package orderLogic

import (
	"context"
	"encoding/json"
	"fmt"
	"time"

	commonLogic "github.com/perfect-panel/server/internal/logic/common"
	"github.com/perfect-panel/server/internal/model/order"
	"github.com/perfect-panel/server/internal/model/subscribe"
	internaltypes "github.com/perfect-panel/server/internal/types"
	"gorm.io/gorm"
)

func validateNewUserOnlyEligibilityAtActivation(
	ctx context.Context,
	db *gorm.DB,
	orderInfo *order.Order,
	sub *subscribe.Subscribe,
) error {
	if orderInfo == nil || sub == nil || orderInfo.Type != OrderTypeSubscribe || sub.Discount == "" {
		return nil
	}

	var discounts []internaltypes.SubscribeDiscount
	if err := json.Unmarshal([]byte(sub.Discount), &discounts); err != nil {
		return nil
	}
	if !isNewUserOnlyForQuantity(discounts, orderInfo.Quantity) {
		return nil
	}

	eligibility, err := commonLogic.ResolveNewUserEligibility(ctx, db, orderInfo.UserId)
	if err != nil {
		return err
	}
	if !eligibility.IsNewUserAt(time.Now()) {
		return fmt.Errorf("new user only: user %d is not a new user", orderInfo.UserId)
	}

	historyCount, err := commonLogic.CountScopedSubscribePurchaseOrders(
		ctx,
		db,
		eligibility.ScopeUserIDs,
		orderInfo.SubscribeId,
		[]int64{OrderStatusFinished},
		orderInfo.OrderNo,
	)
	if err != nil {
		return fmt.Errorf("new user only: check history error: %w", err)
	}
	if historyCount >= 1 {
		return fmt.Errorf("new user only: user %d already activated subscribe %d", orderInfo.UserId, orderInfo.SubscribeId)
	}

	return nil
}