from rest_framework import status
from rest_framework.exceptions import ValidationError

from api.models import TtStaff, TtTagRelation, TtLocation, TtModule
from api.models.tt_activity import TtActivity
from api.translation import __
from api.utils import log_critical_error, get_exception_detail
from api.validator import BaseValidator
from api.views.admin.base import AdminApiBase

class ModuleList(AdminApiBase):
    def validate_request(self,request):
        rules = {
            "academic_term_id": "required|exists:api.TtAcademicTerm,id",
            "filter": "nullable",
            "page": "nullable",
            "per_page": "nullable",
            "sort_by": "nullable",
            "order_by": "nullable",
        }
        # if need rename field, can put here
        attribute = {
            # "email": __("attr.email"),
        }
        # validate id first, cause need get pos by id, if wrong id direct return error
        validator = BaseValidator(request.data,rules,attribute)
        error = validator.validate()
        if error:
            raise ValidationError(error)

    def post(self, request):
        try:
            self.api_log_skip_outgoing_data=True
            self.validate_request(request)

            data = self.get_data(request)
            response = data
            return self.api_response(data=response)
        except ValidationError as e:
            first_message = e.detail['error']
            errors = e.detail['errors']
            return self.api_response(error=first_message,errors=errors,code=status.HTTP_400_BAD_REQUEST)
        except Exception as e:
            e_details = get_exception_detail(e)
            log_critical_error(user_id=None,descr=e_details['descr'],url=e_details['url'],trace=e_details['trace'])
            return self.api_response(error=__("message.internal_server_error"),code=status.HTTP_500_INTERNAL_SERVER_ERROR)

    def get_data(self,request):
        modules = (
            TtModule.objects
            .filter(academic_term_id=request.data.get('academic_term_id'))
            .select_related("department","academic_term","week_pattern","availability","start_preference","usage_preference")
            .prefetch_related(
                "week",
                "week_pattern__week",
                "tag__tag", #tags means the relation add in models, __tag means the relation table tag_id get the tag object
                "ttactivity_set__student_set"
            )
            .order_by(self.list_default_order_column)
        )
        return_data=[]

        modules = self.listing_filter(request, modules)
        
        paginated_details = self.listing_pagination(request, modules)
        total = paginated_details["total"]
        paginated_data = paginated_details["paginated_data"]
        page = paginated_details["page"]
        return_data=[]

        for val in paginated_data:
            #calculate sum of student_set's planned_size
            real_size = 0
            ignored = []
            if val.ttactivity_set.all():
                for act in val.ttactivity_set.all():
                    if act.student_set.all():
                        for sset in act.student_set.all():
                            if(sset.id not in ignored):
                                real_size += (sset.planned_size or 0)
                                ignored.append(sset.id)

            data={}
            data["id"] = val.id
            data["code"] = val.code
            data["name"] = val.name
            data['desc'] = val.desc
            data['department'] = val.department.name if val.department else None
            data['department_id'] = val.department_id
            data['academic_term'] = val.academic_term.name if val.academic_term else None
            data['academic_term_id'] = val.academic_term_id
            data['planned_size'] = val.planned_size
            data['real_size'] = real_size
            data['credit_provided'] = val.credit_provided

            data["week_pattern_id"] = val.week_pattern.id if val.week_pattern else None
            data["week_pattern_name"] = val.week_pattern.name if val.week_pattern else "-"
            if val.week_pattern:
                data["week_pattern"] = [
                    {"id": week.id, "week": week.week, "start_date": week.start_date}
                    for week in val.week_pattern.week.all()
                ]
            else:
                data["week_pattern"] = [
                    {"id": week.id, "week": week.week, "start_date": week.start_date}
                    for week in val.week.all()
                ]
            data["availability_id"] = val.availability.id if val.availability else None
            data["availability_name"] = val.availability.name if val.availability else "-"
            data["availability_pattern"] = val.availability.pattern if val.availability else val.availability_pattern
            data["start_preference_id"] = val.start_preference.id if val.start_preference else None
            data["start_preference_name"] = val.start_preference.name if val.start_preference else "-"
            data["start_preference_pattern"] = val.start_preference.pattern if val.start_preference else val.start_preference_pattern
            data["usage_preference_id"] = val.usage_preference.id if val.usage_preference else None
            data["usage_preference_name"] = val.usage_preference.name if val.usage_preference else "-"
            data["usage_preference_pattern"] = val.usage_preference.pattern if val.usage_preference else val.usage_preference_pattern

            data["tag"] = [
                {"id": tag.tag.id, "name": tag.tag.name}
                for tag in val.tag.all()
            ]

            for i in range(1,11):
                extra_data_field = f"extra_data_{i}"
                data[extra_data_field] = getattr(val,extra_data_field,None)

            return_data.append(data)

        return {
            "total": total,
            "page": page,
            "data": return_data,
        }