// Copyright 2017 gf Author(https://gitee.com/johng/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://gitee.com/johng/gf.
// 并发安全的Session管理器

package ghttp

import (
    "sync"
    "strconv"
    "strings"
    "gitee.com/johng/gf/g/os/gtime"
    "gitee.com/johng/gf/g/util/grand"
    "gitee.com/johng/gf/g/util/gconv"
    "gitee.com/johng/gf/g/container/gmap"
    "time"
)

// 单个session对象
type Session struct {
    mu     sync.RWMutex             // 并发安全互斥锁
    id     string                   // SessionId
    data   *gmap.StringInterfaceMap // Session数据
    server *Server                  // 所属Server
}

// 生成一个唯一的sessionid字符串
func makeSessionId() string {
    return strings.ToUpper(strconv.FormatInt(gtime.Nanosecond(), 32) + grand.RandStr(3))
}

// 获取或者生成一个session对象
func GetSession(r *Request) *Session {
    s   := r.Server
    sid := r.Cookie.SessionId()
    if r := s.sessions.Get(sid); r != nil {
        return r.(*Session)
    }
    ses := &Session {
        id     : sid,
        data   : gmap.NewStringInterfaceMap(),
        server : s,
    }
    s.sessions.Set(sid, ses, s.GetSessionMaxAge())
    return ses
}

// 获取sessionid
func (s *Session) Id() string {
    return s.id
}

// 获取当前session所有数据
func (s *Session) Data () map[string]interface{} {
    return s.data.Clone()
}

// 设置session
func (s *Session) Set (key string, value interface{}) {
    s.data.Set(key, value)
}

// 批量设置(BatchSet别名)
func (s *Session) Sets (m map[string]interface{}) {
    s.BatchSet(m)
}

// 批量设置
func (s *Session) BatchSet (m map[string]interface{}) {
    s.data.BatchSet(m)
}

// 判断键名是否存在
func (s *Session) Contains (key string) bool {
    return s.data.Contains(key)
}

// 获取session
func (s *Session) Get (key string) interface{}  { return s.data.Get(key)          }
func (s *Session) GetString (key string) string { return gconv.String(s.Get(key)) }
func (s *Session) GetBool(key string) bool      { return gconv.Bool(s.Get(key))   }

func (s *Session) GetInt(key string)            int             { return gconv.Int(s.Get(key))   }
func (s *Session) GetInt8(key string)           int8            { return gconv.Int8(s.Get(key))  }
func (s *Session) GetInt16(key string)          int16           { return gconv.Int16(s.Get(key)) }
func (s *Session) GetInt32(key string)          int32           { return gconv.Int32(s.Get(key)) }
func (s *Session) GetInt64(key string)          int64           { return gconv.Int64(s.Get(key)) }

func (s *Session) GetUint(key string)           uint            { return gconv.Uint(s.Get(key))   }
func (s *Session) GetUint8(key string)          uint8           { return gconv.Uint8(s.Get(key))  }
func (s *Session) GetUint16(key string)         uint16          { return gconv.Uint16(s.Get(key)) }
func (s *Session) GetUint32(key string)         uint32          { return gconv.Uint32(s.Get(key)) }
func (s *Session) GetUint64(key string)         uint64          { return gconv.Uint64(s.Get(key)) }

func (s *Session) GetFloat32 (key string) float32 { return gconv.Float32(s.Get(key)) }
func (s *Session) GetFloat64 (key string) float64 { return gconv.Float64(s.Get(key)) }

func (s *Session) GetBytes(key string)          []byte          { return gconv.Bytes(s.Get(key))      }
func (s *Session) GetInts(key string)           []int           { return gconv.Ints(s.Get(key))       }
func (s *Session) GetFloats(key string)         []float64       { return gconv.Floats(s.Get(key))     }
func (s *Session) GetStrings(key string)        []string        { return gconv.Strings(s.Get(key))    }
func (s *Session) GetInterfaces(key string)     []interface{}   { return gconv.Interfaces(s.Get(key)) }

func (s *Session) GetTime(key string, format...string) time.Time       { return gconv.Time(s.Get(key), format...) }
func (s *Session) GetTimeDuration(key string)          time.Duration   { return gconv.TimeDuration(s.Get(key)) }

// 将变量转换为对象，注意 objPointer 参数必须为struct指针
func (s *Session) GetStruct(key string, objPointer interface{}, attrMapping...map[string]string) error {
    return gconv.Struct(s.Get(key), objPointer, attrMapping...)
}

// 删除session
func (s *Session) Remove (key string) {
    s.data.Remove(key)
}

// 清空session
func (s *Session) Clear () {
    s.data.Clear()
}

// 更新过期时间(如果用在守护进程中长期使用，需要手动调用进行更新，防止超时被清除)
func (s *Session) UpdateExpire() {
    s.server.sessions.Set(s.id, s, s.server.GetSessionMaxAge()*1000)
}