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-- Storage Interface API Description
--
-- This is written as a TypedLua description

-- Key-Value stores (the default)

interface keyval_store
	get : ( self, string? ) -> (any) | (nil, string)
	set : ( self, string?, any ) -> (boolean) | (nil, string)
end

-- Map stores (key-key-value stores)

interface map_store
	get : ( self, string?, any ) -> (any) | (nil, string)
	set : ( self, string?, any, any ) -> (boolean) | (nil, string)
	set_keys : ( self, string?, { any : any }) -> (boolean) | (nil, string)
	remove : {}
end

-- Archive stores

typealias archive_query = {
	"start"  : number?, -- timestamp
	"end"    : number?, -- timestamp
	"with"   : string?,
	"after"  : string?, -- archive id
	"before" : string?, -- archive id
	"total"  : boolean?,
}

interface archive_store
	-- Optional set of capabilities
	caps   : {
		-- Optional total count of matching items returned as second return value from :find()
		"total" : boolean?,
	}?

	-- Add to the archive
	append : ( self, string?, string?, any, number?, string? ) -> (string) | (nil, string)

	-- Iterate over archive
	find   : ( self, string?, archive_query? ) -> ( () -> ( string, any, number?, string? ), integer? )

	-- Removal of items. API like find. Optional?
	delete : ( self, string?, archive_query? ) -> (boolean) | (number) | (nil, string)

	-- Array of dates which do have messages (Optional?)
	dates  : ( self, string? ) -> ({ string }) | (nil, string)

	-- Map of counts per "with" field
	summary : ( self, string?, archive_query? ) -> ( { string : integer } ) | (nil, string)
end

-- This represents moduleapi
interface module
	-- If the first string is omitted then the name of the module is used
	-- The second string is one of "keyval" (default), "map" or "archive"
	open_store : (self, string?, string?) -> (keyval_store) | (map_store) | (archive_store) | (nil, string)

	-- Other module methods omitted
end

module : module