"""S1 预审接口层：材料集合导入与事实确认。

命名空间（claude_use/T00/04-first-slice-contracts.md §1 定案 P1）：
    /api/xingbang/risk-agent/project-assistant/prescreen/...

挂在 project-assistant 前缀之下，因此**复用现有鉴权与代理，零改动**：
- `authorize()` 的角色→路径表已有 `path.startswith("project-assistant/")` → 客户经理放行；
  reviewer 的写豁免同样覆盖该前缀（backend/api/risk_agent_access.py:49,53）。
- 同源代理 `/api/risk-agent/[...path]` 已转发 Authorization / X-Xingbang-Demo-Role /
  Idempotency-Key（src/app/api/risk-agent/[...path]/route.ts:7）。
**不**使用设计草案原提的 `/api/prescreen` + `/api/core/prescreen`：那条路要求 admin
角色，且需改三处鉴权/代理代码。

错误信封（T00/04 §2 决策 D2）：**只在本模块内**输出
`{error:{code,message,retryable,request_id}}`。不改 `api/project_assistant.translate()`，
也不注册 app 级处理器——既有端点的 `{"detail": ...}` 形状完全不变。

404 统一口径（03 §2）：不存在与无访问权一律对外 404，不泄露对象是否存在。
既有 `check_project` 对无权项目抛 403 且被 5 个模块共用，故**不改它**，由本模块的
`scope()` 把访问失败包装成 404；演示域策略仍按 403（E-03 语义）。
"""

from __future__ import annotations

import hashlib

from fastapi import APIRouter, Depends, HTTPException, Request
from fastapi.exception_handlers import request_validation_exception_handler
from fastapi.exceptions import RequestValidationError
from fastapi.responses import JSONResponse
from pydantic import BaseModel, ConfigDict, Field

from api.project_assistant import enabled, role
from api.risk_agent_access import authorize, check_project
from contracts.prescreen import (
    DESC_MAX,
    EVIDENCE_MAX,
    ID_MAX,
    MAX_BATCH_FILES,
    NOTE_MAX,
    ErrorCode,
    S1_ERROR_HTTP,
    S1_ERROR_RETRYABLE,
)
from services import assistant_store as store
from services import (component_registry as registry, experience_extraction, fact_conflict,
                       history_cases, improvements, knowledge_cards, material_import,
                       prescreen_sandbox, prescreen_store, review_plan, trajectory)
from services.assistant_settings import flags
from services.fact_conflict import FactConflictUnresolved
from services.project_assistant import ProjectAssistantService

router = APIRouter(
    prefix="/api/xingbang/risk-agent/project-assistant/prescreen",
    dependencies=[Depends(authorize), Depends(enabled)],
    tags=["兴邦预审 S1"],
)

DEMO_PROJECTS = ("DEMO-A", "DEMO-B", "DEMO-C")
NOT_FOUND_MESSAGE = "对象不可访问或不存在"


# ---------------------------------------------------------------- 请求模型
class Input(BaseModel):
    """与既有 api/project_assistant.Input 同口径：禁止未知字段（E-07）。"""

    model_config = ConfigDict(extra="forbid")


class ImportBatchInput(Input):
    # 清单条目只有 4 个字段；id/status/received_at 由服务端生成（03 §9.4）。
    # data_domain 不在请求里：从项目读取，避免客户端与项目数据域不一致。
    manifest: list[dict] = Field(min_length=1, max_length=MAX_BATCH_FILES)


class RetryInput(Input):
    item_ids: list[str] = Field(min_length=1, max_length=MAX_BATCH_FILES)
    expected_revision: int = Field(ge=1)


class CancelInput(Input):
    expected_revision: int = Field(ge=1)


class ResolveInput(Input):
    selected_evidence_ids: list[str] = Field(min_length=1, max_length=EVIDENCE_MAX)
    resolution_note: str = Field(min_length=1, max_length=NOTE_MAX)
    expected_revision: int = Field(ge=1)


class SimulationInput(Input):
    """T09 沙盘请求：只传假设动作键，不传任何概率或维度值。"""

    assumptions: list[str] = Field(default_factory=list, max_length=8)
    expected_revision: int | None = Field(default=None, ge=1)


class ImprovementInput(Input):
    """T11 改进候选。必须说明改什么、依据哪些运行或结果。"""

    target: str = Field(default="knowledge", max_length=40)
    target_ref: dict
    proposed_revision_ref: dict
    change_summary: str = Field(min_length=1, max_length=DESC_MAX)
    source_run_ids: list[str] = Field(default_factory=list, max_length=200)
    outcome_ids: list[str] = Field(default_factory=list, max_length=200)


class TransitionInput(Input):
    """状态机动作。评测动作必须随请求提交对照结果，不能只改状态。"""

    action: str = Field(min_length=1, max_length=40)
    expected_revision: int | None = Field(default=None, ge=1)
    evaluation: dict | None = None
    contrast: dict | None = None
    released_ref: dict | None = None
    reason: str | None = Field(default=None, max_length=DESC_MAX)


class ExtractionInput(Input):
    """历史提炼请求：只选来源事件并给出提炼要求。

    刻意**不接受**字段名、引擎、工具或模型参数——提炼输出什么由模型按标准字段表提出，
    调用方不能借此指定"要提炼成哪条规则"（03 §9.4：不开放任意 prompt/路径/SQL 执行 API）。
    """

    event_ids: list[str] = Field(default_factory=list, max_length=EVIDENCE_MAX)
    requirement: str = Field(default="", max_length=DESC_MAX)


class CandidateInput(Input):
    """人工新增知识候选（AC-43 的"人工新增"入口）。

    `content` 直接使用注册表既有的执行体形状（skill 的 engine/inputs/code… 或
    rule_set 的 conditions/effect），**不在接口层另定义一套卡片语义**；
    合法性仍由 `knowledge_cards.propose()` → `component_registry.validate()` 判定。
    """

    kind: str = Field(min_length=1, max_length=40)
    title: str = Field(min_length=1, max_length=200)
    content: dict
    origin: str = Field(default="manual", max_length=40)
    version: str = Field(default="1.0.0", max_length=70)
    source_event_ids: list[str] = Field(default_factory=list, max_length=EVIDENCE_MAX)
    source_evidence_ids: list[str] = Field(default_factory=list, max_length=EVIDENCE_MAX)
    card_scope: str = Field(default="project", max_length=40)
    team_id: str | None = Field(default=None, max_length=ID_MAX)
    expires_at: str | None = None


class ReviseInput(Input):
    """候选修订（AC-51）：给自然语言要求，或直接给结构化修改；两者都没有即拒绝。"""

    requirement: str = Field(default="", max_length=DESC_MAX)
    changes: dict | None = None
    note: str = Field(default="", max_length=DESC_MAX)
    expected_revision: int | None = Field(default=None, ge=1)


class ReviewPlanInput(Input):
    """方案装配请求：只引用**已发布**组件 id，不接受工具配置面（ADR-11）。"""

    name: str = Field(min_length=1, max_length=200)
    skills: list[str] = Field(min_length=1, max_length=100)
    rules: list[str] = Field(default_factory=list, max_length=100)
    cards: list[str] = Field(default_factory=list, max_length=100)
    template: str = Field(min_length=1, max_length=ID_MAX)
    budget: dict | None = None
    audience: list[str] = Field(default_factory=list, max_length=10)
    run_kind: str = Field(default="pre_review", max_length=40)
    dimensions: list[dict] = Field(default_factory=list, max_length=64)
    version: str = Field(default="1.0.0", max_length=70)


class OutcomeInput(Input):
    """T10 会议结果。原始结果码必填；未提供时不得推断成通过或否决。"""

    raw_code: str = Field(min_length=1, max_length=100)
    meeting_id: str = Field(min_length=1, max_length=ID_MAX)
    normalized: str | None = Field(default=None, max_length=40)
    occurred_at: str | None = None
    reviewed_snapshot_id: str | None = Field(default=None, max_length=ID_MAX)
    supersedes_id: str | None = Field(default=None, max_length=ID_MAX)
    mapping_ref: dict | None = None
    conditions: list[str] = Field(default_factory=list, max_length=50)
    evidence_ids: list[str] = Field(default_factory=list, max_length=EVIDENCE_MAX)


# ---------------------------------------------------------------- 错误信封
def _envelope(request: Request, code: ErrorCode, message: str) -> JSONResponse:
    request_id = request.headers.get("x-request-id") or store.uid("req")
    return JSONResponse(
        status_code=S1_ERROR_HTTP[code],
        content={"error": {"code": code.value, "message": message,
                           "retryable": S1_ERROR_RETRYABLE[code],
                           "request_id": request_id}},
    )


def scope(request: Request, project_id: str):
    """项目范围检查。通过返回 None；不通过返回 404/403 信封。

    无权访问的项目按 404 处理（03 §2 不泄露对象存在性）；演示域被禁用是策略性
    拒绝，按 403（E-03）。
    """
    try:
        check_project(request, project_id)
    except HTTPException:
        return _envelope(request, ErrorCode.NOT_FOUND, NOT_FOUND_MESSAGE)
    if project_id in DEMO_PROJECTS and not flags()["demo"]:
        return _envelope(request, ErrorCode.ACCESS_DENIED, "演示数据域已禁用")
    return None


def run(request: Request, call, invalid_code: ErrorCode = ErrorCode.INVALID_REQUEST):
    """执行并把异常映射为统一信封。

    顺序重要：HTTPException 必须原样抛出，否则依赖注入阶段的 401/403 会被吞掉。
    """
    try:
        return call()
    except HTTPException:
        raise
    except FactConflictUnresolved as exc:
        # E-17 的「确认动作被拒」面；运行级结果面是 HTTP 200 且不走此信封
        return _envelope(request, ErrorCode.FACT_CONFLICT_UNRESOLVED, str(exc))
    except store.IdempotencyConflict as exc:
        return _envelope(request, ErrorCode.IDEMPOTENCY_CONFLICT, str(exc))
    except store.Conflict as exc:
        return _envelope(request, ErrorCode.REVISION_CONFLICT, str(exc))
    except PermissionError as exc:
        return _envelope(request, ErrorCode.ACCESS_DENIED, str(exc))
    except KeyError:
        return _envelope(request, ErrorCode.NOT_FOUND, NOT_FOUND_MESSAGE)
    except ValueError as exc:
        return _envelope(request, invalid_code, str(exc))


# ---------------------------------------------------------------- 内部工具
def _service() -> ProjectAssistantService:
    return ProjectAssistantService()


def _db():
    return _service().connect()


def _project(db, project_id: str) -> dict:
    project = store.get(db, "project", project_id)  # 不存在 → KeyError → 404
    if project.get("data_domain") not in ("demo", "production"):
        raise ValueError("项目数据域异常，无法导入材料")
    return project


def _actor(request: Request) -> str:
    return request.state.identity["id"]


def _key(request: Request) -> str:
    key = request.headers.get("idempotency-key", "")
    if len(key) > 160:
        raise ValueError("幂等键过长")
    return key


def _limit(value: int) -> int:
    return max(1, min(value, 100))


# ------------------------------------------------- 既有上传入口的批量摄取
def _pick_item(batch: dict, filename: str, item_id: str | None) -> dict:
    items = batch["items"]
    if item_id:
        item = next((i for i in items if i["id"] == item_id), None)
        if item is None:
            raise KeyError("导入条目不存在")
        return item
    base = filename.replace("\\", "/").rsplit("/", 1)[-1]
    matches = [i for i in items
               if i["relative_path"].replace("\\", "/").rsplit("/", 1)[-1] == base]
    if not matches:
        raise KeyError("该文件不在导入批次清单中")
    if len(matches) > 1:
        raise ValueError("批次中有多个同名文件，请指定 item_id")
    return matches[0]


def ingest_into_batch(project_id: str, filename: str, content: bytes, actor: str,
                      batch_id: str, item_id: str | None = None):
    """把文件字节摄入**既有**上传链，并回写批次条目（T00/04 §4.2）。

    不建立平行上传 API：仍走 `ProjectAssistantService.upload()`，因此解析、
    去重（同哈希复用原件）、pending_candidates、data_revision、mark_stale 等
    既有行为完全不变。本函数只做"清单核对 + 状态回写"。

    服务端**重算**哈希与大小，不信任客户端清单（B-22 的来源可信度）。
    """
    with _db() as db:
        batch = material_import.load(db, batch_id, project_id)
    if batch["status"] == "cancelled":
        raise store.Conflict("批次已取消，不能继续摄入文件")

    item = _pick_item(batch, filename, item_id)

    def fail(code: ErrorCode, message: str):
        with _db() as db:
            db.execute("BEGIN IMMEDIATE")
            material_import.mark_item(db, batch_id, item["id"], "failed", error_code=code)
        raise ValueError(message)

    if item["status"] == "parsed":
        raise store.Conflict("该条目已解析完成，不能重复摄入")
    digest = hashlib.sha256(content).hexdigest()
    if digest != item["sha256"]:
        fail(ErrorCode.INVALID_EVIDENCE, "文件内容与清单声明的 sha256 不一致，请重新选择该文件")
    if len(content) != item["size_bytes"]:
        fail(ErrorCode.INVALID_EVIDENCE, "文件大小与清单声明不一致，请重新选择该文件")

    # 走既有上传链（可能因同哈希而复用既有 document，这是 14 §3 的期望行为）
    document = _service().upload(project_id, filename, content, actor)

    with _db() as db:
        db.execute("BEGIN IMMEDIATE")
        batch = material_import.mark_item(db, batch_id, item["id"], "parsed",
                                          document_id=document["id"])
    # 返回体保持**document 形状**（既有调用方读 id 与 candidates），
    # 批次状态作为附加字段给出，不替换既有契约。
    return dict(document, import_batch=batch)


async def validation_handler(request: Request, exc: RequestValidationError):
    """请求体/查询参数校验失败也走统一信封。

    为什么需要它：`Input(extra="forbid")` 之类由 FastAPI 的校验层在**进入端点之前**
    抛错，不经过本模块的 `run()`，若不处理就会在同一命名空间里出现两种错误形状
    （信封 + FastAPI 默认的 `{"detail": ...}`）。这是 smoke_s1.py 实测发现的。

    **非 prescreen 路径一律交回 FastAPI 默认处理器**，因此既有端点的错误形状
    完全不变（有测试锁定这一隔离）。
    """
    if not request.url.path.startswith(router.prefix):
        return await request_validation_exception_handler(request, exc)
    errors = exc.errors() if callable(exc.errors) else exc.errors
    first = errors[0] if errors else {}
    where = ".".join(str(part) for part in first.get("loc", ()) if part != "body") or "请求"
    return _envelope(request, ErrorCode.INVALID_REQUEST,
                     f"{where}：{first.get('msg', '校验失败')}")


# ---------------------------------------------------------------- 导入批次
@router.post("/projects/{project_id}/import-batches", status_code=202)
def create_import_batch(project_id: str, payload: ImportBatchInput, request: Request):
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            db.execute("BEGIN IMMEDIATE")
            project = _project(db, project_id)
            batch = material_import.create(db, project_id, project["data_domain"],
                                           payload.manifest, _actor(request), _key(request))
        return {"batch": batch}

    return run(request, action, ErrorCode.IMPORT_BATCH_INVALID)


@router.get("/projects/{project_id}/import-batches")
def list_import_batches(project_id: str, request: Request, limit: int = 20):
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            return material_import.listing(db, project_id, _limit(limit))

    return run(request, action)


@router.get("/import-batches/{batch_id}")
def get_import_batch(batch_id: str, request: Request):
    def action():
        with _db() as db:
            batch = material_import.load(db, batch_id)  # KeyError → 404
        blocked = scope(request, batch["project_id"])
        return blocked if blocked is not None else batch

    return run(request, action)


@router.post("/import-batches/{batch_id}/retry", status_code=202)
def retry_import_batch(batch_id: str, payload: RetryInput, request: Request):
    def action():
        with _db() as db:
            probe = material_import.load(db, batch_id)
        blocked = scope(request, probe["project_id"])
        if blocked is not None:
            return blocked
        with _db() as db:
            db.execute("BEGIN IMMEDIATE")
            return material_import.retry(db, batch_id, payload.item_ids,
                                         _actor(request), payload.expected_revision)

    return run(request, action, ErrorCode.IMPORT_BATCH_INVALID)


@router.post("/import-batches/{batch_id}/cancel")
def cancel_import_batch(batch_id: str, payload: CancelInput, request: Request):
    def action():
        with _db() as db:
            probe = material_import.load(db, batch_id)
        blocked = scope(request, probe["project_id"])
        if blocked is not None:
            return blocked
        with _db() as db:
            db.execute("BEGIN IMMEDIATE")
            return material_import.cancel(db, batch_id, _actor(request), payload.expected_revision)

    return run(request, action, ErrorCode.IMPORT_BATCH_INVALID)


# ---------------------------------------------------------------- 事实冲突
@router.get("/projects/{project_id}/fact-conflicts")
def list_fact_conflicts(project_id: str, request: Request, status: str | None = None,
                        limit: int = 20):
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked
    if status not in (None, "unresolved", "resolved"):
        return _envelope(request, ErrorCode.INVALID_REQUEST,
                         "状态取值须为 unresolved 或 resolved")

    def action():
        with _db() as db:
            return fact_conflict.listing(db, project_id, status, _limit(limit))

    return run(request, action)


@router.get("/fact-conflicts/{conflict_id}")
def get_fact_conflict(conflict_id: str, request: Request):
    def action():
        with _db() as db:
            row = fact_conflict.load(db, conflict_id)
        blocked = scope(request, row["project_id"])
        return blocked if blocked is not None else row

    return run(request, action)


@router.post("/fact-conflicts/{conflict_id}/resolve")
def resolve_fact_conflict(conflict_id: str, payload: ResolveInput, request: Request):
    def action():
        with _db() as db:
            probe = fact_conflict.load(db, conflict_id)
        blocked = scope(request, probe["project_id"])
        if blocked is not None:
            return blocked
        with _db() as db:
            db.execute("BEGIN IMMEDIATE")
            project = _project(db, probe["project_id"])
            # resolve 就地写 project 的 values/selected_sources/facts，因此必须保存它；
            # 不要在此重复计算 facts 的列名——resolve 已按 FIELDS 反查过。
            resolved = fact_conflict.resolve(db, conflict_id, project,
                                             payload.selected_evidence_ids,
                                             payload.resolution_note,
                                             _actor(request), payload.expected_revision)
            store.put(db, "project", project)
        return resolved

    return run(request, action)


# ---------------------------------------------------------------- 运行视图（T09）
@router.get("/projects/{project_id}/runs")
def list_runs(project_id: str, request: Request, limit: int = 20):
    """项目内已装配的预审运行视图列表；没有运行就返回空列表，不造空壳。"""
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            items = prescreen_store.listing(db, project_id, _limit(limit))
        return {"items": items}

    return run(request, action)


@router.get("/projects/{project_id}/runs/{run_id}")
def get_run(project_id: str, run_id: str, request: Request):
    """只读运行视图。没有运行就是 404，不返回一个空壳运行充数。"""
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            return prescreen_store.load(db, project_id, run_id)

    return run(request, action)


@router.get("/projects/{project_id}/runs/{run_id}/assumptions")
def list_assumptions(project_id: str, run_id: str, request: Request):
    """本次方案可用的假设动作。只返回指向该运行真实存在维度的动作（E-22）。"""
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            view = prescreen_store.load(db, project_id, run_id)
        return {"items": prescreen_sandbox.available_assumptions(view),
                "scenario_table_version": prescreen_sandbox.DEMO_TABLE_VERSION,
                "label": prescreen_sandbox.DEMO_LABEL}

    return run(request, action)


@router.post("/projects/{project_id}/runs/{run_id}/simulations", status_code=201)
def create_simulation(project_id: str, run_id: str, payload: SimulationInput,
                      request: Request):
    """按完整假设组合产出一条情景；真实运行只被读取（BR-11 / AC-11）。

    演示值只在 demo 域返回（E-21）；假设冲突或指向不存在的维度按 E-22 拒绝。
    请求体里没有任何概率字段——数值一律由服务端查表给出。
    """
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            view = prescreen_store.load(db, project_id, run_id)
        if payload.expected_revision is not None \
                and view.get("revision") != payload.expected_revision:
            raise store.Conflict("运行已有新版本，请刷新后重试")
        try:
            result = prescreen_sandbox.simulate(view, payload.assumptions)
        except prescreen_sandbox.DemoEstimateForbidden as exc:
            return _envelope(request, ErrorCode.DEMO_ESTIMATE_FORBIDDEN, str(exc))
        except prescreen_sandbox.AssumptionConflict as exc:
            return _envelope(request, ErrorCode.SCENARIO_ASSUMPTION_CONFLICT, str(exc))
        prescreen_sandbox.assert_baseline_untouched(view, result)
        return result

    return run(request, action)


# ---------------------------------------------------------------- 轨迹与会议结果（T10）
@router.get("/projects/{project_id}/runs/{run_id}/trajectory")
def get_trajectory(project_id: str, run_id: str, request: Request,
                   cursor: str | None = None, limit: int = 50):
    """只读轨迹回放。失败的步骤照常返回，不做美化过滤。"""
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            return trajectory.replay(db, project_id, run_id, cursor, _limit(limit))

    return run(request, action)


@router.get("/projects/{project_id}/review-outcomes")
def list_review_outcomes(project_id: str, request: Request, status: str | None = None):
    """会议结果列表。unmatched 单列，不混进已观察通过率的分母。"""
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked
    if status not in (None, "matched", "unmatched"):
        return _envelope(request, ErrorCode.INVALID_REQUEST,
                         "状态取值须为 matched 或 unmatched")

    def action():
        with _db() as db:
            return trajectory.listing(db, project_id, status)

    return run(request, action)


@router.post("/projects/{project_id}/review-outcomes", status_code=201)
def record_review_outcome(project_id: str, payload: OutcomeInput, request: Request):
    """追加会议结果。找不到材料版本的一律记 unmatched；更正只能新增。"""
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            runs = store.listing(db, "run", project_id)
            snapshots = [item.get("input_snapshot_id") for item in runs
                         if item.get("input_snapshot_id")]
            return trajectory.record(db, project_id, payload.model_dump(), _actor(request),
                                     known_snapshots=snapshots)

    return run(request, action)


# ---------------------------------------------------------------- 改进治理（T11）
@router.get("/projects/{project_id}/improvements")
def list_improvements(project_id: str, request: Request, status: str | None = None):
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            return improvements.listing(db, project_id, status)

    return run(request, action)


@router.post("/projects/{project_id}/improvements", status_code=201)
def propose_improvement(project_id: str, payload: ImprovementInput, request: Request):
    """提出改进候选（草稿）。发布仍须经过对照、独立审核两个门。"""
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            project = _project(db, project_id)
            return improvements.propose(db, project_id, payload.model_dump(),
                                        _actor(request), project["data_domain"])

    return run(request, action)


def _revision_draft(db, ref: dict) -> dict:
    """把候选声明的 `proposed_revision_ref` 解析成**那一份**草稿。

    坚持按 `组件id@版本` 精确定位：只按组件 id 取"当前草稿"会解析到另一个修订
    （`revise()` 升版本后旧草稿仍在），于是出现"审核的是 A、发布的是 B"。
    解析不到就报未完成，**不退回猜一个草稿**。
    """
    ref = ref or {}
    component_id = str(ref.get("id") or "").strip()
    version = str(ref.get("version") or "").strip()
    if not component_id or not version:
        raise improvements.NotValidated("候选必须声明要发布的组件版本（proposed_revision_ref）")
    draft_id = component_id if "@" in component_id else f"{component_id}@{version}"
    try:
        return knowledge_cards.current_draft(db, draft_id)
    except KeyError as exc:
        raise improvements.NotValidated(
            f"候选指向的草稿 {draft_id} 不存在；请先形成草稿修订再发布") from exc


def _knowledge_publisher(db, actor: str, preview: bool):
    """把改进候选的发布接到**真实知识发布入口**（BR-51 / AC-57）。

    走 `knowledge_cards.publish` → `component_registry.release`，因此"自批拒绝、
    隔离评测门禁、依赖可解析"三道既有保证原样生效，发布成功才覆盖 `release` 指针、
    后续运行由 `freeze() → resolve()` 取到新版本。候选只是**指向**这次真实发布。

    `db` 必须是调用方同一个连接：另开连接会让"写组件版本"与"写候选状态"分裂成
    两个事务，出现"版本已发布、候选没标记"的裂口。
    publisher 抛异常时 `improvements.transition` 不写候选状态（发布失败保留旧版）。
    """
    def publish(candidate: dict) -> dict:
        if candidate.get("target") != "knowledge":
            raise improvements.NotValidated(
                f"target={candidate.get('target')} 尚无真实发布入口；不得用改状态冒充发布")
        draft = _revision_draft(db, candidate.get("proposed_revision_ref"))
        try:
            published = knowledge_cards.publish(db, draft["id"], actor, preview)
        except store.Conflict as exc:
            # 评测/依赖门禁未过：统一按"未完成门禁"回报，界面只需处理一个码（E-24）
            raise improvements.NotValidated(str(exc)) from exc
        return {"id": published["component_id"], "version": published["version"]}

    return publish


@router.post("/improvements/{candidate_id}/transitions")
def transition_improvement(candidate_id: str, payload: TransitionInput, request: Request):
    """候选状态机。泄漏按 E-11 拒绝，未通过对照/审核按 E-24 拒绝。

    `release` **不接受调用方自报的版本号**：版本由服务端调用真实知识发布入口产生
    （BR-51 / AC-57）。只改 `released` 状态或返回一个版本号都不算发布，因此带了
    `released_ref` 的请求一律 422 拒绝，而不是静默忽略它。
    """
    def action():
        if payload.released_ref is not None:
            raise ValueError("发布版本由服务端实际发布产生，不接受客户端提交的 released_ref")
        with _db() as db:
            probe = store.get(db, improvements.KIND, candidate_id)
            blocked = scope(request, probe["project_id"])
            if blocked is not None:
                return blocked
            try:
                return improvements.transition(
                    db, candidate_id, payload.action, _actor(request),
                    payload.expected_revision, evaluation=payload.evaluation,
                    contrast=payload.contrast, reason=payload.reason,
                    publisher=_knowledge_publisher(
                        db, _actor(request),
                        request.state.identity.get("preview", False)))
            except improvements.LeakageDetected as exc:
                return _envelope(request, ErrorCode.EVALUATION_CONTAMINATED, str(exc))
            except improvements.NotValidated as exc:
                return _envelope(request, ErrorCode.IMPROVEMENT_NOT_VALIDATED, str(exc))

    return run(request, action)


# ---------------------------------------------------------------- 历史经验加工（纠偏第二批）
@router.get("/projects/{project_id}/case-timeline")
def get_case_timeline(project_id: str, request: Request):
    """历史过程时间线。尚未提炼过就是 404，不返回空壳时间线充数。"""
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            return history_cases.load(db, project_id)

    return run(request, action)


@router.post("/projects/{project_id}/case-timeline", status_code=201)
def rebuild_case_timeline(project_id: str, request: Request):
    """从项目材料重新提炼时间线（确定性、不调用模型）。

    重复提炼是同一对象的新 revision（03 §4），不是新建时间线。
    """
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            project = _project(db, project_id)
            return history_cases.build(db, project_id, project["data_domain"])

    return run(request, action)


@router.get("/projects/{project_id}/knowledge-extractions")
def list_knowledge_extractions(project_id: str, request: Request):
    """提炼记录列表。失败的记录照常返回——未完成必须可见，不隐藏。"""
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            return {"items": experience_extraction.listing(db, project_id)}

    return run(request, action)


@router.post("/projects/{project_id}/knowledge-extractions", status_code=201)
def create_knowledge_extraction(project_id: str, payload: ExtractionInput, request: Request):
    """发起一次真实提炼（BR-48 / AC-50）。

    **模型不可用不是 HTTP 错误**：仍返回 201 与一条 `status=failed` 的记录，
    其 degradations 带 E-28，且 `candidate_id` 为空（"不产生候选"由契约强制）。
    这与 E-27 的口径一致——"HTTP 2xx 只表示记录可读取，不表示提炼成功"。
    """
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            timeline = history_cases.load(db, project_id)
            return experience_extraction.extract(db, project_id, timeline, payload.model_dump(),
                                                 _actor(request))

    return run(request, action)


@router.get("/projects/{project_id}/knowledge-extractions/{extraction_id}")
def get_knowledge_extraction(project_id: str, extraction_id: str, request: Request):
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            return experience_extraction.load(db, project_id, extraction_id)

    return run(request, action)


# ---------------------------------------------------------------- 候选治理（纠偏第二批 B-b）
# 注意：按卡片/方案 id 的路由**必须**在 run() 内查归属再判权限——放到路由函数体里，
# 对象不存在时的 KeyError 会绕过 run() 的映射变成 500，而不是既有的 404 口径。

@router.get("/projects/{project_id}/knowledge-candidates")
def list_knowledge_candidates(project_id: str, request: Request):
    """项目知识卡片（草稿与已发布）。来源与状态原样返回，供界面区分历史提炼与人工创建。"""
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            return {"items": knowledge_cards.list_cards(db, project_id)}

    return run(request, action)


@router.post("/projects/{project_id}/knowledge-candidates", status_code=201)
def propose_knowledge_candidate(project_id: str, payload: CandidateInput, request: Request):
    """人工新增候选草稿。数据域取自项目，**不接受调用方自报**（避免跨域卡片）。"""
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            project = _project(db, project_id)
            # 组件 id 由服务端生成：调用方不该靠自报 id 影响治理（03 §9.4 同口径）
            body = dict(payload.content, kind=payload.kind, name=payload.title,
                        id=store.uid(payload.kind + ".card"), version=payload.version,
                        scope=project["data_domain"])
            if payload.expires_at:
                body["expires_at"] = payload.expires_at
            return knowledge_cards.propose(
                db, body, _actor(request), project_id, origin=payload.origin,
                source_event_ids=payload.source_event_ids,
                source_evidence_ids=payload.source_evidence_ids,
                card_scope=payload.card_scope, team_id=payload.team_id)

    return run(request, action)


@router.patch("/knowledge-candidates/{card_id}")
def revise_knowledge_candidate(card_id: str, payload: ReviseInput, request: Request):
    """形成草稿修订。**不发布、不自批**——发布走 transitions 且需独立审核人。

    模型调用在数据库连接之外进行：一次自然语言解释可能耗时数十秒，
    不该占着 SQLite 连接。
    """
    def action():
        with _db() as db:
            draft = knowledge_cards.current_draft(db, card_id)
            card = knowledge_cards.draft_card(db, draft["id"])
        blocked = scope(request, draft["project_id"])
        if blocked is not None:
            return blocked
        # 模型调用放在数据库连接之外：自然语言解释可能耗时数十秒，不该占着 SQLite 连接
        changes, note = experience_extraction.edit_changes(card, payload.model_dump())
        with _db() as db:
            return knowledge_cards.revise(db, card_id, changes, _actor(request), note,
                                          expected_revision=payload.expected_revision)

    return run(request, action)


@router.post("/knowledge-candidates/{card_id}/transitions")
def transition_knowledge_candidate(card_id: str, payload: TransitionInput, request: Request):
    """候选状态机。评测门禁与"不自批"由 `registry.release()` 保证（AC-03 / AC-43）。

    本版只实现 evaluate 与 publish：注册表只产出 draft/published 两种状态，
    `in_review`/`rejected`/`withdrawn` 尚无落地表达——这是既有缺口，
    不在这里用一个假状态掩盖。
    """
    def action():
        if not flags()["evaluation"]:
            raise HTTPException(503, "候选评测与发布已暂停")
        with _db() as db:
            draft = knowledge_cards.current_draft(db, card_id)
        blocked = scope(request, draft["project_id"])
        if blocked is not None:
            return blocked
        if payload.action == "evaluate":
            # 角色门禁与既有 /components/{id}/actions 一致：新路由不得比既有入口宽松
            role(request, ("admin", "reviewer"))
            from services.component_evaluation import evaluate
            with _db() as db:
                return evaluate(db, draft["id"], _actor(request))
        if payload.action == "publish":
            role(request, ("admin", "reviewer"))
            with _db() as db:
                return knowledge_cards.publish(db, draft["id"], _actor(request),
                                               request.state.identity.get("preview", False))
        raise ValueError(f"不支持的候选动作：{payload.action}；本版支持 evaluate 与 publish")

    return run(request, action)


# ---------------------------------------------------------------- 方案装配（纠偏第二批 B-c）


@router.get("/projects/{project_id}/review-plans")
def list_review_plans(project_id: str, request: Request):
    """项目自建的方案草稿与已发布版本。内置种子方案是全局配置，不在此列。"""
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            project = _project(db, project_id)
            return {"items": review_plan.list_plans(db, project_id, project["data_domain"])}

    return run(request, action)


@router.post("/projects/{project_id}/review-plans", status_code=201)
def propose_review_plan(project_id: str, payload: ReviewPlanInput, request: Request):
    """装配一份方案草稿。

    这是"已发布卡片被选入方案"的入口：`skills`/`rules` 里填卡片组件 id 即可，
    但草稿或已撤回的组件会在装配与发布两处被拒（BR-27 / AC-28）。
    """
    blocked = scope(request, project_id)
    if blocked is not None:
        return blocked

    def action():
        with _db() as db:
            project = _project(db, project_id)
            body = dict(payload.model_dump(), kind="plan", scope=project["data_domain"],
                        id=store.uid("plan.card"))
            return review_plan.propose_plan(db, body, _actor(request), project_id)

    return run(request, action)


@router.post("/review-plans/{plan_ref}/transitions")
def transition_review_plan(plan_ref: str, payload: TransitionInput, request: Request):
    """方案评测与发布。角色门禁与既有 `/components` 入口一致。"""
    def action():
        if not flags()["evaluation"]:
            raise HTTPException(503, "方案评测与发布已暂停")
        with _db() as db:
            draft = registry.current_draft(db, plan_ref)
        blocked = scope(request, draft["project_id"])
        if blocked is not None:
            return blocked
        if payload.action == "evaluate":
            role(request, ("admin", "reviewer"))
            from services.component_evaluation import evaluate
            with _db() as db:
                return evaluate(db, draft["id"], _actor(request))
        if payload.action == "publish":
            role(request, ("admin", "reviewer"))
            with _db() as db:
                return registry.release(db, draft["id"], _actor(request),
                                        request.state.identity.get("preview", False))
        raise ValueError(f"不支持的方案动作：{payload.action}；本版支持 evaluate 与 publish")

    return run(request, action)


@router.get('/projects/{project_id}/run-comparison')
def compare_runs(project_id: str, left: str, right: str, request: Request):
    blocked=scope(request, project_id)
    if blocked is not None:
        return blocked
    def action():
        from services.trajectory_details import compare
        with _db() as db:
            return compare(db, project_id, left, right)
    return run(request, action)