package models

import (
	"database/sql"
	"encoding/json"
	"time"
)

// Retribusi represents the data structure for the retribusi table
// with proper null handling and optimized JSON marshaling
type Retribusi struct {
    ID             string         `json:"id" db:"id"`
    Status         string         `json:"status" db:"status"`
    Sort           sql.NullInt32  `json:"sort,omitempty" db:"sort"`
    UserCreated    sql.NullString `json:"user_created,omitempty" db:"user_created"`
    DateCreated    sql.NullTime   `json:"date_created,omitempty" db:"date_created"`
    UserUpdated    sql.NullString `json:"user_updated,omitempty" db:"user_updated"`
    DateUpdated    sql.NullTime   `json:"date_updated,omitempty" db:"date_updated"`
    Jenis          sql.NullString `json:"jenis,omitempty" db:"Jenis"`
    Pelayanan      sql.NullString `json:"pelayanan,omitempty" db:"Pelayanan"`
    Dinas          sql.NullString `json:"dinas,omitempty" db:"Dinas"`
    KelompokObyek  sql.NullString `json:"kelompok_obyek,omitempty" db:"Kelompok_obyek"`
    KodeTarif      sql.NullString `json:"kode_tarif,omitempty" db:"Kode_tarif"`
    Tarif          sql.NullString `json:"tarif,omitempty" db:"Tarif"`
    Satuan         sql.NullString `json:"satuan,omitempty" db:"Satuan"`
    TarifOvertime  sql.NullString `json:"tarif_overtime,omitempty" db:"Tarif_overtime"`
    SatuanOvertime sql.NullString `json:"satuan_overtime,omitempty" db:"Satuan_overtime"`
    RekeningPokok  sql.NullString `json:"rekening_pokok,omitempty" db:"Rekening_pokok"`
    RekeningDenda  sql.NullString `json:"rekening_denda,omitempty" db:"Rekening_denda"`
    Uraian1        sql.NullString `json:"uraian_1,omitempty" db:"Uraian_1"`
    Uraian2        sql.NullString `json:"uraian_2,omitempty" db:"Uraian_2"`
    Uraian3        sql.NullString `json:"uraian_3,omitempty" db:"Uraian_3"`
}

// Custom JSON marshaling untuk Retribusi agar NULL values tidak muncul di response
func (r Retribusi) MarshalJSON() ([]byte, error) {
    type Alias Retribusi
    aux := &struct {
        Sort           *int       `json:"sort,omitempty"`
        UserCreated    *string    `json:"user_created,omitempty"`
        DateCreated    *time.Time `json:"date_created,omitempty"`
        UserUpdated    *string    `json:"user_updated,omitempty"`
        DateUpdated    *time.Time `json:"date_updated,omitempty"`
        Jenis          *string    `json:"jenis,omitempty"`
        Pelayanan      *string    `json:"pelayanan,omitempty"`
        Dinas          *string    `json:"dinas,omitempty"`
        KelompokObyek  *string    `json:"kelompok_obyek,omitempty"`
        KodeTarif      *string    `json:"kode_tarif,omitempty"`
        Tarif          *string    `json:"tarif,omitempty"`
        Satuan         *string    `json:"satuan,omitempty"`
        TarifOvertime  *string    `json:"tarif_overtime,omitempty"`
        SatuanOvertime *string    `json:"satuan_overtime,omitempty"`
        RekeningPokok  *string    `json:"rekening_pokok,omitempty"`
        RekeningDenda  *string    `json:"rekening_denda,omitempty"`
        Uraian1        *string    `json:"uraian_1,omitempty"`
        Uraian2        *string    `json:"uraian_2,omitempty"`
        Uraian3        *string    `json:"uraian_3,omitempty"`
        *Alias
    }{
        Alias: (*Alias)(&r),
    }

    // Convert sql.Null* to pointers
    if r.Sort.Valid {
        sort := int(r.Sort.Int32)
        aux.Sort = &sort
    }
    if r.UserCreated.Valid {
        aux.UserCreated = &r.UserCreated.String
    }
    if r.DateCreated.Valid {
        aux.DateCreated = &r.DateCreated.Time
    }
    if r.UserUpdated.Valid {
        aux.UserUpdated = &r.UserUpdated.String
    }
    if r.DateUpdated.Valid {
        aux.DateUpdated = &r.DateUpdated.Time
    }
    if r.Jenis.Valid {
        aux.Jenis = &r.Jenis.String
    }
    if r.Pelayanan.Valid {
        aux.Pelayanan = &r.Pelayanan.String
    }
    if r.Dinas.Valid {
        aux.Dinas = &r.Dinas.String
    }
    if r.KelompokObyek.Valid {
        aux.KelompokObyek = &r.KelompokObyek.String
    }
    if r.KodeTarif.Valid {
        aux.KodeTarif = &r.KodeTarif.String
    }
    if r.Tarif.Valid {
        aux.Tarif = &r.Tarif.String
    }
    if r.Satuan.Valid {
        aux.Satuan = &r.Satuan.String
    }
    if r.TarifOvertime.Valid {
        aux.TarifOvertime = &r.TarifOvertime.String
    }
    if r.SatuanOvertime.Valid {
        aux.SatuanOvertime = &r.SatuanOvertime.String
    }
    if r.RekeningPokok.Valid {
        aux.RekeningPokok = &r.RekeningPokok.String
    }
    if r.RekeningDenda.Valid {
        aux.RekeningDenda = &r.RekeningDenda.String
    }
    if r.Uraian1.Valid {
        aux.Uraian1 = &r.Uraian1.String
    }
    if r.Uraian2.Valid {
        aux.Uraian2 = &r.Uraian2.String
    }
    if r.Uraian3.Valid {
        aux.Uraian3 = &r.Uraian3.String
    }

    return json.Marshal(aux)
}

// Helper methods untuk mendapatkan nilai yang aman
func (r *Retribusi) GetJenis() string {
    if r.Jenis.Valid {
        return r.Jenis.String
    }
    return ""
}

func (r *Retribusi) GetDinas() string {
    if r.Dinas.Valid {
        return r.Dinas.String
    }
    return ""
}

func (r *Retribusi) GetTarif() string {
    if r.Tarif.Valid {
        return r.Tarif.String
    }
    return ""
}

// Response struct untuk GET by ID - diperbaiki struktur
type RetribusiGetByIDResponse struct {
    Message string     `json:"message"`
    Data    *Retribusi `json:"data"`
}

// Request struct untuk create - dioptimalkan dengan validasi
type RetribusiCreateRequest struct {
    Status         string  `json:"status" validate:"required,oneof=draft active inactive"`
    Jenis          *string `json:"jenis,omitempty" validate:"omitempty,min=1,max=255"`
    Pelayanan      *string `json:"pelayanan,omitempty" validate:"omitempty,min=1,max=255"`
    Dinas          *string `json:"dinas,omitempty" validate:"omitempty,min=1,max=255"`
    KelompokObyek  *string `json:"kelompok_obyek,omitempty" validate:"omitempty,min=1,max=255"`
    KodeTarif      *string `json:"kode_tarif,omitempty" validate:"omitempty,min=1,max=255"`
    Uraian1        *string `json:"uraian_1,omitempty"`
    Uraian2        *string `json:"uraian_2,omitempty"`
    Uraian3        *string `json:"uraian_3,omitempty"`
    Tarif          *string `json:"tarif,omitempty" validate:"omitempty,numeric"`
    Satuan         *string `json:"satuan,omitempty" validate:"omitempty,min=1,max=255"`
    TarifOvertime  *string `json:"tarif_overtime,omitempty" validate:"omitempty,numeric"`
    SatuanOvertime *string `json:"satuan_overtime,omitempty" validate:"omitempty,min=1,max=255"`
    RekeningPokok  *string `json:"rekening_pokok,omitempty" validate:"omitempty,min=1,max=255"`
    RekeningDenda  *string `json:"rekening_denda,omitempty" validate:"omitempty,min=1,max=255"`
}

// Response struct untuk create
type RetribusiCreateResponse struct {
    Message string     `json:"message"`
    Data    *Retribusi `json:"data"`
}

// Update request - sama seperti create tapi dengan ID
type RetribusiUpdateRequest struct {
    ID             string  `json:"-" validate:"required,uuid4"` // ID dari URL path
    Status         string  `json:"status" validate:"required,oneof=draft active inactive"`
    Jenis          *string `json:"jenis,omitempty" validate:"omitempty,min=1,max=255"`
    Pelayanan      *string `json:"pelayanan,omitempty" validate:"omitempty,min=1,max=255"`
    Dinas          *string `json:"dinas,omitempty" validate:"omitempty,min=1,max=255"`
    KelompokObyek  *string `json:"kelompok_obyek,omitempty" validate:"omitempty,min=1,max=255"`
    KodeTarif      *string `json:"kode_tarif,omitempty" validate:"omitempty,min=1,max=255"`
    Uraian1        *string `json:"uraian_1,omitempty"`
    Uraian2        *string `json:"uraian_2,omitempty"`
    Uraian3        *string `json:"uraian_3,omitempty"`
    Tarif          *string `json:"tarif,omitempty" validate:"omitempty,numeric"`
    Satuan         *string `json:"satuan,omitempty" validate:"omitempty,min=1,max=255"`
    TarifOvertime  *string `json:"tarif_overtime,omitempty" validate:"omitempty,numeric"`
    SatuanOvertime *string `json:"satuan_overtime,omitempty" validate:"omitempty,min=1,max=255"`
    RekeningPokok  *string `json:"rekening_pokok,omitempty" validate:"omitempty,min=1,max=255"`
    RekeningDenda  *string `json:"rekening_denda,omitempty" validate:"omitempty,min=1,max=255"`
}

// Response struct untuk update
type RetribusiUpdateResponse struct {
    Message string     `json:"message"`
    Data    *Retribusi `json:"data"`
}

// Response struct untuk delete
type RetribusiDeleteResponse struct {
    Message string `json:"message"`
    ID      string `json:"id"`
}

// Enhanced GET response dengan pagination dan aggregation
type RetribusiGetResponse struct {
    Message string        `json:"message"`
    Data    []Retribusi   `json:"data"`
    Meta    MetaResponse  `json:"meta"`
    Summary *AggregateData `json:"summary,omitempty"`
}

// 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"`
}

// Filter struct untuk query parameters
type RetribusiFilter struct {
    Status        *string    `json:"status,omitempty" form:"status"`
    Jenis         *string    `json:"jenis,omitempty" form:"jenis"`
    Dinas         *string    `json:"dinas,omitempty" form:"dinas"`
    KelompokObyek *string    `json:"kelompok_obyek,omitempty" form:"kelompok_obyek"`
    Search        *string    `json:"search,omitempty" form:"search"`
    DateFrom      *time.Time `json:"date_from,omitempty" form:"date_from"`
    DateTo        *time.Time `json:"date_to,omitempty" form:"date_to"`
}

// 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
}