#ifndef DAT_H
#define DAT_H

#include <stdint.h>
#include <stddef.h>
#include "keys.h"
#include "sleep_proto.h"

#define DAT_KEY_BYTES 32u
#define DAT_BLOCK_BYTES (64u * 1024u)
#define DAT_URL_BYTES 71u
#define DAT_LINK_BYTES 4096u

typedef struct dat_archive {
	char dat_path[1024];
	uint8_t metadata_key[DAT_KEY_BYTES];
	uint8_t content_key[DAT_KEY_BYTES];
	sleep_keypair_t metadata_keys;
	sleep_keypair_t content_keys;
} dat_archive_t;
typedef struct dat_link {
	uint8_t key[DAT_KEY_BYTES];
	uint64_t version;
	int has_version;
	char path[2048];
} dat_link_t;
typedef struct dat_checkout {
	const dat_archive_t *archive;
	uint64_t version;
} dat_checkout_t;
typedef struct dat_url {
	char host[256];
	char path[2048];
	uint64_t version;
	int has_version;
	int wants_stat;
	int force_directory_listing;
} dat_url_t;
typedef struct dat_path_info {
	sleep_metadata_entry_t entry;
	int exists;
	int is_directory;
} dat_path_info_t;
typedef int (*dat_archive_change_fn)(const sleep_metadata_entry_t *entry,
					     uint64_t version, void *context);
typedef int (*dat_archive_readdir_fn)(const sleep_metadata_entry_t *entry,
				      const char *name, void *context);

/* Creates a new two-feed legacy-style archive skeleton under root/.dat. */
int dat_archive_create(dat_archive_t *archive, const char *root);
int dat_archive_open(dat_archive_t *archive, const char *root);
int dat_archive_open_writable(dat_archive_t *archive, const char *root,
			      const char *secret_directory);
int dat_archive_save_secrets(const dat_archive_t *archive,
			     const char *secret_directory);
void dat_archive_close(dat_archive_t *archive);
size_t dat_archive_entry_count(const dat_archive_t *archive);
uint64_t dat_archive_version(const dat_archive_t *archive);
int dat_archive_append_file(dat_archive_t *archive, const char *path,
			    const uint8_t *data, size_t length,
			    uint32_t mode, uint64_t mtime);
int dat_archive_append_directory(dat_archive_t *archive, const char *path,
				 uint32_t mode, uint64_t mtime);
int dat_archive_append_symlink(dat_archive_t *archive, const char *path,
			       const char *target, uint64_t mtime);
int dat_archive_delete(dat_archive_t *archive, const char *path, uint64_t mtime);
int dat_archive_read_entry(const dat_archive_t *archive, size_t index,
			   sleep_metadata_entry_t *entry);
int dat_archive_read_file(const dat_archive_t *archive,
			  const sleep_metadata_entry_t *entry,
			  uint8_t **data, size_t *length);
int dat_archive_find(const dat_archive_t *archive, const char *path,
		     sleep_metadata_entry_t *entry);
int dat_archive_find_at(const dat_archive_t *archive, const char *path,
			uint64_t version, sleep_metadata_entry_t *entry);
int dat_checkout_init(dat_checkout_t *checkout, const dat_archive_t *archive,
		      uint64_t version);
int dat_checkout_find(const dat_checkout_t *checkout, const char *path,
		      sleep_metadata_entry_t *entry);
int dat_checkout_read(const dat_checkout_t *checkout,
		      const sleep_metadata_entry_t *entry,
		      uint8_t **data, size_t *length);
int dat_checkout_export(const dat_checkout_t *checkout, const char *archive_path,
			const char *filesystem_path);
int dat_archive_changes(const dat_archive_t *archive, uint64_t from_version,
		uint64_t to_version, dat_archive_change_fn callback, void *context);
int dat_archive_stat_at(const dat_archive_t *archive, uint64_t version,
			const char *path, dat_path_info_t *info);
int dat_archive_readdir_at(const dat_archive_t *archive, uint64_t version,
			   const char *path, dat_archive_readdir_fn callback,
			   void *context);
int dat_archive_resolve_at(const dat_archive_t *archive, uint64_t version,
			   const char *path, int force_directory_listing,
			   dat_path_info_t *info, int *serve_directory_listing);
const char *dat_content_type(const char *path);
int dat_url_parse(const char *text, dat_url_t *url);
int dat_archive_import_path(dat_archive_t *archive, const char *filesystem_path,
			    const char *archive_path);
/* Imports only changed paths and records tombstones for paths removed locally. */
int dat_archive_sync_path(dat_archive_t *archive, const char *filesystem_path,
			  const char *archive_path);
int dat_archive_export_path(const dat_archive_t *archive, const char *archive_path,
			    const char *filesystem_path);
int dat_archive_export_at(const dat_archive_t *archive, uint64_t version,
			  const char *archive_path, const char *filesystem_path);
int dat_key_to_url(const uint8_t key[DAT_KEY_BYTES], char url[DAT_URL_BYTES]);
int dat_key_to_compact_url(const uint8_t key[DAT_KEY_BYTES], char url[DAT_URL_BYTES]);
int dat_key_to_hex(const uint8_t key[DAT_KEY_BYTES], char hex[65]);
int dat_url_to_key(const char *url, uint8_t key[DAT_KEY_BYTES]);
int dat_link_format(const dat_link_t *link, char *out, size_t capacity);
int dat_link_format_compact(const dat_link_t *link, char *out, size_t capacity);
int dat_link_parse(const char *text, dat_link_t *link);

#endif /* DAT_H */