Complete CarPass product flows

app/api/parser.py

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+from decimal import Decimal
+
+from fastapi import APIRouter, Depends
+from pydantic import BaseModel, Field
+
+from app.api.deps import get_current_telegram_user
+from app.models.user import User
+from app.services.loans import generate_annuity_schedule, loan_summary
+from app.services.record_parser import ParsedRecord, parse_record_text
+
+router = APIRouter(tags=["parser"])
+
+
+class ParseRecordRequest(BaseModel):
+    text: str = Field(min_length=1, max_length=4000)
+
+
+class LoanCalculateRequest(BaseModel):
+    principal: Decimal = Field(gt=0)
+    term_months: int = Field(gt=0, le=600)
+    annual_interest_rate: Decimal = Field(ge=0)
+
+
+@router.post("/parse/record", response_model=ParsedRecord)
+async def parse_record(
+    payload: ParseRecordRequest,
+    current_user: User = Depends(get_current_telegram_user),
+) -> ParsedRecord:
+    return parse_record_text(payload.text)
+
+
+@router.post("/loans/calculate")
+async def calculate_loan(
+    payload: LoanCalculateRequest,
+    current_user: User = Depends(get_current_telegram_user),
+) -> dict:
+    summary = loan_summary(payload.principal, payload.term_months, payload.annual_interest_rate)
+    schedule = generate_annuity_schedule(
+        principal=payload.principal,
+        months=payload.term_months,
+        annual_rate=payload.annual_interest_rate,
+    )
+    return {
+        **summary,
+        "schedule": [
+            {
+                "number": row.number,
+                "payment": row.payment,
+                "principal": row.principal,
+                "interest": row.interest,
+                "remaining_principal": row.remaining_principal,
+            }
+            for row in schedule
+        ],
+    }