Feature/statistics

requirements.txt

@@ -9,3 +9,4 @@ SQLAlchemy==2.0.4
 SQLAlchemy-Utils==0.40.0
 starlette==0.25.0
 uvicorn==0.20.0
+python-dateutil~=2.8.2

src/routers/user.py

@@ -1,13 +1,19 @@
-from typing import List
+from typing import List, Optional
 
 from fastapi import APIRouter, Depends
 from sqlalchemy.orm import Session
+from starlette import status
+from starlette.exceptions import HTTPException
 
 import services
 from database import get_db
-from dependencies import get_current_user
+from dependencies import (
+    get_current_user,
+    transform_date_or_422,
+    transform_exact_date_or_422,
+)
 from models import User
-from schemas import UserBalance, UserModel
+from schemas import UserBalance, UserModel, UserTotalExpenses, UserTotalReplenishments
 
 router = APIRouter(
     prefix="/users",
@@ -34,3 +40,75 @@ def read_user_info(
     current_user: User = Depends(get_current_user),
 ) -> UserModel:
     return db.query(User).filter_by(id=current_user.id).one()
+
+
+@router.get("/total-expenses/", response_model=UserTotalExpenses)
+def read_user_total_expenses(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+    year_month: Optional[str] = None,
+    start_date: Optional[str] = None,
+    end_date: Optional[str] = None,
+) -> UserTotalExpenses:
+    if year_month and (start_date or end_date):
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+            detail="Cannot use filter_date with start_date or end_date",
+        )
+    elif (start_date and not end_date) or (end_date and not start_date):
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+            detail="Both start_date and end_date are required",
+        )
+    elif year_month:
+        filter_date = transform_date_or_422(year_month)
+        return services.user_total_expenses(
+            db, current_user.id, filter_date=filter_date
+        )
+    elif start_date and end_date:
+        start_date = transform_exact_date_or_422(start_date)
+        end_date = transform_exact_date_or_422(end_date)
+        return services.user_total_expenses(
+            db,
+            current_user.id,
+            start_date=start_date,
+            end_date=end_date,
+        )
+    else:
+        return services.user_total_expenses(db, current_user.id)
+
+
+@router.get("/total-replenishments/", response_model=UserTotalReplenishments)
+def read_user_total_expenses(
+    db: Session = Depends(get_db),
+    current_user: User = Depends(get_current_user),
+    year_month: Optional[str] = None,
+    start_date: Optional[str] = None,
+    end_date: Optional[str] = None,
+) -> UserTotalReplenishments:
+    if year_month and (start_date or end_date):
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+            detail="Cannot use filter_date with start_date or end_date",
+        )
+    elif (start_date and not end_date) or (end_date and not start_date):
+        raise HTTPException(
+            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
+            detail="Both start_date and end_date are required",
+        )
+    elif year_month:
+        filter_date = transform_date_or_422(year_month)
+        return services.user_total_replenishments(
+            db, current_user.id, filter_date=filter_date
+        )
+    elif start_date and end_date:
+        start_date = transform_exact_date_or_422(start_date)
+        end_date = transform_exact_date_or_422(end_date)
+        return services.user_total_replenishments(
+            db,
+            current_user.id,
+            start_date=start_date,
+            end_date=end_date,
+        )
+    else:
+        return services.user_total_replenishments(db, current_user.id)

src/schemas/__init__.py

@@ -1,4 +1,4 @@
-from .user import BaseUser, UserModel
+from .user import BaseUser, UserModel, UserTotalExpenses, UserTotalReplenishments
 from .group import (
     AboutCategory,
     AboutUser,

src/schemas/user.py

@@ -12,3 +12,13 @@ class UserModel(BaseUser):
     first_name: str
     last_name: str
     picture: Optional[str]
+
+
+class UserTotalExpenses(BaseModel):
+    amount: float
+    percentage_increase: float
+
+
+class UserTotalReplenishments(BaseModel):
+    amount: float
+    percentage_increase: float

src/services/__init__.py

@@ -26,4 +26,9 @@
     update_replenishment,
     delete_replenishment,
 )
-from .user import get_user, calculate_user_balance
+from .user import (
+    get_user,
+    calculate_user_balance,
+    user_total_expenses,
+    user_total_replenishments,
+)

src/services/user.py

@@ -1,10 +1,15 @@
-from typing import Optional
+from typing import Optional, Union
+from dateutil.relativedelta import relativedelta
 
+from starlette import status
+from starlette.exceptions import HTTPException
 from sqlalchemy.orm import Session
 from sqlalchemy.sql.functions import coalesce, sum
+from sqlalchemy import and_, exc, extract
+from pydantic.schema import date
 
 from models import Expense, Replenishment, User
-from schemas import UserBalance
+from schemas import UserBalance, UserTotalExpenses, UserTotalReplenishments
 
 
 def get_user(db: Session, login: str) -> Optional[User]:
@@ -22,3 +27,149 @@ def calculate_user_balance(db: Session, user_id: int) -> UserBalance:
     user_balance = replenishments - expenses
     user_balance = UserBalance(balance=user_balance)
     return user_balance
+
+
+def get_total_actions_for_month(
+    db: Session,
+    user_id: int,
+    year: date,
+    month: date,
+    model: Union[Expense, Replenishment],
+) -> float:
+    return db.query(
+        coalesce(
+            sum(model.amount).filter(
+                and_(
+                    model.user_id == user_id,
+                    extract("year", model.time) == year,
+                    extract("month", model.time) == month,
+                )
+            ),
+            0,
+        )
+    ).one()[0]
+
+
+def get_total_actions_for_time_range(
+    db: Session,
+    user_id: int,
+    start_date: date,
+    end_date: date,
+    model: Union[Expense, Replenishment],
+) -> float:
+    return db.query(
+        coalesce(
+            sum(model.amount).filter(
+                and_(
+                    model.user_id == user_id,
+                    model.time >= start_date,
+                    model.time <= end_date,
+                )
+            ),
+            0,
+        )
+    ).one()[0]
+
+
+def user_total_expenses(
+    db: Session,
+    user_id: int,
+    filter_date: Optional[date] = None,
+    start_date: Optional[date] = None,
+    end_date: Optional[date] = None,
+) -> UserTotalExpenses:
+    if filter_date and start_date or filter_date and end_date:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Too many arguments! It is necessary to select either a month or a start date and an end date!",
+        )
+    (amount,) = db.query(
+        coalesce(sum(Expense.amount).filter(Expense.user_id == user_id), 0)
+    ).one()
+    percentage_increase = 0
+
+    if filter_date:
+        year, month = filter_date.year, filter_date.month
+        amount = get_total_actions_for_month(db, user_id, year, month, Expense)
+
+        filter_date = filter_date - relativedelta(months=1)
+        previous_year, previous_month = filter_date.year, filter_date.month
+        previous_month_amount = get_total_actions_for_month(
+            db, user_id, previous_year, previous_month, Expense
+        )
+
+        if previous_month_amount != 0:
+            percentage_increase = (
+                amount - previous_month_amount
+            ) / previous_month_amount
+
+    elif start_date and end_date:
+        amount = get_total_actions_for_time_range(
+            db, user_id, start_date, end_date, Expense
+        )
+
+        days_difference = (end_date - start_date).days
+        zero_date = start_date - relativedelta(days=days_difference)
+        previous_days_amount = get_total_actions_for_time_range(
+            db, user_id, zero_date, start_date, Expense
+        )
+
+        if previous_days_amount != 0:
+            percentage_increase = (amount - previous_days_amount) / previous_days_amount
+
+    total_expenses = UserTotalExpenses(
+        amount=amount, percentage_increase=percentage_increase
+    )
+    return total_expenses
+
+
+def user_total_replenishments(
+    db: Session,
+    user_id: int,
+    filter_date: Optional[date] = None,
+    start_date: Optional[date] = None,
+    end_date: Optional[date] = None,
+) -> UserTotalReplenishments:
+    if filter_date and start_date or filter_date and end_date:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Too many arguments! It is necessary to select either a month or a start date and an end date!",
+        )
+    (amount,) = db.query(
+        coalesce(sum(Replenishment.amount).filter(Replenishment.user_id == user_id), 0)
+    ).one()
+    percentage_increase = 0
+
+    if filter_date:
+        year, month = filter_date.year, filter_date.month
+        amount = get_total_actions_for_month(db, user_id, year, month, Replenishment)
+
+        filter_date = filter_date - relativedelta(months=1)
+        previous_year, previous_month = filter_date.year, filter_date.month
+        previous_month_amount = get_total_actions_for_month(
+            db, user_id, previous_year, previous_month, Replenishment
+        )
+
+        if previous_month_amount != 0:
+            percentage_increase = (
+                amount - previous_month_amount
+            ) / previous_month_amount
+
+    elif start_date and end_date:
+        amount = get_total_actions_for_time_range(
+            db, user_id, start_date, end_date, Replenishment
+        )
+
+        days_difference = (end_date - start_date).days
+        zero_date = start_date - relativedelta(days=days_difference)
+        previous_days_amount = get_total_actions_for_time_range(
+            db, user_id, zero_date, start_date, Replenishment
+        )
+
+        if previous_days_amount != 0:
+            percentage_increase = (amount - previous_days_amount) / previous_days_amount
+
+    total_replenishments = UserTotalReplenishments(
+        amount=amount, percentage_increase=percentage_increase
+    )
+    return total_replenishments