"""Tests for backgrounds-manifest-to-spec.py — manifest JSON to ApplyBackgrounds spec."""

import pytest


def test_spec_sorted_by_slide_number(backgrounds_manifest_to_spec):
    manifest = {"backgrounds": {"10": "/a/slide-10.jpg", "2": "/a/slide-02.jpg"}}
    spec = backgrounds_manifest_to_spec.manifest_to_spec(manifest)
    # Numeric (not lexical) sort: 2 before 10.
    assert spec == "2=/a/slide-02.jpg;10=/a/slide-10.jpg"


def test_spec_single_entry(backgrounds_manifest_to_spec):
    manifest = {"backgrounds": {"3": "/img/slide-03.png"}}
    assert backgrounds_manifest_to_spec.manifest_to_spec(manifest) == "3=/img/slide-03.png"


def test_empty_manifest_raises(backgrounds_manifest_to_spec):
    with pytest.raises(ValueError):
        backgrounds_manifest_to_spec.manifest_to_spec({"backgrounds": {}})
    with pytest.raises(ValueError):
        backgrounds_manifest_to_spec.manifest_to_spec({})


def test_reserved_delimiter_in_path_raises(backgrounds_manifest_to_spec):
    # A ';' or '=' in a path would corrupt the spec the VBA macro parses.
    with pytest.raises(ValueError):
        backgrounds_manifest_to_spec.manifest_to_spec({"backgrounds": {"1": "/a/b;c.jpg"}})
    with pytest.raises(ValueError):
        backgrounds_manifest_to_spec.manifest_to_spec({"backgrounds": {"1": "/a/b=c.jpg"}})


def test_malformed_input_raises_valueerror_not_traceback(backgrounds_manifest_to_spec):
    m2s = backgrounds_manifest_to_spec.manifest_to_spec
    # Non-object manifest, non-object backgrounds, non-int key, non-string path
    # all surface as ValueError (actionable), never an unhandled TypeError/etc.
    for bad in (
        [1, 2, 3],                                  # manifest not a dict
        {"backgrounds": ["/a/slide-01.jpg"]},        # backgrounds not a dict
        {"backgrounds": {"one": "/a/slide-01.jpg"}}, # key not an integer
        {"backgrounds": {"1": 12345}},               # path not a string
    ):
        with pytest.raises(ValueError):
            m2s(bad)