#!/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, then current commit (default 0).
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


commit_files=".tigger/$branch/$commit/"
file_dir="$commit_files/commit/"
mkdir --parents "$file_dir"
mkdir --parents "$commit_files/staged/"


# -a causes all files already in the index to have their contents from the 
# current directory added to the index before the commit. We have to remove
# the message arg before testing the regex here.
message=$(echo "$@" | grep -o -E "\-m\s?.*" | cut -d' ' -f2- | tr -d \"\')
if [ "$(echo "$@" | sed "s|$message||g" | grep -o -E "\-a")" != "" ]; then
  for filename in "$commit_files"/staged/*; do
    basename=$(basename "$filename")
    if ! [ -e "$basename" ]; then
      continue
    fi
    cp "$basename" "$commit_files"/staged/
  done
fi


# If all files in staging are equal to those in commit, we have nothing to commit.
different=""
for filename in "$commit_files"/staged/*; do
  basename=$(basename "$filename")

  EXISTS="$(cmp --silent .tigger/"$branch"/"$commit"/commit/"$basename" "$filename"; echo $?)"
  if [ "$EXISTS" -ne 0 ]; then
    different="true"
    break
  fi
done
for filename in "$commit_files"/commit/*; do
  basename=$(basename "$filename")

  EXISTS="$(cmp --silent .tigger/"$branch"/"$commit"/staged/"$basename" "$filename"; echo $?)"
  if [ "$EXISTS" -ne 0 ]; then
    different="true"
    break
  fi
done
if [ "$different" = "" ] || [ -z "$(find .tigger/"$branch"/"$commit"/staged/ .tigger/"$branch"/"$commit"/commit/ -maxdepth 1 -type f)" ] ; then
  printf "nothing to commit\n"
  exit 0
fi


# Copy all from staged into commit.
#for filename in "$commit_files"/staged/*; do
#  cp "$filename" "$file_dir"
#done
rm -r --force "$commit_files"/commit/
cp -r "$commit_files"/staged "$commit_files"/commit/


# Copy our commit message and setup our new commit (n + 1).
#printf "%s > .tigger/%s/%s/message.tig\n" "$branch" "$commit"
printf "%s" "$message" > .tigger/"$branch"/"$commit"/message.tig
new_commit="$((($(cat .tigger/commit_count.tig) + 1)))"
mkdir --parents ".tigger/$branch/$new_commit/commit"
cp -r ".tigger/$branch/$commit/commit" ".tigger/$branch/$new_commit/"
cp -r ".tigger/$branch/$commit/commit" ".tigger/$branch/$new_commit/staged"
touch .tigger/branch.unlock

# Increment our commit count value (which isn't used outside of printing).
echo "$new_commit" > .tigger/commit_count.tig

printf "Committed as commit %s\n" "$((($(printf "%s" "$new_commit") - 1)))"
exit 0