# CalVer Version Generator
# Generates YYYY.MM.BUILD version from git tags
# BUILD = count of tags matching current month + 1

name: CalVer Version
description: Generate a CalVer (YYYY.MM.BUILD) version from git tags

outputs:
  version:
    description: CalVer version (e.g., 2026.2.5)
    value: ${{ steps.calver.outputs.version }}
  sha_short:
    description: Short commit SHA (7 chars)
    value: ${{ steps.calver.outputs.sha_short }}
  version_sha:
    description: Version with SHA suffix (e.g., 2026.2.5-abc1234)
    value: ${{ steps.calver.outputs.version_sha }}
  branch:
    description: Current branch name
    value: ${{ steps.calver.outputs.branch }}
  timestamp:
    description: UTC timestamp in ISO 8601 format
    value: ${{ steps.calver.outputs.timestamp }}

runs:
  using: composite
  steps:
    - name: Generate CalVer version
      id: calver
      shell: bash
      run: |
        YEAR=$(date -u +%Y)
        MONTH=$(date -u +%-m)
        PREFIX="${YEAR}.${MONTH}."

        # Count existing tags for this month
        git fetch --tags
        BUILD=$(git tag -l "${PREFIX}*" | wc -l)
        BUILD=$((BUILD + 1))

        VERSION="${PREFIX}${BUILD}"
        SHA_SHORT=$(echo "$GITHUB_SHA" | cut -c1-7)

        echo "version=${VERSION}" >> $GITHUB_OUTPUT
        echo "sha_short=${SHA_SHORT}" >> $GITHUB_OUTPUT
        echo "version_sha=${VERSION}-${SHA_SHORT}" >> $GITHUB_OUTPUT
        echo "branch=${GITHUB_REF_NAME}" >> $GITHUB_OUTPUT
        echo "timestamp=$(date -u +'%Y-%m-%dT%H:%M:%SZ')" >> $GITHUB_OUTPUT

        echo "CalVer version: ${VERSION}"