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

# Compute next CalVer version: YYYY.MM.BUILD
# Reads latest Anvil release tag, increments build number
# Resets build to 1 on new month
# Defaults to YYYY.MM.1 if no prior release exists

ANVIL="${ANVIL_CLI:-anvil}"
YEAR_MONTH=$(date +"%Y.%m")

# Get latest release tag (may fail if no releases exist)
LATEST=$($ANVIL release list --format json 2>/dev/null | jq -r '.[0].tag // empty' || true)

if [ -z "$LATEST" ]; then
    echo "${YEAR_MONTH}.1"
    exit 0
fi

# Parse existing tag
LATEST_YM=$(echo "$LATEST" | cut -d. -f1-2)
LATEST_BUILD=$(echo "$LATEST" | cut -d. -f3)

if [ "$LATEST_YM" = "$YEAR_MONTH" ]; then
    echo "${YEAR_MONTH}.$((LATEST_BUILD + 1))"
else
    echo "${YEAR_MONTH}.1"
fi