package db

import (
	"context"
	"database/sql"
	"encoding/json"
	"errors"
	"fmt"
	"time"

	"github.com/hhhapz/hackathon/models"
)

func (db *DB) DecodeUser(ctx context.Context, buf []byte) (*models.User, error) {
	user := &models.User{
		Completed: false,
		CreatedAt: models.NewTime(time.Now()),
	}
	if err := json.Unmarshal(buf, &user); err != nil {
		return nil, fmt.Errorf("could not decode userinfo json: %v", err)
	}

	if user.ID == "" {
		return nil, errors.New("no id found in userinfo")
	}

	dbUser, err := models.UserByID(ctx, db.DB, user.ID)
	switch err {
	case sql.ErrNoRows:
		err = user.Insert(ctx, db.DB)
		if err != nil {
			return nil, fmt.Errorf("could not create user: %v", err)
		}
		dbUser = user
		fallthrough
	case nil:
		return dbUser, nil

	default:
		return nil, fmt.Errorf("could not check for user %#v: %v", user, err)
	}
}