import datetime
from collections import defaultdict

from rest_framework import serializers, status

from api.models import TtDepartment, TtZone, TtAvailability, TtStartPreference, TtUsagePreference, TtTag, TtSetting, \
    TtModule, TtAcademicTerm, TtActivityType, TtStaff, TtLocation, TtSuitability, TtActivityTemplate, TtWeekPattern, \
    TtWeek, TtPosModuleGroupModule, TtActivity
from api.views.admin.base import AdminApiBase
from api.validator import BaseValidator
from api.utils import decrypt_aes_128_cbc, encrypt_aes_128_cbc, log_critical_error, get_exception_detail, \
    calculate_preset_pattern_time, time_to_slot
from rest_framework.exceptions import ValidationError
from api.translation import __


class ResourcesUpdateRequirementRules(AdminApiBase):
    def validate_request(self,request):
        rules = {
            "academic_term_id": "required|exists:api.TtAcademicTerm,id",
            "activity_id": "nullable|array|exists:api.TtActivity,id",
        }
        # if need rename field, can put here
        attribute = {
            # "email": __("attr.email"),
        }
        # validate id first, cause need get activity_template by id, if wrong id direct return error
        validator = BaseValidator(request.data,rules,attribute)
        error = validator.validate()
        if error:
            raise ValidationError(error)
        # custom error after basic validation

        if error:
            raise ValidationError(error)

    def post(self, request):
        # Validate input
        try:
            self.api_log_skip_outgoing_data=True
            self.validate_request(request)
            academic_term_id = request.data.get("academic_term_id")
            academic_term = TtAcademicTerm.objects.filter(id=academic_term_id).prefetch_related("week").first()
            activity_ids = request.data.get("activity_id")
            activity_id = None
            if len(activity_ids) == 1:
                activity_id = activity_ids[0]
            data = {}
            data['delete_confirmation_api'] = False
            data["allow_remove"] = [
                "suggested_day",
                "suggested_time",
                "staff_preset",
                "staff_suitability",
                "location_preset",
                "location_suitability",
            ]
            setting_params = {
                "minute_per_slot",
            }
            data['based_setting'] = TtSetting.get_multiple_setting(setting_params)
            minute_per_slot = int(data["based_setting"]["minute_per_slot"])

            models = {
                "staff_preset": (TtStaff, ["id", "code", "name"]),
                "location_preset": (TtLocation, ["id", "code", "name"]),
            }

            for key, (model, fields) in models.items():
                data[key] = list(
                    model.objects.filter(status=model.STATUS_TO_CODE['active']).values(*fields)
                )

            data['staff_suitability'] = []
            data['location_suitability'] = []

            staff_suitability_ids = []
            location_suitability_ids = []
            # after selected suitability in template, if remove staff/location in suitability, when update again will cant show in the list to choose, so having this handle

            if activity_id:
                activity = TtActivity.objects.filter(id=activity_id).prefetch_related("staff_suitability", "location_suitability").first()
                staff_suitability_ids = [s.id for s in activity.staff_suitability.all()]
                location_suitability_ids = [l.id for l in activity.location_suitability.all()]

            suitabilities = TtSuitability.objects.filter(status=model.STATUS_TO_CODE['active']).prefetch_related("staff", "location").order_by(self.list_default_order_column).all()

            for suitability in suitabilities:
                if suitability.staff.exists() or suitability.id in staff_suitability_ids:
                    data['staff_suitability'].append({
                        "id": suitability.id,
                        "code": suitability.code,
                        "name": suitability.name,
                        "items": [{"id": s.id, "name": s.name} for s in suitability.staff.all()],
                    })

                if suitability.location.exists() or suitability.id in location_suitability_ids:
                    data['location_suitability'].append({
                        "id": suitability.id,
                        "code": suitability.code,
                        "name": suitability.name,
                        "items": [{"id": l.id, "name": l.name} for l in suitability.location.all()],
                    })
            data['suggested_time'] = []
            # Convert to datetime (use dummy date), cause time format not support timedelta to add minute
            today = datetime.date.today()
            suggested_time_start = datetime.datetime.combine(today, academic_term.start_time)
            suggested_time_end = datetime.datetime.combine(today, academic_term.end_time)

            delta = datetime.timedelta(minutes=minute_per_slot)
            while suggested_time_start <= suggested_time_end:
                data["suggested_time"].append({
                    "id": suggested_time_start.strftime('%H:%M'),
                    "name": suggested_time_start.strftime('%H:%M')
                })
                suggested_time_start += delta

            data['days'] = []
            for i in range(0,7):
                data['days'].append({
                    "id": i,
                    "name": __("attr.days_name."+str(i))
                })

            response = {
                "info": [],
                "rules": 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)