/*
  ==============================================================================

   This file is part of the JUCE examples.
   Copyright (c) 2020 - Raw Material Software Limited

   The code included in this file is provided under the terms of the ISC license
   http://www.isc.org/downloads/software-support-policy/isc-license. Permission
   To use, copy, modify, and/or distribute this software for any purpose with or
   without fee is hereby granted provided that the above copyright notice and
   this permission notice appear in all copies.

   THE SOFTWARE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES,
   WHETHER EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR
   PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

/*******************************************************************************
 The block below describes the properties of this PIP. A PIP is a short snippet
 of code that can be read by the Projucer and used to generate a JUCE project.

 BEGIN_JUCE_PIP_METADATA

 name:             CryptographyDemo
 version:          1.0.0
 vendor:           JUCE
 website:          http://juce.com
 description:      Encrypts and decrypts data.

 dependencies:     juce_core, juce_cryptography, juce_data_structures, juce_events,
                   juce_graphics, juce_gui_basics
 exporters:        xcode_mac, vs2019, linux_make, androidstudio, xcode_iphone

 moduleFlags:      JUCE_STRICT_REFCOUNTEDPOINTER=1

 type:             Component
 mainClass:        CryptographyDemo

 useLocalCopy:     1

 END_JUCE_PIP_METADATA

*******************************************************************************/

#pragma once

#include "../Assets/DemoUtilities.h"

//==============================================================================
class RSAComponent  : public Component
{
public:
    RSAComponent()
    {
        addAndMakeVisible (rsaGroup);

        addAndMakeVisible (bitSize);
        bitSize.setText (String (256));
        bitSizeLabel.attachToComponent (&bitSize, true);

        addAndMakeVisible (generateRSAButton);
        generateRSAButton.onClick = [this] { createRSAKey(); };

        addAndMakeVisible (rsaResultBox);
        rsaResultBox.setReadOnly (true);
        rsaResultBox.setMultiLine (true);
    }

    void resized() override
    {
        auto area = getLocalBounds();
        rsaGroup.setBounds (area);
        area.removeFromTop (10);
        area.reduce (5, 5);

        auto topArea = area.removeFromTop (34);
        topArea.removeFromLeft (110);
        bitSize.setBounds (topArea.removeFromLeft (topArea.getWidth() / 2).reduced (5));
        generateRSAButton.setBounds (topArea.reduced (5));

        rsaResultBox.setBounds (area.reduced (5));
    }

private:
    void createRSAKey()
    {
        auto bits = jlimit (32, 1024, bitSize.getText().getIntValue());
        bitSize.setText (String (bits), dontSendNotification);

        // Create a key-pair...
        RSAKey publicKey, privateKey;
        RSAKey::createKeyPair (publicKey, privateKey, bits);

        // Test the new key on a piece of data...
        BigInteger testValue;
        testValue.parseString ("1234567890abcdef", 16);

        auto encodedValue = testValue;
        publicKey.applyToValue (encodedValue);

        auto decodedValue = encodedValue;
        privateKey.applyToValue (decodedValue);

        // ..and show the results..
        String message;
        message << "Number of bits: " << bits << newLine
                << "Public Key: "  << publicKey .toString() << newLine
                << "Private Key: " << privateKey.toString() << newLine
                << newLine
                << "Test input: " << testValue.toString (16) << newLine
                << "Encoded: " << encodedValue.toString (16) << newLine
                << "Decoded: " << decodedValue.toString (16) << newLine;

        rsaResultBox.setText (message, false);
    }

    GroupComponent rsaGroup       { {}, "RSA Encryption" };
    TextButton generateRSAButton  { "Generate RSA" };
    Label bitSizeLabel            { {}, "Num Bits to Use:" };
    TextEditor bitSize, rsaResultBox;

    void lookAndFeelChanged() override
    {
        rsaGroup.setColour (GroupComponent::outlineColourId,
                            getUIColourIfAvailable (LookAndFeel_V4::ColourScheme::UIColour::outline,
                                                    Colours::grey));
        rsaGroup.setColour (GroupComponent::textColourId,
                            getUIColourIfAvailable (LookAndFeel_V4::ColourScheme::UIColour::defaultText,
                                                    Colours::white));
        rsaResultBox.setColour (TextEditor::backgroundColourId,
                                getUIColourIfAvailable (LookAndFeel_V4::ColourScheme::UIColour::widgetBackground,
                                                        Colours::white.withAlpha (0.5f)));

        bitSize.applyFontToAllText (bitSize.getFont());
        rsaResultBox.applyFontToAllText (rsaResultBox.getFont());
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (RSAComponent)
};

//==============================================================================
class HashesComponent  : public Component
{
public:
    HashesComponent()
    {
        addAndMakeVisible (hashGroup);

        addAndMakeVisible (hashEntryBox);
        hashEntryBox.setMultiLine (true);

        hashEntryBox.setReturnKeyStartsNewLine (true);
        hashEntryBox.setText ("Type some text in this box and the resulting MD5, SHA and Whirlpool hashes will update below");

        auto updateHashes = [this]
        {
            auto text = hashEntryBox.getText();

            updateMD5Result       (text.toUTF8());
            updateSHA256Result    (text.toUTF8());
            updateWhirlpoolResult (text.toUTF8());
        };

        hashEntryBox.onTextChange = updateHashes;
        hashEntryBox.onReturnKey  = updateHashes;

        hashLabel1.attachToComponent (&hashEntryBox,    true);
        hashLabel2.attachToComponent (&md5Result,       true);
        hashLabel3.attachToComponent (&shaResult,       true);
        hashLabel4.attachToComponent (&whirlpoolResult, true);

        addAndMakeVisible (md5Result);
        addAndMakeVisible (shaResult);
        addAndMakeVisible (whirlpoolResult);

        updateHashes();
    }

    void updateMD5Result (CharPointer_UTF8 text)
    {
        md5Result.setText (MD5 (text).toHexString(), dontSendNotification);
    }

    void updateSHA256Result (CharPointer_UTF8 text)
    {
        shaResult.setText (SHA256 (text).toHexString(), dontSendNotification);
    }

    void updateWhirlpoolResult (CharPointer_UTF8 text)
    {
        whirlpoolResult.setText (Whirlpool (text).toHexString(), dontSendNotification);
    }

    void resized() override
    {
        auto area = getLocalBounds();

        hashGroup.setBounds (area);

        area.removeFromLeft (120);
        area.removeFromTop (10);
        area.reduce (5, 5);

        whirlpoolResult.setBounds (area.removeFromBottom (34));
        shaResult      .setBounds (area.removeFromBottom (34));
        md5Result      .setBounds (area.removeFromBottom (34));
        hashEntryBox   .setBounds (area.reduced (5));
    }

private:
    GroupComponent hashGroup { {}, "Hashes" };
    TextEditor hashEntryBox;
    Label md5Result, shaResult, whirlpoolResult;

    Label hashLabel1  { {}, "Text to Hash:" };
    Label hashLabel2  { {}, "MD5 Result:" };
    Label hashLabel3  { {}, "SHA Result:" };
    Label hashLabel4  { {}, "Whirlpool Result:" };

    void lookAndFeelChanged() override
    {
        hashGroup.setColour (GroupComponent::outlineColourId,
                             getUIColourIfAvailable (LookAndFeel_V4::ColourScheme::UIColour::outline,
                                                     Colours::grey));
        hashGroup.setColour (GroupComponent::textColourId,
                             getUIColourIfAvailable (LookAndFeel_V4::ColourScheme::UIColour::defaultText,
                                                     Colours::white));
        hashEntryBox.setColour (TextEditor::backgroundColourId,
                                getUIColourIfAvailable (LookAndFeel_V4::ColourScheme::UIColour::widgetBackground,
                                                        Colours::white.withAlpha (0.5f)));

        hashEntryBox.applyFontToAllText (hashEntryBox.getFont());
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (HashesComponent)
};

//==============================================================================
class CryptographyDemo  : public Component
{
public:
    CryptographyDemo()
    {
        addAndMakeVisible (rsaDemo);
        addAndMakeVisible (hashDemo);

        setSize (750, 750);
    }

    void paint (Graphics& g) override
    {
        g.fillAll (getUIColourIfAvailable (LookAndFeel_V4::ColourScheme::UIColour::windowBackground,
                                           Colour::greyLevel (0.4f)));
    }

    void resized() override
    {
        auto area = getLocalBounds();

        rsaDemo .setBounds (area.removeFromTop (getHeight() / 2).reduced (5));
        hashDemo.setBounds (area.reduced (5));
    }

private:
    RSAComponent rsaDemo;
    HashesComponent hashDemo;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (CryptographyDemo)
};