package orders

import (
	"context"
	"database/sql"
	"time"

	"backend/app/requests"
	"backend/database/fields"
	"backend/database/models/qvyun_v2/public/model"
	"backend/database/models/qvyun_v2/public/table"
	"backend/pkg/utils"
	"backend/providers/otel"

	. "github.com/go-jet/jet/v2/postgres"
	log "github.com/sirupsen/logrus"
	"go.opentelemetry.io/otel/attribute"
	semconv "go.opentelemetry.io/otel/semconv/v1.4.0"
)

// @provider:except
type Service struct {
	db  *sql.DB
	log *log.Entry `inject:"false"`
}

func (svc *Service) Prepare() error {
	svc.log = log.WithField("module", "orders.service")
	_ = Int(1)
	return nil
}

// GetUserOrders
func (svc *Service) GetOrders(ctx context.Context, pagination *requests.Pagination, filter *UserOrderFilter) ([]model.Orders, int64, error) {
	_, span := otel.Start(ctx, "users.service.GetUserOrders")
	defer span.End()
	span.SetAttributes(
		attribute.Int64("user.id", filter.UserID),
		attribute.Int64("page.page", pagination.Page),
		attribute.Int64("page.limit", pagination.Limit),
	)

	tbl := table.Orders

	cond := tbl.UserID.EQ(Int64(filter.UserID))
	if filter.Status != nil {
		cond = cond.AND(tbl.Status.EQ(Int16(int16(*filter.Status))))
	}

	if filter.Type != nil {
		cond = cond.AND(tbl.Type.EQ(Int16(int16(*filter.Type))))
	}

	if filter.CreatedAt != nil {
		cond = cond.AND(tbl.CreatedAt.LT_EQ(TimestampT(*filter.CreatedAt)))
	}

	cntStmt := tbl.SELECT(COUNT(tbl.ID).AS("cnt")).WHERE(cond)
	var count struct {
		Cnt int64
	}

	if err := cntStmt.QueryContext(ctx, svc.db, &count); err != nil {
		return nil, 0, err
	}

	stmt := tbl.
		SELECT(tbl.AllColumns).
		WHERE(cond).
		ORDER_BY(tbl.CreatedAt.DESC()).
		LIMIT(pagination.Limit).
		OFFSET(pagination.Offset())
	span.SetAttributes(semconv.DBStatementKey.String(stmt.DebugSql()))

	var orders []model.Orders
	if err := stmt.QueryContext(ctx, svc.db, &orders); err != nil {
		return nil, 0, err
	}
	return orders, count.Cnt, nil
}

// CreateOrder
func (svc *Service) Create(ctx context.Context, user *model.Users, post *model.Posts) (*model.Orders, error) {
	_, span := otel.Start(ctx, "users.service.CreateOrder")
	defer span.End()
	span.SetAttributes(
		attribute.Int64("post.id", post.ID),
	)

	price := post.Price
	if post.Discount != 100 {
		price = post.Price * int64(post.Discount) / 100
	}

	m := model.Orders{
		CreatedAt:          time.Now(),
		UpdatedAt:          time.Now(),
		TenantID:           post.TenantID,
		UserID:             user.ID,
		Type:               fields.OrderTypeConsume,
		Status:             fields.OrderStatusPending,
		OrderSerial:        svc.generateCreateOrderSerial(ctx),
		RemoteOrderSerial:  "",
		RefundSerial:       "",
		RemoteRefundSerial: "",
		Amount:             price,
		Currency:           "CNY",
		Title:              post.Title,
		Description:        new(string),
		Meta: fields.ToJson(fields.OrderMeta{
			ObjectID: post.ID,
			Price:    post.Price,
			Discount: post.Discount,
			Coupons:  nil,
		}),
	}

	tbl := table.Orders
	stmt := tbl.INSERT(tbl.MutableColumns).MODEL(m).RETURNING(tbl.AllColumns)
	span.SetAttributes(semconv.DBStatementKey.String(stmt.DebugSql()))

	var mm model.Orders
	if err := stmt.QueryContext(ctx, svc.db, &mm); err != nil {
		return nil, err
	}
	return &mm, nil
}

// generateCreateOrderSerial
func (svc *Service) generateCreateOrderSerial(ctx context.Context) string {
	return utils.GenerateOrderSerial("O")
}

// generateRefundOrderSerial
func (svc *Service) generateRefundOrderSerial(ctx context.Context) string {
	return utils.GenerateOrderSerial("R")
}

// GetByOrderID
func (svc *Service) GetByOrderID(ctx context.Context, orderID string) (*model.Orders, error) {
	_, span := otel.Start(ctx, "users.service.GetByOrderID")
	defer span.End()
	span.SetAttributes(
		attribute.String("order.id", orderID),
	)

	tbl := table.Orders
	stmt := tbl.SELECT(tbl.AllColumns).WHERE(tbl.OrderSerial.EQ(String(orderID)))
	span.SetAttributes(semconv.DBStatementKey.String(stmt.DebugSql()))

	var order model.Orders
	if err := stmt.QueryContext(ctx, svc.db, &order); err != nil {
		return nil, err
	}
	return &order, nil
}

// GetUserOrderByOrderID
func (svc *Service) GetUserOrderByOrderID(ctx context.Context, orderID string, userID int64) (*model.Orders, error) {
	_, span := otel.Start(ctx, "users.service.GetUserOrderByOrderID")
	defer span.End()
	span.SetAttributes(
		attribute.String("order.id", orderID),
		attribute.Int64("user.id", userID),
	)

	tbl := table.Orders
	stmt := tbl.SELECT(tbl.AllColumns).WHERE(tbl.OrderSerial.EQ(String(orderID)).AND(tbl.UserID.EQ(Int64(userID))))
	span.SetAttributes(semconv.DBStatementKey.String(stmt.DebugSql()))

	var order model.Orders
	if err := stmt.QueryContext(ctx, svc.db, &order); err != nil {
		return nil, err
	}
	return &order, nil
}