#!/usr/bin/env bash
#
# Content publish step for the environment deploy workflows
# (`.github/workflows/deploy.yml`, `.github/workflows/deploy-staging.yml`).
#
# Runs as the GitHub OIDC deploy role. Builds the SPA, uploads it to the
# environment's S3 bucket with the right cache headers, and invalidates
# CloudFront. It never touches infrastructure.
#
# Runs from the repo root. The target is resolved from, in order:
#   1. SITE_BUCKET + CLOUDFRONT_DISTRIBUTION_ID (pinned by the workflow; used by
#      dev, whose CloudFormation outputs disappear during Terraform adoption)
#   2. the BucketName/DistributionId outputs of STACK_NAME (staging)
set -euo pipefail

STACK_NAME="${STACK_NAME:-shoc-frontend-dev}"
REGION="${AWS_REGION:-us-east-1}"
WAIT_FOR_INVALIDATION="${WAIT_FOR_INVALIDATION:-false}"

echo "Building SPA (VITE_API_URL comes from the process environment or .env.production)..."
export VITE_APP_COMMIT_SHA="${VITE_APP_COMMIT_SHA:-${GITHUB_SHA:-}}"
npm ci
npm run build

BUCKET="${SITE_BUCKET:-}"
DIST_ID="${CLOUDFRONT_DISTRIBUTION_ID:-}"

if [[ -n "${BUCKET}" && -n "${DIST_ID}" ]]; then
  echo "Using pinned target: bucket ${BUCKET}, distribution ${DIST_ID}."
elif [[ -n "${BUCKET}" || -n "${DIST_ID}" ]]; then
  echo "::error::Set both SITE_BUCKET and CLOUDFRONT_DISTRIBUTION_ID, or neither." >&2
  exit 1
else
  echo "Reading stack outputs from ${STACK_NAME}..."
  stack_output() {
    aws cloudformation describe-stacks \
      --stack-name "${STACK_NAME}" \
      --region "${REGION}" \
      --query "Stacks[0].Outputs[?OutputKey=='$1'].OutputValue" \
      --output text
  }

  BUCKET="$(stack_output BucketName)"
  DIST_ID="$(stack_output DistributionId)"

  if [[ -z "${BUCKET}" || "${BUCKET}" == "None" || -z "${DIST_ID}" || "${DIST_ID}" == "None" ]]; then
    echo "::error::Could not resolve BucketName/DistributionId from stack ${STACK_NAME}." >&2
    exit 1
  fi
fi

echo "Uploading hashed assets (immutable) to s3://${BUCKET}..."
# Everything except index.html: long-lived + immutable, prune stale objects.
aws s3 sync dist/ "s3://${BUCKET}/" \
  --delete \
  --exclude "index.html" \
  --exclude "*.map" \
  --cache-control "public,max-age=31536000,immutable"

echo "Uploading index.html (never cached)..."
aws s3 cp dist/index.html "s3://${BUCKET}/index.html" \
  --cache-control "no-cache,no-store,must-revalidate" \
  --content-type "text/html"

echo "Invalidating CloudFront ${DIST_ID}..."
INVALIDATION_ID="$(aws cloudfront create-invalidation \
  --distribution-id "${DIST_ID}" \
  --paths "/*" \
  --query 'Invalidation.Id' \
  --output text)"

if [[ "${WAIT_FOR_INVALIDATION}" == "true" ]]; then
  echo "Waiting for CloudFront invalidation ${INVALIDATION_ID}..."
  aws cloudfront wait invalidation-completed \
    --distribution-id "${DIST_ID}" \
    --id "${INVALIDATION_ID}"
fi

echo "Web deploy complete."