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

   This file is part of the JUCE 6 technical preview.
   Copyright (c) 2020 - Raw Material Software Limited

   You may use this code under the terms of the GPL v3
   (see www.gnu.org/licenses).

   For this technical preview, this file is not subject to commercial licensing.

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

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

#pragma once


#include "../../Project/UI/jucer_UserAvatarComponent.h"

//==============================================================================
class LoginFormComponent  : public Component
{
public:
    LoginFormComponent (MainWindow& window)
        : mainWindow (window)
    {
        addAndMakeVisible (emailBox);
        emailBox.setTextToShowWhenEmpty ("Email", Colours::black.withAlpha (0.2f));
        emailBox.setJustification (Justification::centredLeft);
        emailBox.onReturnKey = [this] { submitDetails(); };

        addAndMakeVisible (passwordBox);
        passwordBox.setTextToShowWhenEmpty ("Password", Colours::black.withAlpha (0.2f));
        passwordBox.setPasswordCharacter ((juce_wchar) 0x2022);
        passwordBox.setJustification (Justification::centredLeft);
        passwordBox.onReturnKey = [this] { submitDetails(); };

        addAndMakeVisible (logInButton);
        logInButton.onClick = [this] { submitDetails(); };

        addAndMakeVisible (enableGPLButton);
        enableGPLButton.onClick = [this]
        {
            ProjucerApplication::getApp().getLicenseController().setState (LicenseController::getGPLState());
            mainWindow.hideLoginFormOverlay();
        };

        addAndMakeVisible (userAvatar);

        addAndMakeVisible (createAccountLabel);
        createAccountLabel.setFont (Font (14.0f, Font::underlined));
        createAccountLabel.addMouseListener (this, false);
        createAccountLabel.setMouseCursor (MouseCursor::PointingHandCursor);

        addAndMakeVisible (errorMessageLabel);
        errorMessageLabel.setMinimumHorizontalScale (1.0f);
        errorMessageLabel.setFont (12.0f);
        errorMessageLabel.setColour (Label::textColourId, Colours::red);
        errorMessageLabel.setVisible (false);

        dismissButton.setShape (getLookAndFeel().getCrossShape (1.0f), false, true, false);
        addAndMakeVisible (dismissButton);
        dismissButton.onClick = [this] { mainWindow.hideLoginFormOverlay(); };

        setWantsKeyboardFocus (true);
        setOpaque (true);

        lookAndFeelChanged();

        setSize (300, 350);
    }

    ~LoginFormComponent() override
    {
        ProjucerApplication::getApp().getLicenseController().cancelSignIn();
    }

    void resized() override
    {
        auto bounds = getLocalBounds().reduced (20);
        auto spacing = bounds.getHeight() / 20;

        userAvatar.setBounds (bounds.removeFromTop (iconHeight).reduced ((bounds.getWidth() / 2) - (iconHeight / 2), 0));

        errorMessageLabel.setBounds (bounds.removeFromTop (spacing));
        bounds.removeFromTop (spacing / 2);

        auto textEditorHeight = bounds.getHeight() / 5;

        emailBox.setBounds (bounds.removeFromTop (textEditorHeight));
        bounds.removeFromTop (spacing);

        passwordBox.setBounds (bounds.removeFromTop (textEditorHeight));
        bounds.removeFromTop (spacing * 2);

        emailBox.setFont (Font (textEditorHeight / 2.5f));
        passwordBox.setFont (Font (textEditorHeight / 2.5f));

        logInButton.setBounds (bounds.removeFromTop (textEditorHeight));

        auto slice = bounds.removeFromTop (textEditorHeight);
        createAccountLabel.setBounds (slice.removeFromLeft (createAccountLabel.getFont().getStringWidth (createAccountLabel.getText()) + 5));
        slice.removeFromLeft (15);
        enableGPLButton.setBounds (slice.reduced (0, 5));

        dismissButton.setBounds (getLocalBounds().reduced (10).removeFromTop (20).removeFromRight (20));
    }

    void paint (Graphics& g) override
    {
        g.fillAll (findColour (secondaryBackgroundColourId).contrasting (0.1f));
    }

    void mouseUp (const MouseEvent& event) override
    {
        if (event.eventComponent == &createAccountLabel)
            URL ("https://juce.com/verification/register").launchInDefaultBrowser();
    }

    void lookAndFeelChanged() override
    {
        enableGPLButton.setColour (TextButton::buttonColourId, findColour (secondaryButtonBackgroundColourId));
    }

private:
    class ProgressButton  : public TextButton,
                            private Timer
    {
    public:
        ProgressButton (const String& buttonName)
            : TextButton (buttonName), text (buttonName)
        {
        }

        void setBusy (bool shouldBeBusy)
        {
            isInProgress = shouldBeBusy;

            if (isInProgress)
            {
                setEnabled (false);
                setButtonText ({});
                startTimerHz (30);
            }
            else
            {
                setEnabled (true);
                setButtonText (text);
                stopTimer();
            }
        }

        void paint (Graphics& g) override
        {
            TextButton::paint (g);

            if (isInProgress)
            {
                auto size = getHeight() - 10;
                auto halfSize = size / 2;

                getLookAndFeel().drawSpinningWaitAnimation (g, Colours::white,
                                                            (getWidth() / 2) - halfSize, (getHeight() / 2) - halfSize,
                                                            size, size);
            }
        }

    private:
        void timerCallback() override
        {
            repaint();
        }

        String text;
        bool isInProgress = false;
    };

    //==============================================================================
    void updateLoginButtonStates (bool isLoggingIn)
    {
        logInButton.setBusy (isLoggingIn);

        emailBox.setEnabled (! isLoggingIn);
        passwordBox.setEnabled (! isLoggingIn);
    }

    void submitDetails()
    {
        auto loginFormError = checkLoginFormsAreValid();

        if (loginFormError.isNotEmpty())
        {
            showErrorMessage (loginFormError);
            return;
        }

        updateLoginButtonStates (true);

        WeakReference<Component> weakThis (this);
        auto completionCallback = [this, weakThis] (const String& errorMessage)
        {
            if (weakThis == nullptr)
                return;

            updateLoginButtonStates (false);

            if (errorMessage.isNotEmpty())
            {
                showErrorMessage (errorMessage);
            }
            else
            {
                hideErrorMessage();
                mainWindow.hideLoginFormOverlay();
                ProjucerApplication::getApp().getCommandManager().commandStatusChanged();
            }
        };

        ProjucerApplication::getApp().getLicenseController().signIn (emailBox.getText(), passwordBox.getText(),
                                                                     std::move (completionCallback));
    }

    String checkLoginFormsAreValid() const
    {
        auto email = emailBox.getText();

        if (email.isEmpty() || email.indexOfChar ('@') < 0)
            return "Please enter a valid email.";

        auto password = passwordBox.getText();

        if (password.isEmpty() || password.length() < 8)
            return "Please enter a valid password.";

        return {};
    }

    void showErrorMessage (const String& errorMessage)
    {
        errorMessageLabel.setText (errorMessage, dontSendNotification);
        errorMessageLabel.setVisible (true);
    }

    void hideErrorMessage()
    {
        errorMessageLabel.setText ({}, dontSendNotification);
        errorMessageLabel.setVisible (false);
    }

    //==============================================================================
    static constexpr int iconHeight = 50;

    MainWindow& mainWindow;

    TextEditor emailBox, passwordBox;
    ProgressButton logInButton { "Sign In" };
    TextButton enableGPLButton { "Enable GPL Mode" };
    ShapeButton dismissButton { {},
                                findColour (treeIconColourId),
                                findColour (treeIconColourId).overlaidWith (findColour (defaultHighlightedTextColourId).withAlpha (0.2f)),
                                findColour (treeIconColourId).overlaidWith (findColour (defaultHighlightedTextColourId).withAlpha (0.4f)) };
    UserAvatarComponent userAvatar { false };
    Label createAccountLabel { {}, "Create an account" },
          errorMessageLabel { {}, {} };

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (LoginFormComponent)
};