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

namespace TBF.TestWizard
{
	public partial class VolumeAndErrorSelection : Form
	{
        enum TabId
        {
            WaterMeterTab,
            HeatMeterTab,
        }

        Test test;
        TabId tabId;

		public VolumeAndErrorSelection()
		{
			InitializeComponent();

            tabId = 0;

            Text = Strings.Volume_and_error_selection;
            volumeLabel.Text = Strings.Volume + " [l]";
            durationLabel.Text = Strings.Duration_s;
            errLoPctLabel.Text = Strings.Err_limit_neg_pct_chdr;
            errHiPctLabel.Text = Strings.Err_limit_pos_pct_chdr;
            uncertaintyLabel.Text = Strings.Uncertainty_pct_chdr;
            backButton.Text = Strings.BackBtnText;
            nextButton.Text = Strings.FinishBtnText;
            cancelButton.Text = Strings.CancelBtnText;
            tabPage1.Text = Strings.Water_Meter;
            tabPage2.Text = Strings.Heat_meter;
            classLabel.Text = Strings.Metrological_class;
            qpLabel.Text = "Qp [m3/h]";
        }

		public VolumeAndErrorSelection(bool first, bool last, Test test)
			: this()
		{
			this.test = test;

			if (first) backButton.Visible = false;
			if (last) nextButton.Text = Strings.FinishBtnText;
		}

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

			volumeTextBox.Text = test.Volume.ToString();
			durationTextBox.Text = test.TstTime.ToString();
			errLoPctTextBox.Text = test.ErrLimLo.ToString();
			errHiPctTextBox.Text = test.ErrLimHi.ToString();
			uncertaintyTextBox.Text = test.Uncertainty.ToString();
            classComboBox.Text = "2";

			nextButton.Enabled = IsFormValid();
		}

		bool IsFormValid()
		{
            int idummy;
			float dummy;

            bool tabsValid;
            switch (tabId)
            {
                default:
                case TabId.WaterMeterTab:
                    tabsValid = Utils.TryParseSFloat(errLoPctTextBox.Text, out dummy)
                             && Utils.TryParseSFloat(errHiPctTextBox.Text, out dummy);
                    break;
                case TabId.HeatMeterTab:
                    tabsValid = int.TryParse(classComboBox.Text, out idummy)
                             && idummy >= 1 && idummy <= 3
                             && Utils.TryParseUFloat(qpTextBox.Text, out dummy);
                    break;
            }
            
            /// Return complete result
			return tabsValid && Utils.TryParseUFloat(volumeTextBox.Text, out dummy)
            				 && Utils.TryParseUFloat(durationTextBox.Text, out dummy)
				             && Utils.TryParseUFloat(uncertaintyTextBox.Text, out dummy);
		}

		void UpdateTest()
		{
			test.Volume   = Utils.ParseUFloat(volumeTextBox.Text);
			test.TstTime  = Utils.ParseUFloat(durationTextBox.Text);
            test.Uncertainty = Utils.ParseUFloat(uncertaintyTextBox.Text);

            switch (tabId)
            {
                default:
                case TabId.WaterMeterTab:
                    test.ErrLimLo = Utils.ParseSFloat(errLoPctTextBox.Text);
                    test.ErrLimHi = Utils.ParseSFloat(errHiPctTextBox.Text);
                    break;
                case TabId.HeatMeterTab:
                    test.ErrLimLo = (float)int.Parse(classComboBox.Text);
                    test.ErrLimHi = -Utils.ParseUFloat(qpTextBox.Text);
                    break;
            }
		}

		private void backButton_Click(object sender, EventArgs e)
		{
			if (test != null && IsFormValid()) UpdateTest();
			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 volumeTextBox_TextChanged(object sender, EventArgs e)
		{
			float Qave_lps = (test.Qfrom + test.Qto) / 7.2f;
			float volume;
			if (Utils.TryParseUFloat(volumeTextBox.Text, out volume))
			{
				durationTextBox.TextChanged -= new System.EventHandler(this.durationTextBox_TextChanged);
				durationTextBox.Text = (volume / Qave_lps).ToString();
				durationTextBox.TextChanged += new System.EventHandler(this.durationTextBox_TextChanged);
			}
			anyTextBox_TextChanged(sender, e);
		}

		private void durationTextBox_TextChanged(object sender, EventArgs e)
		{
			float Qave_lps = (test.Qfrom + test.Qto) / 7.2f;
			float testTime;
			if (Utils.TryParseUFloat(durationTextBox.Text, out testTime))
			{
				volumeTextBox.TextChanged -= new System.EventHandler(this.volumeTextBox_TextChanged);
				volumeTextBox.Text = (testTime * Qave_lps).ToString();
				volumeTextBox.TextChanged += new System.EventHandler(this.volumeTextBox_TextChanged);
			}
			anyTextBox_TextChanged(sender, e);
		}

        private void tabControl1_SelectedIndexChanged(object sender, EventArgs e)
        {
            switch ((TabId)tabControl1.SelectedIndex)
            {
                default:
                case TabId.WaterMeterTab:
                    tabId = TabId.WaterMeterTab;
                    break;

                case TabId.HeatMeterTab:
                    tabId = TabId.HeatMeterTab;
                    break;
            }

            nextButton.Enabled = IsFormValid();
        }
	}
}