using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using BatteryCostAnalysis.Models;

namespace BatteryCostAnalysis.Services
{
    public class DataLoader
    {
        public static List<EnergyData> LoadAndProcessData(string filePath)
        {
            var energyData = new List<EnergyData>();
            var lines = File.ReadAllLines(filePath).Skip(1); // Skip header
            
            foreach (var line in lines)
            {
                var parts = line.Split(';');
                if (parts.Length < 9) continue;
                
                var date = DateTime.Parse(parts[0], new CultureInfo("nl-BE"));
                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;
                }
            }
            
            return energyData;
        }
    }
}