// Copyright (C) Stichting Deltares 2024. All rights reserved.
// 
// This file is part of the application DAM - UI.
// 
// DAM - UI is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that 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/>.
// 
// All names, logos, and references to "Deltares" are registered trademarks of
// Stichting Deltares and remain full property of Stichting Deltares at all times.
// All rights reserved.

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Threading;
using Deltares.Standard.IO;
using Deltares.Standard.Language;
using LumenWorks.Framework.IO.Csv;

namespace Deltares.Dam.Data.CsvImporters;

public class CsvImporterAquifersException : Exception
{
    public CsvImporterAquifersException(string message)
        : base(message) {}
}

public class CsvImporterAquifers
{
    public CsvImporterAquifers(string fileName)
    {
        ErrorMessages.Clear();
        ThrowHelper.ThrowIfStringArgumentNullOrEmpty(fileName, StringResourceNames.CsvFileNotValid);
        ThrowHelper.ThrowIfFileNotExist(fileName, StringResourceNames.CsvFileNotFound);

        CultureInfo oldCultureInfo = Thread.CurrentThread.CurrentCulture;
        try
        {
            Thread.CurrentThread.CurrentCulture = CsvReaderUtilities.DetermineCultureForFile(fileName);
            using (var csv = new CsvReader(new StreamReader(fileName), true, ';'))
            {
                string[] headers = CsvImporterHelper.GetFieldHeaders(this, csv);
                if (headers.Length != 2)
                {
                    string csvHeaderError = LocalizationManager.GetTranslatedText(GetType(), "csvHeaderError");
                    throw new CsvImporterAquifersException($"{fileName} : {csvHeaderError}");
                }

                const string fieldStixFilename = "stix_filename";
                int colIndexStixFilename = CsvReaderUtilities.GetHeaderIndexByString(headers, fieldStixFilename);
                CheckColumn(colIndexStixFilename, fileName, fieldStixFilename);

                const string fieldLayerName = "layer_name";
                int colIndexLayerName = CsvReaderUtilities.GetHeaderIndexByString(headers, fieldLayerName);
                CheckColumn(colIndexLayerName, fileName, fieldLayerName);

                var index = 1;
                while (csv.ReadNextRecord())
                {
                    var aquiferRecord = new AquiferRecord();
                    int colIndex = -1; // Keep track of column for error message
                    try
                    {
                        aquiferRecord.AquiferRecordId = index;
                        index++;

                        // Required columns
                        colIndex = colIndexStixFilename;
                        aquiferRecord.StixFileName = csv[colIndexStixFilename];
                        colIndex = colIndexLayerName;
                        aquiferRecord.LayerName = csv[colIndexLayerName];

                        if (string.IsNullOrEmpty(aquiferRecord.StixFileName) || string.IsNullOrEmpty(aquiferRecord.LayerName))
                        {
                            if (string.IsNullOrEmpty(aquiferRecord.StixFileName) && string.IsNullOrEmpty(aquiferRecord.LayerName))
                            {
                                continue; // ignore empty records
                            }

                            string recordError;
                            if (string.IsNullOrEmpty(aquiferRecord.StixFileName))
                            {
                                recordError = string.Format(LocalizationManager.GetTranslatedText(GetType(), "noStixFileNameForAquiferRecordError"), index);
                            }
                            else
                            {
                                recordError = string.Format(LocalizationManager.GetTranslatedText(GetType(), "noLayerNameForAquiferRecordError"), index);
                            }
                            ErrorMessages.Add($"{recordError}");
                        }
                        else
                        {
                            ImportedItems.Add(aquiferRecord);
                        }
                    }
                    catch (Exception e)
                    {
                        string csvAquiferError = string.Format(LocalizationManager.GetTranslatedText(GetType(), "csvAquiferError"), 
                                                               colIndex + 1);
                        ErrorMessages.Add($"Record {index}: {csvAquiferError + e.Message}");
                    }
                }
            }
        }
        finally
        {
            Thread.CurrentThread.CurrentCulture = oldCultureInfo;
        }
    }

    public List<AquiferRecord> ImportedItems { get; } = new();

    public List<string> ErrorMessages { get; set; } = new();

    private void CheckColumn(int index, string fileName, string fieldName)
    {
        if (index < 0)
        {
            string csvHeaderFieldError = LocalizationManager.GetTranslatedText(GetType(), "csvHeaderFieldError");
            throw new CsvImporterAquifersException($"{fileName} : {csvHeaderFieldError}{fieldName}");
        }
    }

    public class AquiferRecord
    {
        public int AquiferRecordId { get; set; }
        public string StixFileName { get; set; }
        public string LayerName { get; set; }
    }
}