#!/bin/sh
# 按目标 OS/ARCH 下载 kubectl（Docker 构建 / 本地脚本共用）// Logan.Li
set -eu

KUBECTL_VERSION="${KUBECTL_VERSION:-v1.32.2}"
TARGET_OS="${TARGET_OS:-linux}"
TARGET_ARCH="${TARGET_ARCH:-amd64}"
DEST="${1:-/usr/local/bin/kubectl}"

case "${TARGET_ARCH}" in
    amd64|x86_64)  KARCH=amd64 ;;
    arm64|aarch64) KARCH=arm64 ;;
    *)
        echo "[install-kubectl] 不支持的架构: ${TARGET_ARCH}" >&2
        exit 1
        ;;
esac

# 容器内固定 linux；本地 Mac 调试可 TARGET_OS=darwin
case "${TARGET_OS}" in
    linux|darwin) ;;
    *)
        echo "[install-kubectl] 不支持的平台: ${TARGET_OS}" >&2
        exit 1
        ;;
esac

PRIMARY="https://dl.k8s.io/release/${KUBECTL_VERSION}/bin/${TARGET_OS}/${KARCH}/kubectl"
FALLBACK="https://storage.googleapis.com/kubernetes-release/release/${KUBECTL_VERSION}/bin/${TARGET_OS}/${KARCH}/kubectl"
MIRROR_CN="https://mirrors.aliyun.com/kubernetes/release/${KUBECTL_VERSION}/bin/${TARGET_OS}/${KARCH}/kubectl"

echo "[install-kubectl] ${TARGET_OS}/${KARCH} ${KUBECTL_VERSION} -> ${DEST}"

# --max-time 120 限制单次下载总时长，--connect-timeout 20 限制连接阶段 // Logan.Li
if curl -fsSL --retry 3 --retry-delay 2 --connect-timeout 20 --max-time 120 "${PRIMARY}" -o "${DEST}"; then
    :
elif curl -fsSL --retry 3 --retry-delay 2 --connect-timeout 20 --max-time 120 "${MIRROR_CN}" -o "${DEST}"; then
    echo "[install-kubectl] 使用阿里云镜像: ${MIRROR_CN}"
elif curl -fsSL --retry 3 --retry-delay 2 --connect-timeout 20 --max-time 120 "${FALLBACK}" -o "${DEST}"; then
    echo "[install-kubectl] 使用备用源: ${FALLBACK}"
else
    echo "[install-kubectl] 下载失败: ${PRIMARY}" >&2
    exit 1
fi

chmod +x "${DEST}"
"${DEST}" version --client=true 2>/dev/null || true