using DiunaBI.Core.Services;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using DiunaBI.Core.Models;
using DiunaBI.Core.Database.Context;
using DiunaBI.Core.Services.Calculations;

namespace DiunaBI.Plugins.Morska.Processors;

public class T3MultiSourceSummaryProcessor : MorskaBaseProcessor
{
    public override string ProcessorType => "T3.MultiSourceSummary";
    
    private readonly AppDbContext _db;
    private readonly ILogger<T3MultiSourceSummaryProcessor> _logger;

    public T3MultiSourceSummaryProcessor(
        AppDbContext db,
        ILogger<T3MultiSourceSummaryProcessor> logger)
    {
        _db = db;
        _logger = logger;
    }

    public override void Process(Layer processWorker)
    {
        _logger.LogInformation("T3MultiSourceSummary: Starting processing for {ProcessWorkerName} ({ProcessWorkerId})", 
            processWorker.Name, processWorker.Id);

        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 sources = processWorker.Records?.Where(x => x.Code == "Source").ToList();
        if (sources!.Count == 0)
        {
            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}/{month:D2}-AA-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 = sources.Select(source => _db.Layers.Where(x => x.Type == LayerType.Processed && !x.IsDeleted && !x.IsCancelled && x.Name != null && x.Name.Contains($"{year}/{month:D2}-{source.Desc1}-T3"))
                .Include(x => x.Records)
                .AsNoTracking()
                .FirstOrDefault())
            .OfType<Layer>()
            .ToList();

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

        var allRecords = dataSources.SelectMany(x => x.Records!).ToList();
        var baseCodes = allRecords.Select(x => x.Code!.Remove(0, 1)).Distinct().ToList();

        foreach (var baseCode in baseCodes)
        {
            var codeRecords = allRecords.Where(x =>
                    x.Code![1..] == baseCode)
                .ToList();
            var processedRecord = new Record
            {
                Id = Guid.NewGuid(),
                Code = $"9{baseCode}",
                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);
        }

        // Dynamic Codes
        var dynamicCodes = processWorker.Records?
            .Where(x => x.Code!.Contains("DynamicCode-"))
            .OrderBy(x => int.Parse(x.Code!.Split('-')[1])).ToList();
        
        if (dynamicCodes != null && dynamicCodes.Count != 0)
        {
            foreach (var dynamicCode in dynamicCodes)
            {
                try
                {
                    if (dynamicCode.Desc1 == null)
                    {
                        _logger.LogWarning("T3MultiSourceSummary: Formula in Record {RecordId} is missing. Process: {ProcessName} ({ProcessId})", 
                            dynamicCode.Id, processWorker.Name, processWorker.Id);
                        continue;
                    }

                    var calc = new BaseCalc(dynamicCode.Desc1);
                    if (!calc.IsFormulaCorrect())
                    {
                        _logger.LogWarning("T3MultiSourceSummary: Formula {Expression} in Record {RecordId} is not correct. Process: {ProcessName} ({ProcessId})", 
                            calc.Expression, dynamicCode.Id, processWorker.Name, processWorker.Id);
                        continue;
                    }

                    try
                    {
                        newRecords.Add(calc.CalculateT3(newRecords));
                    }
                    catch (Exception e)
                    {
                        _logger.LogWarning(e, "T3MultiSourceSummary: Formula {Expression} in Record {RecordId} calculation error. Process: {ProcessName} ({ProcessId})", 
                            calc.Expression, dynamicCode.Id, processWorker.Name, processWorker.Id);
                    }
                }
                catch (Exception e)
                {
                    _logger.LogWarning(e, "T3MultiSourceSummary: Calculation error for DynamicCode {RecordId}. Process: {ProcessName} ({ProcessId})", 
                        dynamicCode.Id, processWorker.Name, processWorker.Id);
                }
            }
        }

        if (isNew)
        {
            _db.Layers.Add(processedLayer);
        }
        else
        {
            _db.Layers.Update(processedLayer);
        }

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

        _logger.LogInformation("T3MultiSourceSummary: 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("T3MultiSourceSummary: Saved {RecordCount} records for layer {LayerId}", records.Count, layerId);
    }
}