"""内存替身：项目/章节 repo + 写章网关（端点测试用，无 DB/无网络）。

绝对导入 `from fakes_projects import ...`（包目录无 __init__.py，见 memory/gotchas）。
全局唯一名（避免跨包同名碰撞）。
"""

from __future__ import annotations

import uuid
from collections.abc import AsyncIterator
from typing import Any

from pydantic import BaseModel
from ww_core.domain.chapter_repo import ChapterDraftView, ChapterView
from ww_core.domain.project_repo import ProjectCreate, ProjectView
from ww_core.domain.repositories import DigestView
from ww_core.domain.review_repo import ReviewView
from ww_llm_gateway.types import Delta, LlmRequest, LlmResponse, ServedBy, Usage


class FakeProjectRepo:
    """实现 `ProjectRepo` Protocol 的内存版（按 owner_id 隔离）。"""

    def __init__(self) -> None:
        self.rows: dict[uuid.UUID, tuple[uuid.UUID, ProjectView]] = {}

    async def create(self, owner_id: uuid.UUID, data: ProjectCreate) -> ProjectView:
        pid = uuid.uuid4()
        view = ProjectView(
            id=pid,
            title=data.title,
            genre=data.genre,
            logline=data.logline,
            premise=data.premise,
            theme=data.theme,
            selling_points=list(data.selling_points),
            structure=data.structure,
        )
        self.rows[pid] = (owner_id, view)
        return view

    async def list_for_owner(self, owner_id: uuid.UUID) -> list[ProjectView]:
        return [v for (o, v) in self.rows.values() if o == owner_id]

    async def get(self, owner_id: uuid.UUID, project_id: uuid.UUID) -> ProjectView | None:
        entry = self.rows.get(project_id)
        if entry is None or entry[0] != owner_id:
            return None
        return entry[1]


class FakeChapterRepo:
    """实现 `ChapterRepo` Protocol：幂等覆盖同 (project_id, chapter_no) 草稿。"""

    def __init__(self) -> None:
        self.drafts: dict[tuple[uuid.UUID, int], ChapterDraftView] = {}
        self.accepted_versions: dict[tuple[uuid.UUID, int], int] = {}
        self.accepted_content: dict[tuple[uuid.UUID, int, int], str] = {}

    async def save_draft(
        self, project_id: uuid.UUID, chapter_no: int, *, text: str, volume: int = 1
    ) -> ChapterDraftView:
        view = ChapterDraftView(
            project_id=project_id,
            chapter_no=chapter_no,
            volume=volume,
            content=text,
            status="draft",
            version=1,
        )
        self.drafts[(project_id, chapter_no)] = view
        return view

    async def get_draft(self, project_id: uuid.UUID, chapter_no: int) -> ChapterDraftView | None:
        return self.drafts.get((project_id, chapter_no))

    async def max_version(self, project_id: uuid.UUID, chapter_no: int) -> int:
        versions = [
            v for (p, c), v in self.accepted_versions.items() if p == project_id and c == chapter_no
        ]
        draft = 1 if (project_id, chapter_no) in self.drafts else 0
        return max([*versions, draft], default=0)

    async def promote_to_accepted(
        self, project_id: uuid.UUID, chapter_no: int, *, content: str, volume: int = 1
    ) -> ChapterView:
        next_version = (await self.max_version(project_id, chapter_no)) + 1
        self.accepted_versions[(project_id, chapter_no)] = next_version
        self.accepted_content[(project_id, chapter_no, next_version)] = content
        return ChapterView(
            project_id=project_id,
            chapter_no=chapter_no,
            volume=volume,
            content=content,
            status="accepted",
            version=next_version,
        )

    async def latest_accepted(self, project_id: uuid.UUID, chapter_no: int) -> ChapterView | None:
        ver = self.accepted_versions.get((project_id, chapter_no))
        if ver is None:
            return None
        return ChapterView(
            project_id=project_id,
            chapter_no=chapter_no,
            volume=1,
            content=self.accepted_content[(project_id, chapter_no, ver)],
            status="accepted",
            version=ver,
        )


class FakeReviewRepo:
    """实现 `ReviewRepo` Protocol（内存留痕 + 历史 + 裁决；只 flush 语义无 DB）。"""

    def __init__(self, *, fail_set_decisions: bool = False) -> None:
        self.rows: list[ReviewView] = []
        self._fail_set_decisions = fail_set_decisions

    async def record(
        self,
        project_id: uuid.UUID,
        chapter_no: int,
        *,
        chapter_version: int | None = None,
        conflicts: list[dict[str, Any]],
        foreshadow_sug: list[dict[str, Any]] | None = None,
        style: dict[str, Any] | None = None,
        pace: dict[str, Any] | None = None,
        health_score: int | None = None,
    ) -> ReviewView:
        view = ReviewView(
            id=uuid.uuid4(),
            project_id=project_id,
            chapter_no=chapter_no,
            chapter_version=chapter_version,
            conflicts=[dict(c) for c in conflicts],
            foreshadow_sug=[dict(s) for s in (foreshadow_sug or [])],
            style=style,
            pace=pace,
            health_score=health_score,
        )
        # 新→旧：插到列表头部。
        self.rows.insert(0, view)
        return view

    async def list_for_chapter(self, project_id: uuid.UUID, chapter_no: int) -> list[ReviewView]:
        return [r for r in self.rows if r.project_id == project_id and r.chapter_no == chapter_no]

    async def set_decisions(self, review_id: uuid.UUID, *, decisions: dict[str, Any]) -> ReviewView:
        if self._fail_set_decisions:
            raise RuntimeError("boom: set_decisions failed (transaction rollback test)")
        for i, r in enumerate(self.rows):
            if r.id == review_id:
                updated = r.model_copy(update={"decisions": dict(decisions)})
                self.rows[i] = updated
                return updated
        raise LookupError(f"review not found: {review_id}")


class FakeDigestAppendRepo:
    """实现 `DigestAppendRepo` Protocol（内存 append-only）。"""

    def __init__(self) -> None:
        self.rows: list[tuple[uuid.UUID, int, dict[str, Any]]] = []

    async def append(
        self, project_id: uuid.UUID, chapter_no: int, *, facts: dict[str, Any]
    ) -> DigestView:
        self.rows.append((project_id, chapter_no, dict(facts)))
        return DigestView(chapter_no=chapter_no, facts=dict(facts))


class FakeSession:
    """最小 fake：记录 commit 次数（验收事务边界断言）。"""

    def __init__(self) -> None:
        self.commits = 0

    async def commit(self) -> None:
        self.commits += 1


class FakeReviewGateway:
    """实现审稿/digest 节点最小依赖（`run`）：吐固定结构化 `parsed`，绝不联网。"""

    def __init__(self, parsed: BaseModel | None = None, error: Exception | None = None) -> None:
        self._parsed = parsed
        self._error = error
        self.requests: list[LlmRequest] = []

    async def run(self, req: LlmRequest) -> LlmResponse:
        self.requests.append(req)
        if self._error is not None:
            raise self._error
        return LlmResponse(
            text=self._parsed.model_dump_json() if self._parsed else "{}",
            parsed=self._parsed,
            usage=Usage(
                provider="fake",
                model="fake",
                input_tokens=1,
                output_tokens=1,
                cost_minor=0,
                currency="USD",
            ),
            served_by=ServedBy(provider="fake", model="fake"),
        )


class FakeWriterGateway:
    """实现 write 节点最小依赖（`stream`）：吐固定 `Delta` 序列，绝不联网。

    可注入 `error` 以验证 SSE 归一层把异常归一为 error 事件。
    """

    def __init__(self, chunks: list[str] | None = None, error: Exception | None = None) -> None:
        self._chunks = chunks if chunks is not None else ["第一段。", "第二段。"]
        self._error = error
        self.requests: list[LlmRequest] = []

    async def stream(self, req: LlmRequest) -> AsyncIterator[Delta]:
        self.requests.append(req)
        for c in self._chunks:
            yield Delta(text=c)
        if self._error is not None:
            raise self._error