#!/usr/bin/env bash
# next/tests/http_route.sh — Step 8b acceptance test.
#
# Exercises http_server:route/1 — pure (Request) -> Response
# proplist dispatch. The actual HTTP listener (which would call
# this via the http:listen/2 BIF bridge) is wired in Step 8c+.
# 10 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)")

;; GET / -> 200
(epoch 10)
(eval "(get (erlang-eval-ast \"Req = [{method, <<71,69,84>>}, {path, <<47>>}], case http_server:route(Req) of [{status, 200} | _] -> ok; _ -> bad end\") :name)")

;; GET / body is the welcome message
(epoch 11)
(eval "(get (erlang-eval-ast \"Req = [{method, <<71,69,84>>}, {path, <<47>>}], R = http_server:route(Req), case R of [_, _, {body, B}] -> B =:= http_server:welcome_body(); _ -> false end\") :name)")

;; POST / -> 404 (only GET / is known)
(epoch 12)
(eval "(get (erlang-eval-ast \"Req = [{method, <<80,79,83,84>>}, {path, <<47>>}], case http_server:route(Req) of [{status, 404} | _] -> ok; _ -> bad end\") :name)")

;; GET /unknown -> 404
(epoch 13)
(eval "(get (erlang-eval-ast \"Req = [{method, <<71,69,84>>}, {path, <<47,102,111,111>>}], case http_server:route(Req) of [{status, 404} | _] -> ok; _ -> bad end\") :name)")

;; Missing fields -> 404 (graceful)
(epoch 14)
(eval "(get (erlang-eval-ast \"case http_server:route([]) of [{status, 404} | _] -> ok; _ -> bad end\") :name)")

;; Response always has :status, :headers, :body
(epoch 15)
(eval "(erlang-eval-ast \"R = http_server:not_found_response(), length(R)\")")

;; ok_response sets the right status
(epoch 16)
(eval "(erlang-eval-ast \"R = http_server:ok_response(<<104,105>>), case R of [{status, 200} | _] -> 200; _ -> nope end\")")

;; ok_response carries the supplied body
(epoch 17)
(eval "(get (erlang-eval-ast \"R = http_server:ok_response(<<104,105>>), case R of [_, _, {body, B}] -> B =:= <<104,105>>; _ -> false end\") :name)")

;; not_found body present (non-empty)
(epoch 18)
(eval "(get (erlang-eval-ast \"R = http_server:not_found_response(), case R of [_, _, {body, B}] -> byte_size(B) > 0; _ -> false end\") :name)")

;; welcome_body is non-empty
(epoch 19)
(eval "(get (erlang-eval-ast \"byte_size(http_server:welcome_body()) > 0\") :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  "GET / -> 200"                      "ok"
check 11  "GET / body is welcome"             "true"
check 12  "POST / -> 404"                     "ok"
check 13  "GET /unknown -> 404"               "ok"
check 14  "missing fields -> 404"             "ok"
check 15  "response has 3 entries"            "3"
check 16  "ok_response status = 200"          "200"
check 17  "ok_response carries body"          "true"
check 18  "not_found body non-empty"          "true"
check 19  "welcome body non-empty"            "true"

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