using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Forms;
using PKHeX.Core;

namespace PKHeX.WinForms;

public partial class SuperTrainingEditor : Form
{
    public SuperTrainingEditor(PKM pk)
    {
        Entity = (ISuperTrain)pk;
        InitializeComponent();
        WinFormsUtil.TranslateInterface(this, Main.CurrentLanguage);
        int vertScrollWidth = SystemInformation.VerticalScrollBarWidth;
        TLP_SuperTrain.Padding = TLP_DistSuperTrain.Padding = new Padding(0, 0, vertScrollWidth, 0);

        // Updating a Control display with auto-sized elements on every row addition is cpu intensive. Disable layout updates while populating.
        TLP_SuperTrain.SuspendLayout();
        TLP_DistSuperTrain.SuspendLayout();
        TLP_SuperTrain.Scroll += WinFormsUtil.PanelScroll;
        TLP_DistSuperTrain.Scroll += WinFormsUtil.PanelScroll;
        PopulateRegimens("SuperTrain", TLP_SuperTrain, reglist);
        PopulateRegimens("DistSuperTrain", TLP_DistSuperTrain, distlist);
        WinFormsUtil.TranslateInterface(this, Main.CurrentLanguage);
        TLP_SuperTrain.ResumeLayout();
        TLP_DistSuperTrain.ResumeLayout();

        CHK_SecretUnlocked.Checked = Entity.SecretSuperTrainingUnlocked;
        CHK_SecretComplete.Checked = Entity.SecretSuperTrainingComplete;

        if (pk is PK6 pk6)
        {
            CB_Bag.Items.Clear();
            CB_Bag.Items.Add("---");
            for (int i = 1; i < GameInfo.Strings.trainingbags.Length - 1; i++)
                CB_Bag.Items.Add(GameInfo.Strings.trainingbags[i]);

            CB_Bag.SelectedIndex = pk6.TrainingBag;
            NUD_BagHits.Value = pk6.TrainingBagHits;

            if (!CHK_SecretUnlocked.Checked) // force update to disable checkboxes
                CHK_Secret_CheckedChanged(this, EventArgs.Empty);
        }
        else
        {
            L_Bag.Visible = CB_Bag.Visible = L_Hits.Visible = NUD_BagHits.Visible = false;
            CHK_SecretUnlocked.Visible = CHK_SecretComplete.Visible = false;
        }
    }

    private readonly List<RegimenInfo> reglist = new();
    private readonly List<RegimenInfo> distlist = new();
    private readonly ISuperTrain Entity;
    private const string PrefixCHK = "CHK_";

    private void B_Cancel_Click(object sender, EventArgs e) => Close();

    private void B_Save_Click(object sender, EventArgs e)
    {
        Save();
        Close();
    }

    private void PopulateRegimens(string propertyPrefix, TableLayoutPanel TLP, List<RegimenInfo> list)
    {
        // Get a list of all Regimen Attregutes in the PKM
        list.AddRange(GetBooleanRegimenNames(Entity, propertyPrefix));
        TLP.ColumnCount = 1;
        TLP.RowCount = 0;

        // Add Regimens
        foreach (var reg in list)
            AddRegimenChoice(reg, TLP);

        // Force auto-size
        foreach (var style in TLP.RowStyles.OfType<RowStyle>())
            style.SizeType = SizeType.AutoSize;
        foreach (var style in TLP.ColumnStyles.OfType<ColumnStyle>())
            style.SizeType = SizeType.AutoSize;
    }

    private static IEnumerable<RegimenInfo> GetBooleanRegimenNames(ISuperTrain pk, string propertyPrefix)
    {
        var names = ReflectUtil.GetPropertiesStartWithPrefix(pk.GetType(), propertyPrefix);
        foreach (var name in names)
        {
            var value = ReflectUtil.GetValue(pk, name);
            if (value is bool state)
                yield return new RegimenInfo(name, state);
        }
    }

    private static void AddRegimenChoice(RegimenInfo reg, TableLayoutPanel TLP)
    {
        // Get row we add to
        int row = TLP.RowCount;
        TLP.RowCount++;

        var chk = new CheckBox
        {
            Anchor = AnchorStyles.Left,
            Name = PrefixCHK + reg.Name,
            Margin = new Padding(2),
            Text = reg.Name,
            AutoSize = true,
            Padding = Padding.Empty,
        };
        chk.CheckedChanged += (sender, e) => reg.CompletedRegimen = chk.Checked;
        chk.Checked = reg.CompletedRegimen;
        TLP.Controls.Add(chk, 0, row);
    }

    private void Save()
    {
        foreach (var reg in reglist)
            ReflectUtil.SetValue(Entity, reg.Name, reg.CompletedRegimen);
        foreach (var reg in distlist)
            ReflectUtil.SetValue(Entity, reg.Name, reg.CompletedRegimen);

        if (Entity is PK6 pk6)
        {
            pk6.SecretSuperTrainingUnlocked = CHK_SecretUnlocked.Checked;
            pk6.SecretSuperTrainingComplete = CHK_SecretComplete.Checked;
            pk6.TrainingBag = CB_Bag.SelectedIndex;
            pk6.TrainingBagHits = (int)NUD_BagHits.Value;
        }
        else // clear flags if manually cleared
        {
            Entity.SecretSuperTrainingUnlocked &= CHK_SecretUnlocked.Checked;
            Entity.SecretSuperTrainingComplete &= CHK_SecretComplete.Checked;
        }
    }

    private sealed class RegimenInfo
    {
        public readonly string Name;
        public bool CompletedRegimen;

        internal RegimenInfo(string name, bool completedRegimen)
        {
            Name = name;
            CompletedRegimen = completedRegimen;
        }
    }

    private void B_All_Click(object sender, EventArgs e)
    {
        if (CHK_SecretUnlocked.Checked) // only give dist if Secret is Unlocked (None -> All -> All*)
        {
            foreach (var c in TLP_DistSuperTrain.Controls.OfType<CheckBox>())
                c.Checked = true;
        }

        if (Entity is PK6)
        {
            CHK_SecretUnlocked.Checked = true;
            CHK_SecretComplete.Checked = true;
        }
        foreach (var c in TLP_SuperTrain.Controls.OfType<CheckBox>())
            c.Checked = true;
    }

    private void B_None_Click(object sender, EventArgs e)
    {
        CHK_SecretUnlocked.Checked = false;
        CHK_SecretComplete.Checked = false;
        foreach (var c in TLP_SuperTrain.Controls.OfType<CheckBox>())
            c.Checked = false;
        foreach (var c in TLP_DistSuperTrain.Controls.OfType<CheckBox>())
            c.Checked = false;
    }

    private void CHK_Secret_CheckedChanged(object sender, EventArgs e)
    {
        if (Entity is not PK6)
            return;
        CHK_SecretComplete.Checked &= CHK_SecretUnlocked.Checked;
        CHK_SecretComplete.Enabled = CHK_SecretUnlocked.Checked;
        foreach (var c in TLP_SuperTrain.Controls.OfType<CheckBox>().Where(chk => Convert.ToInt16(chk.Name[14] + "") >= 4))
        {
            c.Enabled = CHK_SecretUnlocked.Checked;
            if (!CHK_SecretUnlocked.Checked)
                c.Checked = false;
        }
    }
}