using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using Google.Apis.Sheets.v4;
using DiunaBI.Core.Models;
using DiunaBI.Database.Context;
using DiunaBI.Core.Services;

namespace DiunaBI.Plugins.Morska.Processors;

public class T3SourceYearSummaryProcessor : MorskaBaseProcessor
{
    public override string ProcessorType => "T3.SourceYearSummary";

    private readonly AppDbContext _db;
    private readonly SpreadsheetsResource.ValuesResource _googleSheetValues;
    private readonly ILogger<T3SourceYearSummaryProcessor> _logger;

    public T3SourceYearSummaryProcessor(
        AppDbContext db,
        SpreadsheetsResource.ValuesResource googleSheetValues,
        ILogger<T3SourceYearSummaryProcessor> logger)
    {
        _db = db;
        _googleSheetValues = googleSheetValues;
        _logger = logger;
    }

    public override void Process(Layer processWorker)
    {
        _logger.LogInformation("T3SourceYearSummary: Starting processing for {ProcessWorkerName} ({ProcessWorkerId})", 
            processWorker.Name, processWorker.Id);

        var year = processWorker.Records?.SingleOrDefault(x => x.Code == "Year")?.Desc1;
        var source = processWorker.Records?.SingleOrDefault(x => x.Code == "Source")?.Desc1;
        if (source == null)
        {
            throw new Exception("Source record not found");
        }

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

        var isNew = false;
        if (processedLayer == null)
        {
            isNew = true;
            processedLayer = new Layer
            {
                Id = Guid.NewGuid(),
                Type = LayerType.Processed,
                ParentId = processWorker.Id,
                Number = _db.Layers.Count() + 1
            };
            processedLayer.Name = $"L{processedLayer.Number}-P-{year}/13-{source}-T3";
            processedLayer.CreatedById = Guid.Parse("F392209E-123E-4651-A5A4-0B1D6CF9FF9D");
            processedLayer.ModifiedById = Guid.Parse("F392209E-123E-4651-A5A4-0B1D6CF9FF9D");
            processedLayer.CreatedAt = DateTime.UtcNow;
            processedLayer.ModifiedAt = DateTime.UtcNow;
        }

        processedLayer.ModifiedById = Guid.Parse("F392209E-123E-4651-A5A4-0B1D6CF9FF9D");
        processedLayer.ModifiedAt = DateTime.UtcNow;

        var newRecords = new List<Record>();

        var dataSources = new List<Layer>();
        for (var i = 1; i < 13; i++)
        {
            var j = i;
            var dataSource = _db.Layers.Where(x =>
                    x.Type == LayerType.Processed
                    && !x.IsDeleted && !x.IsCancelled
                    && x.Name != null && x.Name.Contains($"{year}/{j:D2}-{source}-T3"))
                .Include(x => x.Records)
                .AsNoTracking()
                .FirstOrDefault();
            if (dataSource != null)
            {
                dataSources.Add(dataSource);
            }
        }

        if (dataSources.Count == 0)
        {
            throw new Exception("DataSources are empty");
        }

        var allRecords = dataSources.SelectMany(x => x.Records!).ToList();

        foreach (var baseRecord in dataSources.Last().Records!)
        {
            var codeRecords = allRecords.Where(x => x.Code == baseRecord.Code).ToList();
            var processedRecord = new Record
            {
                Id = Guid.NewGuid(),
                Code = baseRecord.Code,
                CreatedAt = DateTime.UtcNow,
                ModifiedAt = DateTime.UtcNow
            };
            for (var i = 1; i < 33; i++)
            {
                ProcessHelper.SetValue(processedRecord, i,
                    codeRecords.Sum(x => ProcessHelper.GetValue(x, i)));
            }
            newRecords.Add(processedRecord);
        }

        if (isNew)
        {
            _db.Layers.Add(processedLayer);
        }
        else
        {
            _db.Layers.Update(processedLayer);
        }
        
        SaveRecords(processedLayer.Id, newRecords);
        _db.SaveChanges();

        _logger.LogInformation("T3SourceYearSummary: Successfully completed processing for {ProcessWorkerName} ({ProcessWorkerId})", 
            processWorker.Name, processWorker.Id);
    }

    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("T3SourceYearSummary: Saved {RecordCount} records for layer {LayerId}", records.Count, layerId);
    }
}