from __future__ import annotations

from pathlib import Path
import sys
import unittest


RUNTIME = Path(__file__).resolve().parents[1] / "runtime"
sys.path.insert(0, str(RUNTIME))
import template_renderer  # noqa: E402


class TemplateRendererTest(unittest.TestCase):
    def test_allowlist_and_missing_values_are_fail_closed(self) -> None:
        with self.assertRaises(template_renderer.TemplateRenderError) as unknown:
            template_renderer.render("{{unknown}}", {"unknown": "x"}, allowed={"known"})
        self.assertEqual(unknown.exception.code, "UNKNOWN_PLACEHOLDER")
        with self.assertRaises(template_renderer.TemplateRenderError) as missing:
            template_renderer.render("{{known}}", {}, allowed={"known"})
        self.assertEqual(missing.exception.code, "UNRESOLVED_PLACEHOLDER")

    def test_generated_hash_changes_only_with_generated_region(self) -> None:
        first = "before\n<!-- GENERATED: branch-contract:start -->\nA\n<!-- GENERATED: branch-contract:end -->\nafter\n"
        outside = first.replace("before", "changed")
        inside = first.replace("\nA\n", "\nB\n")
        self.assertEqual(template_renderer.generated_sha256(first), template_renderer.generated_sha256(outside))
        self.assertNotEqual(template_renderer.generated_sha256(first), template_renderer.generated_sha256(inside))

    def test_branch_template_has_stable_parent_goal_scope_ids_in_both_surfaces(self) -> None:
        template = Path(__file__).resolve().parents[2] / "templates/branch-note-template.md"
        text = template.read_text(encoding="utf-8")
        for section_id in ("branch-parent", "branch-goal", "branch-scope"):
            self.assertEqual(text.count(f"<!-- section-id: {section_id} -->"), 2)

        runtime = template_renderer.extract_region(
            text,
            template_renderer.REGION_START,
            template_renderer.REGION_END,
        )
        positions = [
            runtime.index("section-id: branch-parent"),
            runtime.index("section-id: branch-contract-packet"),
            runtime.index("section-id: branch-goal"),
            runtime.index("section-id: branch-scope"),
        ]
        self.assertEqual(positions, sorted(positions))


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