using System.Globalization;
using Google.Apis.Sheets.v4;
using Microsoft.Extensions.Logging;
using DiunaBI.Core.Models;
using DiunaBI.Database.Context;

namespace DiunaBI.Plugins.Morska.Importers;

public class MorskaD1Importer : MorskaBaseImporter
{
    public override string ImporterType => "MorskaD1";

    private readonly AppDbContext _db;
    private readonly SpreadsheetsResource.ValuesResource _googleSheetValues;
    private readonly ILogger<MorskaD1Importer> _logger;

    public MorskaD1Importer(
        AppDbContext db,
        SpreadsheetsResource.ValuesResource googleSheetValues,
        ILogger<MorskaD1Importer> logger)
    {
        _db = db;
        _googleSheetValues = googleSheetValues;
        _logger = logger;
    }

    public override void Import(Layer importWorker)
    {
        _logger.LogInformation("MorskaD1: Starting import for {ImportWorkerName} ({ImportWorkerId})", 
            importWorker.Name, importWorker.Id);

        var sheetId = importWorker.Records!.FirstOrDefault(x => x.Code == "SheetId")?.Desc1;
        if (sheetId == null)
        {
            throw new Exception($"SheetId not found, {importWorker.Name}");
        }

        var sheetTabName = importWorker.Records!.FirstOrDefault(x => x.Code == "SheetTabName")?.Desc1;
        if (sheetTabName == null)
        {
            throw new Exception($"SheetTabName not found, {importWorker.Name}");
        }

        var year = importWorker.Records!.FirstOrDefault(x => x.Code == "ImportYear")?.Desc1;
        if (year == null)
        {
            throw new Exception($"ImportYear not found, {importWorker.Name}");
        }

        var month = importWorker.Records!.FirstOrDefault(x => x.Code == "ImportMonth")?.Desc1;
        if (month == null)
        {
            throw new Exception($"ImportMonth not found, {importWorker.Name}");
        }

        var name = importWorker.Records!.FirstOrDefault(x => x.Code == "ImportName")?.Desc1;
        if (name == null)
        {
            throw new Exception($"ImportName not found, {importWorker.Name}");
        }

        var dataRange = importWorker.Records!.FirstOrDefault(x => x.Code == "DataRange")?.Desc1;
        if (dataRange == null)
        {
            throw new Exception($"DataRange not found, {importWorker.Name}");
        }

        _logger.LogDebug("MorskaD1: Importing from sheet {SheetId}, tab {SheetTabName}, range {DataRange}", 
            sheetId, sheetTabName, dataRange);

        var layer = new Layer
        {
            Id = Guid.NewGuid(), 
            Number = _db.Layers.Count() + 1,
            ParentId = importWorker.Id,
            Type = LayerType.Import,
            CreatedById = Guid.Parse("F392209E-123E-4651-A5A4-0B1D6CF9FF9D"),
            ModifiedById = Guid.Parse("F392209E-123E-4651-A5A4-0B1D6CF9FF9D"),
            CreatedAt = DateTime.UtcNow,
            ModifiedAt = DateTime.UtcNow
        };
        layer.Name = $"L{layer.Number}-I-{name}-{year}/{month}-{DateTime.Now:yyyyMMddHHmm}";

        try
        {
            var dataRangeResponse = _googleSheetValues.Get(sheetId, $"{sheetTabName}!{dataRange}").Execute();
            var data = dataRangeResponse.Values;

            _logger.LogDebug("MorskaD1: Retrieved {RowCount} rows from Google Sheet", data?.Count ?? 0);

            var newRecords = (from t in data
                            where t.Count > 1 && (string)t[0] != string.Empty
                            select new Record
                            {
                                Id = Guid.NewGuid(),
                                Code = t[0].ToString(),
                                Value1 = IndexExists(t, 3) ? ParseValue(t[3]?.ToString()) : null,
                                Value2 = IndexExists(t, 4) ? ParseValue(t[4]?.ToString()) : null,
                                Value3 = IndexExists(t, 5) ? ParseValue(t[5]?.ToString()) : null,
                                Value4 = IndexExists(t, 6) ? ParseValue(t[6]?.ToString()) : null,
                                Value5 = IndexExists(t, 7) ? ParseValue(t[7]?.ToString()) : null,
                                Value6 = IndexExists(t, 8) ? ParseValue(t[8]?.ToString()) : null,
                                Value7 = IndexExists(t, 9) ? ParseValue(t[9]?.ToString()) : null,
                                Value8 = IndexExists(t, 10) ? ParseValue(t[10]?.ToString()) : null,
                                Value9 = IndexExists(t, 11) ? ParseValue(t[11]?.ToString()) : null,
                                Value10 = IndexExists(t, 12) ? ParseValue(t[12]?.ToString()) : null,
                                Value11 = IndexExists(t, 13) ? ParseValue(t[13]?.ToString()) : null,
                                Value12 = IndexExists(t, 14) ? ParseValue(t[14]?.ToString()) : null,
                                Value13 = IndexExists(t, 15) ? ParseValue(t[15]?.ToString()) : null,
                                Value14 = IndexExists(t, 16) ? ParseValue(t[16]?.ToString()) : null,
                                Value15 = IndexExists(t, 17) ? ParseValue(t[17]?.ToString()) : null,
                                CreatedAt = DateTime.UtcNow,
                                ModifiedAt = DateTime.UtcNow
                            }).ToList();

            _db.Layers.Add(layer);
            
            SaveRecords(layer.Id, newRecords);
            _db.SaveChanges();

            _logger.LogInformation("MorskaD1: Successfully imported {RecordCount} records for layer {LayerName} ({LayerId})", 
                newRecords.Count, layer.Name, layer.Id);
        }
        catch (Exception e)
        {
            _logger.LogError(e, "MorskaD1: Error importing data from Google Sheet {SheetId}", sheetId);
            throw;
        }
    }

    private void SaveRecords(Guid layerId, ICollection<Record> records)
    {
        var toDelete = _db.Records.Where(x => x.LayerId == layerId).ToList();
        if (toDelete.Count > 0)
        {
            _db.Records.RemoveRange(toDelete);
        }

        foreach (var record in records)
        {
            record.CreatedById = Guid.Parse("F392209E-123E-4651-A5A4-0B1D6CF9FF9D");
            record.CreatedAt = DateTime.UtcNow;
            record.ModifiedById = Guid.Parse("F392209E-123E-4651-A5A4-0B1D6CF9FF9D");
            record.ModifiedAt = DateTime.UtcNow;
            record.LayerId = layerId;
            _db.Records.Add(record);
        }

        _logger.LogDebug("MorskaD1: Saved {RecordCount} records for layer {LayerId}", records.Count, layerId);
    }

    private double? ParseValue(string? value)
    {
        if (string.IsNullOrEmpty(value) || value == "#DIV/0!") return null;
        value = new string(value.Where(c => char.IsDigit(c) || c == '.' || c == ',' || c == '-').ToArray());
        try
        {
            double.TryParse(value, CultureInfo.GetCultureInfo("pl-PL"), out var result);
            return result;
        }
        catch (FormatException e)
        {
            _logger.LogDebug("MorskaD1: Failed to parse value '{Value}': {Error}", value, e.Message);
            return null;
        }
    }

    private bool IndexExists(IList<object> array, int index)
    {
        return array != null && index >= 0 && index < array.Count;
    }
}