#!/bin/dash

# Test if we have a valid repo before doing anything.
if ! [ -d ".tigger/" ]; then
  printf "tigger-add: error: tigger repository directory .tigger not found\n" >&2
  exit 1
fi

# Get current branch + commit as usual.
branch=$(cat .tigger/branch.tig)
mkdir --parents ".tigger/$branch/"
commit=$(find .tigger/"$branch"/ -maxdepth 1 -type d | grep -o -E "[\/][^\/]*$" | tr -d "/" | sort -n -r | head -n 1)
if [ "$commit" = "" ]; then
  commit="0"
  mkdir --parents ".tigger/$branch/$commit/"
fi

# Grabs regular files from our working dir, staging and commit.
files=$(find .tigger/"$branch"/"$commit"/commit/ .tigger/"$branch"/"$commit"/staged/ ./ -maxdepth 1 -type f -printf "%P\n" | sort | uniq | grep -v -E "^\." 2>/dev/null)
for filename in $files; do
  
  c_dir=".tigger/$branch/$commit/commit/$filename";
  s_dir=".tigger/$branch/$commit/staged/$filename";

  is_c=0
  is_s=0
  is_w=0
  if [ -e "$c_dir" ]; then
    is_c=1
  fi
  if [ -e "$s_dir" ]; then
    is_s=1
  fi
  if [ -e "$filename" ]; then
    is_w=1
  fi

  # There are a LOT of very specific cases here.

  if [ $is_w -eq 0 ] && [ $is_s -eq 0 ] && [ $is_c -eq 1 ]; then
    printf "%s - deleted\n" "$filename"
    continue
  fi

  if [ $is_w -eq 1 ] && [ $is_s -eq 0 ] && [ $is_c -eq 0 ]; then
    printf "%s - untracked\n" "$filename"
    continue;
  fi

  if [ $is_w -eq 1 ] && [ $is_s -eq 1 ] && [ $is_c -eq 1 ]; then
    c="$(cat "$c_dir")"
    s="$(cat "$s_dir")"
    w="$(cat "$filename")"

    if [ "$w" != "$s" ] && [ "$s" != "$c" ] && [ "$c" != "$w" ]; then
      printf "%s - file changed, different changes staged for commit\n" "$filename"
      continue
    fi

    if [ "$w" = "$s" ] && [ "$s" != "$c" ]; then
      printf "%s - file changed, changes staged for commit\n" "$filename"
      continue
    fi

    if [ "$w" != "$s" ] && [ "$s" = "$c" ]; then
      printf "%s - file changed, changes not staged for commit\n" "$filename"
      continue
    fi

    if [ "$w" = "$s" ] && [ "$s" = "$c" ]; then
      printf "%s - same as repo\n" "$filename"
      continue
    fi
  fi

  if [ $is_w -eq 0 ] && [ $is_s -eq 1 ] && [ $is_c -eq 1 ] && [ "$(diff "$s_dir" "$c_dir")" = "" ]; then
    printf "%s - file deleted\n" "$filename"
    continue
  fi

  if [ $is_w -eq 1 ] && [ $is_s -eq 1 ] && [ $is_c -eq 0 ] && [ "$(diff "$filename" "$s_dir")" = "" ]; then
    printf "%s - added to index\n" "$filename"
    continue
  fi

  if [ $is_w -eq 1 ] && [ $is_s -eq 1 ] && [ $is_c -eq 0 ] && [ "$(diff "$filename" "$s_dir")" != "" ]; then
    printf "%s - added to index, file changed\n" "$filename"
    continue;
  fi

  if [ $is_w -eq 0 ] && [ $is_s -eq 1 ] && [ $is_c -eq 0 ]; then
    printf "%s - added to index, file deleted\n" "$filename"
    continue;
  fi

  printf "%s - untracked\n" "$filename"

done

exit 0