#!/bin/bash
# release.sh - Build a release artifact and create a Gitea release via `tea`
#
# Usage:
#   scripts/release.sh [VERSION]
#
# If VERSION is not given, it is read from the latest git tag (e.g. v0.1.5).
# Falls back to "dev" if no tag is found.
#
# Steps:
#   1. Validate toolchain (git, go, tar, tea)
#   2. Determine version
#   3. Build orca binary with version injection via -ldflags
#   4. Package as tarball: orca-${VERSION}-${OS}-${ARCH}.tar.gz
#   5. Generate release notes from `---ci---` blocks since last tag
#   6. Invoke `tea releases create` to publish to Gitea
#
# Requires:
#   - GITEA_TOKEN environment variable
#   - `tea` CLI on PATH (https://gitea.com/gitea/tea)
#
# Idempotent: tea releases create will fail if the release already exists;
# the script surfaces that error rather than silently swallowing it.

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/.." && pwd)"
cd "$REPO_ROOT"

# Source .env for GITEA_TOKEN if present
for env_file in "$REPO_ROOT/.env" "$PWD/.env" "./.env"; do
  if [ -f "$env_file" ]; then
    set -a
    # shellcheck disable=SC1090
    . "$env_file"
    set +a
    break
  fi
done

# --- helpers --------------------------------------------------------------

err() { echo "release: error: $*" >&2; exit 1; }
info() { echo "release: $*"; }

require_tool() {
  command -v "$1" >/dev/null 2>&1 || err "required tool not found: $1"
}

# --- preflight ------------------------------------------------------------

require_tool git
require_tool go
require_tool tar

if [ -z "${GITEA_TOKEN:-}" ]; then
  err "GITEA_TOKEN is not set. Export it or put it in .env"
fi

if ! command -v tea >/dev/null 2>&1; then
  err "tea CLI not found on PATH. Install from https://gitea.com/gitea/tea"
fi

# --- version detection ----------------------------------------------------

VERSION="${1:-}"
if [ -z "$VERSION" ]; then
  VERSION="$(git describe --tags --abbrev=0 2>/dev/null || echo dev)"
fi
# Strip leading 'v' for the tarball name (we keep it in the release tag itself)
VERSION_NUMBER="${VERSION#v}"

info "version: $VERSION"
info "building..."

# --- build with version injection ----------------------------------------

GIT_COMMIT="$(git rev-parse --short HEAD)"
BUILD_TIME="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
LDFLAGS="-s -w -X git.cloudinit.dev/coreci/orca/internal/cli.version=$VERSION -X git.cloudinit.dev/coreci/orca/internal/cli.gitCommit=$GIT_COMMIT -X git.cloudinit.dev/coreci/orca/internal/cli.buildTime=$BUILD_TIME"

mkdir -p bin
go build -trimpath -ldflags="$LDFLAGS" -o bin/orca ./cmd/orca
info "built: bin/orca"

# --- tarball --------------------------------------------------------------

OS="$(uname -s | tr '[:upper:]' '[:lower:]')"
ARCH="$(uname -m)"
case "$ARCH" in
  x86_64) ARCH=amd64 ;;
  aarch64) ARCH=arm64 ;;
  armv7l) ARCH=armv7 ;;
esac

TARBALL="orca-${VERSION}-${OS}-${ARCH}.tar.gz"
tar -czf "$TARBALL" -C bin orca
info "packaged: $TARBALL ($(du -h "$TARBALL" | cut -f1))"

# --- release notes from ---ci--- blocks ----------------------------------

NOTES_FILE="$(mktemp)"
trap 'rm -f "$NOTES_FILE"' EXIT

{
  echo "# Release $VERSION"
  echo ""
  echo "_Built: $BUILD_TIME from $GIT_COMMIT"
  echo ""

  PREV_TAG="$(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || echo "")"
  if [ -n "$PREV_TAG" ]; then
    RANGE="$PREV_TAG..HEAD"
  else
    RANGE="HEAD"
  fi

  echo "## Changes since $PREV_TAG"
  echo ""
  # Extract messages of ---ci--- tagged commits in the range
  git log --pretty=format:'- %s' "$RANGE" 2>/dev/null | head -100 || true
  echo ""
} > "$NOTES_FILE"

info "release notes: $NOTES_FILE"
cat "$NOTES_FILE"

# --- publish to gitea -----------------------------------------------------

info "creating gitea release..."
tea releases create "$VERSION" \
  --repo "$REPO" \
  --title "Orca $VERSION" \
  --note-file "$NOTES_FILE" \
  --asset "$TARBALL"

info "✓ release $VERSION published"