/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org

Telegram Desktop 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 3 of the License, or
(at your option) any later version.

It 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.

In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.

Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#pragma once

#include "data/data_types.h"

inline uint64 mediaMix32To64(int32 a, int32 b) {
	return (uint64(*reinterpret_cast<uint32*>(&a)) << 32)
		| uint64(*reinterpret_cast<uint32*>(&b));
}

// Old method, should not be used anymore.
//inline MediaKey mediaKey(LocationType type, int32 dc, const uint64 &id) {
//	return MediaKey(mediaMix32To64(type, dc), id);
//}
// New method when version was introduced, type is not relevant anymore (all files are Documents).
inline MediaKey mediaKey(
		LocationType type,
		int32 dc,
		const uint64 &id,
		int32 version) {
	return (version > 0) ? MediaKey(mediaMix32To64(version, dc), id) : MediaKey(mediaMix32To64(type, dc), id);
}

inline StorageKey mediaKey(const MTPDfileLocation &location) {
	return storageKey(
		location.vdc_id.v,
		location.vvolume_id.v,
		location.vlocal_id.v);
}

struct DocumentAdditionalData {
	virtual ~DocumentAdditionalData() = default;

};

struct StickerData : public DocumentAdditionalData {
	ImagePtr img;
	QString alt;

	MTPInputStickerSet set = MTP_inputStickerSetEmpty();
	bool setInstalled() const;

	StorageImageLocation loc; // doc thumb location

};

struct SongData : public DocumentAdditionalData {
	int32 duration = 0;
	QString title, performer;

};

struct VoiceData : public DocumentAdditionalData {
	~VoiceData();

	int duration = 0;
	VoiceWaveform waveform;
	char wavemax = 0;
};

bool fileIsImage(const QString &name, const QString &mime);

namespace Serialize {
class Document;
} // namespace Serialize;

class DocumentData {
public:
	static DocumentData *create(DocumentId id);
	static DocumentData *create(
		DocumentId id,
		int32 dc,
		uint64 accessHash,
		int32 version,
		const QVector<MTPDocumentAttribute> &attributes);
	static DocumentData *create(
		DocumentId id,
		const QString &url,
		const QVector<MTPDocumentAttribute> &attributes);

	void setattributes(
		const QVector<MTPDocumentAttribute> &attributes);

	void automaticLoad(const HistoryItem *item); // auto load sticker or video
	void automaticLoadSettingsChanged();

	enum FilePathResolveType {
		FilePathResolveCached,
		FilePathResolveChecked,
		FilePathResolveSaveFromData,
		FilePathResolveSaveFromDataSilent,
	};
	bool loaded(
		FilePathResolveType type = FilePathResolveCached) const;
	bool loading() const;
	QString loadingFilePath() const;
	bool displayLoading() const;
	void save(
		const QString &toFile,
		ActionOnLoad action = ActionOnLoadNone,
		const FullMsgId &actionMsgId = FullMsgId(),
		LoadFromCloudSetting fromCloud = LoadFromCloudOrLocal,
		bool autoLoading = false);
	void cancel();
	float64 progress() const;
	int32 loadOffset() const;
	bool uploading() const;

	QByteArray data() const;
	const FileLocation &location(bool check = false) const;
	void setLocation(const FileLocation &loc);

	QString filepath(
		FilePathResolveType type = FilePathResolveCached,
		bool forceSavingAs = false) const;

	bool saveToCache() const;

	void performActionOnLoad();

	void forget();
	ImagePtr makeReplyPreview();

	StickerData *sticker() {
		return (type == StickerDocument)
			? static_cast<StickerData*>(_additional.get())
			: nullptr;
	}
	void checkSticker() {
		StickerData *s = sticker();
		if (!s) return;

		automaticLoad(nullptr);
		if (s->img->isNull() && loaded()) {
			if (_data.isEmpty()) {
				const FileLocation &loc(location(true));
				if (loc.accessEnable()) {
					s->img = ImagePtr(loc.name());
					loc.accessDisable();
				}
			} else {
				s->img = ImagePtr(_data);
			}
		}
	}
	SongData *song() {
		return (type == SongDocument)
			? static_cast<SongData*>(_additional.get())
			: nullptr;
	}
	const SongData *song() const {
		return const_cast<DocumentData*>(this)->song();
	}
	VoiceData *voice() {
		return (type == VoiceDocument)
			? static_cast<VoiceData*>(_additional.get())
			: nullptr;
	}
	const VoiceData *voice() const {
		return const_cast<DocumentData*>(this)->voice();
	}
	bool isRoundVideo() const {
		return (type == RoundVideoDocument);
	}
	bool isAnimation() const {
		return (type == AnimatedDocument)
			|| isRoundVideo()
			|| hasMimeType(qstr("image/gif"));
	}
	bool isGifv() const {
		return (type == AnimatedDocument)
			&& hasMimeType(qstr("video/mp4"));
	}
	bool isTheme() const {
		return
			_filename.endsWith(
				qstr(".tdesktop-theme"),
				Qt::CaseInsensitive)
			|| _filename.endsWith(
				qstr(".tdesktop-palette"),
				Qt::CaseInsensitive);
	}
	bool tryPlaySong() const {
		return (song() != nullptr)
			|| _mimeString.startsWith(
				qstr("audio/"),
				Qt::CaseInsensitive);
	}
	bool isMusic() const {
		if (auto s = song()) {
			return (s->duration > 0);
		}
		return false;
	}
	bool isVideo() const {
		return (type == VideoDocument);
	}
	int32 duration() const {
		return (isAnimation() || isVideo()) ? _duration : -1;
	}
	bool isImage() const {
		return !isAnimation() && !isVideo() && (_duration > 0);
	}
	void recountIsImage();
	void setData(const QByteArray &data) {
		_data = data;
	}

	bool setRemoteVersion(int32 version); // Returns true if version has changed.
	void setRemoteLocation(int32 dc, uint64 access);
	void setContentUrl(const QString &url);
	bool hasRemoteLocation() const {
		return (_dc != 0 && _access != 0);
	}
	bool isValid() const {
		return hasRemoteLocation() || !_url.isEmpty();
	}
	MTPInputDocument mtpInput() const {
		if (_access) {
			return MTP_inputDocument(
				MTP_long(id),
				MTP_long(_access));
		}
		return MTP_inputDocumentEmpty();
	}

	// When we have some client-side generated document
	// (for example for displaying an external inline bot result)
	// and it has downloaded data, we can collect that data from it
	// to (this) received from the server "same" document.
	void collectLocalData(DocumentData *local);

	QString filename() const {
		return _filename;
	}
	QString mimeString() const {
		return _mimeString;
	}
	bool hasMimeType(QLatin1String mime) const {
		return !_mimeString.compare(mime, Qt::CaseInsensitive);
	}
	void setMimeString(const QString &mime) {
		_mimeString = mime;
	}

	~DocumentData();

	DocumentId id = 0;
	DocumentType type = FileDocument;
	QSize dimensions;
	int32 date = 0;
	ImagePtr thumb, replyPreview;
	int32 size = 0;

	FileStatus status = FileReady;
	int32 uploadOffset = 0;

	int32 md5[8];

	MediaKey mediaKey() const {
		return ::mediaKey(locationType(), _dc, id, _version);
	}

	static QString ComposeNameString(
		const QString &filename,
		const QString &songTitle,
		const QString &songPerformer);
	QString composeNameString() const {
		if (auto songData = song()) {
			return ComposeNameString(
				_filename,
				songData->title,
				songData->performer);
		}
		return ComposeNameString(_filename, QString(), QString());
	}

private:
	DocumentData(
		DocumentId id,
		int32 dc,
		uint64 accessHash,
		int32 version,
		const QString &url,
		const QVector<MTPDocumentAttribute> &attributes);

	friend class Serialize::Document;

	LocationType locationType() const {
		return voice()
			? AudioFileLocation
			: isVideo()
				? VideoFileLocation
				: DocumentFileLocation;
	}

	// Two types of location: from MTProto by dc+access+version or from web by url
	int32 _dc = 0;
	uint64 _access = 0;
	int32 _version = 0;
	QString _url;
	QString _filename;
	QString _mimeString;

	FileLocation _location;
	QByteArray _data;
	std::unique_ptr<DocumentAdditionalData> _additional;
	int32 _duration = -1;

	ActionOnLoad _actionOnLoad = ActionOnLoadNone;
	FullMsgId _actionOnLoadMsgId;
	mutable FileLoader *_loader = nullptr;

	void notifyLayoutChanged() const;

	void destroyLoaderDelayed(
		mtpFileLoader *newValue = nullptr) const;

};

VoiceWaveform documentWaveformDecode(const QByteArray &encoded5bit);
QByteArray documentWaveformEncode5bit(const VoiceWaveform &waveform);

class DocumentClickHandler : public LeftButtonClickHandler {
public:
	DocumentClickHandler(DocumentData *document)
	: _document(document) {
	}
	DocumentData *document() const {
		return _document;
	}

private:
	DocumentData *_document;

};

class DocumentSaveClickHandler : public DocumentClickHandler {
public:
	using DocumentClickHandler::DocumentClickHandler;
	static void doSave(
		DocumentData *document,
		bool forceSavingAs = false);

protected:
	void onClickImpl() const override;

};

class DocumentOpenClickHandler : public DocumentClickHandler {
public:
	using DocumentClickHandler::DocumentClickHandler;
	static void doOpen(
		DocumentData *document,
		HistoryItem *context,
		ActionOnLoad action = ActionOnLoadOpen);

protected:
	void onClickImpl() const override;

};

class DocumentCancelClickHandler : public DocumentClickHandler {
public:
	using DocumentClickHandler::DocumentClickHandler;

protected:
	void onClickImpl() const override;

};

class GifOpenClickHandler : public DocumentOpenClickHandler {
public:
	using DocumentOpenClickHandler::DocumentOpenClickHandler;

protected:
	void onClickImpl() const override;

};

class VoiceSeekClickHandler : public DocumentOpenClickHandler {
public:
	using DocumentOpenClickHandler::DocumentOpenClickHandler;

protected:
	void onClickImpl() const override {
	}

};

QString saveFileName(
	const QString &title,
	const QString &filter,
	const QString &prefix,
	QString name,
	bool savingAs,
	const QDir &dir = QDir());