"""Tests for _write_claude_wrap_base_url / _restore_claude_wrap_base_url (issue #951)."""

from __future__ import annotations

import json
from pathlib import Path

import click
import pytest

from headroom.cli import wrap as wrap_cli


def _settings(tmp_path: Path) -> Path:
    return tmp_path / ".claude" / "settings.json"


def test_write_creates_env_key_in_fresh_file(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    prev = wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path)
    assert prev is None
    payload = json.loads(path.read_text(encoding="utf-8"))
    assert payload["env"]["ANTHROPIC_BASE_URL"] == "http://127.0.0.1:8787"


def test_write_preserves_other_env_keys(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text(json.dumps({"env": {"KEEP": "1", "ANOTHER": "2"}}), encoding="utf-8")
    wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path)
    payload = json.loads(path.read_text(encoding="utf-8"))
    assert payload["env"]["KEEP"] == "1"
    assert payload["env"]["ANOTHER"] == "2"
    assert payload["env"]["ANTHROPIC_BASE_URL"] == "http://127.0.0.1:8787"


def test_tool_search_write_and_restore_reaches_daemon_worker_settings(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text(
        json.dumps({"env": {"ENABLE_TOOL_SEARCH": "true", "KEEP": "1"}}),
        encoding="utf-8",
    )

    previous = wrap_cli._write_claude_wrap_tool_search("false", settings_path=path)

    assert previous == "true"
    assert json.loads(path.read_text(encoding="utf-8"))["env"] == {
        "ENABLE_TOOL_SEARCH": "false",
        "KEEP": "1",
    }

    wrap_cli._restore_claude_wrap_tool_search(previous, settings_path=path)
    assert json.loads(path.read_text(encoding="utf-8"))["env"] == {
        "ENABLE_TOOL_SEARCH": "true",
        "KEEP": "1",
    }


def test_write_returns_none_when_key_absent(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    prev = wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path)
    assert prev is None


def test_write_returns_previous_value_when_key_present(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text(
        json.dumps({"env": {"ANTHROPIC_BASE_URL": "http://old.proxy:9000"}}),
        encoding="utf-8",
    )
    prev = wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path)
    assert prev == "http://old.proxy:9000"
    payload = json.loads(path.read_text(encoding="utf-8"))
    assert payload["env"]["ANTHROPIC_BASE_URL"] == "http://127.0.0.1:8787"


def test_write_foundry_mode_sets_foundry_key(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    wrap_cli._write_claude_wrap_base_url(
        "http://127.0.0.1:8787", foundry_mode=True, settings_path=path
    )
    payload = json.loads(path.read_text(encoding="utf-8"))
    assert payload["env"]["ANTHROPIC_FOUNDRY_BASE_URL"] == "http://127.0.0.1:8787"
    assert "ANTHROPIC_BASE_URL" not in payload["env"]


def test_restore_removes_key_when_previous_none(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text(
        json.dumps({"env": {"ANTHROPIC_BASE_URL": "http://127.0.0.1:8787"}}),
        encoding="utf-8",
    )
    wrap_cli._restore_claude_wrap_base_url(None, settings_path=path)
    # file is deleted when payload becomes empty — key is gone
    assert not path.exists()


def test_restore_removes_env_dict_when_empty(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text(
        json.dumps({"env": {"ANTHROPIC_BASE_URL": "http://127.0.0.1:8787"}}),
        encoding="utf-8",
    )
    wrap_cli._restore_claude_wrap_base_url(None, settings_path=path)
    # entire payload was {"env": {...only our key...}} — file deleted rather than left as {}
    assert not path.exists()


def test_restore_preserves_sibling_env_keys(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text(
        json.dumps({"env": {"ANTHROPIC_BASE_URL": "http://127.0.0.1:8787", "KEEP": "1"}}),
        encoding="utf-8",
    )
    wrap_cli._restore_claude_wrap_base_url(None, settings_path=path)
    payload = json.loads(path.read_text(encoding="utf-8"))
    assert "ANTHROPIC_BASE_URL" not in payload["env"]
    assert payload["env"]["KEEP"] == "1"


def test_restore_sets_key_back_to_previous_value(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text(
        json.dumps({"env": {"ANTHROPIC_BASE_URL": "http://127.0.0.1:8787"}}),
        encoding="utf-8",
    )
    wrap_cli._restore_claude_wrap_base_url("http://old.proxy:9000", settings_path=path)
    payload = json.loads(path.read_text(encoding="utf-8"))
    assert payload["env"]["ANTHROPIC_BASE_URL"] == "http://old.proxy:9000"


def test_restore_foundry_mode_removes_foundry_key(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text(
        json.dumps({"env": {"ANTHROPIC_FOUNDRY_BASE_URL": "http://127.0.0.1:8787"}}),
        encoding="utf-8",
    )
    wrap_cli._restore_claude_wrap_base_url(None, foundry_mode=True, settings_path=path)
    # file deleted when payload empties
    assert not path.exists()


def test_restore_noop_when_file_absent(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    wrap_cli._restore_claude_wrap_base_url(None, settings_path=path)  # must not raise


def test_restore_noop_when_key_not_present(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text(json.dumps({"env": {"OTHER": "1"}}), encoding="utf-8")
    wrap_cli._restore_claude_wrap_base_url(None, settings_path=path)  # key absent — no-op
    assert json.loads(path.read_text())["env"]["OTHER"] == "1"


def test_restore_noop_when_env_not_dict(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text(json.dumps({"env": "not-a-dict"}), encoding="utf-8")
    wrap_cli._restore_claude_wrap_base_url(None, settings_path=path)  # must not raise


def test_restore_noop_when_payload_not_dict(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text("[1, 2, 3]", encoding="utf-8")  # valid JSON but not a dict
    wrap_cli._restore_claude_wrap_base_url(None, settings_path=path)  # must not raise


def test_restore_noop_when_file_corrupt(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text("not valid json {{{{", encoding="utf-8")
    wrap_cli._restore_claude_wrap_base_url(None, settings_path=path)  # must not raise


def test_write_refuses_to_clobber_a_corrupt_file(tmp_path: Path) -> None:
    """A file that will not parse is DATA, not a blank slate — never overwrite it.

    This previously "recovered" by resetting the payload to ``{}`` and writing
    that back, so a single hand-edited typo (or a transient read error) silently
    destroyed the user's whole settings file — permissions, env and hooks — on
    every ``headroom wrap claude``. Refusing leaves the file for the user to fix.
    """
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    original = '{"permissions": {"allow": ["Bash"]}, oops'
    path.write_text(original, encoding="utf-8")

    with pytest.raises(click.ClickException, match="not valid JSON"):
        wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path)

    assert path.read_text(encoding="utf-8") == original  # untouched


def test_write_refuses_non_dict_payload(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    original = "[1, 2, 3]"  # valid JSON but not a settings object
    path.write_text(original, encoding="utf-8")

    with pytest.raises(click.ClickException, match="does not contain a JSON object"):
        wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path)

    assert path.read_text(encoding="utf-8") == original  # untouched


def test_write_recovers_from_an_empty_file(tmp_path: Path) -> None:
    """An empty file has no settings to lose, so recover rather than strand the user.

    A zero-byte settings.json is the classic residue of an interrupted
    non-atomic write, so this is the one case where treating the file as fresh
    is both safe and the helpful thing to do.
    """
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text("   \n", encoding="utf-8")

    prev = wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path)

    assert prev is None
    payload = json.loads(path.read_text(encoding="utf-8"))
    assert payload["env"]["ANTHROPIC_BASE_URL"] == "http://127.0.0.1:8787"


def test_write_restore_roundtrip(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text(json.dumps({"model": "opus", "env": {"OTHER": "x"}}), encoding="utf-8")
    prev = wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path)
    assert prev is None
    payload = json.loads(path.read_text(encoding="utf-8"))
    assert payload["env"]["ANTHROPIC_BASE_URL"] == "http://127.0.0.1:8787"
    assert payload["model"] == "opus"

    wrap_cli._restore_claude_wrap_base_url(prev, settings_path=path)
    payload = json.loads(path.read_text(encoding="utf-8"))
    assert "ANTHROPIC_BASE_URL" not in payload.get("env", {})
    assert payload["env"]["OTHER"] == "x"
    assert payload["model"] == "opus"


# --- stale wrap marker (issue #1768) --------------------------------------


def _marker(tmp_path: Path) -> Path:
    return wrap_cli._wrap_marker_path(_settings(tmp_path))


def test_write_with_port_creates_marker(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path, port=8787)
    marker = json.loads(_marker(tmp_path).read_text(encoding="utf-8"))
    assert marker["port"] == 8787
    assert marker["key"] == "ANTHROPIC_BASE_URL"
    assert marker["previous"] is None
    assert marker["pid"] > 0


def test_write_without_port_skips_marker(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path)
    assert not _marker(tmp_path).exists()


def test_restore_clears_marker_for_matching_key(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path, port=8787)
    assert _marker(tmp_path).exists()
    wrap_cli._restore_claude_wrap_base_url(None, settings_path=path)
    assert not _marker(tmp_path).exists()


def test_wrap_marker_is_stale_when_pid_missing() -> None:
    assert wrap_cli._wrap_marker_is_stale({}) is True


def test_wrap_marker_is_stale_when_pid_dead(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path, port=8787)
    marker = json.loads(_marker(tmp_path).read_text(encoding="utf-8"))
    marker["pid"] = 999_999_999  # astronomically unlikely to be a live pid
    assert wrap_cli._wrap_marker_is_stale(marker) is True


def test_wrap_marker_is_not_stale_for_live_pid(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path, port=8787)
    marker = json.loads(_marker(tmp_path).read_text(encoding="utf-8"))
    assert wrap_cli._wrap_marker_is_stale(marker) is False


def test_wrap_marker_is_stale_when_pid_reused(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    # Inject a deterministic PID identity: _proc_identity returns None on
    # macOS without psutil, where reuse detection is deliberately best-effort
    # and this scenario would be undetectable.
    monkeypatch.setattr(wrap_cli, "_proc_identity", lambda pid: ("test", 50_000.0))
    path = _settings(tmp_path)
    wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path, port=8787)
    marker = json.loads(_marker(tmp_path).read_text(encoding="utf-8"))
    marker["start_time"] = marker["start_time"] - 10_000  # fabricate a mismatched identity
    assert wrap_cli._wrap_marker_is_stale(marker) is True


def test_check_and_clear_stale_wrap_marker_restores_previous(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    path.parent.mkdir(parents=True)
    path.write_text(
        json.dumps({"env": {"ANTHROPIC_BASE_URL": "http://old.proxy:9000"}}), encoding="utf-8"
    )
    wrap_cli._write_wrap_marker(
        path, port=8787, key="ANTHROPIC_BASE_URL", previous="http://old.proxy:9000"
    )
    marker = json.loads(_marker(tmp_path).read_text(encoding="utf-8"))
    marker["pid"] = 999_999_999
    _marker(tmp_path).write_text(json.dumps(marker), encoding="utf-8")

    restored = wrap_cli._check_and_clear_stale_wrap_marker(path, key="ANTHROPIC_BASE_URL")
    assert restored == "http://old.proxy:9000"
    payload = json.loads(path.read_text(encoding="utf-8"))
    assert payload["env"]["ANTHROPIC_BASE_URL"] == "http://old.proxy:9000"
    assert not _marker(tmp_path).exists()


def test_check_and_clear_stale_wrap_marker_leaves_live_marker(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    wrap_cli._write_claude_wrap_base_url("http://127.0.0.1:8787", settings_path=path, port=8787)
    restored = wrap_cli._check_and_clear_stale_wrap_marker(path, key="ANTHROPIC_BASE_URL")
    assert restored is None
    assert _marker(tmp_path).exists()


def test_check_and_clear_stale_wrap_marker_noop_when_no_marker(tmp_path: Path) -> None:
    path = _settings(tmp_path)
    assert wrap_cli._check_and_clear_stale_wrap_marker(path, key="ANTHROPIC_BASE_URL") is None