#!/usr/bin/env python3
"""Dependency-free structural and scope validation for the Protocol sources."""

from __future__ import annotations

import json
import pathlib
import hashlib
import re
import sys

ROOT = pathlib.Path(__file__).resolve().parents[1]


def main() -> int:
    schema_path = ROOT / "schemas/control-v1.schema.json"
    schema = json.loads(schema_path.read_text(encoding="utf-8"))
    assert schema["$schema"].endswith("2020-12/schema")
    defs = schema["$defs"]
    assert len(defs) >= 16
    for name, definition in defs.items():
        assert definition["type"] == "object", name
        assert definition["additionalProperties"] is False, name
        assert set(definition["required"]).issubset(definition["properties"]), name

    compatibility = json.loads((ROOT / "compatibility.json").read_text(encoding="utf-8"))
    assert set([compatibility["current"], compatibility["n_minus_1"], compatibility["n_minus_2"]]) == {"1", "0", "-1"}
    assert len(set(compatibility["unsupported"])) == len(compatibility["unsupported"])

    for registry in ("registries/features.json", "registries/datagrams.json"):
        value = json.loads((ROOT / registry).read_text(encoding="utf-8"))
        entries = value.get("features", value.get("datagrams"))
        assert entries and len({entry["id"] for entry in entries}) == len(entries)
        for entry in entries:
            maximum = entry.get("max_frame_bytes", entry.get("max_payload_bytes"))
            assert isinstance(maximum, int) and 1 <= maximum <= 65536

    manifest = json.loads((ROOT / "fixtures/valid/manifest.json").read_text(encoding="utf-8"))
    assert set(manifest).issubset(set(defs["ConnectionManifest"]["properties"]))
    forbidden = json.loads((ROOT / "fixtures/invalid/manifest-provider-field.json").read_text(encoding="utf-8"))
    assert "provider_url" not in defs["ConnectionManifest"]["properties"] and "provider_url" in forbidden

    expected_header = "id\tversion\tkind\tinput\texpected"
    ids = set()
    for fixture_path in sorted((ROOT / "fixtures/conformance").glob("*.tsv")):
        lines = fixture_path.read_text(encoding="utf-8").splitlines()
        assert lines and lines[0] == expected_header, fixture_path
        for line in lines[1:]:
            fields = line.split("\t")
            assert len(fields) == 5, line
            assert fields[0] not in ids, fields[0]
            ids.add(fields[0])
            assert fields[4] == "valid" or fields[4].startswith("invalid:"), line

    fixture_manifest = json.loads((ROOT / "fixtures/manifest.json").read_text(encoding="utf-8"))
    assert fixture_manifest["files"] == sorted(
        path.relative_to(ROOT).as_posix() for path in (ROOT / "fixtures/conformance").glob("*.tsv")
    )
    fixture_hash = hashlib.sha256()
    for relative in fixture_manifest["files"]:
        fixture_hash.update(relative.encode("utf-8"))
        fixture_hash.update(b"\0")
        fixture_hash.update((ROOT / relative).read_bytes())
        fixture_hash.update(b"\0")
    assert fixture_manifest["corpus_sha256"] == fixture_hash.hexdigest()

    openapi = (ROOT / "openapi/control-v1.yaml").read_text(encoding="utf-8")
    assert "openapi: 3.1.0" in openapi
    assert "/api/v1/auth/refresh:" in openapi and "/api/v1/resources:" in openapi and "/api/v1/events:" in openapi
    assert "provider_url" not in openapi and "vm_address" not in openapi
    print("Protocol source validation passed")
    return 0


if __name__ == "__main__":
    try:
        raise SystemExit(main())
    except (AssertionError, OSError, json.JSONDecodeError) as exc:
        print(f"validate: {exc}", file=sys.stderr)
        raise SystemExit(1)