#!/usr/bin/env bash
# P8-REVIEW axis 3, REFUTER mutations. Reversible. Point PLATFORM at a COPY, never at the repo.
#   PLATFORM=/path/to/copy/platform ./mutations-refuter.sh R1|R2|R3|R4|restore
set -euo pipefail
PLATFORM="${PLATFORM:?set PLATFORM to a copy of platform/}"
R="$PLATFORM/internal/runs/reconcile.go"
S="$PLATFORM/internal/pgstore/sink.go"
M="$PLATFORM/internal/readmodel/readmodel.go"
B="$PLATFORM/internal/books/parse.go"
back() { for f in "$R" "$S" "$M" "$B"; do [ -f "$f.p8bak" ] || cp "$f" "$f.p8bak"; done; }
case "${1:?R1|R2|R3|R4|restore}" in
R1) # "CLEARED BY EVIDENCE, never by the absence of it": drop the guard, so a pass that asked the
    # engine nothing clears the failure count of a wedged run (the 1,0,1,0 oscillation).
  back
  python3 - "$R" <<'PY'
import sys
p=sys.argv[1]; s=open(p).read()
old="""		if !established {
"""
new="""		if !established && false {
"""
assert s.count(old)==1, s.count(old)
open(p,'w').write(s.replace(old,new))
PY
  ;;
R2) # UnsettledRuns keyed on the RUN being over instead of the ATTEMPT being over — the exact
    # regression its own doc comment names ("the hold stayed reserved for the life of the account").
  back
  python3 - "$S" <<'PY'
import sys
p=sys.argv[1]; s=open(p).read()
old="join run_attempts a on a.run_id = r.id and a.ended_at is not null"
new="join run_attempts a on a.run_id = r.id and r.finished_at is not null"
assert s.count(old)==1, s.count(old)
open(p,'w').write(s.replace(old,new))
PY
  ;;
R3) # readmodel.Drain loses the between-books budget gate — the mechanism PD-293 is marked fixed by.
  back
  python3 - "$M" <<'PY'
import sys
p=sys.argv[1]; s=open(p).read()
old="""		if deadline, ok := ctx.Deadline(); ok && time.Until(deadline) < MaterializeBudget {"""
new="""		if deadline, ok := ctx.Deadline(); ok && time.Until(deadline) < 0 && deadline.IsZero() {"""
assert s.count(old)==1, s.count(old)
open(p,'w').write(s.replace(old,new))
PY
  ;;
R4) # books.Sweep loses the "do not start a book we cannot give a whole parse" gate.
  back
  python3 - "$B" <<'PY'
import sys
p=sys.argv[1]; s=open(p).read()
old="""			if deadline, ok := ctx.Deadline(); ok && time.Until(deadline) < jobs.JobTimeout {"""
new="""			if deadline, ok := ctx.Deadline(); ok && time.Until(deadline) < 0 && deadline.IsZero() {"""
assert s.count(old)==1, s.count(old)
open(p,'w').write(s.replace(old,new))
PY
  ;;
restore)
  for f in "$R" "$S" "$M" "$B"; do [ -f "$f.p8bak" ] && mv "$f.p8bak" "$f"; done; echo restored ;;
esac