feat: purchases added

src/usecase/purchase/create_purchase.py

@@ -0,0 +1,83 @@
+import logging
+import uuid
+from typing import TYPE_CHECKING
+
+from src import domain, dto
+
+if TYPE_CHECKING:
+    from .. import Usecase
+
+log = logging.getLogger(__name__)
+
+
+async def create_purchase(self: 'Usecase', input: dto.CreatePurchaseInput, user_id: uuid.UUID) -> dto.PurchaseOutput:
+    async with self.database.transaction():
+        # Проверяем существование целевого канала
+        target_channel = await self.database.get_target_channel(user_id, channel_id=input.target_channel_id)
+        if not target_channel:
+            log.warning(
+                'User %s attempted to create purchase for unavailable target %s', user_id, input.target_channel_id
+            )
+            raise domain.TargetChannelNotFound(input.target_channel_id)
+
+        # Проверяем существование внешнего канала
+        external_channel = await self.database.get_external_channel(user_id, channel_id=input.external_channel_id)
+        if not external_channel:
+            log.warning(
+                'User %s attempted to create purchase for unavailable external %s', user_id, input.external_channel_id
+            )
+            raise domain.ExternalChannelNotFound(input.external_channel_id)
+
+        # Проверяем существование креатива
+        creative = await self.database.get_creative(user_id, input.creative_id)
+        if not creative:
+            log.warning('User %s attempted to create purchase for unavailable creative %s', user_id, input.creative_id)
+            raise domain.CreativeNotFound(input.creative_id)
+
+        # Создаём уникальную пригласительную ссылку через Telegram Bot API
+        requires_approval = input.invite_link_type == domain.InviteLinkType.APPROVAL
+        invite_link = await self.telegram_writer.create_chat_invite_link(
+            chat_id=target_channel.telegram_id,
+            requires_approval=requires_approval,
+        )
+
+        # Создаём закуп
+        purchase = domain.Purchase(
+            target_channel_id=input.target_channel_id,
+            external_channel_id=input.external_channel_id,
+            creative_id=input.creative_id,
+            user_id=user_id,
+            placement_date=input.placement_date,
+            cost=input.cost,
+            comment=input.comment,
+            ad_post_url=input.ad_post_url,
+            invite_link_type=input.invite_link_type,
+            invite_link=invite_link,
+            status=domain.PurchaseStatus.ACTIVE,
+        )
+
+        created = await self.database.create_purchase(purchase)
+
+        # Увеличиваем счётчик закупов у креатива
+        creative.purchases_count += 1
+        await self.database.update_creative(creative)
+
+    return dto.PurchaseOutput(
+        id=created.id,
+        target_channel_id=created.target_channel_id,
+        target_channel_title=created.target_channel.title,
+        external_channel_id=created.external_channel_id,
+        external_channel_title=created.external_channel.title,
+        creative_id=created.creative_id,
+        creative_name=created.creative.name,
+        placement_date=created.placement_date,
+        cost=created.cost,
+        comment=created.comment,
+        ad_post_url=created.ad_post_url,
+        invite_link_type=created.invite_link_type,
+        invite_link=created.invite_link,
+        status=created.status,
+        subscriptions_count=created.subscriptions_count,
+        views_count=created.views_count,
+        created_at=created.created_at,
+    )