"""录制稳健性：章节结果落盘快照 + 可恢复（P0-b）。

真实 LLM 长耗时串行生成，录制重拍时不应从头重跑。本文件验证：
  - 每章生成后写快照（JSON）
  - 重跑时命中快照的章节跳过 LLM（即使引擎不可用也能完成文档）
  - 快照损坏时忽略并从头生成
  - WriterState 可 JSON 往返
"""
import json
from types import SimpleNamespace

from docx import Document

from genesis.data_models import ChapterMarker, ParsedTemplate
from genesis.writer.orchestrator import WriteOrchestrator
from genesis.writer.writer_state import WriterState
from genesis.writer.models import ChapterContent, ContentBlock


class RecordingEngine:
    def __init__(self):
        self.calls = []

    def chat_structured(self, *, session_id, prompt, variables, schema, retry_count=2):
        self.calls.append(variables["title"])
        return SimpleNamespace(
            data={"title": variables["title"], "blocks": [
                {"type": "paragraph", "text": f"{variables['title']}の内容"},
                {"type": "table", "headers": ["ID", "名称"], "rows": [["1", "a"]]},
            ]},
            status="ok",
        )


class ExplodingEngine:
    """若被调用即失败：用于证明快照命中时不再走 LLM。"""

    def chat_structured(self, **kwargs):
        raise AssertionError("不应调用 LLM（章节快照应命中）")


def _two_chapter_template(path):
    doc = Document()
    doc.add_paragraph("第1章 機能一覧", style="Heading 1")
    doc.add_paragraph("{{section:function_list}}")
    doc.add_paragraph("第2章 画面一覧", style="Heading 1")
    doc.add_paragraph("{{section:screen_list}}")
    doc.save(path)


def _parsed(tpl):
    return ParsedTemplate(
        file_name=tpl,
        sections=[
            ChapterMarker(type="heading", name="第1章 機能一覧", level=1),
            ChapterMarker(type="placeholder", name="section:function_list", level=0),
            ChapterMarker(type="heading", name="第2章 画面一覧", level=1),
            ChapterMarker(type="placeholder", name="section:screen_list", level=0),
        ],
        placeholders={}, styles={"defined": ["Heading 1"], "used": ["Heading 1"]},
    )


def _run(tpl, out, engine, snap):
    return WriteOrchestrator().generate(
        SimpleNamespace(template=_parsed(tpl)), str(out),
        samples_dir="nonexistent_dir_xyz", engine=engine,
        template_path=str(tpl), snapshot_path=str(snap),
    )


def test_snapshot_written_with_all_chapters(tmp_path):
    tpl, out, snap = tmp_path / "t.docx", tmp_path / "o.docx", tmp_path / "snap.json"
    _two_chapter_template(str(tpl))
    _run(tpl, out, RecordingEngine(), snap)

    payload = json.loads(snap.read_text(encoding="utf-8"))
    assert set(payload["chapters"]) == {"function_list", "screen_list"}
    assert payload["chapters"]["function_list"]["blocks"][0]["type"] == "paragraph"


def test_resume_from_snapshot_skips_llm(tmp_path):
    tpl, out1, snap = tmp_path / "t.docx", tmp_path / "o1.docx", tmp_path / "snap.json"
    _two_chapter_template(str(tpl))
    _run(tpl, out1, RecordingEngine(), snap)

    # 第二次：引擎会爆炸，但快照命中 → 不调用 LLM，仍产出完整文档
    out2 = tmp_path / "o2.docx"
    _run(tpl, out2, ExplodingEngine(), snap)
    joined = "\n".join(p.text for p in Document(str(out2)).paragraphs)
    assert "第1章 機能一覧の内容" in joined
    assert "第2章 画面一覧の内容" in joined


def test_corrupt_snapshot_ignored_and_regenerated(tmp_path):
    tpl, out, snap = tmp_path / "t.docx", tmp_path / "o.docx", tmp_path / "snap.json"
    _two_chapter_template(str(tpl))
    snap.write_text("{ this is not json", encoding="utf-8")

    engine = RecordingEngine()
    _run(tpl, out, engine, snap)
    assert len(engine.calls) == 2                      # 损坏快照 → 从头生成
    assert json.loads(snap.read_text(encoding="utf-8"))["chapters"]   # 并重写有效快照


def test_snapshot_with_extra_chapter_ignored(tmp_path):
    """快照含当前模板没有的章节 id → 忽略该章，其余照常生成。"""
    tpl, out, snap = tmp_path / "t.docx", tmp_path / "o.docx", tmp_path / "snap.json"
    _two_chapter_template(str(tpl))
    snap.write_text(json.dumps({
        "order": ["function_list", "screen_list", "ghost"],
        "chapters": {"ghost": {"chapter_id": "ghost", "version": 1,
                               "title": "幽灵章", "blocks": []}},
    }, ensure_ascii=False), encoding="utf-8")

    engine = RecordingEngine()
    _run(tpl, out, engine, snap)
    assert len(engine.calls) == 2       # 两章均重新生成，幽灵章被忽略


def test_generate_with_explicit_meta_skips_defaults(tmp_path):
    """显式传入 meta → 不再构造默认 meta（覆盖分支）。"""
    tpl, out = tmp_path / "t.docx", tmp_path / "o.docx"
    _two_chapter_template(str(tpl))
    contents = WriteOrchestrator().generate(
        SimpleNamespace(template=_parsed(tpl)), str(out),
        samples_dir="nonexistent_dir_xyz", engine=RecordingEngine(),
        template_path=str(tpl),
        meta={"doc_title": "T", "version": "v9", "created_at": "2026-01-01"},
    )
    assert len(contents) == 2


def test_writer_state_dict_roundtrip():
    st = WriterState(["a"])
    st.record_success(ChapterContent(chapter_id="a", version=1, title="T", blocks=[
        ContentBlock(block_id="1", type="table", headers=["H1", "H2"], rows=[["x", "y"]]),
    ]))
    st2 = WriterState.from_dict(st.to_dict())
    assert st2.summary_of("a") == st.summary_of("a")
    assert st2.to_dict()["chapters"]["a"]["blocks"][0]["headers"] == ["H1", "H2"]