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#pragma once
#include "Model/EvaluatedValue.hpp"
#include "cplt_fwd.hpp"
#include <cstddef>
#include <cstdint>
#include <limits>
#include <memory>
#include <vector>
class WorkflowConnection {
public:
static constexpr auto kInvalidId = std::numeric_limits<size_t>::max();
size_t Source;
size_t Destination;
int SourcePin;
int DestinationPin;
public:
WorkflowConnection();
bool IsValid() 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;
/// 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;
};
struct OutputPin {
size_t Connection = WorkflowConnection::kInvalidId;
BaseValue::Kind MatchingType = BaseValue::KindInvalid;
bool IsConnected() const;
};
friend class Workflow;
friend class WorkflowEvaluationError;
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);
void Connect(WorkflowNode& source, int sourceNode, WorkflowNode& destination, int destinationNode);
void DisconnectBySource(WorkflowNode& source, int sourceNode);
void DisconnectByDestination(WorkflowNode& destination, int destinationNode);
private:
std::pair<WorkflowConnection&, size_t> AllocWorkflowConnection();
std::pair<std::unique_ptr<WorkflowNode>&, size_t> AllocWorkflowStep();
};
class WorkflowEvaluationError {
public:
enum MessageType : int16_t {
Error,
Warning,
};
enum PinType : int16_t {
NoPin,
InputPin,
OutputPin,
};
public:
std::string Message;
size_t NodeId;
int PinId;
PinType PinType;
MessageType Type;
};
class WorkflowEvaluationContext {
private:
struct RuntimeNode;
struct RuntimeConnection;
Workflow* mWorkflow;
std::vector<RuntimeNode> mNodes;
std::vector<RuntimeConnection> mConnections;
std::vector<WorkflowEvaluationError> mErrors;
std::vector<WorkflowEvaluationError> mWarnings;
public:
WorkflowEvaluationContext(Workflow& workflow);
BaseValue* GetConnectionValue(size_t id, bool constant);
BaseValue* GetConnectionValue(const WorkflowNode::InputPin& inputPin);
void SetConnectionValue(size_t id, std::unique_ptr<BaseValue> value);
void SetConnectionValue(const WorkflowNode::OutputPin& outputPin, std::unique_ptr<BaseValue> value);
void ReportError(std::string message, const WorkflowNode& node, int pinId, bool inputPin);
void ReportError(std::string message, const WorkflowNode& node);
void ReportWarning(std::string message, const WorkflowNode& node, int pinId, bool inputPin);
void ReportWarning(std::string message, const WorkflowNode& node);
/// Run until all possible paths have been evaluated.
void Run();
};
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