/*

Copyright (c) 2009-2018, Arvid Norberg
All rights reserved.

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    * Redistributions in binary form must reproduce the above copyright
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      from this software without specific prior written permission.

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*/

#ifndef TORRENT_ADD_TORRENT_PARAMS_HPP_INCLUDED
#define TORRENT_ADD_TORRENT_PARAMS_HPP_INCLUDED

#include <string>
#include <vector>
#include <map>
#include <functional>
#include <ctime>

#include "libtorrent/storage_defs.hpp"
#include "libtorrent/sha1_hash.hpp"
#include "libtorrent/version.hpp"
#include "libtorrent/socket.hpp" // for tcp::endpoint
#include "libtorrent/bitfield.hpp"
#include "libtorrent/error_code.hpp"
#include "libtorrent/units.hpp"
#include "libtorrent/torrent_flags.hpp"
#include "libtorrent/download_priority.hpp"
#include "libtorrent/aux_/noexcept_movable.hpp"

namespace libtorrent {

	class torrent_info;
	struct torrent_plugin;
	struct torrent_handle;

TORRENT_VERSION_NAMESPACE_2

	// The add_torrent_params is a parameter pack for adding torrents to a
	// session. The key fields when adding a torrent are:
	//
	// * ti - when you have loaded a .torrent file into a torrent_info object
	// * info_hash - when you don't have the metadata (.torrent file) but. This
	//   is set when adding a magnet link.
	//
	// one of those fields must be set. Another mandatory field is
	// ``save_path``. The add_torrent_params object is passed into one of the
	// ``session::add_torrent()`` overloads or ``session::async_add_torrent()``.
	//
	// If you only specify the info-hash, the torrent file will be downloaded
	// from peers, which requires them to support the metadata extension. For
	// the metadata extension to work, libtorrent must be built with extensions
	// enabled (``TORRENT_DISABLE_EXTENSIONS`` must not be defined). It also
	// takes an optional ``name`` argument. This may be left empty in case no
	// name should be assigned to the torrent. In case it's not, the name is
	// used for the torrent as long as it doesn't have metadata. See
	// ``torrent_handle::name``.
	//
	// The ``add_torrent_params`` is also used when requesting resume data for a
	// torrent. It can be saved to and restored from a file and added back to a
	// new session. For serialization and de-serialization of
	// ``add_torrent_params`` objects, see read_resume_data() and
	// write_resume_data().
#include "libtorrent/aux_/disable_warnings_push.hpp"
	struct TORRENT_EXPORT add_torrent_params
	{
		// The constructor can be used to initialize the storage constructor,
		// which determines the storage mechanism for the downloaded or seeding
		// data for the torrent. For more information, see the ``storage`` field.
		explicit add_torrent_params(storage_constructor_type sc = default_storage_constructor);
		add_torrent_params(add_torrent_params&&) noexcept;
		add_torrent_params& operator=(add_torrent_params&&) = default;
		add_torrent_params(add_torrent_params const&);
		add_torrent_params& operator=(add_torrent_params const&);

		// These are all deprecated. use torrent_flags_t instead (in
		// libtorrent/torrent_flags.hpp)
#if TORRENT_ABI_VERSION == 1

		using flags_t = torrent_flags_t;

#define DECL_FLAG(name) \
		static constexpr torrent_flags_t TORRENT_DEPRECATED_MEMBER flag_##name = torrent_flags::name

			DECL_FLAG(seed_mode);
			DECL_FLAG(upload_mode);
			DECL_FLAG(share_mode);
			DECL_FLAG(apply_ip_filter);
			DECL_FLAG(paused);
			DECL_FLAG(auto_managed);
			DECL_FLAG(duplicate_is_error);
			DECL_FLAG(update_subscribe);
			DECL_FLAG(super_seeding);
			DECL_FLAG(sequential_download);
			DECL_FLAG(pinned);
			DECL_FLAG(stop_when_ready);
			DECL_FLAG(override_trackers);
			DECL_FLAG(override_web_seeds);
			DECL_FLAG(need_save_resume);
			DECL_FLAG(override_resume_data);
			DECL_FLAG(merge_resume_trackers);
			DECL_FLAG(use_resume_save_path);
			DECL_FLAG(merge_resume_http_seeds);
			DECL_FLAG(default_flags);
#undef DECL_FLAG
#endif // TORRENT_ABI_VERSION

#include "libtorrent/aux_/disable_warnings_pop.hpp"

		// filled in by the constructor and should be left untouched. It is used
		// for forward binary compatibility.
		int version = LIBTORRENT_VERSION_NUM;

		// torrent_info object with the torrent to add. Unless the
		// info_hash is set, this is required to be initialized.
		std::shared_ptr<torrent_info> ti;

		// If the torrent doesn't have a tracker, but relies on the DHT to find
		// peers, the ``trackers`` can specify tracker URLs for the torrent.
		aux::noexcept_movable<std::vector<std::string>> trackers;

		// the tiers the URLs in ``trackers`` belong to. Trackers belonging to
		// different tiers may be treated differently, as defined by the multi
		// tracker extension. This is optional, if not specified trackers are
		// assumed to be part of tier 0, or whichever the last tier was as
		// iterating over the trackers.
		aux::noexcept_movable<std::vector<int>> tracker_tiers;

		// a list of hostname and port pairs, representing DHT nodes to be added
		// to the session (if DHT is enabled). The hostname may be an IP address.
		aux::noexcept_movable<std::vector<std::pair<std::string, int>>> dht_nodes;

		// in case there's no other name in this torrent, this name will be used.
		// The name out of the torrent_info object takes precedence if available.
		std::string name;

		// the path where the torrent is or will be stored.
		//
		// .. note::
		// 	On windows this path (and other paths) are interpreted as UNC
		// 	paths. This means they must use backslashes as directory separators
		// 	and may not contain the special directories "." or "..".
		//
		// Setting this to an absolute path performs slightly better than a
		// relative path.
		std::string save_path;

		// One of the values from storage_mode_t. For more information, see
		// storage-allocation_.
		storage_mode_t storage_mode = storage_mode_sparse;

		// can be used to customize how the data is stored. The default storage
		// will simply write the data to the files it belongs to, but it could be
		// overridden to save everything to a single file at a specific location
		// or encrypt the content on disk for instance. For more information
		// about the storage_interface that needs to be implemented for a custom
		// storage, see storage_interface.
		aux::noexcept_movable<storage_constructor_type> storage;

		// The ``userdata`` parameter is optional and will be passed on to the
		// extension constructor functions, if any
		// (see torrent_handle::add_extension()). It will also be possible to
		// retrieve via torrent_handle::userdata().
		void* userdata = nullptr;

		// can be set to control the initial file priorities when adding a
		// torrent. The semantics are the same as for
		// ``torrent_handle::prioritize_files()``. The file priorities specified
		// in here take precedence over those specified in the resume data, if
		// any.
		aux::noexcept_movable<std::vector<download_priority_t>> file_priorities;

		// torrent extension construction functions can be added to this vector
		// to have them be added immediately when the torrent is constructed.
		// This may be desired over the torrent_handle::add_extension() in order
		// to avoid race conditions. For instance it may be important to have the
		// plugin catch events that happen very early on after the torrent is
		// created.
		aux::noexcept_movable<std::vector<std::function<std::shared_ptr<torrent_plugin>(torrent_handle const&, void*)>>>
			extensions;

		// the default tracker id to be used when announcing to trackers. By
		// default this is empty, and no tracker ID is used, since this is an
		// optional argument. If a tracker returns a tracker ID, that ID is used
		// instead of this.
		std::string trackerid;

		// flags controlling aspects of this torrent and how it's added. See
		// torrent_flags_t for details.
		//
		// .. note::
		// 	The ``flags`` field is initialized with default flags by the
		// 	constructor. In order to preserve default behavior when clearing or
		// 	setting other flags, make sure to bitwise OR or in a flag or bitwise
		// 	AND the inverse of a flag to clear it.
		torrent_flags_t flags = torrent_flags::default_flags;

		// set this to the info hash of the torrent to add in case the info-hash
		// is the only known property of the torrent. i.e. you don't have a
		// .torrent file nor a magnet link.
		// To add a magnet link, use parse_magnet_uri() to populate fields in the
		// add_torrent_params object.
		sha1_hash info_hash;

		// ``max_uploads``, ``max_connections``, ``upload_limit``,
		// ``download_limit`` correspond to the ``set_max_uploads()``,
		// ``set_max_connections()``, ``set_upload_limit()`` and
		// ``set_download_limit()`` functions on torrent_handle. These values let
		// you initialize these settings when the torrent is added, instead of
		// calling these functions immediately following adding it.
		//
		// -1 means unlimited on these settings just like their counterpart
		// functions on torrent_handle
		//
		// For fine grained control over rate limits, including making them apply
		// to local peers, see peer-classes_.
		int max_uploads = -1;
		int max_connections = -1;

		// the upload and download rate limits for this torrent, specified in
		// bytes per second. -1 means unlimited.
		int upload_limit = -1;
		int download_limit = -1;

		// the total number of bytes uploaded and downloaded by this torrent so
		// far.
		std::int64_t total_uploaded = 0;
		std::int64_t total_downloaded = 0;

		// the number of seconds this torrent has spent in started, finished and
		// seeding state so far, respectively.
		int active_time = 0;
		int finished_time = 0;
		int seeding_time = 0;

		// if set to a non-zero value, this is the posix time of when this torrent
		// was first added, including previous runs/sessions. If set to zero, the
		// internal added_time will be set to the time of when add_torrent() is
		// called.
		std::time_t added_time = 0;
		std::time_t completed_time = 0;

		// if set to non-zero, initializes the time (expressed in posix time) when
		// we last saw a seed or peers that together formed a complete copy of the
		// torrent. If left set to zero, the internal counterpart to this field
		// will be updated when we see a seed or a distributed copies >= 1.0.
		std::time_t last_seen_complete = 0;

		// these field can be used to initialize the torrent's cached scrape data.
		// The scrape data is high level metadata about the current state of the
		// swarm, as returned by the tracker (either when announcing to it or by
		// sending a specific scrape request). ``num_complete`` is the number of
		// peers in the swarm that are seeds, or have every piece in the torrent.
		// ``num_incomplete`` is the number of peers in the swarm that do not have
		// every piece. ``num_downloaded`` is the number of times the torrent has
		// been downloaded (not initiated, but the number of times a download has
		// completed).
		//
		// Leaving any of these values set to -1 indicates we don't know, or we
		// have not received any scrape data.
		int num_complete = -1;
		int num_incomplete = -1;
		int num_downloaded = -1;

		// URLs can be added to these two lists to specify additional web
		// seeds to be used by the torrent. If the ``flag_override_web_seeds``
		// is set, these will be the _only_ ones to be used. i.e. any web seeds
		// found in the .torrent file will be overridden.
		//
		// http_seeds expects URLs to web servers implementing the original HTTP
		// seed specification `BEP 17`_.
		//
		// url_seeds expects URLs to regular web servers, aka "get right" style,
		// specified in `BEP 19`_.
		aux::noexcept_movable<std::vector<std::string>> http_seeds;
		aux::noexcept_movable<std::vector<std::string>> url_seeds;

		// peers to add to the torrent, to be tried to be connected to as
		// bittorrent peers.
		aux::noexcept_movable<std::vector<tcp::endpoint>> peers;

		// peers banned from this torrent. The will not be connected to
		aux::noexcept_movable<std::vector<tcp::endpoint>> banned_peers;

		// this is a map of partially downloaded piece. The key is the piece index
		// and the value is a bitfield where each bit represents a 16 kiB block.
		// A set bit means we have that block.
		aux::noexcept_movable<std::map<piece_index_t, bitfield>> unfinished_pieces;

		// this is a bitfield indicating which pieces we already have of this
		// torrent.
		typed_bitfield<piece_index_t> have_pieces;

		// when in seed_mode, pieces with a set bit in this bitfield have been
		// verified to be valid. Other pieces will be verified the first time a
		// peer requests it.
		typed_bitfield<piece_index_t> verified_pieces;

		// this sets the priorities for each individual piece in the torrent. Each
		// element in the vector represent the piece with the same index. If you
		// set both file- and piece priorities, file priorities will take
		// precedence.
		aux::noexcept_movable<std::vector<download_priority_t>> piece_priorities;

		// if this is a merkle tree torrent, and you're seeding, this field must
		// be set. It is all the hashes in the binary tree, with the root as the
		// first entry. See torrent_info::set_merkle_tree() for more info.
		aux::noexcept_movable<std::vector<sha1_hash>> merkle_tree;

		// this is a map of file indices in the torrent and new filenames to be
		// applied before the torrent is added.
		aux::noexcept_movable<std::map<file_index_t, std::string>> renamed_files;

		// the posix time of the last time payload was received or sent for this
		// torrent, respectively.
		std::time_t last_download = 0;
		std::time_t last_upload = 0;

#if TORRENT_ABI_VERSION == 1
		// deprecated in 1.2

		// ``url`` can be set to a magnet link, in order to download the .torrent
		// file (also known as the metadata), specifically the info-dictionary,
		// from the bittorrent swarm. This may require access to the DHT, in case
		// the magnet link does not come with trackers.
		//
		// In earlier versions of libtorrent, the URL could be an HTTP or file://
		// url. These uses are deprecated and discouraged. When adding a torrent
		// by magnet link, it will be set to the ``downloading_metadata`` state
		// until the .torrent file has been downloaded. If there is any error
		// while downloading, the torrent will be stopped and the torrent error
		// state (``torrent_status::error``) will indicate what went wrong.
		std::string TORRENT_DEPRECATED_MEMBER url;

		// if ``uuid`` is specified, it is used to find duplicates. If another
		// torrent is already running with the same UUID as the one being added,
		// it will be considered a duplicate. This is mainly useful for RSS feed
		// items which has UUIDs specified.
		std::string TORRENT_DEPRECATED_MEMBER uuid;

		// The optional parameter, ``resume_data`` can be given if up to date
		// fast-resume data is available. The fast-resume data can be acquired
		// from a running torrent by calling save_resume_data() on
		// torrent_handle. See fast-resume_. The ``vector`` that is passed in
		// will be swapped into the running torrent instance with
		// ``std::vector::swap()``.
		aux::noexcept_movable<std::vector<char>> TORRENT_DEPRECATED_MEMBER resume_data;

		// to support the deprecated use case of reading the resume data into
		// resume_data field and getting a reject alert, any parse failure is
		// communicated forward into libtorrent via this field. If this is set, a
		// fastresume_rejected_alert will be posted.
		error_code internal_resume_data_error;
#endif // TORRENT_ABI_VERSION

	};

TORRENT_VERSION_NAMESPACE_2_END

namespace aux {
	bool contains_resume_data(add_torrent_params const&);
}

}

#endif
