import
  std/typetraits, preserves, std/tables, std/sets

type
  Path* = seq[string]
  Headers* = TableRef[string, seq[string]]
  Response* {.preservesRecord: "http".} = object
    `handle`*: int
    `code`*: int
    `headers`*: Headers
    `body`*: string

  Handler*[E] {.preservesRecord: "handler".} = ref object
    `methods`*: Methods
    `path`*: Path
    `entity`*: Preserve[E]

  `Method`* {.preservesOr, pure.} = enum
    `GET`, `HEAD`, `POST`, `PUT`, `DELETE`, `CONNECT`, `OPTIONS`, `TRACE`,
    `PATCH`
  Request* {.preservesRecord: "http".} = object
    `handle`*: int
    `method`*: Method
    `headers`*: Headers
    `path`*: Path
    `body`*: string

  Methods* = HashSet[Method]
proc `$`*[E](x: Handler[E]): string =
  `$`(toPreserve(x, E))

proc encode*[E](x: Handler[E]): seq[byte] =
  encode(toPreserve(x, E))

proc `$`*(x: Path | Headers | Response | Request | Methods): string =
  `$`(toPreserve(x))

proc encode*(x: Path | Headers | Response | Request | Methods): seq[byte] =
  encode(toPreserve(x))