"""Tests for template value source API: CRUD, validate-template, delete-protection."""

from unittest.mock import MagicMock

import pytest
from fastapi import FastAPI
from fastapi.testclient import TestClient

from ledgrab.api import dependencies as deps
from ledgrab.api.routes.value_sources import router
from ledgrab.storage.value_source_store import ValueSourceStore


@pytest.fixture
def _route_db(tmp_path):
    from ledgrab.storage.database import Database

    db = Database(tmp_path / "test.db")
    yield db
    db.close()


@pytest.fixture
def store(_route_db):
    return ValueSourceStore(_route_db)


@pytest.fixture
def client(store):
    app = FastAPI()
    app.include_router(router)

    from ledgrab.api.auth import verify_api_key

    app.dependency_overrides[verify_api_key] = lambda: "test-user"
    app.dependency_overrides[deps.get_value_source_store] = lambda: store
    app.dependency_overrides[deps.get_processor_manager] = lambda: MagicMock()
    app.dependency_overrides[deps.get_output_target_store] = lambda: MagicMock(
        get_all_targets=lambda: []
    )

    deps._deps["processor_manager"] = MagicMock()
    return TestClient(app, raise_server_exceptions=False)


def _create(client, **over):
    body = {
        "source_type": "template",
        "name": "Combo",
        "template": "min(a * 2, 1)",
        "inputs": [{"name": "a", "value_source_id": ""}],
        "default_value": 0.2,
    }
    body.update(over)
    return client.post("/api/v1/value-sources", json=body)


class TestCRUD:
    def test_create_get_list_roundtrip(self, client):
        r = _create(client)
        assert r.status_code == 201, r.text
        body = r.json()
        assert body["source_type"] == "template"
        assert body["return_type"] == "float"
        assert body["template"] == "min(a * 2, 1)"
        assert body["inputs"] == [{"name": "a", "value_source_id": ""}]
        assert body["default_value"] == 0.2
        sid = body["id"]

        got = client.get(f"/api/v1/value-sources/{sid}").json()
        assert got["template"] == "min(a * 2, 1)"

        lst = client.get("/api/v1/value-sources").json()
        assert any(s["id"] == sid and s["source_type"] == "template" for s in lst["sources"])

    def test_update(self, client):
        sid = _create(client).json()["id"]
        r = client.put(
            f"/api/v1/value-sources/{sid}",
            json={"source_type": "template", "template": "clamp(a * 3)"},
        )
        assert r.status_code == 200, r.text
        assert r.json()["template"] == "clamp(a * 3)"

    def test_create_compile_error_returns_400(self, client):
        r = _create(client, template="a +")
        assert r.status_code == 400

    def test_create_reserved_name_returns_400(self, client):
        r = _create(client, inputs=[{"name": "min", "value_source_id": ""}])
        assert r.status_code == 400


class TestDeleteProtection:
    def test_delete_blocked_when_referenced(self, client):
        base = client.post(
            "/api/v1/value-sources",
            json={"source_type": "static", "name": "Base", "value": 0.5},
        ).json()
        _create(
            client,
            name="Uses",
            template="b",
            inputs=[{"name": "b", "value_source_id": base["id"]}],
        )
        r = client.delete(f"/api/v1/value-sources/{base['id']}")
        assert r.status_code == 400
        assert "referenced by" in r.json()["detail"]


class TestValidateEndpoint:
    def _validate(self, client, **body):
        return client.post("/api/v1/value-sources/validate-template", json=body)

    def test_valid_expression(self, client):
        r = self._validate(
            client,
            template="min(a, b)",
            inputs=[{"name": "a", "value_source_id": ""}, {"name": "b", "value_source_id": ""}],
        )
        assert r.status_code == 200
        data = r.json()
        assert data["valid"] is True
        assert set(data["variables"]) == {"a", "b"}

    def test_compile_error(self, client):
        r = self._validate(client, template="a +", inputs=[])
        data = r.json()
        assert data["valid"] is False
        assert data["error"]

    def test_reserved_name(self, client):
        r = self._validate(
            client, template="min(0,1)", inputs=[{"name": "raw", "value_source_id": ""}]
        )
        assert r.json()["valid"] is False

    def test_missing_input_is_warning_not_error(self, client):
        r = self._validate(
            client, template="a", inputs=[{"name": "a", "value_source_id": "vs_nope"}]
        )
        data = r.json()
        assert data["valid"] is True
        assert data["warnings"]

    def test_unbound_variable_is_error(self, client):
        # Typo: expression uses 'ha_enti' but the input is named 'ha_entity'.
        r = self._validate(
            client, template="ha_enti", inputs=[{"name": "ha_entity", "value_source_id": ""}]
        )
        data = r.json()
        assert data["valid"] is False
        assert any("unbound" in e for e in data["errors"])

    def test_cycle_detected_with_id(self, client):
        t1 = _create(client, name="T1", template="clamp(0.5)", inputs=[]).json()
        t2 = _create(
            client,
            name="T2",
            template="x",
            inputs=[{"name": "x", "value_source_id": t1["id"]}],
        ).json()
        # Editing t1 to point at t2 would close a cycle.
        r = self._validate(
            client, template="x", inputs=[{"name": "x", "value_source_id": t2["id"]}], id=t1["id"]
        )
        assert r.json()["valid"] is False


class TestResponseMapCoverage:
    def test_template_in_response_map(self):
        from ledgrab.api.routes.value_sources import _RESPONSE_MAP
        from ledgrab.storage.value_source import TemplateValueSource

        assert TemplateValueSource in _RESPONSE_MAP

    def test_template_in_all_unions(self):
        from ledgrab.api.schemas import value_sources as sch

        for union_name in ("ValueSourceResponse", "ValueSourceCreate", "ValueSourceUpdate"):
            src = repr(getattr(sch, union_name))
            assert "template" in src.lower() or "Template" in src