using System.Runtime.CompilerServices;
using PkmnLib.Dynamic.Models;
using PkmnLib.Static;

namespace PkmnLib.Dynamic.ScriptHandling;

/// <summary>
/// Helper functions for script execution.
/// </summary>
public static class ScriptExecution
{
    /// <summary>
    /// Executes a hook on all scripts in a source.
    /// </summary>
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    public static void RunScriptHook(this IScriptSource source, Action<Script> hook)
    {
        var iterator = source.GetScripts();
        foreach (var container in iterator)
        {
            if (container.IsEmpty)
                continue;
            var script = container.Script;
            if (script.IsSuppressed)
                continue;
            hook(script);
        }
    }

    /// <summary>
    /// Executes a hook on all scripts in a list of sources. Note that this does not walk through the parents of the
    /// sources, but only the sources themselves.
    /// </summary>
    public static void RunScriptHook(this IReadOnlyList<IEnumerable<ScriptContainer>> source, Action<Script> hook)
    {
        foreach (var container in source.SelectMany(x => x))
        {
            if (container.IsEmpty)
                continue;
            var script = container.Script;
            if (script.IsSuppressed)
                continue;
            hook(script);
        }
    }

    public static void RunItemScript(this IItem item, ScriptResolver scriptResolver, IPokemon? target)
    {
        if (!scriptResolver.TryResolveBattleItemScript(item, out var itemScript))
        {
            return;
        }
        if (!itemScript.IsItemUsable)
            return;

        itemScript.OnInitialize(item.BattleEffect!.Parameters);
        var requiresTarget = itemScript.RequiresTarget;
        if (requiresTarget)
        {
            if (target == null)
                throw new ArgumentNullException(nameof(target), "Item script requires a target.");
            itemScript.OnUseWithTarget(target);
        }
        else
        {
            itemScript.OnUse();
        }
    }
}