using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Text.Json.Serialization;
using HardwareMonitorStatusWindow.Service;

namespace HardwareMonitorStatusWindow.StatusWindow;

public class SensorEntry : INotifyDataErrorInfo, INotifyPropertyChanged
{
    private readonly DataErrorDictionary _dataErrorDictionary;

    public SensorEntry()
    {
        _dataErrorDictionary = new DataErrorDictionary();
        _dataErrorDictionary.ErrorsChanged += DataErrorDictionaryErrorsChanged;
    }

    public string Label
    {
        get;
        set
        {
            if (!ValidateLabel(value))
                return;

            SetField(ref field, value);
        }
    }

    public string HardwareId
    {
        get;
        set
        {
            SetField(ref field, value);
            OnPropertyChanged(nameof(Hardware));
        }
    }

    public string SensorId
    {
        get;
        set
        {
            SetField(ref field, value);
            OnPropertyChanged(nameof(Sensor));
        }
    }

    [JsonIgnore]
    public Hardware? Hardware => Data.ComputerHardware.FirstOrDefault(h => h.Identifier.ToString() == HardwareId);

    [JsonIgnore]
    public Sensor? Sensor => Hardware?.Sensors.FirstOrDefault(s => s.Identifier.ToString() == SensorId);

    [JsonIgnore]
    public bool HasErrors => _dataErrorDictionary.Any();

    public IEnumerable GetErrors(string propertyName)
    {
        return _dataErrorDictionary.GetErrors(propertyName);
    }

    public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged;

    private void DataErrorDictionaryErrorsChanged(object sender, DataErrorsChangedEventArgs e)
    {
        ErrorsChanged?.Invoke(this, new DataErrorsChangedEventArgs(e.PropertyName));
    }

    private bool ValidateLabel(string newValue)
    {
        _dataErrorDictionary.ClearErrors(nameof(Label));

        if (!string.IsNullOrWhiteSpace(newValue))
            return true;

        _dataErrorDictionary.AddError(nameof(Label), "Label cannot be empty");

        return false;
    }

    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }

    protected bool SetField<T>(ref T field, T value, [CallerMemberName] string propertyName = null)
    {
        if (EqualityComparer<T>.Default.Equals(field, value)) return false;
        field = value;
        OnPropertyChanged(propertyName);
        return true;
    }

    public string SensorValueFormat
    {
        get
        {
            return Sensor?.Type switch
            {
                SensorType.Voltage => "{0:F3} V",
                SensorType.Current => "{0:F3} A",
                SensorType.Clock => "{0:F1} MHz",
                SensorType.Load => "{0:F1} %",
                SensorType.Temperature => "{0:F1} °C",
                SensorType.Fan => "{0:F0} RPM",
                SensorType.Flow => "{0:F1} L/h",
                SensorType.Control => "{0:F1} %",
                SensorType.Level => "{0:F1} %",
                SensorType.Power => "{0:F1} W",
                SensorType.Data => "{0:F1} GB",
                SensorType.SmallData => "{0:F1} MB",
                SensorType.Factor => "{0:F3}",
                SensorType.Frequency => "{0:F1} Hz",
                SensorType.Throughput => "{0:F1} B/s",
                SensorType.TimeSpan => "{0:g}",
                SensorType.Timing => "{0:F3} ns",
                SensorType.Energy => "{0:F0} mWh",
                SensorType.Noise => "{0:F0} dBA",
                SensorType.Conductivity => "{0:F1} µS/cm",
                SensorType.Humidity => "{0:F0} %",
                _ => string.Empty
            };
        }
    }
}