#!/usr/bin/env bash
set -euo pipefail

REPO_DIR="${REPO_DIR:-$(pwd)}"
SUPERPOWERS_BRANCH="${SUPERPOWERS_BRANCH:-thirdparty/skill}"
SUPERPOWERS_DIR="${SUPERPOWERS_DIR:-superpowers}"
SUPERPOWERS_LIST="${SUPERPOWERS_LIST:-codex/skills/.sources/superpowers.list}"
TARGET_BRANCH="${TARGET_BRANCH:-main}"
COMMIT_AUTHOR_NAME="${COMMIT_AUTHOR_NAME:-playbook-bot}"
COMMIT_AUTHOR_EMAIL="${COMMIT_AUTHOR_EMAIL:-playbook-bot@local}"

cd "$REPO_DIR"

git config user.name "$COMMIT_AUTHOR_NAME"
git config user.email "$COMMIT_AUTHOR_EMAIL"

git fetch origin "$SUPERPOWERS_BRANCH"
git fetch origin "$TARGET_BRANCH"

tmp_dir="$(mktemp -d)"
cleanup() {
  rm -rf "$tmp_dir"
}
trap cleanup EXIT

git archive --format=tar "origin/${SUPERPOWERS_BRANCH}" "${SUPERPOWERS_DIR}/skills" | tar -xf - -C "$tmp_dir"

tmp_skills_dir="$tmp_dir/${SUPERPOWERS_DIR}/skills"
if [ ! -d "$tmp_skills_dir" ]; then
  echo "ERROR: ${SUPERPOWERS_DIR}/skills not found in ${SUPERPOWERS_BRANCH}" >&2
  exit 1
fi

git checkout -B "$TARGET_BRANCH" "origin/$TARGET_BRANCH"

mkdir -p "$(dirname "$SUPERPOWERS_LIST")"

old_list="$SUPERPOWERS_LIST"
if [ -f "$old_list" ]; then
  while IFS= read -r name; do
    [ -n "$name" ] || continue
    rm -rf "codex/skills/$name"
  done < "$old_list"
fi

names=()
for dir in "$tmp_skills_dir"/*; do
  [ -d "$dir" ] || continue
  name="$(basename "$dir")"

  if [ -d "codex/skills/$name" ] && ! grep -qx "$name" "$old_list" 2>/dev/null; then
    echo "ERROR: skill name conflict: $name" >&2
    exit 1
  fi

  rm -rf "codex/skills/$name"
  cp -R "$dir" "codex/skills/$name"
  names+=("$name")
done

printf "%s\n" "${names[@]}" | sort > "$SUPERPOWERS_LIST"

update_block() {
  local file="$1"
  local start="<!-- superpowers:skills:start -->"
  local end="<!-- superpowers:skills:end -->"
  local tmp

  tmp="$(mktemp)"
  {
    echo "### Third-party Skills (superpowers)"
    echo ""
    echo "$start"
    while IFS= read -r name; do
      [ -n "$name" ] || continue
      echo "- $name"
    done < "$SUPERPOWERS_LIST"
    echo "$end"
  } > "$tmp"

  if grep -q "$start" "$file"; then
    awk -v start="$start" -v end="$end" -v block="$tmp" '
      BEGIN {
        while ((getline line < block) > 0) { buf[++n] = line }
        close(block)
        inblock=0
        replaced=0
      }
      {
        if (!replaced && $0 == start) {
          for (i=1; i<=n; i++) print buf[i]
          inblock=1
          replaced=1
          next
        }
        if (inblock) {
          if ($0 == end) { inblock=0 }
          next
        }
        print
      }
    ' "$file" > "${file}.tmp"
    mv "${file}.tmp" "$file"
  else
    echo "" >> "$file"
    cat "$tmp" >> "$file"
  fi

  rm -f "$tmp"
}

update_block "SKILLS.md"

git add codex/skills SKILLS.md "$SUPERPOWERS_LIST"

if git diff --cached --quiet; then
  echo "No changes to sync."
  exit 0
fi

git commit -m ":package: deps(skills): sync superpowers"

TOKEN="${WORKFLOW:-}"
if [ -n "$TOKEN" ] && [ -n "${GITHUB_SERVER_URL:-}" ] && [ -n "${GITHUB_REPOSITORY:-}" ]; then
  git remote set-url origin "https://oauth2:${TOKEN}@${GITHUB_SERVER_URL#https://}/${GITHUB_REPOSITORY}.git"
fi

git push origin "$TARGET_BRANCH"