"""Configuration: env-only, no defaults that point at somebody else's machine."""
from __future__ import annotations

import importlib
import os
from dataclasses import FrozenInstanceError
from typing import Any

import pytest

from dashboards import config
from dashboards.config import Settings, parse_targets


def test_parses_whitespace_and_comma_separated_targets() -> None:
    targets, problems = parse_targets("a=http://h1:9120 b=http://h2:9120,c=http://h3:9120")
    assert [t.name for t in targets] == ["a", "b", "c"]
    assert [t.url for t in targets] == ["http://h1:9120", "http://h2:9120", "http://h3:9120"]
    assert problems == []


def test_trailing_slash_is_stripped_so_urls_do_not_double_up() -> None:
    targets, _ = parse_targets("a=http://h1:9120/")
    assert targets[0].url == "http://h1:9120"


def test_one_bad_entry_does_not_sink_the_others() -> None:
    targets, problems = parse_targets("good=http://h:1 broken-no-equals another=ftp://h:1")
    assert [t.name for t in targets] == ["good"]
    assert len(problems) == 2
    assert any("not name=url" in p for p in problems)
    assert any("http://" in p for p in problems)


def test_empty_input_yields_no_targets_and_no_noise() -> None:
    assert parse_targets("") == ([], [])
    assert parse_targets("   \n  ") == ([], [])


def test_token_in_url_becomes_a_bearer_header_and_stays_out_of_the_display_url() -> None:
    targets, problems = parse_targets("driveripper=http://SEKRIT@driveripper:9120")
    assert problems == []
    target = targets[0]
    assert target.headers == {"Authorization": "Bearer SEKRIT"}
    assert target.url == "http://driveripper:9120", "the token must not stay in the URL"
    assert target.display_url == "http://driveripper:9120"
    assert "SEKRIT" not in target.display_url


def test_target_names_are_restricted_because_they_are_db_keys() -> None:
    """Names key the history DB and appear in URLs, so they are validated, not guessed.

    Whitespace separates entries, which means "Bad Name=http://h" is two entries — both
    reported, because the operator needs to see exactly what was rejected.
    """
    targets, problems = parse_targets("Bad=http://h:1 /=http://h:1 ok-1_2=http://h:1")
    assert [t.name for t in targets] == ["ok-1_2"]
    assert len(problems) == 2
    assert any("Bad" in p for p in problems)

    _targets, problems = parse_targets("Bad Name=http://h:1")
    assert len(problems) == 2, "a space splits the entry, so both halves are rejected"


def test_settings_default_to_no_sources_configured() -> None:
    settings = Settings()
    assert settings.host_targets == ()
    assert settings.gufo_url == "" and settings.vllm_url == ""
    assert settings.nut_host == ""
    assert settings.nut_enabled is False
    assert settings.any_source_enabled is False


def test_actions_need_the_flag_and_are_dead_under_read_only() -> None:
    assert Settings(nut_allow_actions=True, read_only=False).actions_allowed is True
    assert Settings(nut_allow_actions=True, read_only=True).actions_allowed is False
    assert Settings(nut_allow_actions=False, read_only=False).actions_allowed is False


def test_nut_host_accepts_a_nut_scheme_prefix() -> None:
    assert Settings(nut_host="nut://ups-box:3493").nut_enabled is True


def test_load_reads_host_targets_from_the_environment(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setenv("HOST_TARGETS", "deskwork=http://127.0.0.1:9122")
    settings = config.load()
    assert [t.name for t in settings.host_targets] == ["deskwork"]


def test_env_driven_scalars_are_read_at_import(monkeypatch: pytest.MonkeyPatch) -> None:
    """The dataclass defaults read os.environ, so a reload must pick up a changed env."""
    monkeypatch.setenv("DASH_PORT", "8123")
    monkeypatch.setenv("RETAIN_RAW_HOURS", "6")
    monkeypatch.setenv("NUT_ALLOW_ACTIONS", "1")
    reloaded = importlib.reload(config)
    try:
        assert reloaded.SETTINGS.port == 8123
        assert reloaded.SETTINGS.raw_keep_hours == 6
        assert reloaded.SETTINGS.actions_allowed is True
    finally:
        monkeypatch.delenv("DASH_PORT")
        monkeypatch.delenv("RETAIN_RAW_HOURS")
        monkeypatch.delenv("NUT_ALLOW_ACTIONS")
        importlib.reload(config)


def test_flags_accept_the_usual_spellings(monkeypatch: pytest.MonkeyPatch) -> None:
    for truthy in ("1", "true", "TRUE", "yes", "on"):
        monkeypatch.setenv("DASH_READ_ONLY", truthy)
        assert config._flag("DASH_READ_ONLY") is True, truthy
    for falsey in ("0", "false", "", "no"):
        monkeypatch.setenv("DASH_READ_ONLY", falsey)
        assert config._flag("DASH_READ_ONLY") is False, falsey


def test_numeric_env_must_be_a_number_or_the_default_wins(monkeypatch: pytest.MonkeyPatch) -> None:
    monkeypatch.setenv("HOST_INTERVAL_SECONDS", "not-a-number")
    assert config._num("HOST_INTERVAL_SECONDS", 10.0) == 10.0
    monkeypatch.setenv("HOST_INTERVAL_SECONDS", "2.5")
    assert config._num("HOST_INTERVAL_SECONDS", 10.0) == 2.5


def test_settings_is_immutable_so_nobody_mutates_shared_state() -> None:
    settings: Any = Settings()
    with pytest.raises(FrozenInstanceError):
        settings.port = 1  # type: ignore[misc]


# ---- the .env convenience -------------------------------------------------- #

def test_no_env_file_is_the_normal_case(monkeypatch: pytest.MonkeyPatch, tmp_path: Any) -> None:
    monkeypatch.setenv("DASH_ENV_FILE", str(tmp_path / "absent.env"))
    assert config.load_env_file() is None


def test_env_file_seeds_values_a_deployed_env_does_not_set(monkeypatch: pytest.MonkeyPatch,
                                                          tmp_path: Any) -> None:
    env = tmp_path / ".env"
    env.write_text("DASH_PORT=9999\nNUT_HOST=ups.internal\n")
    monkeypatch.setenv("DASH_ENV_FILE", str(env))
    monkeypatch.delenv("DASH_PORT", raising=False)
    monkeypatch.delenv("NUT_HOST", raising=False)
    assert config.load_env_file() == env
    # Settings reads its defaults when the module is imported, so the reload is what a real
    # process gets for free and what the test has to ask for explicitly
    reloaded = importlib.reload(config)
    assert reloaded.SETTINGS.port == 9999
    assert reloaded.SETTINGS.nut_host == "ups.internal"


def test_a_real_environment_variable_beats_the_file(monkeypatch: pytest.MonkeyPatch,
                                                   tmp_path: Any) -> None:
    """The container/quadlet env is the source of truth; the file is for laptops."""
    env = tmp_path / ".env"
    env.write_text("DASH_PORT=9999\n")
    monkeypatch.setenv("DASH_ENV_FILE", str(env))
    monkeypatch.setenv("DASH_PORT", "7777")
    reloaded = importlib.reload(config)
    assert os.environ["DASH_PORT"] == "7777"
    assert reloaded.SETTINGS.port == 7777


def test_env_file_expands_other_variables(monkeypatch: pytest.MonkeyPatch, tmp_path: Any) -> None:
    """`.env.example` shows `DASH_DB=${HOME}/...` — the file has to mean what it shows."""
    env = tmp_path / ".env"
    env.write_text("MY_BASE=/srv/dash\nDASH_DB=${MY_BASE}/dashboards.sqlite3\n")
    monkeypatch.setenv("DASH_ENV_FILE", str(env))
    monkeypatch.delenv("MY_BASE", raising=False)
    monkeypatch.delenv("DASH_DB", raising=False)
    reloaded = importlib.reload(config)
    assert reloaded.SETTINGS.db_path == "/srv/dash/dashboards.sqlite3"


def test_the_example_file_is_never_loaded(monkeypatch: pytest.MonkeyPatch, tmp_path: Any) -> None:
    example = tmp_path / ".env.example"
    example.write_text("NUT_HOST=should-not-load\n")
    monkeypatch.setenv("DASH_ENV_FILE", str(example))
    monkeypatch.delenv("NUT_HOST", raising=False)
    reloaded = importlib.reload(config)
    assert reloaded.load_env_file() is None
    assert reloaded.SETTINGS.nut_host == ""