#!/usr/bin/env python3
# Row 117 (#1611): the brief's five mutants of the fetched outcome, one per check.
# m1 fetches for a third reason: a failed status becomes a fetched reason.
# m2 merges after the fetch in a fetched clone.
# m3 drops the fetch for a fetched clone.
# m4 reports the clone's HEAD as the origin commit.
# m5 fetches before the gitlink check (and so before the root checks too).
# Each runs the FULL seat suite (node --test tests/*.test.mjs in packages/seat)
# and restores the source from the .orig copy whatever happens.
# Usage: mutants.py <worktree> <log dir>
import os, shutil, subprocess, sys, signal

WT, LOGS = sys.argv[1], sys.argv[2]
SRC = 'packages/seat/src/checkout.mjs'
FETCH = '[...inClone(dest), "fetch", "-q", "--no-tags", "--no-recurse-submodules", "origin"]'
MERGE = '[...inClone(dest), "merge", "-q", "--ff-only", "--no-edit", `refs/remotes/origin/${at.branch}`]'
MUTANTS = {
    'm1': (SRC,
           '    if (!status.ok) return { outcome: "kept", reason: "status-failed" };\n',
           '    if (!status.ok) reason = "status-failed";\n'),
    'm2': (SRC,
           '  if (reason) {\n',
           f'  if (reason) {{\n    await g({MERGE});\n'),
    'm3': (SRC,
           f'  if (!(await g({FETCH})).ok)',
           f'  if (!reason && !(await g({FETCH})).ok)'),
    'm4': (SRC,
           'origin: { branch: at.branch, commit: origin.ok ? origin.out.trim() : null } };',
           'origin: { branch: at.branch, commit: before } };'),
    'm5': (SRC,
           '  // ls-files reads only the index: no filter, hook or submodule runs.\n',
           f'  await g({FETCH});\n  // ls-files reads only the index: no filter, hook or submodule runs.\n'),
}
os.makedirs(LOGS, exist_ok=True)
env = dict(os.environ, TMPDIR=os.path.expanduser('~/darkwing-scratch/r117/tmp'))
for name, (rel, cur, new) in MUTANTS.items():
    src = os.path.join(WT, rel)
    text = open(src).read()
    if text.count(cur) != 1:
        sys.exit(f'STOP {name}: the target text in {rel} is not unique or has moved')
    if os.path.exists(src + '.orig'):
        sys.exit(f'STOP {rel}.orig already exists')
    log_path = os.path.join(LOGS, f'mutant-{name}.log')
    shutil.copy2(src, src + '.orig')
    try:
        open(src, 'w').write(text.replace(cur, new))
        with open(log_path, 'w') as out:
            p = subprocess.Popen('node --test tests/*.test.mjs', shell=True, cwd=os.path.join(WT, 'packages/seat'),
                                 stdout=out, stderr=subprocess.STDOUT, env=env, start_new_session=True)
            try:
                rc = p.wait(timeout=600)
            except subprocess.TimeoutExpired:
                os.killpg(p.pid, signal.SIGKILL)
                p.wait()
                rc = 'timeout'
    finally:
        shutil.move(src + '.orig', src)
    restored = open(src).read() == text
    log = open(log_path).read()
    counts = [l for l in log.splitlines() if l.startswith(('ℹ pass', 'ℹ fail', 'ℹ skipped'))]
    failed = [l.strip() for l in log.splitlines() if l.lstrip().startswith('✖') and 'failing tests' not in l]
    print(f'mutant {name} rc={rc} {" ".join(counts)} restored={restored}')
    for f in sorted(set(failed)):
        print('  ' + f)
    print('KILLED' if rc != 0 else 'SURVIVED')
    if not restored:
        sys.exit(f'STOP {rel} was not restored')