# coding: utf-8
import datetime
import random
from typing import Union

import pandas as pd
from sqlalchemy import select, delete
from tornado_swagger.model import register_swagger_model
from wtforms import StringField, TextAreaField, IntegerField, DateTimeField
from wtforms.validators import Length

import models
from models.db_models import TD3iGovsWorkOrderReturnFormal
from models.common_model import CommonModel
from paste.core.logging import echo_log
from paste.rbac.rbac_user import RbacUser
from paste.util.pagination import Pagination
from paste.web.form import ModelForm


class GovsWorkOrderReturnFormalForm(ModelForm):
    """工单退回表单验证类"""

    id = IntegerField('主键')
    master_id = IntegerField('主表ID')
    master_id = StringField('代签收唯一标志', validators=[Length(max=64)])
    return_reason = StringField('退回原因', validators=[Length(max=255)])
    return_reason_name = StringField('退回原因名称', validators=[Length(max=255)])
    return_auditor_name = StringField('退回审核人', validators=[Length(max=100)])
    return_auditor_id = StringField('退回审核人ID', validators=[Length(max=64)])
    deal_opinion = TextAreaField('处理意见')
    reason = TextAreaField('处理意见2')
    remark = StringField('备注', validators=[Length(max=500)])
    file_id_str = TextAreaField('OA文件id')
    process_instance_id = StringField('流程实例ID', validators=[Length(max=64)])
    action_name = StringField('操作名称', validators=[Length(max=255)])
    order_id = StringField('工单ID', validators=[Length(max=64)])
    task_id = StringField('任务ID', validators=[Length(max=64)])
    order_no = StringField('工单号', validators=[Length(max=64)])
    case_accord_type_one_name = StringField('诉求归口一级名称', validators=[Length(max=255)])
    case_accord_type_two_name = StringField('诉求归口二级名称', validators=[Length(max=255)])
    case_accord_type_three_name = StringField('诉求归口三级名称', validators=[Length(max=255)])
    save_status = IntegerField('提交状态')
    oa_feedback_status = IntegerField('OA反馈状态')
    flow_token = StringField('流令牌', validators=[Length(max=256)])
    created_at = DateTimeField('创建时间')
    created_by = StringField('创建者', validators=[Length(max=64)])
    updated_at = DateTimeField('更新时间')
    updated_by = StringField('更新者', validators=[Length(max=64)])

    def process(self, formdata=None, obj=None, **kwargs):
        if formdata:
            for name, values in formdata.items():
                if isinstance(values, list) and values:
                    formdata[name] = [v.strip() if isinstance(v, str) else v for v in values]
                elif isinstance(values, str):
                    formdata[name] = values.strip()
        super().process(formdata, obj, **kwargs)


class GovsWorkOrderReturnFormalBase(TD3iGovsWorkOrderReturnFormal, CommonModel):
    """工单退回业务基类"""

    FieldMapping = {
        # 主键 & 关联ID
        'id': 'id',
        'master_id': 'gdId',
        'gd_id': 'gdId',
        'order_id': 'orderId',
        'order_no': 'orderNo',
        'process_instance_id': 'processInstanceId',
        'task_id': 'taskId',

        # 退回核心信息
        'return_reason': 'returnReason',
        'return_reason_name': 'returnReasonName',
        'return_auditor_name': 'returnAuditorName',
        'return_auditor_id': 'returnAuditorId',

        # 处理意见 & 备注
        'deal_opinion': 'dealOpinion',
        'reason': 'reason',
        'remark': 'remark',
        'file_id_str': 'fileIdStr',

        # 流程 & 分类信息
        'action_name': 'actionName',
        'case_accord_type_one_name': 'caseAccordTypeOneName',
        'case_accord_type_two_name': 'caseAccordTypeTwoName',
        'case_accord_type_three_name': 'caseAccordTypeThreeName',

        # 状态 & 令牌
        'flow_token': 'flowToken',
    }

    @classmethod
    async def exist_other(cls, id: Union[str, int], master_id: Union[str, int] = None, order_id: str = None,
                          order_no: str = None):
        """检查是否存在除当前记录外的同唯一标识工单退回记录"""
        _query = select(cls).where(cls.id != id)
        if master_id:
            _query = _query.where(cls.master_id == master_id)
        if order_id:
            _query = _query.where(cls.order_id == order_id)
        if order_no:
            _query = _query.where(cls.order_no == order_no)
        _task: cls = await cls.query_first(_query)
        return _task

    @classmethod
    async def find_by_ids(cls, ids: list[Union[str, int]]):
        """根据ID列表批量查询工单退回记录"""
        _query = select(cls).where(cls.id.in_(ids))
        _list: list[cls] = (await cls.orm_execute_scalars(_query)).all()
        return _list

    @classmethod
    async def is_exist(cls, master_id: Union[str, int] = None, order_id: str = None, order_no: str = None):
        """检查工单退回记录是否已存在"""
        _query = select(cls)
        if master_id:
            _query = _query.where(cls.master == master_id)
        if order_id:
            _query = _query.where(cls.order_id == order_id)
        if order_no:
            _query = _query.where(cls.order_no == order_no)
        _task: cls = await cls.query_first(_query)
        return _task

    @classmethod
    async def search_base(cls, is_paging=True, **kwargs):
        """工单退回基础搜索（分页/不分页）"""
        page_number = kwargs.get('page_number', random.randint(1, 100))
        page_size = kwargs.get('page_size', 20)
        kwargs.update({'page_number': page_number, 'page_size': page_size})

        # 模糊查询字段配置
        _name_likes = {
            cls.master_id.key: '%{}%',
            cls.order_no.key: '%{}%',
            cls.return_reason.key: '%{}%',
        }

        _query = select(cls).where(
            *cls.search_wheres(likes=_name_likes, **kwargs)
        ).group_by(cls.id)

        _paging = None
        if is_paging:
            _row_count = await cls.query_count(_query)
            _paging = Pagination(_row_count).paging(page_number, page_size)
            _data_query = _query.limit(page_size).offset(_paging.offset_size)
        else:
            _data_query = _query.where()

        # 排序处理
        _sort_clause = cls.sort_clauses(kwargs.get('sort_clause', {}))
        if _sort_clause:
            _data_query = _data_query.order_by(*_sort_clause)
        else:
            _data_query = _data_query.order_by(cls.created_at.desc())

        _df = await cls.query_as_df(_data_query)
        if not _df.empty:
            _df.replace(models.EmptyInDF + models.EmptyDatetimeInDF, '', inplace=True)
            _df[cls.id.key] = _df[cls.id.key].astype(str)

        return _df, _paging

    @classmethod
    async def search(cls, **kwargs):
        """分页搜索工单退回记录，返回标准分页结构"""
        _df, _paging = await cls.search_base(**kwargs)
        return {
            'total': _paging.row_count,
            'rows': _df.to_dict('records'),
            'pagination': {
                'page_number': _paging.page_number,
                'page_count': _paging.page_count,
                'page_size': _paging.page_size,
            },
        }

    @classmethod
    async def exists_master_id(cls, data_df: pd.DataFrame):
        """根据 master_id 区分已有数据/新增数据（批量保存用）"""
        if data_df.empty:
            return pd.DataFrame(), pd.DataFrame()

        master_ids = data_df[cls.master_id.key].unique().tolist()
        if not master_ids:
            return pd.DataFrame(), data_df.copy()

        _query = select(cls.id, cls.master_id).where(cls.master_id.in_(master_ids))
        existing_df = await cls.query_as_df(_query)

        if existing_df.empty:
            return pd.DataFrame(), data_df.copy()

        master_id_to_id_map = dict(zip(existing_df[cls.master_id.key], existing_df[cls.id.key]))
        mask_exists = data_df[cls.master_id.key].isin(existing_df[cls.master_id.key])
        exists_df = data_df[mask_exists].copy()
        exists_df[cls.id.key] = exists_df[cls.master_id.key].map(master_id_to_id_map)
        latest_df = data_df[~mask_exists].copy()
        return exists_df, latest_df

    @classmethod
    async def find_by_master_id(cls, master_id: Union[str, int]):
        """根据主表ID查询单条退回记录"""
        _query = select(cls).where(cls.master_id == master_id)
        return await cls.query_first(_query)

    @classmethod
    async def find_by_master_id(cls, master_id: str):
        """根据代签收唯一标志查询退回记录"""
        _query = select(cls).where(cls.master_id == master_id)
        return await cls.query_first(_query)

    @classmethod
    async def find_by_order_id(cls, order_id: str):
        """根据工单ID查询退回记录"""
        _query = select(cls).where(cls.order_id == order_id)
        return await cls.query_first(_query)

    @classmethod
    async def find_by_master_ids(cls, master_ids: list[Union[str, int]]):
        """根据主表ID列表批量查询退回记录"""
        _query = select(cls).where(cls.master_id.in_(master_ids))
        _list: list[cls] = (await cls.orm_execute_scalars(_query)).all()
        return _list


@register_swagger_model
class GovsWorkOrderReturnFormal(GovsWorkOrderReturnFormalBase):
    """工单退回业务操作类"""

    @classmethod
    async def create(cls, user: RbacUser = None, **kwargs):
        """新增工单退回记录"""
        for _k, _v in kwargs.items():
            if isinstance(_v, str):
                kwargs[_k] = _v.strip()

        _form = GovsWorkOrderReturnFormalForm(formdata=kwargs)
        _form.validate_form()

        _existing = await cls.is_exist(
            master_id=_form.master_id.data,
            order_id=_form.order_id.data,
            order_no=_form.order_no.data
        )
        assert _existing is None, "该任务已存在工单退回记录，无法重复创建。"

        _return_info = cls().copy_from_dict(_form.data, skip_none=True).before_save()
        if user:
            _return_info.created_by = user.username
            _return_info.updated_by = user.username
        await _return_info.async_save()
        return _return_info

    @classmethod
    async def delete(cls, return_id: Union[str, int]):
        """删除工单退回记录"""
        _return_info: cls = await cls.async_find_by_id(return_id)
        assert _return_info, f"根据 ID {return_id} 未找到工单退回记录。"

        _del_query = delete(cls).where(cls.id == _return_info.id)
        await cls.raw_execute(_del_query)
        echo_log(f'已删除工单退回记录（工单ID：{_return_info.master_id}，ID：{_return_info.id}）.')
        return _return_info

    @classmethod
    async def modify(cls, return_id: Union[str, int], user: RbacUser = None, **kwargs):
        """修改工单退回记录"""
        for _k, _v in kwargs.items():
            if isinstance(_v, str):
                kwargs[_k] = _v.strip()

        _form = GovsWorkOrderReturnFormalForm(formdata=kwargs)
        _form.validate_form()

        _return_info: cls = await cls.async_find_by_id(return_id)
        assert _return_info, f'查无此工单退回记录。'

        _return_info.copy_from_dict(_form.data, skip_none=True).before_save()
        if user:
            _return_info.updated_by = user.username
        await _return_info.async_save()
        return _return_info

    @classmethod
    async def create_batch(cls, data_df: pd.DataFrame, user: RbacUser = None):
        """批量新增工单退回记录"""
        if data_df.empty:
            return 0

        if user:
            data_df['created_by'] = user.username
            data_df['updated_by'] = user.username

        records = data_df.to_dict('records')
        return_list = [cls().copy_from_dict(record, skip_none=True).before_save() for record in records]

        session = cls.get_aio_session()
        try:
            session.add_all(return_list)
            await session.commit()
        except Exception as e:
            await session.rollback()
            raise e
        finally:
            await session.close()
        echo_log(f"批量创建成功：创建 {len(return_list)} 条工单退回记录。")
        return len(return_list)

    @classmethod
    async def modify_batch(cls, data_df: pd.DataFrame, user: RbacUser = None):
        """批量修改工单退回记录"""
        if data_df.empty:
            return 0

        if 'id' not in data_df.columns:
            echo_log(f"错误：modify_batch 要求输入数据必须包含 '{cls.id.key}' 列")
            return 0

        data_df['updated_at'] = datetime.datetime.now()
        if user:
            data_df['updated_by'] = user.username

        update_data = data_df.to_dict('records')
        session = cls.get_aio_session()
        try:
            await session.run_sync(
                lambda sync_session: sync_session.bulk_update_mappings(cls, update_data)
            )
            await session.commit()
            updated_count = len(update_data)
        except Exception as e:
            await session.rollback()
            raise e
        finally:
            await session.close()

        echo_log(f"批量修改成功：更新 {updated_count} 条工单退回记录。")
        return updated_count

    @classmethod
    async def save_batch(cls, data_df: pd.DataFrame, user: RbacUser = None):
        """批量保存（自动区分新增/更新）"""
        _exists_df, _latest_df = await cls.exists_master_id(data_df)
        _created_count = await cls.create_batch(_latest_df, user)
        _updated_count = await cls.modify_batch(_exists_df, user)
        return _created_count, _updated_count