#!/usr/bin/env bash
# next/tests/http_capabilities.sh — Step 8c-cap acceptance test.
#
# Exercises GET /.well-known/sx-capabilities — kernel-version
# descriptor per design §16. The path is exposed as
# http_server:capabilities_path/0 so tests don't have to spell
# it byte-by-byte. 7 cases.

set -uo pipefail
cd "$(git rev-parse --show-toplevel)"

SX_SERVER="${SX_SERVER:-hosts/ocaml/_build/default/bin/sx_server.exe}"
if [ ! -x "$SX_SERVER" ]; then
  SX_SERVER="/root/rose-ash/hosts/ocaml/_build/default/bin/sx_server.exe"
fi
if [ ! -x "$SX_SERVER" ]; then
  echo "ERROR: sx_server.exe not found." >&2
  exit 1
fi

VERBOSE="${1:-}"
PASS=0; FAIL=0; ERRORS=""
TMPFILE=$(mktemp); trap "rm -f $TMPFILE" EXIT

cat > "$TMPFILE" <<'EPOCHS'
(epoch 1)
(load "lib/erlang/tokenizer.sx")
(load "lib/erlang/parser.sx")
(load "lib/erlang/parser-core.sx")
(load "lib/erlang/parser-expr.sx")
(load "lib/erlang/parser-module.sx")
(load "lib/erlang/transpile.sx")
(load "lib/erlang/runtime.sx")
(load "lib/erlang/vm/dispatcher.sx")

(epoch 2)
(eval "(get (erlang-load-module (file-read \"next/kernel/http_server.erl\")) :name)")

;; capabilities_path is exposed and non-empty
(epoch 10)
(eval "(get (erlang-eval-ast \"byte_size(http_server:capabilities_path()) > 10\") :name)")

;; GET capabilities_path returns 200
(epoch 11)
(eval "(get (erlang-eval-ast \"P = http_server:capabilities_path(), Req = [{method, <<71,69,84>>}, {path, P}], case http_server:route(Req) of [{status, 200} | _] -> ok; _ -> bad end\") :name)")

;; Capabilities body is non-empty and contains the verb names
(epoch 12)
(eval "(get (erlang-eval-ast \"B = http_server:capabilities_body(), byte_size(B) > 30\") :name)")

;; POST to capabilities path returns 404 (only GET dispatched)
(epoch 13)
(eval "(get (erlang-eval-ast \"P = http_server:capabilities_path(), Req = [{method, <<80,79,83,84>>}, {path, P}], case http_server:route(Req) of [{status, 404} | _] -> ok; _ -> bad end\") :name)")

;; Route returns capabilities_body when matching
(epoch 14)
(eval "(get (erlang-eval-ast \"P = http_server:capabilities_path(), Req = [{method, <<71,69,84>>}, {path, P}], R = http_server:route(Req), case R of [_, _, {body, B}] -> B =:= http_server:capabilities_body(); _ -> false end\") :name)")

;; capabilities_path starts with '/' (47)
(epoch 15)
(eval "(get (erlang-eval-ast \"case http_server:capabilities_path() of <<47, _/binary>> -> ok; _ -> bad end\") :name)")

;; Existing GET / route still works (no regression from the new clause)
(epoch 16)
(eval "(get (erlang-eval-ast \"Req = [{method, <<71,69,84>>}, {path, <<47>>}], case http_server:route(Req) of [{status, 200} | _] -> ok; _ -> bad end\") :name)")
EPOCHS

OUTPUT=$(timeout 60 "$SX_SERVER" < "$TMPFILE" 2>/dev/null)

check() {
  local epoch="$1" desc="$2" expected="$3"
  local actual
  actual=$(echo "$OUTPUT" | awk -v e="$epoch" '
    $0 ~ "^\\(ok-len " e " " { getline; print; exit }
    $0 ~ "^\\(ok " e " "     { print; exit }
    $0 ~ "^\\(error " e " "  { print; exit }
  ')
  [ -z "$actual" ] && actual="<no output for epoch $epoch>"
  if echo "$actual" | grep -qF -- "$expected"; then
    PASS=$((PASS+1))
    [ "$VERBOSE" = "-v" ] && echo "  ok $desc"
  else
    FAIL=$((FAIL+1))
    ERRORS+="  FAIL [$desc] (epoch $epoch) expected: $expected | actual: $actual
"
  fi
}

check  2  "module load name"                  "http_server"
check 10  "capabilities_path non-empty"       "true"
check 11  "GET capabilities -> 200"           "ok"
check 12  "capabilities body non-empty"       "true"
check 13  "POST capabilities -> 404"          "ok"
check 14  "route body matches capabilities"   "true"
check 15  "capabilities_path leading /"       "ok"
check 16  "GET / still works"                 "ok"

TOTAL=$((PASS+FAIL))
if [ $FAIL -eq 0 ]; then
  echo "ok $PASS/$TOTAL next/tests/http_capabilities.sh passed"
else
  echo "FAIL $PASS/$TOTAL passed, $FAIL failed:"
  echo "$ERRORS"
fi
[ $FAIL -eq 0 ]