#ifndef BLUELIB_IO_FILE_H_
#define BLUELIB_IO_FILE_H_

#include <blue/core/error.h>
#include <blue/core/misc.h>
#include <blue/core/stream.h>
#include <blue/ds/object.h>

#define B_FILE(p)        ((b_file *)(p))

#define B_OFFSET_CURRENT ((size_t) - 1)

struct b_directory;
struct b_path;

typedef enum b_seek_basis {
	B_SEEK_BEGINNING,
	B_SEEK_CURRENT,
	B_SEEK_END
} b_seek_basis;

typedef enum b_file_attribute {
	B_FILE_ATTRIB_NORMAL = 0x01u,
	B_FILE_ATTRIB_DIRECTORY = 0x02u,
	B_FILE_ATTRIB_BLOCK_DEVICE = 0x04u,
	B_FILE_ATTRIB_CHAR_DEVICE = 0x08u,
	B_FILE_ATTRIB_SYMLINK = 0x80u,
} b_file_attribute;

typedef enum b_file_mode {
	B_FILE_READ_ONLY = 0x01u,
	B_FILE_WRITE_ONLY = 0x02u,
	B_FILE_READ_WRITE = B_FILE_READ_ONLY | B_FILE_WRITE_ONLY,
	B_FILE_TRUNCATE = 0x04u,
	B_FILE_CREATE = 0x08u,
	B_FILE_CREATE_ONLY = 0x10u | B_FILE_CREATE,
	B_FILE_APPEND = 0x20u,
	B_FILE_BINARY = 0x40u,
	B_FILE_DELETE_ON_CLOSE = 0x80u,
	B_FILE_SHADOW = 0x100u,
} b_file_mode;

typedef struct b_file_info {
	b_file_attribute attrib;
	b_file_mode mode;

	size_t length;
} b_file_info;

typedef struct b_file b_file;

BLUE_API b_result b_file_open(
	struct b_directory *root, const struct b_path *path, b_file_mode mode,
	b_file **out);
BLUE_API b_result b_file_open_temp(b_file_mode mode, b_file **out);
BLUE_API b_result b_file_open_shadow(
	b_file *original, b_file_mode mode, b_file **out);

BLUE_API b_status b_file_open_stream(b_file *file, b_stream **out);
BLUE_API b_status b_file_stat(b_file *file, b_file_info *out);
BLUE_API b_status b_file_size(b_file *file, size_t *out_len);
BLUE_API b_status b_file_cursor(b_file *file, size_t *out_pos);
BLUE_API b_status b_file_resize(b_file *file, size_t len);
BLUE_API b_status b_file_seek(b_file *file, long long offset, b_seek_basis basis);

BLUE_API b_status b_file_swap_shadow(b_file *main_file, b_file *shadow_file);

BLUE_API b_status b_file_read(
	b_file *file, size_t offset, size_t len, void *buf, size_t *nr_read);
BLUE_API b_status b_file_write(
	b_file *file, size_t offset, size_t len, const void *buf,
	size_t *nr_written);

static inline b_file *b_file_retain(b_file *file)
{
	return B_FILE(b_retain(B_DSREF(file)));
}
static inline void b_file_release(b_file *file)
{
	b_release(B_DSREF(file));
}

#endif