using System;
using System.Collections.Generic;
using System.IO;
using Jint;
using Jint.Native;
using Jint.Native.Object;
using ln.templates.html;

namespace ln.templates;


public class Context : IDisposable
{
    public Context(ITemplateResolver resolver, IEnumerable<KeyValuePair<string, object>> scriptObjects, TextWriter targetWriter)
    {
        Resolver = resolver;
        Engine = new Engine();
        foreach (KeyValuePair<string,object> pair in scriptObjects)
            Engine.SetValue(pair.Key, pair.Value);
        TargetWriter = targetWriter;
    }
    public Context(ITemplateResolver resolver, Engine engine, TextWriter targetWriter)
    {
        Resolver = resolver;
        Engine = engine;
        TargetWriter = targetWriter;
    }
    public Context(Context source)
    {
        Resolver = source.Resolver;
        Engine = source.Engine;
        TargetWriter = source.TargetWriter;
    }

    public Context(ITemplateResolver resolver, TextWriter targetWriter)
        : this(resolver, new Engine(), targetWriter){}

    public Engine Engine { get; private set; }
    public ITemplateResolver Resolver { get; }
    
    public TextWriter TargetWriter { get; }

    /**
     * Slots to be used for v-include and v-frame
     */
    private Dictionary<string, Element> _slots = new Dictionary<string, Element>();
    public bool TryGetSlot(string slotName, out Element slot) => _slots.TryGetValue(slotName, out slot);
    public void SetSlot(string slotName, Element slot) => _slots[slotName] = slot;
    public void ClearSlot(string slotName) => _slots.Remove(slotName);
    public void ClearSlots() => _slots.Clear();

    public void SetSlots(IEnumerable<KeyValuePair<string, Element>> slots)
    {
        _slots.Clear();
        foreach (var pair in slots)
            _slots.Add(pair.Key, pair.Value);
    }

    public void AssignGlobals(ObjectInstance o)
    {
        foreach (var key in o.GetOwnPropertyKeys())
            Engine.Realm.GlobalObject.Set(key, o.Get(key));
    }

    public void Dispose()
    {
    }
}