namespace FoodFactory.Recipes;

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using Arch.Core;
using Arch.Core.Extensions;
using Arch.Core.Extensions.Dangerous;
using FoodFactory.Items;
using FoodFactory.Math;
using Godot;

public abstract record Recipe(string Name, BlueprintId[]? BlueprintIds, bool[] RequireAll, Tags[] Inputs, Tags[] Exclude, RecipeOutput RecipeOutput, RecipeAction Action = default, bool InputsOrdered = true)
{
  public abstract bool CanProcess(in RecipeContext context);
  public abstract RecipeResult Process(in RecipeContext context, ref RecipeResultBuilder builder);
}
public readonly record struct RecipeOutput
{
  public int? Min { get; }
  public int? Max { get; }
  [MemberNotNullWhen(true, nameof(Min), nameof(Max))]
  public bool IsExact => Min.HasValue && Max.HasValue && Min == Max;
  [MemberNotNullWhen(true, nameof(Min), nameof(Max))]
  public bool IsRange => Min.HasValue && Max.HasValue && Min != Max;
  public bool IsUnbounded => Min == null && Max == null;

  public RecipeOutput(int exact)
  {
    Min = exact;
    Max = exact;
  }

  public RecipeOutput(int min, int max)
  {
    Min = min;
    Max = max;
  }
  private RecipeOutput(int? min, int? max)
  {
    Min = min;
    Max = max;
  }

  public static RecipeOutput Any => new(null, null);
}
public struct CompiledRecipe
{

  public Recipe RecipeRef;
  // public BlueprintId[] InputBlueprints;
  public ItemEntry[] ItemEntries;
  public bool IsOrdered;
}
public struct ItemEntry
{
  public bool RequireAll;
  public Tags InputTags;
  public Tags ExcludeTags;
  public BlueprintId? Blueprint;
}
public static class RecipeCompiler
{
  public static CompiledRecipe Compile(Recipe recipe) => new()
  {
    RecipeRef = recipe,
    ItemEntries = BuildEntries(recipe),
    // IsOrdered = recipe.InputsOrdered,
  };
  private static ItemEntry[] BuildEntries(Recipe recipe)
  {
    var entries = new ItemEntry[recipe.Inputs.Length];

    for (var i = 0; i < entries.Length; i++)
    {
      entries[i] = new ItemEntry
      {
        RequireAll = recipe.RequireAll[i],
        InputTags = recipe.Inputs[i],
        ExcludeTags = recipe.Exclude[i],
        // Blueprint = recipe.BlueprintIds?[i],
      };
    }

    return entries;
  }
}
public record BurnItemRecipe : Recipe
{
  public BurnItemRecipe() : base("Burn_item",
                                BlueprintIds: null,
                                RequireAll: [false],
                                Inputs: [new Tags("burnable")],
                                Exclude: [new Tags("burned")],
                                RecipeOutput: RecipeOutput.Any,
                                Action: new RecipeAction("cook"),
                                InputsOrdered: true)
  {

  }

  public override bool CanProcess(in RecipeContext context)
  {
    if (context.Items[0].TryGet<Temperature>(out var temp) && context.Items[0].TryGet<BurnableTemp>(out var burnableTemp) && temp > burnableTemp.Temperature)
    {
      return true;
    }
    return false;
  }
  public override RecipeResult Process(in RecipeContext context, ref RecipeResultBuilder builder) => new(BurnItem);

  private void BurnItem(RecipeContext context)
  {
    // context.Entity[0].Remove<BurnableTemp>();
    context.Items[0].Add(new BurnedItem(context.Items[0].Get<Temperature>(), "Was Burned as some time thing"));
    context.Items[0].Set(context.Items[0].Get<Tags>().WithOut("burnable").With("burned"));
    context.Items[0].Set($"Burned_{context.Items[0].Get<Name>().Value}");
    if (context.Items[0].Has<Color>())
    {
      context.Items[0].Set(context.Items[0].Get<Color>() * Colors.Black);
    }
    else
    {
      context.Items[0].Add(Colors.Black);
    }
  }
}
public record OnionSliceRecipe() : Recipe(Name: "Onion_Slice",
                                          BlueprintIds: null,
                                          RequireAll: [false],
                                          Inputs: [new Tags("onion", "sliceable")],
                                          Exclude: [new Tags()],
                                          Action: "slice",
                                          RecipeOutput: new RecipeOutput(2)
                                          )
{
  public override bool CanProcess(in RecipeContext context) => true;

  public override RecipeResult Process(in RecipeContext context, ref RecipeResultBuilder builder)
  {
    builder.AddRemove(true);
    builder.AddCreate(Slice);
    builder.AddCreate(Slice);
    return builder.Build();
  }
  private Entity Slice(in RecipeContext context)
  {
    Span<Entity> span = stackalloc Entity[1];
    var signature = context.World.GetSignature(context.Items[0]);
    context.World.Create(span, signature, 1);
    PotatoCookRecipe.CopyEntities(context.Items, span, context.World);
    span[0].Set(new Name("Sliced " + context.Items[0].Get<Name>().Value));
    span[0].Set(new Mass(context.Items[0].Get<Mass>().Value * .5));
    span[0].Set(span[0].Get<Tags>().With("sliced"));
    return span[0];
  }
}
public record PotatoCookRecipe() : Recipe(Name: "Potato_Cook",
                                          BlueprintIds: null,
                                          RequireAll: [false],
                                          Inputs: [new Tags("potato", "raw")],
                                          Exclude: [new Tags()],
                                          InputsOrdered: true,
                                          Action: "cook",
                                          RecipeOutput: new RecipeOutput(1))
{
  public override bool CanProcess(in RecipeContext context)
  {
    if (!(context.Items[0].TryGet<Temperature>(out var temp) && temp.Fahrenheit > 350))
    {
      return false;
    }
    return true;
  }

  public override RecipeResult Process(in RecipeContext context, ref RecipeResultBuilder builder)
  {
    builder.AddRemove(true);
    builder.AddCreate(NewPotato);
    return builder.Build();
  }
  private Entity NewPotato(in RecipeContext context)
  {
    Span<Entity> span = stackalloc Entity[1];
    var signature = context.World.GetSignature(context.Items[0]);
    context.World.Create(span, signature, 1);
    CopyEntity(context.Items[0], span[0], context.World);

    span[0].Set(new Name("Cooked_Potato"));
    span[0].Set(context.Items[0].Get<Tags>().With("cooked").WithOut("raw"));
    // span[0].Set(context.Entity[0].Get<Temperature>());
    if (context.Items[0].Has<Color>())
    {
      context.Items[0].Set(context.Items[0].Get<Color>() * Colors.Brown);
    }
    else
    {
      context.Items[0].Add(Colors.Brown);
    }
    return span[0];
  }
  public static void CopyEntities(Span<Entity> from, Span<Entity> to, World world)
  {
    Debug.Assert(from.Length == to.Length);
    for (int i = 0; i < from.Length; i++)
    {
      CopyEntity(from[i], to[i], world);
    }

  }
  public static void CopyEntity(Entity src, Entity dst, World world)
{
    var srcData = world.GetEntityData(src);
    var dstData = world.GetEntityData(dst);

    var components = srcData.Archetype
        .GetChunk(srcData.Slot.ChunkIndex)
        .Components;
    var componentsDst = dstData.Archetype
        .GetChunk(dstData.Slot.ChunkIndex)
        .Components;

    int srcIndex = srcData.Slot.Index;
    int dstIndex = dstData.Slot.Index;

    for (int i = 0; i < components.Length; i++)
    {
      componentsDst[i].SetValue(components[i].GetValue(srcIndex), dstIndex);
    }
}
}