/*
 *
 * (c) Copyright Ascensio System Limited 2010-2020
 *
 * This program is freeware. You can redistribute it and/or modify it under the terms of the GNU 
 * General Public License (GPL) version 3 as published by the Free Software Foundation (https://www.gnu.org/copyleft/gpl.html). 
 * In accordance with Section 7(a) of the GNU GPL its Section 15 shall be amended to the effect that 
 * Ascensio System SIA expressly excludes the warranty of non-infringement of any third-party rights.
 *
 * THIS PROGRAM IS DISTRIBUTED WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY OR
 * FITNESS FOR A PARTICULAR PURPOSE. For more details, see GNU GPL at https://www.gnu.org/copyleft/gpl.html
 *
 * You can contact Ascensio System SIA by email at sales@onlyoffice.com
 *
 * The interactive user interfaces in modified source and object code versions of ONLYOFFICE must display 
 * Appropriate Legal Notices, as required under Section 5 of the GNU GPL version 3.
 *
 * Pursuant to Section 7 § 3(b) of the GNU GPL you must retain the original ONLYOFFICE logo which contains 
 * relevant author attributions when distributing the software. If the display of the logo in its graphic 
 * form is not reasonably feasible for technical reasons, you must include the words "Powered by ONLYOFFICE" 
 * in every copy of the program you distribute. 
 * Pursuant to Section 7 § 3(e) we decline to grant you any rights under trademark law for use of our trademarks.
 *
*/


using System;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;

using ASC.Common.Logging;
using ASC.Data.Backup.Tasks.Data;

using Microsoft.Extensions.Options;

namespace ASC.Data.Backup.Tasks.Modules
{
    public class FilesModuleSpecifics : ModuleSpecificsBase
    {
        private static readonly Regex RegexIsInteger = new Regex(@"^\d+$", RegexOptions.Compiled);
        private const string BunchRightNodeStartProject = "projects/project/";
        private const string BunchRightNodeStartCrmOpportunity = "crm/opportunity/";
        private const string BunchRightNodeStartMy = "files/my/";
        private const string BunchRightNodeStartTrash = "files/trash/";

        private readonly TableInfo[] _tables = new[]
            {
                new TableInfo("files_bunch_objects", "tenant_id"),
                new TableInfo("files_file", "tenant_id", "id", IdType.Integer)
                    {
                        UserIDColumns = new[] {"create_by", "modified_by"},
                        DateColumns = new Dictionary<string, bool> {{"create_on", false}, {"modified_on", false}}
                    },
                new TableInfo("files_folder", "tenant_id", "id")
                    {
                        UserIDColumns = new[] {"create_by", "modified_by"},
                        DateColumns = new Dictionary<string, bool> {{"create_on", false}, {"modified_on", false}}
                    },
                new TableInfo("files_folder_tree"),
                new TableInfo("files_security", "tenant_id") {UserIDColumns = new[] {"owner"}},
                new TableInfo("files_thirdparty_account", "tenant_id", "id")
                    {
                        UserIDColumns = new[] {"user_id"},
                        DateColumns = new Dictionary<string, bool> {{"create_on", false}}
                    },
                new TableInfo("files_thirdparty_id_mapping", "tenant_id")
            };

        private readonly RelationInfo[] _tableRelations = new[]
            {
                new RelationInfo("core_user", "id", "files_bunch_objects", "right_node", typeof(TenantsModuleSpecifics),
                                 x =>
                                     {
                                         var rightNode = Convert.ToString(x["right_node"]);
                                         return rightNode.StartsWith(BunchRightNodeStartMy) || rightNode.StartsWith(BunchRightNodeStartTrash);
                                     }),

                new RelationInfo("core_user", "id", "files_security", "subject", typeof(TenantsModuleSpecifics)),

                new RelationInfo("core_group", "id", "files_security", "subject", typeof(TenantsModuleSpecifics)),

                new RelationInfo("crm_deal", "id", "files_bunch_objects", "right_node", typeof(CrmModuleSpecifics),
                                 x => Convert.ToString(x["right_node"]).StartsWith(BunchRightNodeStartCrmOpportunity)),

                new RelationInfo("projects_projects", "id", "files_bunch_objects", "right_node", typeof(ProjectsModuleSpecifics),
                                 x => Convert.ToString(x["right_node"]).StartsWith(BunchRightNodeStartProject, StringComparison.InvariantCultureIgnoreCase)),

                new RelationInfo("files_folder", "id", "files_bunch_objects", "left_node"),

                new RelationInfo("files_folder", "id", "files_file", "folder_id"),

                new RelationInfo("files_folder", "id", "files_folder", "parent_id"),

                new RelationInfo("files_folder", "id", "files_folder_tree", "folder_id"),

                new RelationInfo("files_folder", "id", "files_folder_tree", "parent_id"),

                new RelationInfo("files_file", "id", "files_security", "entry_id",
                                 x => Convert.ToInt32(x["entry_type"]) == 2 && RegexIsInteger.IsMatch(Convert.ToString(x["entry_id"]))),

                new RelationInfo("files_folder", "id", "files_security", "entry_id",
                                 x => Convert.ToInt32(x["entry_type"]) == 1 && RegexIsInteger.IsMatch(Convert.ToString(x["entry_id"]))),

                new RelationInfo("files_thirdparty_id_mapping", "hash_id", "files_security", "entry_id",
                                 x => !RegexIsInteger.IsMatch(Convert.ToString(x["entry_id"]))),

                new RelationInfo("files_thirdparty_account", "id", "files_thirdparty_id_mapping", "id"),

                new RelationInfo("files_thirdparty_account", "id", "files_thirdparty_id_mapping", "hash_id")
            };

        private readonly Helpers helpers;
        private readonly ILog log;
        public FilesModuleSpecifics(IOptionsMonitor<ILog> options, Helpers helpers) : base(helpers)
        {
            log = options.CurrentValue;
            this.helpers = helpers;
        }

        public override ModuleName ModuleName
        {
            get { return ModuleName.Files; }
        }

        public override IEnumerable<TableInfo> Tables
        {
            get { return _tables; }
        }

        public override IEnumerable<RelationInfo> TableRelations
        {
            get { return _tableRelations; }
        }

        public override bool TryAdjustFilePath(bool dump, ColumnMapper columnMapper, ref string filePath)
        {
            var match = Regex.Match(filePath.Replace('\\', '/'), @"^folder_\d+/file_(?'fileId'\d+)/(?'versionExtension'v\d+/[\.\w]+)$", RegexOptions.Compiled);
            if (match.Success)
            {
                var fileId = columnMapper.GetMapping("files_file", "id", match.Groups["fileId"].Value);
                if (fileId == null)
                {
                    if (!dump)
                    {
                        return false;
                    }

                    fileId = match.Groups["fileId"].Value;
                }

                filePath = string.Format("folder_{0}/file_{1}/{2}", (Convert.ToInt32(fileId) / 1000 + 1) * 1000, fileId, match.Groups["versionExtension"].Value);
                return true;
            }

            return false;
        }

        protected override string GetSelectCommandConditionText(int tenantId, TableInfo table)
        {
            if (table.Name == "files_folder_tree")
            {
                return "inner join files_folder as t1 on t1.id = t.folder_id where t1.tenant_id = " + tenantId;
            }
            if (table.Name == "files_file")
            {
                // do not backup previus backup files
                return "where not exists(select 1 from backup_backup b where b.tenant_id = t.tenant_id and b.storage_path = t.id) and t.tenant_id = " + tenantId;
            }
            return base.GetSelectCommandConditionText(tenantId, table);
        }

        protected override bool TryPrepareRow(bool dump, DbConnection connection, ColumnMapper columnMapper, TableInfo table, DataRowInfo row, out Dictionary<string, object> preparedRow)
        {
            if (row.TableName == "files_thirdparty_id_mapping")
            {
                //todo: think...
                preparedRow = new Dictionary<string, object>();

                object folderId = null;

                var sboxId = Regex.Replace(row[1].ToString(), @"(?<=(?:sbox-|box-|dropbox-|spoint-|drive-|onedrive-))\d+", match =>
                {
                    folderId = columnMapper.GetMapping("files_thirdparty_account", "id", match.Value);
                    return Convert.ToString(folderId);
                }, RegexOptions.Compiled);

                if (folderId == null)
                    return false;

                var hashBytes = MD5.Create().ComputeHash(Encoding.UTF8.GetBytes(sboxId));
                var hashedId = BitConverter.ToString(hashBytes).Replace("-", "").ToLower();

                preparedRow.Add("hash_id", hashedId);
                preparedRow.Add("id", sboxId);
                preparedRow.Add("tenant_id", columnMapper.GetTenantMapping());

                columnMapper.SetMapping("files_thirdparty_id_mapping", "hash_id", row["hash_id"], hashedId);

                return true;
            }

            return base.TryPrepareRow(dump, connection, columnMapper, table, row, out preparedRow);
        }

        protected override bool TryPrepareValue(bool dump, DbConnection connection, ColumnMapper columnMapper, TableInfo table, string columnName, IEnumerable<RelationInfo> relations, ref object value)
        {
            var relationList = relations.ToList();
            if (relationList.All(x => x.ChildTable == "files_security" && x.ChildColumn == "subject"))
            {
                //note: value could be ShareForEveryoneID and in that case result should be always false
                var strVal = Convert.ToString(value);
                if (helpers.IsEmptyOrSystemUser(strVal) || helpers.IsEmptyOrSystemGroup(strVal))
                    return true;

                foreach (var relation in relationList)
                {
                    var mapping = columnMapper.GetMapping(relation.ParentTable, relation.ParentColumn, value);
                    if (mapping != null)
                    {
                        value = mapping;
                        return true;
                    }
                }
                return false;
            }

            return base.TryPrepareValue(dump, connection, columnMapper, table, columnName, relationList, ref value);
        }

        protected override bool TryPrepareValue(DbConnection connection, ColumnMapper columnMapper, RelationInfo relation, ref object value)
        {
            if (relation.ChildTable == "files_bunch_objects" && relation.ChildColumn == "right_node")
            {
                var strValue = Convert.ToString(value);

                var start = GetStart(strValue);
                if (start == null)
                    return false;

                var entityId = columnMapper.GetMapping(relation.ParentTable, relation.ParentColumn, strValue.Substring(start.Length));
                if (entityId == null)
                    return false;

                value = strValue.Substring(0, start.Length) + entityId;
                return true;
            }

            return base.TryPrepareValue(connection, columnMapper, relation, ref value);
        }

        protected override bool TryPrepareValue(DbConnection connection, ColumnMapper columnMapper, TableInfo table, string columnName, ref object value)
        {
            if (table.Name == "files_thirdparty_account" && (columnName == "password" || columnName == "token") && value != null)
            {
                try
                {
                    value = helpers.CreateHash(value as string); // save original hash
                }
                catch (Exception err)
                {
                    log.ErrorFormat("Can not prepare value {0}: {1}", value, err);
                    value = null;
                }
                return true;
            }
            if (table.Name == "files_folder" && (columnName == "create_by" || columnName == "modified_by"))
            {
                base.TryPrepareValue(connection, columnMapper, table, columnName, ref value);
                return true;
            }

            return base.TryPrepareValue(connection, columnMapper, table, columnName, ref value);
        }

        public override void PrepareData(DataTable data)
        {
            if (data.TableName == "files_thirdparty_account")
            {
                var providerColumn = data.Columns.Cast<DataColumn>().Single(c => c.ColumnName == "provider");
                var pwdColumn = data.Columns.Cast<DataColumn>().Single(c => c.ColumnName == "password");
                var tokenColumn = data.Columns.Cast<DataColumn>().Single(c => c.ColumnName == "token");
                for (var i = 0; i < data.Rows.Count; i++)
                {
                    var row = data.Rows[i];
                    try
                    {
                        row[pwdColumn] = helpers.CreateHash2(row[pwdColumn] as string);
                        row[tokenColumn] = helpers.CreateHash2(row[tokenColumn] as string);
                    }
                    catch (Exception ex)
                    {
                        log.ErrorFormat("Can not prepare data {0}: {1}", row[providerColumn] as string, ex);
                        data.Rows.Remove(row);
                        i--;
                    }
                }
            }
        }

        private static string GetStart(string value)
        {
            var allStarts = new[] { BunchRightNodeStartProject, BunchRightNodeStartMy, BunchRightNodeStartTrash, BunchRightNodeStartCrmOpportunity };
            return allStarts.FirstOrDefault(value.StartsWith);
        }
    }



    public class FilesModuleSpecifics2 : ModuleSpecificsBase
    {
        public FilesModuleSpecifics2(Helpers helpers)
        : base(helpers)
        {

        }
        private static readonly Regex RegexIsInteger = new Regex(@"^\d+$", RegexOptions.Compiled);
        private const string TagStartMessage = "Message";
        private const string TagStartTask = "Task";
        private const string TagStartProject = "Project";
        private const string TagStartRelationshipEvent = "RelationshipEvent_";

        private readonly TableInfo[] tables = new[]
            {
                new TableInfo("files_tag", "tenant_id", "id") {UserIDColumns = new[] {"owner"}},
                new TableInfo("files_tag_link", "tenant_id")
                    {
                        UserIDColumns = new[] {"create_by"},
                        DateColumns = new Dictionary<string, bool> {{"create_on", false}}
                    },
            };

        private readonly RelationInfo[] rels = new[]
            {
                new RelationInfo("projects_messages", "id", "files_tag", "name", typeof(ProjectsModuleSpecifics),
                    x => Convert.ToString(x["name"]).StartsWith(TagStartMessage, StringComparison.InvariantCultureIgnoreCase)),

                new RelationInfo("projects_tasks", "id", "files_tag", "name", typeof(ProjectsModuleSpecifics),
                    x => Convert.ToString(x["name"]).StartsWith(TagStartTask, StringComparison.InvariantCultureIgnoreCase)),

                new RelationInfo("projects_projects", "id", "files_tag", "name", typeof(ProjectsModuleSpecifics),
                    x => Convert.ToString(x["name"]).StartsWith(TagStartProject, StringComparison.InvariantCultureIgnoreCase)),

                new RelationInfo("crm_relationship_event", "id", "files_tag", "name", typeof(CrmModuleSpecifics2),
                    x => Convert.ToString(x["name"]).StartsWith(TagStartRelationshipEvent, StringComparison.InvariantCultureIgnoreCase)),

                new RelationInfo("files_tag", "id", "files_tag_link", "tag_id", typeof(FilesModuleSpecifics)),

                new RelationInfo("files_file", "id", "files_tag_link", "entry_id", typeof(FilesModuleSpecifics),
                    x => Convert.ToInt32(x["entry_type"]) == 2 && RegexIsInteger.IsMatch(Convert.ToString(x["entry_id"]))),

                new RelationInfo("files_folder", "id", "files_tag_link", "entry_id",typeof(FilesModuleSpecifics),
                    x => Convert.ToInt32(x["entry_type"]) == 1 && RegexIsInteger.IsMatch(Convert.ToString(x["entry_id"]))),

                new RelationInfo("files_thirdparty_id_mapping", "hash_id", "files_tag_link", "entry_id", typeof(FilesModuleSpecifics),
                    x => !RegexIsInteger.IsMatch(Convert.ToString(x["entry_id"]))),
            };

        public override ModuleName ModuleName
        {
            get { return ModuleName.Files2; }
        }

        public override IEnumerable<TableInfo> Tables
        {
            get { return tables; }
        }

        public override IEnumerable<RelationInfo> TableRelations
        {
            get { return rels; }
        }

        protected override bool TryPrepareValue(DbConnection connection, ColumnMapper columnMapper, RelationInfo relation, ref object value)
        {
            if (relation.ChildTable == "files_tag" && relation.ChildColumn == "name")
            {
                var str = Convert.ToString(value);
                var start = GetStart(str);
                if (start == null)
                {
                    return false;
                }
                var entityId = columnMapper.GetMapping(relation.ParentTable, relation.ParentColumn, str.Substring(start.Length));
                if (entityId == null)
                {
                    return false;
                }
                value = str.Substring(0, start.Length) + entityId;
                return true;
            }
            return base.TryPrepareValue(connection, columnMapper, relation, ref value);
        }

        private static string GetStart(string value)
        {
            var allStarts = new[] { TagStartMessage, TagStartTask, TagStartRelationshipEvent, TagStartProject, };
            return allStarts.FirstOrDefault(value.StartsWith);
        }
    }
}