from pathlib import Path

import pytest

from nisse_dev.config import AgentConfig, ConfigError

COMPLETE = {
    "NISSE_STATE_DB": "~/demo/state.db",
    "NISSE_WORKSPACE": "~/demo/work",
    "NISSE_PROJECT": "greet",
    "NISSE_LLM_BASE_URL": "https://litellm.test",
    "NISSE_LLM_TOKEN": "sk-x",
    "NISSE_ROLE_EXECUTOR": "claude-haiku-4-5",
    "NISSE_ROLE_PLANNER": "claude-opus-5",
    "NISSE_ROLE_DELEGATE": "claude-opus-5",
    "NISSE_ROLE_CONSULTANT": "claude-haiku-4-5",
    "NISSE_MATRIX_HOMESERVER": "https://matrix.test",
    "NISSE_MATRIX_USER_ID": "@nisse-dev-testing:test",
    "NISSE_MATRIX_TOKEN": "syt_x",
    "NISSE_MATRIX_ROOM_ID": "!room:test",
    "NISSE_MATRIX_OPERATORS": "@don:test",
    "NISSE_GITEA_URL": "https://gitea.test",
    "NISSE_GITEA_TOKEN": "gt",
    "NISSE_GITEA_REPO": "don/demo",
    "NISSE_GITEA_OPERATORS": "don",
}


def test_complete_environment_builds() -> None:
    config = AgentConfig.from_env(COMPLETE)
    assert config.project == "greet"
    assert config.roles.planner == "claude-opus-5"
    assert config.matrix.room_id == "!room:test"
    assert config.gitea_repo == "don/demo"
    assert config.base_branch == "main"


def test_paths_expand_the_home_directory() -> None:
    config = AgentConfig.from_env(COMPLETE)
    assert config.workspace.is_absolute()
    assert "~" not in str(config.state_db)


def test_every_missing_variable_is_reported_at_once() -> None:
    # Failing at first use would surface a missing token twenty minutes into
    # a milestone, on the call that mattered.
    partial = {k: v for k, v in COMPLETE.items() if k != "NISSE_MATRIX_TOKEN"}
    partial.pop("NISSE_GITEA_REPO")
    with pytest.raises(ConfigError) as excinfo:
        AgentConfig.from_env(partial)
    message = str(excinfo.value)
    assert "NISSE_MATRIX_TOKEN" in message
    assert "NISSE_GITEA_REPO" in message


def test_empty_is_treated_as_missing() -> None:
    with pytest.raises(ConfigError, match="NISSE_GITEA_TOKEN"):
        AgentConfig.from_env({**COMPLETE, "NISSE_GITEA_TOKEN": "   "})


def test_operator_lists_are_split_and_trimmed() -> None:
    config = AgentConfig.from_env(
        {
            **COMPLETE,
            "NISSE_MATRIX_OPERATORS": " @don:test , @other:test ,",
            "NISSE_GITEA_OPERATORS": "don,",
        }
    )
    assert config.operators == {"@don:test", "@other:test"}
    # A trailing comma must not admit an empty identity into an allowlist.
    assert "" not in config.operators
    assert config.gitea_operators == {"don"}


def test_base_branch_is_overridable() -> None:
    config = AgentConfig.from_env({**COMPLETE, "NISSE_BASE_BRANCH": "trunk"})
    assert config.base_branch == "trunk"


def test_redacted_summary_carries_no_secrets() -> None:
    summary = AgentConfig.from_env(COMPLETE).redacted()
    flat = " ".join(summary.values())
    for secret in ("sk-x", "syt_x", "gt"):
        assert secret not in flat
    assert summary["project"] == "greet"


def test_state_db_and_workspace_are_separate(tmp_path: Path) -> None:
    # A2: build artefacts must not share a volume with agent state.
    config = AgentConfig.from_env(COMPLETE)
    assert config.state_db.parent != config.workspace


def test_state_db_inside_the_clone_is_refused(tmp_path: Path) -> None:
    # git add -A would commit it, and the push would publish the agent's
    # own state alongside the project.
    work = tmp_path / "project"
    with pytest.raises(ConfigError, match="inside the workspace"):
        AgentConfig.from_env(
            {
                **COMPLETE,
                "NISSE_WORKSPACE": str(work),
                "NISSE_STATE_DB": str(work / "state.db"),
            }
        )


def test_env_file_inside_the_clone_is_refused(tmp_path: Path) -> None:
    # The severe case: the agent would commit and push its own credentials
    # as a side effect of working correctly.
    work = tmp_path / "project"
    with pytest.raises(ConfigError, match="NISSE_ENV"):
        AgentConfig.from_env(
            {
                **COMPLETE,
                "NISSE_WORKSPACE": str(work),
                "NISSE_STATE_DB": str(tmp_path / "state.db"),
                "NISSE_ENV": str(work / ".env"),
            }
        )


def test_sibling_paths_are_fine(tmp_path: Path) -> None:
    config = AgentConfig.from_env(
        {
            **COMPLETE,
            "NISSE_WORKSPACE": str(tmp_path / "project"),
            "NISSE_STATE_DB": str(tmp_path / "state.db"),
            "NISSE_ENV": str(tmp_path / ".env"),
        }
    )
    assert config.workspace.name == "project"


# --- the YAML file (#32) ---------------------------------------------------

FILE = """
state_db: ~/demo/state.db
workspace: ~/demo/work
project: greet
llm:
  base_url: https://litellm.test
  token: ${TEST_LLM_TOKEN}
roles:
  executor: local-fast
  planner: claude-opus-5
  delegate: claude-opus-5
  consultant: claude-haiku-4-5
matrix:
  homeserver: https://matrix.test/
  user_id: "@nisse-dev-testing:test"
  token: ${TEST_MATRIX_TOKEN}
  room_id: "!room:test"
  operators: ["@don:test", " "]
gitea:
  url: https://gitea.test
  token: ${TEST_GITEA_TOKEN}
  repo: don/demo
  operators: [don]
"""
SECRETS = {
    "TEST_LLM_TOKEN": "sk-x",
    "TEST_MATRIX_TOKEN": "syt_x",
    "TEST_GITEA_TOKEN": "gt",
}


def write(tmp_path: Path, text: str) -> Path:
    path = tmp_path / "nisse-dev.yaml"
    path.write_text(text)
    return path


def test_a_file_configures_everything_with_secrets_by_reference(
    tmp_path: Path,
) -> None:
    config = AgentConfig.from_sources(SECRETS, write(tmp_path, FILE))
    assert config.llm_token == "sk-x"
    assert config.gitea_token == "gt"
    assert config.roles.executor == "local-fast"
    assert config.operators == {"@don:test"}  # a blank entry admits no one
    assert config.matrix.homeserver == "https://matrix.test"
    assert config.tuning.executor.max_turns == 24  # absent section: defaults


def test_the_environment_wins_over_the_file(tmp_path: Path) -> None:
    config = AgentConfig.from_sources(
        {**SECRETS, "NISSE_ROLE_EXECUTOR": "claude-haiku-4-5"}, write(tmp_path, FILE)
    )
    assert config.roles.executor == "claude-haiku-4-5"


def test_an_overridden_key_needs_no_resolvable_reference(tmp_path: Path) -> None:
    env = {k: v for k, v in SECRETS.items() if k != "TEST_LLM_TOKEN"}
    config = AgentConfig.from_sources(
        {**env, "NISSE_LLM_TOKEN": "sk-env"}, write(tmp_path, FILE)
    )
    assert config.llm_token == "sk-env"


def test_a_reference_to_an_unset_variable_is_an_error(tmp_path: Path) -> None:
    env = {k: v for k, v in SECRETS.items() if k != "TEST_GITEA_TOKEN"}
    with pytest.raises(ConfigError, match=r"gitea.token: references \$\{TEST_GITEA"):
        AgentConfig.from_sources(env, write(tmp_path, FILE))


def test_tuning_is_read_from_the_file(tmp_path: Path) -> None:
    text = (
        FILE
        + """
tuning:
  executor: {max_turns: 40, failure_limit: 3}
  expert: {consult_budget: 5}
  delegation: {max_turns: 20, max_tokens: 100000, wall_clock_s: 600}
  tools: {command_timeout_s: 300, max_output_chars: 2000}
"""
    )
    tuning = AgentConfig.from_sources(SECRETS, write(tmp_path, text)).tuning
    assert (tuning.executor.max_turns, tuning.executor.failure_limit) == (40, 3)
    assert tuning.expert.consult_budget == 5
    assert tuning.delegation.max_tokens == 100_000
    assert tuning.delegation.wall_clock_s == 600.0
    assert tuning.tools.max_output_chars == 2000
    # A section that is only partly given keeps defaults for the rest.
    partial = FILE + "\ntuning:\n  executor: {max_turns: 40}\n"
    tuning = AgentConfig.from_sources(SECRETS, write(tmp_path, partial)).tuning
    assert tuning.executor.failure_limit == 2


def test_every_problem_in_a_file_is_reported_at_once(tmp_path: Path) -> None:
    # A misspelt knob that was silently ignored would look exactly like a knob
    # with no effect, so unknown keys are errors.
    text = (
        FILE.replace("project: greet\n", "")
        + """
llm_extra: 1
tuning:
  executor: {max_turn: 40, failure_limit: 0}
  expert: {consult_budget: true}
  bogus: {x: 1}
"""
    )
    with pytest.raises(ConfigError) as excinfo:
        AgentConfig.from_sources(SECRETS, write(tmp_path, text))
    message = str(excinfo.value)
    for expected in (
        "project (NISSE_PROJECT)",
        "llm_extra: unknown setting",
        "tuning.executor.max_turn: unknown setting",
        "tuning.executor.failure_limit: must be a positive number",
        "tuning.expert.consult_budget: must be a positive number",
        "tuning.bogus: unknown section",
    ):
        assert expected in message


def test_a_whole_number_is_required_where_one_is_meant(tmp_path: Path) -> None:
    text = FILE + "\ntuning:\n  executor: {max_turns: 2.5}\n"
    with pytest.raises(ConfigError, match="tuning.executor.max_turns"):
        AgentConfig.from_sources(SECRETS, write(tmp_path, text))


def test_max_output_tokens_comes_from_the_file_or_the_environment(
    tmp_path: Path,
) -> None:
    text = FILE.replace(
        "  base_url: https://litellm.test\n",
        "  base_url: https://litellm.test\n  max_output_tokens: 8192\n",
    )
    path = write(tmp_path, text)
    assert AgentConfig.from_sources(SECRETS, path).max_output_tokens == 8192
    env = {**SECRETS, "NISSE_MAX_OUTPUT_TOKENS": "4096"}
    assert AgentConfig.from_sources(env, path).max_output_tokens == 4096


def test_load_finds_the_named_file_and_refuses_a_missing_one(tmp_path: Path) -> None:
    path = write(tmp_path, FILE)
    assert AgentConfig.load({**SECRETS, "NISSE_CONFIG": str(path)}).project == "greet"
    with pytest.raises(ConfigError, match="missing"):
        AgentConfig.load({**SECRETS, "NISSE_CONFIG": str(tmp_path / "absent.yaml")})


def test_load_without_a_file_uses_the_environment(
    tmp_path: Path, monkeypatch: pytest.MonkeyPatch
) -> None:
    monkeypatch.chdir(tmp_path)  # no ./nisse-dev.yaml here
    assert AgentConfig.load(COMPLETE).config_file is None


def test_a_config_file_inside_the_clone_is_refused(tmp_path: Path) -> None:
    work = tmp_path / "project"
    work.mkdir()
    text = FILE.replace("workspace: ~/demo/work", f"workspace: {work}")
    path = work / "nisse-dev.yaml"
    path.write_text(text)
    with pytest.raises(ConfigError, match="NISSE_CONFIG"):
        AgentConfig.from_sources(SECRETS, path)


def test_the_example_file_is_valid(tmp_path: Path) -> None:
    # The example documents every knob; it must not drift out of loading.
    example = Path(__file__).resolve().parents[2] / "nisse-dev.example.yaml"
    env = {
        "NISSE_LLM_TOKEN": "sk-x",
        "NISSE_MATRIX_TOKEN": "syt_x",
        "NISSE_GITEA_TOKEN": "gt",
    }
    config = AgentConfig.from_sources(env, example)
    assert config.tuning.executor.max_turns == 24