craftdef.h

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// Luanti
// SPDX-License-Identifier: LGPL-2.1-or-later
// Copyright (C) 2013 celeron55, Perttu Ahola <celeron55@gmail.com>
 
#pragma once
 
#include "gamedef.h"
 
#include <string>
#include <vector>
 
struct ItemStack;
 
/*
        Crafting methods.
 
        The crafting method depends on the inventory list
        that the crafting input comes from.
*/
enum CraftMethod
{
        // Crafting grid
        CRAFT_METHOD_NORMAL,
        // Cooking something in a furnace
        CRAFT_METHOD_COOKING,
        // Using something as fuel for a furnace
        CRAFT_METHOD_FUEL,
};
 
/*
        The type a hash can be. The earlier a type is mentioned in this enum,
        the earlier it is tried at crafting, and the less likely is a collision.
        Changing order causes changes in behavior, so know what you do.
 */
enum CraftHashType
{
        // Hashes the normalized names of the recipe's elements.
        // Only recipes without group usage can be found here,
        // because groups can't be guessed efficiently.
        CRAFT_HASH_TYPE_ITEM_NAMES,
 
        // Counts the non-empty slots.
        CRAFT_HASH_TYPE_COUNT,
 
        // This layer both spares an extra variable, and helps to retain (albeit rarely used) functionality. Maps to 0.
        // Before hashes are "initialized", all hashes reside here, after initialisation, none are.
        CRAFT_HASH_TYPE_UNHASHED
 
};
const int craft_hash_type_max = (int) CRAFT_HASH_TYPE_UNHASHED;
 
/*
        Input: The contents of the crafting slots, arranged in matrix form
*/
struct CraftInput
{
        CraftMethod method = CRAFT_METHOD_NORMAL;
        unsigned int width = 0;
        std::vector<ItemStack> items;
 
        CraftInput() = default;
 
        CraftInput(CraftMethod method_, unsigned int width_,
                        const std::vector<ItemStack> &items_);
 
        // Returns true if all items are empty.
        bool empty() const;
 
        std::string dump() const;
};
 
/*
        Output: Result of crafting operation
*/
struct CraftOutput
{
        // Used for normal crafting and cooking, itemstring
        std::string item = "";
        // Used for cooking (cook time) and fuel (burn time), seconds
        float time = 0.0f;
 
        CraftOutput() = default;
 
        CraftOutput(const std::string &item_, float time_):
                item(item_), time(time_)
        {}
        std::string dump() const;
};
 
/*
        A list of replacements. A replacement indicates that a specific
        input item should not be deleted (when crafting) but replaced with
        a different item. Each replacements is a pair (itemstring to remove,
        itemstring to replace with)
 
        Example: If ("bucket:bucket_water", "bucket:bucket_empty") is a
        replacement pair, the crafting input slot that contained a water
        bucket will contain an empty bucket after crafting.
*/
struct CraftReplacements
{
        // List of replacements
        std::vector<std::pair<std::string, std::string> > pairs;
 
        CraftReplacements() = default;
        CraftReplacements(const std::vector<std::pair<std::string, std::string> > &pairs_):
                pairs(pairs_)
        {}
        std::string dump() const;
};
 
/*
        Crafting definition base class
*/
class CraftDefinition
{
public:
        /*
                Craft recipe priorities, from low to high
 
                Recipes are searched from latest to first.
                If a recipe with higher priority than a previous found one is
                encountered, it is selected instead.
        */
        enum RecipePriority
        {
                PRIORITY_NO_RECIPE,
                PRIORITY_TOOLREPAIR,
                PRIORITY_SHAPELESS_AND_GROUPS,
                PRIORITY_SHAPELESS,
                PRIORITY_SHAPED_AND_GROUPS,
                PRIORITY_SHAPED,
        };
 
        CraftDefinition() = default;
        virtual ~CraftDefinition() = default;
 
        // Returns type of crafting definition
        virtual std::string getName() const=0;
 
        // Checks whether the recipe is applicable
        virtual bool check(const CraftInput &input, IGameDef *gamedef) const=0;
        RecipePriority getPriority() const
        {
                return priority;
        }
        // Returns the output structure, meaning depends on crafting method
        // The implementation can assume that check(input) returns true
        virtual CraftOutput getOutput(const CraftInput &input, IGameDef *gamedef) const=0;
        // the inverse of the above
        virtual CraftInput getInput(const CraftOutput &output, IGameDef *gamedef) const=0;
        // Decreases count of every input item
        virtual void decrementInput(CraftInput &input,
                std::vector<ItemStack> &output_replacements, IGameDef *gamedef) const=0;
 
        CraftHashType getHashType() const
        {
                return hash_type;
        }
        virtual u64 getHash(CraftHashType type) const = 0;
 
        // to be called after all mods are loaded, so that we catch all aliases
        virtual void initHash(IGameDef *gamedef) = 0;
 
        virtual std::string dump() const=0;
 
protected:
        CraftHashType hash_type;
        RecipePriority priority;
};
 
/*
        A plain-jane (shaped) crafting definition
 
        Supported crafting method: CRAFT_METHOD_NORMAL.
        Requires the input items to be arranged exactly like in the recipe.
*/
class CraftDefinitionShaped: public CraftDefinition
{
public:
        CraftDefinitionShaped() = delete;
        CraftDefinitionShaped(
                const std::string &output_,
                unsigned int width_,
                const std::vector<std::string> &recipe_,
                const CraftReplacements &replacements_);
 
        virtual ~CraftDefinitionShaped() = default;
 
        virtual std::string getName() const;
        virtual bool check(const CraftInput &input, IGameDef *gamedef) const;
        virtual CraftOutput getOutput(const CraftInput &input, IGameDef *gamedef) const;
        virtual CraftInput getInput(const CraftOutput &output, IGameDef *gamedef) const;
        virtual void decrementInput(CraftInput &input,
                std::vector<ItemStack> &output_replacements, IGameDef *gamedef) const;
 
        virtual u64 getHash(CraftHashType type) const;
 
        virtual void initHash(IGameDef *gamedef);
 
        virtual std::string dump() const;
 
private:
        // Output itemstring
        std::string output = "";
        // Width of recipe
        unsigned int width = 1;
        // Recipe matrix (itemstrings)
        std::vector<std::string> recipe;
        // Recipe matrix (item names)
        std::vector<std::string> recipe_names;
        // bool indicating if initHash has been called already
        bool hash_inited = false;
        // Replacement items for decrementInput()
        CraftReplacements replacements;
};
 
/*
        A shapeless crafting definition
        Supported crafting method: CRAFT_METHOD_NORMAL.
        Input items can arranged in any way.
*/
class CraftDefinitionShapeless: public CraftDefinition
{
public:
        CraftDefinitionShapeless() = delete;
        CraftDefinitionShapeless(
                const std::string &output_,
                const std::vector<std::string> &recipe_,
                const CraftReplacements &replacements_);
 
        virtual ~CraftDefinitionShapeless() = default;
 
        virtual std::string getName() const;
        virtual bool check(const CraftInput &input, IGameDef *gamedef) const;
        virtual CraftOutput getOutput(const CraftInput &input, IGameDef *gamedef) const;
        virtual CraftInput getInput(const CraftOutput &output, IGameDef *gamedef) const;
        virtual void decrementInput(CraftInput &input,
                std::vector<ItemStack> &output_replacements, IGameDef *gamedef) const;
 
        virtual u64 getHash(CraftHashType type) const;
 
        virtual void initHash(IGameDef *gamedef);
 
        virtual std::string dump() const;
 
private:
        // Output itemstring
        std::string output;
        // Recipe list (itemstrings)
        std::vector<std::string> recipe;
        // Recipe list (item names), sorted
        std::vector<std::string> recipe_names;
        // bool indicating if initHash has been called already
        bool hash_inited = false;
        // Replacement items for decrementInput()
        CraftReplacements replacements;
};
 
/*
        Tool repair crafting definition
        Supported crafting method: CRAFT_METHOD_NORMAL.
        Put two damaged tools into the crafting grid, get one tool back.
        There should only be one crafting definition of this type.
*/
class CraftDefinitionToolRepair: public CraftDefinition
{
public:
        CraftDefinitionToolRepair() = delete;
        CraftDefinitionToolRepair(float additional_wear_);
 
        virtual ~CraftDefinitionToolRepair() = default;
 
        virtual std::string getName() const;
        virtual bool check(const CraftInput &input, IGameDef *gamedef) const;
        virtual CraftOutput getOutput(const CraftInput &input, IGameDef *gamedef) const;
        virtual CraftInput getInput(const CraftOutput &output, IGameDef *gamedef) const;
        virtual void decrementInput(CraftInput &input,
                std::vector<ItemStack> &output_replacements, IGameDef *gamedef) const;
 
        virtual u64 getHash(CraftHashType type) const { return 2; }
 
        virtual void initHash(IGameDef *gamedef)
        {
                hash_type = CRAFT_HASH_TYPE_COUNT;
        }
 
        virtual std::string dump() const;
 
private:
        // This is a constant that is added to the wear of the result.
        // May be positive or negative, allowed range [-1,1].
        // 1 = new tool is completely broken
        // 0 = simply add remaining uses of both input tools
        // -1 = new tool is completely pristine
        float additional_wear = 0.0f;
};
 
/*
        A cooking (in furnace) definition
        Supported crafting method: CRAFT_METHOD_COOKING.
*/
class CraftDefinitionCooking: public CraftDefinition
{
public:
        CraftDefinitionCooking() = delete;
        CraftDefinitionCooking(
                const std::string &output_,
                const std::string &recipe_,
                float cooktime_,
                const CraftReplacements &replacements_);
 
        virtual ~CraftDefinitionCooking() = default;
 
        virtual std::string getName() const;
        virtual bool check(const CraftInput &input, IGameDef *gamedef) const;
        virtual CraftOutput getOutput(const CraftInput &input, IGameDef *gamedef) const;
        virtual CraftInput getInput(const CraftOutput &output, IGameDef *gamedef) const;
        virtual void decrementInput(CraftInput &input,
                std::vector<ItemStack> &output_replacements, IGameDef *gamedef) const;
 
        virtual u64 getHash(CraftHashType type) const;
 
        virtual void initHash(IGameDef *gamedef);
 
        virtual std::string dump() const;
 
private:
        // Output itemstring
        std::string output;
        // Recipe itemstring
        std::string recipe;
        // Recipe item name
        std::string recipe_name;
        // bool indicating if initHash has been called already
        bool hash_inited = false;
        // Time in seconds
        float cooktime;
        // Replacement items for decrementInput()
        CraftReplacements replacements;
};
 
/*
        A fuel (for furnace) definition
        Supported crafting method: CRAFT_METHOD_FUEL.
*/
class CraftDefinitionFuel: public CraftDefinition
{
public:
        CraftDefinitionFuel() = delete;
        CraftDefinitionFuel(
                const std::string &recipe_,
                float burntime_,
                const CraftReplacements &replacements_);
 
        virtual ~CraftDefinitionFuel() = default;
 
        virtual std::string getName() const;
        virtual bool check(const CraftInput &input, IGameDef *gamedef) const;
        virtual CraftOutput getOutput(const CraftInput &input, IGameDef *gamedef) const;
        virtual CraftInput getInput(const CraftOutput &output, IGameDef *gamedef) const;
        virtual void decrementInput(CraftInput &input,
                std::vector<ItemStack> &output_replacements, IGameDef *gamedef) const;
 
        virtual u64 getHash(CraftHashType type) const;
 
        virtual void initHash(IGameDef *gamedef);
 
        virtual std::string dump() const;
 
private:
        // Recipe itemstring
        std::string recipe;
        // Recipe item name
        std::string recipe_name;
        // bool indicating if initHash has been called already
        bool hash_inited = false;
        // Time in seconds
        float burntime;
        // Replacement items for decrementInput()
        CraftReplacements replacements;
};
 
/*
        Crafting definition manager
*/
class ICraftDefManager
{
public:
        ICraftDefManager() = default;
        virtual ~ICraftDefManager() = default;
 
        virtual bool getCraftResult(CraftInput &input, CraftOutput &output,
                        std::vector<ItemStack> &output_replacements,
                        bool decrementInput, IGameDef *gamedef) const=0;
 
        virtual std::vector<CraftDefinition*> getCraftRecipes(CraftOutput &output,
                        IGameDef *gamedef, unsigned limit=0) const=0;
 
        // Print crafting recipes for debugging
        virtual std::string dump() const=0;
};
 
class IWritableCraftDefManager : public ICraftDefManager
{
public:
        IWritableCraftDefManager() = default;
        virtual ~IWritableCraftDefManager() = default;
 
        // The main crafting function
        virtual bool getCraftResult(CraftInput &input, CraftOutput &output,
                        std::vector<ItemStack> &output_replacements,
                        bool decrementInput, IGameDef *gamedef) const=0;
        virtual std::vector<CraftDefinition*> getCraftRecipes(CraftOutput &output,
                        IGameDef *gamedef, unsigned limit=0) const=0;
 
        virtual bool clearCraftsByOutput(const CraftOutput &output, IGameDef *gamedef) = 0;
        virtual bool clearCraftsByInput(const CraftInput &input, IGameDef *gamedef) = 0;
 
        // Print crafting recipes for debugging
        virtual std::string dump() const=0;
 
        // Add a crafting definition.
        // After calling this, the pointer belongs to the manager.
        virtual void registerCraft(CraftDefinition *def, IGameDef *gamedef) = 0;
 
        // Delete all crafting definitions
        virtual void clear()=0;
 
        // To be called after all mods are loaded, so that we catch all aliases
        virtual void initHashes(IGameDef *gamedef) = 0;
};
 
IWritableCraftDefManager* createCraftDefManager();