using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using BattSim.Models;
using Microsoft.AspNetCore.Components.Forms;

namespace BattSim.Services
{
    public static class DataLoader
    {
        public static async Task<List<EnergyData>> LoadAndProcessData(IBrowserFile file)
        {
            var energyData = new List<EnergyData>();
            await using var stream = file.OpenReadStream();
            using var reader = new StreamReader(stream);

            // Skip header
            await reader.ReadLineAsync();

            string line;
            while ((line = await reader.ReadLineAsync()) != null)
            {
                var parts = line.Split(';');
                if (parts.Length < 9)
                {
                    Console.WriteLine($"Skipping malformed line: {line}");
                    continue;
                }

                try
                {
                    var date = DateOnly.ParseExact(parts[0].Length == 10 ? parts[0] : "0"+parts[0], "dd/MM/yyyy", CultureInfo.InvariantCulture);
                    var register = parts[7].Trim();
                    var volumeStr = parts[8].Trim();
                    var volume = string.IsNullOrEmpty(volumeStr)
                        ? 0
                        : double.Parse(volumeStr.Replace(",", "."), CultureInfo.InvariantCulture);

                    var existing = energyData.FirstOrDefault(e => e.Date == date);
                    if (existing == null)
                    {
                        existing = new EnergyData { Date = date };
                        energyData.Add(existing);
                    }

                    switch (register)
                    {
                        case "Afname Dag":
                            existing.DayConsumption = volume;
                            break;
                        case "Afname Nacht":
                            existing.NightConsumption = volume;
                            break;
                        case "Injectie Dag":
                            existing.DayProduction = volume;
                            break;
                        case "Injectie Nacht":
                            existing.NightProduction = volume;
                            break;
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine($"Error parsing line: {line}. Exception: {ex.Message}");
                }
            }
            return energyData;
        }
}
}