"""Regression guards for canonical documentation and instruction contracts."""

from __future__ import annotations

from pathlib import Path


PROJECT_ROOT = Path(__file__).resolve().parents[1]


ACTIVE_CONTRACT_FILES = (
    ".github/instructions/services.instructions.md",
    ".github/instructions/ui.instructions.md",
    ".github/instructions/error-handling.instructions.md",
    ".github/skills/python-code-reviewer/skill.md",
    ".github/skills/evidence-provenance-auditor/skill.md",
    "docs/ver4/index_v4.md",
    "docs/ver4/architecture_v4.md",
    "docs/ver4/requirements_v4.md",
    "docs/ver4/schema_v4.md",
    "docs/ver4/error_handling_v4.md",
    "docs/ui/README.md",
)


LEGACY_REFERENCE_MARKERS = (
    "docs-v4x-archive",
    "docs/ver4/history.md",
    "docs/ver4.0",
    "docs/ver4.1",
    "docs/ver4.2",
    "docs/ver4.3",
    "docs/ver4.4",
    "docs/ver4.5",
    "docs/ver4.6",
    "docs/ver4.7",
)


def _read(relative_path: str) -> str:
    return (PROJECT_ROOT / relative_path).read_text(encoding="utf-8")


def test_active_contract_files_are_present():
    """Guard the guard: ensure all expected authority files are scanned."""
    missing = [path for path in ACTIVE_CONTRACT_FILES if not (PROJECT_ROOT / path).exists()]
    assert missing == []


def test_no_legacy_authority_references_in_active_contract_files():
    """Active contracts must not route authority through removed V4 revision trees."""
    violations: dict[str, list[str]] = {}
    for relative_path in ACTIVE_CONTRACT_FILES:
        text = _read(relative_path)
        found = [marker for marker in LEGACY_REFERENCE_MARKERS if marker in text]
        if found:
            violations[relative_path] = found
    assert violations == {}


def test_canonical_authority_references_are_present():
    """Critical instruction and skill files must keep canonical references explicit."""
    required_fragments = {
        ".github/instructions/services.instructions.md": (
            "docs/ver4/",
            "./error-handling.instructions.md",
            "src/transcription/db/models.py",
            "docs/ver4/schema_v4.md",
            "append-only",
        ),
        ".github/instructions/ui.instructions.md": (
            "docs/ver4/",
            "./error-handling.instructions.md",
            "src/transcription/db/models.py",
            "docs/ver4/schema_v4.md",
        ),
        ".github/instructions/error-handling.instructions.md": (
            "docs/ver4/error_handling_v4.md",
            "docs/ver4/requirements_v4.md",
        ),
        ".github/skills/python-code-reviewer/skill.md": (
            "docs/ver4/*",
            "docs/ver4/schema_v4.md",
            ".github/instructions/error-handling.instructions.md",
        ),
        ".github/skills/evidence-provenance-auditor/skill.md": (
            "docs/ver4/schema_v4.md",
            "docs/ver4/requirements_v4.md",
            "docs/ver4/error_handling_v4.md",
        ),
    }

    missing: dict[str, list[str]] = {}
    for relative_path, fragments in required_fragments.items():
        text = _read(relative_path)
        absent = [fragment for fragment in fragments if fragment not in text]
        if absent:
            missing[relative_path] = absent
    assert missing == {}