#!/usr/bin/env bash
# next/tests/pipeline_replay.sh — Step 6c acceptance test.
#
# Exercises pipeline:stage_replay/2 (direct) and stage_replay/1
# (factory) against the in-memory log from Step 3a. Composability
# with stage_envelope verified. 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/envelope.erl\")) :name)")
(epoch 3)
(eval "(get (erlang-load-module (file-read \"next/kernel/log.erl\")) :name)")
(epoch 4)
(eval "(get (erlang-load-module (file-read \"next/kernel/pipeline.erl\")) :name)")

;; New activity in an empty log is ok
(epoch 10)
(eval "(get (erlang-eval-ast \"{ok, L} = log:open(alice, base), Act = [{id, a1}, {type, create}], pipeline:stage_replay(Act, L) =:= ok\") :name)")

;; Same activity already in log -> {error, replay}
(epoch 11)
(eval "(get (erlang-eval-ast \"{ok, L0} = log:open(alice, base), Act = [{id, a1}, {type, create}], {ok, L1, _} = log:append(L0, Act), pipeline:stage_replay(Act, L1) =:= {error, replay}\") :name)")

;; Different :id is still ok even if log non-empty
(epoch 12)
(eval "(get (erlang-eval-ast \"{ok, L0} = log:open(alice, base), {ok, L1, _} = log:append(L0, [{id, a1}, {type, create}]), pipeline:stage_replay([{id, a2}, {type, create}], L1) =:= ok\") :name)")

;; No :id field -> {error, no_id}
(epoch 13)
(eval "(get (erlang-eval-ast \"{ok, L} = log:open(alice, base), pipeline:stage_replay([{type, create}], L) =:= {error, no_id}\") :name)")

;; Match against the second log entry (linear scan walks all entries)
(epoch 14)
(eval "(get (erlang-eval-ast \"{ok, L0} = log:open(alice, base), {ok, L1, _} = log:append(L0, [{id, a1}, {type, create}]), {ok, L2, _} = log:append(L1, [{id, a2}, {type, create}]), pipeline:stage_replay([{id, a2}, {type, update}], L2) =:= {error, replay}\") :name)")

;; stage_replay/1 factory returns a fun
(epoch 15)
(eval "(get (erlang-eval-ast \"{ok, L} = log:open(alice, base), is_function(pipeline:stage_replay(L))\") :name)")

;; Factory + run_stages: fresh activity flows through
(epoch 16)
(eval "(get (erlang-eval-ast \"{ok, L} = log:open(alice, base), Act = [{id, a1}, {type, create}], Stages = [pipeline:stage_replay(L)], pipeline:run_stages(Act, Stages) =:= ok\") :name)")

;; Factory + run_stages: replay halts the pipeline
(epoch 17)
(eval "(get (erlang-eval-ast \"{ok, L0} = log:open(alice, base), Act = [{id, a1}, {type, create}], {ok, L1, _} = log:append(L0, Act), Stages = [pipeline:stage_replay(L1)], pipeline:run_stages(Act, Stages) =:= {error, replay}\") :name)")

;; Composed with stage_envelope: envelope error precedes replay check
(epoch 18)
(eval "(get (erlang-eval-ast \"{ok, L0} = log:open(alice, base), Act = [{id, a1}, {type, create}, {actor, a}, {published, 1}, {signature, [{key_id, k}, {algorithm, e}, {value, v}]}], {ok, L1, _} = log:append(L0, Act), Stages = [fun (A) -> pipeline:stage_envelope(A) end, pipeline:stage_replay(L1)], pipeline:run_stages(Act, Stages) =:= {error, replay}\") :name)")
EPOCHS

OUTPUT=$(timeout 180 "$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  "envelope module loaded"           "envelope"
check  3  "log module loaded"                "log"
check  4  "pipeline module loaded"           "pipeline"
check 10  "new activity in empty log -> ok"  "true"
check 11  "same id -> {error, replay}"       "true"
check 12  "different id still ok"            "true"
check 13  "no :id -> {error, no_id}"         "true"
check 14  "match second log entry"           "true"
check 15  "stage_replay/1 returns fun"       "true"
check 16  "factory + run_stages: ok"         "true"
check 17  "factory + run_stages: halts"      "true"
check 18  "composed envelope+replay halts"   "true"

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