from __future__ import annotations

import unittest

from techviz.layout import DiagramLayout, EdgePath, NodeBox
from techviz.quality import validate_layout
from techviz.spec import VizSpec


class QualityTests(unittest.TestCase):
    def test_detects_edge_passing_through_unrelated_node(self) -> None:
        spec = VizSpec.from_dict(
            {
                "version": "1.0",
                "id": "quality-case",
                "title": "Quality case",
                "question": "Does an edge cross a node?",
                "type": "architecture",
                "direction": "LR",
                "summary": "Synthetic quality test.",
                "alt": "Synthetic diagram with three nodes.",
                "long_description": "A line from A to C passes through unrelated node B.",
                "source_context": {},
                "groups": [],
                "nodes": [
                    {"id": "a", "label": "A", "kind": "service", "evidence": [], "assumption": True},
                    {"id": "b", "label": "B", "kind": "service", "evidence": [], "assumption": True},
                    {"id": "c", "label": "C", "kind": "service", "evidence": [], "assumption": True}
                ],
                "edges": [
                    {"id": "a-to-c", "from": "a", "to": "c", "label": "calls", "kind": "request", "evidence": [], "assumption": True}
                ]
            }
        )
        layout = DiagramLayout(
            width=500,
            height=240,
            nodes={
                "a": NodeBox("a", 20, 80, 100, 60, ["A"]),
                "b": NodeBox("b", 190, 80, 100, 60, ["B"]),
                "c": NodeBox("c", 360, 80, 100, 60, ["C"]),
            },
            groups={},
            edges={
                "a-to-c": EdgePath("a-to-c", [(120, 110), (360, 110)], 240, 70)
            },
        )
        issues = validate_layout(spec, layout)
        self.assertTrue(any(issue.code == "edge-through-node" for issue in issues))


if __name__ == "__main__":
    unittest.main()