package model

import (
	"encoding/json"
	"strings"

	"gorm.io/datatypes"
	"gorm.io/gorm"
)

// Contact represents a customer/end-user across channels.
// Reference: Chatwoot app/models/contact.rb — P2B M4 spec
type Contact struct {
	Base
	AccountID           uint          `gorm:"index;not null" json:"account_id"`
	Name                string        `gorm:"size:255" json:"name"`
	MiddleName          string        `gorm:"size:255;default:''" json:"middle_name,omitempty"`
	LastName            string        `gorm:"size:255;default:''" json:"last_name,omitempty"`
	Email               string        `gorm:"size:255;index" json:"email,omitempty"`
	PhoneNumber         string        `gorm:"size:50;index" json:"phone_number,omitempty"`
	AvatarURL           string        `gorm:"size:512" json:"avatar_url,omitempty"`
	Identifier          string        `gorm:"size:255;index" json:"identifier,omitempty"`
	CountryCode         string        `gorm:"size:10;default:''" json:"country_code,omitempty"`
	Location            string        `gorm:"size:255;default:''" json:"location,omitempty"`
	AdditionalAttributes datatypes.JSON `gorm:"type:jsonb;default:'{}'" json:"additional_attributes,omitempty"`
	CustomAttributes     datatypes.JSON `gorm:"type:jsonb;default:'{}'" json:"custom_attributes,omitempty"`
	Blocked             bool          `gorm:"default:false" json:"blocked"`
	ContactType         string        `gorm:"size:50;default:''" json:"contact_type,omitempty"`
	SourceID            string        `gorm:"size:255" json:"source_id,omitempty"`
	CompanyID           *uint         `json:"company_id,omitempty"`
	LastActivityAt      *int64        `gorm:"index" json:"last_activity_at,omitempty"`
}

func (Contact) TableName() string { return "contacts" }

// BeforeSave syncs location/country_code from additional_attributes and upgrades contact_type.
// Reference: Chatwoot before_save :sync_contact_attributes → Contacts::SyncAttributes
func (c *Contact) BeforeSave(tx *gorm.DB) error {
	c.syncLocationAndCountryCode()
	c.syncContactType()
	return nil
}

// syncLocationAndCountryCode copies city → Location and country → CountryCode from additional_attributes.
// Reference: Chatwoot Contacts::SyncAttributes#update_contact_location_and_country_code
func (c *Contact) syncLocationAndCountryCode() {
	if c.AdditionalAttributes != nil {
	 attrs := make(map[string]interface{})
	 if err := json.Unmarshal(c.AdditionalAttributes, &attrs); err == nil {
		 if city, ok := attrs["city"].(string); ok && city != "" {
			 c.Location = city
		 }
		 if country, ok := attrs["country"].(string); ok && country != "" {
			 c.CountryCode = country
		 }
	 }
	}
}

// syncContactType upgrades visitor → lead if email/phone/social details present.
// Reference: Chatwoot Contacts::SyncAttributes#set_contact_type
func (c *Contact) syncContactType() {
	if c.ContactType != "visitor" {
		return
	}
	if c.Email != "" || c.PhoneNumber != "" {
		c.ContactType = "lead"
		return
	}
	// Check social details in additional_attributes (social_* keys)
	if c.AdditionalAttributes != nil {
	 attrs := make(map[string]interface{})
	 if err := json.Unmarshal(c.AdditionalAttributes, &attrs); err == nil {
		 for key, val := range attrs {
			 if strings.HasPrefix(key, "social_") {
				 if s, ok := val.(string); ok && s != "" {
					 c.ContactType = "lead"
					 return
				 }
			 }
		 }
	 }
	}
}