"""
TEI client tests with mocked HTTP.

We mock ``requests.Session.request`` so tests do not require network access
or a live Athena instance.
"""

from __future__ import annotations

import json
from unittest.mock import MagicMock

import pytest

from core.tei_client import AthenaAPIError, TEIClient


def _mock_response(status: int, body=None) -> MagicMock:
    resp = MagicMock()
    resp.status_code = status
    resp.content = b"{}" if body is None else json.dumps(body).encode()
    resp.json.return_value = body if body is not None else {}
    resp.text = json.dumps(body or {})
    return resp


@pytest.fixture
def client(monkeypatch) -> TEIClient:
    c = TEIClient()
    c.session = MagicMock()
    return c


class TestConfig:
    def test_requires_base_url(self, monkeypatch):
        monkeypatch.delenv("ATHENA_BASE_URL", raising=False)
        with pytest.raises(ValueError, match="ATHENA_BASE_URL"):
            TEIClient(api_key="x")

    def test_requires_api_key(self, monkeypatch):
        monkeypatch.delenv("ATHENA_API_KEY", raising=False)
        with pytest.raises(ValueError, match="ATHENA_API_KEY"):
            TEIClient(base_url="https://example.com")

    def test_authorization_header(self):
        c = TEIClient(base_url="https://example.com", api_key="abc123")
        assert c.session.headers["Authorization"] == "Api-Key abc123"


class TestPaths:
    """Verify each endpoint targets the documented URL."""

    def _last_call_url(self, client: TEIClient) -> str:
        return client.session.request.call_args.kwargs["url"]

    def test_list_reports_path(self, client):
        client.session.request.return_value = _mock_response(
            200, {"results": [], "next": None}
        )
        client.list_reports()
        assert self._last_call_url(client) == "https://athena.test/api/v1/tei/reports/"

    def test_get_tool_path(self, client):
        client.session.request.return_value = _mock_response(200, {"id": "abc"})
        client.get_tool("abc123")
        assert self._last_call_url(client).endswith("/api/v1/tei/tools/abc123/")

    def test_calculate_path(self, client):
        client.session.request.return_value = _mock_response(200, {})
        client.calculate("abc")
        assert self._last_call_url(client).endswith("/api/v1/tei/tools/abc/calculate/")
        assert client.session.request.call_args.kwargs["method"] == "POST"

    def test_export_path(self, client):
        client.session.request.return_value = _mock_response(200, {})
        client.export("abc")
        assert self._last_call_url(client).endswith("/api/v1/tei/tools/abc/export/")

    def test_aggregate_summary_path(self, client):
        client.session.request.return_value = _mock_response(200, {})
        client.aggregate_summary()
        assert self._last_call_url(client).endswith("/api/v1/tei/summary/")

    def test_save_version_path(self, client):
        client.session.request.return_value = _mock_response(201, {"version_number": 1})
        client.save_version("abc", note="initial")
        url = self._last_call_url(client)
        assert url.endswith("/api/v1/tei/tools/abc/versions/")
        body = client.session.request.call_args.kwargs["json"]
        assert body == {"note": "initial"}


class TestErrorHandling:
    def test_404_raises_athena_error(self, client):
        client.session.request.return_value = _mock_response(
            404, {"detail": "Not found"}
        )
        with pytest.raises(AthenaAPIError) as ei:
            client.get_tool("missing")
        assert ei.value.status_code == 404
        assert "Not found" in ei.value.detail

    def test_test_connection_returns_error_dict(self, client):
        client.session.request.return_value = _mock_response(
            401, {"detail": "Invalid token"}
        )
        result = client.test_connection()
        assert result["status"] == "error"
        assert result["authenticated"] is False
        assert result["error_code"] == 401


class TestPagination:
    def test_walks_next_links(self, client):
        # First page returns one item with a `next` URL; second page returns
        # one more item and no next.
        page1 = _mock_response(
            200,
            {
                "results": [{"id": 1}],
                "next": "https://athena.test/api/v1/tei/reports/?page=2",
            },
        )
        page2 = _mock_response(200, {"results": [{"id": 2}], "next": None})
        client.session.request.return_value = page1
        client.session.get.return_value = page2  # follow next via session.get

        out = client.list_reports()
        assert [r["id"] for r in out] == [1, 2]


class TestNormalizeValue:
    def test_year_underscore_keys(self):
        out = TEIClient._normalize_value(
            {"field_key": "x", "year_1": 100, "year_2": 200, "risk_adjustment": 0.1}
        )
        assert out["year_values"] == {"1": 100.0, "2": 200.0}
        assert out["risk_adjustment"] == 0.1

    def test_year_values_dict_passthrough(self):
        out = TEIClient._normalize_value(
            {
                "field_key": "x",
                "year_values": {"1": 50, "3": 75},
                "notes": "  hi ",
            }
        )
        assert out["year_values"] == {"1": 50.0, "3": 75.0}
        assert out["notes"] == "  hi "

    def test_initial_carried(self):
        out = TEIClient._normalize_value(
            {"field_key": "x", "initial": 1000, "year_1": 5}
        )
        assert out["initial"] == 1000.0

    def test_scalar_value(self):
        out = TEIClient._normalize_value({"field_key": "rate", "value": 0.10})
        assert out["value"] == 0.10
        assert "year_values" not in out


class TestUpdateValuesPayload:
    def test_wraps_in_envelope(self, client):
        client.session.request.return_value = _mock_response(200, {})
        client.update_values(
            "abc",
            [{"field_key": "x", "year_1": 100}, {"field_key": "y", "year_1": 200}],
        )
        body = client.session.request.call_args.kwargs["json"]
        assert "values" in body
        assert len(body["values"]) == 2
        assert body["values"][0]["field_key"] == "x"
        assert body["values"][0]["year_values"] == {"1": 100.0}