// Copyright 2026 The Forgejo Authors.
// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: GPL-3.0-or-later

package packages

import (
	"context"

	"forgejo.org/models/organization"
	"forgejo.org/models/perm"
	"forgejo.org/models/unit"
	user_model "forgejo.org/models/user"
	"forgejo.org/modules/setting"
	api "forgejo.org/modules/structs"
)

func DeterminePackageAccessMode(ctx context.Context, owner, doer *user_model.User) (perm.AccessMode, error) {
	if setting.Service.RequireSignInView && (doer == nil || doer.IsGhost()) {
		return perm.AccessModeNone, nil
	}

	if doer != nil && !doer.IsGhost() && !doer.IsAccessAllowed(ctx) {
		return perm.AccessModeNone, nil
	}

	// TODO: ActionUser permission check
	accessMode := perm.AccessModeNone
	if owner.IsOrganization() {
		org := organization.OrgFromUser(owner)

		if doer != nil && !doer.IsGhost() {
			// 1. If user is logged in, check all team packages permissions
			var err error
			accessMode, err = org.GetOrgUserMaxAuthorizeLevel(ctx, doer.ID)
			if err != nil {
				return accessMode, err
			}
			// If access mode is less than write check every team for more permissions
			// The minimum possible access mode is read for org members
			if accessMode < perm.AccessModeWrite {
				teams, err := organization.GetUserOrgTeams(ctx, org.ID, doer.ID)
				if err != nil {
					return accessMode, err
				}
				for _, t := range teams {
					perm := t.UnitAccessMode(ctx, unit.TypePackages)
					if accessMode < perm {
						accessMode = perm
					}
				}
			}
		}
		if accessMode == perm.AccessModeNone && organization.HasOrgOrUserVisible(ctx, owner, doer) {
			// 2. If user is unauthorized or no org member, check if org is visible
			accessMode = perm.AccessModeRead
		}
	} else {
		if doer != nil && !doer.IsGhost() {
			// 1. Check if user is package owner
			if doer.ID == owner.ID {
				accessMode = perm.AccessModeOwner
			} else if owner.Visibility == api.VisibleTypePublic || owner.Visibility == api.VisibleTypeLimited { // 2. Check if package owner is public or limited
				accessMode = perm.AccessModeRead
			}
		} else if owner.Visibility == api.VisibleTypePublic { // 3. Check if package owner is public
			accessMode = perm.AccessModeRead
		}
	}

	return accessMode, nil
}