from pathlib import Path

from click.testing import CliRunner

from markitect_tool.cli import main
from markitect_tool.content_class import load_content_classes


def test_c3_linearization_for_diamond_inheritance():
    registry = load_content_classes(
        {
            "classes": {
                "base": {"slots": {"sections": ["Overview"]}},
                "left": {"extends": ["base"], "slots": {"sections": ["Left"]}},
                "right": {"extends": ["base"], "slots": {"sections": ["Right"]}},
                "leaf": {"extends": ["left", "right"], "slots": {"title": "Leaf"}},
            }
        }
    )

    assert registry.linearize("leaf") == ["leaf", "left", "right", "base"]


def test_compose_merges_slots_with_explicit_policies():
    registry = load_content_classes(
        {
            "classes": {
                "base": {
                    "slots": {
                        "sections": ["Overview"],
                        "assertions": {"tone": "plain", "depth": "short"},
                    }
                },
                "market": {
                    "extends": ["base"],
                    "slots": {
                        "sections": ["Pricing"],
                        "assertions": {"depth": "detailed"},
                    },
                    "merge_policies": {
                        "sections": "append",
                        "assertions": "deep_merge",
                    },
                },
                "instance": {
                    "extends": ["market"],
                    "slots": {"sections": ["Risks"]},
                    "merge_policies": {"sections": "append"},
                },
            }
        }
    )

    result = registry.compose("instance")

    assert result.valid
    assert result.slots["sections"] == ["Overview", "Pricing", "Risks"]
    assert result.slots["assertions"] == {"tone": "plain", "depth": "detailed"}


def test_compose_reports_error_on_conflict():
    registry = load_content_classes(
        {
            "classes": {
                "base": {"slots": {"owner": "A"}},
                "instance": {
                    "extends": ["base"],
                    "slots": {"owner": "B"},
                    "merge_policies": {"owner": "error_on_conflict"},
                },
            }
        }
    )

    result = registry.compose("instance")

    assert not result.valid
    assert result.diagnostics[0].code == "content_class.merge_conflict"


def test_mkt_class_resolve_outputs_text(tmp_path: Path):
    class_file = tmp_path / "classes.yaml"
    class_file.write_text(
        """classes:
  base:
    slots:
      sections:
        - Overview
  instance:
    extends:
      - base
    slots:
      sections:
        - Risks
    merge_policies:
      sections: append
""",
        encoding="utf-8",
    )

    result = CliRunner().invoke(main, ["class", "resolve", str(class_file), "instance"])

    assert result.exit_code == 0
    assert "linearization: instance -> base" in result.output
    assert "Overview" in result.output
    assert "Risks" in result.output