package entities

import (
	"time"

	"github.com/google/uuid"

	"gorm.io/gorm"
)

// CashAdvance is money handed to a team up front so it can go shopping — kasbon in
// the Indonesian UI. While the cash is out it is still the outlet's, not a cost, so
// nothing about what the team bought lives here: that is read back from the purchase
// orders and expenses charged to the advance.
type CashAdvance struct {
	ID             uuid.UUID `gorm:"type:uuid;primary_key;default:gen_random_uuid()" json:"id"`
	OrganizationID uuid.UUID `gorm:"type:uuid;not null;index" json:"organization_id"`
	OutletID       uuid.UUID `gorm:"type:uuid;not null;index" json:"outlet_id"`
	CodeNumber     string    `gorm:"not null;size:50" json:"code_number"`
	// An advance is always handed to a team, so unlike a purchase order it has no
	// "not chosen yet" state. TeamCategoryID is set only when the scope is category.
	TeamScope      string     `gorm:"not null;size:20;index" json:"team_scope"`
	TeamCategoryID *uuid.UUID `gorm:"type:uuid;index" json:"team_category_id"`
	Amount         float64    `gorm:"type:decimal(15,2);not null;default:0" json:"amount"`
	ReturnedAmount float64    `gorm:"type:decimal(15,2);not null;default:0" json:"returned_amount"`
	IssuedDate     time.Time  `gorm:"type:date;not null" json:"issued_date"`
	DueDate        *time.Time `gorm:"type:date" json:"due_date"`
	Status         string     `gorm:"not null;size:20;default:'draft'" json:"status"`
	Description    *string    `gorm:"type:text" json:"description"`
	CreatedAt      time.Time  `gorm:"autoCreateTime" json:"created_at"`
	UpdatedAt      time.Time  `gorm:"autoUpdateTime" json:"updated_at"`

	// SettledAmount is filled in by the read queries from the spending charged to
	// this advance. It has no column of its own, so it can never drift out of step
	// with the purchases behind it; the arrow tag keeps writes from touching it.
	SettledAmount float64 `gorm:"->;-:migration" json:"settled_amount"`

	Organization *Organization `gorm:"foreignKey:OrganizationID" json:"organization,omitempty"`
	Outlet       *Outlet       `gorm:"foreignKey:OutletID" json:"outlet,omitempty"`
	TeamCategory *Category     `gorm:"foreignKey:TeamCategoryID" json:"team_category,omitempty"`
}

func (k *CashAdvance) BeforeCreate(tx *gorm.DB) error {
	if k.ID == uuid.Nil {
		k.ID = uuid.New()
	}
	return nil
}

func (CashAdvance) TableName() string {
	return "cash_advances"
}

// CashAdvanceSettlement is one piece of spending charged to an advance. It is read
// out of purchase_orders and expenses, so it has no table of its own.
type CashAdvanceSettlement struct {
	Type   string    `json:"type"`
	ID     uuid.UUID `json:"id"`
	Number string    `json:"number"`
	Date   time.Time `json:"date"`
	Amount float64   `json:"amount"`
	Status string    `json:"status"`
}