/*
 * Copyright (c) Atmosphère-NX
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#pragma once
#include <stratosphere.hpp>
#include "sprofile_srv_types.hpp"

namespace ams::sprofile::srv {

    class ProfileImporter {
        private:
            bool m_committed;
            bool m_imported_metadata;
            int m_importing_count;
            util::optional<ProfileMetadata> m_metadata;
            Identifier m_importing_profiles[50];
            util::BitFlagSet<50> m_imported_profiles;
            Identifier m_revision_key;
        public:
            ProfileImporter(const util::optional<ProfileMetadata> &meta) : m_committed(false), m_imported_metadata(false), m_importing_count(0), m_metadata(util::nullopt), m_imported_profiles(), m_revision_key() {
                if (meta.has_value()) {
                    m_metadata = *meta;
                }
            }
        public:
            bool HasProfile(Identifier id0, Identifier id1) {
                /* Require that we have metadata. */
                if (m_metadata.has_value()) {
                    for (auto i = 0u; i < std::min<size_t>(m_metadata->num_entries, util::size(m_metadata->entries)); ++i) {
                        const auto &entry = m_metadata->entries[i];
                        if (entry.identifier_0 == id0 && entry.identifier_1 == id1) {
                            return true;
                        }
                    }
                }

                /* We don't have the desired profile. */
                return false;
            }

            bool CanImportMetadata() {
                /* We can only import metadata if we haven't already imported metadata. */
                return !m_imported_metadata;
            }

            void ImportMetadata(const ProfileMetadata &meta) {
                /* Set that we've imported metadata. */
                m_imported_metadata = true;

                /* Import the service revision key. */
                m_revision_key = meta.revision_key;

                /* Import all profiles. */
                for (auto i = 0u; i < std::min<size_t>(meta.num_entries, util::size(meta.entries)); ++i) {
                    const auto &import_entry = meta.entries[i];
                    if (!this->HasProfile(import_entry.identifier_0, import_entry.identifier_1)) {
                        m_importing_profiles[m_importing_count++] = import_entry.identifier_0;
                    }
                }
            }

            bool CanImportProfile(Identifier profile) {
                /* Require that we imported metadata. */
                if (m_imported_metadata) {
                    /* Find the specified profile. */
                    for (auto i = 0; i < m_importing_count; ++i) {
                        if (m_importing_profiles[i] == profile) {
                            /* Require the profile not already be imported. */
                            return !m_imported_profiles[i];
                        }
                    }
                }

                /* We can't import the desired profile. */
                return false;
            }

            void OnImportProfile(Identifier profile) {
                /* Set the profile as imported. */
                for (auto i = 0; i < m_importing_count; ++i) {
                    if (m_importing_profiles[i] == profile) {
                        m_imported_profiles[i] = true;
                        break;
                    }
                }
            }

            bool CanCommit() {
                /* We can't commit if we've already committed. */
                if (m_committed) {
                    return false;
                }

                /* We need metadata in order to commit. */
                if (!m_imported_metadata) {
                    return false;
                }

                /* We need to have imported everything we intended to import. */
                return m_imported_profiles.PopCount() == m_importing_count;
            }

            int GetImportingCount() const { return m_importing_count; }
            Identifier GetImportingProfile(int i) const { return m_importing_profiles[i]; }

            Identifier GetRevisionKey() const { return m_revision_key; }
    };

}