using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Windows.Forms;
using OpenHardwareMonitor.Hardware;

namespace OpenHardwareMonitor.UI;

public partial class ParameterForm : Form
{
    private IReadOnlyList<IParameter> _parameters;
    private BindingList<ParameterRow> _parameterRows;

    public ParameterForm()
    {
        InitializeComponent();
        Theme.Current.Apply(this);
    }

    public IReadOnlyList<IParameter> Parameters
    {
        get
        {
            return _parameters;
        }
        set
        {
            _parameters = value;
            _parameterRows = new BindingList<ParameterRow>();

            foreach (IParameter parameter in _parameters)
            {
                _parameterRows.Add(new ParameterRow(parameter));
            }

            bindingSource.DataSource = _parameterRows;
        }
    }

    private class ParameterRow : INotifyPropertyChanged
    {
        public readonly IParameter Parameter;
        private float _value = float.NaN;
        private bool _default = true;

        public event PropertyChangedEventHandler PropertyChanged;

        private void NotifyPropertyChanged(String propertyName)
        {
            if (PropertyChanged != null)
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }

        public ParameterRow(IParameter parameter)
        {
            Parameter = parameter;
            Value = parameter.Value;
            Default = parameter.IsDefault;
        }

        public string Name
        {
            get { return Parameter.Name; }
        }

        public float Value
        {
            get { return _value; }
            set
            {
                _default = false;
                _value = value;
                NotifyPropertyChanged(nameof(Default));
                NotifyPropertyChanged(nameof(Value));
            }
        }

        public bool Default
        {
            get { return _default; }
            set
            {
                _default = value;
                if (_default)
                    _value = Parameter.DefaultValue;
                NotifyPropertyChanged(nameof(Default));
                NotifyPropertyChanged(nameof(Value));
            }
        }
    }

    private void DataGridView_RowEnter(object sender, DataGridViewCellEventArgs e)
    {
        if (e.RowIndex >= 0 && e.RowIndex < _parameters.Count)
            descriptionLabel.Text = _parameters[e.RowIndex].Description;
        else
            descriptionLabel.Text = string.Empty;
    }

    private void DataGridView_CellValidating(object sender, DataGridViewCellValidatingEventArgs e)
    {
        if (e.ColumnIndex == 2 && !float.TryParse(e.FormattedValue.ToString(), out float _))
        {
            dataGridView.Rows[e.RowIndex].Cells[0].ErrorText = "Invalid value";
            e.Cancel = true;
        }
    }

    private void DataGridView_CellEndEdit(object sender, DataGridViewCellEventArgs e)
    {
        dataGridView.Rows[e.RowIndex].Cells[0].ErrorText = string.Empty;
    }

    private void OkButton_Click(object sender, EventArgs e)
    {
        foreach (ParameterRow row in _parameterRows)
        {
            if (row.Default)
                row.Parameter.IsDefault = true;
            else
                row.Parameter.Value = row.Value;
        }
    }

    private void DataGridView_CurrentCellDirtyStateChanged(object sender, EventArgs e)
    {
        if (dataGridView.CurrentCell is DataGridViewCheckBoxCell || dataGridView.CurrentCell is DataGridViewComboBoxCell)
            dataGridView.CommitEdit(DataGridViewDataErrorContexts.Commit);
    }
}
