package common

import (
	"app.yhyue.com/moapp/MessageCenter/rpc/internal/config"
	"fmt"
	"hash/fnv"
	"sync"
)

var UserLocksMap *UserLocks

type UserLocks struct {
	locks []*sync.Mutex
	mutex sync.Mutex
}

func NewUserLocks() *UserLocks {
	locks := make([]*sync.Mutex, config.ConfigJson.ThreadCount)
	for i := range locks {
		locks[i] = &sync.Mutex{}
	}
	return &UserLocks{
		locks: locks,
	}
}

func (ul *UserLocks) GetLock(userID string) *sync.Mutex {
	hash := hashUserID(userID)

	ul.mutex.Lock()
	defer ul.mutex.Unlock()

	index := hash % uint32(len(ul.locks))
	fmt.Println("index", index)
	return ul.locks[index]
}

func hashUserID(userID string) uint32 {
	h := fnv.New32a()
	h.Write([]byte(userID))
	return h.Sum32()
}