"""海报输出格式契约测试。"""
import sys
from pathlib import Path

import pytest

sys.path.insert(0, str(Path(__file__).resolve().parents[1] / "api"))


def test_poster_formats_have_distinct_layout_and_output_dimensions():
    from insurance.poster.format_registry import list_poster_formats

    formats = list_poster_formats()
    assert [item["id"] for item in formats] == [
        "single_2_3",
        "single_9_16",
        "long_1242_auto",
    ]
    assert formats[0]["layout"] == {"width": 512, "height": 768}
    assert formats[0]["output"] == {"width": 1024, "height": 1536}
    assert formats[2]["layout"] == {"width": 414, "height": None}
    assert formats[2]["output"] == {"width": 1242, "height": None}


def test_resolve_poster_format_rejects_mode_mismatch_and_unknown_values():
    from insurance.poster.format_registry import PosterFormatError, resolve_poster_format

    with pytest.raises(PosterFormatError, match="不支持长图"):
        resolve_poster_format(format_id="single_2_3", output_mode="long")

    with pytest.raises(PosterFormatError, match="不支持的海报格式"):
        resolve_poster_format(format_id="custom_999", output_mode="single")

    with pytest.raises(PosterFormatError, match="不支持的海报尺寸"):
        resolve_poster_format(legacy_size="2480x3508", output_mode="single")

    with pytest.raises(PosterFormatError, match="不支持的输出模式"):
        resolve_poster_format(output_mode="square")


def test_legacy_sizes_map_to_safe_formats_without_silent_shape_changes():
    from insurance.poster.format_registry import resolve_poster_format

    assert resolve_poster_format(
        legacy_size="1024x1792",
        output_mode="single",
    )["id"] == "single_2_3"
    assert resolve_poster_format(
        legacy_size="1080x1920",
        output_mode="single",
    )["id"] == "single_9_16"
    assert resolve_poster_format(
        legacy_size="1080x4320",
        output_mode="long",
    )["id"] == "long_1242_auto"


def test_background_asset_size_is_provider_size_not_final_poster_size():
    from insurance.poster.format_registry import resolve_poster_format

    long_format = resolve_poster_format(
        format_id="long_1242_auto",
        output_mode="long",
    )
    assert long_format["exportSize"] == "1242xauto"
    assert long_format["backgroundAssetSize"] == "1024x1536"


def test_custom_long_height_is_bounded_and_explicit():
    from insurance.poster.format_registry import PosterFormatError, resolve_custom_long_height

    assert resolve_custom_long_height(4500, "long") == 4500
    assert resolve_custom_long_height(None, "long") is None
    with pytest.raises(PosterFormatError, match="1920"):
        resolve_custom_long_height(1200, "long")
    with pytest.raises(PosterFormatError, match="仅长图"):
        resolve_custom_long_height(4500, "single")


def test_fallback_background_never_draws_marketing_copy(monkeypatch):
    from PIL import ImageDraw
    from insurance.poster.image_generator import generate_fallback

    def fail_if_text_is_drawn(*_args, **_kwargs):
        raise AssertionError("fallback 背景不应绘制任何文案")

    monkeypatch.setattr(ImageDraw.ImageDraw, "text", fail_if_text_is_drawn)
    image_bytes = generate_fallback(
        {
            "headline": "不应进入背景",
            "body": "不应进入背景",
            "call_to_action": "不应进入背景",
        },
        size="1024x1536",
    )
    assert image_bytes.startswith(b"\x89PNG\r\n\x1a\n")