// Copyright 2025 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package user

import (
	"context"

	"gitea.dev/models/db"
)

func GetUsersMapByIDs(ctx context.Context, userIDs []int64) (map[int64]*User, error) {
	userMaps := make(map[int64]*User, len(userIDs))
	if len(userIDs) == 0 {
		return userMaps, nil
	}

	err := db.QueryAndProcessByChunk(userIDs, func(chunk []int64) (out []*User, err error) {
		err = db.GetEngine(ctx).In("id", chunk).Find(&out)
		return out, err
	}, func(user *User) error {
		userMaps[user.ID] = user
		return nil
	})
	if err != nil {
		return nil, err
	}
	return userMaps, nil
}

func GetPossibleUserFromMap(userID int64, usererMaps map[int64]*User) *User {
	if userID == 0 {
		return nil
	}
	if newFunc, ok := globalVars().systemUserNewFuncs[userID]; ok {
		return newFunc()
	}
	user, ok := usererMaps[userID]
	if !ok {
		return NewGhostUser()
	}
	return user
}