"""AccessRule 子域 Router。

外部系统限界上下文的工具访问控制规则管理 API，覆盖访问规则 CRUD。
所有端点通过 ``create_use_cases_from_db`` 装配 use_cases，经
``access_rule_service`` 端口调用用例。

Request Schema 与 Input DTO 不共享类，Router 内显式构造 DTO，操作人字段
（``created_by`` / ``updated_by``）由 ``current_user.uid`` 填充。
"""

from __future__ import annotations

from datetime import datetime
from typing import Any, Literal

from fastapi import APIRouter, Depends, Query
from pydantic import BaseModel, ConfigDict, Field
from sqlalchemy.ext.asyncio import AsyncSession
from yuxi.external_systems.infrastructure.container import create_use_cases_from_db
from yuxi.external_systems.use_cases.dto.access_rule import (
    BatchCloneAccessRulesInput,
    BatchToggleAccessRulesInput,
    CreateAccessRuleInput,
    DeleteAccessRuleInput,
    EvaluateAccessInput,
    GetAccessRuleInput,
    GetConditionsInput,
    ListAccessRulesInput,
    ReorderAccessRulesInput,
    SimulateAccessInput,
    UpdateAccessRuleInput,
    UpdateConditionsInput,
)
from yuxi.storage.postgres.models_business import User

from server.utils.auth_middleware import get_admin_user, get_db, get_required_user

access_rule_router = APIRouter(prefix="/access-rules", tags=["external-systems-access-rule"])


# ---------------- Request Schemas ----------------


class CreateAccessRuleRequest(BaseModel):
    """创建访问规则请求体。字段对齐 ``CreateAccessRuleInput``（不含 created_by）。

    ``created_by`` 由 Router 从 ``current_user.uid`` 注入。字段长度约束对齐
    ``ExternalToolAccessRule`` ORM 列定义，在边界层拦截非法输入。
    """

    model_config = ConfigDict(frozen=True)

    principal_type: str = Field(..., min_length=1, max_length=32)
    principal_id: str = Field(..., min_length=1, max_length=64)
    tool_slug: str | None = Field(default=None, max_length=128)
    system_id: int | None = None
    principal_name: str | None = Field(default=None, max_length=128)
    env_key: str | None = Field(default=None, max_length=32)
    effect: Literal["allow", "deny"] = "allow"
    priority: int = 0
    conditions: dict[str, Any] = Field(default_factory=dict)
    expires_at: datetime | None = None
    enabled: bool = True
    description: str | None = None


class UpdateAccessRuleRequest(BaseModel):
    """更新访问规则请求体。字段对齐 ``UpdateAccessRuleInput``（不含 id 与 updated_by）。

    ``id`` 由路径参数提供，``updated_by`` 由 Router 从 ``current_user.uid`` 注入。
    所有字段均为可选，仅透传客户端显式设置的字段。字符串字段长度约束对齐
    ``ExternalToolAccessRule`` ORM 列定义。
    """

    model_config = ConfigDict(frozen=True)

    principal_name: str | None = Field(default=None, max_length=128)
    effect: Literal["allow", "deny"] | None = None
    priority: int | None = None
    conditions: dict[str, Any] | None = None
    expires_at: datetime | None = None
    enabled: bool | None = None
    description: str | None = None


# ---------------- 扩展 Request Schemas ----------------


class EvaluateAccessRequest(BaseModel):
    """评估访问规则请求体。字段对齐 EvaluateAccessInput（不含操作人字段）。"""

    model_config = ConfigDict(frozen=True)

    principal_type: str = Field(..., min_length=1, max_length=32)
    principal_id: str = Field(..., min_length=1, max_length=64)
    tool_slug: str | None = Field(default=None, max_length=128)
    system_id: int | None = None
    env_key: str | None = Field(default=None, max_length=32)


class SimulateAccessRequest(BaseModel):
    """模拟规则执行请求体。字段对齐 SimulateAccessInput（不含操作人字段）。"""

    model_config = ConfigDict(frozen=True)

    principal_type: str = Field(..., min_length=1, max_length=32)
    principal_id: str = Field(..., min_length=1, max_length=64)
    tool_slug: str | None = Field(default=None, max_length=128)
    system_id: int | None = None
    env_key: str | None = Field(default=None, max_length=32)


class BatchToggleAccessRulesRequest(BaseModel):
    """批量启停访问规则请求体。"""

    model_config = ConfigDict(frozen=True)

    rule_ids: list[int] = Field(min_length=1)
    enabled: bool


class ReorderItem(BaseModel):
    """单条规则优先级调整项。"""

    model_config = ConfigDict(frozen=True)

    rule_id: int
    priority: int


class ReorderAccessRulesRequest(BaseModel):
    """批量调整规则优先级请求体。"""

    model_config = ConfigDict(frozen=True)

    orders: list[ReorderItem] = Field(min_length=1)


class UpdateConditionsRequest(BaseModel):
    """更新规则条件请求体。"""

    model_config = ConfigDict(frozen=True)

    conditions: dict[str, Any]


class BatchCloneAccessRulesRequest(BaseModel):
    """批量克隆访问规则请求体。"""

    model_config = ConfigDict(frozen=True)

    source_rule_ids: list[int] = Field(min_length=1)
    override_config: dict[str, Any] = Field(default_factory=dict)


# ---------------- Endpoints ----------------


@access_rule_router.get("", response_model=dict)
async def list_access_rules(
    limit: int = Query(100, ge=1, le=500),
    offset: int = Query(0, ge=0),
    system_id: int | None = Query(None),
    tool_slug: str | None = Query(None),
    principal_type: str | None = Query(None),
    principal_id: str | None = Query(None),
    env_key: str | None = Query(None),
    effect: str | None = Query(None),
    enabled: bool | None = Query(None),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """分页列出工具访问控制规则。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = ListAccessRulesInput(
        page=offset // limit + 1,
        page_size=limit,
        system_id=system_id,
        tool_slug=tool_slug,
        principal_type=principal_type,
        principal_id=principal_id,
        env_key=env_key,
        effect=effect,
        enabled=enabled,
    )
    output = await use_cases.access_rule_service.list_access_rules(input_dto)
    return {"success": True, "data": output.model_dump()}


# ---------------- 静态路径扩展端点（必须在 /{rule_id} 之前声明）----------------


@access_rule_router.post("/evaluate", response_model=dict)
async def evaluate_access(
    payload: EvaluateAccessRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """评估访问规则（只读查询，不抛异常）。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = EvaluateAccessInput(
        principal_type=payload.principal_type,
        principal_id=payload.principal_id,
        tool_slug=payload.tool_slug,
        system_id=payload.system_id,
        env_key=payload.env_key,
    )
    output = await use_cases.access_rule_service.evaluate_access(input_dto)
    return {"success": True, "data": output.model_dump()}


@access_rule_router.post("/simulate", response_model=dict)
async def simulate_access(
    payload: SimulateAccessRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """模拟规则执行（只读查询，返回每条规则的评估详情）。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = SimulateAccessInput(
        principal_type=payload.principal_type,
        principal_id=payload.principal_id,
        tool_slug=payload.tool_slug,
        system_id=payload.system_id,
        env_key=payload.env_key,
    )
    output = await use_cases.access_rule_service.simulate_access(input_dto)
    return {"success": True, "data": output.model_dump()}


@access_rule_router.post("/batch-toggle", response_model=dict)
async def batch_toggle_access_rules(
    payload: BatchToggleAccessRulesRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """批量启停访问规则。``updated_by`` 由当前管理员填充。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = BatchToggleAccessRulesInput(
        rule_ids=payload.rule_ids,
        enabled=payload.enabled,
        updated_by=current_user.uid,
    )
    output = await use_cases.access_rule_service.batch_toggle_access_rules(input_dto)
    return {"success": True, "data": output.model_dump()}


@access_rule_router.put("/reorder", response_model=dict)
async def reorder_access_rules(
    payload: ReorderAccessRulesRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """批量调整规则优先级。``updated_by`` 由当前管理员填充。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = ReorderAccessRulesInput(
        orders=[item.model_dump() for item in payload.orders],
        updated_by=current_user.uid,
    )
    output = await use_cases.access_rule_service.reorder_access_rules(input_dto)
    return {"success": True, "data": output.model_dump()}


@access_rule_router.post("/batch-clone", response_model=dict)
async def batch_clone_access_rules(
    payload: BatchCloneAccessRulesRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """批量克隆访问规则。``created_by`` 由当前管理员填充。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = BatchCloneAccessRulesInput(
        source_rule_ids=payload.source_rule_ids,
        override_config=payload.override_config,
        created_by=current_user.uid,
    )
    output = await use_cases.access_rule_service.batch_clone_access_rules(input_dto)
    return {"success": True, "data": output.model_dump()}


@access_rule_router.get("/{rule_id}", response_model=dict)
async def get_access_rule(
    rule_id: int,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """获取访问规则详情。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = GetAccessRuleInput(id=rule_id)
    output = await use_cases.access_rule_service.get_access_rule(input_dto)
    return {"success": True, "data": output.model_dump()}


@access_rule_router.post("", response_model=dict)
async def create_access_rule(
    payload: CreateAccessRuleRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """创建工具访问控制规则。``created_by`` 由当前管理员填充。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = CreateAccessRuleInput(
        **payload.model_dump(),
        created_by=current_user.uid,
    )
    output = await use_cases.access_rule_service.create_access_rule(input_dto)
    return {"success": True, "data": output.model_dump()}


@access_rule_router.put("/{rule_id}", response_model=dict)
async def update_access_rule(
    rule_id: int,
    payload: UpdateAccessRuleRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """更新工具访问控制规则。``updated_by`` 由当前管理员填充。仅透传显式设置的字段。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = UpdateAccessRuleInput(
        id=rule_id,
        updated_by=current_user.uid,
        **payload.model_dump(exclude_unset=True),
    )
    output = await use_cases.access_rule_service.update_access_rule(input_dto)
    return {"success": True, "data": output.model_dump()}


@access_rule_router.delete("/{rule_id}", response_model=dict)
async def delete_access_rule(
    rule_id: int,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """删除工具访问控制规则。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = DeleteAccessRuleInput(id=rule_id)
    output = await use_cases.access_rule_service.delete_access_rule(input_dto)
    return {"success": True, "data": output.model_dump()}


# ---------------- 动态路径扩展端点（/{rule_id}/conditions）----------------


@access_rule_router.get("/{rule_id}/conditions", response_model=dict)
async def get_conditions(
    rule_id: int,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """查询访问规则的附加条件。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = GetConditionsInput(rule_id=rule_id)
    output = await use_cases.access_rule_service.get_conditions(input_dto)
    return {"success": True, "data": output.model_dump()}


@access_rule_router.put("/{rule_id}/conditions", response_model=dict)
async def update_conditions(
    rule_id: int,
    payload: UpdateConditionsRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """更新访问规则的附加条件。``updated_by`` 由当前管理员填充。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = UpdateConditionsInput(
        rule_id=rule_id,
        conditions=payload.conditions,
        updated_by=current_user.uid,
    )
    output = await use_cases.access_rule_service.update_conditions(input_dto)
    return {"success": True, "data": output.model_dump()}