package model

import (
	"time"

	"github.com/google/uuid"

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

// Conversation represents a conversation between a contact and agents.
type Conversation struct {
	Base
	UUID                 string         `gorm:"type:uuid;uniqueIndex;not null" json:"uuid"` // auto-generated global unique identifier
	DisplayID            *uint          `gorm:"index" json:"display_id,omitempty"`          // account-level auto-increment number
	AccountID            uint           `gorm:"index;not null" json:"account_id"`
	InboxID              uint           `gorm:"index;not null" json:"inbox_id"`
	ContactID            uint           `gorm:"index;not null" json:"contact_id"`
	ContactInboxID       *uint          `gorm:"index" json:"contact_inbox_id,omitempty"`
	AssigneeID           *uint          `gorm:"index" json:"assignee_id"`
	TeamID               *uint          `gorm:"index" json:"team_id,omitempty"`
	CampaignID           *uint          `gorm:"index" json:"campaign_id,omitempty"`
	SlaPolicyID          *uint          `gorm:"index" json:"sla_policy_id,omitempty"`
	Status               string         `gorm:"size:50;index;default:open" json:"status"` // open, resolved, pending, snoozed
	Priority             string         `gorm:"size:50;default:none" json:"priority"`     // none, low, medium, high, urgent
	ChannelType          string         `gorm:"size:50;not null" json:"channel_type"`
	Channel              string         `gorm:"size:50;not null" json:"channel"`      // channel identifier for routing
	Labels               string         `gorm:"type:text" json:"labels,omitempty"`    // comma-separated or JSON label list
	SnoozedUntil         *int64         `gorm:"index" json:"snoozed_until,omitempty"` // timestamp for snoozed conversations
	AdditionalAttributes datatypes.JSON `gorm:"type:jsonb" json:"additional_attributes,omitempty"`
	CustomAttributes     datatypes.JSON `gorm:"type:jsonb" json:"custom_attributes,omitempty"`
	AgentLastSeenAt      *int64         `json:"agent_last_seen_at,omitempty"`
	AssigneeLastSeenAt   *int64         `json:"assignee_last_seen_at,omitempty"`
	ContactLastSeenAt    *int64         `json:"contact_last_seen_at,omitempty"`
	WaitingSince         *int64         `json:"waiting_since,omitempty"`
	LastActivityAt       *int64         `json:"last_activity_at,omitempty"`
	FirstReplyCreatedAt  *int64         `json:"first_reply_created_at,omitempty"`
	Muted                bool           `gorm:"default:false" json:"muted"`
	ResolvedAt           *time.Time     `json:"resolved_at,omitempty"` // Chatwoot: timestamp when conversation was resolved
	ResumedAt            *time.Time     `json:"resumed_at,omitempty"`  // Chatwoot: timestamp when conversation was reopened
	LastMessageAt        *int64         `gorm:"index" json:"last_message_at,omitempty"`
	LastNonSysMsgAt      *int64         `json:"last_non_system_message_at,omitempty"`

	Contact  *Contact  `gorm:"foreignKey:ContactID" json:"contact,omitempty"`
	Inbox    *Inbox    `gorm:"foreignKey:InboxID" json:"inbox,omitempty"`
	Assignee *User     `gorm:"foreignKey:AssigneeID" json:"assignee,omitempty"`
	Messages []Message `gorm:"foreignKey:ConversationID" json:"messages,omitempty"`
}

// BeforeCreate auto-generates UUID before inserting a new Conversation record.
func (c *Conversation) BeforeCreate(tx *gorm.DB) error {
	if c.UUID == "" {
		c.UUID = uuid.New().String()
	}
	return nil
}

func (Conversation) TableName() string { return "conversations" }