using System.Windows.Forms;
using System.Xml;
using LiveSplit.TZA.Splits;

namespace LiveSplit.TZA;

public partial class TzaControl : UserControl {
    internal Dictionary<uint, int> EnabledSplits { get; } = new();
    private Dictionary<uint, TreeNode> CheckBoxes { get; } = new();
    private bool _updating;

    public TzaControl() {
        this.InitializeComponent();
        this.SuspendLayout();
        this.Dock = DockStyle.Fill;

        this.splitsPanel.AfterCheck += (_, args) => {
            if (this._updating) {
                return;
            }

            var isChecked = args.Node.Checked;
            if (args.Node.Tag is SplitInfo info) {
                // this is a parent node
                if (isChecked) {
                    this.EnabledSplits[info.Id] = 0;
                } else {
                    this.EnabledSplits.Remove(info.Id);
                }
            } else if (args.Node.Tag is int idx && args.Node.Parent.Tag is SplitInfo parentInfo) {
                // this is a child node
                if (isChecked) {
                    this.EnabledSplits[parentInfo.Id] = idx;
                } else {
                    this.EnabledSplits.Remove(parentInfo.Id);
                }
            }

            this.UpdateCheckboxState();
        };

        foreach (var info in SplitLogic.Splits) {
            var node = new TreeNode($"({info.Splits.Length}) {info.Name}") {
                Tag = info,
                Checked = this.EnabledSplits.ContainsKey(info.Id),
            };

            for (var i = 0; i < info.Splits.Length; i++) {
                var split = info.Splits[i];
                node.Nodes.Add(new TreeNode(split.GetHumanName()) {
                    Tag = i,
                    Checked = this.EnabledSplits.TryGetValue(info.Id, out var idx) && idx == i,
                });
            }

            this.CheckBoxes[info.Id] = node;
            this.splitsPanel.Nodes.Add(node);
        }

        this.ResumeLayout(false);
        this.PerformLayout();
    }

    internal XmlNode GetSettings(XmlDocument doc) {
        var node = doc.CreateElement("Settings");

        var enabledSplits = doc.CreateElement("EnabledSplits");
        foreach (var entry in this.EnabledSplits) {
            var elem = doc.CreateElement("Split");
            elem.InnerText = (entry.Key * 1_000 + entry.Value).ToString();
            enabledSplits.AppendChild(elem);
        }

        node.AppendChild(enabledSplits);

        return node;
    }

    internal void SetSettings(XmlNode node) {
        if (node is not XmlElement settings) {
            return;
        }

        this.EnabledSplits.Clear();

        if (settings["EnabledSplits"] is { } enabledSplits) {
            foreach (var split in enabledSplits.ChildNodes) {
                if (split is not XmlElement splitElem) {
                    continue;
                }

                if (uint.TryParse(splitElem.InnerText.Trim(), out var id)) {
                    var idx = id % 1_000;
                    this.EnabledSplits[id / 1_000] = (int) idx;
                }
            }
        }

        this.UpdateCheckboxState();
    }

    private void UpdateCheckboxState() {
        this._updating = true;
        
        foreach (var entry in this.CheckBoxes) {
            entry.Value.Checked = this.EnabledSplits.ContainsKey(entry.Key);

            foreach (var node in entry.Value.Nodes) {
                if (node is TreeNode child) {
                    child.Checked = this.EnabledSplits.TryGetValue(entry.Key, out var idx) && idx == (int) child.Tag;
                }
            }
        }

        this._updating = false;
    }
}