package biz

import (
	"context"
	"time"

	"gitlab.guxuan.icu/jinshan_community/internal/mods/product/dal"
	"gitlab.guxuan.icu/jinshan_community/internal/mods/product/schema"
	"gitlab.guxuan.icu/jinshan_community/pkg/errors"
	"gitlab.guxuan.icu/jinshan_community/pkg/util"
)

// Defining the `Order` business logic.
type Order struct {
	Trans    *util.Trans
	OrderDAL *dal.Order
}

// Query orders from the data access object based on the provided parameters and options.
func (a *Order) Query(ctx context.Context, params schema.OrderQueryParam) (*schema.OrderQueryResult, error) {
	params.Pagination = true

	result, err := a.OrderDAL.Query(ctx, params, schema.OrderQueryOptions{
		QueryOptions: util.QueryOptions{
			OrderFields: []util.OrderByParam{
				{Field: "created_at", Direction: util.DESC},
			},
		},
	})
	if err != nil {
		return nil, err
	}
	return result, nil
}

// Get the specified order from the data access object.
func (a *Order) Get(ctx context.Context, id string) (*schema.Order, error) {
	order, err := a.OrderDAL.Get(ctx, id)
	if err != nil {
		return nil, err
	} else if order == nil {
		return nil, errors.NotFound("", "Order not found")
	}
	return order, nil
}

// Create a new order in the data access object.
func (a *Order) Create(ctx context.Context, formItem *schema.OrderForm) (*schema.Order, error) {
	order := &schema.Order{}

	if err := formItem.FillTo(order); err != nil {
		return nil, err
	}

	err := a.Trans.Exec(ctx, func(ctx context.Context) error {
		if err := a.OrderDAL.Create(ctx, order); err != nil {
			return err
		}
		return nil
	})
	if err != nil {
		return nil, err
	}
	return order, nil
}

// Update the specified order in the data access object.
func (a *Order) Update(ctx context.Context, id string, formItem *schema.OrderForm) error {
	order, err := a.OrderDAL.Get(ctx, id)
	if err != nil {
		return err
	} else if order == nil {
		return errors.NotFound("", "Order not found")
	}

	if err := formItem.FillTo(order); err != nil {
		return err
	}
	order.UpdatedAt = time.Now()

	return a.Trans.Exec(ctx, func(ctx context.Context) error {
		if err := a.OrderDAL.Update(ctx, order); err != nil {
			return err
		}
		return nil
	})
}

// Delete the specified order from the data access object.
func (a *Order) Delete(ctx context.Context, id string) error {
	exists, err := a.OrderDAL.Exists(ctx, id)
	if err != nil {
		return err
	} else if !exists {
		return errors.NotFound("", "Order not found")
	}

	return a.Trans.Exec(ctx, func(ctx context.Context) error {
		if err := a.OrderDAL.Delete(ctx, id); err != nil {
			return err
		}
		return nil
	})
}