
         yellow  33
         magenta 35'
  style='none    00
         bold    01'
  color_nr=$(awk "/$color_name/ { print \$2 }" <<< $color)
  style_nr=$(awk "/$style_name/ { print \$2 }" <<< $style)
  sed s/COLOR_NR/$color_nr/';'s/STYLE_NR/$style_nr/ <<< '\e[STYLE_NR;COLOR_NRm'
}

colorize() { text=$(cat) color_name=${1:-none} style_name=${2:-none}
  echo -e $(get_ansi_code $color_name $style_name)$text$(get_ansi_code none none)
}


main $@