// Copyright 2017-2018 gf Author(https://github.com/gogf/gf). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.

// Package gcache provides kinds of cache management for process.
// It default provides a concurrent-safe in-memory cache adapter for process.
package gcache

import (
	"github.com/gogf/gf/container/gvar"
	"time"
)

// Default cache object.
var defaultCache = New()

// Set sets cache with <key>-<value> pair, which is expired after <duration>.
// It does not expire if <duration> == 0.
func Set(key interface{}, value interface{}, duration time.Duration) {
	defaultCache.Set(key, value, duration)
}

// SetIfNotExist sets cache with <key>-<value> pair if <key> does not exist in the cache,
// which is expired after <duration>. It does not expire if <duration> == 0.
func SetIfNotExist(key interface{}, value interface{}, duration time.Duration) (bool, error) {
	return defaultCache.SetIfNotExist(key, value, duration)
}

// Sets batch sets cache with key-value pairs by <data>, which is expired after <duration>.
//
// It does not expire if <duration> == 0.
func Sets(data map[interface{}]interface{}, duration time.Duration) error {
	return defaultCache.Sets(data, duration)
}

// Get returns the value of <key>.
// It returns nil if it does not exist or its value is nil.
func Get(key interface{}) (interface{}, error) {
	return defaultCache.Get(key)
}

// GetVar retrieves and returns the value of <key> as gvar.Var.
func GetVar(key interface{}) (*gvar.Var, error) {
	return defaultCache.GetVar(key)
}

// GetOrSet returns the value of <key>,
// or sets <key>-<value> pair and returns <value> if <key> does not exist in the cache.
// The key-value pair expires after <duration>.
//
// It does not expire if <duration> == 0.
func GetOrSet(key interface{}, value interface{}, duration time.Duration) (interface{}, error) {
	return defaultCache.GetOrSet(key, value, duration)
}

// GetOrSetFunc returns the value of <key>, or sets <key> with result of function <f>
// and returns its result if <key> does not exist in the cache. The key-value pair expires
// after <duration>. It does not expire if <duration> == 0.
func GetOrSetFunc(key interface{}, f func() (interface{}, error), duration time.Duration) (interface{}, error) {
	return defaultCache.GetOrSetFunc(key, f, duration)
}

// GetOrSetFuncLock returns the value of <key>, or sets <key> with result of function <f>
// and returns its result if <key> does not exist in the cache. The key-value pair expires
// after <duration>. It does not expire if <duration> == 0.
//
// Note that the function <f> is executed within writing mutex lock.
func GetOrSetFuncLock(key interface{}, f func() (interface{}, error), duration time.Duration) (interface{}, error) {
	return defaultCache.GetOrSetFuncLock(key, f, duration)
}

// Contains returns true if <key> exists in the cache, or else returns false.
func Contains(key interface{}) (bool, error) {
	return defaultCache.Contains(key)
}

// Remove deletes the one or more keys from cache, and returns its value.
// If multiple keys are given, it returns the value of the deleted last item.
func Remove(keys ...interface{}) (value interface{}, err error) {
	return defaultCache.Remove(keys...)
}

// Removes deletes <keys> in the cache.
// Deprecated, use Remove instead.
func Removes(keys []interface{}) {
	defaultCache.Removes(keys)
}

// Data returns a copy of all key-value pairs in the cache as map type.
func Data() (map[interface{}]interface{}, error) {
	return defaultCache.Data()
}

// Keys returns all keys in the cache as slice.
func Keys() ([]interface{}, error) {
	return defaultCache.Keys()
}

// KeyStrings returns all keys in the cache as string slice.
func KeyStrings() ([]string, error) {
	return defaultCache.KeyStrings()
}

// Values returns all values in the cache as slice.
func Values() ([]interface{}, error) {
	return defaultCache.Values()
}

// Size returns the size of the cache.
func Size() (int, error) {
	return defaultCache.Size()
}

// GetExpire retrieves and returns the expiration of <key>.
// It returns -1 if the <key> does not exist in the cache.
func GetExpire(key interface{}) (time.Duration, error) {
	return defaultCache.GetExpire(key)
}

// Update updates the value of <key> without changing its expiration and returns the old value.
// The returned <exist> value is false if the <key> does not exist in the cache.
func Update(key interface{}, value interface{}) (oldValue interface{}, exist bool, err error) {
	return defaultCache.Update(key, value)
}

// UpdateExpire updates the expiration of <key> and returns the old expiration duration value.
// It returns -1 if the <key> does not exist in the cache.
func UpdateExpire(key interface{}, duration time.Duration) (oldDuration time.Duration, err error) {
	return defaultCache.UpdateExpire(key, duration)
}