#!/usr/bin/env bash
set -euo pipefail

############################################
# Clash for Linux - start.sh (Full Version)
############################################

# 加载系统函数库(Only for RHEL Linux)
[ -f /etc/init.d/functions ] && source /etc/init.d/functions

#################### 脚本初始化任务 ####################

# 获取脚本工作目录绝对路径
export Server_Dir
Server_Dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

# 加载.env变量文件
source "$Server_Dir/.env"

# 给二进制启动程序、脚本等添加可执行权限
chmod +x "$Server_Dir/bin/"* 2>/dev/null || true
chmod +x "$Server_Dir/scripts/"* 2>/dev/null || true
if [ -f "$Server_Dir/tools/subconverter/subconverter" ]; then
  chmod +x "$Server_Dir/tools/subconverter/subconverter" 2>/dev/null || true
fi

#################### 变量设置 ####################

Conf_Dir="$Server_Dir/conf"
Temp_Dir="$Server_Dir/temp"
Log_Dir="$Server_Dir/logs"

PID_FILE="${CLASH_PID_FILE:-$Temp_Dir/clash.pid}"

# 将 CLASH_URL 变量的值赋给 URL 变量，并检查 CLASH_URL 是否为空
URL=${CLASH_URL:?Error: CLASH_URL variable is not set or empty}

# 获取 CLASH_SECRET 值，如果不存在则生成一个随机数
Secret=${CLASH_SECRET:-$(openssl rand -hex 32)}

# 设置默认值
CLASH_HTTP_PORT=${CLASH_HTTP_PORT:-7890}
CLASH_SOCKS_PORT=${CLASH_SOCKS_PORT:-7891}
CLASH_REDIR_PORT=${CLASH_REDIR_PORT:-7892}
CLASH_LISTEN_IP=${CLASH_LISTEN_IP:-0.0.0.0}
CLASH_ALLOW_LAN=${CLASH_ALLOW_LAN:-false}

EXTERNAL_CONTROLLER_ENABLED=${EXTERNAL_CONTROLLER_ENABLED:-true}
EXTERNAL_CONTROLLER=${EXTERNAL_CONTROLLER:-127.0.0.1:9090}

ALLOW_INSECURE_TLS=${ALLOW_INSECURE_TLS:-false}

# 端口与配置工具
source "$Server_Dir/scripts/port_utils.sh"
CLASH_HTTP_PORT="$(resolve_port_value "HTTP" "$CLASH_HTTP_PORT")"
CLASH_SOCKS_PORT="$(resolve_port_value "SOCKS" "$CLASH_SOCKS_PORT")"
CLASH_REDIR_PORT="$(resolve_port_value "REDIR" "$CLASH_REDIR_PORT")"
EXTERNAL_CONTROLLER="$(resolve_host_port "External Controller" "$EXTERNAL_CONTROLLER" "0.0.0.0")"

source "$Server_Dir/scripts/config_utils.sh"

#################### 函数定义 ####################

# 自定义action函数，实现通用action功能
success() {
  echo -en "\033[60G[\033[1;32m OK \033[0;39m]\r"
  return 0
}

failure() {
  local rc=$?
  echo -en "\033[60G[\033[1;31mFAILED\033[0;39m]\r"
  [ -x /bin/plymouth ] && /bin/plymouth --details
  return $rc
}

action() {
  local STRING rc
  STRING=$1
  echo -n "$STRING "
  shift
  "$@" && success $"$STRING" || failure $"$STRING"
  rc=$?
  echo
  return $rc
}

# 判断命令是否正常执行 函数
if_success() {
  local ReturnStatus=$3
  if [ "$ReturnStatus" -eq 0 ]; then
    action "$1" /bin/true
  else
    action "$2" /bin/false
    exit 1
  fi
}

#################### 任务执行 ####################

mkdir -p "$Conf_Dir" "$Temp_Dir" "$Log_Dir"

## 获取CPU架构信息
source "$Server_Dir/scripts/get_cpu_arch.sh"

# Check if we obtained CPU architecture
if [[ -z "${CpuArch:-}" ]]; then
  echo "Failed to obtain CPU architecture"
  exit 1
fi

source "$Server_Dir/scripts/resolve_clash.sh"

## 临时取消环境变量
unset http_proxy https_proxy no_proxy HTTP_PROXY HTTPS_PROXY NO_PROXY || true

## Clash 订阅地址检测及配置文件下载

# 检查url是否有效
echo -e '\n正在检测订阅地址...'
Text1="Clash订阅地址可访问！"
Text2="Clash订阅地址不可访问！"

# 构建检测 curl 命令，添加自定义请求头
CHECK_CMD=(curl -o /dev/null -L -sS --retry 5 -m 10 --connect-timeout 10 -w "%{http_code}")

if [ "$ALLOW_INSECURE_TLS" = "true" ]; then
  CHECK_CMD+=(-k)
  echo -e "\033[33m[WARN] 已启用不安全的 TLS 下载（跳过证书校验）\033[0m"
fi

if [ -n "${CLASH_HEADERS:-}" ]; then
  CHECK_CMD+=(-H "$CLASH_HEADERS")
fi

CHECK_CMD+=("$URL")

status_code="$("${CHECK_CMD[@]}")"
echo "$status_code" | grep -E '^[23][0-9]{2}$' &>/dev/null
ReturnStatus=$?
if_success "$Text1" "$Text2" "$ReturnStatus"

# 拉取更新config.yml文件
echo -e '\n正在下载Clash配置文件...'
Text3="配置文件config.yaml下载成功！"
Text4="配置文件config.yaml下载失败，退出启动！"

# 构建 curl 命令，添加自定义请求头
CURL_CMD=(curl -L -sS --retry 5 -m 10 -o "$Temp_Dir/clash.yaml")

if [ "$ALLOW_INSECURE_TLS" = "true" ]; then
  CURL_CMD+=(-k)
fi

if [ -n "${CLASH_HEADERS:-}" ]; then
  CURL_CMD+=(-H "$CLASH_HEADERS")
fi

CURL_CMD+=("$URL")

# 尝试使用curl进行下载
"${CURL_CMD[@]}"
ReturnStatus=$?

if [ $ReturnStatus -ne 0 ]; then
  # 如果使用curl下载失败，尝试使用wget进行下载
  WGET_CMD=(wget -q -O "$Temp_Dir/clash.yaml")

  if [ "$ALLOW_INSECURE_TLS" = "true" ]; then
    WGET_CMD+=(--no-check-certificate)
  fi

  if [ -n "${CLASH_HEADERS:-}" ]; then
    WGET_CMD+=(--header="$CLASH_HEADERS")
  fi

  WGET_CMD+=("$URL")

  for i in {1..10}; do
    "${WGET_CMD[@]}"
    ReturnStatus=$?
    if [ $ReturnStatus -eq 0 ]; then
      break
    else
      continue
    fi
  done
fi

if_success "$Text3" "$Text4" "$ReturnStatus"

# 重命名clash配置文件
\cp -a "$Temp_Dir/clash.yaml" "$Temp_Dir/clash_config.yaml"

## 判断订阅内容是否符合clash配置文件标准，尝试转换（需 subconverter 可执行文件支持）
source "$Server_Dir/scripts/resolve_subconverter.sh"

if [ "${Subconverter_Ready:-false}" = "true" ]; then
  echo -e '\n判断订阅内容是否符合clash配置文件标准:'
  export SUBCONVERTER_BIN="$Subconverter_Bin"
  bash "$Server_Dir/scripts/clash_profile_conversion.sh"
  sleep 3
else
  echo -e "\033[33m[WARN] 未检测到可用的 subconverter，跳过订阅转换\033[0m"
fi

## Clash 配置文件重新格式化及配置

# 取出代理相关配置
sed -n '/^proxies:/,$p' "$Temp_Dir/clash_config.yaml" > "$Temp_Dir/proxy.txt"

# 合并形成新的config.yaml，并替换配置占位符
cat "$Temp_Dir/templete_config.yaml" > "$Temp_Dir/config.yaml"
cat "$Temp_Dir/proxy.txt" >> "$Temp_Dir/config.yaml"

# 替换配置文件中的占位符为环境变量值
sed -i "s/CLASH_HTTP_PORT_PLACEHOLDER/${CLASH_HTTP_PORT}/g" "$Temp_Dir/config.yaml"
sed -i "s/CLASH_SOCKS_PORT_PLACEHOLDER/${CLASH_SOCKS_PORT}/g" "$Temp_Dir/config.yaml"
sed -i "s/CLASH_REDIR_PORT_PLACEHOLDER/${CLASH_REDIR_PORT}/g" "$Temp_Dir/config.yaml"
sed -i "s/CLASH_LISTEN_IP_PLACEHOLDER/${CLASH_LISTEN_IP}/g" "$Temp_Dir/config.yaml"
sed -i "s/CLASH_ALLOW_LAN_PLACEHOLDER/${CLASH_ALLOW_LAN}/g" "$Temp_Dir/config.yaml"

# 配置 external-controller
if [ "$EXTERNAL_CONTROLLER_ENABLED" = "true" ]; then
  sed -i "s/EXTERNAL_CONTROLLER_PLACEHOLDER/${EXTERNAL_CONTROLLER}/g" "$Temp_Dir/config.yaml"
else
  # 如果禁用 external-controller，则注释掉该行
  sed -i "s/external-controller: 'EXTERNAL_CONTROLLER_PLACEHOLDER'/# external-controller: disabled/g" "$Temp_Dir/config.yaml"
fi

apply_tun_config "$Temp_Dir/config.yaml"
apply_mixin_config "$Temp_Dir/config.yaml" "$Server_Dir"

\cp "$Temp_Dir/config.yaml" "$Conf_Dir/"

# Configure Clash Dashboard
Work_Dir="$(cd "$(dirname "$0")" && pwd)"
Dashboard_Dir="${Work_Dir}/dashboard/public"

if [ "$EXTERNAL_CONTROLLER_ENABLED" = "true" ]; then
  sed -ri "s@^# external-ui:.*@external-ui: ${Dashboard_Dir}@g" "$Conf_Dir/config.yaml"
fi

sed -r -i "/^secret: /s@(secret: ).*@\1${Secret}@g" "$Conf_Dir/config.yaml"

## 启动Clash服务
echo -e '\n正在启动Clash服务...'
Text5="服务启动成功！"
Text6="服务启动失败！"

Clash_Bin="$(resolve_clash_bin "$Server_Dir" "$CpuArch")"
ReturnStatus=$?

if [ $ReturnStatus -eq 0 ]; then
  nohup "$Clash_Bin" -d "$Conf_Dir" &> "$Log_Dir/clash.log" &
  PID=$!
  ReturnStatus=$?
  if [ $ReturnStatus -eq 0 ]; then
    echo "$PID" > "$PID_FILE"
  fi
fi

if_success "$Text5" "$Text6" "$ReturnStatus"

# Output Dashboard access address and Secret
echo ''
if [ "$EXTERNAL_CONTROLLER_ENABLED" = "true" ]; then
  echo -e "Clash Dashboard 访问地址: http://${EXTERNAL_CONTROLLER}/ui"
  echo -e "Secret: ${Secret}"
else
  echo -e "External Controller (Dashboard) 已禁用"
fi
echo ''

# 添加环境变量 - 使用配置的端口
Env_File="${CLASH_ENV_FILE:-}"

if [ "$Env_File" = "off" ] || [ "$Env_File" = "disabled" ]; then
  echo -e "\033[33m[WARN] 已关闭环境变量文件生成\033[0m"
else
  if [ -z "$Env_File" ]; then
    if [ -w /etc/profile.d ]; then
      Env_File="/etc/profile.d/clash-for-linux.sh"
    else
      Env_File="$Temp_Dir/clash-for-linux.sh"
    fi
  fi

  if [ -f /etc/profile.d/clash.sh ]; then
    echo -e "\033[33m[WARN] 检测到旧版环境变量文件 /etc/profile.d/clash.sh，建议确认是否需要清理\033[0m"
  fi

  mkdir -p "$(dirname "$Env_File")"

  cat >"$Env_File"<<EOF
# 开启系统代理
function proxy_on() {
  export http_proxy=http://${CLASH_LISTEN_IP}:${CLASH_HTTP_PORT}
  export https_proxy=http://${CLASH_LISTEN_IP}:${CLASH_HTTP_PORT}
  export no_proxy=127.0.0.1,localhost
  export HTTP_PROXY=http://${CLASH_LISTEN_IP}:${CLASH_HTTP_PORT}
  export HTTPS_PROXY=http://${CLASH_LISTEN_IP}:${CLASH_HTTP_PORT}
  export NO_PROXY=127.0.0.1,localhost
  echo -e "\033[32m[√] 已开启代理\033[0m"
}

# 关闭系统代理
function proxy_off() {
  unset http_proxy
  unset https_proxy
  unset no_proxy
  unset HTTP_PROXY
  unset HTTPS_PROXY
  unset NO_PROXY
  echo -e "\033[31m[×] 已关闭代理\033[0m"
}
EOF

  echo -e "请执行以下命令加载环境变量: source ${Env_File}\n"
  echo -e "请执行以下命令开启系统代理: proxy_on\n"
  echo -e "若要临时关闭系统代理，请执行: proxy_off\n"
fi