#ifndef ZBLOCK_FEED_INFO_H
#define ZBLOCK_FEED_INFO_H

#include <concord/discord.h>

#include <postgresql/libpq-fe.h>

typedef struct {
	char *url;
	char *last_pubDate;
	u64snowflake channel_id;
} zblock_feed_info_minimal;

typedef struct {
	// same definition as feed_info_minimal
	char *url;
	char *last_pubDate;
	u64snowflake channel_id;
	// extra things
	char *title;
	u64snowflake guild_id;
} zblock_feed_info;

typedef enum {
	ZBLOCK_FEED_INFO_OK,
	ZBLOCK_FEED_INFO_INVALID_ARGS,
	ZBLOCK_FEED_INFO_DBERROR,
	ZBLOCK_FEED_INFO_EXISTS,
	ZBLOCK_FEED_INFO_NOT_EXIST,
	ZBLOCK_FEED_INFO_FINISHED,
	ZBLOCK_FEED_INFO_NOMEM,
	ZBLOCK_FEED_INFO_ERRORCOUNT
} zblock_feed_info_err;

// free all information associated with a minimal feed info struct (does not assume the struct was allocated using malloc)
void zblock_feed_info_minimal_free(zblock_feed_info_minimal *feed_info);

// free all information associated with a feed info struct (does not assume the struct was allocated using malloc)
void zblock_feed_info_free(zblock_feed_info *feed_info);

// maybe change the function signature so you can actually do error handling with the result?
time_t pubDate_to_time_t(char *s);

// returns a string about the result of a feed_info function
const char *zblock_feed_info_strerror(zblock_feed_info_err error);

// Begin retrieval of feed info objects.
zblock_feed_info_err zblock_feed_info_retrieve_list_begin(PGconn *conn);

// Retrieve the next feed list object.
// On error, no more objects can be retrieved and the returned object is invalid.
zblock_feed_info_err zblock_feed_info_retrieve_list_item(PGconn *conn, zblock_feed_info_minimal *feed_info);

// check if the feed currently exists. the result is in the exists pointer.
zblock_feed_info_err zblock_feed_info_exists(PGconn *conn, const char *url, u64snowflake channel_id, int *exists);

// Insert new feed into the database
zblock_feed_info_err zblock_feed_info_insert(PGconn *conn, zblock_feed_info *feed);

// deletes feed from the database
zblock_feed_info_err zblock_feed_info_delete(PGconn *conn, const char *url, u64snowflake channel_id);

// deletes all feeds associated with a guild from the database
zblock_feed_info_err zblock_feed_info_delete_all_guild(PGconn *conn, u64snowflake guild_id);

// updates the last_pubDate field of a given feed in the database
zblock_feed_info_err zblock_feed_info_update(PGconn *conn, zblock_feed_info_minimal *feed);

// returns the number of feeds in a channel in count
zblock_feed_info_err zblock_feed_info_count_channel(PGconn *conn, u64snowflake channel_id, int64_t *count);

// returns a chunk of feeds for the given channel in the array provided by chunk.
// assumes chunk was preallocated with the number of elements in size
// num_retrieved is an optional parameter that will contain the number of feeds actually retrieved (in case it is less)
zblock_feed_info_err zblock_feed_info_retrieve_chunk_channel(PGconn *conn, u64snowflake channel_id, uint64_t offset, size_t size, zblock_feed_info *chunk, int *num_retrieved);

#endif