/******************************************************************************
    Copyright (C) 2023 by Lain Bailey <lain@obsproject.com>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/

#include "platform.hpp"

#include <OBSApp.hpp>

#include <util/windows/ComPtr.hpp>
#include <util/windows/WinHandle.hpp>
#include <util/windows/win-version.h>

#include <Dwmapi.h>
#include <audiopolicy.h>
#include <mmdeviceapi.h>
#include <shellapi.h>
#include <shlobj.h>
#include <sstream>
#define WIN32_LEAN_AND_MEAN
#include <windows.h>

using namespace std;

extern bool portable_mode;
extern int GetConfigPath(char *path, size_t size, const char *name);

static inline bool check_path(const char *data, const char *path, string &output)
{
	ostringstream str;
	str << path << data;
	output = str.str();

	blog(LOG_DEBUG, "Attempted path: %s", output.c_str());

	return os_file_exists(output.c_str());
}

bool GetDataFilePath(const char *data, string &output)
{
	if (check_path(data, "data/obs-studio/", output)) {
		return true;
	}

	return check_path(data, OBS_DATA_PATH "/obs-studio/", output);
}

string GetDefaultVideoSavePath()
{
	wchar_t path_utf16[MAX_PATH];
	char path_utf8[MAX_PATH] = {};

	SHGetFolderPathW(NULL, CSIDL_MYVIDEO, NULL, SHGFP_TYPE_CURRENT, path_utf16);

	os_wcs_to_utf8(path_utf16, wcslen(path_utf16), path_utf8, MAX_PATH);
	return string(path_utf8);
}

static vector<string> GetUserPreferredLocales()
{
	vector<string> result;

	ULONG num, length = 0;
	if (!GetUserPreferredUILanguages(MUI_LANGUAGE_NAME, &num, nullptr, &length)) {
		return result;
	}

	vector<wchar_t> buffer(length);
	if (!GetUserPreferredUILanguages(MUI_LANGUAGE_NAME, &num, &buffer.front(), &length)) {
		return result;
	}

	result.reserve(num);
	auto start = begin(buffer);
	auto end_ = end(buffer);
	decltype(start) separator;
	while ((separator = find(start, end_, 0)) != end_) {
		if (result.size() == num) {
			break;
		}

		char conv[MAX_PATH] = {};
		os_wcs_to_utf8(&*start, separator - start, conv, MAX_PATH);

		result.emplace_back(conv);

		start = separator + 1;
	}

	return result;
}

vector<string> GetPreferredLocales()
{
	vector<string> windows_locales = GetUserPreferredLocales();
	auto obs_locales = GetLocaleNames();
	auto windows_to_obs = [&obs_locales](string windows) {
		string lang_match;

		for (auto &locale_pair : obs_locales) {
			auto &locale = locale_pair.first;
			if (locale == windows.substr(0, locale.size())) {
				return locale;
			}

			if (lang_match.size()) {
				continue;
			}

			if (locale.substr(0, 2) == windows.substr(0, 2)) {
				lang_match = locale;
			}
		}

		return lang_match;
	};

	vector<string> result;
	result.reserve(obs_locales.size());

	for (const string &locale : windows_locales) {
		string match = windows_to_obs(locale);
		if (!match.size()) {
			continue;
		}

		if (find(begin(result), end(result), match) != end(result)) {
			continue;
		}

		result.emplace_back(match);
	}

	return result;
}

uint32_t GetWindowsVersion()
{
	static uint32_t ver = 0;

	if (ver == 0) {
		struct win_version_info ver_info;

		get_win_ver(&ver_info);
		ver = (ver_info.major << 8) | ver_info.minor;
	}

	return ver;
}

uint32_t GetWindowsBuild()
{
	static uint32_t build = 0;

	if (build == 0) {
		struct win_version_info ver_info;

		get_win_ver(&ver_info);
		build = ver_info.build;
	}

	return build;
}

bool IsAlwaysOnTop(QWidget *window)
{
	DWORD exStyle = GetWindowLong((HWND)window->winId(), GWL_EXSTYLE);
	return (exStyle & WS_EX_TOPMOST) != 0;
}

void SetAlwaysOnTop(QWidget *window, bool enable)
{
	HWND hwnd = (HWND)window->winId();
	SetWindowPos(hwnd, enable ? HWND_TOPMOST : HWND_NOTOPMOST, 0, 0, 0, 0,
		     SWP_NOMOVE | SWP_NOSIZE | SWP_NOACTIVATE);
}

void SetProcessPriority(const char *priority)
{
	if (!priority) {
		return;
	}

	if (strcmp(priority, "High") == 0) {
		SetPriorityClass(GetCurrentProcess(), HIGH_PRIORITY_CLASS);
	} else if (strcmp(priority, "AboveNormal") == 0) {
		SetPriorityClass(GetCurrentProcess(), ABOVE_NORMAL_PRIORITY_CLASS);
	} else if (strcmp(priority, "Normal") == 0) {
		SetPriorityClass(GetCurrentProcess(), NORMAL_PRIORITY_CLASS);
	} else if (strcmp(priority, "BelowNormal") == 0) {
		SetPriorityClass(GetCurrentProcess(), BELOW_NORMAL_PRIORITY_CLASS);
	} else if (strcmp(priority, "Idle") == 0) {
		SetPriorityClass(GetCurrentProcess(), IDLE_PRIORITY_CLASS);
	}
}

void SetWin32DropStyle(QWidget *window)
{
	HWND hwnd = (HWND)window->winId();
	LONG_PTR ex_style = GetWindowLongPtr(hwnd, GWL_EXSTYLE);
	ex_style |= WS_EX_ACCEPTFILES;
	SetWindowLongPtr(hwnd, GWL_EXSTYLE, ex_style);
}

bool SetDisplayAffinitySupported(void)
{
	static bool checked = false;
	static bool supported;

	/* this has to be version gated as setting WDA_EXCLUDEFROMCAPTURE on
	   older Windows builds behaves like WDA_MONITOR (black box) */

	if (!checked) {
		if (GetWindowsVersion() > 0x0A00 || GetWindowsVersion() == 0x0A00 && GetWindowsBuild() >= 19041) {
			supported = true;
		} else {
			supported = false;
		}

		checked = true;
	}

	return supported;
}

bool DisableAudioDucking(bool disable)
{
	ComPtr<IMMDeviceEnumerator> devEmum;
	ComPtr<IMMDevice> device;
	ComPtr<IAudioSessionManager2> sessionManager2;
	ComPtr<IAudioSessionControl> sessionControl;
	ComPtr<IAudioSessionControl2> sessionControl2;

	HRESULT result = CoCreateInstance(__uuidof(MMDeviceEnumerator), nullptr, CLSCTX_INPROC_SERVER,
					  __uuidof(IMMDeviceEnumerator), (void **)&devEmum);
	if (FAILED(result)) {
		return false;
	}

	result = devEmum->GetDefaultAudioEndpoint(eRender, eConsole, &device);
	if (FAILED(result)) {
		return false;
	}

	result = device->Activate(__uuidof(IAudioSessionManager2), CLSCTX_INPROC_SERVER, nullptr,
				  (void **)&sessionManager2);
	if (FAILED(result)) {
		return false;
	}

	result = sessionManager2->GetAudioSessionControl(nullptr, 0, &sessionControl);
	if (FAILED(result)) {
		return false;
	}

	result = sessionControl->QueryInterface(&sessionControl2);
	if (FAILED(result)) {
		return false;
	}

	result = sessionControl2->SetDuckingPreference(disable);
	return SUCCEEDED(result);
}

struct RunOnceMutexData {
	WinHandle handle;

	inline RunOnceMutexData(HANDLE h) : handle(h) {}
};

RunOnceMutex::RunOnceMutex(RunOnceMutex &&rom)
{
	delete data;
	data = rom.data;
	rom.data = nullptr;
}

RunOnceMutex::~RunOnceMutex()
{
	delete data;
}

RunOnceMutex &RunOnceMutex::operator=(RunOnceMutex &&rom)
{
	delete data;
	data = rom.data;
	rom.data = nullptr;
	return *this;
}

RunOnceMutex CheckIfAlreadyRunning(bool &already_running)
{
	string name;

	if (!portable_mode) {
		name = "OBSStudioCore";
	} else {
		char path[500];
		char absPath[512];
		*path = 0;
		*absPath = 0;
		GetAppConfigPath(path, sizeof(path), "");
		os_get_abs_path(path, absPath, sizeof(absPath));
		name = "OBSStudioPortable";
		name += absPath;
	}

	BPtr<wchar_t> wname;
	os_utf8_to_wcs_ptr(name.c_str(), name.size(), &wname);

	if (wname) {
		wchar_t *temp = wname;
		while (*temp) {
			if (!iswalnum(*temp)) {
				*temp = L'_';
			}
			temp++;
		}
	}

	HANDLE h = OpenMutexW(SYNCHRONIZE, false, wname.Get());
	already_running = !!h;

	if (!already_running) {
		h = CreateMutexW(nullptr, false, wname.Get());
	}

	RunOnceMutex rom(h ? new RunOnceMutexData(h) : nullptr);
	return rom;
}

struct MonitorData {
	const wchar_t *id;
	MONITORINFOEX info;
	bool found;
};

static BOOL CALLBACK GetMonitorCallback(HMONITOR monitor, HDC, LPRECT, LPARAM param)
{
	MonitorData *data = (MonitorData *)param;

	if (GetMonitorInfoW(monitor, &data->info)) {
		if (wcscmp(data->info.szDevice, data->id) == 0) {
			data->found = true;
			return false;
		}
	}

	return true;
}

/* Based on https://www.winehq.org/pipermail/wine-devel/2008-September/069387.html */
typedef const char *(CDECL *WINEGETVERSION)(void);
bool IsRunningOnWine()
{
	WINEGETVERSION func;
	HMODULE nt;

	nt = GetModuleHandleW(L"ntdll");
	if (!nt) {
		return false;
	}

	func = (WINEGETVERSION)GetProcAddress(nt, "wine_get_version");
	if (func) {
		blog(LOG_WARNING, "Running on Wine version \"%s\"", func());
		return true;
	}

	return false;
}

HWND hwnd;
void TaskbarOverlayInit()
{
	hwnd = (HWND)App()->GetMainWindow()->winId();
}

void TaskbarOverlaySetStatus(TaskbarOverlayStatus status)
{
	ITaskbarList4 *taskbarIcon;
	auto hr = CoCreateInstance(CLSID_TaskbarList, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&taskbarIcon));

	if (FAILED(hr)) {
		taskbarIcon->Release();
		return;
	}

	hr = taskbarIcon->HrInit();

	if (FAILED(hr)) {
		taskbarIcon->Release();
		return;
	}

	QIcon qicon;
	switch (status) {
	case TaskbarOverlayStatusActive:
		qicon = QIcon::fromTheme("obs-active", QIcon(":/res/images/active.png"));
		break;
	case TaskbarOverlayStatusPaused:
		qicon = QIcon::fromTheme("obs-paused", QIcon(":/res/images/paused.png"));
		break;
	case TaskbarOverlayStatusInactive:
		taskbarIcon->SetOverlayIcon(hwnd, nullptr, nullptr);
		taskbarIcon->Release();
		return;
	}

	HICON hicon = nullptr;
	if (!qicon.isNull()) {
		Q_GUI_EXPORT HICON qt_pixmapToWinHICON(const QPixmap &p);
		hicon = qt_pixmapToWinHICON(qicon.pixmap(GetSystemMetrics(SM_CXSMICON)));
		if (!hicon) {
			return;
		}
	}

	taskbarIcon->SetOverlayIcon(hwnd, hicon, nullptr);
	DestroyIcon(hicon);
	taskbarIcon->Release();
}

bool HighContrastEnabled()
{
	HIGHCONTRAST hc = {};
	hc.cbSize = sizeof(HIGHCONTRAST);

	if (SystemParametersInfo(SPI_GETHIGHCONTRAST, hc.cbSize, &hc, 0)) {
		return hc.dwFlags & HCF_HIGHCONTRASTON;
	}

	return false;
}
