using Google.Apis.Sheets.v4;
using Microsoft.EntityFrameworkCore;
using WebAPI.Controllers;
using WebAPI.Models;

namespace WebAPI.dataProcessors
{
    public class T3SourceSummaryProcessor
    {
        private AppDbContext db;
        private SpreadsheetsResource.ValuesResource googleSheetValues;
        private LayersController controller;

        public T3SourceSummaryProcessor(
            AppDbContext _db,
            SpreadsheetsResource.ValuesResource _googleSheetValues,
            LayersController _controller)
        {
            db = _db;
            googleSheetValues = _googleSheetValues;
            controller = _controller;
        }

        public void process(Layer processWorker)
        {
            string? sourceName = processWorker?.Records?.Single(x => x.Code == "Source")?.Desc1;
            int year = int.Parse(processWorker?.Records?.Single(x => x.Code == "Year")?.Desc1 ?? "0");
            if (year == 0)
            {
                throw new Exception($"Year is empty, {processWorker!.Name}");
            }

            Layer? processedLayer = db.Layers
                                    .Where(x => x.ParentId == processWorker!.Id
                                                && !x.IsDeleted)
                                    .OrderByDescending(x => x.CreatedAt)
                                    .FirstOrDefault();

            bool isNew = false;
            if (processedLayer == null)
            {
                isNew = true;
                processedLayer = new Layer
                {
                    Id = Guid.NewGuid(),
                    Source = "",
                    Type = LayerType.processed,
                    ParentId = processWorker!.Id,
                    Number = db.Layers.Count() + 1,
                };
                processedLayer.Name = $"L{processedLayer.Number}-P-{year}/13-{sourceName}-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.Sources = new List<ProcessSource>();
            processedLayer.ModifiedById = Guid.Parse("F392209E-123E-4651-A5A4-0B1D6CF9FF9D");
            processedLayer.ModifiedAt = DateTime.UtcNow;

            List<Record> newRecords = new List<Record>();

            List<Layer> sources = new List<Layer>();
            for (int i=1; i<13; i++)
            {
                Layer? source = db.Layers.Where(x =>
                    x.Type == LayerType.processed
                    && !x.IsDeleted
                    && x.Name.Contains($"{year}/{i}-{sourceName}-T3"))
                    .Include(x => x.Records)
                    .FirstOrDefault();
                if (source != null)
                {
                    sources.Add(source);
                }
            }

            if (sources.Count == 0)
            {
                throw new Exception($"DataSources are empty, {processWorker!.Name}");
            }

            List<Record> allRecords = sources.SelectMany(x => x.Records!).ToList();

            foreach (Record baseRecord in sources.Last()?.Records!)
            {
                List<Record> codeRecords = allRecords.Where(x => x.Code == baseRecord.Code).ToList();
                Record processedRecord = new Record
                {
                    Id = Guid.NewGuid(),
                    Code = baseRecord.Code,
                    CreatedAt = DateTime.UtcNow,
                    ModifiedAt = DateTime.UtcNow,
                    Value1 = codeRecords.Sum(x => x.Value32)
                };
                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();
        }
    }
}