from rest_framework import status
from rest_framework.exceptions import ValidationError

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


class SuitabilityUpdate(AdminApiBase):
    def validate_request(self, request):
        data = request.data.copy()
        if "description" in data and "desc" not in data:
            data["desc"] = data.get("description")
        if "department" in data and "department_id" not in data:
            data["department_id"] = data.get("department")
        # if "tag_id" in data and "tag" not in data:
        #     data["tag"] = data.get("tag_id")

        status_code_string = ",".join(str(v) for v in EsSuitability.STATUS_TO_CODE.values())

        rules = {
            "id": "required|array|exists:api.EsSuitability,id",
        }

        attribute = {}

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

        edit_suitability = (
            EsSuitability.objects
            .select_related("department")
            .prefetch_related(
                "invigilator",
                "location",
                "tag__tag"
            )
            .filter(id__in=data.get("id"))
        )

        rules = {
            "name": "nullable",
            "desc": "nullable",
            "department_id": "nullable|exists:api.EsDepartment,id",
            "status": "nullable|in:" + status_code_string,
            "invigilator_id": "nullable|array|exists:api.EsInvigilator,id",
            "location_id": "nullable|array|exists:api.EsLocation,id",
            "tag_id": "nullable|array|exists:api.EsTag,id",
            "tag": "nullable|array|exists:api.EsTag,id",
        }

        if request.data.get("code") and edit_suitability.count() == 1:
            suitability = edit_suitability.first()
            if request.data.get("code") != suitability.code:
                rules["code"] = "nullable|not_exists:api.EsSuitability,code"

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

        return edit_suitability

    def post(self, request):
        try:
            edit_suitability = self.validate_request(request)
            data = request.data.copy()
            if "description" in data and "desc" not in data:
                data["desc"] = data.get("description")
            if "department" in data and "department_id" not in data:
                data["department_id"] = data.get("department")
            if "tag_id" in data and "tag" not in data:
                data["tag"] = data.get("tag_id")

            action = "suitability_update"
            updated = False
            update_fields = {}
            ignore_fields = ["id", "invigilator_id", "location_id", "tag_id", "tag", "timestamp", "signature"]
            if edit_suitability.count() > 1 or not data.get("code"):
                ignore_fields.append("code")
            valid_fields = {f.column for f in EsSuitability._meta.fields}
            for key, val in data.items():
                if key not in ignore_fields and key in valid_fields:
                    updated = True
                    update_fields[key] = val

            old_new_data = get_multiple_old_new_data(edit_suitability, data.items(), ignore_fields, valid_fields)
            if update_fields:
                update_fields["updated_by"] = request.user.id
                edit_suitability.update(**update_fields)

            if "invigilator_id" in data:
                new_ids = data.get("invigilator_id", [])
                old_new_data = self.update_m2m_field_bulk(edit_suitability, "invigilator", new_ids, old_new_data)

            if "location_id" in data:
                new_ids = data.get("location_id", [])
                old_new_data = self.update_m2m_field_bulk(edit_suitability, "location", new_ids, old_new_data)

            if "tag" in data:
                new_ids = data.get("tag", [])
                old_new_data = self.update_m2m_field_bulk(edit_suitability, "tag", new_ids, old_new_data, False, True)

            if old_new_data["old_data"] or old_new_data["new_data"]:

                audit_trail = AuditTrail.objects.create(
                    user_id=request.user.id,
                    type=self.audit_type,
                    ip_address=get_ip(request)
                )

                code = ",".join(edit_suitability.values_list("code", flat=True))
                remark_param = {
                    "code": code
                }

                AuditTrailDetails.custom_insert(
                    audit_trail=audit_trail,
                    action=action,
                    remark_param=remark_param,
                    new_data=old_new_data["new_data"],
                    old_data=old_new_data["old_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)