"""Process lifecycle and provider artifact edge coverage for CLI workers."""

from __future__ import annotations

import json
import os
import signal
import subprocess
import sys
from pathlib import Path

from testing.tests.test_hermes_cli_support import _completed_result, lanes


def test_stream_process_enforces_runtime_and_lease_boundaries(
    tmp_path: Path,
):
    timed_out = lanes.stream_process(
        [sys.executable, "-c", "import time; time.sleep(30)"],
        provider="codex",
        cwd=tmp_path,
        env=dict(os.environ),
        log_path=tmp_path / "timeout.log",
        state={},
        state_file=tmp_path / "timeout-state.json",
        heartbeat=lambda _note: True,
        max_runtime=-1,
    )
    assert "maximum runtime" in timed_out.output
    assert timed_out.returncode != 0

    lease_lost = lanes.stream_process(
        [sys.executable, "-c", "import time; time.sleep(30)"],
        provider="claude",
        cwd=tmp_path,
        env=dict(os.environ),
        log_path=tmp_path / "lease.log",
        state={},
        state_file=tmp_path / "lease-state.json",
        heartbeat=lambda _note: False,
        max_runtime=60,
    )
    assert "lease was lost" in lease_lost.output
    assert lease_lost.returncode != 0


def test_stream_process_bounds_retained_line_history(tmp_path: Path):
    result = lanes.stream_process(
        [
            sys.executable,
            "-c",
            "import sys; [sys.stdout.write(f'{n}\\n') for n in range(4010)]",
        ],
        provider="codex",
        cwd=tmp_path,
        env=dict(os.environ),
        log_path=tmp_path / "bounded.log",
        state={},
        state_file=tmp_path / "state.json",
        heartbeat=lambda _note: True,
        max_runtime=60,
    )
    assert result.returncode == 0
    assert "4009" in result.output


def test_process_identity_and_signal_failures_are_bounded(monkeypatch):
    assert lanes._process_record(999999999) is None
    monkeypatch.setattr(
        lanes,
        "_process_identity_matches",
        lambda _pid, _start: True,
    )
    monkeypatch.setattr(
        lanes.os,
        "killpg",
        lambda *_args: (_ for _ in ()).throw(ProcessLookupError()),
    )
    monkeypatch.setattr(
        lanes.os,
        "kill",
        lambda *_args: (_ for _ in ()).throw(ProcessLookupError()),
    )
    lanes._signal_worker_tree(10, {11: (12, 13)}, signal.SIGTERM)

    signals = []
    monkeypatch.setattr(lanes, "_process_identity_matches", lambda *_args: False)
    monkeypatch.setattr(lanes.os, "killpg", lambda pid, sig: signals.append((pid, sig)))
    monkeypatch.setattr(
        lanes.os,
        "kill",
        lambda *_args: (_ for _ in ()).throw(AssertionError("stale PID signaled")),
    )
    lanes._signal_worker_tree(20, {21: (22, 23)}, signal.SIGKILL)
    assert signals == [(20, signal.SIGKILL)]


def test_descendant_snapshot_follows_multiple_generations(monkeypatch):
    entries = [
        Path("/proc/self"),
        Path("/proc/10"),
        Path("/proc/11"),
        Path("/proc/12"),
        Path("/proc/13"),
    ]
    monkeypatch.setattr(lanes.Path, "iterdir", lambda _path: iter(entries))
    records = {
        10: (1, 10, 100),
        11: (10, 11, 101),
        12: (11, 12, 102),
    }
    monkeypatch.setattr(lanes, "_process_record", lambda pid: records.get(pid))
    assert lanes._descendant_processes(10) == {11: (11, 101), 12: (12, 102)}


def test_claude_missing_unstarted_session_does_not_mark_started(
    tmp_path: Path,
    monkeypatch,
):
    state = {"claude_session_id": "synthetic-session"}
    state_file = tmp_path / "state.json"
    monkeypatch.setattr(
        lanes,
        "stream_process",
        lambda *_args, **_kwargs: lanes.ProcessResult(
            1, lanes.NO_CLAUDE_SESSION, None, False
        ),
    )
    route = lanes.Route("claude", "model", "high", "profile", "test", "test", 1, ())
    result = lanes.run_provider(
        route,
        "work",
        tmp_path,
        state,
        state_file,
        tmp_path / "log",
        lambda _note: True,
        60,
    )
    assert result.returncode == 1
    assert "claude_started" not in state


def test_terminate_escalates_after_term_timeout(monkeypatch):
    class Process:
        pid = 321
        waits = 0

        @classmethod
        def poll(cls):
            return None

        @classmethod
        def wait(cls, timeout):
            cls.waits += 1
            if cls.waits == 1:
                raise subprocess.TimeoutExpired("worker", timeout)
            return 0

    signals = []
    monkeypatch.setattr(lanes, "_descendant_processes", lambda _pid: {})
    monkeypatch.setattr(
        lanes,
        "_signal_worker_tree",
        lambda _pid, _descendants, sig: signals.append(sig),
    )
    lanes._terminate_worker_process(Process())
    assert signals == [signal.SIGTERM, signal.SIGKILL]
    assert Process.waits == 2


def test_codex_result_collision_and_chmod_failure_preserve_result(
    tmp_path: Path,
    monkeypatch,
):
    state = {"run_id": 7, "result_sequence": 0}
    state_file = tmp_path / "task.json"
    first = lanes._result_path(state_file, 7, 1)
    first.write_text("prior", encoding="utf-8")
    result_paths = []

    def stream(command, **_kwargs):
        result_path = Path(command[command.index("-o") + 1])
        result_path.write_text(json.dumps(_completed_result("new result")), encoding="utf-8")
        result_paths.append(result_path)
        return lanes.ProcessResult(0, "", None, False)

    monkeypatch.setattr(lanes, "stream_process", stream)
    monkeypatch.setattr(
        lanes.Path,
        "chmod",
        lambda *_args, **_kwargs: (_ for _ in ()).throw(OSError("readonly")),
    )
    route = lanes.Route("codex", "gpt", "high", "p", "c", "r", 1, ())
    result = lanes.run_provider(
        route,
        "work",
        tmp_path,
        state,
        state_file,
        tmp_path / "log",
        lambda _note: True,
        60,
    )
    assert result.structured["summary"] == "new result"
    assert result_paths[0].name.endswith("provider-2.result.json")


def test_codex_missing_thread_skips_colliding_restart_result(
    tmp_path: Path,
    monkeypatch,
):
    state = {"run_id": 8, "codex_thread_id": "missing"}
    state_file = tmp_path / "task.json"
    second = lanes._result_path(state_file, 8, 2)
    second.write_text("collision", encoding="utf-8")
    calls = []

    def stream(command, **_kwargs):
        calls.append(command)
        if len(calls) == 1:
            return lanes.ProcessResult(1, lanes.NO_CODEX_THREAD, None, False)
        return lanes.ProcessResult(0, "", None, False)

    monkeypatch.setattr(lanes, "stream_process", stream)
    route = lanes.Route("codex", "gpt", "high", "p", "c", "r", 1, ())
    lanes.run_provider(
        route,
        "work",
        tmp_path,
        state,
        state_file,
        tmp_path / "log",
        lambda _note: True,
        60,
    )
    restart = Path(calls[1][calls[1].index("-o") + 1])
    assert restart.name.endswith("provider-3.result.json")


def test_stream_process_trims_the_retained_line_window(tmp_path: Path, monkeypatch):
    """Streamed chatter keeps only the newest bounded output window."""
    monkeypatch.setattr(lanes, "_descendant_processes", lambda _pid: {})
    monkeypatch.setattr(lanes, "_terminate_worker_process", lambda *_a, **_k: None)
    read_fd, write_fd = os.pipe()
    os.write(write_fd, "".join(f"{index}\n" for index in range(4100)).encode())
    os.close(write_fd)
    polls = []

    class ChatteringProcess:
        pid = 4243
        returncode = 0
        stdout = os.fdopen(read_fd, "r")

        def poll(self):
            polls.append(True)
            return None if len(polls) < 4300 else 0

    monkeypatch.setattr(
        lanes.subprocess,
        "Popen",
        lambda *_args, **_kwargs: ChatteringProcess(),
    )
    heartbeats = []

    result = lanes.stream_process(
        ["ignored"],
        provider="codex",
        cwd=tmp_path,
        env=dict(os.environ),
        log_path=tmp_path / "chatter.log",
        state={},
        state_file=tmp_path / "chatter-state.json",
        heartbeat=lambda note: heartbeats.append(note) or True,
        max_runtime=60,
    )

    assert result.returncode == 0
    assert heartbeats
    published = result.output.splitlines()
    assert len(published) == 4000
    assert published[0] == "100"
    assert published[-1] == "4099"


def test_stream_process_parses_output_left_after_worker_exit(
    tmp_path: Path,
    monkeypatch,
):
    """Buffered final output from an already-exited worker is still parsed."""
    payload = json.dumps({"result": json.dumps(_completed_result("buffered"))})
    read_fd, write_fd = os.pipe()
    os.write(write_fd, f"{payload}\n".encode())
    os.close(write_fd)
    fake = type(
        "ExitedProcess",
        (),
        {
            "pid": 4242,
            "returncode": 0,
            "poll": lambda self: 0,
            "stdout": os.fdopen(read_fd, "r"),
        },
    )()
    monkeypatch.setattr(lanes.subprocess, "Popen", lambda *_args, **_kwargs: fake)
    monkeypatch.setattr(lanes, "_terminate_worker_process", lambda *_a, **_k: None)

    result = lanes.stream_process(
        ["ignored"],
        provider="codex",
        cwd=tmp_path,
        env={},
        log_path=tmp_path / "buffered.log",
        state={},
        state_file=tmp_path / "buffered-state.json",
        heartbeat=lambda _note: True,
        max_runtime=60,
    )

    assert result.returncode == 0
    assert result.structured and result.structured["summary"] == "buffered"
    assert payload in (tmp_path / "buffered.log").read_text(encoding="utf-8")


def test_descendant_snapshot_ignores_processes_that_vanish(monkeypatch):
    entries = [Path("/proc/10"), Path("/proc/11"), Path("/proc/13")]
    monkeypatch.setattr(lanes.Path, "iterdir", lambda _path: iter(entries))
    records = {10: (1, 10, 100), 11: (10, 11, 101)}
    monkeypatch.setattr(lanes, "_process_record", lambda pid: records.get(pid))

    assert lanes._descendant_processes(10) == {11: (11, 101)}


def test_signal_tree_targets_only_identity_verified_descendants(monkeypatch):
    """Reused PIDs are never signaled; verified groups and PIDs both are."""
    records = {10: (1, 20, 100)}
    monkeypatch.setattr(lanes, "_process_record", lambda pid: records.get(pid))
    group_signals = []
    pid_signals = []
    monkeypatch.setattr(
        lanes.os,
        "killpg",
        lambda group, sig: group_signals.append((group, sig)),
    )
    monkeypatch.setattr(
        lanes.os,
        "kill",
        lambda pid, sig: pid_signals.append((pid, sig)),
    )

    lanes._signal_worker_tree(
        5,
        {10: (20, 100), 11: (21, 999)},
        signal.SIGTERM,
    )

    assert sorted(group_signals) == [(5, signal.SIGTERM), (20, signal.SIGTERM)]
    assert pid_signals == [(10, signal.SIGTERM)]


def test_claude_worker_without_any_recoverable_session_stays_unstarted(
    tmp_path: Path,
    monkeypatch,
):
    """A session lost on resume and restart never marks the lane as started."""
    state = {"claude_started": True, "claude_session_id": "session-lost"}
    state_file = tmp_path / "state.json"
    commands = []

    def stream(command, **_kwargs):
        commands.append(command)
        return lanes.ProcessResult(
            1,
            f"{lanes.NO_CLAUDE_SESSION} session-lost",
            None,
            False,
        )

    monkeypatch.setattr(lanes, "stream_process", stream)
    persisted = []
    monkeypatch.setattr(
        sys.modules["cli_lane_provider"],
        "atomic_json",
        lambda path, value: persisted.append(dict(value)),
    )
    route = lanes.Route("claude", "claude-fable-5", "high", "p", "c", "r", 1, ())

    result = lanes.run_provider(
        route,
        "prompt",
        tmp_path,
        state,
        state_file,
        tmp_path / "worker.log",
        lambda _note: True,
        60,
    )

    assert result.returncode == 1
    assert len(commands) == 2
    assert "--resume" in commands[0]
    assert "--session-id" in commands[1]
    assert len(persisted) == 1