using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Windows.Forms;
using NHSE.Core;

namespace NHSE.WinForms;

public partial class BatchEditor : Form
{
    private readonly ItemMutator Mutator;
    private readonly ItemProcessor Processor;
    private readonly IReadOnlyList<Item> Items;
    private readonly Item item;
    private int currentFormat = -1;

    public BatchEditor(IReadOnlyList<Item> items, Item item)
    {
        InitializeComponent();
        Items = items;
        this.item = item;
        Mutator = new ItemMutator();
        Processor = new ItemProcessor(Mutator);

        CB_Format.Items.Clear();
        CB_Format.Items.Add("Any");
        foreach (Type t in Mutator.Reflect.Types)
            CB_Format.Items.Add(t.Name.ToLower());
        CB_Format.Items.Add("All");

        CB_Format.SelectedIndex = CB_Require.SelectedIndex = 0;
        toolTip1.SetToolTip(CB_Property, "Name");
        toolTip2.SetToolTip(L_PropType, "Type");
        toolTip3.SetToolTip(L_PropValue, "Value");
    }

    private void SysBotRAMEdit_FormClosing(object sender, FormClosingEventArgs e)
    {
    }

    private void B_Go_Click(object sender, EventArgs e)
    {
        RunBackgroundWorker();
    }

    private void B_Add_Click(object sender, EventArgs e)
    {
        if (CB_Property.SelectedIndex < 0)
        { WinFormsUtil.Alert("Invalid Property"); return; }

        var prefix = StringInstruction.Prefixes;
        string s = prefix[CB_Require.SelectedIndex] + CB_Property.Items[CB_Property.SelectedIndex]!.ToString() + StringInstruction.SplitInstruction;
        if (RTB_Instructions.Lines.Length != 0 && RTB_Instructions.Lines[^1].Length > 0)
            s = Environment.NewLine + s;

        RTB_Instructions.AppendText(s);
    }

    private void CB_Format_SelectedIndexChanged(object sender, EventArgs e)
    {
        if (currentFormat == CB_Format.SelectedIndex)
            return;

        int format = CB_Format.SelectedIndex;
        CB_Property.Items.Clear();
        CB_Property.Items.AddRange(Mutator.Reflect.Properties[format]);
        CB_Property.SelectedIndex = 0;
        currentFormat = format;
    }

    private void CB_Property_SelectedIndexChanged(object sender, EventArgs e)
    {
        L_PropType.Text = Mutator.GetPropertyType(CB_Property.Text, CB_Format.SelectedIndex);
        if (Mutator.TryGetHasProperty(item, CB_Property.Text, out var pi))
        {
            L_PropValue.Text = pi.GetValue(item)?.ToString();
            L_PropType.ForeColor = L_PropValue.ForeColor; // reset color
        }
        else // no property, flag
        {
            L_PropValue.Text = string.Empty;
            L_PropType.ForeColor = Color.Red;
        }
    }

    private void RunBackgroundWorker()
    {
        if (RTB_Instructions.Lines.Any(line => line.Length == 0))
        { WinFormsUtil.Error("Invalid instruction detected."); return; }

        var sets = StringInstructionSet.GetBatchSets(RTB_Instructions.Lines).ToArray();
        if (sets.Any(s => s.Filters.Any(z => string.IsNullOrWhiteSpace(z.PropertyValue))))
        { WinFormsUtil.Error("Filter empty."); return; }

        if (sets.Any(z => z.Instructions.Count == 0))
        { WinFormsUtil.Error("No instructions."); return; }

        var emptyVal = sets.SelectMany(s => s.Instructions.Where(z => string.IsNullOrWhiteSpace(z.PropertyValue))).ToArray();
        if (emptyVal.Length > 0)
        {
            string props = string.Join(", ", emptyVal.Select(z => z.PropertyName));
            string invalid = "Property empty." + Environment.NewLine + props;
            if (DialogResult.Yes != WinFormsUtil.Prompt(MessageBoxButtons.YesNo, invalid, "Continue?"))
                return;
        }

        RTB_Instructions.Enabled = B_Go.Enabled = false;
        RunBatchEdit(sets);
    }

    private void RunBatchEdit(StringInstructionSet[] sets)
    {
        bool finished = false, displayed = false; // hack cuz DoWork event isn't cleared after completion
        b.DoWork += (sender, e) =>
        {
            if (finished)
                return;
            // don't bother reporting progress...
            Processor.Process(sets, Items);
            finished = true;
        };

        b.ProgressChanged += (sender, e) => SetProgressBar(e.ProgressPercentage);
        b.RunWorkerCompleted += (sender, e) =>
        {
            string result = Processor.GetEditorResults(sets);
            if (!displayed) WinFormsUtil.Alert(result);
            displayed = true;
            RTB_Instructions.Enabled = B_Go.Enabled = true;
            SetupProgressBar(0);
        };
        b.RunWorkerAsync();
    }

    // Progress Bar
    private void SetupProgressBar(int count)
    {
        MethodInvoker mi = () => { PB_Show.Minimum = 0; PB_Show.Step = 1; PB_Show.Value = 0; PB_Show.Maximum = count; };
        if (PB_Show.InvokeRequired)
            PB_Show.Invoke(mi);
        else
            mi.Invoke();
    }

    private void SetProgressBar(int i)
    {
        if (PB_Show.InvokeRequired)
            PB_Show.Invoke((MethodInvoker)(() => PB_Show.Value = i));
        else
            PB_Show.Value = i;
    }
}