#!/bin/bash

# Hot-Reload Dev Script for TopFans Backend
# Usage: ./dev.sh
#
# Requires: fswatch (Mac: brew install fswatch) or inotifywait (Linux)

set -e

# 信号捕获：优雅退出
cleanup() {
    echo ""
    echo -e "${YELLOW}🛑 收到停止信号，正在关闭所有服务...${NC}"

    # 先杀所有 watcher 和 debounce 进程（防止继续触发重启）
    if [ -f /tmp/dev_sh_watchers.tmp ]; then
        while read watcher_pid; do
            kill "$watcher_pid" 2>/dev/null || true
        done < /tmp/dev_sh_watchers.tmp
        rm -f /tmp/dev_sh_watchers.tmp
    fi

    # 清理所有 PID 文件并杀服务进程
    for service in gateway activityService galleryService socialService assetService userService taskService starbookService; do
        pkill -9 -f "$service" 2>/dev/null || true
        rm -f "/tmp/dev_sh_${service}.pid" "/tmp/dev_sh_${service}_restart" "/tmp/dev_sh_${service}.lock"
        echo -e "${YELLOW}  🛑 $service 已停止${NC}"
    done

    echo -e "${GREEN}✅ 所有服务已关闭${NC}"
    exit 0
}

trap cleanup SIGINT SIGTERM

RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
CYAN='\033[0;36m'
NC='\033[0m'

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

# Detect platform
if [[ "$(uname)" == "Darwin" ]]; then
    WATCHER_TOOL="fswatch"
    WATCHER_CMD="fswatch -r"
elif [[ "$(uname)" == "Linux" ]]; then
    WATCHER_TOOL="inotifywait"
    WATCHER_CMD="inotifywait -r -m -e modify,create,write"
else
    echo -e "${RED}不支持的平台${NC}"
    exit 1
fi

if ! command -v "$WATCHER_TOOL" &> /dev/null; then
    echo -e "${RED}缺少工具: $WATCHER_TOOL${NC}"
    if [[ "$(uname)" == "Darwin" ]]; then
        echo "安装方法: brew install fswatch"
    else
        echo "安装方法: sudo apt install inotify-tools  (Debian/Ubuntu)"
        echo "         sudo yum install inotify-tools    (CentOS/RHEL)"
    fi
    exit 1
fi

ENV_FILE="$SCRIPT_DIR/.env"
if [ -f "$ENV_FILE" ]; then
    echo -e "${GREEN}📄 加载 .env 文件...${NC}"
    set -a
    source "$ENV_FILE"
    set +a
fi

DB_HOST="${DB_HOST:-localhost}"
DB_PORT="${DB_PORT:-5432}"
DB_USER="${DB_USER:-haihuizhu}"
DB_PASSWORD="${DB_PASSWORD:-admin}"
DB_NAME="${DB_NAME:-top-fans}"
DB_ARGS=(-db-host="$DB_HOST" -db-port="$DB_PORT" -db-user="$DB_USER" -db-password="$DB_PASSWORD" -db-name="$DB_NAME")

# 启动一个服务
# 用法: start_service name binary port use_db
start_service() {
    local name=$1
    local binary=$2
    local port=$3
    local use_db=$4

    echo -e "${GREEN}🚀 启动 $name...${NC}"

    if [ "$use_db" = "1" ]; then
        "$SCRIPT_DIR/$binary" -port=$port "${DB_ARGS[@]}" > "/tmp/${name}.log" 2>&1 &
    else
        "$SCRIPT_DIR/$binary" -port=$port > "/tmp/${name}.log" 2>&1 &
    fi
    local pid=$!
    # 保存 PID 到文件
    echo $pid > "/tmp/dev_sh_${name}.pid"

    sleep 2

    if ps -p $pid > /dev/null 2>&1; then
        echo -e "${GREEN}✅ $name 已启动 (PID: $pid, 端口: $port)${NC}"
    else
        echo -e "${RED}❌ $name 启动失败${NC}"
        echo -e "${YELLOW}查看日志: tail -f /tmp/${name}.log${NC}"
    fi
}

# 构建一个服务（在服务目录下执行 go build）
# 用法: build_service name dir binary
build_service() {
    local name=$1
    local dir=$2
    local binary=$3

    if [ ! -d "$SCRIPT_DIR/$dir" ]; then
        echo -e "${RED}❌ $dir 目录不存在${NC}"
        return 1
    fi

    cd "$SCRIPT_DIR/$dir"
    if go build -o "$SCRIPT_DIR/$binary" . 2>&1; then
        echo -e "${GREEN}✅ $name 编译成功${NC}"
        return 0
    else
        echo -e "${RED}❌ $name 编译失败${NC}"
        return 1
    fi
}

# 重建并重启单个服务（构建成功后才杀旧进程）
# 用法: restart_service name dir binary port use_db
restart_service() {
    local name=$1
    local dir=$2
    local binary=$3
    local port=$4
    local use_db=$5
    local pid_file="/tmp/dev_sh_${name}.pid"
    local lock_file="/tmp/dev_sh_${name}.lock"

    # 加锁防止并发重启
    if [ -f "$lock_file" ]; then
        return 0
    fi
    touch "$lock_file"

    # Step 1: 编译（先编译，编译成功才杀旧进程）
    if [ ! -d "$SCRIPT_DIR/$dir" ]; then
        echo -e "${RED}❌ $dir 目录不存在，跳过${NC}"
        return 1
    fi

    cd "$SCRIPT_DIR/$dir"
    # 重试编译（最多3次）
    local max_retries=3
    local retry_count=0
    local build_success=false
    while [ $retry_count -lt $max_retries ]; do
        if go build -o "$SCRIPT_DIR/$binary" . 2>&1; then
            build_success=true
            break
        fi
        retry_count=$((retry_count + 1))
        if [ $retry_count -lt $max_retries ]; then
            echo -e "${YELLOW}⚠️  [$name] 编译失败，${retry_count}/${max_retries} 次重试...${NC}"
            sleep 1
        fi
    done
    if [ "$build_success" = false ]; then
        echo -e "${RED}❌ [$name] 编译失败 (已重试 ${max_retries} 次)，旧进程保持运行${NC}"
        echo -e "${RED}   查看详细日志: tail -f /tmp/${name}.log${NC}"
        rm -f "$lock_file"
        return 1
    fi
    echo -e "${GREEN}✅ [$name] 编译成功${NC}"

    # Step 2: 编译成功后，杀旧进程（从 PID 文件读取）
    if [ -f "$pid_file" ]; then
        local old_pid=$(cat "$pid_file")
        if [ -n "$old_pid" ] && kill -0 "$old_pid" 2>/dev/null; then
            kill "$old_pid" 2>/dev/null || true
            echo -e "${YELLOW}🛑 [$name] 旧进程 (PID: $old_pid) 已终止${NC}"
        fi
        rm -f "$pid_file"
    fi

    # Step 3: 启动新进程
    sleep 1
    cd "$SCRIPT_DIR"
    if [ "$use_db" = "1" ]; then
        "$SCRIPT_DIR/$binary" -port=$port "${DB_ARGS[@]}" > "/tmp/${name}.log" 2>&1 &
    else
        "$SCRIPT_DIR/$binary" -port=$port > "/tmp/${name}.log" 2>&1 &
    fi
    local new_pid=$!
    echo $new_pid > "$pid_file"
    sleep 2

    if ps -p $new_pid > /dev/null 2>&1; then
        echo -e "${GREEN}✅ [$name] 已重启 (PID: $new_pid)${NC}"
    else
        echo -e "${RED}❌ [$name] 重启失败，查看日志: tail -f /tmp/${name}.log${NC}"
    fi

    # 解锁
    rm -f "$lock_file"
}

# 启动文件监听器
# 用法: start_watcher name dir binary port use_db
start_watcher() {
    local name=$1
    local dir=$2
    local binary=$3
    local port=$4
    local use_db=$5
    local watch_path="$SCRIPT_DIR/$dir"
    local restart_marker="/tmp/dev_sh_${name}_restart"

    if [ ! -d "$watch_path" ]; then
        echo -e "${RED}❌ 监听目录不存在: $watch_path${NC}"
        return 1
    fi

    # 清理可能遗留的重启标记
    rm -f "$restart_marker"

    (
        if [[ "$(uname)" == "Darwin" ]]; then
            # 排除: .git目录, 测试文件, 二进制文件(无扩展名), .exe, bin/目录
            fswatch -r "$watch_path" \
                --exclude='\.git' \
                --exclude='_test\.go$' \
                --exclude='\.exe$' \
                --exclude='gateway$' \
                --exclude='userService$' \
                --exclude='assetService$' \
                --exclude='socialService$' \
                --exclude='galleryService$' \
                --exclude='activityService$' \
                --exclude='taskService$' \
                --exclude='starbookService$'
        else
            inotifywait -r -m -e modify,create,write "$watch_path" \
                --exclude='\.git' \
                --exclude='_test\.go$' \
                --exclude='\.exe$' \
                --exclude='gateway$' \
                --exclude='userService$' \
                --exclude='assetService$' \
                --exclude='socialService$' \
                --exclude='galleryService$' \
                --exclude='activityService$' \
                --exclude='taskService$' \
                --exclude='starbookService$'
        fi | while read event; do
            # 时间戳防抖：每次事件更新标记文件
            # Darwin 不支持 date +%s%N，使用 python 获取纳秒时间戳
            if [[ "$(uname)" == "Darwin" ]]; then
                python3 -c 'import time; print(int(time.time()*1e9))' > "$restart_marker"
            else
                date +%s%N > "$restart_marker"
            fi
        done
    ) &
    local watcher_pid=$!
    echo "$watcher_pid" >> /tmp/dev_sh_watchers.tmp
    echo -e "${GREEN}👁️  [$name] 文件监听器已启动 (PID: $watcher_pid)${NC}"

    # 后台防抖循环：每 300ms 检查一次是否需要重启
    (
        while true; do
            sleep 0.3
            if [ ! -f "$restart_marker" ]; then
                continue
            fi
            local now
            if [[ "$(uname)" == "Darwin" ]]; then
                now=$(python3 -c 'import time; print(int(time.time()*1e9))')
            else
                now=$(date +%s%N)
            fi
            local last_time=$(cat "$restart_marker" 2>/dev/null || echo 0)
            local elapsed=$((now - last_time))
            if (( elapsed >= 500000000 )); then
                # 距上次事件已过 300ms，执行重启
                rm -f "$restart_marker"
                restart_service "$name" "$dir" "$binary" "$port" "$use_db"
            fi
        done
    ) &
    local debounce_pid=$!
    echo "$debounce_pid" >> /tmp/dev_sh_watchers.tmp
}

echo -e "${GREEN}========================================${NC}"
echo -e "${GREEN}  TopFans Backend 热更新开发模式${NC}"
echo -e "${GREEN}========================================${NC}"
echo ""
echo -e "${YELLOW}数据库: ${DB_USER}@${DB_HOST}:${DB_PORT}/${DB_NAME}${NC}"
echo -e "${YELLOW}文件监听器: $WATCHER_TOOL${NC}"
echo ""

# 初始化监听器 PID 列表
> /tmp/dev_sh_watchers.tmp

# 清理残留 PID 文件（上次非正常退出可能留下）
for service in activityService galleryService socialService assetService userService taskService gateway starbookService; do
    rm -f "/tmp/dev_sh_${service}.pid" "/tmp/dev_sh_${service}_restart"
done

# 停止现有服务（清理环境）
echo -e "${YELLOW}🛑 停止现有服务...${NC}"
for service in gateway userService socialService assetService galleryService activityService taskService starbookService; do
    pkill -9 -f "$service" 2>/dev/null || true
done
sleep 1

# 先构建所有服务
echo ""
echo -e "${YELLOW}🔨 预编译所有服务...${NC}"
build_service "gateway"        "gateway"        "gateway/gateway"
build_service "userService"    "services/userService"    "services/userService/userService"
build_service "assetService"   "services/assetService"   "services/assetService/assetService"
build_service "socialService"  "services/socialService"  "services/socialService/socialService"
build_service "galleryService" "services/galleryService" "services/galleryService/galleryService"
build_service "activityService" "services/activityService" "services/activityService/activityService"
build_service "taskService"    "services/taskService"    "services/taskService/taskService"
build_service "starbookService" "services/starbookService" "services/starbookService/starbookService"
cd "$SCRIPT_DIR"

# 启动所有服务
echo ""
echo -e "${YELLOW}🚀 启动所有服务...${NC}"
start_service "userService"    "services/userService/userService"        20000  1
start_service "assetService"   "services/assetService/assetService"      20003  1
start_service "socialService"  "services/socialService/socialService"    20002  1
start_service "galleryService" "services/galleryService/galleryService"   20004  1
start_service "activityService" "services/activityService/activityService" 20005  1
start_service "taskService"    "services/taskService/taskService"    20006  1
start_service "starbookService" "services/starbookService/starbookService" 20007  1
start_service "gateway"        "gateway/gateway"                          8080  0

# 启动所有文件监听器
echo ""
echo -e "${YELLOW}👁️  启动所有文件监听器...${NC}"
start_watcher "gateway"        "gateway"              "gateway/gateway"        8080  0
start_watcher "userService"    "services/userService"    "services/userService/userService"    20000  1
start_watcher "assetService"   "services/assetService"   "services/assetService/assetService"   20003  1
start_watcher "socialService"  "services/socialService"  "services/socialService/socialService" 20002  1
start_watcher "galleryService" "services/galleryService" "services/galleryService/galleryService" 20004  1
start_watcher "activityService" "services/activityService" "services/activityService/activityService" 20005  1
start_watcher "taskService"    "services/taskService"    "services/taskService/taskService"    20006  1
start_watcher "starbookService" "services/starbookService" "services/starbookService/starbookService" 20007  1

echo ""
echo -e "${GREEN}========================================${NC}"
echo -e "${GREEN}  热更新开发模式已启动！${NC}"
echo -e "${GREEN}========================================${NC}"
echo ""
echo -e "${YELLOW}服务地址:${NC}"
echo "  - Gateway:        http://localhost:8080"
echo "  - Swagger UI:     http://localhost:8080/swagger/index.html"
echo "  - User Service:   tri://localhost:20000"
echo "  - Social Service: tri://localhost:20002"
echo "  - Asset Service:  tri://localhost:20003"
echo "  - Gallery Service: tri://localhost:20004"
echo "  - Activity Service: tri://localhost:20005"
echo "  - Task Service:     tri://localhost:20006"
echo "  - Starbook Service: tri://localhost:20007"
echo ""
echo -e "${YELLOW}按 Ctrl+C 停止所有服务${NC}"
echo ""

# 保持脚本运行
wait