"""TestCase 子域 Router。

外部系统限界上下文的工具回归测试用例管理 API，覆盖测试用例 CRUD、执行管理、
克隆、导入导出、告警配置管理。所有端点通过 ``create_use_cases_from_db`` 装配
use_cases，经 ``test_case_service`` 端口调用用例。

Request Schema 与 Input DTO 不共享类，Router 内显式构造 DTO，操作人字段由
current_user.uid 填充。
"""

from __future__ import annotations

import json
from datetime import UTC, datetime
from typing import Any

from fastapi import APIRouter, Body, Depends, Path, Query
from fastapi.responses import StreamingResponse
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.test_case import (
    BatchCloneTestCasesInput,
    BatchExecuteTestCasesInput,
    CloneTestCaseInput,
    CreateTestCaseInput,
    DeleteTestCaseInput,
    ExportTestCasesInput,
    GetAlertConfigInput,
    GetTestCaseInput,
    ImportTestCasesInput,
    ListTestCasesInput,
    RunTestCaseInput,
    UpdateAlertConfigInput,
    UpdateTestCaseInput,
)
from yuxi.storage.postgres.models_business import User

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

test_case_router = APIRouter(prefix="/test-cases", tags=["external-systems-test-case"])


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


class CreateTestCaseRequest(BaseModel):
    """创建测试用例请求体。字段对齐 ``CreateTestCaseInput``（不含 created_by）。

    字段长度约束对齐 ``ExternalToolTestCase`` ORM 列定义，在边界层拦截非法输入：
    ``tool_slug`` 对齐 String(128) 且与工具子域 slug 规则一致、
    ``name`` 对齐 String(128)、``env_key``/``expected_status`` 对齐 String(32)、
    ``schedule_cron`` 对齐 String(64)、``timeout`` 对齐工具子域取值范围。
    """

    model_config = ConfigDict(frozen=True)

    tool_slug: str = Field(..., min_length=1, max_length=128, pattern=r"^[a-zA-Z_][a-zA-Z0-9_-]{0,127}$")
    name: str = Field(..., min_length=1, max_length=128)
    request_fixture: dict[str, Any]
    description: str | None = None
    env_key: str | None = Field(default=None, max_length=32)
    expected_status: str | None = Field(default=None, max_length=32)
    assertions: list[dict[str, Any]] = Field(default_factory=list)
    timeout: int = Field(default=30, ge=1, le=300)
    enabled: bool = True
    schedule_cron: str | None = Field(default=None, max_length=64)
    alert_on_failure: bool = True
    alert_threshold: int = Field(default=3, ge=1)


class UpdateTestCaseRequest(BaseModel):
    """更新测试用例请求体。字段对齐 ``UpdateTestCaseInput``（不含 id 与 updated_by）。

    字段长度约束对齐 ``ExternalToolTestCase`` ORM 列定义，仅透传客户端显式设置的字段
    （通过 ``exclude_unset=True``），未设置字段保持 ``None`` 以保留部分更新语义。
    """

    model_config = ConfigDict(frozen=True)

    name: str | None = Field(default=None, min_length=1, max_length=128)
    description: str | None = None
    env_key: str | None = Field(default=None, max_length=32)
    expected_status: str | None = Field(default=None, max_length=32)
    request_fixture: dict[str, Any] | None = None
    assertions: list[dict[str, Any]] | None = None
    timeout: int | None = Field(default=None, ge=1, le=300)
    enabled: bool | None = None
    schedule_cron: str | None = Field(default=None, max_length=64)
    alert_on_failure: bool | None = None
    alert_threshold: int | None = Field(default=None, ge=1)


class BatchExecuteTestCasesRequest(BaseModel):
    """批量执行测试用例请求体。字段对齐 ``BatchExecuteTestCasesInput``（不含 triggered_by）。"""

    model_config = ConfigDict(frozen=True)

    case_ids: list[int] = Field(..., min_length=1)
    stop_on_failure: bool = False


class CloneTestCaseRequest(BaseModel):
    """克隆测试用例请求体。字段对齐 ``CloneTestCaseInput``（不含 case_id 与 created_by）。"""

    model_config = ConfigDict(frozen=True)

    new_name: str = Field(..., min_length=1, max_length=128)


class BatchCloneTestCasesRequest(BaseModel):
    """批量克隆测试用例请求体。字段对齐 ``BatchCloneTestCasesInput``（不含 created_by）。"""

    model_config = ConfigDict(frozen=True)

    source_case_ids: list[int] = Field(..., min_length=1)
    name_suffix: str = "_copy"
    override_config: dict[str, Any] = Field(default_factory=dict)


class ImportTestCasesRequest(BaseModel):
    """导入测试用例请求体。"""

    model_config = ConfigDict(frozen=True)

    items: list[CreateTestCaseRequest] = Field(..., min_length=1, max_length=100)


class UpdateAlertConfigRequest(BaseModel):
    """更新告警配置请求体。字段对齐 ``UpdateAlertConfigInput``（不含 case_id 与 updated_by）。"""

    model_config = ConfigDict(frozen=True)

    alert_on_failure: bool
    alert_threshold: int = Field(ge=1)


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


@test_case_router.get("", response_model=dict)
async def list_test_cases(
    limit: int = Query(100, ge=1, le=500),
    offset: int = Query(0, ge=0),
    tool_slug: str | None = Query(None, max_length=128),
    env_key: str | None = Query(None, max_length=32),
    enabled: bool | None = Query(None),
    schedule_cron: str | None = Query(None, max_length=64),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """分页列出测试用例。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = ListTestCasesInput(
        page=offset // limit + 1,
        page_size=limit,
        tool_slug=tool_slug,
        env_key=env_key,
        enabled=enabled,
        schedule_cron=schedule_cron,
    )
    output = await use_cases.test_case_service.list_test_cases(input_dto)
    return {"success": True, "data": output.model_dump()}


@test_case_router.post("", response_model=dict)
async def create_test_case(
    payload: CreateTestCaseRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """创建测试用例。``created_by`` 由当前登录用户填充。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = CreateTestCaseInput(
        created_by=current_user.uid,
        **payload.model_dump(),
    )
    output = await use_cases.test_case_service.create_test_case(input_dto)
    return {"success": True, "data": output.model_dump()}


# ---------------- 静态路径端点（必须在 /{case_id} 之前声明） ----------------


@test_case_router.post("/batch-execute", response_model=dict)
async def batch_execute_test_cases(
    payload: BatchExecuteTestCasesRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """批量执行测试用例。``triggered_by`` 由当前登录用户填充。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = BatchExecuteTestCasesInput(
        case_ids=payload.case_ids,
        stop_on_failure=payload.stop_on_failure,
        triggered_by=current_user.uid,
    )
    output = await use_cases.test_case_service.batch_execute_test_cases(input_dto)
    return {"success": True, "data": output.model_dump()}


@test_case_router.post("/batch-clone", response_model=dict)
async def batch_clone_test_cases(
    payload: BatchCloneTestCasesRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """批量克隆测试用例。``created_by`` 由当前登录用户填充。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = BatchCloneTestCasesInput(
        source_case_ids=payload.source_case_ids,
        name_suffix=payload.name_suffix,
        override_config=payload.override_config,
        created_by=current_user.uid,
    )
    output = await use_cases.test_case_service.batch_clone_test_cases(input_dto)
    return {"success": True, "data": output.model_dump()}


@test_case_router.post("/import", response_model=dict)
async def import_test_cases(
    payload: ImportTestCasesRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """导入测试用例（JSON body）。``created_by`` 由当前登录用户填充。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = ImportTestCasesInput(
        items=[CreateTestCaseInput(**item.model_dump(), created_by=current_user.uid) for item in payload.items],
        created_by=current_user.uid,
    )
    output = await use_cases.test_case_service.import_test_cases(input_dto)
    return {"success": True, "data": output.model_dump()}


@test_case_router.get("/export")
async def export_test_cases(
    tool_slug: str | None = Query(None),
    env_key: str | None = Query(None),
    enabled: bool | None = Query(None),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> StreamingResponse:
    """导出测试用例为 JSON 文件。对齐 ``system_router.export_systems`` 模式。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = ExportTestCasesInput(
        tool_slug=tool_slug,
        env_key=env_key,
        enabled=enabled,
    )
    output = await use_cases.test_case_service.export_test_cases(input_dto)

    payload = json.dumps(
        [item.model_dump() for item in output.items],
        ensure_ascii=False,
        default=str,
    ).encode("utf-8")
    timestamp = datetime.now(UTC).strftime("%Y%m%d%H%M%S")

    async def _stream():
        yield payload

    return StreamingResponse(
        _stream(),
        media_type="application/octet-stream",
        headers={"Content-Disposition": f"attachment; filename=test_cases_{timestamp}.json"},
    )


@test_case_router.get("/{case_id}", response_model=dict)
async def get_test_case(
    case_id: int = Path(ge=1),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """获取测试用例详情。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = GetTestCaseInput(id=case_id)
    output = await use_cases.test_case_service.get_test_case(input_dto)
    return {"success": True, "data": output.model_dump()}


@test_case_router.put("/{case_id}", response_model=dict)
async def update_test_case(
    case_id: int = Path(ge=1),
    payload: UpdateTestCaseRequest = Body(...),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """更新测试用例。``updated_by`` 由当前登录用户填充。仅透传显式设置的字段。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = UpdateTestCaseInput(
        id=case_id,
        updated_by=current_user.uid,
        **payload.model_dump(exclude_unset=True),
    )
    output = await use_cases.test_case_service.update_test_case(input_dto)
    return {"success": True, "data": output.model_dump()}


@test_case_router.delete("/{case_id}", response_model=dict)
async def delete_test_case(
    case_id: int = Path(ge=1),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """删除测试用例。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = DeleteTestCaseInput(id=case_id)
    output = await use_cases.test_case_service.delete_test_case(input_dto)
    return {"success": True, "data": output.model_dump()}


# ---------------- 动态路径端点 /{case_id}/* ----------------


@test_case_router.post("/{case_id}/run", response_model=dict)
async def run_test_case(
    case_id: int = Path(ge=1),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """执行单个测试用例。``triggered_by`` 由当前登录用户填充。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = RunTestCaseInput(
        case_id=case_id,
        triggered_by=current_user.uid,
    )
    output = await use_cases.test_case_service.run_test_case(input_dto)
    return {"success": True, "data": output.model_dump()}


@test_case_router.post("/{case_id}/clone", response_model=dict)
async def clone_test_case(
    case_id: int = Path(ge=1),
    payload: CloneTestCaseRequest = Body(...),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """克隆测试用例。``created_by`` 由当前登录用户填充。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = CloneTestCaseInput(
        case_id=case_id,
        new_name=payload.new_name,
        created_by=current_user.uid,
    )
    output = await use_cases.test_case_service.clone_test_case(input_dto)
    return {"success": True, "data": output.model_dump()}


@test_case_router.get("/{case_id}/alert-config", response_model=dict)
async def get_alert_config(
    case_id: int = Path(ge=1),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_required_user),
) -> dict[str, Any]:
    """查询测试用例告警配置。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = GetAlertConfigInput(case_id=case_id)
    output = await use_cases.test_case_service.get_alert_config(input_dto)
    return {"success": True, "data": output.model_dump()}


@test_case_router.put("/{case_id}/alert-config", response_model=dict)
async def update_alert_config(
    case_id: int = Path(ge=1),
    payload: UpdateAlertConfigRequest = Body(...),
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_admin_user),
) -> dict[str, Any]:
    """更新测试用例告警配置。``updated_by`` 由当前登录用户填充。"""
    use_cases = create_use_cases_from_db(db)
    input_dto = UpdateAlertConfigInput(
        case_id=case_id,
        alert_on_failure=payload.alert_on_failure,
        alert_threshold=payload.alert_threshold,
        updated_by=current_user.uid,
    )
    output = await use_cases.test_case_service.update_alert_config(input_dto)
    return {"success": True, "data": output.model_dump()}