# =============================================================================
# IT智能服务台 — 审批流程 API
# =============================================================================
# 说明：提供审批模板管理和API提交功能
#   - 模板详情获取
#   - API提交审批申请
#   - 审批状态回调处理
# =============================================================================

import logging
import os
from typing import Optional

import httpx
from fastapi import APIRouter, Depends, Query
from pydantic import BaseModel
import redis.asyncio as aioredis

from app.config import settings
from app.utils.token_manager import ApprovalTokenManager

logger = logging.getLogger(__name__)
router = APIRouter()

# Redis客户端（依赖注入）
async def get_redis() -> aioredis.Redis:
    """获取Redis客户端依赖"""
    from app.main import redis_client
    return redis_client


# =============================================================================
# 审批模板配置（从环境变量读取）
# =============================================================================
# 环境变量：
#   APPROVAL_TEMPLATE_RESOURCE - 资源申请模板ID
#   APPROVAL_TEMPLATE_DEVICE  - 设备申请模板ID

APPROVAL_TEMPLATE_RESOURCE = os.getenv("APPROVAL_TEMPLATE_RESOURCE", "")
APPROVAL_TEMPLATE_DEVICE = os.getenv("APPROVAL_TEMPLATE_DEVICE", "")

# 动态构建审批模板配置
APPROVAL_TEMPLATES = {}

if APPROVAL_TEMPLATE_RESOURCE:
    APPROVAL_TEMPLATES[APPROVAL_TEMPLATE_RESOURCE] = {
        "id": APPROVAL_TEMPLATE_RESOURCE,
        "name": "资源申请",
        "type": "jump",
        "keywords": ["申请资源", "要资源", "申请"],
    }

if APPROVAL_TEMPLATE_DEVICE:
    APPROVAL_TEMPLATES[APPROVAL_TEMPLATE_DEVICE] = {
        "id": APPROVAL_TEMPLATE_DEVICE,
        "name": "设备申请",
        "type": "api",
        "keywords": ["申请设备", "要设备", "电脑", "笔记本"],
    }


# =============================================================================
# Schema 定义
# =============================================================================

class ApprovalTemplateResponse(BaseModel):
    """审批模板响应"""
    id: str
    name: str
    type: str
    keywords: list[str]


class ApprovalJumpRequest(BaseModel):
    """跳转审批请求"""
    template_id: str
    employee_id: Optional[str] = None


class ApprovalJumpResponse(BaseModel):
    """跳转审批响应"""
    url: str
    template_name: str


class ApprovalContentItem(BaseModel):
    """审批表单控件内容"""
    control: str  # 控件类型: Text, Textarea, Number, Money, Date, Selector, Contact, etc.
    id: str        # 控件ID
    value: dict    # 控件值


class ApprovalSubmitRequest(BaseModel):
    """API提交审批请求"""
    template_id: str
    employee_id: str          # 申请人userid
    contents: list[ApprovalContentItem]  # 表单内容
    use_template_approver: int = 1  # 1-使用模板预设流程


class ApprovalSubmitResponse(BaseModel):
    """API提交审批响应"""
    sp_no: str  # 审批单号
    template_name: str


class ApprovalCallbackRequest(BaseModel):
    """审批回调请求（XML解析后的模型）"""
    sp_no: str
    sp_name: str
    template_id: str
    apply_time: int
    applyer_userid: str
    sp_status: int  # 1-审批中 2-已通过 3-已驳回 4-已撤销 6-通过后撤销 7-已删除 10-已支付
    status_change_event: int  # 1-提单 2-同意 3-驳回 4-转审 5-催办 6-撤销 8-通过后撤销 10-添加备注


# =============================================================================
# 企微API调用辅助函数
# =============================================================================

async def get_approval_token(redis: aioredis.Redis) -> str:
    """获取审批应用access_token"""
    manager = ApprovalTokenManager(redis)
    return await manager.get_token()


async def get_template_detail(access_token: str, template_id: str) -> dict:
    """获取审批模板详情

    对应企微API:
        POST https://qyapi.weixin.qq.com/cgi-bin/oa/gettemplatedetail

    返回模板内的控件构成及控件ID
    """
    url = "https://qyapi.weixin.qq.com/cgi-bin/oa/gettemplatedetail"
    params = {"access_token": access_token}

    async with httpx.AsyncClient(timeout=httpx.Timeout(connect=10.0, read=30.0)) as client:
        response = await client.post(url, params=params, json={"template_id": template_id})
        result = response.json()

        if result.get("errcode") != 0:
            logger.error(f"获取模板详情失败: {result.get('errmsg')}")
            raise Exception(f"获取模板详情失败: {result.get('errmsg')}")

        return result


async def submit_approval_api(
    access_token: str,
    template_id: str,
    creator_userid: str,
    contents: list[dict],
    use_template_approver: int = 1
) -> dict:
    """提交审批申请

    对应企微API:
        POST https://qyapi.weixin.qq.com/cgi-bin/oa/applyevent

    Args:
        access_token: 审批应用access_token
        template_id: 模板ID
        creator_userid: 申请人userid
        contents: 表单控件内容列表
        use_template_approver: 1-使用模板预设流程

    Returns:
        {"sp_no": "审批单号"}
    """
    url = "https://qyapi.weixin.qq.com/cgi-bin/oa/applyevent"
    params = {"access_token": access_token}

    payload = {
        "creator_userid": creator_userid,
        "template_id": template_id,
        "use_template_approver": use_template_approver,
        "apply_data": {
            "contents": contents
        }
    }

    async with httpx.AsyncClient(timeout=httpx.Timeout(connect=10.0, read=30.0)) as client:
        response = await client.post(url, params=params, json=payload)
        result = response.json()

        if result.get("errcode") != 0:
            logger.error(f"提交审批失败: {result.get('errmsg')}")
            raise Exception(f"提交审批失败: {result.get('errmsg')}")

        return {"sp_no": result.get("sp_no")}


# =============================================================================
# API 端点
# =============================================================================

@router.get("/approval/templates", response_model=list[ApprovalTemplateResponse])
async def get_approval_templates():
    """获取所有审批模板列表"""
    return list(APPROVAL_TEMPLATES.values())


@router.get("/approval/templates/{template_id}", response_model=ApprovalTemplateResponse)
async def get_approval_template(template_id: str):
    """获取指定审批模板详情"""
    if template_id not in APPROVAL_TEMPLATES:
        from fastapi import HTTPException
        raise HTTPException(status_code=404, detail="模板不存在")
    return APPROVAL_TEMPLATES[template_id]


@router.get("/approval/templates/{template_id}/detail")
async def get_template_full_detail(
    template_id: str,
    redis: aioredis.Redis = Depends(get_redis)
):
    """获取审批模板完整详情（控件结构）"""
    if template_id not in APPROVAL_TEMPLATES:
        from fastapi import HTTPException
        raise HTTPException(status_code=404, detail="模板不存在")

    try:
        token = await get_approval_token(redis)
        detail = await get_template_detail(token, template_id)
        return detail
    except Exception as e:
        from fastapi import HTTPException
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/approval/jump", response_model=ApprovalJumpResponse)
async def create_approval_jump(request: ApprovalJumpRequest):
    """生成跳转审批链接"""
    template = APPROVAL_TEMPLATES.get(request.template_id)
    if not template:
        from fastapi import HTTPException
        raise HTTPException(status_code=404, detail="模板不存在")

    if template["type"] != "jump":
        from fastapi import HTTPException
        raise HTTPException(status_code=400, detail="该模板不支持跳转方式")

    # 生成跳转URL（企微审批链接格式）
    jump_url = f"https://qyapi.weixin.qq.com/cgi-bin/oa/applyevent?access_token=TOKEN&template_id={request.template_id}"

    return ApprovalJumpResponse(
        url=jump_url,
        template_name=template["name"],
    )


@router.post("/approval/submit", response_model=ApprovalSubmitResponse)
async def submit_approval(
    request: ApprovalSubmitRequest,
    redis: aioredis.Redis = Depends(get_redis)
):
    """API提交审批申请"""
    template = APPROVAL_TEMPLATES.get(request.template_id)
    if not template:
        from fastapi import HTTPException
        raise HTTPException(status_code=404, detail="模板不存在")

    if template["type"] != "api":
        from fastapi import HTTPException
        raise HTTPException(status_code=400, detail="该模板不支持API提交")

    try:
        # 1. 获取审批token
        token = await get_approval_token(redis)

        # 2. 转换contents格式
        contents = [item.model_dump() for item in request.contents]

        # 3. 提交审批
        result = await submit_approval_api(
            access_token=token,
            template_id=request.template_id,
            creator_userid=request.employee_id,
            contents=contents,
            use_template_approver=request.use_template_approver
        )

        return ApprovalSubmitResponse(
            sp_no=result["sp_no"],
            template_name=template["name"],
        )

    except Exception as e:
        from fastapi import HTTPException
        raise HTTPException(status_code=500, detail=str(e))


@router.post("/approval/callback")
async def approval_callback(
    sp_no: str = Query(...),
    sp_name: str = Query(...),
    template_id: str = Query(...),
    apply_time: int = Query(...),
    applyer_userid: str = Query(...),
    sp_status: int = Query(...),
    status_change_event: int = Query(...)
):
    """审批状态变化回调处理

    对应企微审批回调事件: sys_approval_change

    状态变化类型 (status_change_event):
        1 - 提单
        2 - 同意
        3 - 驳回
        4 - 转审
        5 - 催办
        6 - 撤销
        8 - 通过后撤销
        10 - 添加备注

    审批单状态 (sp_status):
        1 - 审批中
        2 - 已通过
        3 - 已驳回
        4 - 已撤销
        6 - 通过后撤销
        7 - 已删除
        10 - 已支付
    """
    logger.info(f"审批回调: sp_no={sp_no}, status={sp_status}, event={status_change_event}")

    # TODO: 根据业务需求处理审批状态变化
    # 例如：
    # - 审批通过后，更新IT服务台待办状态
    # - 审批驳回后，通知申请人
    # - 审批撤销后，关闭相关工单

    event_map = {
        1: "submitted",
        2: "approved",
        3: "rejected",
        4: "transferred",
        5: "reminded",
        6: "revoked",
        8: "revoked_after_approved",
        10: "commented"
    }

    event_type = event_map.get(status_change_event, f"unknown_{status_change_event}")
    logger.info(f"审批事件类型: {event_type}")

    return {"errcode": 0, "errmsg": "ok"}


@router.get("/approval/keywords")
async def get_approval_keywords():
    """获取所有审批关键词（用于前端关键词检测）"""
    keywords = []
    for template in APPROVAL_TEMPLATES.values():
        for kw in template["keywords"]:
            keywords.append({
                "keyword": kw,
                "template_id": template["id"],
                "template_name": template["name"],
                "type": template["type"],
            })
    return keywords