package models

import (
	"database/sql"
	"database/sql/driver"
	"time"
)

// NullableInt32 is a custom type to replace sql.NullInt32 for swagger compatibility
type NullableInt32 struct {
	Int32 int32 `json:"int32,omitempty"`
	Valid bool  `json:"valid"`
}

// Scan implements the sql.Scanner interface for NullableInt32
func (n *NullableInt32) Scan(value interface{}) error {
	var ni sql.NullInt32
	if err := ni.Scan(value); err != nil {
		return err
	}
	n.Int32 = ni.Int32
	n.Valid = ni.Valid
	return nil
}

// Value implements the driver.Valuer interface for NullableInt32
func (n NullableInt32) Value() (driver.Value, error) {
	if !n.Valid {
		return nil, nil
	}
	return n.Int32, nil
}

// Metadata untuk pagination - dioptimalkan
type MetaResponse struct {
	Limit       int  `json:"limit"`
	Offset      int  `json:"offset"`
	Total       int  `json:"total"`
	TotalPages  int  `json:"total_pages"`
	CurrentPage int  `json:"current_page"`
	HasNext     bool `json:"has_next"`
	HasPrev     bool `json:"has_prev"`
}

// Aggregate data untuk summary
type AggregateData struct {
	TotalActive   int            `json:"total_active"`
	TotalDraft    int            `json:"total_draft"`
	TotalInactive int            `json:"total_inactive"`
	ByStatus      map[string]int `json:"by_status"`
	ByDinas       map[string]int `json:"by_dinas,omitempty"`
	ByJenis       map[string]int `json:"by_jenis,omitempty"`
	LastUpdated   *time.Time     `json:"last_updated,omitempty"`
	CreatedToday  int            `json:"created_today"`
	UpdatedToday  int            `json:"updated_today"`
}

// Error response yang konsisten
type ErrorResponse struct {
	Error     string    `json:"error"`
	Code      int       `json:"code"`
	Message   string    `json:"message"`
	Timestamp time.Time `json:"timestamp"`
}

// Validation constants
const (
	StatusDraft    = "draft"
	StatusActive   = "active"
	StatusInactive = "inactive"
	StatusDeleted  = "deleted"
)

// ValidStatuses untuk validasi
var ValidStatuses = []string{StatusDraft, StatusActive, StatusInactive}

// IsValidStatus helper function
func IsValidStatus(status string) bool {
	for _, validStatus := range ValidStatuses {
		if status == validStatus {
			return true
		}
	}
	return false
}