package user

import (
	"context"

	"github.com/perfect-panel/server/internal/model/user"
	"github.com/perfect-panel/server/internal/svc"
	"github.com/perfect-panel/server/internal/types"
	"github.com/perfect-panel/server/pkg/constant"
	"github.com/perfect-panel/server/pkg/logger"
	"github.com/perfect-panel/server/pkg/xerr"
	"github.com/pkg/errors"
)

type GetInviteSalesLogic struct {
	logger.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

func NewGetInviteSalesLogic(ctx context.Context, svcCtx *svc.ServiceContext) *GetInviteSalesLogic {
	return &GetInviteSalesLogic{
		Logger: logger.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

func (l *GetInviteSalesLogic) GetInviteSales(req *types.GetInviteSalesRequest) (resp *types.GetInviteSalesResponse, err error) {
	// 1. Get current user
	u, ok := l.ctx.Value(constant.CtxKeyUser).(*user.User)
	if !ok {
		l.Errorw("[GetInviteSales] user not found in context")
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.InvalidAccess), "Invalid Access")
	}
	userId := u.Id

	// 2. Count total sales
	var totalSales int64
	err = l.svcCtx.DB.WithContext(l.ctx).
		Table("`order` o").
		Joins("JOIN user u ON o.user_id = u.id").
		Where("u.referer_id = ? AND o.status IN (?, ?)", userId, 2, 5).
		Count(&totalSales).Error
	if err != nil {
		l.Errorw("[GetInviteSales] count sales failed",
			logger.Field("error", err.Error()),
			logger.Field("user_id", userId))
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.DatabaseQueryError),
			"count sales failed: %v", err.Error())
	}

	// 3. Pagination
	if req.Page < 1 {
		req.Page = 1
	}
	if req.Size < 1 {
		req.Size = 10
	}
	if req.Size > 100 {
		req.Size = 100
	}
	offset := (req.Page - 1) * req.Size

	// 4. Get sales data
	type OrderWithUser struct {
		Amount    int64 `gorm:"column:amount"`
		CreatedAt int64 `gorm:"column:created_at"`
		UserId    int64 `gorm:"column:user_id"`
	}

	var orderData []OrderWithUser
	err = l.svcCtx.DB.WithContext(l.ctx).
		Table("`order` o").
		Select("o.amount, CAST(UNIX_TIMESTAMP(o.created_at) * 1000 AS SIGNED) as created_at, u.id as user_id").
		Joins("JOIN user u ON o.user_id = u.id").
		Where("u.referer_id = ? AND o.status IN (?, ?)", userId, 2, 5). // status 2: Paid, 5: Finished
		Order("o.created_at DESC").
		Limit(req.Size).
		Offset(offset).
		Scan(&orderData).Error
	if err != nil {
		l.Errorw("[GetInviteSales] query sales failed",
			logger.Field("error", err.Error()),
			logger.Field("user_id", userId))
		return nil, errors.Wrapf(xerr.NewErrCode(xerr.DatabaseQueryError),
			"query sales failed: %v", err.Error())
	}

	// 5. Get user emails
	var list []types.InvitedUserSale
	for _, order := range orderData {
		var email string
		// Try email auth first
		err = l.svcCtx.DB.WithContext(l.ctx).
			Table("user_auth_methods").
			Select("auth_identifier").
			Where("user_id = ? AND auth_type = ?", order.UserId, "email").
			Limit(1).
			Scan(&email).Error

		// Fallback to any auth method
		if err != nil || email == "" {
			err = l.svcCtx.DB.WithContext(l.ctx).
				Table("user_auth_methods").
				Select("auth_identifier").
				Where("user_id = ?", order.UserId).
				Order("created_at ASC").
				Limit(1).
				Scan(&email).Error
		}

		list = append(list, types.InvitedUserSale{
			Amount:    order.Amount,
			CreatedAt: order.CreatedAt,
			UserEmail: email,
			UserId:    order.UserId,
		})
	}

	return &types.GetInviteSalesResponse{
		Total: totalSales,
		List:  list,
	}, nil
}