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#pragma once
#include "Value.hpp"
#include "cplt_fwd.hpp"
#include <cstddef>
#include <cstdint>
#include <limits>
#include <memory>
#include <span>
#include <string>
#include <vector>
class WorkflowConnection {
public:
static constexpr auto kInvalidId = std::numeric_limits<size_t>::max();
enum Direction {
ManyToOne,
OneToMany,
};
struct ConnectionPoint {
size_t Node;
int Pin;
bool operator==(const ConnectionPoint&) const = default;
};
std::vector<ConnectionPoint> MultiConnections;
ConnectionPoint SingleConnection;
Direction ConnectionDirection;
public:
WorkflowConnection();
bool IsValid() const;
std::span<ConnectionPoint> GetSourcePoints();
std::span<const ConnectionPoint> GetSourcePoints() const;
std::span<ConnectionPoint> GetDestinationPoints();
std::span<const ConnectionPoint> GetDestinationPoints() const;
};
class WorkflowNode {
public:
static constexpr auto kInvalidId = std::numeric_limits<size_t>::max();
enum Type {
InputType,
TransformType,
OutputType,
};
enum Kind {
KD_NumericAddition,
KD_NumericSubtraction,
KD_NumericMultiplication,
KD_NumericDivision,
KD_NumericExpression,
KD_TextFormatting,
KD_DocumentTemplateExpansion,
KD_FormInput,
KD_DatabaseRowsInput,
InvalidKind,
KindCount = InvalidKind,
};
protected:
struct InputPin {
size_t Connection = WorkflowConnection::kInvalidId;
BaseValue::Kind MatchingType = BaseValue::KindInvalid;
bool ConnectionToConst = false;
bool AllowsMultipleConnections = false;
/// A constant connection connects from a user-specified constant value, feeding to a valid \c Destination and \c DestinationPin (i.e. input pins).
bool IsConstantConnection() const;
bool IsConnected() const;
BaseValue::Kind GetMatchingType() const;
WorkflowConnection::Direction GetSupportedDirection() const;
};
struct OutputPin {
size_t Connection = WorkflowConnection::kInvalidId;
BaseValue::Kind MatchingType = BaseValue::KindInvalid;
bool AllowsMultipleConnections = false;
bool IsConnected() const;
BaseValue::Kind GetMatchingType() const;
WorkflowConnection::Direction GetSupportedDirection() const;
};
friend class Workflow;
friend class WorkflowEvaluationContext;
Workflow* mWorkflow;
size_t mId;
std::vector<InputPin> mInputs;
std::vector<OutputPin> mOutputs;
Type mType;
Kind mKind;
public:
WorkflowNode(Type type, Kind kind);
virtual ~WorkflowNode() = default;
WorkflowNode(const WorkflowNode&) = delete;
WorkflowNode& operator=(const WorkflowNode&) = delete;
WorkflowNode(WorkflowNode&&) = default;
WorkflowNode& operator=(WorkflowNode&&) = default;
size_t GetId() const;
Type GetType() const;
Kind GetKind() const;
void ConnectInput(int nodeId, WorkflowNode& output, int outputNodeId);
void DisconnectInput(int nodeId);
bool IsInputConnected(int nodeId) const;
void ConnectOutput(int nodeId, WorkflowNode& input, int inputNodeId);
void DisconnectOutput(int nodeId);
bool IsOutputConnected(int nodeId) const;
virtual void Evaluate(WorkflowEvaluationContext& ctx) = 0;
protected:
InputPin& InsertInputPin(int atIdx);
void RemoveInputPin(int pin);
void SwapInputPin(int a, int b);
OutputPin& InsertOutputPin(int atIdx);
void RemoveOutputPin(int pin);
void SwapOutputPin(int a, int b);
/* For \c Workflow to invoke, override by implementations */
void OnAttach(Workflow& workflow, size_t newId) {}
void OnDetach() {}
};
class Workflow {
private:
friend class WorkflowEvaluationContext;
std::vector<WorkflowConnection> mConnections;
std::vector<std::unique_ptr<WorkflowNode>> mNodes;
std::vector<std::unique_ptr<BaseValue>> mConstants;
public:
WorkflowConnection* GetConnectionById(size_t id);
WorkflowNode* GetStepById(size_t id);
BaseValue* GetConstantById(size_t id);
void AddStep(std::unique_ptr<WorkflowNode> step);
void RemoveStep(size_t id);
bool Connect(WorkflowNode& sourceNode, int sourcePin, WorkflowNode& destinationNode, int destinationPin);
bool DisconnectBySource(WorkflowNode& sourceNode, int sourcePin);
bool DisconnectByDestination(WorkflowNode& destinationNode, int destinationPin);
private:
std::pair<WorkflowConnection&, size_t> AllocWorkflowConnection();
std::pair<std::unique_ptr<WorkflowNode>&, size_t> AllocWorkflowStep();
};
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