package events

import (
	"encoding/json"
	"time"

	"tyapi-server/internal/domains/user/entities"

	"github.com/google/uuid"
)

// UserEventType 用户事件类型
type UserEventType string

const (
	UserRegisteredEvent      UserEventType = "user.registered"
	UserLoggedInEvent        UserEventType = "user.logged_in"
	UserPasswordChangedEvent UserEventType = "user.password_changed"
)

// BaseUserEvent 用户事件基础结构
type BaseUserEvent struct {
	ID            string                 `json:"id"`
	Type          string                 `json:"type"`
	Version       string                 `json:"version"`
	Timestamp     time.Time              `json:"timestamp"`
	Source        string                 `json:"source"`
	AggregateID   string                 `json:"aggregate_id"`
	AggregateType string                 `json:"aggregate_type"`
	Metadata      map[string]interface{} `json:"metadata"`
	Payload       interface{}            `json:"payload"`

	// DDD特有字段
	DomainVersion string `json:"domain_version"`
	CausationID   string `json:"causation_id"`
	CorrelationID string `json:"correlation_id"`
}

// 实现 Event 接口
func (e *BaseUserEvent) GetID() string {
	return e.ID
}

func (e *BaseUserEvent) GetType() string {
	return e.Type
}

func (e *BaseUserEvent) GetVersion() string {
	return e.Version
}

func (e *BaseUserEvent) GetTimestamp() time.Time {
	return e.Timestamp
}

func (e *BaseUserEvent) GetPayload() interface{} {
	return e.Payload
}

func (e *BaseUserEvent) GetMetadata() map[string]interface{} {
	return e.Metadata
}

func (e *BaseUserEvent) GetSource() string {
	return e.Source
}

func (e *BaseUserEvent) GetAggregateID() string {
	return e.AggregateID
}

func (e *BaseUserEvent) GetAggregateType() string {
	return e.AggregateType
}

func (e *BaseUserEvent) GetDomainVersion() string {
	return e.DomainVersion
}

func (e *BaseUserEvent) GetCausationID() string {
	return e.CausationID
}

func (e *BaseUserEvent) GetCorrelationID() string {
	return e.CorrelationID
}

func (e *BaseUserEvent) Marshal() ([]byte, error) {
	return json.Marshal(e)
}

func (e *BaseUserEvent) Unmarshal(data []byte) error {
	return json.Unmarshal(data, e)
}

// UserRegistered 用户注册事件
type UserRegistered struct {
	*BaseUserEvent
	User *entities.User `json:"user"`
}

func NewUserRegisteredEvent(user *entities.User, correlationID string) *UserRegistered {
	return &UserRegistered{
		BaseUserEvent: &BaseUserEvent{
			ID:            uuid.New().String(),
			Type:          string(UserRegisteredEvent),
			Version:       "1.0",
			Timestamp:     time.Now(),
			Source:        "user-service",
			AggregateID:   user.ID,
			AggregateType: "User",
			DomainVersion: "1.0",
			CorrelationID: correlationID,
			Metadata: map[string]interface{}{
				"user_id": user.ID,
				"phone":   user.Phone,
			},
		},
		User: user,
	}
}

func (e *UserRegistered) GetPayload() interface{} {
	return e.User
}

// UserLoggedIn 用户登录事件
type UserLoggedIn struct {
	*BaseUserEvent
	UserID    string `json:"user_id"`
	Phone     string `json:"phone"`
	IPAddress string `json:"ip_address"`
	UserAgent string `json:"user_agent"`
}

func NewUserLoggedInEvent(userID, phone, ipAddress, userAgent, correlationID string) *UserLoggedIn {
	return &UserLoggedIn{
		BaseUserEvent: &BaseUserEvent{
			ID:            uuid.New().String(),
			Type:          string(UserLoggedInEvent),
			Version:       "1.0",
			Timestamp:     time.Now(),
			Source:        "user-service",
			AggregateID:   userID,
			AggregateType: "User",
			DomainVersion: "1.0",
			CorrelationID: correlationID,
			Metadata: map[string]interface{}{
				"user_id":    userID,
				"phone":      phone,
				"ip_address": ipAddress,
				"user_agent": userAgent,
			},
		},
		UserID:    userID,
		Phone:     phone,
		IPAddress: ipAddress,
		UserAgent: userAgent,
	}
}

// UserPasswordChanged 用户密码修改事件
type UserPasswordChanged struct {
	*BaseUserEvent
	UserID string `json:"user_id"`
	Phone  string `json:"phone"`
}

func NewUserPasswordChangedEvent(userID, phone, correlationID string) *UserPasswordChanged {
	return &UserPasswordChanged{
		BaseUserEvent: &BaseUserEvent{
			ID:            uuid.New().String(),
			Type:          string(UserPasswordChangedEvent),
			Version:       "1.0",
			Timestamp:     time.Now(),
			Source:        "user-service",
			AggregateID:   userID,
			AggregateType: "User",
			DomainVersion: "1.0",
			CorrelationID: correlationID,
			Metadata: map[string]interface{}{
				"user_id": userID,
				"phone":   phone,
			},
		},
		UserID: userID,
		Phone:  phone,
	}
}