// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

#pragma once

#include "CalculatorHistory.h"
#include "Header Files/CalcEngine.h"
#include "Header Files/Rational.h"
#include "Header Files/ICalcDisplay.h"

namespace CalculationManager
{
    enum class Command;
    struct HISTORYITEM;

    enum class CalculatorMode
    {
        StandardMode,
        ScientificMode,
        ProgrammerMode,
    };

    enum class CalculatorPrecision
    {
        StandardModePrecision = 16,
        ScientificModePrecision = 32,
        ProgrammerModePrecision = 64
    };

    // Numbering continues from the Enum Command from Command.h 
    // with some gap to ensure there is no overlap of these ids
    // when static_cast<unsigned char> is performed on these ids 
    // they shouldn't fall in any number range greater than 80. So never
    // make the memory command ids go below 330
    enum class MemoryCommand
    {
        MemorizeNumber = 330,
        MemorizedNumberLoad = 331,
        MemorizedNumberAdd = 332,
        MemorizedNumberSubtract = 333,
        MemorizedNumberClearAll = 334,
        MemorizedNumberClear = 335
    };

    class CalculatorManager sealed : public virtual ICalcDisplay
    {
    private:
        ICalcDisplay* const m_displayCallback;
        CCalcEngine* m_currentCalculatorEngine;
        std::unique_ptr<CCalcEngine> m_scientificCalculatorEngine;
        std::unique_ptr<CCalcEngine> m_standardCalculatorEngine;
        std::unique_ptr<CCalcEngine> m_programmerCalculatorEngine;
        IResourceProvider* const m_resourceProvider;
        bool m_inHistoryItemLoadMode;

        std::vector<CalcEngine::Rational> m_memorizedNumbers;
        CalcEngine::Rational m_persistedPrimaryValue;

        bool m_isExponentialFormat;

        static const unsigned int m_maximumMemorySize = 100;

        // For persistence
        std::vector<unsigned char> m_savedCommands;
        std::vector<long> m_savedPrimaryValue;
        std::vector<long> m_serializedMemory;
        std::vector<long> m_currentSerializedMemory;
        Command m_currentDegreeMode;
        Command m_savedDegreeMode;
        unsigned char MapCommandForSerialize(Command command);
        unsigned int MapCommandForDeSerialize(unsigned char command);

        void SaveMemoryCommand(_In_ MemoryCommand command, _In_ unsigned int indexOfMemory);

        void MemorizedNumberSelect(_In_ unsigned int);
        void MemorizedNumberChanged(_In_ unsigned int);

        void LoadPersistedPrimaryValue();

        static std::vector<long> SerializeRational(CalcEngine::Rational const& rat);
        static CalcEngine::Rational DeSerializeRational(std::vector<long>::const_iterator itr);

        static std::vector<long> SerializeNumber(CalcEngine::Number const& num);
        static CalcEngine::Number DeSerializeNumber(std::vector<long>::const_iterator itr);

        std::shared_ptr<CalculatorHistory> m_pStdHistory;
        std::shared_ptr<CalculatorHistory> m_pSciHistory;
        CalculatorHistory* m_pHistory;

    public:
        // ICalcDisplay
        void SetPrimaryDisplay(_In_ const std::wstring& displayString, _In_ bool isError) override;
        void SetIsInError(bool isError) override;
        void SetExpressionDisplay(_Inout_ std::shared_ptr<CalculatorVector<std::pair<std::wstring, int>>> const &tokens, _Inout_ std::shared_ptr<CalculatorVector<std::shared_ptr<IExpressionCommand>>> const &commands) override;
        void SetMemorizedNumbers(_In_ const std::vector<std::wstring>& memorizedNumbers) override;
        void OnHistoryItemAdded(_In_ unsigned int addedItemIndex) override;
        void SetParenDisplayText(const std::wstring& parenthesisCount);
        void DisplayPasteError();
        void MaxDigitsReached() override;
        void BinaryOperatorReceived() override;
        void MemoryItemChanged(unsigned int indexOfMemory) override;


        CalculatorManager(ICalcDisplay* displayCallback, IResourceProvider* resourceProvider);
        ~CalculatorManager();

        void Reset(bool clearMemory = true);
        void SetStandardMode();
        void SetScientificMode();
        void SetProgrammerMode();
        void SendCommand(_In_ Command command);
        std::vector<unsigned char> SerializeCommands();
        void DeSerializeCommands(_In_ const std::vector<unsigned char>& serializedData);
        void SerializeMemory();
        std::vector<long> GetSerializedMemory();
        void DeSerializeMemory(const std::vector<long> &serializedMemory);
        void SerializePrimaryDisplay();
        std::vector<long> GetSerializedPrimaryDisplay();
        void DeSerializePrimaryDisplay(const std::vector<long> &serializedPrimaryDisplay);
        Command SerializeSavedDegreeMode();

        void MemorizeNumber();
        void MemorizedNumberLoad(_In_ unsigned int);
        void MemorizedNumberAdd(_In_ unsigned int);
        void MemorizedNumberSubtract(_In_ unsigned int);
        void MemorizedNumberClear(_In_ unsigned int);
        void MemorizedNumberClearAll();

        bool IsEngineRecording();
        std::vector<unsigned char> GetSavedCommands(){ return m_savedCommands; }
        void SetRadix(RADIX_TYPE iRadixType);
        void SetMemorizedNumbersString();
        std::wstring GetResultForRadix(uint32_t radix, int32_t precision);
        void SetPrecision(int32_t precision);
        void UpdateMaxIntDigits();
        wchar_t DecimalSeparator();

        std::vector<std::shared_ptr<HISTORYITEM>> const& GetHistoryItems();
        std::vector<std::shared_ptr<HISTORYITEM>> const& GetHistoryItems(_In_ CalculationManager::CALCULATOR_MODE mode);
        std::shared_ptr<HISTORYITEM> const& GetHistoryItem(_In_ unsigned int uIdx);
        bool RemoveHistoryItem(_In_ unsigned int uIdx);
        void ClearHistory();
        const size_t MaxHistorySize() const { return m_pHistory->MaxHistorySize(); }
        CalculationManager::Command GetCurrentDegreeMode();
        void SetHistory(_In_ CALCULATOR_MODE eMode, _In_ std::vector<std::shared_ptr<HISTORYITEM>> const& history);
        void SetInHistoryItemLoadMode(_In_ bool isHistoryItemLoadMode);
    };
}