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#ifndef PODBOAT_QUEUELOADER_H_
#define PODBOAT_QUEUELOADER_H_
#include <functional>
#include <vector>
#include "3rd-party/optional.hpp"
#include "configcontainer.h"
#include "download.h"
namespace podboat {
/// Synchronizes Podboat's array of downloads with the queue file on the
/// filesystem.
class QueueLoader {
public:
/// Create a loader that will work with the queue file at \a filepath.
/// `Download` objects will be given \a cb_require_view_update as an
/// argument.
QueueLoader(const std::string& filepath, const newsboat::ConfigContainer& cfg,
std::function<void()> cb_require_view_update);
/// Synchronize the queue file with \a downloads. Downloads with `DELETED`
/// status are removed. If \a also_remove_finished is `true`, `FINISHED`
/// downloads are removed too.
void reload(std::vector<Download>& downloads,
bool also_remove_finished = false) const;
private:
std::string get_filename(const std::string& str) const;
const std::string queuefile;
const newsboat::ConfigContainer& cfg;
std::function<void()> cb_require_view_update;
/// A helper type for methods that process the queue file.
struct CategorizedDownloads {
/// Downloads that should be kept in the queue file.
std::vector<Download> to_keep;
/// Downloads that should be deleted from the queue file.
std::vector<Download> to_delete;
};
/// Splits downloads into "to keep" and "to delete" categories depending on
/// their status.
///
/// If `also_remove_finished` is `true`, downloads with `FINISHED` status
/// are put into "to delete" category.
///
/// Returns:
/// - nullopt if one of the downloads is currently being downloaded;
/// - otherwise, a struct with categorized downloads.
static nonstd::optional<CategorizedDownloads> categorize_downloads(
const std::vector<Download>& downloads, bool also_remove_finished);
/// Adds downloads from the queue file to the "to keep" category.
void update_from_queue_file(CategorizedDownloads& downloads) const;
/// Writes "to keep" downloads to the queue file.
void write_queue_file(const CategorizedDownloads& downloads) const;
/// If `delete-played-files` is enabled, deletes downloaded files
/// corresponding to downloads in the "to delete" category.
void delete_played_files(const CategorizedDownloads& downloads) const;
};
} // namespace podboat
#endif /* PODBOAT_QUEUELOADER_H_ */
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