#!/bin/bash
#
# Release Notes Generation Library
#
# Generates markdown release notes from git commit history.
#

set -e
set -u

generate_release_notes() {
    local LAST_TAG="$1"
    local NEW_TAG="$2"
    local DEPLOYED_SERVICES="${3:-}"

    cat <<EOF
# Release $NEW_TAG

**Release Date**: $(date -u +"%Y-%m-%d %H:%M UTC")
**Previous Version**: $LAST_TAG
**Commits**: $(git log ${LAST_TAG}..HEAD --oneline --no-merges | wc -l)

## Changes

### Features
$(git log ${LAST_TAG}..HEAD --oneline --no-merges --grep='^feat' | sed 's/^[a-f0-9]* /- /' || echo "- None")

### Fixes
$(git log ${LAST_TAG}..HEAD --oneline --no-merges --grep='^fix' | sed 's/^[a-f0-9]* /- /' || echo "- None")

### Improvements
$(git log ${LAST_TAG}..HEAD --oneline --no-merges --grep='^refactor\|^perf' | sed 's/^[a-f0-9]* /- /' || echo "- None")

### Other Changes
$(git log ${LAST_TAG}..HEAD --oneline --no-merges --grep='^chore\|^docs\|^test' | head -5 | sed 's/^[a-f0-9]* /- /' || echo "- None")

## Deployment

$(if [ -n "$DEPLOYED_SERVICES" ]; then
    echo "### Deployed Services"
    echo "$DEPLOYED_SERVICES" | tr ' ' '\n' | sed 's/^/- /'
else
    echo "Full deployment (all services)"
fi)

## Build Information

- **Commit**: $(git rev-parse HEAD)
- **Branch**: $(git rev-parse --abbrev-ref HEAD)
- **Build Time**: $(date -u +"%Y-%m-%d %H:%M:%S UTC")
- **Deployment Method**: Blue-green zero-downtime

## Verification

Health checks passed for all deployed services.
Zero-downtime deployment completed successfully.

---

🤖 Generated with Release Automation System
EOF
}

# Export functions
export -f generate_release_notes