using System.Text;
using Godot;
using openF1Manager.scripts;

namespace openF1Manager.scenes.Main;

public partial class SessionTool : MarginContainer
{
    private LineEdit _meetingKey;
    private LineEdit _sessionKey;
    private LineEdit _location;
    private LineEdit _dateStart;
    private LineEdit _dateEnd;

    private string _baseAddress = "https://api.openf1.org/v1/sessions?";

    // MVVM-lite
    private SessionFilter _vm;
    private FormBinder<SessionFilter> _binder;
    
    public override void _Ready()
    {
        _meetingKey =
            GetNode<LineEdit>(
                "ElementsVBoxContainer/PropertiesVBoxContainer/MeetingKeyHBoxContainer/MeetingKeyLineEdit");
        _sessionKey =
            GetNode<LineEdit>(
                "ElementsVBoxContainer/PropertiesVBoxContainer/SessionKeyHBoxContainer/SessionKeyLineEdit");
        _location = GetNode<LineEdit>(
            "ElementsVBoxContainer/PropertiesVBoxContainer/LocationHBoxContainer/LocationLineEdit");
        _dateStart =
            GetNode<LineEdit>("ElementsVBoxContainer/PropertiesVBoxContainer/DateStartHBoxContainer/DateStartLineEdit");
        _dateEnd = GetNode<LineEdit>(
            "ElementsVBoxContainer/PropertiesVBoxContainer/DateEndHBoxContainer/DateEndLineEdit");

        GD.Print(_meetingKey.PlaceholderText);
        
        // Create VM and bind all LineEdits under the form root
        _vm = new SessionFilter();
        var formRoot = GetNode<Control>("ElementsVBoxContainer/PropertiesVBoxContainer");
        _binder = new FormBinder<SessionFilter>(_vm, this).Bind();
    }


    public string BuildQueryOld()
    {
        GD.Print("Building query");
        var queryString = System.Web.HttpUtility.ParseQueryString(string.Empty);

        foreach (var pair in new (string Key, string Value)[]
                 {
                     ("meeting_key", _meetingKey.Text),
                     ("session_key", _sessionKey.Text),
                     ("location", _location.Text),
                     ("date_start", _dateStart.Text),
                     ("date_end", _dateEnd.Text),
                 })
        {
            if (!string.IsNullOrWhiteSpace(pair.Value))
                queryString[pair.Key] = pair.Value;
        }

        return _baseAddress + queryString.ToString();
    }

    public string BuildQuery()
    {
        GD.Print("Building query");
        return ApiModelSerializer.ToQueryString(_vm, _baseAddress);
    }

    public async void SendRequest()
    {
        string requestAddress = BuildQuery();
        GD.Print(requestAddress);
        var httpRequest = GetParent().GetParent().GetNode<HttpRequest>("HTTPRequest");
        httpRequest.RequestCompleted += OnSessionRequestCompleted;

        GD.Print("Sending request");
        var error = httpRequest.Request(requestAddress);
        
        if (error != Error.Ok)
        {
            GD.Print(error);
            return;
        }
    }

    private void OnSessionRequestCompleted(long result, long responseCode, string[] headers, byte[] body)
    {
        GD.Print("Request completed");
        var text = Encoding.UTF8.GetString(body);
        var parsed = Json.ParseString(text);

        if (parsed.VariantType != Variant.Type.Array)
        {
            GD.PrintErr("Unexpected JSON format. Expected array.");
            return;
        }

        var arr = parsed.AsGodotArray();
        if (arr.Count == 0)
        {
            GD.Print("No sessions returned.");
            return;
        }
        
        // Populate List of sessions
        ItemList itemList = GetNode<ItemList>("ElementsVBoxContainer/ControlsVBoxContainer/ItemList");
        itemList.Clear();

        int count = 0;
        foreach (var item in arr)
        {
            count++;
            itemList.AddItem(count.ToString());
        }
        
        // Populate UI fields from first item in array
        var first = arr[0];
        if (first.VariantType != Variant.Type.Dictionary)
        {
            GD.PrintErr("Unexpected item format. Expected dictionary.");
            return;
        }

        var dict = first.AsGodotDictionary();
        
        // Populate VM; binder reflects it to UI fields
        ApiModelSerializer.PopulateFromDictionary(_vm, dict);
    }
    
    private void PopulateFieldsFromDictionary(Godot.Collections.Dictionary dict)
    {
        // Helper to read a value with multiple possible key casings
        string GetString(params string[] keys)
        {
            foreach (var k in keys)
            {
                if (dict.ContainsKey(k) && dict[k].VariantType != Variant.Type.Nil)
                    return dict[k].ToString();
            }
            return string.Empty;
        }

        // Map likely API keys; try snake_case first, then camelCase fallbacks
        _meetingKey.Text = GetString("meeting_key", "meetingKey");
        _sessionKey.Text = GetString("session_key", "sessionKey");
        _location.Text   = GetString("location", "Location");
        _dateStart.Text  = GetString("date_start", "dateStart", "DateStart");
        _dateEnd.Text    = GetString("date_end", "dateEnd", "DateEnd");
    }

}