"""Tests for validate module."""

import json
import pytest

from ect.validate import (
    EXT_MAX_DEPTH,
    EXT_MAX_SIZE,
    validate_ext,
    validate_hash_format,
    valid_uuid,
)


def test_valid_uuid():
    assert valid_uuid("550e8400-e29b-41d4-a716-446655440000") is True
    assert valid_uuid("00000000-0000-0000-0000-000000000000") is True
    assert valid_uuid("") is False
    assert valid_uuid("not-a-uuid") is False
    assert valid_uuid("550e8400e29b41d4a716446655440000") is False  # no dashes


def test_validate_ext_none():
    validate_ext(None)
    validate_ext({})


def test_validate_ext_size():
    # Serialized JSON must exceed EXT_MAX_SIZE (4096) bytes
    big = {"x": "y" * (EXT_MAX_SIZE - 2)}  # "{\"x\":\"...\"}" + payload
    raw = json.dumps(big)
    assert len(raw.encode("utf-8")) > EXT_MAX_SIZE
    with pytest.raises(ValueError, match="max size"):
        validate_ext(big)


def test_validate_ext_depth():
    deep = {"a": 1}
    for _ in range(EXT_MAX_DEPTH):
        deep = {"n": deep}
    with pytest.raises(ValueError, match="depth"):
        validate_ext(deep)


def test_validate_hash_format_empty():
    validate_hash_format("")


def test_validate_hash_format_ok():
    # sha-256:base64url (minimal valid)
    validate_hash_format("sha-256:YQ")
    validate_hash_format("sha-384:YQ")
    validate_hash_format("sha-512:YQ")


def test_validate_hash_format_bad():
    with pytest.raises(ValueError, match="algorithm:base64url|inp_hash"):
        validate_hash_format("md5:abc")
    with pytest.raises(ValueError, match="algorithm:base64url|inp_hash"):
        validate_hash_format("no-colon")
    # Invalid base64 that triggers decode error (e.g. binary)
    with pytest.raises(ValueError, match="algorithm:base64url|inp_hash"):
        validate_hash_format("sha-256:YQ\x00")  # null in payload