#!/usr/bin/env bash
TARGET_BRANCH=${2:-$(git rev-parse --abbrev-ref HEAD)}

if [ -n "$1" ]; then
  BASE_BRANCH="$1"
else
  if [ "$TARGET_BRANCH" != "dev" ] && git show-ref --verify --quiet refs/heads/dev; then
    BASE_BRANCH="dev"
  elif git show-ref --verify --quiet refs/heads/main; then
    BASE_BRANCH="main"
  elif git show-ref --verify --quiet refs/heads/master; then
    BASE_BRANCH="master"
  else
    echo "Warning: Neither 'dev', 'main' nor 'master' found. Defaulting to 'main'." >&2
    BASE_BRANCH="main"
  fi
fi

if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
  echo "Error: Not a git repository." >&2
  exit 1
fi

if ! git show-ref --verify --quiet refs/heads/"$BASE_BRANCH"; then
  echo "Error: Base branch '$BASE_BRANCH' does not exist." >&2
fi

REMOTE_URL=$(git config --get remote.origin.url)
REPO_URL=""

if [[ "$REMOTE_URL" == git@* ]]; then
  REPO_URL=$(echo "$REMOTE_URL" | sed -E 's/git@([^:]+):/https:\/\/\1\//')
fi
REPO_URL=${REPO_URL%.git}

get_commit_link() {
  local hash=$1
  if [ -n "$REPO_URL" ]; then
    echo "($REPO_URL/commit/$hash)"
  else
    echo "($hash)"
  fi
}
feats=""
fixes=""
refactors=""
perfs=""
styles=""
tests=""
builds=""
ops=""
docs=""
chores=""
merges=""
others=""

while IFS="|" read -r hash subject; do
  link=$(get_commit_link "$hash")

  if [[ "$subject" =~ ^([a-z]+)(\([a-z0-9\ -]+\))?!?:[[:space:]]*(.*)$ ]]; then
    type="${BASH_REMATCH[1]}"
    clean_msg="${BASH_REMATCH[3]}"

    line="  - [\`${hash:0:7}\`]${link}: ${clean_msg}"

    case "$type" in
    feat) feats="${feats}\n${line}" ;;
    fix) fixes="${fixes}\n${line}" ;;
    refactor) refactors="${refactors}\n${line}" ;;
    perf) perfs="${perfs}\n${line}" ;;
    style) styles="${styles}\n${line}" ;;
    test) tests="${tests}\n${line}" ;;
    build) builds="${builds}\n${line}" ;;
    ops) ops="${ops}\n${line}" ;;
    docs) docs="${docs}\n${line}" ;;
    chore) chores="${chores}\n${line}" ;;
    merge) merges="${merges}\n${line}" ;;
    *) others="${others}\n${line} (Type: $type)" ;;
    esac
  else
    line="  - [\`${hash:0:7}\`]${link}: ${subject}"
    others="${others}\n${line}"
  fi

done < <(git log --no-merges --pretty=tformat:"%H|%s" "$BASE_BRANCH..$TARGET_BRANCH")

if [ -n "$feats" ]; then
  echo -e "\n- **New Features:**$feats"
fi
if [ -n "$fixes" ]; then
  echo -e "\n- **Bug Fixes:**$fixes"
fi
if [ -n "$refactors" ]; then
  echo -e "\n- **Code Refactoring:**$refactors"
fi
if [ -n "$perfs" ]; then
  echo -e "\n- **Performance Improvements:**$perfs"
fi
if [ -n "$styles" ]; then
  echo -e "\n- **Code Style:**$styles"
fi
if [ -n "$tests" ]; then
  echo -e "\n- **Tests:**$tests"
fi
if [ -n "$builds" ]; then
  echo -e "\n- **Build System/Dependencies:**$builds"
fi
if [ -n "$ops" ]; then
  echo -e "\n- **Operations/Infrastructure:**$ops"
fi
if [ -n "$docs" ]; then
  echo -e "\n- **Documentation:**$docs"
fi
if [ -n "$chores" ]; then
  echo -e "\n- **Chores/Maintenance:**$chores"
fi
if [ -n "$merges" ]; then
  echo -e "\n- **Merges:**$merges"
fi
if [ -n "$others" ]; then
  echo -e "\n- **Other Commits:**$others"
fi
echo -e "\n> Automatically generated by [git-changes](https://github.com/demenik/dots/tree/main/home/shells/zsh/scripts/git-changes.sh)"