"""SDK/API preflight (K7, S4.1-analog; paritetsrad 20) — LOAD-BEARING (§11).

Everything that CAN be validated WITHOUT a model call is validated here, BEFORE
the operator pays for one. Every seam is load-bearing: the RED-when-detached
notes on the three required proofs (credential, placeholder model id, no-network
grep-guard) name the mutation that makes them fail, so a green-but-dead check
can't hide.

Offline invariant: the preflight never calls ``query()``, never validates a key
VALUE online, never touches the network. Importing ``claude_agent_sdk`` (to prove
importability + bundled CLI presence) is offline-safe — the whole suite already
imports the SDK client without a key or a socket.
"""

from __future__ import annotations

import ast
import importlib
from pathlib import Path

import pytest

from portfolio_optimiser_claude.contracts import ModelMapContract
from portfolio_optimiser_claude.preflight import (
    Refusal,
    _check_credentials,
    _check_model_map,
    _check_sdk,
    _check_termination,
    _locate_cli,
    _looks_like_placeholder,
    main,
    run_preflight,
)

SRC_PKG = Path(__file__).resolve().parents[1] / "src" / "portfolio_optimiser_claude"

_REAL_KEY = "sk-ant-api03-abc123def456"  # shape only — never validated online


def _kinds(refusals: list[Refusal]) -> set[str]:
    return {r.check for r in refusals}


class TestCredentialContract:
    """RED (detach the no-credential branch → green without a key): a run with
    NO API credential set is refused BEFORE any spend — the key VALUE, however,
    is never checked online, only that one is present and not a placeholder."""

    def test_no_credential_is_refused(self) -> None:
        refusals = _check_credentials({})
        assert any(r.check == "credential" for r in refusals)

    def test_a_set_key_clears_the_credential_check(self) -> None:
        assert _check_credentials({"ANTHROPIC_API_KEY": _REAL_KEY}) == []

    def test_a_placeholder_key_is_refused(self) -> None:
        refusals = _check_credentials({"ANTHROPIC_API_KEY": "your-key-here"})
        assert any(r.check == "credential" for r in refusals)
        assert any("placeholder" in r.detail.lower() for r in refusals)

    def test_the_key_value_is_never_asserted_only_its_presence(self) -> None:
        # Any non-placeholder string satisfies the contract — the preflight is
        # the boundary; a bad key surfaces on the FIRST call, never here (§1).
        assert _check_credentials({"ANTHROPIC_API_KEY": "obviously-not-a-real-key-42"}) == []

    def test_the_bundled_cli_oauth_token_satisfies_the_credential(self) -> None:
        # run_s10 relies on the bundled CLI's own credentials when no key is
        # exported; refusing that would be a false alarm (§1 honesty).
        assert _check_credentials({"CLAUDE_CODE_OAUTH_TOKEN": "sk-ant-oat01-real"}) == []


class TestPlaceholderModelIdRefused:
    """RED (detach the resolve_model placeholder guard → a placeholder id passes):
    a model_map whose resolved id is a placeholder form is refused — and the check
    goes THROUGH resolve_model, so the ``default`` fall-through is covered too."""

    def test_a_placeholder_default_model_id_is_refused(self) -> None:
        model_map = ModelMapContract(profiles={"anthropic": {"default": "REPLACE_ME"}})
        refusals = _check_model_map("anthropic", model_map=model_map)
        assert any(r.check == "model_map" for r in refusals)

    def test_a_placeholder_role_model_id_is_refused(self) -> None:
        model_map = ModelMapContract(
            profiles={"anthropic": {"default": "claude-haiku-4-5-20251001", "proposer": "<todo>"}}
        )
        refusals = _check_model_map("anthropic", model_map=model_map)
        assert any(r.check == "model_map" for r in refusals)

    def test_a_real_model_map_clears(self) -> None:
        model_map = ModelMapContract(
            profiles={"anthropic": {"default": "claude-haiku-4-5-20251001"}}
        )
        assert _check_model_map("anthropic", model_map=model_map) == []

    def test_an_unknown_profile_is_refused_without_raising(self) -> None:
        # resolve_model would raise on an unknown profile; the preflight turns
        # that into a structured refusal, never a stack trace before spend.
        model_map = ModelMapContract(
            profiles={"anthropic": {"default": "claude-haiku-4-5-20251001"}}
        )
        refusals = _check_model_map("bedrock", model_map=model_map)
        assert any(r.check == "model_map" for r in refusals)
        assert any("bedrock" in r.detail for r in refusals)

    def test_the_bundled_model_map_is_clear(self) -> None:
        # Nøkkelantakelse: the shipped model_map configures only real ids.
        assert _check_model_map("anthropic") == []


class TestPlaceholderDetector:
    """The shared placeholder detector guards BOTH the key and the model id path."""

    @pytest.mark.parametrize(
        "value",
        ["", "  ", "your-key-here", "REPLACE_ME", "changeme", "<model>", "TODO", "xxxx-xxxx"],
    )
    def test_placeholder_forms_are_caught(self, value: str) -> None:
        assert _looks_like_placeholder(value)

    @pytest.mark.parametrize("value", ["claude-haiku-4-5-20251001", _REAL_KEY, "sk-ant-oat01-real"])
    def test_real_values_pass(self, value: str) -> None:
        assert not _looks_like_placeholder(value)


class TestSdkAndBundledCli:
    """Nøkkelantakelse (verified against installed claude-agent-sdk 0.2.120): the
    SDK imports and its bundled CLI is present on disk — checked OFFLINE via the
    package's own files, mirroring the SDK's ``_find_cli`` order. Never a net call."""

    def test_the_installed_sdk_clears(self) -> None:
        assert _check_sdk() == []

    def test_the_bundled_cli_is_locatable_offline(self) -> None:
        sdk = importlib.import_module("claude_agent_sdk")
        cli = _locate_cli(sdk)
        assert cli is not None
        assert cli.exists()

    def test_a_missing_sdk_is_refused_not_crashed(self, monkeypatch: pytest.MonkeyPatch) -> None:
        # Detach-proof for graceful degradation: an uninstallable SDK becomes a
        # structured refusal naming the fix, never an ImportError at preflight.
        import portfolio_optimiser_claude.preflight as pf

        def _boom(name: str) -> object:
            raise ImportError(f"no module named {name}")

        monkeypatch.setattr(pf.importlib, "import_module", _boom)
        refusals = _check_sdk()
        assert any(r.check == "sdk" for r in refusals)
        assert any("claude-agent-sdk" in r.detail for r in refusals)


class TestTerminationContract:
    """§8: the stop/budget contract must be SET and valid before any spend."""

    def test_positive_caps_clear(self) -> None:
        assert _check_termination(12, 150_000, 0.25) == []

    @pytest.mark.parametrize("rounds,tokens", [(0, 150_000), (12, 0), (-1, 10)])
    def test_non_positive_stop_caps_are_refused(self, rounds: int, tokens: int) -> None:
        refusals = _check_termination(rounds, tokens, 0.25)
        assert any(r.check == "termination" for r in refusals)

    @pytest.mark.parametrize("cap", [0.0, -0.5])
    def test_non_positive_usd_cap_is_refused(self, cap: float) -> None:
        refusals = _check_termination(12, 150_000, cap)
        assert any(r.check == "termination" for r in refusals)


class TestRunPreflightAggregates:
    """The whole preflight is the union of its checks — offline, no model call."""

    def test_a_good_config_yields_no_refusals(self) -> None:
        assert run_preflight(profile="anthropic", env={"ANTHROPIC_API_KEY": _REAL_KEY}) == []

    def test_a_bad_config_collects_every_failing_dimension(self) -> None:
        refusals = run_preflight(
            profile="bedrock",  # unknown profile
            env={},  # no credential
            max_rounds=0,  # bad stop contract
            max_tokens=150_000,
        )
        assert {"credential", "model_map", "termination"} <= _kinds(refusals)


class TestCli:
    """The thin CLI: refusals → non-zero exit + actionable lines; clear → 0.

    Honesty (§1): the output states no model call was made — the preflight IS
    the boundary, so a green preflight never implies a validated key or a run.
    """

    def test_clear_run_returns_zero(
        self, monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]
    ) -> None:
        monkeypatch.setenv("ANTHROPIC_API_KEY", _REAL_KEY)
        monkeypatch.delenv("CLAUDE_CODE_OAUTH_TOKEN", raising=False)
        rc = main(["--profile", "anthropic"])
        out = capsys.readouterr().out
        assert rc == 0
        assert "OK" in out
        assert "no model call" in out.lower()

    def test_missing_credential_returns_one_with_actionable_line(
        self, monkeypatch: pytest.MonkeyPatch, capsys: pytest.CaptureFixture[str]
    ) -> None:
        monkeypatch.delenv("ANTHROPIC_API_KEY", raising=False)
        monkeypatch.delenv("CLAUDE_CODE_OAUTH_TOKEN", raising=False)
        rc = main(["--profile", "anthropic"])
        out = capsys.readouterr().out
        assert rc == 1
        assert "ANTHROPIC_API_KEY" in out
        assert "no spend" in out.lower() or "no model call" in out.lower()


def _imported_module_names(module_path: Path) -> set[str]:
    tree = ast.parse(module_path.read_text(encoding="utf-8"))
    names: set[str] = set()
    for node in ast.walk(tree):
        if isinstance(node, ast.Import):
            names.update(alias.name.split(".")[0] for alias in node.names)
        elif isinstance(node, ast.ImportFrom) and node.level == 0 and node.module:
            names.add(node.module.split(".")[0])
    return names


def _called_names(module_path: Path) -> set[str]:
    """Every function/method NAME called in the module (AST, ignores prose)."""
    tree = ast.parse(module_path.read_text(encoding="utf-8"))
    called: set[str] = set()
    for node in ast.walk(tree):
        if isinstance(node, ast.Call):
            func = node.func
            if isinstance(func, ast.Name):
                called.add(func.id)
            elif isinstance(func, ast.Attribute):
                called.add(func.attr)
    return called


class TestPreflightIsOffline:
    """RED (add ``import socket`` / ``import httpx`` to preflight.py): the
    grep-guard proves the preflight carries NO network path — it validates the
    SDK by IMPORTING it, never by reaching the API."""

    def test_no_network_module_is_imported(self) -> None:
        # The offline seam (grep-guard, AST form): no socket/httpx path exists —
        # importing any of these is the detach that turns this RED.
        names = _imported_module_names(SRC_PKG / "preflight.py")
        assert not names & {"socket", "urllib", "http", "requests", "httpx", "anthropic"}

    def test_no_sdk_completion_is_called(self) -> None:
        # The preflight IS the boundary: it may IMPORT the SDK but must never
        # invoke query()/ClaudeSDKClient — that call would be the spend it guards.
        # AST-based, so a docstring mentioning query() stays green; only a real
        # call trips it (add ``query(prompt=...)`` → RED).
        called = _called_names(SRC_PKG / "preflight.py")
        # Positive control: the AST walk really does find calls (a parse that yielded an
        # empty set would satisfy both negatives vacuously), and specifically the import
        # the comment above permits — so this measures IMPORT-yes/INVOKE-no, not silence.
        assert "import_module" in called
        assert "query" not in called
        assert "ClaudeSDKClient" not in called