#!/usr/bin/env bash
# Create a CalVer release tag and push to trigger CI.
#
# Usage:
#   .scripts/release.sh           # auto-generates next version (YYYY.M.BUILD)
#   .scripts/release.sh 2026.3.11 # explicit version
#   .scripts/release.sh -y        # auto-generate + skip confirmation

set -euo pipefail

SKIP_CONFIRM=false
VERSION=""

for arg in "$@"; do
  case "$arg" in
    -y) SKIP_CONFIRM=true ;;
    *) VERSION="$arg" ;;
  esac
done

# --- Ensure we're on main and up to date ---

BRANCH=$(git rev-parse --abbrev-ref HEAD)
if [[ "$BRANCH" != "main" ]]; then
  echo "ERROR: Must be on main branch (currently on ${BRANCH})"
  exit 1
fi

echo "==> Fetching latest..."
git fetch origin main --tags --quiet
LOCAL=$(git rev-parse HEAD)
REMOTE=$(git rev-parse origin/main)
if [[ "$LOCAL" != "$REMOTE" ]]; then
  echo "ERROR: Local main is not up to date with origin. Run: git pull"
  exit 1
fi

# --- Determine version ---

YEAR=$(date +%Y)
MONTH=$(date +%-m) # no leading zero

if [[ -z "$VERSION" ]]; then
  # Find the highest build number for this year.month
  LAST_BUILD=$(git tag --list "${YEAR}.${MONTH}.*" --sort=-v:refname | head -1 | awk -F. '{print $3}')
  NEXT_BUILD=$((${LAST_BUILD:-0} + 1))
  VERSION="${YEAR}.${MONTH}.${NEXT_BUILD}"
fi

# Validate format
if [[ ! "$VERSION" =~ ^20[0-9]{2}\.[0-9]+\.[0-9]+$ ]]; then
  echo "ERROR: Invalid version format '${VERSION}'. Expected YYYY.M.BUILD (e.g., 2026.3.11)"
  exit 1
fi

# Check tag doesn't already exist
if git rev-parse "refs/tags/${VERSION}" &>/dev/null; then
  echo "ERROR: Tag ${VERSION} already exists"
  exit 1
fi

# --- Show what's being released ---

LAST_TAG=$(git tag --sort=-v:refname | head -1)
echo ""
echo "Version:  ${VERSION}"
echo "Previous: ${LAST_TAG:-none}"
echo "Commit:   $(git log -1 --format='%h %s')"
echo ""

if [[ -n "$LAST_TAG" ]]; then
  COMMIT_COUNT=$(git rev-list "${LAST_TAG}..HEAD" --count)
  echo "Changes since ${LAST_TAG} (${COMMIT_COUNT} commits):"
  git log "${LAST_TAG}..HEAD" --oneline --no-merges
  echo ""
fi

# --- Confirm ---

if [[ "$SKIP_CONFIRM" != true ]]; then
  read -rp "Create tag ${VERSION} and trigger release? [y/N] " answer
  [[ "$answer" =~ ^[Yy]$ ]] || {
    echo "Aborted."
    exit 0
  }
  echo ""
fi

# --- Tag and push ---

git tag "$VERSION"
git push origin tag "$VERSION"

echo ""
echo "==> Tag ${VERSION} pushed. CI will build:"
echo "    - manticorum67/major-domo-discordapp:${VERSION}"
echo "    - manticorum67/major-domo-discordapp:production"
echo ""
echo "Deploy with: .scripts/deploy.sh"