#!/bin/sh
# ================================================================
#  install-gitea-runner.sh
#  Installation automatisée d'un runner Gitea Actions
#
#  Usage:
#    sudo ./install-gitea-runner.sh <TOKEN> <NAME> <LABELS>
#
#  Exemple (Alpine) :
#    doas ./install-gitea-runner.sh abc123 "dev-lab" "self-hosted,lab,docker,obsigate"
#
#  Exemple (Debian) :
#    sudo ./install-gitea-runner.sh abc123 "dev-lab" "self-hosted,lab,docker,obsigate"
#
#  ⚠️  Doit être exécuté en root (sudo / doas)
# ================================================================
set -e

TOKEN="$1"
NAME="$2"
LABELS="$3"

if [ -z "$TOKEN" ] || [ -z "$NAME" ] || [ -z "$LABELS" ]; then
    echo "❌ Usage: sudo ./install-gitea-runner.sh <TOKEN> <NAME> <LABELS>"
    echo "   Example: sudo ./install-gitea-runner.sh abc123 dev-lab 'self-hosted,lab,docker,obsigate'"
    exit 1
fi

# ── 0. Require root — auto-elevate if possible ────────────────────
if [ "$(id -u)" -ne 0 ]; then
    # Try to re-execute with available privilege escalation
    if command -v sudo >/dev/null 2>&1; then
        exec sudo "$0" "$@"
    elif command -v doas >/dev/null 2>&1; then
        exec doas "$0" "$@"
    else
        echo "❌ This script must be run as root."
        echo "   Install sudo or doas, or run as root directly."
        exit 1
    fi
fi

# ── 0. Detect OS + privilege elevation method ──────────────────────
if [ -f /etc/alpine-release ]; then
    OS="alpine"
    # Alpine: utilise doas, mais si on est déjà root (via doas), on continue
    # On vérifie juste que curl et les outils de base sont là
elif [ -f /etc/debian_version ]; then
    OS="debian"
elif [ -f /etc/arch-release ]; then
    OS="arch"
else
    echo "⚠️  Unknown OS — assuming Debian-based"
    OS="debian"
fi
echo "🖥️  Detected OS: $OS"

# ── 1. Install prerequisites ──────────────────────────────────────
echo "[1/5] Installing prerequisites..."
if [ "$OS" = "alpine" ]; then
    apk add --no-cache curl docker > /dev/null 2>&1
    rc-update add docker boot 2>/dev/null || true
    service docker start 2>/dev/null || true
elif [ "$OS" = "debian" ]; then
    apt-get update -qq
    apt-get install -y -qq docker.io curl
elif [ "$OS" = "arch" ]; then
    pacman -S --noconfirm docker curl
    systemctl enable --now docker
fi
echo "   ✅ Prerequisites OK (curl, docker)"

# ── 2. Download runner ─────────────────────────────────────────────
echo "[2/5] Downloading Gitea act_runner v0.2.11..."
ARCH=$(uname -m)
case "$ARCH" in
    x86_64)  RUNNER_ARCH="amd64" ;;
    aarch64) RUNNER_ARCH="arm64" ;;
    armv7l)  RUNNER_ARCH="armv7" ;;
    *)       echo "❌ Unsupported architecture: $ARCH"; exit 1 ;;
esac

RUNNER_URL="https://dl.gitea.com/act_runner/0.2.11/act_runner-0.2.11-linux-${RUNNER_ARCH}"
curl -sL -o /usr/local/bin/act_runner "$RUNNER_URL"
chmod +x /usr/local/bin/act_runner
echo "   ✅ act_runner v0.2.11 installed"

# ── 3. Register ────────────────────────────────────────────────────
echo "[3/5] Registering runner with Gitea..."
/usr/local/bin/act_runner register \
    --no-interactive \
    --instance https://git.dracodev.net \
    --token "$TOKEN" \
    --name "$NAME" \
    --labels "$LABELS"
echo "   ✅ Runner registered"

# ── 4. Install as service ─────────────────────────────────────────
echo "[4/5] Installing as system service..."

if [ "$OS" = "alpine" ]; then
    # Alpine OpenRC — le script est exécuté en root via doas
    cat > /etc/init.d/gitea-runner <<'OPENRC_EOF'
#!/sbin/openrc-run
name="Gitea Actions Runner"
command="/usr/local/bin/act_runner"
command_args="daemon"
command_background=true
pidfile="/run/${RC_SVCNAME}.pid"
output_log="/var/log/gitea-runner.log"
error_log="/var/log/gitea-runner.log"
OPENRC_EOF
    chmod +x /etc/init.d/gitea-runner
    rc-update add gitea-runner default
    service gitea-runner start
else
    # Systemd (Debian, Arch)
    # act_runner cherche .runner dans WorkingDirectory → home de l'utilisateur
    TARGET_USER="${SUDO_USER:-bruno}"
    TARGET_HOME=$(eval echo "~$TARGET_USER")
    cat > /etc/systemd/system/gitea-runner.service <<SYSTEMD_EOF
[Unit]
Description=Gitea Actions Runner ($NAME)
After=network.target docker.service
Requires=docker.service

[Service]
ExecStart=/usr/local/bin/act_runner daemon
WorkingDirectory=$TARGET_HOME
User=$TARGET_USER
Restart=always
RestartSec=5

[Install]
WantedBy=multi-user.target
SYSTEMD_EOF
    systemctl daemon-reload
    systemctl enable --now gitea-runner
fi
echo "   ✅ Service installed and started"

# ── 5. Verify ──────────────────────────────────────────────────────
echo "[5/5] Verifying..."
sleep 2
if [ "$OS" = "alpine" ]; then
    service gitea-runner status 2>&1 | head -3
else
    systemctl status gitea-runner --no-pager -l 2>&1 | head -5
fi

echo ""
echo "============================================="
echo "  ✅ Runner '$NAME' installed successfully!"
echo "  Labels : $LABELS"
echo "  Vérifier dans Gitea → Admin → Runners"
echo "============================================="