;; show.sx — tests for the Show / Read class plumbing.
;;
;; Covers Phase 8:
;;  - showsPrec / showParen / shows / showString stubs
;;  - Read class stubs (reads / readsPrec / read)
;;  - direct show coverage (Int, Bool, String, list, tuple, Maybe, ADT, ...)

;; ── ShowS / showsPrec / showParen stubs ──────────────────────
(hk-test
  "shows: prepends show output"
  (hk-deep-force (hk-run "main = shows 5 \"abc\""))
  "5abc")

(hk-test
  "shows: works on True"
  (hk-deep-force (hk-run "main = shows True \"x\""))
  "Truex")

(hk-test
  "showString: prepends literal"
  (hk-deep-force (hk-run "main = showString \"hello\" \" world\""))
  "hello world")

(hk-test
  "showParen True: wraps inner output in parens"
  (hk-deep-force (hk-run "main = showParen True (showString \"inside\") \"\""))
  "(inside)")

(hk-test
  "showParen False: passes through unchanged"
  (hk-deep-force (hk-run "main = showParen False (showString \"inside\") \"\""))
  "inside")

(hk-test
  "showsPrec: prepends show output regardless of prec"
  (hk-deep-force (hk-run "main = showsPrec 11 42 \"end\""))
  "42end")

(hk-test
  "showParen + manual composition: build (Just 3)"
  (hk-deep-force
    (hk-run
      "buildJust3 s = showString \"Just \" (shows 3 s)\nmain = showParen True buildJust3 \"\""))
  "(Just 3)")

;; ── Read stubs ───────────────────────────────────────────────
(hk-test
  "reads: stub returns empty list (null-check)"
  (hk-deep-force (hk-run "main = show (null (reads \"42\"))"))
  "True")

(hk-test
  "readsPrec: stub returns empty list"
  (hk-deep-force (hk-run "main = show (null (readsPrec 0 \"True\"))"))
  "True")

(hk-test
  "reads: type-checks in expression context (length)"
  (hk-deep-force (hk-run "main = show (length (reads \"abc\"))"))
  "0")

;; ── Direct `show` audit coverage ─────────────────────────────
(hk-test "show Int" (hk-deep-force (hk-run "main = show 42")) "42")

(hk-test
  "show negative Int"
  (hk-deep-force (hk-run "main = show (negate 5)"))
  "-5")

(hk-test "show Bool True" (hk-deep-force (hk-run "main = show True")) "True")

(hk-test
  "show Bool False"
  (hk-deep-force (hk-run "main = show False"))
  "False")

(hk-test
  "show String quotes the value"
  (hk-deep-force (hk-run "main = show \"hello\""))
  "\"hello\"")

(hk-test
  "show list of Int"
  (hk-deep-force (hk-run "main = show [1,2,3]"))
  "[1,2,3]")

(hk-test
  "show empty list"
  (hk-deep-force (hk-run "main = show (drop 5 [1,2,3])"))
  "[]")

(hk-test
  "show pair tuple"
  (hk-deep-force (hk-run "main = show (1, True)"))
  "(1,True)")

(hk-test
  "show triple tuple"
  (hk-deep-force (hk-run "main = show (1, 2, 3)"))
  "(1,2,3)")

(hk-test
  "show Maybe Nothing"
  (hk-deep-force (hk-run "main = show Nothing"))
  "Nothing")

(hk-test
  "show Maybe Just"
  (hk-deep-force (hk-run "main = show (Just 3)"))
  "Just 3")

(hk-test
  "show nested Just wraps inner in parens"
  (hk-deep-force (hk-run "main = show (Just (Just 3))"))
  "Just (Just 3)")

(hk-test
  "show Just (negate 3) wraps negative in parens"
  (hk-deep-force (hk-run "main = show (Just (negate 3))"))
  "Just (-3)")

(hk-test
  "show custom nullary ADT"
  (hk-deep-force
    (hk-run "data Day = Mon | Tue | Wed deriving (Show)\nmain = show Tue"))
  "Tue")

(hk-test
  "show custom multi-constructor ADT"
  (hk-deep-force
    (hk-run
      "data Shape = Pt | Sq Int | Rect Int Int deriving (Show)\nmain = show (Rect 3 4)"))
  "Rect 3 4")

(hk-test
  "show list of Maybe wraps each element"
  (hk-deep-force (hk-run "main = show [Just 1, Nothing, Just 2]"))
  "[Just 1,Nothing,Just 2]")

{:fails hk-test-fails :pass hk-test-pass :fail hk-test-fail}