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

# Build release metadata from git for controlled upgrades.
# Usage:
#   scripts/ops/netgescon-release-build.sh v1.3.0

if [[ $# -lt 1 ]]; then
  echo "Usage: $0 <version-tag>"
  echo "Example: $0 v1.3.0"
  exit 1
fi

VERSION_TAG="$1"
REPO_ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
RELEASE_DIR="$REPO_ROOT/releases"
META_DIR="$RELEASE_DIR/$VERSION_TAG"

mkdir -p "$META_DIR"

pushd "$REPO_ROOT" >/dev/null

if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
  echo "Error: not a git repository: $REPO_ROOT"
  exit 1
fi

if ! git rev-parse "$VERSION_TAG" >/dev/null 2>&1; then
  echo "Error: git tag/commit '$VERSION_TAG' not found"
  exit 1
fi

COMMIT_SHA="$(git rev-parse "$VERSION_TAG")"
BUILD_TIME_UTC="$(date -u +"%Y-%m-%dT%H:%M:%SZ")"

# Save release notes from the previous tag to this tag when possible.
PREV_TAG="$(git tag --sort=-version:refname | grep -vx "$VERSION_TAG" | head -n1 || true)"
if [[ -n "$PREV_TAG" ]]; then
  git --no-pager log --pretty=format:'- %h %s (%an)' "$PREV_TAG..$VERSION_TAG" > "$META_DIR/CHANGELOG_FRAGMENT.md"
else
  git --no-pager log --pretty=format:'- %h %s (%an)' "$VERSION_TAG" > "$META_DIR/CHANGELOG_FRAGMENT.md"
fi

cat > "$META_DIR/release-manifest.json" <<EOF
{
  "version": "$VERSION_TAG",
  "commit": "$COMMIT_SHA",
  "built_at_utc": "$BUILD_TIME_UTC",
  "php_required": "^8.2",
  "laravel_migrate_required": true,
  "post_deploy_commands": [
    "php artisan migrate --force",
    "php artisan optimize:clear",
    "php artisan optimize"
  ]
}
EOF

# Checksum for integrity checks in deployment pipeline.
sha256sum "$META_DIR/release-manifest.json" > "$META_DIR/release-manifest.sha256"

popd >/dev/null

echo "Release metadata generated: $META_DIR"