;; Phase 8 FFI BIF tests — one round-trip per BIF.
;; Each BIF lives in lib/erlang/runtime.sx (registered with
;; er-bif-registry) and wraps an SX-host primitive.

(define er-ffi-test-count 0)
(define er-ffi-test-pass 0)
(define er-ffi-test-fails (list))

(define
  er-ffi-test
  (fn
    (name actual expected)
    (set! er-ffi-test-count (+ er-ffi-test-count 1))
    (if
      (= actual expected)
      (set! er-ffi-test-pass (+ er-ffi-test-pass 1))
      (append! er-ffi-test-fails {:name name :expected expected :actual actual}))))

(define ffi-ev erlang-eval-ast)
(define ffi-nm (fn (v) (get v :name)))

;; ── file:read_file/1 + file:write_file/2 ────────────────────────
(er-ffi-test
  "file:write_file ok"
  (ffi-nm (ffi-ev "file:write_file(\"/tmp/er-ffi-1.txt\", \"hello\")"))
  "ok")

(er-ffi-test
  "file:read_file ok tag"
  (ffi-nm (ffi-ev "element(1, file:read_file(\"/tmp/er-ffi-1.txt\"))"))
  "ok")

(er-ffi-test
  "file:read_file payload is binary"
  (ffi-nm
    (ffi-ev
      "case file:read_file(\"/tmp/er-ffi-1.txt\") of {ok, B} -> is_binary(B) end"))
  "true")

(er-ffi-test
  "file:read_file content byte_size"
  (ffi-ev
    "case file:read_file(\"/tmp/er-ffi-1.txt\") of {ok, B} -> byte_size(B) end")
  5)

(er-ffi-test
  "file:read_file missing enoent"
  (ffi-nm (ffi-ev "element(2, file:read_file(\"/tmp/er-ffi-no-such-xyz\"))"))
  "enoent")

(er-ffi-test
  "file:write_file bad path enoent"
  (ffi-nm
    (ffi-ev "element(2, file:write_file(\"/tmp/er-ffi-no-dir-xyz/x\", \"y\"))"))
  "enoent")

(er-ffi-test
  "file:write_file binary payload"
  (ffi-ev
    "file:write_file(\"/tmp/er-ffi-2.bin\", <<1, 2, 3, 4, 5>>), case file:read_file(\"/tmp/er-ffi-2.bin\") of {ok, B} -> byte_size(B) end")
  5)

;; ── file:delete/1 ────────────────────────────────────────────────
(er-ffi-test
  "file:delete ok"
  (ffi-nm
    (ffi-ev
      "file:write_file(\"/tmp/er-ffi-del.txt\", \"x\"), file:delete(\"/tmp/er-ffi-del.txt\")"))
  "ok")

(er-ffi-test
  "file:read_file after delete enoent"
  (ffi-nm
    (ffi-ev
      "file:write_file(\"/tmp/er-ffi-del2.txt\", \"x\"), file:delete(\"/tmp/er-ffi-del2.txt\"), element(2, file:read_file(\"/tmp/er-ffi-del2.txt\"))"))
  "enoent")

;; ── Blocked BIFs (placeholder asserts so the suite documents intent) ──
;; crypto:hash/2, cid:from_bytes/1, cid:to_string/1, file:list_dir/1,
;; httpc:request/4, sqlite:* — documented in plans/erlang-on-sx.md
;; under Blockers. When the host runtime gains the underlying primitive,
;; the wrappers land in runtime.sx and tests appear here. For now we
;; assert each is NOT registered, so a future iteration that adds them
;; without updating this file fails fast.

(er-ffi-test
  "crypto:hash unregistered"
  (er-lookup-bif "crypto" "hash" 2)
  nil)

(er-ffi-test
  "cid:from_bytes unregistered"
  (er-lookup-bif "cid" "from_bytes" 1)
  nil)

(er-ffi-test
  "file:list_dir unregistered"
  (er-lookup-bif "file" "list_dir" 1)
  nil)

(er-ffi-test
  "httpc:request unregistered"
  (er-lookup-bif "httpc" "request" 4)
  nil)

(er-ffi-test
  "sqlite:exec unregistered"
  (er-lookup-bif "sqlite" "exec" 2)
  nil)

(define
  er-ffi-test-summary
  (str "ffi " er-ffi-test-pass "/" er-ffi-test-count))