#!/usr/bin/env bash
# Updates homebrew/shipwright.rb with SHA256 hashes from the release artifacts.
# Downloads each tarball, computes SHA256, and updates the formula in-place.
#
# Usage: scripts/update-homebrew-sha.sh <version-tag>
#   Example: scripts/update-homebrew-sha.sh v0.4.2
#
# Run after release artifacts are uploaded to GitHub Releases.
set -euo pipefail

TAG="${1:-}"
if [[ -z "$TAG" ]]; then
    echo "Usage: scripts/update-homebrew-sha.sh <version-tag>" >&2
    echo "  Example: scripts/update-homebrew-sha.sh v3.0.0" >&2
    exit 1
fi
VERSION_NUM="${TAG#v}"
REPO="${SHIPWRIGHT_GITHUB_REPO:-sethdford/shipwright}"
REPO_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
FORMULA="${REPO_ROOT}/homebrew/shipwright.rb"
BASE_URL="https://github.com/${REPO}/releases/download/${TAG}"

TMPDIR="${TMPDIR:-/tmp}/shipwright-sha-$$"
mkdir -p "$TMPDIR"
trap 'rm -rf "$TMPDIR"' EXIT

# Download each artifact and compute SHA256
sha_darwin_arm64=""
sha_darwin_x86_64=""
sha_linux_x86_64=""

for platform in darwin-arm64 darwin-x86_64 linux-x86_64; do
  filename="shipwright-${platform}.tar.gz"
  url="${BASE_URL}/${filename}"
  dest="${TMPDIR}/${filename}"
  echo "Downloading ${url}..."
  if ! curl -sfL -o "$dest" "$url"; then
    echo "ERROR: Failed to download $url" >&2
    exit 1
  fi
  if command -v shasum >/dev/null 2>&1; then
    sha=$(shasum -a 256 "$dest" | awk '{print $1}')
  else
    sha=$(sha256sum "$dest" | awk '{print $1}')
  fi
  case "$platform" in
    darwin-arm64)   sha_darwin_arm64="$sha" ;;
    darwin-x86_64)  sha_darwin_x86_64="$sha" ;;
    linux-x86_64)   sha_linux_x86_64="$sha" ;;
  esac
  echo "  ${platform}: ${sha}"
done

# Update formula: version and SHA256 values
# The formula has 3 sha256 lines in order: darwin-arm64, darwin-x86_64, linux-x86_64
# We use awk to replace them positionally so re-releases work (not just placeholder matches)
awk -v ver="$VERSION_NUM" \
    -v sha1="$sha_darwin_arm64" \
    -v sha2="$sha_darwin_x86_64" \
    -v sha3="$sha_linux_x86_64" \
    -v n=0 '
    /^  version "/ { $0 = "  version \"" ver "\"" }
    /sha256 "/ { n++; if (n==1) sub(/sha256 "[^"]*"/, "sha256 \"" sha1 "\"");
                       if (n==2) sub(/sha256 "[^"]*"/, "sha256 \"" sha2 "\"");
                       if (n==3) sub(/sha256 "[^"]*"/, "sha256 \"" sha3 "\"") }
    { print }
' "$FORMULA" > "${FORMULA}.tmp" && mv "${FORMULA}.tmp" "$FORMULA"

echo ""
echo "Updated $FORMULA for v${VERSION_NUM}:"
echo "  darwin-arm64:   ${sha_darwin_arm64}"
echo "  darwin-x86_64:  ${sha_darwin_x86_64}"
echo "  linux-x86_64:   ${sha_linux_x86_64}"