package dataprovider

import (
	"sync"
)

var cachedPasswords passwordsCache

func init() {
	cachedPasswords = passwordsCache{
		cache: make(map[string]string),
	}
}

type passwordsCache struct {
	sync.RWMutex
	cache map[string]string
}

func (c *passwordsCache) Add(username, password string) {
	if !config.PasswordCaching || username == "" || password == "" {
		return
	}

	c.Lock()
	defer c.Unlock()

	c.cache[username] = password
}

func (c *passwordsCache) Remove(username string) {
	if !config.PasswordCaching {
		return
	}

	c.Lock()
	defer c.Unlock()

	delete(c.cache, username)
}

// Check returns if the user is found and if the password match
func (c *passwordsCache) Check(username, password string) (bool, bool) {
	if username == "" || password == "" {
		return false, false
	}

	c.RLock()
	defer c.RUnlock()

	pwd, ok := c.cache[username]
	if !ok {
		return false, false
	}

	return true, pwd == password
}

// CheckCachedPassword is an utility method used only in test cases
func CheckCachedPassword(username, password string) (bool, bool) {
	return cachedPasswords.Check(username, password)
}