package dto

import (
	"time"

	entity "gitlab.com/mbugroup/lti-api.git/internal/entities"
	userDTO "gitlab.com/mbugroup/lti-api.git/internal/modules/users/dto"
)

// === DTO Structs ===

type ExpenseBaseDTO struct {
	Id   uint   `json:"id"`
	Name string `json:"name"`
}

type ExpenseListDTO struct {
	Id          uint                 `json:"id"`
	Name        string               `json:"name"`
	CreatedUser *userDTO.UserBaseDTO `json:"created_user"`
	CreatedAt   time.Time            `json:"created_at"`
	UpdatedAt   time.Time            `json:"updated_at"`
}

type ExpenseDetailDTO struct {
	ExpenseListDTO
}

// === Mapper Functions ===

func ToExpenseBaseDTO(e entity.Expense) ExpenseBaseDTO {
	return ExpenseBaseDTO{
		Id:    e.Id,
		Name:  e.Name,
	}
}

func ToExpenseListDTO(e entity.Expense) ExpenseListDTO {
	var createdUser *userDTO.UserBaseDTO
	if e.CreatedUser.Id != 0 {
		mapped := userDTO.ToUserBaseDTO(e.CreatedUser)
		createdUser = &mapped
	}

	return ExpenseListDTO{
		Id:          e.Id,
		Name:        e.Name,
		CreatedAt:   e.CreatedAt,
		UpdatedAt:   e.UpdatedAt,
		CreatedUser: createdUser,
	}
}

func ToExpenseListDTOs(e []entity.Expense) []ExpenseListDTO {
	result := make([]ExpenseListDTO, len(e))
	for i, r := range e {
		result[i] = ToExpenseListDTO(r)
	}
	return result
}

func ToExpenseDetailDTO(e entity.Expense) ExpenseDetailDTO {
	return ExpenseDetailDTO{
		ExpenseListDTO: ToExpenseListDTO(e),
	}
}