#!/usr/bin/env bash
# exchange-monitor 启动脚本
# 自动检测端口占用并清理旧进程

set -e

cd "$(dirname "$0")"
PORT=8888
BIN="./exchange-monitor"
LOG="exchange-monitor.log"

# 检查端口占用，释放旧进程
PID=$(ss -tlnp 2>/dev/null | grep ":$PORT " | sed -n 's/.*pid=\([0-9]*\).*/\1/p')
if [ -n "$PID" ]; then
    echo "[start] Port $PORT 被 PID=$PID 占用，尝试优雅停止..."
    kill "$PID" 2>/dev/null || true
    sleep 1
    # 强制清理
    if kill -0 "$PID" 2>/dev/null; then
        echo "[start] 强制终止 PID=$PID..."
        kill -9 "$PID" 2>/dev/null || true
        sleep 1
    fi
fi

# 确认端口空闲
if ss -tlnp 2>/dev/null | grep -q ":$PORT "; then
    echo "[start] ERROR: 端口 $PORT 仍被占用，放弃启动"
    exit 1
fi

# 编译（如果源码有变更）
if [ ! -x "$BIN" ] || [ "$(find . -name '*.go' -newer "$BIN" 2>/dev/null | head -1)" ]; then
    echo "[start] 编译新二进制..."
    go build -o "$BIN" . 2>&1
fi

# 启动
echo "[start] 启动 exchange-monitor (端口 $PORT)..."
nohup "$BIN" >> "$LOG" 2>&1 &
PID=$!
echo "[start] PID=$PID"

# 等待就绪
for i in $(seq 1 10); do
    if ss -tlnp 2>/dev/null | grep -q ":$PORT "; then
        echo "[start] 就绪 (${i}s)"
        echo "[start] http://localhost:$PORT"
        exit 0
    fi
    sleep 1
done

echo "[start] 启动超时（10s），请检查日志: tail -f $LOG"
exit 1