package lock

import (
	"sync"
)

// WxIdLockManager 管理微信号级别的锁
type WxIdLockManager struct {
	lockMap map[string]*sync.Mutex
	mapMu   sync.Mutex
}

var (
	wxIdLockManager *WxIdLockManager
	once            sync.Once
)

// GetWxIdLockManager 获取单例锁管理器
func GetWxIdLockManager() *WxIdLockManager {
	once.Do(func() {
		wxIdLockManager = &WxIdLockManager{
			lockMap: make(map[string]*sync.Mutex),
		}
	})
	return wxIdLockManager
}

// getLock 获取指定微信号的锁
func (m *WxIdLockManager) getLock(wxid string) *sync.Mutex {
	m.mapMu.Lock()
	defer m.mapMu.Unlock()

	if _, ok := m.lockMap[wxid]; !ok {
		m.lockMap[wxid] = &sync.Mutex{}
	}
	return m.lockMap[wxid]
}

// RunWithLock 只对某个微信号加锁并执行指定函数
func (m *WxIdLockManager) RunWithLock(wxid string, fn func()) {
	lock := m.getLock(wxid)
	lock.Lock()
	defer lock.Unlock()
	fn()
}

var (
	lockMap = make(map[string]*sync.Mutex)
	mapLock = sync.Mutex{}
)

func LockWxId(wxid string) {
	mapLock.Lock()
	mu, ok := lockMap[wxid]
	if !ok {
		mu = &sync.Mutex{}
		lockMap[wxid] = mu
	}
	mapLock.Unlock()

	mu.Lock()
}

// UnlockWxId 解锁指定微信号
func UnlockWxId(wxid string) {
	mapLock.Lock()
	mu, ok := lockMap[wxid]
	mapLock.Unlock()

	if ok {
		mu.Unlock()
	}
}