import time

from django.db import transaction
from rest_framework import status, viewsets
from rest_framework.decorators import action
from rest_framework.response import Response

from fwd import settings
from ..annotation.api import throw_on_failure
from ..exception.exceptions import ServiceUnavailableException, \
    LimitReachedException
from ..models import OcrTemplateBox
from ..models.OcrTemplate import OcrTemplate
from ..request.CreateTemplateRequest import CreateTemplateRequest
from ..constant.common import EntityStatus, TEMPLATE_ID
from ..exception.exceptions import InvalidException
from ..request.UpdateTemplateRequest import UpdateTemplateRequest
from ..response.TemplateResponse import TemplateResponse
from ..utils import file as FileUtils
from ..utils import process as ProcessUtil
from ..utils.process import UserData
from drf_spectacular.utils import extend_schema


class CtelTemplateViewSet(viewsets.ViewSet):
    lookup_field = "username"
    base_url = settings.BASE_URL

    @extend_schema(request=None, responses=None, tags=['templates'], methods=['GET'])
    @extend_schema(request={
        'multipart/form-data': {
            'type': 'object',
            'properties': {
                'files': {
                    'type': 'string',
                    'format': 'binary',
                },
                'template_id': {
                    'type': 'string',
                    'description': '<b>Required if updateTemplate</b>'
                },
                'template_name': {
                    'type': 'string',
                },
                'data_box_names': {
                    'type': 'string',
                },
                'data_boxs': {
                    'type': 'string',
                },
                'anchor_boxs': {
                    'type': 'string',
                },
            },
            'required': {'template_name', 'data_box_names', 'data_boxs', 'anchor_boxs', 'file'}
        }
    }, responses=None, tags=['templates'], methods=['POST'])
    @action(detail=False, methods=["POST", "GET"])
    @throw_on_failure(InvalidException(excArgs='data'))
    def templates(self, request):
        user_data = ProcessUtil.get_user(request)

        if request.method == "POST":
            return self.upsert_template(request, user_data)
        else:
            return self.get_template(request, user_data)

    @extend_schema(request=None, responses=None, tags=['templates'])
    @action(detail=False, methods=["DELETE"], url_path=r"templates/(?P<template_id>\d+)")
    @throw_on_failure(InvalidException(excArgs='data'))
    def delete_template(self, request, template_id=None):
        user_data: UserData = ProcessUtil.get_user(request)

        if not template_id:
            raise InvalidException(excArgs=TEMPLATE_ID)
        template = OcrTemplate.objects.filter(id=template_id, subscription=user_data.current_sub)
        if len(template) != 1:
            raise InvalidException(excArgs=TEMPLATE_ID)
        template = template[0]
        old_path = template.file_path
        deleted, _rows_count = template.delete()
        if not deleted:
            raise ServiceUnavailableException()
        # Delete file
        FileUtils.delete_file_with_path(old_path)

        return Response(status=status.HTTP_200_OK, data={
            'template_id': template_id
        })

    def get_template(self, request, u_data: UserData):
        tem_id = request.query_params.get('template_id', None)

        if tem_id:
            tem_id: int = int(tem_id)
            template = OcrTemplate.objects.filter(id=tem_id, subscription=u_data.current_sub)
            if len(template) != 1:
                raise InvalidException(excArgs=TEMPLATE_ID)
            rs = TemplateResponse(data=template)
            rs.is_valid()
            return Response(status=status.HTTP_200_OK, data=rs.validated_data)

        else:
            template = OcrTemplate.objects.filter(subscription=u_data.current_sub)
            rs = TemplateResponse(template, many=True)
            return Response(status=status.HTTP_200_OK, data=rs.data)

    def upsert_template(self, request, user_data: UserData):
        if 'template_id' in request.data:
            return self.update_template(request, user_data)
        else:
            return self.insert_template(request, user_data)

    def insert_template(self, request, user_data: UserData):
        file_list = request.data.getlist('file')
        FileUtils.validate_list_file(file_list)
        sub = user_data.current_sub

        # Check request
        serializer = CreateTemplateRequest(data=request.data)
        serializer.is_valid()
        if not serializer.is_valid():
            print(serializer.errors)
            raise InvalidException(excArgs=list(serializer.errors.keys()))
        data = serializer.validated_data

        # Check total
        templates = OcrTemplate.objects.filter(subscription=sub)
        if len(templates) >= settings.MAX_NUMBER_OF_TEMPLATE:
            raise LimitReachedException(excArgs=('Number of template', str(settings.MAX_NUMBER_OF_TEMPLATE), ''))


        # Create
        template: OcrTemplate = OcrTemplate(status=EntityStatus.ACTIVE.value, name=data['template_name'], subscription=sub)
        template.save()

        file_obj = file_list[0]
        file_name = str(round(time.time() * 1000)) + '_tem_' + file_obj.name
        file_path = FileUtils.save_template_file(file_name, template, file_obj, 100)
        template.file_path = file_path
        template.file_name = file_name
        template.save()
        ProcessUtil.save_template_boxs(data, template)

        return Response(status=status.HTTP_200_OK, data={
            "id": template.id,
        })

    def update_template(self, request, user_data: UserData):
        # Validate
        data = request.data
        file_list = data.getlist('file')
        file_obj = file_list[0]
        FileUtils.validate_list_file(file_list)
        serializer = UpdateTemplateRequest(data=data)
        serializer.is_valid()
        if not serializer.is_valid():
            print(serializer.errors)
            raise InvalidException(excArgs=list(serializer.errors.keys()))
        data = serializer.validated_data

        template = OcrTemplate.objects.filter(id=data['template_id'], subscription=user_data.current_sub)
        if len(template) != 1:
            raise InvalidException(excArgs=TEMPLATE_ID)
        template = template[0]
        old_path = template.file_path
        template.name = data['template_name']

        file_path = FileUtils.save_template_file(template.file_name, template, file_obj, 100)
        template.file_path = file_path
        template.save()
        # Delete Old
        OcrTemplateBox.objects.filter(template=template).delete()
        # FileUtils.delete_file_with_path(old_path)

        ProcessUtil.save_template_boxs(data, template)
        return Response(status=status.HTTP_200_OK, data={
            'template_id': template.id,
        })