package model

import (
	"time"

	"gorm.io/gorm"
)

// CallType 通话类型
type CallType string

const (
	CallTypePrivate CallType = "private" // 私聊通话
	CallTypeGroup   CallType = "group"   // 群聊通话
)

// CallStatus 通话状态
type CallStatus string

const (
	CallStatusCalling   CallStatus = "calling"   // 呼叫中
	CallStatusConnected CallStatus = "connected" // 已接通
	CallStatusEnded     CallStatus = "ended"     // 已结束
	CallStatusRejected  CallStatus = "rejected" // 已拒绝
	CallStatusMissed    CallStatus = "missed"    // 未接听
	CallStatusCancelled CallStatus = "cancelled" // 已取消
)

// ParticipantStatus 参与者状态
type ParticipantStatus string

const (
	ParticipantStatusInvited  ParticipantStatus = "invited"  // 已邀请
	ParticipantStatusJoined   ParticipantStatus = "joined"   // 已加入
	ParticipantStatusLeft     ParticipantStatus = "left"     // 已离开
	ParticipantStatusRejected ParticipantStatus = "rejected" // 已拒绝
)

// CallSession 通话会话
type CallSession struct {
	ID             string      `gorm:"primaryKey;size:20" json:"id"`                                          // 雪花算法ID
	ConversationID string      `gorm:"not null;size:20;index" json:"conversation_id"`                         // 会话ID
	GroupID        *string     `gorm:"index" json:"group_id,omitempty"`                                       // 群组ID（群聊时使用）
	CallerID       string      `gorm:"column:caller_id;type:varchar(50);index;not null" json:"caller_id"`     // 发起者ID
	CallType       CallType    `gorm:"type:varchar(20);not null" json:"call_type"`                            // 通话类型
	MediaType      string      `gorm:"type:varchar(20);default:'voice'" json:"media_type"`                    // 媒体类型: voice/video
	Status         CallStatus  `gorm:"type:varchar(20);default:'calling'" json:"status"`                      // 通话状态
	EndedBy        *string     `gorm:"type:varchar(50)" json:"ended_by,omitempty"`                            // 结束通话的用户ID
	StartedAt      *time.Time  `json:"started_at,omitempty"`                                                  // 接通时间
	EndedAt        *time.Time  `json:"ended_at,omitempty"`                                                    // 结束时间
	Duration       int64       `gorm:"default:0" json:"duration"`                                             // 通话时长（秒）
	CreatedAt      time.Time   `json:"created_at" gorm:"autoCreateTime"`
	UpdatedAt      time.Time   `json:"updated_at" gorm:"autoUpdateTime"`
	DeletedAt      gorm.DeletedAt `json:"-" gorm:"index"`

	// 关联
	Participants []CallParticipant `gorm:"foreignKey:CallID" json:"participants,omitempty"`
}

// BeforeCreate 创建前生成雪花算法ID
func (c *CallSession) BeforeCreate(tx *gorm.DB) error {
	return SetSnowflakeStringID(&c.ID)
}

func (CallSession) TableName() string {
	return "call_sessions"
}

// CallParticipant 通话参与者
type CallParticipant struct {
	ID        uint             `gorm:"primaryKey" json:"id"`
	CallID    string           `gorm:"not null;size:20;index" json:"call_id"`                                 // 通话ID
	UserID    string           `gorm:"column:user_id;type:varchar(50);index;not null" json:"user_id"`         // 用户ID
	Status    ParticipantStatus `gorm:"type:varchar(20);default:'invited'" json:"status"`                     // 参与状态
	JoinedAt  *time.Time       `json:"joined_at,omitempty"`                                                   // 加入时间
	LeftAt    *time.Time       `json:"left_at,omitempty"`                                                     // 离开时间
	CreatedAt time.Time        `json:"created_at" gorm:"autoCreateTime"`
	UpdatedAt time.Time        `json:"updated_at" gorm:"autoUpdateTime"`
}

func (CallParticipant) TableName() string {
	return "call_participants"
}

// IsPrivate 是否私聊通话
func (c *CallSession) IsPrivate() bool {
	return c.CallType == CallTypePrivate
}

// IsGroup 是否群聊通话
func (c *CallSession) IsGroup() bool {
	return c.CallType == CallTypeGroup
}

// IsActive 是否活跃通话
func (c *CallSession) IsActive() bool {
	return c.Status == CallStatusCalling || c.Status == CallStatusConnected
}

// CalculateDuration 计算通话时长
func (c *CallSession) CalculateDuration() {
	if c.StartedAt != nil && c.EndedAt != nil {
		c.Duration = int64(c.EndedAt.Sub(*c.StartedAt).Seconds())
	}
}