from dataclasses import FrozenInstanceError
from genesis.writer.models import ContentBlock, ChapterContent, GenerationContext, ChapterSpec


def test_content_block_defaults():
    b = ContentBlock(block_id="b1", type="paragraph", text="你好")
    assert b.level is None
    assert b.source_uris == []


def test_chapter_content_holds_blocks():
    b = ContentBlock(block_id="b1", type="heading", level=2, text="标题")
    c = ChapterContent(chapter_id="db_design", version=1, title="DB 设计", blocks=[b])
    assert c.blocks[0].type == "heading"
    assert c.version == 1


def test_generation_context_no_impact_field():
    ctx = GenerationContext(
        chapter_id="db_design", title="DB 设计",
        template_marker=ChapterSpec(chapter_id="db_design", title="DB 设计", section_placeholder="{{section:db_design}}"),
        structured_source=None, write_rules=["规则1"], design_rules=["规则2"],
        template_styles={"Heading 1"},
    )
    assert not hasattr(ctx, "impact")


def test_chapter_spec_placeholder_optional():
    s = ChapterSpec(chapter_id="x", title="X", section_placeholder=None)
    assert s.section_placeholder is None