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"""
Credits Router - API endpoints for credit management.
Provides endpoints for checking credit balance and viewing credit history.
"""
from fastapi import APIRouter, Depends, Query, Request
from pydantic import BaseModel
from typing import List, Optional
from datetime import datetime
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select, desc
from core.database import get_db
from core.models import User, GeminiJob
router = APIRouter(prefix="/credits", tags=["credits"])
# Response Models
class CreditBalanceResponse(BaseModel):
"""Response for credit balance endpoint."""
user_id: str
credits: int
last_used_at: Optional[str] = None
class CreditHistoryItem(BaseModel):
"""Single item in credit history."""
job_id: str
job_type: str
status: str
credits_reserved: int
credits_refunded: bool
error_message: Optional[str] = None
created_at: str
completed_at: Optional[str] = None
class CreditHistoryResponse(BaseModel):
"""Response for credit history endpoint."""
user_id: str
current_balance: int
history: List[CreditHistoryItem]
total_count: int
page: int
limit: int
@router.get("/balance", response_model=CreditBalanceResponse)
async def get_credits(
request: Request
):
"""
Get current credit balance.
Returns the user's current credit balance and last usage time.
Auth is handled by AuthMiddleware - user is in request.state.user
"""
user = request.state.user
return CreditBalanceResponse(
user_id=user.user_id,
credits=user.credits,
last_used_at=user.last_used_at.isoformat() if user.last_used_at else None
)
@router.get("/history", response_model=CreditHistoryResponse)
async def get_credit_history(
request: Request,
db: AsyncSession = Depends(get_db),
page: int = Query(1, ge=1, description="Page number"),
limit: int = Query(20, ge=1, le=100, description="Items per page")
):
"""
Get credit usage history.
Returns a paginated list of jobs with credit transactions,
showing which jobs used credits and which were refunded.
Only includes jobs where credits were reserved (credits_reserved > 0).
Auth is handled by AuthMiddleware - user is in request.state.user
"""
user = request.state.user
offset = (page - 1) * limit
# Query jobs with credit transactions
query = select(GeminiJob).where(
GeminiJob.user_id == user.user_id,
GeminiJob.credits_reserved > 0 # Only jobs that had credits reserved
).order_by(desc(GeminiJob.created_at)).offset(offset).limit(limit)
result = await db.execute(query)
jobs = result.scalars().all()
# Get total count
count_query = select(GeminiJob).where(
GeminiJob.user_id == user.user_id,
GeminiJob.credits_reserved > 0
)
count_result = await db.execute(count_query)
total_count = len(count_result.scalars().all())
# Build history items
history = []
for job in jobs:
history.append(CreditHistoryItem(
job_id=job.job_id,
job_type=job.job_type,
status=job.status,
credits_reserved=job.credits_reserved,
credits_refunded=job.credits_refunded or False,
error_message=job.error_message,
created_at=job.created_at.isoformat() if job.created_at else None,
completed_at=job.completed_at.isoformat() if job.completed_at else None
))
return CreditHistoryResponse(
user_id=user.user_id,
current_balance=user.credits,
history=history,
total_count=total_count,
page=page,
limit=limit
)
# =============================================================================
# New Transaction History Endpoints
# =============================================================================
class CreditTransactionItem(BaseModel):
"""Single credit transaction record."""
transaction_id: str
transaction_type: str # reserve, refund, confirm, purchase
amount: int
balance_before: int
balance_after: int
source: str
reference_type: Optional[str] = None
reference_id: Optional[str] = None
request_path: Optional[str] = None
request_method: Optional[str] = None
response_status: Optional[int] = None
reason: Optional[str] = None
created_at: str
class TransactionHistoryResponse(BaseModel):
"""Response for transaction history endpoint."""
user_id: str
current_balance: int
transactions: List[CreditTransactionItem]
total_count: int
page: int
limit: int
@router.get("/transactions", response_model=TransactionHistoryResponse)
async def get_transaction_history(
request: Request,
db: AsyncSession = Depends(get_db),
transaction_type: Optional[str] = Query(None, description="Filter by type (reserve, refund, confirm, purchase)"),
page: int = Query(1, ge=1, description="Page number"),
limit: int = Query(50, ge=1, le=100, description="Items per page")
):
"""
Get detailed credit transaction history.
Returns complete audit trail of all credit operations including:
- Reservations (when credits were deducted for API calls)
- Refunds (when credits were returned due to failures)
- Confirmations (when credits were confirmed as used)
- Purchases (when credits were added via payments)
Auth is handled by AuthMiddleware - user is in request.state.user
"""
from core.models import CreditTransaction
from sqlalchemy import func
user = request.state.user
offset = (page - 1) * limit
# Build query
query = select(CreditTransaction).where(
CreditTransaction.user_id == user.id
)
if transaction_type:
query = query.where(CreditTransaction.transaction_type == transaction_type)
query = query.order_by(desc(CreditTransaction.created_at)).offset(offset).limit(limit)
# Execute query
result = await db.execute(query)
transactions = result.scalars().all()
# Get total count
count_query = select(func.count(CreditTransaction.id)).where(
CreditTransaction.user_id == user.id
)
if transaction_type:
count_query = count_query.where(CreditTransaction.transaction_type == transaction_type)
count_result = await db.execute(count_query)
total_count = count_result.scalar() or 0
# Build response
transaction_items = []
for tx in transactions:
transaction_items.append(CreditTransactionItem(
transaction_id=tx.transaction_id,
transaction_type=tx.transaction_type,
amount=tx.amount,
balance_before=tx.balance_before,
balance_after=tx.balance_after,
source=tx.source,
reference_type=tx.reference_type,
reference_id=tx.reference_id,
request_path=tx.request_path,
request_method=tx.request_method,
response_status=tx.response_status,
reason=tx.reason,
created_at=tx.created_at.isoformat() if tx.created_at else None
))
return TransactionHistoryResponse(
user_id=user.user_id,
current_balance=user.credits,
transactions=transaction_items,
total_count=total_count,
page=page,
limit=limit
)
class BalanceVerificationResponse(BaseModel):
"""Response for balance verification endpoint."""
user_id: str
current_balance: int
calculated_balance: int
is_valid: bool
discrepancy: int
last_transaction_at: Optional[str] = None
@router.get("/balance/verify", response_model=BalanceVerificationResponse)
async def verify_balance(
request: Request,
db: AsyncSession = Depends(get_db)
):
"""
Verify user balance against transaction history.
Calculates balance from all transactions and compares with stored balance.
Useful for debugging credit discrepancies.
Auth is handled by AuthMiddleware - user is in request.state.user
"""
from core.models import CreditTransaction
from sqlalchemy import func
user = request.state.user
# Calculate balance from transactions
result = await db.execute(
select(func.sum(CreditTransaction.amount)).where(
CreditTransaction.user_id == user.id
)
)
calculated_balance = result.scalar() or 0
# Get last transaction time
last_tx_result = await db.execute(
select(CreditTransaction).where(
CreditTransaction.user_id == user.id
).order_by(desc(CreditTransaction.created_at)).limit(1)
)
last_tx = last_tx_result.scalar_one_or_none()
is_valid = (calculated_balance == user.credits)
discrepancy = user.credits - calculated_balance
return BalanceVerificationResponse(
user_id=user.user_id,
current_balance=user.credits,
calculated_balance=calculated_balance,
is_valid=is_valid,
discrepancy=discrepancy,
last_transaction_at=last_tx.created_at.isoformat() if last_tx and last_tx.created_at else None
)
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