using System.Globalization;
using DiunaBI.Domain.Entities;
using DiunaBI.Infrastructure.Data;
using DiunaBI.Infrastructure.Services;
using Google.Apis.Sheets.v4;
using Google.Apis.Sheets.v4.Data;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;

namespace DiunaBI.Plugins.Morska.Processors;

public class MorskaT4R2Processor : MorskaBaseProcessor
{
    public override string ProcessorType => "Morska.Process.T4.R2";

    private readonly AppDbContext _db;
    private readonly SpreadsheetsResource.ValuesResource _googleSheetValues;
    private readonly ILogger<MorskaT4R2Processor> _logger;

    // Configuration properties loaded from layer records
    private int Year { get; set; }
    private List<Record>? Sources { get; set; }
    private string? LayerName { get; set; }
    private string? ReportSheetName { get; set; }
    private string? InvoicesSheetName { get; set; }

    public MorskaT4R2Processor(
        AppDbContext db,
        SpreadsheetsResource.ValuesResource googleSheetValues,
        ILogger<MorskaT4R2Processor> logger)
    {
        _db = db;
        _googleSheetValues = googleSheetValues;
        _logger = logger;
    }

    public override void Process(Layer processWorker)
    {
        try
        {
            _logger.LogInformation("{ProcessorType}: Starting processing for {ProcessWorkerName} ({ProcessWorkerId})",
                ProcessorType, processWorker.Name, processWorker.Id);

            // Load configuration from layer records
            LoadConfiguration(processWorker);

            // Validate required configuration
            ValidateConfiguration();

            // Perform the actual processing
            PerformProcessing(processWorker);

            _logger.LogInformation("{ProcessorType}: Successfully completed processing for {ProcessWorkerName}",
                ProcessorType, processWorker.Name);
        }
        catch (Exception e)
        {
            _logger.LogError(e, "{ProcessorType}: Failed to process {ProcessWorkerName} ({ProcessWorkerId})",
                ProcessorType, processWorker.Name, processWorker.Id);
            throw;
        }
    }

    private void LoadConfiguration(Layer processWorker)
    {
        if (processWorker.Records == null)
        {
            throw new InvalidOperationException("ProcessWorker has no records");
        }

        // Load year
        var yearStr = GetRecordValue(processWorker.Records, "Year");
        if (string.IsNullOrEmpty(yearStr) || !int.TryParse(yearStr, out var year))
        {
            throw new InvalidOperationException("Year record not found or invalid");
        }
        Year = year;

        // Load sources
        Sources = processWorker.Records.Where(x => x.Code == "Source").ToList();
        if (Sources.Count == 0)
        {
            throw new InvalidOperationException("Source records not found");
        }

        // Load layer name
        LayerName = GetRecordValue(processWorker.Records, "LayerName");
        if (string.IsNullOrEmpty(LayerName))
        {
            throw new InvalidOperationException("LayerName record not found");
        }

        // Load report sheet name
        ReportSheetName = GetRecordValue(processWorker.Records, "GoogleSheetName");
        if (string.IsNullOrEmpty(ReportSheetName))
        {
            throw new InvalidOperationException("GoogleSheetName record not found");
        }

        // Load invoices sheet name
        InvoicesSheetName = GetRecordValue(processWorker.Records, "GoogleSheetName-Invoices");
        if (string.IsNullOrEmpty(InvoicesSheetName))
        {
            throw new InvalidOperationException("GoogleSheetName-Invoices record not found");
        }

        _logger.LogDebug("{ProcessorType}: Configuration loaded - Year: {Year}, Sources: {SourceCount}, LayerName: {LayerName}",
            ProcessorType, Year, Sources.Count, LayerName);
    }

    private void ValidateConfiguration()
    {
        var errors = new List<string>();

        if (Year < 2000 || Year > 3000) errors.Add($"Invalid year: {Year}");
        if (Sources == null || Sources.Count == 0) errors.Add("No sources configured");
        if (string.IsNullOrEmpty(LayerName)) errors.Add("LayerName is required");
        if (string.IsNullOrEmpty(ReportSheetName)) errors.Add("ReportSheetName is required");
        if (string.IsNullOrEmpty(InvoicesSheetName)) errors.Add("InvoicesSheetName is required");

        if (errors.Any())
        {
            throw new InvalidOperationException($"Configuration validation failed: {string.Join(", ", errors)}");
        }

        _logger.LogDebug("{ProcessorType}: Configuration validation passed", ProcessorType);
    }

    private void PerformProcessing(Layer processWorker)
    {
        _logger.LogDebug("{ProcessorType}: Processing data for Year: {Year} with {SourceCount} sources",
            ProcessorType, Year, Sources!.Count);

        // Get or create processed layer
        var processedLayer = GetOrCreateProcessedLayer(processWorker);

        // Process records for all sources
        var newRecords = ProcessSources();

        // Save results
        SaveProcessedLayer(processedLayer, newRecords);

        // Update Google Sheets reports
        UpdateGoogleSheetReport(processedLayer.Id);

        _logger.LogInformation("{ProcessorType}: Successfully processed {RecordCount} records for layer {LayerName} ({LayerId})",
            ProcessorType, newRecords.Count, processedLayer.Name, processedLayer.Id);
    }

    private Layer GetOrCreateProcessedLayer(Layer processWorker)
    {
        var processedLayer = _db.Layers
            .Where(x => x.ParentId == processWorker.Id && !x.IsDeleted && !x.IsCancelled)
            .OrderByDescending(x => x.CreatedAt)
            .FirstOrDefault();

        if (processedLayer == null)
        {
            processedLayer = new Layer
            {
                Id = Guid.NewGuid(),
                Type = LayerType.Processed,
                ParentId = processWorker.Id,
                Number = _db.Layers.Count() + 1,
                CreatedById = Guid.Parse("F392209E-123E-4651-A5A4-0B1D6CF9FF9D"),
                ModifiedById = Guid.Parse("F392209E-123E-4651-A5A4-0B1D6CF9FF9D"),
                CreatedAt = DateTime.UtcNow,
                ModifiedAt = DateTime.UtcNow
            };
            processedLayer.Name = $"L{processedLayer.Number}-{LayerName}";

            _logger.LogDebug("{ProcessorType}: Created new processed layer {LayerName}",
                ProcessorType, processedLayer.Name);
        }
        else
        {
            processedLayer.ModifiedById = Guid.Parse("F392209E-123E-4651-A5A4-0B1D6CF9FF9D");
            processedLayer.ModifiedAt = DateTime.UtcNow;

            _logger.LogDebug("{ProcessorType}: Using existing processed layer {LayerName}",
                ProcessorType, processedLayer.Name);
        }

        return processedLayer;
    }

    private List<Record> ProcessSources()
    {
        var newRecords = new List<Record>();

        foreach (var source in Sources!)
        {
            _logger.LogDebug("{ProcessorType}: Processing source {Source}",
                ProcessorType, source.Desc1);

            var sourceCodes = GetSourceCodes(source);
            var sourceRecords = ProcessSourceData(source, sourceCodes);
            newRecords.AddRange(sourceRecords);

            _logger.LogDebug("{ProcessorType}: Processed source {Source} - created {RecordCount} records",
                ProcessorType, source.Desc1, sourceRecords.Count);
        }

        _logger.LogDebug("{ProcessorType}: Total records created: {TotalRecordCount}",
            ProcessorType, newRecords.Count);

        return newRecords;
    }

    private List<int> GetSourceCodes(Record source)
    {
        var rawSourceCodes = GetRecordValue(Sources!, $"Codes-{source.Desc1}");
        if (string.IsNullOrEmpty(rawSourceCodes))
        {
            return new List<int>();
        }

        return ProcessHelper.ParseCodes(rawSourceCodes);
    }

    private List<Record> ProcessSourceData(Record source, List<int> sourceCodes)
    {
        var sourceRecords = new List<Record>();
        var lastSourceCodes = new List<string>();

        // Process monthly data (1-12)
        for (var month = 1; month <= 12; month++)
        {
            var monthRecords = ProcessMonthData(source, sourceCodes, month, lastSourceCodes);
            sourceRecords.AddRange(monthRecords);
        }

        // Process year summary (month 13)
        var yearSummaryRecords = ProcessYearSummaryData(source, sourceCodes);
        sourceRecords.AddRange(yearSummaryRecords);

        return sourceRecords;
    }

    private List<Record> ProcessMonthData(Record source, List<int> sourceCodes, int month, List<string> lastSourceCodes)
    {
        var monthRecords = new List<Record>();

        if (IsDataAvailableForMonth(month))
        {
            var dataSource = GetMonthDataSource(source, month);
            if (dataSource != null)
            {
                lastSourceCodes.Clear();
                lastSourceCodes.AddRange(dataSource.Records!.Select(x => x.Code!));

                var filteredRecords = FilterRecords(dataSource.Records!, sourceCodes);
                var processedRecords = CreateMonthRecords(filteredRecords, source, month);
                monthRecords.AddRange(processedRecords);

                _logger.LogDebug("{ProcessorType}: Processed month {Month} for source {Source} - {RecordCount} records",
                    ProcessorType, month, source.Desc1, processedRecords.Count);
            }
            else
            {
                _logger.LogWarning("{ProcessorType}: Data source {DataSource} not found",
                    ProcessorType, $"{Year}/{month:D2}-{source.Desc1}-T");
            }
        }
        else
        {
            // Future months - create zero value records (except for FK2)
            if (source.Desc1 != "FK2" && lastSourceCodes.Count > 0)
            {
                var futureRecords = CreateFutureMonthRecords(lastSourceCodes, sourceCodes, month);
                monthRecords.AddRange(futureRecords);

                _logger.LogDebug("{ProcessorType}: Created {RecordCount} zero-value records for future month {Month}",
                    ProcessorType, futureRecords.Count, month);
            }
        }

        return monthRecords;
    }

    private bool IsDataAvailableForMonth(int month)
    {
        return (Year == DateTime.UtcNow.Year && month <= DateTime.UtcNow.Month) || Year < DateTime.UtcNow.Year;
    }

    private Layer? GetMonthDataSource(Record source, int month)
    {
        return _db.Layers
            .Where(x => x.Type == LayerType.Processed &&
                    !x.IsDeleted && !x.IsCancelled &&
                    x.Name != null && x.Name.Contains($"{Year}/{month:D2}-{source.Desc1}-T"))
            .Include(x => x.Records)
            .AsNoTracking()
            .FirstOrDefault();
    }

    private List<Record> FilterRecords(IEnumerable<Record> records, List<int> sourceCodes)
    {
        return records
            .Where(x => sourceCodes.Count <= 0 || sourceCodes.Contains(int.Parse(x.Code!)))
            .ToList();
    }

    private List<Record> CreateMonthRecords(List<Record> filteredRecords, Record source, int month)
    {
        return filteredRecords.Select(x => new Record
        {
            Id = Guid.NewGuid(),
            Code = $"{x.Code}{month:D2}",
            CreatedAt = DateTime.UtcNow,
            ModifiedAt = DateTime.UtcNow,
            Value1 = source.Desc1 != "FK2" ? x.Value32 : x.Value1,
            Desc1 = x.Desc1
        }).ToList();
    }

    private List<Record> CreateFutureMonthRecords(List<string> lastSourceCodes, List<int> sourceCodes, int month)
    {
        return lastSourceCodes
            .Where(x => sourceCodes.Contains(int.Parse(x)))
            .Select(x => new Record
            {
                Id = Guid.NewGuid(),
                Code = $"{x}{month:D2}",
                CreatedAt = DateTime.UtcNow,
                ModifiedAt = DateTime.UtcNow,
                Value1 = 0
            }).ToList();
    }

    private List<Record> ProcessYearSummaryData(Record source, List<int> sourceCodes)
    {
        var dataSourceSum = _db.Layers
            .Where(x => x.Type == LayerType.Processed &&
                    !x.IsDeleted && !x.IsCancelled &&
                    x.Name != null && x.Name.Contains($"{Year}/13-{source.Desc1}-T"))
            .Include(x => x.Records)
            .AsNoTracking()
            .FirstOrDefault();

        if (dataSourceSum == null)
        {
            _logger.LogWarning("{ProcessorType}: Year summary data source {DataSource} not found",
                ProcessorType, $"{Year}/13-{source.Desc1}-T3");
            return new List<Record>();
        }

        var filteredRecords = FilterRecords(dataSourceSum.Records!, sourceCodes);
        var yearSummaryRecords = filteredRecords.Select(x => new Record
        {
            Id = Guid.NewGuid(),
            Code = $"{x.Code}13",
            CreatedAt = DateTime.UtcNow,
            ModifiedAt = DateTime.UtcNow,
            Value1 = x.Value32
        }).ToList();

        _logger.LogDebug("{ProcessorType}: Created {RecordCount} year summary records for source {Source}",
            ProcessorType, yearSummaryRecords.Count, source.Desc1);

        return yearSummaryRecords;
    }

    private void SaveProcessedLayer(Layer processedLayer, List<Record> newRecords)
    {
        var existsInDb = _db.Layers.Any(x => x.Id == processedLayer.Id);

        if (!existsInDb)
        {
            _db.Layers.Add(processedLayer);
            _logger.LogDebug("{ProcessorType}: Added new processed layer to database", ProcessorType);
        }
        else
        {
            _db.Layers.Update(processedLayer);
            _logger.LogDebug("{ProcessorType}: Updated existing processed layer in database", ProcessorType);
        }

        SaveRecords(processedLayer.Id, newRecords);
        _db.SaveChanges();

        _logger.LogDebug("{ProcessorType}: Saved {RecordCount} records for layer {LayerId}",
            ProcessorType, newRecords.Count, processedLayer.Id);
    }

    private void SaveRecords(Guid layerId, ICollection<Record> records)
    {
        // Remove existing records for this layer
        var toDelete = _db.Records.Where(x => x.LayerId == layerId).ToList();
        if (toDelete.Count > 0)
        {
            _db.Records.RemoveRange(toDelete);
            _logger.LogDebug("{ProcessorType}: Removed {DeletedCount} existing records for layer {LayerId}",
                ProcessorType, toDelete.Count, layerId);
        }

        // Add new records
        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("{ProcessorType}: Added {RecordCount} new records for layer {LayerId}",
            ProcessorType, records.Count, layerId);
    }

    private void UpdateGoogleSheetReport(Guid sourceId)
    {
        try
        {
            _logger.LogDebug("{ProcessorType}: Starting Google Sheets report update for layer {LayerId}",
                ProcessorType, sourceId);

            const string sheetId = "1FsUmk_YRIeeGzFCX9tuUJCaLyRtjutX2ZGAEU1DMfJQ";

            var processedLayer = GetProcessedLayerData(sourceId);
            if (processedLayer == null)
            {
                throw new InvalidOperationException($"Processed layer {sourceId} not found");
            }

            var codesRow = GetCodesFromSheet(sheetId);
            
            UpdateMonthlyData(sheetId, processedLayer, codesRow);
            UpdateYearSummary(sheetId, processedLayer, codesRow);
            UpdateTimestamps(sheetId, processedLayer);
            UpdateInvoicesData(sheetId, processedLayer);

            _logger.LogInformation("{ProcessorType}: Successfully updated Google Sheets reports",
                ProcessorType);
        }
        catch (Exception e)
        {
            _logger.LogError(e, "{ProcessorType}: Failed to update Google Sheets report for layer {LayerId}",
                ProcessorType, sourceId);
            throw;
        }
    }

    private Layer? GetProcessedLayerData(Guid sourceId)
    {
        return _db.Layers
            .Where(x => x.Id == sourceId && !x.IsDeleted && !x.IsCancelled)
            .Include(x => x.Records)
            .AsNoTracking()
            .FirstOrDefault();
    }

    private IList<object> GetCodesFromSheet(string sheetId)
    {
        var request = _googleSheetValues.Get(sheetId, "C4:Z4");
        var response = request.Execute();
        return response.Values[0];
    }

    private void UpdateMonthlyData(string sheetId, Layer processedLayer, IList<object> codesRow)
    {
        const int startRow = 6;

        for (var month = 1; month <= 12; month++)
        {
            var values = new List<object>();
            var monthStr = month < 10 ? $"0{month}" : month.ToString();
            
            foreach (string code in codesRow)
            {
                var record = processedLayer.Records?.SingleOrDefault(x => x.Code == $"{code}{monthStr}");
                values.Add(record?.Value1?.ToString(CultureInfo.GetCultureInfo("pl-PL")) ?? "0");
            }

            var valueRange = new ValueRange
            {
                Values = new List<IList<object>> { values }
            };

            var row = (startRow + month).ToString();
            var update = _googleSheetValues.Update(valueRange, sheetId, $"{ReportSheetName}!C{row}:XZ{row}");
            update.ValueInputOption = SpreadsheetsResource.ValuesResource.UpdateRequest.ValueInputOptionEnum.USERENTERED;
            update.Execute();

            _logger.LogDebug("{ProcessorType}: Updated month {Month} data in Google Sheet",
                ProcessorType, month);
        }
    }

    private void UpdateYearSummary(string sheetId, Layer processedLayer, IList<object> codesRow)
    {
        const int startRow = 6;
        var valuesSum = new List<object>();
        var emptyRow = new List<object>();
        
        foreach (string code in codesRow)
        {
            var record = processedLayer.Records?.SingleOrDefault(x => x.Code == $"{code}13");
            emptyRow.Add("");
            valuesSum.Add(record?.Value1?.ToString(CultureInfo.GetCultureInfo("pl-PL")) ?? "0");
        }

        // Insert empty row before sum
        var rowEmpty = (startRow + 13).ToString();
        var valueRangeEmpty = new ValueRange
        {
            Values = new List<IList<object>> { emptyRow }
        };
        var updateEmpty = _googleSheetValues.Update(valueRangeEmpty, sheetId, $"{ReportSheetName}!C{rowEmpty}:XZ{rowEmpty}");
        updateEmpty.ValueInputOption = SpreadsheetsResource.ValuesResource.UpdateRequest.ValueInputOptionEnum.USERENTERED;
        updateEmpty.Execute();

        // Update sum row
        var rowSum = (startRow + 14).ToString();
        var valueRangeSum = new ValueRange
        {
            Values = new List<IList<object>> { valuesSum }
        };
        var updateSum = _googleSheetValues.Update(valueRangeSum, sheetId, $"{ReportSheetName}!C{rowSum}:XZ{rowSum}");
        updateSum.ValueInputOption = SpreadsheetsResource.ValuesResource.UpdateRequest.ValueInputOptionEnum.USERENTERED;
        updateSum.Execute();

        _logger.LogDebug("{ProcessorType}: Updated year summary data in Google Sheet", ProcessorType);
    }

    private void UpdateTimestamps(string sheetId, Layer processedLayer)
    {
        // Update UTC time
        var timeUtc = processedLayer.ModifiedAt.ToString("dd.MM.yyyy HH:mm:ss", CultureInfo.GetCultureInfo("pl-PL"));
        var valueRangeUtcTime = new ValueRange
        {
            Values = new List<IList<object>> { new List<object> { timeUtc } }
        };
        var updateTimeUtc = _googleSheetValues.Update(valueRangeUtcTime, sheetId, $"{ReportSheetName}!G1");
        updateTimeUtc.ValueInputOption = SpreadsheetsResource.ValuesResource.UpdateRequest.ValueInputOptionEnum.USERENTERED;
        updateTimeUtc.Execute();

        // Update Warsaw time
        var warsawTimeZone = TimeZoneInfo.FindSystemTimeZoneById("Central European Standard Time");
        var warsawTime = TimeZoneInfo.ConvertTimeFromUtc(processedLayer.ModifiedAt.ToUniversalTime(), warsawTimeZone);
        var timeWarsaw = warsawTime.ToString("dd.MM.yyyy HH:mm:ss", CultureInfo.GetCultureInfo("pl-PL"));
        var valueRangeWarsawTime = new ValueRange
        {
            Values = new List<IList<object>> { new List<object> { timeWarsaw } }
        };
        var updateTimeWarsaw = _googleSheetValues.Update(valueRangeWarsawTime, sheetId, $"{ReportSheetName}!G2");
        updateTimeWarsaw.ValueInputOption = SpreadsheetsResource.ValuesResource.UpdateRequest.ValueInputOptionEnum.USERENTERED;
        updateTimeWarsaw.Execute();

        _logger.LogDebug("{ProcessorType}: Updated timestamps in Google Sheet - UTC: {TimeUtc}, Warsaw: {TimeWarsaw}",
            ProcessorType, timeUtc, timeWarsaw);
    }

    private void UpdateInvoicesData(string sheetId, Layer processedLayer)
    {
        var invoices = processedLayer.Records!
            .Where(x => x.Code!.Length == 12)
            .OrderByDescending(x => x.Code)
            .ToList();

        var invoicesValues = new List<IList<object>>();
        var cleanUpValues = new List<IList<object>>();

        foreach (var invoice in invoices)
        {
            var invoiceDate = DateTime.ParseExact(invoice.Code!.Substring(0, 8), "yyyyMMdd", CultureInfo.InvariantCulture)
                .ToString("dd.MM.yyyy", CultureInfo.GetCultureInfo("pl-PL"));
            
            var invoiceRow = new List<object>
            {
                invoiceDate, "", invoice.Desc1!, invoice.Value1!
            };
            invoicesValues.Add(invoiceRow);

            var cleanupRow = new List<object> { "", "", "", "" };
            cleanUpValues.Add(cleanupRow);
        }

        // Clear existing data
        var cleanupValueRange = new ValueRange { Values = cleanUpValues };
        var cleanupInvoices = _googleSheetValues.Update(cleanupValueRange, sheetId, $"{InvoicesSheetName}!A6:E");
        cleanupInvoices.ValueInputOption = SpreadsheetsResource.ValuesResource.UpdateRequest.ValueInputOptionEnum.USERENTERED;
        cleanupInvoices.Execute();

        // Update with new data
        var invoicesValueRange = new ValueRange { Values = invoicesValues };
        var updateInvoices = _googleSheetValues.Update(invoicesValueRange, sheetId, $"{InvoicesSheetName}!A6:E");
        updateInvoices.ValueInputOption = SpreadsheetsResource.ValuesResource.UpdateRequest.ValueInputOptionEnum.USERENTERED;
        updateInvoices.Execute();

        _logger.LogDebug("{ProcessorType}: Updated {InvoiceCount} invoices in Google Sheet",
            ProcessorType, invoices.Count);
    }

    private string? GetRecordValue(ICollection<Record> records, string code)
    {
        return records.FirstOrDefault(x => x.Code == code)?.Desc1;
    }
}