#include <QDragEnterEvent>
#include <QDragLeaveEvent>
#include <QDragMoveEvent>
#include <QDropEvent>
#include <QFileInfo>
#include <QMimeData>
#include <QUrlQuery>
#ifdef _WIN32
#include <QSettings>
#endif
#include <string>
#include <qt-wrappers.hpp>

#include "window-basic-main.hpp"

using namespace std;

static const char *textExtensions[] = {"txt", "log", nullptr};

static const char *imageExtensions[] = {"bmp", "gif", "jpeg", "jpg",
#ifdef _WIN32
					"jxr",
#endif
					"png", "tga", "webp", nullptr};

static const char *htmlExtensions[] = {"htm", "html", nullptr};

static const char *mediaExtensions[] = {
	"3ga", "669",  "a52", "aac",  "ac3",   "adt",   "adts",  "aif",  "aifc", "aiff", "amb",  "amr",  "aob", "ape",
	"au",  "awb",  "caf", "dts",  "flac",  "it",    "kar",   "m4a",  "m4b",  "m4p",  "m5p",  "mid",  "mka", "mlp",
	"mod", "mpa",  "mp1", "mp2",  "mp3",   "mpc",   "mpga",  "mus",  "oga",  "ogg",  "oma",  "opus", "qcp", "ra",
	"rmi", "s3m",  "sid", "spx",  "tak",   "thd",   "tta",   "voc",  "vqf",  "w64",  "wav",  "wma",  "wv",  "xa",
	"xm",  "3g2",  "3gp", "3gp2", "3gpp",  "amv",   "asf",   "avi",  "bik",  "crf",  "divx", "drc",  "dv",  "evo",
	"f4v", "flv",  "gvi", "gxf",  "iso",   "m1v",   "m2v",   "m2t",  "m2ts", "m4v",  "mkv",  "mov",  "mp2", "mp2v",
	"mp4", "mp4v", "mpe", "mpeg", "mpeg1", "mpeg2", "mpeg4", "mpg",  "mpv2", "mts",  "mtv",  "mxf",  "mxg", "nsv",
	"nuv", "ogg",  "ogm", "ogv",  "ogx",   "ps",    "rec",   "rm",   "rmvb", "rpl",  "thp",  "tod",  "ts",  "tts",
	"txd", "vob",  "vro", "webm", "wm",    "wmv",   "wtv",   nullptr};

static string GenerateSourceName(const char *base)
{
	string name;
	int inc = 0;

	for (;; inc++) {
		name = base;

		if (inc) {
			name += " (";
			name += to_string(inc + 1);
			name += ")";
		}

		OBSSourceAutoRelease source = obs_get_source_by_name(name.c_str());

		if (!source)
			return name;
	}
}

#ifdef _WIN32
static QString ReadWindowsURLFile(const QString &file)
{
	QSettings iniFile(file, QSettings::IniFormat);
	QVariant url = iniFile.value("InternetShortcut/URL");
	return url.toString();
}
#endif

void OBSBasic::AddDropURL(const char *url, QString &name, obs_data_t *settings, const obs_video_info &ovi)
{
	QUrl path = QString::fromUtf8(url);
	QUrlQuery query = QUrlQuery(path.query(QUrl::FullyEncoded));

	int cx = (int)ovi.base_width;
	int cy = (int)ovi.base_height;

	if (query.hasQueryItem("layer-width"))
		cx = query.queryItemValue("layer-width").toInt();
	if (query.hasQueryItem("layer-height"))
		cy = query.queryItemValue("layer-height").toInt();
	if (query.hasQueryItem("layer-css")) {
		// QUrl::FullyDecoded does NOT properly decode a
		// application/x-www-form-urlencoded space represented as '+'
		// Thus, this is manually filtered out before QUrl's
		// decoding kicks in again. This is to allow JavaScript's
		// default searchParams.append function to simply append css
		// to the query parameters, which is the intended usecase for this.
		QString fullyEncoded = query.queryItemValue("layer-css", QUrl::FullyEncoded);
		fullyEncoded = fullyEncoded.replace("+", "%20");
		QString decoded = QUrl::fromPercentEncoding(QByteArray::fromStdString(QT_TO_UTF8(fullyEncoded)));
		obs_data_set_string(settings, "css", QT_TO_UTF8(decoded));
	}

	obs_data_set_int(settings, "width", cx);
	obs_data_set_int(settings, "height", cy);

	name = query.hasQueryItem("layer-name") ? query.queryItemValue("layer-name", QUrl::FullyDecoded) : path.host();

	query.removeQueryItem("layer-width");
	query.removeQueryItem("layer-height");
	query.removeQueryItem("layer-name");
	query.removeQueryItem("layer-css");
	path.setQuery(query);

	obs_data_set_string(settings, "url", QT_TO_UTF8(path.url()));
}

void OBSBasic::AddDropSource(const char *data, DropType image)
{
	OBSBasic *main = reinterpret_cast<OBSBasic *>(App()->GetMainWindow());
	OBSDataAutoRelease settings = obs_data_create();
	const char *type = nullptr;
	QString name;

	obs_video_info ovi;
	obs_get_video_info(&ovi);

	switch (image) {
	case DropType_RawText:
		obs_data_set_string(settings, "text", data);
#ifdef _WIN32
		type = "text_gdiplus";
#else
		type = "text_ft2_source";
#endif
		break;
	case DropType_Text:
#ifdef _WIN32
		obs_data_set_bool(settings, "read_from_file", true);
		obs_data_set_string(settings, "file", data);
		name = QUrl::fromLocalFile(QString(data)).fileName();
		type = "text_gdiplus";
#else
		obs_data_set_bool(settings, "from_file", true);
		obs_data_set_string(settings, "text_file", data);
		type = "text_ft2_source";
#endif
		break;
	case DropType_Image:
		obs_data_set_string(settings, "file", data);
		name = QUrl::fromLocalFile(QString(data)).fileName();
		type = "image_source";
		break;
	case DropType_Media:
		obs_data_set_string(settings, "local_file", data);
		name = QUrl::fromLocalFile(QString(data)).fileName();
		type = "ffmpeg_source";
		break;
	case DropType_Html:
		obs_data_set_bool(settings, "is_local_file", true);
		obs_data_set_string(settings, "local_file", data);
		obs_data_set_int(settings, "width", ovi.base_width);
		obs_data_set_int(settings, "height", ovi.base_height);
		name = QUrl::fromLocalFile(QString(data)).fileName();
		type = "browser_source";
		break;
	case DropType_Url:
		AddDropURL(data, name, settings, ovi);
		type = "browser_source";
		break;
	}

	type = obs_get_latest_input_type_id(type);

	if (type == nullptr || !obs_source_get_display_name(type)) {
		return;
	}

	if (name.isEmpty())
		name = obs_source_get_display_name(type);
	std::string sourceName = GenerateSourceName(QT_TO_UTF8(name));
	OBSSourceAutoRelease source = obs_source_create(type, sourceName.c_str(), settings, nullptr);
	if (source) {
		OBSDataAutoRelease wrapper = obs_save_source(source);

		OBSScene scene = main->GetCurrentScene();
		std::string sceneUUID = obs_source_get_uuid(obs_scene_get_source(scene));
		std::string sourceUUID = obs_source_get_uuid(source);

		auto undo = [sceneUUID, sourceUUID](const std::string &) {
			OBSSourceAutoRelease source = obs_get_source_by_uuid(sourceUUID.c_str());
			obs_source_remove(source);
			OBSSourceAutoRelease scene = obs_get_source_by_uuid(sceneUUID.c_str());
			OBSBasic::Get()->SetCurrentScene(scene.Get(), true);
		};
		auto redo = [sceneUUID, sourceName, type](const std::string &data) {
			OBSSourceAutoRelease scene = obs_get_source_by_uuid(sceneUUID.c_str());
			OBSBasic::Get()->SetCurrentScene(scene.Get(), true);

			OBSDataAutoRelease dat = obs_data_create_from_json(data.c_str());
			OBSSourceAutoRelease source = obs_load_source(dat);
			obs_scene_add(obs_scene_from_source(scene), source.Get());
		};

		undo_s.add_action(QTStr("Undo.Add").arg(sourceName.c_str()), undo, redo, "",
				  std::string(obs_data_get_json(wrapper)));
		obs_scene_add(scene, source);
	}
}

void OBSBasic::dragEnterEvent(QDragEnterEvent *event)
{
	// refuse drops of our own widgets
	if (event->source() != nullptr) {
		event->setDropAction(Qt::IgnoreAction);
		return;
	}

	event->acceptProposedAction();
}

void OBSBasic::dragLeaveEvent(QDragLeaveEvent *event)
{
	event->accept();
}

void OBSBasic::dragMoveEvent(QDragMoveEvent *event)
{
	event->acceptProposedAction();
}

void OBSBasic::ConfirmDropUrl(const QString &url)
{
	if (url.left(7).compare("http://", Qt::CaseInsensitive) == 0 ||
	    url.left(8).compare("https://", Qt::CaseInsensitive) == 0) {

		activateWindow();

		QString msg = QTStr("AddUrl.Text");
		msg += "\n\n";
		msg += QTStr("AddUrl.Text.Url").arg(url);

		QMessageBox messageBox(this);
		messageBox.setWindowTitle(QTStr("AddUrl.Title"));
		messageBox.setText(msg);

		QPushButton *yesButton = messageBox.addButton(QTStr("Yes"), QMessageBox::YesRole);
		QPushButton *noButton = messageBox.addButton(QTStr("No"), QMessageBox::NoRole);
		messageBox.setDefaultButton(yesButton);
		messageBox.setEscapeButton(noButton);
		messageBox.setIcon(QMessageBox::Question);
		messageBox.exec();

		if (messageBox.clickedButton() == yesButton)
			AddDropSource(QT_TO_UTF8(url), DropType_Url);
	}
}

void OBSBasic::dropEvent(QDropEvent *event)
{
	const QMimeData *mimeData = event->mimeData();

	if (mimeData->hasUrls()) {
		QList<QUrl> urls = mimeData->urls();

		for (int i = 0; i < urls.size(); i++) {
			QUrl url = urls[i];
			QString file = url.toLocalFile();
			QFileInfo fileInfo(file);

			if (!fileInfo.exists()) {
				ConfirmDropUrl(url.url());
				continue;
			}

#ifdef _WIN32
			if (fileInfo.suffix().compare("url", Qt::CaseInsensitive) == 0) {
				QString urlTarget = ReadWindowsURLFile(file);
				if (!urlTarget.isEmpty()) {
					ConfirmDropUrl(urlTarget);
				}
				continue;
			} else if (fileInfo.isShortcut()) {
				file = fileInfo.symLinkTarget();
				fileInfo = QFileInfo(file);
				if (!fileInfo.exists()) {
					continue;
				}
			}
#endif

			QString suffixQStr = fileInfo.suffix();
			QByteArray suffixArray = suffixQStr.toUtf8();
			const char *suffix = suffixArray.constData();
			bool found = false;

			const char **cmp;

#define CHECK_SUFFIX(extensions, type)                         \
	cmp = extensions;                                      \
	while (*cmp) {                                         \
		if (astrcmpi(*cmp, suffix) == 0) {             \
			AddDropSource(QT_TO_UTF8(file), type); \
			found = true;                          \
			break;                                 \
		}                                              \
                                                               \
		cmp++;                                         \
	}                                                      \
                                                               \
	if (found)                                             \
		continue;

			CHECK_SUFFIX(textExtensions, DropType_Text);
			CHECK_SUFFIX(htmlExtensions, DropType_Html);
			CHECK_SUFFIX(imageExtensions, DropType_Image);
			CHECK_SUFFIX(mediaExtensions, DropType_Media);

#undef CHECK_SUFFIX
		}
	} else if (mimeData->hasText()) {
		AddDropSource(QT_TO_UTF8(mimeData->text()), DropType_RawText);
	}
}