from datetime import datetime
from rest_framework import status
from rest_framework.exceptions import ValidationError

from api.models import EsExamPeriod, EsExamPeriodUnavailability
from api.models.audit_trail import AuditTrail
from api.models.audit_trail_details import AuditTrailDetails
from api.translation import __
from api.utils import log_critical_error, get_exception_detail, get_add_new_data, get_ip
from api.validator import BaseValidator
from api.views.admin.base import AdminApiBase


def _parse_clock(value):
    for fmt in ("%H:%M:%S", "%H:%M"):
        try:
            return datetime.strptime(value, fmt).time()
        except (TypeError, ValueError):
            continue
    return None


class ExamPeriodCreate(AdminApiBase):
    def validate_request(self,request):
        status_code_string = ",".join(str(v) for v in EsExamPeriod.STATUS_TO_CODE.values())
        rules = {
            "code": "required|not_exists:api.EsExamPeriod,code",
            "name": "required",
            "start_date": "required|date",
            "end_date": "required|date",
            "start_time": "nullable|time",
            "end_time": "nullable|time",
            "unavailable_dates": "nullable|array",
            "status": "required|in:"+status_code_string,
        }

        # if need rename field, can put here
        attribute = {
            # "email": __("attr.email"),
        }

        validator = BaseValidator(request.data,rules,attribute)
        error = validator.validate()
        if error:
            raise ValidationError(error)

        start_date = datetime.strptime(request.data['start_date'], "%Y-%m-%d")
        end_date = datetime.strptime(request.data['end_date'], "%Y-%m-%d")

        if start_date > end_date:
            message = __("validation.gt.date", field=__("attr.end_date"), value=request.data['start_date'])
            raise ValidationError({
                'error': message,
                'errors': {
                    'end_date': message
                },
            })

        start_raw = request.data.get("start_time")
        end_raw = request.data.get("end_time")
        if start_raw and end_raw:
            start_time = _parse_clock(start_raw)
            end_time = _parse_clock(end_raw)
            if start_time > end_time:
                message = __("validation.gt.date", field=__("attr.end_time"), value=start_raw)
                raise ValidationError({
                    'error': message,
                    'errors': {
                        'end_time': message
                    },
                })

        unavailable_dates = request.data.get("unavailable_dates", [])
        if unavailable_dates:
            rules = {
                "unavailable_dates": "required|date",
            }

            for unavailable_date in unavailable_dates:
                validator = BaseValidator({
                    "unavailable_dates": unavailable_date
                }, rules, attribute)
                error = validator.validate()
                if error:
                    raise ValidationError(error)

                check_date = datetime.strptime(unavailable_date, "%Y-%m-%d")

                if check_date < start_date or check_date > end_date:
                    message = __("validation.between.date", field=__("attr.unavailable_date"), start=request.data['start_date'], end=request.data['end_date'])
                    raise ValidationError({
                        'error': message,
                        'errors': {
                            'unavailable_dates': message
                        },
                    })






    def post(self, request):
        # Validate input
        try:
            self.validate_request(request)

            old_new_data = {
                "new_data": None,
            }

            action="exam_period_create" # this is for audit log only

            idata = {}
            ignore_field = []
            valid_fields = {f.column for f in EsExamPeriod._meta.fields}

            for key, val in request.data.items():
                if key not in ignore_field:
                    match key:
                        case _:
                            if key in valid_fields:#for insert, key can check in default part, cause if got special handle, i can check the way to use key also
                                # default the key will same as db column name
                                idata[key] = val

            idata['created_by'] = request.user.id
            exam_period = EsExamPeriod.objects.create(**idata)

            old_new_data['new_data'] = get_add_new_data(exam_period)

            unavailable_dates = request.data.get("unavailable_dates", [])
            if unavailable_dates:
                EsExamPeriodUnavailability.bulk_insert(exam_period.id, unavailable_dates)
                old_new_data.setdefault("new_data", [])["unavailable_date"]= unavailable_dates

            # insert audit trail and details
            # can insert the parent first, then only insert details
            audit_trail = AuditTrail.objects.create(
                user_id=request.user.id,
                type=self.audit_type,
                ip_address=get_ip(request)
            )
            remark_param = {
                "code":exam_period.code,
            }

            # call to a function for insert details, so in future if want change to used worker, can modify in function only
            AuditTrailDetails.custom_insert(
                audit_trail=audit_trail,
                action=action,
                remark_param=remark_param,
                new_data=old_new_data['new_data'],
            )
            response = {

            }

            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)