Add support for --latest option in import_chzzk_campaign management command

chzzk/management/commands/import_chzzk_campaign.py

@@ -5,20 +5,20 @@ if TYPE_CHECKING:
     import argparse
 
     from chzzk.schemas import ChzzkCampaignV2
+    from chzzk.schemas import ChzzkRewardV2
 
 
-from typing import TYPE_CHECKING
-
 import requests
 from django.core.management.base import BaseCommand
+from django.core.management.base import CommandError
 from django.utils import timezone
 
 from chzzk.models import ChzzkCampaign
 from chzzk.models import ChzzkReward
 from chzzk.schemas import ChzzkApiResponseV2
 
-if TYPE_CHECKING:
-    import argparse
+MAX_CAMPAIGN_OUTLIER_THRESHOLD: int = 100_000_000
+MAX_CAMPAIGN_OUTLIER_GAP: int = 1_000
 
 CHZZK_API_URLS: list[tuple[str, str]] = [
     ("v1", "https://api.chzzk.naver.com/service/v1/drops/campaigns/{campaign_no}"),
@@ -37,11 +37,114 @@ class Command(BaseCommand):
 
     def add_arguments(self, parser: argparse.ArgumentParser) -> None:
         """Add command-line arguments for the management command."""
-        parser.add_argument("campaign_no", type=int, help="Campaign number to fetch")
+        parser.add_argument(
+            "campaign_no",
+            nargs="?",
+            type=int,
+            help="Campaign number to fetch (required unless --latest is used)",
+        )
+        parser.add_argument(
+            "--latest",
+            action="store_true",
+            help=(
+                "Fetches the highest existing campaign_no and imports "
+                "missing IDs from latest-5..latest-1 plus latest+1..latest+5."
+            ),
+        )
 
     def handle(self, **options) -> None:
-        """Main handler for the management command. Fetches campaign data from both API versions, validates, and stores them."""
-        campaign_no: int = int(options["campaign_no"])
+        """Main handler for the management command.
+
+        Raises:
+            CommandError: If campaign_no is missing when --latest is not used.
+        """
+        latest: bool = bool(options.get("latest"))
+        campaign_no: int | None = options.get("campaign_no")
+
+        if latest:
+            to_import: list[int] = self.get_campaign_import_candidates()
+
+            if not to_import:
+                msg: str = "Nothing to import with --latest at this time."
+                self.stdout.write(self.style.SUCCESS(msg))
+                return
+
+            for target_no in to_import:
+                self.stdout.write(f"Importing campaign {target_no}...")
+                self._import_campaign(target_no)
+
+            self.stdout.write(self.style.SUCCESS("--latest import completed."))
+            return
+
+        if campaign_no is None:
+            err_msg: str = "campaign_no is required unless --latest is used"
+            raise CommandError(err_msg)
+
+        self._import_campaign(int(campaign_no))
+
+    def get_campaign_import_candidates(self) -> list[int]:
+        """Determine which campaign numbers to import when --latest is used.
+
+        Returns:
+            list[int]: A list of campaign numbers that should be imported.
+        """
+        # Handle potential outliers by checking the top two campaign IDs.
+        campaign_ids = list(
+            ChzzkCampaign.objects.order_by("-campaign_no").values_list(
+                "campaign_no",
+                flat=True,
+            )[:2],
+        )
+
+        max_campaign_no: int = campaign_ids[0] if campaign_ids else 0
+        second_max_campaign_no: int = campaign_ids[1] if len(campaign_ids) > 1 else 0
+
+        if (
+            max_campaign_no > MAX_CAMPAIGN_OUTLIER_THRESHOLD
+            and max_campaign_no - second_max_campaign_no > MAX_CAMPAIGN_OUTLIER_GAP
+        ):
+            self.stdout.write(
+                self.style.WARNING(
+                    f"Detected an outlier max campaign_no {max_campaign_no}; "
+                    f"using second max {second_max_campaign_no} instead.",
+                ),
+            )
+            max_campaign_no = second_max_campaign_no
+
+        msg: str = f"Max campaign_no in database: {max_campaign_no}"
+        self.stdout.write(self.style.SUCCESS(msg))
+
+        if max_campaign_no <= 0:
+            backfill_candidates: list[int] = []
+        else:
+            backfill_start: int = max(1, max_campaign_no - 5)
+            existing_lower_ids: set[int] = set(
+                ChzzkCampaign.objects.filter(
+                    campaign_no__gte=backfill_start,
+                    campaign_no__lt=max_campaign_no,
+                ).values_list("campaign_no", flat=True),
+            )
+            backfill_candidates: list[int] = [
+                idx
+                for idx in range(backfill_start, max_campaign_no)
+                if idx not in existing_lower_ids
+            ]
+
+        new_candidates: list[int] = list(
+            range(
+                max_campaign_no + 1,
+                max_campaign_no + 6,
+            ),
+        )
+        to_import: list[int] = backfill_candidates + new_candidates
+        return to_import
+
+    def _import_campaign(self, campaign_no: int) -> None:
+        """Import a single campaign by its campaign number.
+
+        Args:
+            campaign_no (int): The campaign number to import.
+        """
         api_version: str = "v2"  # TODO(TheLovinator): Add support for v1 API  # noqa: TD003
         url: str = f"https://api.chzzk.naver.com/service/{api_version}/drops/campaigns/{campaign_no}"
         resp: requests.Response = requests.get(
@@ -52,66 +155,49 @@ class Command(BaseCommand):
                 "User-Agent": USER_AGENT,
             },
         )
+
         try:
             resp.raise_for_status()
         except requests.HTTPError as e:
             json_msg: str = ""
             if resp.headers.get("Content-Type", "").startswith("application/json"):
-                error_data = resp.json()
+                error_data: dict[str, Any] = resp.json()
                 json_msg = error_data.get("message", "")
 
             msg: str = f"Failed to fetch campaign {campaign_no}: {e} - {json_msg}"
             self.stdout.write(self.style.ERROR(msg))
             return
+
         data: dict[str, Any] = resp.json()
+        cd: ChzzkCampaignV2 = ChzzkApiResponseV2.model_validate(data).content
 
-        campaign_data: ChzzkCampaignV2
-        campaign_data = ChzzkApiResponseV2.model_validate(data).content
-
-        # Prepare raw JSON defaults for both API versions so DB inserts won't fail
-        raw_json_v1_val = data if api_version == "v1" else {}
-        raw_json_v2_val = data if api_version == "v2" else {}
-
-        # Save campaign
-        campaign_obj, created = ChzzkCampaign.objects.update_or_create(
-            campaign_no=campaign_data.campaign_no,
-            defaults={
-                "title": campaign_data.title,
-                "image_url": campaign_data.image_url,
-                "description": campaign_data.description,
-                "category_type": campaign_data.category_type,
-                "category_id": campaign_data.category_id,
-                "category_value": campaign_data.category_value,
-                "pc_link_url": campaign_data.pc_link_url,
-                "mobile_link_url": campaign_data.mobile_link_url,
-                "service_id": campaign_data.service_id,
-                "state": campaign_data.state,
-                "start_date": campaign_data.start_date,
-                "end_date": campaign_data.end_date,
-                "has_ios_based_reward": campaign_data.has_ios_based_reward,
-                "drops_campaign_not_started": campaign_data.drops_campaign_not_started,
-                "campaign_reward_type": getattr(
-                    campaign_data,
-                    "campaign_reward_type",
-                    "",
-                ),
-                "reward_type": getattr(campaign_data, "reward_type", ""),
-                "account_link_url": campaign_data.account_link_url,
-                "scraped_at": timezone.now(),
-                "scrape_status": "success",
-                "raw_json_v1": raw_json_v1_val,
-                "raw_json_v2": raw_json_v2_val,
-            },
+        campaign_obj: ChzzkCampaign = self.import_campaign_data(
+            campaign_no=campaign_no,
+            api_version=api_version,
+            data=data,
+            cd=cd,
         )
-        if created:
-            self.stdout.write(
-                self.style.SUCCESS(f"Created campaign {campaign_no}"),
-            )
-        for reward in campaign_data.reward_list:
-            reward_, created = ChzzkReward.objects.update_or_create(
-                campaign=campaign_obj,
-                reward_no=reward.reward_no,
-                defaults={
+
+        cd_reward_list: list[ChzzkRewardV2] = cd.reward_list
+        for reward in cd_reward_list:
+            self.update_or_create_reward(campaign_no, campaign_obj, reward)
+
+        self.stdout.write(self.style.SUCCESS(f"Imported campaign {campaign_no}"))
+
+    def update_or_create_reward(
+        self,
+        campaign_no: int,
+        campaign_obj: ChzzkCampaign,
+        reward: ChzzkRewardV2,
+    ) -> None:
+        """Update or create a reward for a given campaign.
+
+        Args:
+            campaign_no (int): The campaign number the reward belongs to.
+            campaign_obj (ChzzkCampaign): The campaign database object the reward belongs to.
+            reward (ChzzkRewardV2): The reward data parsed from the API response.
+        """
+        reward_defaults: dict[str, Any] = {
             "image_url": reward.image_url,
             "title": reward.title,
             "reward_type": reward.reward_type,
@@ -124,15 +210,111 @@ class Command(BaseCommand):
             "condition_for_minutes": reward.condition_for_minutes,
             "ios_based_reward": reward.ios_based_reward,
             "code_remaining_count": reward.code_remaining_count,
-                },
-            )
-            if created:
-                self.stdout.write(
-                    self.style.SUCCESS(
-                        f"  Created reward {reward_.reward_no} for campaign {campaign_no}",
-                    ),
+        }
+
+        reward_, created = ChzzkReward.objects.get_or_create(
+            campaign=campaign_obj,
+            reward_no=reward.reward_no,
+            defaults=reward_defaults,
         )
 
-        self.stdout.write(
-            self.style.SUCCESS(f"Imported campaign {campaign_no}"),
+        if created:
+            msg: str = f"Created reward {reward_.reward_no} for campaign {campaign_no}"
+            self.stdout.write(self.style.SUCCESS(msg))
+            return
+
+        updated_reward: bool = self._apply_updates_if_changed(reward_, reward_defaults)
+        if updated_reward:
+            msg: str = f"  Updated reward {reward_.reward_no} for campaign {campaign_no} (changes detected)"
+            self.stdout.write(self.style.SUCCESS(msg))
+
+    def _apply_updates_if_changed(
+        self,
+        instance: ChzzkCampaign | ChzzkReward,
+        changes: dict[str, Any],
+    ) -> bool:
+        """Update a model instance only if values have changed.
+
+        Returns:
+            bool: True if an update occurred, False if no changes were needed.
+        """
+        fields_to_update: list[str] = []
+
+        for field_name, new_value in changes.items():
+            if getattr(instance, field_name) != new_value:
+                setattr(instance, field_name, new_value)
+                fields_to_update.append(field_name)
+
+        if fields_to_update:
+            instance.save(update_fields=fields_to_update)
+            return True
+
+        return False
+
+    def import_campaign_data(
+        self,
+        campaign_no: int,
+        api_version: str,
+        data: dict[str, Any],
+        cd: ChzzkCampaignV2,
+    ) -> ChzzkCampaign:
+        """Import campaign data into the database.
+
+        Args:
+            campaign_no (int): The campaign number being imported.
+            api_version (str): The API version used to fetch the data ("v1" or "v2").
+            data (dict[str, Any]): The raw JSON data returned from the API.
+            cd (ChzzkCampaignV2): The parsed campaign data from the API response.
+
+        Returns:
+            ChzzkCampaign: The imported or updated campaign database object.
+        """
+        raw_json_v1_val: dict[str, Any] = data if api_version == "v1" else {}
+        raw_json_v2_val: dict[str, Any] = data if api_version == "v2" else {}
+
+        defaults: dict[str, Any] = {
+            "title": cd.title,
+            "image_url": cd.image_url,
+            "description": cd.description,
+            "category_type": cd.category_type,
+            "category_id": cd.category_id,
+            "category_value": cd.category_value,
+            "pc_link_url": cd.pc_link_url,
+            "mobile_link_url": cd.mobile_link_url,
+            "service_id": cd.service_id,
+            "state": cd.state,
+            "start_date": cd.start_date,
+            "end_date": cd.end_date,
+            "has_ios_based_reward": cd.has_ios_based_reward,
+            "drops_campaign_not_started": cd.drops_campaign_not_started,
+            "campaign_reward_type": getattr(cd, "campaign_reward_type", ""),
+            "reward_type": getattr(cd, "reward_type", ""),
+            "account_link_url": cd.account_link_url,
+            "raw_json_v1": raw_json_v1_val,
+            "raw_json_v2": raw_json_v2_val,
+        }
+
+        campaign_obj, created = ChzzkCampaign.objects.get_or_create(
+            campaign_no=cd.campaign_no,
+            defaults={
+                **defaults,
+                "scraped_at": timezone.now(),
+                "scrape_status": "success",
+            },
         )
+
+        if created:
+            msg: str = f"Created campaign {campaign_no}"
+            self.stdout.write(self.style.SUCCESS(msg))
+            return campaign_obj
+
+        updated: bool = self._apply_updates_if_changed(campaign_obj, defaults)
+
+        if updated:
+            campaign_obj.scraped_at = timezone.now()
+            campaign_obj.scrape_status = "success"
+            campaign_obj.save(update_fields=["scraped_at", "scrape_status"])
+            msg: str = f"Updated campaign {campaign_no} (changes detected)"
+            self.stdout.write(self.style.SUCCESS(msg))
+
+        return campaign_obj