package model

import (
	"time"

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

// SlaPolicy represents a SLA policy for an account.
// Reference: Chatwoot enterprise/app/models/sla_policy.rb
// Fields: first_response_time_threshold (FRT), next_response_time_threshold (NRT),
// resolution_time_threshold (RT), only_during_business_hours
type SlaPolicy struct {
	ID                         uint           `gorm:"primaryKey;autoIncrement" json:"id"`
	AccountID                  uint           `gorm:"not null;index" json:"account_id"`
	Name                       string         `gorm:"size:255;not null" json:"name"`
	Description                string         `gorm:"type:text" json:"description"`
	FirstResponseTimeThreshold int            `gorm:"default:0" json:"first_response_time_threshold"` // FRT in seconds
	NextResponseTimeThreshold  int            `gorm:"default:0" json:"next_response_time_threshold"`  // NRT in seconds
	ResolutionTimeThreshold    int            `gorm:"default:0" json:"resolution_time_threshold"`     // RT in seconds
	OnlyDuringBusinessHours    bool           `gorm:"default:false" json:"only_during_business_hours"`
	PausedAt                   *time.Time     `gorm:"index" json:"paused_at,omitempty"`
	CreatedAt                  time.Time      `gorm:"autoCreateTime" json:"created_at"`
	UpdatedAt                  time.Time      `gorm:"autoUpdateTime" json:"updated_at"`
	DeletedAt                  gorm.DeletedAt `gorm:"index" json:"deleted_at,omitempty"`

	Account          Account          `gorm:"foreignKey:AccountID" json:"account,omitempty"`
	AppliedSLAs      []AppliedSLA     `gorm:"foreignKey:SlaPolicyID" json:"applied_slas,omitempty"`
	SlaPolicyInboxes []SlaPolicyInbox `gorm:"foreignKey:SlaPolicyID" json:"inboxes,omitempty"`
}

func (SlaPolicy) TableName() string { return "sla_policies" }

// SlaPolicyInbox represents the join between SlaPolicy and Inbox.
// An SLA policy can be associated with specific inboxes.
// Reference: Chatwoot app/models/sla_policy_inbox.rb
type SlaPolicyInbox struct {
	ID          uint           `gorm:"primaryKey;autoIncrement" json:"id"`
	SlaPolicyID uint           `gorm:"not null;index" json:"sla_policy_id"`
	InboxID     uint           `gorm:"not null;uniqueIndex:idx_sla_inbox_unique" json:"inbox_id"`
	AccountID   uint           `gorm:"not null;index" json:"account_id"`
	CreatedAt   time.Time      `gorm:"autoCreateTime" json:"created_at"`
	UpdatedAt   time.Time      `gorm:"autoUpdateTime" json:"updated_at"`
	DeletedAt   gorm.DeletedAt `gorm:"index" json:"deleted_at,omitempty"`

	SlaPolicy SlaPolicy `gorm:"foreignKey:SlaPolicyID" json:"sla_policy,omitempty"`
	Inbox     Inbox     `gorm:"foreignKey:InboxID" json:"inbox,omitempty"`
}

func (SlaPolicyInbox) TableName() string { return "sla_policy_inboxes" }

// AppliedSLA represents a SLA policy applied to a conversation.
// Reference: Chatwoot app/models/applied_sla.rb
// Tracks SLA status, target timestamps (FRT/NRT/RT), and actual completion times.
type AppliedSLA struct {
	ID             uint      `gorm:"primaryKey;autoIncrement" json:"id"`
	SlaPolicyID    uint      `gorm:"not null;index" json:"sla_policy_id"`
	ConversationID uint      `gorm:"not null;index" json:"conversation_id"`
	AccountID      uint      `gorm:"not null;index" json:"account_id"`
	SLAStatus      SLAStatus `gorm:"size:50;not null;default:active" json:"sla_status"`
	// Target timestamps for FRT/NRT/RT (computed from policy + created_at)
	FRTTargetAt *time.Time `gorm:"index" json:"frt_target_at,omitempty"`
	NRTTargetAt *time.Time `gorm:"index" json:"nrt_target_at,omitempty"`
	RTTargetAt  *time.Time `gorm:"index" json:"rt_target_at,omitempty"`
	// Actual timestamps when targets were hit or violated
	FRTActualAt *time.Time     `json:"frt_actual_at,omitempty"`
	NRTActualAt *time.Time     `json:"nrt_actual_at,omitempty"`
	RTActualAt  *time.Time     `json:"rt_actual_at,omitempty"`
	CreatedAt   time.Time      `gorm:"autoCreateTime" json:"created_at"`
	UpdatedAt   time.Time      `gorm:"autoUpdateTime" json:"updated_at"`
	DeletedAt   gorm.DeletedAt `gorm:"index" json:"deleted_at,omitempty"`

	SlaPolicy    SlaPolicy    `gorm:"foreignKey:SlaPolicyID" json:"sla_policy,omitempty"`
	Conversation Conversation `gorm:"foreignKey:ConversationID" json:"conversation,omitempty"`
	SlaEvents    []SlaEvent   `gorm:"foreignKey:AppliedSlaID" json:"sla_events,omitempty"`
}

func (AppliedSLA) TableName() string { return "applied_slas" }

// SlaEvent represents an event related to a SLA applied to a conversation.
// Reference: Chatwoot app/models/sla_event.rb
// Fields: event_type (frt/nrt/rt), meta (jsonb), account_id, conversation_id, inbox_id, sla_policy_id
type SlaEvent struct {
	ID             uint           `gorm:"primaryKey;autoIncrement" json:"id"`
	AppliedSlaID   uint           `gorm:"not null;index" json:"applied_sla_id"`
	AccountID      uint           `gorm:"not null;index" json:"account_id"`
	ConversationID uint           `gorm:"not null;index" json:"conversation_id"`
	InboxID        uint           `gorm:"not null;index" json:"inbox_id"`
	SlaPolicyID    uint           `gorm:"not null;index" json:"sla_policy_id"`
	EventType      SLAEventType   `gorm:"size:50;not null" json:"event_type"`
	Meta           datatypes.JSON `gorm:"type:jsonb" json:"meta,omitempty"` // e.g. {"message_id": 123} for NRT events
	CreatedAt      time.Time      `gorm:"autoCreateTime" json:"created_at"`
	UpdatedAt      time.Time      `gorm:"autoUpdateTime" json:"updated_at"`
	DeletedAt      gorm.DeletedAt `gorm:"index" json:"deleted_at,omitempty"`

	AppliedSLA   AppliedSLA   `gorm:"foreignKey:AppliedSlaID" json:"applied_sla,omitempty"`
	Conversation Conversation `gorm:"foreignKey:ConversationID" json:"conversation,omitempty"`
}

func (SlaEvent) TableName() string { return "sla_events" }