//file format "sniff"

pub enum Error{
	Header(HeaderError),
	Map(crate::map::Error),
	Bot(crate::bot::Error),
	Demo(crate::demo::Error),
}

pub enum MissingData{
	NeedExactly(usize),//missing exactly this many bytes
	NeedAtLeast(usize),//missing at least this many bytes
}

pub enum HeaderError{
	InvalidMagic,
	InvalidVersion,
	UnexpectedEOF{
		eof:usize,
		missing_data:MissingData,
	},//file ends in the middle of the header
}

/* spec

//begin global header

//global metadata (32 bytes)
b"SNFB"
u32 format_version
u64 priming_bytes
	//how many bytes of the file must be read to guarantee all of the expected
	//format-specific metadata is available to facilitate streaming the remaining contents
	//used by the database to guarantee that it serves at least the bare minimum
u128 resource_uuid
	//identifies the file from anywhere for any other file

//global block layout (variable size)
u64 num_blocks
for block_id in 0..num_blocks{
	u64 first_byte
}

//end global header

//begin blocks

//each block is compressed with zstd or gz or something

*/

pub enum Magic{
	Map,	//"SNFM"
	Bot,	//"SNFB"
	Demo,	//"SNFD"
	PlaylistDemo,
}

pub struct Header{
	/// Type of file
	magic:Magic,
	/// Type version
	version:u32,
	/// Minimum data required to know the location of all streamable resources for this specific file
	priming:u64,
	/// uuid for this file
	resource:u128,
}

pub struct BlockLayout{
	count:u64,
	location:Vec<u64>,
}

pub enum SNF{
	Map(crate::map::Map),
	Bot(crate::bot::Bot),
	Demo(crate::demo::Demo),
}