import datetime
from collections import defaultdict

from django.db.models import Prefetch
from rest_framework import serializers, status

from api.models import TtSetting, TtWeekPattern, TtAvailability, TtStartPreference, \
    TtUsagePreference, TtActivityTemplate, TtActivity, TtAcademicTerm, TtWeek
from api.models.audit_trail import AuditTrail
from api.models.audit_trail_details import AuditTrailDetails
from api.views.admin.base import AdminApiBase
from api.validator import BaseValidator
from api.utils import decrypt_aes_128_cbc, encrypt_aes_128_cbc, generate_kafka_data_update, log_critical_error, get_exception_detail, \
    get_add_new_data, get_ip, get_old_new_data, bulk_sync_to_redis, get_multiple_old_new_data, search_old_new_data, \
    time_to_slot, convert_to_redis_week
from rest_framework.exceptions import ValidationError
from api.translation import __
from backend.kafka import send_request
from backend.redis_client import redis_client


class ActivityUpdate(AdminApiBase):
    def validate_request(self,request):
        # wont update module id, just want based on module id get the activity template
        rules = {
            "id": "required|exists:api.TtActivity,id",
            # "module_id": "required|exists:api.TtModule,id",
        }
        # if need rename field, can put here
        attribute = {
            # "email": __("attr.email"),
        }
        # validate id first, cause need get activity by id, if wrong id direct return error
        validator = BaseValidator(request.data,rules,attribute)
        error = validator.validate()
        if error:
            raise ValidationError(error)

        edit_activity = (
            TtActivity.objects
            .select_related("activity_template", "department", "academic_term", "week_pattern","module", "activity_type", "zone", "availability","start_preference", "usage_preference")
            .prefetch_related(
                "week",
                "tag__tag"
                # tags means the relation add in models, __tag means the relation table tag_id get the tag object #2
            )
            .filter(id__in=request.data.get("id"))
        )

        setting_params = {
            "slot_per_week",
        }
        settings = TtSetting.get_multiple_setting(setting_params)
        slot_per_week = settings["slot_per_week"]
        scheduled_activity_update_column = [
            "name",
            "desc",
            "department_id",
            "zone_id",
            "tag",
            "code",
            "extra_data_1",
            "extra_data_2",
            "extra_data_3",
            "extra_data_4",
            "extra_data_5",
            "extra_data_6",
            "extra_data_7",
            "extra_data_8",
            "extra_data_9",
            "extra_data_10",
        ]
        rules = {
            "name": "nullable",
            "desc": "nullable",
            "duration": "nullable",
            "planned_size": "nullable",
            "department_id": "nullable|exists:api.TtDepartment,id",
            "zone_id": "nullable|exists:api.TtZone,id",
            "sequence_number": "nullable|integer",
            "suggested_day": "nullable",
            "suggested_time": "nullable",
            "week_pattern_id": "nullable|exists:api.TtWeekPattern,id",
            "week_pattern": "nullable|array|exists:api.TtWeek,id",
            "availability_id": "nullable|exists:api.TtAvailability,id",
            "availability_pattern": "nullable|char_count:" + slot_per_week + "|regex:[01]+",
            "start_preference_id": "nullable|exists:api.TtStartPreference,id",
            "start_preference_pattern": "nullable|char_count:" + slot_per_week + "|regex:[1-9]+",
            "usage_preference_id": "nullable|exists:api.TtUsagePreference,id",
            "usage_preference_pattern": "nullable|char_count:" + slot_per_week + "|regex:[1-9]+",
            "tag": "nullable|array|exists:api.TtTag,id",
        }

        if request.data.get("code") and edit_activity.count() == 1:
            activity = edit_activity.first()
            if request.data.get("code") != activity.code:
                rules['code'] = "nullable|not_exists:api.TtActivity,code"

        # 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)
        # variant activity not allow update week pattern
        for activity in edit_activity:
            if activity.is_variant:
                if "week_pattern_id" in request.data or "week_pattern" in request.data:
                    raise ValidationError({
                        "error": __('validation.variant_activity_now_allow_update_week'),
                        "errors": {"week_pattern": __("validation.variant_activity_now_allow_update_week")}
                    })
            if activity.scheduled:
                for key, val in request.data.items():
                    if key not in scheduled_activity_update_column and key not in ["id","signature","timestamp"]:
                        raise ValidationError({
                            "error": __('validation.scheduled_activity_not_allow_update_column'),
                            "errors": {key: __("validation.scheduled_activity_not_allow_update_column")}
                        })
        return edit_activity

    def post(self, request):
        # Validate input
        try:
            edit_activity = self.validate_request(request)
            setting_params = {
                "minute_per_slot",
            }
            settings = TtSetting.get_multiple_setting(setting_params)
            minute_per_slot = int(settings["minute_per_slot"])
            first_activity = edit_activity.first()

            academic_term_id = first_activity.academic_term_id
            academic_term = TtAcademicTerm.objects.filter(id=academic_term_id).prefetch_related(Prefetch("week", queryset=TtWeek.objects.order_by("week"))).first()

            default_availability_pattern = academic_term.default_availability
            default_start_preference_pattern = academic_term.default_start
            default_usage_preference_pattern = academic_term.default_usage

            default_week_pattern = [w.id for w in academic_term.week.all()]
            week_pattern_for_redis = convert_to_redis_week(list([w.week for w in academic_term.week.all()]))

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

            # this 3 pattern if got give id, force pattern to null
            availability_id = request.data.get("availability_id")
            availability_pattern = request.data.get("availability_pattern")
            if availability_id:
                availability_pattern = None

            start_preference_id = request.data.get("start_preference_id")
            start_preference_pattern = request.data.get("start_preference_pattern")
            if start_preference_id:
                start_preference_pattern = None

            usage_preference_id = request.data.get("usage_preference_id")
            usage_preference_pattern = request.data.get("usage_preference_pattern")
            if usage_preference_id:
                usage_preference_pattern = None

            updated = False
            update_fields = {}
            # not allow update academic_term, so even FE got give also ignore
            ignore_fields = ['id',"module_id","activity_type",'academic_term_id','tag','timestamp','signature']
            # if more than 1 activity edit, ignore code
            if edit_activity.count() > 1 or not request.data.get("code"):
                ignore_fields.append('code')
            valid_fields = {f.column for f in TtActivity._meta.fields}
            
            # suggested_time_slot just used to store data in redis
            suggested_time_slot = None
            for key, val in request.data.items():
                if key not in ignore_fields and key in valid_fields:
                    updated = True
                    match key:
                        case "availability_pattern" | "start_preference_pattern" | "usage_preference_pattern":
                            # got extra handle the value for these key, so the param same name as the key, so can using this code to handle
                            update_fields[key] = locals()[key]
                        case "suggested_time":
                            if val:
                                suggested_time = datetime.datetime.strptime(request.data["suggested_time"], "%H:%M")
                                suggested_time_slot = time_to_slot(suggested_time, minute_per_slot)
                                update_fields['suggested_time_slot'] = suggested_time_slot
                                update_fields[key] = val
                        case "duration":
                            update_fields[key] = val
                            if val != 0:
                                update_fields['slot_required'] = val // minute_per_slot
                            else:
                                update_fields['slot_required'] = 0
                        case _:
                            # default the key will same as db column name
                            update_fields[key] = val

            # if FE got pass in either 1 param, will start do checking based on pass in data need update to default pattern or not
            # if both is None/0/"", means will update to default pattern
            if "availability_id" in request.data or "availability_pattern" in request.data:
                if not availability_id and not availability_pattern:
                    availability_pattern = default_availability_pattern
                    update_fields['availability_pattern'] = availability_pattern
            if "start_preference_id" in request.data or "start_preference_pattern" in request.data:
                if not start_preference_id and not start_preference_pattern:
                    start_preference_pattern = default_start_preference_pattern
                    update_fields['start_preference_pattern'] = start_preference_pattern
            if "usage_preference_id" in request.data or "usage_preference_pattern" in request.data:
                if not usage_preference_id and not usage_preference_pattern:
                    usage_preference_pattern = default_usage_preference_pattern
                    update_fields['usage_preference_pattern'] = usage_preference_pattern
            # be4 save need get the old new data already, because bulk update is no matter got change or no changes also will update
            old_new_data = get_multiple_old_new_data(edit_activity,request.data.items(),ignore_fields,valid_fields)
            if update_fields: # 2026-04-27, ignore updated param, it is useless, this code is replace by "replace in file", so didnt remove param updated
                update_fields['updated_by'] = request.user.id
                edit_activity.update(**update_fields)

            # custom week pattern store in relation, so need handle like this
            # if both not passing in, will not touch this, if got pass in [] or "", will handle also
            week_pattern_id = request.data.get("week_pattern_id")
            week_pattern = request.data.get("week_pattern")
            if "week_pattern" in request.data or "week_pattern_id" in request.data:
                # if is None, put in the default week_pattern first, so if got id, will reset to null, if no id, will update to default week_pattern
                if not week_pattern:
                    week_pattern = default_week_pattern
                else:
                    # if not empty of week_pattern, will get this data for update redis
                    # week store in redis need - 1, cause schedule there week is start from 0
                    week_pattern_for_redis = convert_to_redis_week(list(TtWeek.objects.filter(id__in=week_pattern).values_list("week",flat=True)))

                if week_pattern_id:
                    week_pattern = None
                    week_pattern_for_redis = []
                old_new_data = self.update_m2m_field_bulk(edit_activity,'week',week_pattern,old_new_data)

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

            redis_data = {
                "update": {}
            }

            redis_activity_table = "activity"
            redis_activity_data = {}
            redis_activity_column = [
                "name", "desc", "planned_size", "real_size", "activity_type_id", "duration","suggested_day","suggested_time_slot","suggested_time",
                "department_id", "sequence_number","module_id", "academic_term_id",
                "activity_template_id", "week_pattern_id", "week_pattern", "availability_id", "availability_pattern","start_preference_id",
                "start_preference_pattern", "usage_preference_id", "usage_preference_pattern",
                "staff_preset", "staff_suitability_id", "location_preset", "location_suitability_id", "status"
            ]

            # if only 1 activity, can edit code
            if edit_activity.count() == 1:
                redis_activity_column.append('code')

            # got new data only means got update, then will for loop request.data, cause the old_new_data['new_data'] for foreign key name, like department_id, will return in department, so cant use it
            if old_new_data['new_data']:
                for edit_id in request.data.get("id"):
                    # every new activity reset the redis_activity_data and append to redis_data['update']
                    redis_activity_data = {"id": edit_id}
                    for key, val in request.data.items():
                        if key in redis_activity_column:
                            if key in ["usage_preference_id","availability_id","start_preference_id","week_pattern_id"]:
                                # jose request if no id, dun store null, want to store "0"
                                redis_activity_data[key] = 0 if val in (None,"") else val
                            else:
                                redis_activity_data[key] = val
                        # extra handle for update slot_required
                        if key == "duration":
                            redis_activity_data['slot_required'] = int(val / minute_per_slot)
                    # this must custom the handle, for pattern, if not in some scenario will store null in redis when no id
                    if "availability_id" in request.data or "availability_pattern" in request.data:
                        redis_activity_data["availability_pattern"] = availability_pattern
                    if "start_preference_id" in request.data or "start_preference_pattern" in request.data:
                        redis_activity_data["start_preference_pattern"] = start_preference_pattern
                    if "usage_preference_id" in request.data or "usage_preference_pattern" in request.data:
                        redis_activity_data["usage_preference_pattern"] = usage_preference_pattern
                    if "week_pattern_id" in request.data or "week_pattern" in request.data:
                        redis_activity_data["week_pattern"] = week_pattern_for_redis
                    # if got update suggested time, need manual handle the suggested_time_slot update in redis
                    if "suggested_time" in request.data:
                        redis_activity_data["suggested_time_slot"] = suggested_time_slot
                    if len(redis_activity_data)>1:# > 1 means not only id
                        redis_data["update"].setdefault(redis_activity_table, []).append(redis_activity_data)

            bulk_sync_to_redis(redis_client, redis_data)

            if old_new_data['old_data'] or old_new_data['new_data']:
                #kafka update/ split by id
                kafka_activity = []
                method = "activity_update"
                kafka_topic = self.kafka_config['MICROSERVICES_TT_TOPIC']
                if kafka_topic:
                    new_data = old_new_data.get("new_data")
                    relation_fields = ["week", "tag"]
                    relation_data = generate_kafka_data_update(new_data, relation_fields)
                    update_fields.pop("updated_by", None)
                    for act in edit_activity:
                        data = {"id": act.id, **update_fields, **relation_data}
                        kafka_activity.append(data)
                    kafka_request_data = {
                        "session_id": request.user.name,
                        "activity": kafka_activity,
                    }
                    send_request(kafka_topic, kafka_request_data, None, method)

                # 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)
                )

                name = ",".join(edit_activity.values_list("name", flat=True))
                remark_param = {
                    "name":name
                }

                # 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'],
                    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)