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

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

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

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

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

namespace juce::detail
{

#if JUCE_MSVC
 // required to enable the newer dialog box on vista and above
 #pragma comment(linker,                             \
         "\"/MANIFESTDEPENDENCY:type='Win32' "       \
         "name='Microsoft.Windows.Common-Controls' " \
         "version='6.0.0.0' "                        \
         "processorArchitecture='*' "                \
         "publicKeyToken='6595b64144ccf1df' "        \
         "language='*'\""                            \
     )
#endif

std::unique_ptr<ScopedMessageBoxInterface> ScopedMessageBoxInterface::create (const MessageBoxOptions& options)
{
    class WindowsMessageBoxBase : public ScopedMessageBoxInterface
    {
    public:
        explicit WindowsMessageBoxBase (Component* comp)
            : associatedComponent (comp) {}

        void runAsync (std::function<void (int)> recipient) override
        {
            future = std::async (std::launch::async, [showMessageBox = getShowMessageBox(), recipient]
            {
                const auto initComResult = CoInitializeEx (nullptr, COINIT_APARTMENTTHREADED | COINIT_DISABLE_OLE1DDE);

                if (initComResult != S_OK)
                    return;

                const ScopeGuard scope { [] { CoUninitialize(); } };

                const auto messageResult = showMessageBox != nullptr ? showMessageBox() : 0;
                NullCheckedInvocation::invoke (recipient, messageResult);
            });
        }

        int runSync() override
        {
            if (auto showMessageBox = getShowMessageBox())
                return showMessageBox();

            return 0;
        }

        void close() override
        {
            if (auto* toClose = windowHandle.exchange (nullptr))
                EndDialog (toClose, 0);
        }

        void setDialogWindowHandle (HWND dialogHandle)
        {
            windowHandle = dialogHandle;
        }

    private:
        std::function<int()> getShowMessageBox()
        {
            const auto parent = associatedComponent != nullptr ? (HWND) associatedComponent->getWindowHandle() : nullptr;
            return getShowMessageBoxForParent (parent);
        }

        /*  Returns a function that should display a message box and return the result.

            getShowMessageBoxForParent() will be called on the message thread.

            The returned function will be called on a separate thread, in order to avoid blocking the
            message thread.

            'this' is guaranteed to be alive when the returned function is called.
        */
        virtual std::function<int()> getShowMessageBoxForParent (HWND parent) = 0;

        Component::SafePointer<Component> associatedComponent;
        std::atomic<HWND> windowHandle { nullptr };
        std::future<void> future;

        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (WindowsMessageBoxBase)
    };

    class PreVistaMessageBox final : public WindowsMessageBoxBase
    {
    public:
        PreVistaMessageBox (const MessageBoxOptions& opts, UINT extraFlags)
            : WindowsMessageBoxBase (opts.getAssociatedComponent()),
              flags (extraFlags | getMessageBoxFlags (opts.getIconType())),
              title (opts.getTitle()), message (opts.getMessage()) {}

    private:
        std::function<int()> getShowMessageBoxForParent (const HWND parent) override
        {
            JUCE_ASSERT_MESSAGE_THREAD

            static std::map<DWORD, PreVistaMessageBox*> map;
            static std::mutex mapMutex;

            return [this, parent]
            {
                const auto threadId = GetCurrentThreadId();

                {
                    const std::scoped_lock scope { mapMutex };
                    map.emplace (threadId, this);
                }

                const ScopeGuard eraseFromMap { [threadId]
                {
                    const std::scoped_lock scope { mapMutex };
                    map.erase (threadId);
                } };

                const auto hookCallback = [] (int nCode, const WPARAM wParam, const LPARAM lParam)
                {
                    auto* params = reinterpret_cast<CWPSTRUCT*> (lParam);

                    if (nCode >= 0
                        && params != nullptr
                        && (params->message == WM_INITDIALOG || params->message == WM_DESTROY))
                    {
                        const auto callbackThreadId = GetCurrentThreadId();

                        const std::scoped_lock scope { mapMutex };

                        if (const auto iter = map.find (callbackThreadId); iter != map.cend())
                            iter->second->setDialogWindowHandle (params->message == WM_INITDIALOG ? params->hwnd : nullptr);
                    }

                    return CallNextHookEx ({}, nCode, wParam, lParam);
                };

                const auto hook = SetWindowsHookEx (WH_CALLWNDPROC,
                                                    hookCallback,
                                                    (HINSTANCE) juce::Process::getCurrentModuleInstanceHandle(),
                                                    threadId);
                const ScopeGuard removeHook { [hook] { UnhookWindowsHookEx (hook); } };

                const auto result = MessageBox (parent, message.toWideCharPointer(), title.toWideCharPointer(), flags);

                if (result == IDYES || result == IDOK)     return 0;
                if (result == IDNO && ((flags & 1) != 0))  return 1;

                return 2;
            };
        }

        static UINT getMessageBoxFlags (MessageBoxIconType iconType) noexcept
        {
            // this window can get lost behind JUCE windows which are set to be alwaysOnTop
            // so if there are any set it to be topmost
            const auto topmostFlag = WindowUtils::areThereAnyAlwaysOnTopWindows() ? MB_TOPMOST : 0;

            const auto iconFlags = [&]() -> decltype (topmostFlag)
            {
                switch (iconType)
                {
                    case MessageBoxIconType::QuestionIcon:  return MB_ICONQUESTION;
                    case MessageBoxIconType::WarningIcon:   return MB_ICONWARNING;
                    case MessageBoxIconType::InfoIcon:      return MB_ICONINFORMATION;
                    case MessageBoxIconType::NoIcon:        break;
                }

                return 0;
            }();

            return static_cast<UINT> (MB_TASKMODAL | MB_SETFOREGROUND | topmostFlag | iconFlags);
        }

        const UINT flags;
        const String title, message;

        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (PreVistaMessageBox)
    };

    class WindowsTaskDialog final : public WindowsMessageBoxBase
    {
        static auto getTaskDialogFunc()
        {
            using TaskDialogIndirectFunc = HRESULT (WINAPI*) (const TASKDIALOGCONFIG*, INT*, INT*, BOOL*);

            static const auto result = [&]() -> TaskDialogIndirectFunc
            {
                const auto comctl = "Comctl32.dll";
                LoadLibraryA (comctl);
                const auto comctlModule = GetModuleHandleA (comctl);

                JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Wcast-function-type")
                if (comctlModule != nullptr)
                    return (TaskDialogIndirectFunc) GetProcAddress (comctlModule, "TaskDialogIndirect");
                JUCE_END_IGNORE_WARNINGS_GCC_LIKE

                return nullptr;
            }();

            return result;
        }

    public:
        explicit WindowsTaskDialog (const MessageBoxOptions& opts)
            : WindowsMessageBoxBase (opts.getAssociatedComponent()),
              iconType (opts.getIconType()),
              title (opts.getTitle()), message (opts.getMessage()),
              buttons { opts.getButtonText (0), opts.getButtonText (1), opts.getButtonText (2) } {}

        static bool isAvailable()
        {
            return getTaskDialogFunc() != nullptr;
        }

    private:
        std::function<int()> getShowMessageBoxForParent (const HWND parent) override
        {
            JUCE_ASSERT_MESSAGE_THREAD

            return [this, parent]
            {
                TASKDIALOGCONFIG config{};

                config.cbSize         = sizeof (config);
                config.hwndParent     = parent;
                config.pszWindowTitle = title.toWideCharPointer();
                config.pszContent     = message.toWideCharPointer();
                config.hInstance      = (HINSTANCE) Process::getCurrentModuleInstanceHandle();
                config.lpCallbackData = reinterpret_cast<LONG_PTR> (this);
                config.pfCallback     = [] (HWND hwnd, UINT msg, WPARAM, LPARAM, LONG_PTR lpRefData)
                {
                    if (auto* t = reinterpret_cast<WindowsTaskDialog*> (lpRefData))
                    {
                        switch (msg)
                        {
                            case TDN_CREATED:
                            case TDN_DIALOG_CONSTRUCTED:
                                t->setDialogWindowHandle (hwnd);
                                break;

                            case TDN_DESTROYED:
                                t->setDialogWindowHandle (nullptr);
                                break;
                        }
                    }

                    return S_OK;
                };

                if (iconType == MessageBoxIconType::QuestionIcon)
                {
                    if (auto* questionIcon = LoadIcon (nullptr, IDI_QUESTION))
                    {
                        config.hMainIcon = questionIcon;
                        config.dwFlags |= TDF_USE_HICON_MAIN;
                    }
                }
                else
                {
                    config.pszMainIcon = [&]() -> LPWSTR
                    {
                        switch (iconType)
                        {
                            case MessageBoxIconType::WarningIcon:   return TD_WARNING_ICON;
                            case MessageBoxIconType::InfoIcon:      return TD_INFORMATION_ICON;

                            case MessageBoxIconType::QuestionIcon:  JUCE_FALLTHROUGH
                            case MessageBoxIconType::NoIcon:
                                break;
                        }

                        return nullptr;
                    }();
                }

                std::vector<TASKDIALOG_BUTTON> buttonLabels;

                for (const auto& buttonText : buttons)
                    if (buttonText.isNotEmpty())
                        buttonLabels.push_back ({ (int) buttonLabels.size(), buttonText.toWideCharPointer() });

                config.pButtons = buttonLabels.data();
                config.cButtons = (UINT) buttonLabels.size();

                int buttonIndex = 0;

                if (auto* func = getTaskDialogFunc())
                    func (&config, &buttonIndex, nullptr, nullptr);
                else
                    jassertfalse;

                return buttonIndex;
            };
        }

        const MessageBoxIconType iconType;
        const String title, message;
        const std::array<String, 3> buttons;

        JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (WindowsTaskDialog)
    };

    if (WindowsTaskDialog::isAvailable())
        return std::make_unique<WindowsTaskDialog> (options);

    const auto extraFlags = [&options]
    {
        const auto numButtons = options.getNumButtons();

        if (numButtons == 3)
            return MB_YESNOCANCEL;

        if (numButtons == 2)
            return options.getButtonText (0) == "OK" ? MB_OKCANCEL
                                                     : MB_YESNO;

        return MB_OK;
    }();

    return std::make_unique<PreVistaMessageBox> (options, (UINT) extraFlags);
}

} // namespace juce::detail
