///
/// Copyright (c) 2013-2017 Sensus Metering Systems
///
using System;
using System.Collections.Generic;
using System.Windows.Forms;
using Config.Entities;
using TBF.Resources;

namespace TBF.TestWizard
{
	public partial class FlowSelection : Form
	{
        enum QSpec
        {
            Qfrom_Qto,
            Q_dQ,
            Q_dPct,
        }

        Test test;
		IList<MetersPath> sensorPaths;
        QSpec qSpec;

		public FlowSelection()
		{
			InitializeComponent();

            qSpec = 0;

            Text = Strings.Flow_selection;
            qFromLabel.Text = Strings.Q_from_m3h;
            qToLabel.Text = Strings.Q_to_m3h;
            sensorsLabel.Text = Strings.Sensors;
        }

		public FlowSelection(bool first, bool last,
							 Test test,
							 IList<MetersPath> sensorPaths)
			: this()
		{
			this.test = test;
			this.sensorPaths = sensorPaths;

            if (first) backButton.Visible = false;

            backButton.Text = Strings.BackBtnText;
            nextButton.Text = last ? Strings.FinishBtnText : Strings.NextBtnText;
			cancelButton.Text = Strings.CancelBtnText;
		}

		private void FlowSelection_Load(object sender, EventArgs e)
		{
			if (test == null) return;

			foreach (var path in sensorPaths) sensorsComboBox.Items.Add(path.Name);

			qFromTextBox.Text = test.Qfrom.ToString();
			qToTextBox.Text = test.Qto.ToString();
			nextButton.Enabled = IsFormValid();
		}

		void UpdateTest()
		{
            double Q, dQ;
            switch (qSpec)
            {
                default:
                case QSpec.Qfrom_Qto:
                    test.Qfrom = (float)Utils.ParseUDouble(qFromTextBox.Text);
                    test.Qto = (float)Utils.ParseUDouble(qToTextBox.Text);
                    break;

                case QSpec.Q_dQ:
                    Q = Utils.ParseUDouble(q2TextBox.Text);
                    dQ = Utils.ParseUDouble(dQTextBox.Text);
                    test.Qfrom = (float)(Q - dQ);
                    test.Qto = (float)(Q + dQ);
                    break;

                case QSpec.Q_dPct:
                    Q = Utils.ParseUDouble(q3TextBox.Text);
                    dQ = Utils.ParseUDouble(dQpctTextBox.Text);
                    test.Qfrom = (float)(Q * (1 - dQ / 100.0f));
                    test.Qto = (float)(Q * (1 + dQ / 100.0f));
                    break;
            }

			if (sensorsComboBox.Items.Contains(sensorsComboBox.Text))
			{
				test.MetersPath = sensorsComboBox.Text;
			}
		}

		bool IsFormValid()
		{
			float dummy;
            switch (qSpec)
            {
                default:
                case QSpec.Qfrom_Qto:
                    return Utils.TryParseUFloat(qFromTextBox.Text, out dummy) &&
                           Utils.TryParseUFloat(qToTextBox.Text, out dummy) &&
                           sensorsComboBox.Items.Contains(sensorsComboBox.Text);

                case QSpec.Q_dQ:
                    return Utils.TryParseUFloat(q2TextBox.Text, out dummy) &&
                           Utils.TryParseUFloat(dQTextBox.Text, out dummy) &&
                           sensorsComboBox.Items.Contains(sensorsComboBox.Text);

                case QSpec.Q_dPct:
                    return Utils.TryParseUFloat(q3TextBox.Text, out dummy) &&
                           Utils.TryParseUFloat(dQpctTextBox.Text, out dummy) &&
                           sensorsComboBox.Items.Contains(sensorsComboBox.Text);
            }
		}

		private void backButton_Click(object sender, EventArgs e)
		{
			DialogResult = DialogResult.Retry;
			Close();
		}

		private void nextButton_Click(object sender, EventArgs e)
		{
			if (test != null && IsFormValid())
			{
				UpdateTest();
				DialogResult = DialogResult.OK;
				Close();
			}
			else
			{
				DialogResult = DialogResult.None;
			}
		}

		private void cancelButton_Click(object sender, EventArgs e)
		{
			DialogResult = DialogResult.Cancel;
			Close();
		}

		private void anyTextBox_TextChanged(object sender, EventArgs e)
		{
			nextButton.Enabled = IsFormValid();
		}

        private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)
        {
            double Q1,Q2;

            switch ((QSpec)tabControl1.SelectedIndex)
            {
                default:
                case QSpec.Qfrom_Qto:
                    if (qSpec == QSpec.Q_dQ &&
                        Utils.TryParseUDouble(q2TextBox.Text, out Q1) &&
                        Utils.TryParseUDouble(dQTextBox.Text, out Q2))
                    {
                        qFromTextBox.Text = (Q1 - Q2).ToString();
                        qToTextBox.Text = (Q1 + Q2).ToString();
                    }
                    else if (qSpec == QSpec.Q_dPct &&
                             Utils.TryParseUDouble(q3TextBox.Text, out Q1) &&
                             Utils.TryParseUDouble(dQpctTextBox.Text, out Q2))
                    {
                        qFromTextBox.Text = (Q1 * (1 - Q2 / 100.0)).ToString();
                        qToTextBox.Text = (Q1 * (1 + Q2 / 100.0)).ToString();
                    }

                    qSpec = QSpec.Qfrom_Qto;
                    break;

                case QSpec.Q_dQ:
                    if (qSpec == QSpec.Qfrom_Qto &&
                        Utils.TryParseUDouble(qFromTextBox.Text, out Q1) &&
                        Utils.TryParseUDouble(qToTextBox.Text, out Q2))
                    {
                        q2TextBox.Text = ((Q1 + Q2) / 2.0).ToString();
                        dQTextBox.Text = ((Q2 - Q1) / 2.0).ToString();
                    }
                    else if (qSpec == QSpec.Q_dPct &&
                             Utils.TryParseUDouble(q3TextBox.Text, out Q1) &&
                             Utils.TryParseUDouble(dQpctTextBox.Text, out Q2))
                    {
                        q2TextBox.Text = q3TextBox.Text;
                        dQTextBox.Text = (Q1 * Q2 / 100.0).ToString();
                    }

                    qSpec = QSpec.Q_dQ;
                    break;
                
                case QSpec.Q_dPct:
                    if (qSpec == QSpec.Qfrom_Qto &&
                        Utils.TryParseUDouble(qFromTextBox.Text, out Q1) &&
                        Utils.TryParseUDouble(qToTextBox.Text, out Q2))
                    {
                        q3TextBox.Text = ((Q1 + Q2) / 2.0).ToString();
                        dQpctTextBox.Text = (Q1 + Q2 != 0) ? (100.0 * (Q2 - Q1) / (Q1 + Q2)).ToString() : string.Empty;
                    }
                    else if (qSpec == QSpec.Q_dQ &&
                             Utils.TryParseUDouble(q2TextBox.Text, out Q1) &&
                             Utils.TryParseUDouble(dQTextBox.Text, out Q2) &&
                             Q1 != 0)
                    {
                        q3TextBox.Text = q2TextBox.Text;
                        dQpctTextBox.Text = (Q1 != 0) ? (100.0 * Q2 / Q1).ToString() : string.Empty;
                    }

                    qSpec = QSpec.Q_dPct;
                    break;
            }

            nextButton.Enabled = IsFormValid();
        }
	}
}