import json
import uuid

from django.apps import apps
from django.core.exceptions import ValidationError
from django.shortcuts import render

from django.contrib.auth.decorators import login_required
from django.http import JsonResponse, HttpResponse
from django.views.decorators.csrf import csrf_protect

from application.fac_mgnt.models import InvoiceRecord
from application.org_mgnt.models import SecondaryDepartment, PrimaryDepartment
from application.pjt_mgnt.models import ProjectLedger


def error_page(request):
    return render(request, 'error_page.html')


@csrf_protect
@login_required
def save_excel_table_data(request):
    if request.method == 'POST':
        try:
            data = json.loads(request.body)
            model_config = data.get('model_config')
            table_data = data.get('table_data')

            if not model_config or not table_data:
                return JsonResponse({'error': '缺少必要的参数'}, status=400)

            # 分割 model_config 以获取 app_label 和 model_name
            try:
                app_label, model_name = model_config.split('.')
                Model = apps.get_model(app_label, model_name)
            except (ValueError, LookupError):
                return JsonResponse({'error': '无效的 model_config'}, status=400)

            instances = []
            for row_data in table_data:
                instance_data = {}
                for field_name, value in row_data.items():
                    field = Model._meta.get_field(field_name)
                    if field.is_relation:
                        related_model = field.related_model
                        related_field_name_list = related_model._meta.fields
                        for related_field_name in related_field_name_list:
                            try:
                                related_instance = related_model.objects.get(**{related_field_name.name: value})
                                value = related_instance
                                instance_data[field_name] = value
                                break
                            except Exception:
                                continue
                    else:
                        instance_data[field_name] = value
                instance = Model(**instance_data)
                try:
                    instance.full_clean()
                    instances.append(instance)
                except ValidationError as e:
                    return JsonResponse({'error': f'数据校验错误: {e.message_dict}'}, status=400)

            # 批量保存数据
            Model.objects.bulk_create(instances)

            return JsonResponse({'success': '数据保存成功'}, status=201)
        except json.JSONDecodeError:
            return JsonResponse({'error': '无效的JSON数据'}, status=400)
        except Exception as e:
            return JsonResponse({'error': f'保存数据时出错: {str(e)}'}, status=500)

    return JsonResponse({'error': '请求错误'}, status=400)


@login_required
def load_secondary_departments(request):
    try:
        primary_department_name = request.GET.get('primary_department')
        primary_department = PrimaryDepartment.objects.get(department_name=primary_department_name)
        secondary_departments = SecondaryDepartment.objects.filter(primary_department_id=primary_department.primary_department_id).order_by('secondary_department_name')

        # 创建 HTML 字符串
        options = '<option value="">选择二级部门</option>'
        for dept in secondary_departments:
            options += f'<option value="{dept.secondary_department_name}">{dept.secondary_department_name}</option>'

        return HttpResponse(options)
    except Exception as e:
        return HttpResponse('')