(* Copyright (c) 2024-2026 Thomas Gazagnaire <thomas@gazagnaire.org>

   Permission to use, copy, modify, and distribute this software for any
   purpose with or without fee is hereby granted, provided that the above
   copyright notice and this permission notice appear in all copies.

   THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *)

let hash = Test_helpers.hash

let test_roundtrip () =
  let content = "test content" in
  let blob = Git.Blob.of_string content in
  let value = Git.Value.blob blob in
  let s = Git.Value.to_string value in
  match Git.Value.of_string_with_header s with
  | Ok value' -> (
      match value' with
      | Git.Value.Blob b ->
          Alcotest.(check string) "content" content (Git.Blob.to_string b)
      | _ -> Alcotest.fail "expected blob")
  | Error (`Msg m) -> Alcotest.fail m

let test_bytesrw_roundtrip () =
  let content = "bytesrw test content" in
  let blob = Git.Blob.of_string content in
  let value = Git.Value.blob blob in
  (* Write to buffer *)
  let buf = Buffer.create 64 in
  let writer = Bytesrw.Bytes.Writer.of_buffer buf in
  Git.Value.write writer value;
  let written = Buffer.contents buf in
  (* Read back *)
  let reader = Bytesrw.Bytes.Reader.of_string written in
  match Git.Value.read reader with
  | Ok value' -> (
      match value' with
      | Git.Value.Blob b ->
          Alcotest.(check string) "content" content (Git.Blob.to_string b)
      | _ -> Alcotest.fail "expected blob")
  | Error (`Msg m) -> Alcotest.fail m

let test_bytesrw_commit () =
  let tree_hash = Git.Hash.of_hex "da39a3ee5e6b4b0d3255bfef95601890afd80709" in
  let author =
    Git.User.v ~name:"Alice" ~email:"alice@example.com" ~date:1234567890L ()
  in
  let commit =
    Git.Commit.v ~tree:tree_hash ~author ~committer:author
      (Some "Test commit\n")
  in
  let value = Git.Value.commit commit in
  (* Write to buffer *)
  let buf = Buffer.create 256 in
  let writer = Bytesrw.Bytes.Writer.of_buffer buf in
  Git.Value.write writer value;
  let written = Buffer.contents buf in
  (* Read back *)
  let reader = Bytesrw.Bytes.Reader.of_string written in
  match Git.Value.read reader with
  | Ok value' -> (
      match value' with
      | Git.Value.Commit c ->
          Alcotest.(check hash) "tree" tree_hash (Git.Commit.tree c);
          Alcotest.(check (option string))
            "message" (Some "Test commit\n") (Git.Commit.message c)
      | _ -> Alcotest.fail "expected commit")
  | Error (`Msg m) -> Alcotest.fail m

let tests =
  [
    Alcotest.test_case "roundtrip" `Quick test_roundtrip;
    Alcotest.test_case "bytesrw_roundtrip" `Quick test_bytesrw_roundtrip;
    Alcotest.test_case "bytesrw_commit" `Quick test_bytesrw_commit;
  ]

let suite = ("value", tests)