using DiunaBIWebAPI.dataProcessors;
using Microsoft.EntityFrameworkCore;
using WebAPI.Controllers;
using WebAPI.Models;

namespace WebAPI.dataProcessors;

public class T3SingleSourceProcessor(
    AppDbContext db,
    LayersController controller)
{
    public void Process(Layer processWorker)
    {
        var year = int.Parse(processWorker.Records?.SingleOrDefault(x => x.Code == "Year")?.Desc1!);
        var month = int.Parse(processWorker.Records?.SingleOrDefault(x => x.Code == "Month")?.Desc1!);
        var sourceLayer = processWorker.Records?.SingleOrDefault(x => x.Code == "SourceLayer")?.Desc1;
        if (sourceLayer == null)
        {
            throw new Exception("SourceLayer record not found");
        }
        var sourceImportWorker = db.Layers.SingleOrDefault(x => x.Name == sourceLayer);
        if (sourceImportWorker == null)
        {
            throw new Exception("SourceImportWorkerL layer not found");
        }
        var source= processWorker.Records?.SingleOrDefault(x => x.Code == "Source")?.Desc1;
        if (sourceLayer == null)
        {
            throw new Exception("Source record not found");
        }

        var processedLayer = db.Layers
            .Where(x => x.ParentId == processWorker.Id)
            .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}/{month:D2}-{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 = db.Layers
            .Include(x => x.Records)
            .Where(x => x.ParentId == sourceImportWorker.Id
                        && !x.IsDeleted)
            .OrderBy(x => x.CreatedAt)
            .ToList();
        if (dataSources.Count == 0)
        {
            throw new Exception($"DataSources are empty, {sourceImportWorker.Name}");
        }


        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
            };

            var lastDayInMonth = DateTime.DaysInMonth(year, month);
            //day 1
            var firstVal = codeRecords
                .Where(x => x.CreatedAt.Date <= new DateTime(year, month, 1)).MaxBy(x => x.CreatedAt)?.Value1 ?? 0;
            ProcessHelper.SetValue(processedRecord, 1, firstVal);
            var previousValue = firstVal;
            //days 2-29/30
            for (var i=2; i<lastDayInMonth; i++)
            {
                var dayVal = codeRecords
                    .Where(x => x.CreatedAt.Day == i && x.CreatedAt.Month == month).MaxBy(x => x.CreatedAt)?.Value1;
                if (dayVal == null)
                {
                    ProcessHelper.SetValue(processedRecord, i, 0);
                } else
                {
                    var processedVal = dayVal - previousValue;
                    ProcessHelper.SetValue(processedRecord, i, processedVal);
                    previousValue = (double)dayVal;
                }
            }
            //last day
            var lastVal = codeRecords
                .Where(x => x.CreatedAt.Date >= new DateTime(year, month, lastDayInMonth)).MaxBy(x => x.CreatedAt)?.Value1;

            if (lastVal == null)
            {
                ProcessHelper.SetValue(processedRecord, lastDayInMonth, 0);
            } else
            {
                ProcessHelper.SetValue(processedRecord, lastDayInMonth, (double)lastVal - previousValue);
            }

            // copy last value
            var valueToCopy = codeRecords.MaxBy(x => x.CreatedAt)?.Value1;
            ProcessHelper.SetValue(processedRecord, 32, valueToCopy);

            newRecords.Add(processedRecord);
        }
            
        if (isNew)
        {
            db.Layers.Add(processedLayer);
        } else
        {
            db.Layers.Update(processedLayer);
        }
        controller.SaveRecords(processedLayer.Id, newRecords, Guid.Parse("F392209E-123E-4651-A5A4-0B1D6CF9FF9D"));
        db.SaveChanges();
    }
        
}