#include "steam_overlay.h"

#include <thread>
#include <string>
#include <sstream>
#include <imgui.h>
#include <impls/imgui_impl_win32.h>

#include "../dll/dll.h"

extern LRESULT ImGui_ImplWin32_WndProcHandler(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam);

static decltype(DispatchMessageA)* _DispatchMessageA = DispatchMessageA;
static decltype(DispatchMessageW)* _DispatchMessageW = DispatchMessageW;

LRESULT CALLBACK Steam_Overlay::sHookWndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    return Hook_Manager::Inst().GetOverlay()->HookWndProc(hWnd, uMsg, wParam, lParam);
}

LRESULT Steam_Overlay::HookWndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    // Is the event is a key press
    if (uMsg == WM_KEYDOWN)
    {
        // Tab is pressed and was not pressed before
        if (wParam == VK_TAB && !(lParam & (1 << 30)))
        {
            // If Left Shift is pressed
            if (GetAsyncKeyState(VK_LSHIFT) & (1 << 15))
                ShowOverlay(!show_overlay);
        }

    }
    // If we should show the overlay
    if (show_overlay)
    {
        // Call the overlay window procedure
        ImGui_ImplWin32_WndProcHandler(hWnd, uMsg, wParam, lParam);
        return true;
    }
    // Else call the game window procedure
    return CallWindowProc(game_hwnd_proc, hWnd, uMsg, wParam, lParam);
}

bool Steam_Overlay::IgnoreMsg(const MSG* lpMsg)
{
    if (lpMsg->hwnd == game_hwnd && show_overlay)
    {
        switch (lpMsg->message)
        {
        case WM_MOUSEMOVE:
        case WM_MOUSEWHEEL: case WM_MOUSEHWHEEL:
        case WM_LBUTTONUP: case WM_LBUTTONDOWN: case WM_LBUTTONDBLCLK:
        case WM_RBUTTONUP: case WM_RBUTTONDOWN: case WM_RBUTTONDBLCLK:
        case WM_MBUTTONUP: case WM_MBUTTONDOWN: case WM_MBUTTONDBLCLK:
        case WM_XBUTTONUP: case WM_XBUTTONDOWN: case WM_XBUTTONDBLCLK:
        case WM_KEYDOWN: case WM_KEYUP:
        case WM_SYSKEYDOWN: case WM_SYSKEYUP:
        case WM_CHAR:
            // We ignore theses message in the game windows, but our overlay needs them.
            HookWndProc(lpMsg->hwnd, lpMsg->message, lpMsg->wParam, lpMsg->lParam);
            return true;
        }
    }
    return false;
}

LRESULT WINAPI Steam_Overlay::MyDispatchMessageA(const MSG* lpMsg)
{
    Steam_Overlay* _this = Hook_Manager::Inst().GetOverlay();
    if (_this->IgnoreMsg(lpMsg))
        return 0;
    return _DispatchMessageA(lpMsg);
}

LRESULT WINAPI Steam_Overlay::MyDispatchMessageW(const MSG* lpMsg)
{
    Steam_Overlay* _this = Hook_Manager::Inst().GetOverlay();
    if (_this->IgnoreMsg(lpMsg))
        return 0;
    return _DispatchMessageW(lpMsg);
}

Steam_Overlay::Steam_Overlay(Settings* settings, SteamCallResults* callback_results, SteamCallBacks* callbacks, RunEveryRunCB* run_every_runcb, Networking *network) :
    settings(settings),
    callback_results(callback_results),
    callbacks(callbacks),
    run_every_runcb(run_every_runcb),
    network(network),
    game_hwnd(NULL),
    game_hwnd_proc(nullptr),
    show_overlay(false),
    is_ready(false),
    notif_position(ENotificationPosition::k_EPositionBottomLeft),
    h_inset(0),
    v_inset(0),
    overlay_state_changed(false)
{
    run_every_runcb->add(&Steam_Overlay::steam_overlay_run_every_runcb, this);
}

Steam_Overlay::~Steam_Overlay()
{
    run_every_runcb->remove(&Steam_Overlay::steam_overlay_run_every_runcb, this);
}

void Steam_Overlay::steam_overlay_run_every_runcb(void* object)
{
    Steam_Overlay* _this = reinterpret_cast<Steam_Overlay*>(object);
    _this->RunCallbacks();
}

HWND Steam_Overlay::GetGameHwnd() const
{
    return game_hwnd;
}

bool Steam_Overlay::Ready() const
{
    return is_ready;
}

bool Steam_Overlay::NeedPresent() const
{
    return true;
}

void Steam_Overlay::SetNotificationPosition(ENotificationPosition eNotificationPosition)
{
    notif_position = eNotificationPosition;
}

void Steam_Overlay::SetNotificationInset(int nHorizontalInset, int nVerticalInset)
{
    h_inset = nHorizontalInset;
    v_inset = nVerticalInset;
}

void Steam_Overlay::SetupOverlay()
{
    Hook_Manager::Inst().HookRenderer(this);
}

void Steam_Overlay::HookReady(void* hWnd)
{
    if (game_hwnd != hWnd)
    {
        if (!is_ready) // If this is the first time we are ready, hook the window dispatch message, so we can intercept em and disable mouse.
        {
            window_hooks.BeginHook();
                
            window_hooks.HookFuncs(std::make_pair<void**, void*>(&(PVOID&)_DispatchMessageA, &Steam_Overlay::MyDispatchMessageA),
                                   std::make_pair<void**, void*>(&(PVOID&)_DispatchMessageW, &Steam_Overlay::MyDispatchMessageW)
                                // Add XInput and DirectInput hooks to catch all mouse & controllers input when overlay is on
                                    );

            window_hooks.EndHook();

            is_ready = true;
        }

        if (game_hwnd)
            SetWindowLongPtr(game_hwnd, GWLP_WNDPROC, (LONG_PTR)game_hwnd_proc);

        game_hwnd = (HWND)hWnd;
        game_hwnd_proc = (WNDPROC)SetWindowLongPtr(game_hwnd, GWLP_WNDPROC, (LONG_PTR)&Steam_Overlay::sHookWndProc);
    }
}

// https://niemand.com.ar/2019/01/01/how-to-hook-directx-11-imgui/
// https://github.com/spazzarama/Direct3DHook/blob/master/Capture/Hook
// https://github.com/unknownv2/LinuxDetours

void Steam_Overlay::OpenOverlayInvite(CSteamID lobbyId)
{
    //this->lobbyId = lobbyId;
    ShowOverlay(true);
}

void Steam_Overlay::OpenOverlay(const char* pchDialog)
{
    // TODO: Show pages depending on pchDialog
    ShowOverlay(true);
}

void Steam_Overlay::ShowOverlay(bool state)
{
    static RECT old_clip;

    if (show_overlay == state)
        return;

    show_overlay = state;
    if (show_overlay)
    {
        RECT cliRect, wndRect, clipRect;

        GetClipCursor(&old_clip);
        // The window rectangle has borders and menus counted in the size
        GetWindowRect(game_hwnd, &wndRect);
        // The client rectangle is the window without borders
        GetClientRect(game_hwnd, &cliRect);

        clipRect = wndRect; // Init clip rectangle

        // Get Window width with borders
        wndRect.right -= wndRect.left;
        // Get Window height with borders & menus
        wndRect.bottom -= wndRect.top;
        // Compute the border width
        int borderWidth = (wndRect.right - cliRect.right) / 2;
        // Client top clip is the menu bar width minus bottom border
        clipRect.top += wndRect.bottom - cliRect.bottom - borderWidth;
        // Client left clip is the left border minus border width
        clipRect.left += borderWidth;
        // Here goes the same for right and bottom
        clipRect.right -= borderWidth;
        clipRect.bottom -= borderWidth;

        ClipCursor(&clipRect);

        ImGui::GetIO().MouseDrawCursor = true;
    }
    else
    {
        ClipCursor(&old_clip);
        ImGui::GetIO().MouseDrawCursor = false;
    }
    overlay_state_changed = true;
}

void Steam_Overlay::AddLobbyInvite(Friend friendId, uint64 lobbyId)
{
    std::lock_guard<std::recursive_mutex> lock(global_mutex);
    auto i = friends.find(friendId);
    if (i != friends.end())
    {
        auto& frd = i->second;
        frd.lobbyId = lobbyId;
        frd.window_state |= window_state_lobby_invite;
    }
}

void Steam_Overlay::AddRichInvite(Friend friendId, const char* connect_str)
{
    std::lock_guard<std::recursive_mutex> lock(global_mutex);
    auto i = friends.find(friendId);
    if (i != friends.end())
    {
        auto& frd = i->second;
        strncpy(frd.connect, connect_str, k_cchMaxRichPresenceValueLength - 1);
        frd.window_state |= window_state_rich_invite;
    }
}

void Steam_Overlay::FriendConnect(Friend _friend)
{
    std::lock_guard<std::recursive_mutex> lock(global_mutex);
    friends[_friend].window_state = window_state_none;
}

void Steam_Overlay::FriendDisconnect(Friend _friend)
{
    std::lock_guard<std::recursive_mutex> lock(global_mutex);
    auto it = friends.find(_friend);
    if (it != friends.end())
        friends.erase(it);
}

void Steam_Overlay::OverlayProc( int width, int height )
{
    if (!show_overlay)
        return;

    std::lock_guard<std::recursive_mutex> lock(global_mutex);

    int friend_size = friends.size();

    // Set the overlay windows to the size of the game window
    ImGui::SetNextWindowPos({ 0,0 });
    ImGui::SetNextWindowSize({ static_cast<float>(width),
                               static_cast<float>(height) });

    bool open_overlay = show_overlay;
    if (ImGui::Begin("SteamOverlay", &open_overlay, ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoBringToFrontOnFocus))
    {
        ImGui::LabelText("", "Username: %s(%llu) playing %u",
            settings->get_local_name(),
            settings->get_local_steam_id().ConvertToUint64(),
            settings->get_local_game_id().AppID());

        ImGui::Spacing();

        ImGui::ListBoxHeader("Friends", friend_size);
        std::for_each(friends.begin(), friends.end(), [this]( auto& i)
        {
            ImGui::PushID(i.first.id());
            ImGui::Selectable(i.first.name().c_str(), false, ImGuiSelectableFlags_AllowDoubleClick);
            if (ImGui::BeginPopupContextItem("Friends", 1))
            {
                if (ImGui::Button("Invite"))
                {
                    i.second.window_state |= window_state_invite;
                    this->has_friend_action.push(i.first);
                }
                if (ImGui::Button("Join"))
                {
                    i.second.window_state |= window_state_join;
                    this->has_friend_action.push(i.first);
                }
                ImGui::EndPopup();
            }
            else if (ImGui::IsItemClicked() && ImGui::IsMouseDoubleClicked(0))
            {
                i.second.window_state |= window_state_show;
            }
            ImGui::PopID();

            if (i.second.window_state & window_state_show)
            {
                bool show = true;
                if (ImGui::Begin(i.first.name().c_str(), &show))
                {
                    // Fill this with the chat box and maybe the invitation
                    if (i.second.window_state & (window_state_lobby_invite | window_state_rich_invite))
                    {
                        ImGui::LabelText("", "%s invited you to join the game.", i.first.name().c_str());
                        ImGui::SameLine();
                        if (ImGui::Button("Accept"))
                        {
                            this->has_friend_action.push(i.first);
                        }
                        ImGui::SameLine();
                        if (ImGui::Button("Refuse"))
                        {
                            i.second.window_state &= ~(window_state_lobby_invite | window_state_rich_invite);
                        }
                    }
                }
                // User closed the friend window
                if( !show )
                    i.second.window_state &= ~window_state_show;
                ImGui::End();
            }
        });
        ImGui::ListBoxFooter();

        //RECT rect;
        //GetWindowRect(game_hwnd, &rect);
        //auto pos = ImGui::GetMousePos();
        //ImGui::LabelText("", "Window pos: %dx%d %dx%d", rect.left, rect.top, rect.right, rect.bottom);
        //ImGui::LabelText("", "Mouse pos: %dx%d", (int)pos.x, (int)pos.y);
    }
    ImGui::End();

    ShowOverlay(open_overlay);

    //ImGui::ShowDemoWindow();
}

void Steam_Overlay::RunCallbacks()
{
    if (overlay_state_changed)
    {
        GameOverlayActivated_t data = { 0 };
        data.m_bActive = show_overlay;
        callbacks->addCBResult(data.k_iCallback, &data, sizeof(data));

        overlay_state_changed = false;
    }

    Steam_Friends* steamFriends = get_steam_client()->steam_friends;
    Steam_Matchmaking* steamMatchmaking = get_steam_client()->steam_matchmaking;

    while (!has_friend_action.empty())
    {
        auto friend_info = friends.find(has_friend_action.front());
        if (friend_info != friends.end())
        {
            uint64 friend_id = friend_info->first.id();
            // The user clicked on "Invite"
            if (friend_info->second.window_state & window_state_invite)
            {
                std::string connect = steamFriends->GetFriendRichPresence(settings->get_local_steam_id(), "connect");
                if (connect.length() > 0)
                    steamFriends->InviteUserToGame(friend_id, connect.c_str());
                else if (settings->get_lobby().IsValid())
                    steamMatchmaking->InviteUserToLobby(settings->get_lobby(), friend_id);

                friend_info->second.window_state &= ~window_state_invite;
            }
            // The user clicked on "Join"
            if (friend_info->second.window_state & window_state_join)
            {
                std::string connect = steamFriends->GetFriendRichPresence(friend_id, "connect");
                if (connect.length() > 0)
                {
                    GameRichPresenceJoinRequested_t data = {};
                    data.m_steamIDFriend.SetFromUint64(friend_id);
                    strncpy(data.m_rgchConnect, connect.c_str(), k_cchMaxRichPresenceValueLength - 1);
                    callbacks->addCBResult(data.k_iCallback, &data, sizeof(data));
                }
                else
                {
                    FriendGameInfo_t friend_game_info = {};
                    steamFriends->GetFriendGamePlayed(friend_id, &friend_game_info);
                    if (friend_game_info.m_steamIDLobby.IsValid())
                        steamMatchmaking->JoinLobby(friend_game_info.m_steamIDLobby);
                }

                friend_info->second.window_state &= ~window_state_join;
            }
            // The user got a lobby invite and accepeted it
            if (friend_info->second.window_state & window_state_lobby_invite)
            {
                GameLobbyJoinRequested_t data;
                data.m_steamIDLobby.SetFromUint64(friend_info->second.lobbyId);
                data.m_steamIDFriend.SetFromUint64(friend_id);
                callbacks->addCBResult(data.k_iCallback, &data, sizeof(data));

                friend_info->second.window_state &= ~window_state_lobby_invite;
            }
            // The user got a rich presence invite and accepeted it
            if (friend_info->second.window_state & window_state_rich_invite)
            {
                GameRichPresenceJoinRequested_t data = {};
                data.m_steamIDFriend.SetFromUint64(friend_id);
                strncpy(data.m_rgchConnect, friend_info->second.connect, k_cchMaxRichPresenceValueLength - 1);
                callbacks->addCBResult(data.k_iCallback, &data, sizeof(data));

                friend_info->second.window_state &= ~window_state_rich_invite;
            }
        }
        has_friend_action.pop();
    }
}