Update code via agent code generation

alembic.ini

@@ -0,0 +1,41 @@
+[alembic]
+script_location = alembic
+prepend_sys_path = .
+version_path_separator = os
+sqlalchemy.url = sqlite:////app/storage/db/db.sqlite
+
+[post_write_hooks]
+
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S

alembic/env.py

@@ -0,0 +1,55 @@
+import os
+import sys
+from logging.config import fileConfig
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+sys.path = ['', '..'] + sys.path[1:]
+
+from app.db.base import Base
+from app.models.user import User
+from app.models.task import Task
+
+config = context.config
+
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+target_metadata = Base.metadata
+
+def run_migrations_offline() -> None:
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection, target_metadata=target_metadata
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()

alembic/script.py.mako

@@ -0,0 +1,24 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision = ${repr(up_revision)}
+down_revision = ${repr(down_revision)}
+branch_labels = ${repr(branch_labels)}
+depends_on = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}

alembic/versions/001_initial_migration.py

@@ -0,0 +1,63 @@
+"""Initial migration
+
+Revision ID: 001
+Revises: 
+Create Date: 2024-01-01 00:00:00.000000
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+# revision identifiers, used by Alembic.
+revision = '001'
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('users',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('email', sa.String(), nullable=False),
+    sa.Column('hashed_password', sa.String(), nullable=False),
+    sa.Column('full_name', sa.String(), nullable=True),
+    sa.Column('phone_number', sa.String(), nullable=True),
+    sa.Column('whatsapp_number', sa.String(), nullable=True),
+    sa.Column('is_active', sa.Boolean(), nullable=True),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+    sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_users_email'), 'users', ['email'], unique=True)
+    op.create_index(op.f('ix_users_id'), 'users', ['id'], unique=False)
+    op.create_table('tasks',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('title', sa.String(), nullable=False),
+    sa.Column('description', sa.Text(), nullable=True),
+    sa.Column('status', sa.Enum('PENDING', 'IN_PROGRESS', 'COMPLETED', 'CANCELLED', name='taskstatus'), nullable=True),
+    sa.Column('priority', sa.Enum('LOW', 'MEDIUM', 'HIGH', 'URGENT', name='taskpriority'), nullable=True),
+    sa.Column('due_date', sa.DateTime(timezone=True), nullable=True),
+    sa.Column('scheduled_at', sa.DateTime(timezone=True), nullable=True),
+    sa.Column('ai_suggested_time', sa.DateTime(timezone=True), nullable=True),
+    sa.Column('whatsapp_reminder_sent', sa.Boolean(), nullable=True),
+    sa.Column('whatsapp_completion_sent', sa.Boolean(), nullable=True),
+    sa.Column('owner_id', sa.Integer(), nullable=False),
+    sa.Column('created_at', sa.DateTime(timezone=True), server_default=sa.text('(CURRENT_TIMESTAMP)'), nullable=True),
+    sa.Column('updated_at', sa.DateTime(timezone=True), nullable=True),
+    sa.Column('completed_at', sa.DateTime(timezone=True), nullable=True),
+    sa.ForeignKeyConstraint(['owner_id'], ['users.id'], ),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_tasks_id'), 'tasks', ['id'], unique=False)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_tasks_id'), table_name='tasks')
+    op.drop_table('tasks')
+    op.drop_index(op.f('ix_users_id'), table_name='users')
+    op.drop_index(op.f('ix_users_email'), table_name='users')
+    op.drop_table('users')
+    # ### end Alembic commands ###

app/api/auth.py

@@ -0,0 +1,53 @@
+from datetime import timedelta
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from app.db.session import get_db
+from app.models.user import User
+from app.api.schemas import UserCreate, UserResponse, UserLogin, Token
+from app.core.security import verify_password, get_password_hash, create_access_token
+from app.core.config import settings
+
+router = APIRouter()
+
+
+@router.post("/register", response_model=UserResponse)
+def register_user(user: UserCreate, db: Session = Depends(get_db)):
+    db_user = db.query(User).filter(User.email == user.email).first()
+    if db_user:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Email already registered"
+        )
+    
+    hashed_password = get_password_hash(user.password)
+    db_user = User(
+        email=user.email,
+        hashed_password=hashed_password,
+        full_name=user.full_name,
+        phone_number=user.phone_number,
+        whatsapp_number=user.whatsapp_number
+    )
+    db.add(db_user)
+    db.commit()
+    db.refresh(db_user)
+    
+    return db_user
+
+
+@router.post("/login", response_model=Token)
+def login_user(user_credentials: UserLogin, db: Session = Depends(get_db)):
+    user = db.query(User).filter(User.email == user_credentials.email).first()
+    
+    if not user or not verify_password(user_credentials.password, user.hashed_password):
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Incorrect email or password",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+    
+    access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    access_token = create_access_token(
+        data={"sub": user.email}, expires_delta=access_token_expires
+    )
+    
+    return {"access_token": access_token, "token_type": "bearer"}

app/api/schemas.py

@@ -0,0 +1,76 @@
+from datetime import datetime
+from typing import Optional
+from pydantic import BaseModel, EmailStr
+from app.models.task import TaskStatus, TaskPriority
+
+
+class UserBase(BaseModel):
+    email: EmailStr
+    full_name: Optional[str] = None
+    phone_number: Optional[str] = None
+    whatsapp_number: Optional[str] = None
+
+
+class UserCreate(UserBase):
+    password: str
+
+
+class UserResponse(UserBase):
+    id: int
+    is_active: bool
+    created_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+class UserLogin(BaseModel):
+    email: EmailStr
+    password: str
+
+
+class Token(BaseModel):
+    access_token: str
+    token_type: str
+
+
+class TaskBase(BaseModel):
+    title: str
+    description: Optional[str] = None
+    priority: TaskPriority = TaskPriority.MEDIUM
+    due_date: Optional[datetime] = None
+    scheduled_at: Optional[datetime] = None
+
+
+class TaskCreate(TaskBase):
+    pass
+
+
+class TaskUpdate(BaseModel):
+    title: Optional[str] = None
+    description: Optional[str] = None
+    priority: Optional[TaskPriority] = None
+    status: Optional[TaskStatus] = None
+    due_date: Optional[datetime] = None
+    scheduled_at: Optional[datetime] = None
+
+
+class TaskResponse(TaskBase):
+    id: int
+    status: TaskStatus
+    ai_suggested_time: Optional[datetime] = None
+    whatsapp_reminder_sent: bool
+    whatsapp_completion_sent: bool
+    owner_id: int
+    created_at: datetime
+    updated_at: Optional[datetime] = None
+    completed_at: Optional[datetime] = None
+
+    class Config:
+        from_attributes = True
+
+
+class HealthResponse(BaseModel):
+    status: str
+    timestamp: datetime
+    version: str

app/api/tasks.py

@@ -0,0 +1,165 @@
+from typing import List
+from fastapi import APIRouter, Depends, HTTPException, status
+from sqlalchemy.orm import Session
+from datetime import datetime
+from app.db.session import get_db
+from app.models.user import User
+from app.models.task import Task, TaskStatus
+from app.api.schemas import TaskCreate, TaskUpdate, TaskResponse
+from app.core.auth import get_current_user
+from app.services.ai_service import suggest_optimal_time
+from app.services.whatsapp_service import send_task_reminder
+
+router = APIRouter()
+
+
+@router.post("/", response_model=TaskResponse)
+def create_task(
+    task: TaskCreate,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db)
+):
+    ai_suggested_time = None
+    if task.due_date and not task.scheduled_at:
+        ai_suggested_time = suggest_optimal_time(task.due_date, task.priority)
+    
+    db_task = Task(
+        title=task.title,
+        description=task.description,
+        priority=task.priority,
+        due_date=task.due_date,
+        scheduled_at=task.scheduled_at,
+        ai_suggested_time=ai_suggested_time,
+        owner_id=current_user.id
+    )
+    db.add(db_task)
+    db.commit()
+    db.refresh(db_task)
+    
+    return db_task
+
+
+@router.get("/", response_model=List[TaskResponse])
+def get_tasks(
+    skip: int = 0,
+    limit: int = 100,
+    status: TaskStatus = None,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db)
+):
+    query = db.query(Task).filter(Task.owner_id == current_user.id)
+    if status:
+        query = query.filter(Task.status == status)
+    
+    tasks = query.offset(skip).limit(limit).all()
+    return tasks
+
+
+@router.get("/{task_id}", response_model=TaskResponse)
+def get_task(
+    task_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db)
+):
+    task = db.query(Task).filter(
+        Task.id == task_id,
+        Task.owner_id == current_user.id
+    ).first()
+    
+    if not task:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Task not found"
+        )
+    
+    return task
+
+
+@router.put("/{task_id}", response_model=TaskResponse)
+def update_task(
+    task_id: int,
+    task_update: TaskUpdate,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db)
+):
+    task = db.query(Task).filter(
+        Task.id == task_id,
+        Task.owner_id == current_user.id
+    ).first()
+    
+    if not task:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Task not found"
+        )
+    
+    update_data = task_update.dict(exclude_unset=True)
+    
+    if task_update.status == TaskStatus.COMPLETED and task.status != TaskStatus.COMPLETED:
+        update_data["completed_at"] = datetime.utcnow()
+    
+    for field, value in update_data.items():
+        setattr(task, field, value)
+    
+    db.commit()
+    db.refresh(task)
+    
+    return task
+
+
+@router.delete("/{task_id}")
+def delete_task(
+    task_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db)
+):
+    task = db.query(Task).filter(
+        Task.id == task_id,
+        Task.owner_id == current_user.id
+    ).first()
+    
+    if not task:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Task not found"
+        )
+    
+    db.delete(task)
+    db.commit()
+    
+    return {"message": "Task deleted successfully"}
+
+
+@router.post("/{task_id}/send-reminder")
+def send_reminder(
+    task_id: int,
+    current_user: User = Depends(get_current_user),
+    db: Session = Depends(get_db)
+):
+    task = db.query(Task).filter(
+        Task.id == task_id,
+        Task.owner_id == current_user.id
+    ).first()
+    
+    if not task:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="Task not found"
+        )
+    
+    if not current_user.whatsapp_number:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="WhatsApp number not configured"
+        )
+    
+    success = send_task_reminder(current_user.whatsapp_number, task)
+    if success:
+        task.whatsapp_reminder_sent = True
+        db.commit()
+        return {"message": "Reminder sent successfully"}
+    else:
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail="Failed to send reminder"
+        )

app/core/auth.py

@@ -0,0 +1,31 @@
+from fastapi import Depends, HTTPException, status
+from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
+from sqlalchemy.orm import Session
+from app.db.session import get_db
+from app.models.user import User
+from app.core.security import verify_token
+
+security = HTTPBearer()
+
+
+def get_current_user(
+    credentials: HTTPAuthorizationCredentials = Depends(security),
+    db: Session = Depends(get_db)
+) -> User:
+    payload = verify_token(credentials.credentials)
+    email = payload.get("sub")
+    
+    user = db.query(User).filter(User.email == email).first()
+    if user is None:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="User not found"
+        )
+    
+    if not user.is_active:
+        raise HTTPException(
+            status_code=status.HTTP_400_BAD_REQUEST,
+            detail="Inactive user"
+        )
+    
+    return user

app/core/config.py

@@ -0,0 +1,23 @@
+import os
+from pydantic import BaseSettings
+
+
+class Settings(BaseSettings):
+    SECRET_KEY: str = os.getenv("SECRET_KEY", "your-secret-key-here")
+    ALGORITHM: str = "HS256"
+    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30
+    
+    TWILIO_ACCOUNT_SID: str = os.getenv("TWILIO_ACCOUNT_SID", "")
+    TWILIO_AUTH_TOKEN: str = os.getenv("TWILIO_AUTH_TOKEN", "")
+    TWILIO_WHATSAPP_FROM: str = os.getenv("TWILIO_WHATSAPP_FROM", "")
+    
+    OPENAI_API_KEY: str = os.getenv("OPENAI_API_KEY", "")
+    
+    PROJECT_NAME: str = "WhatsApp AI Task Scheduling Service"
+    PROJECT_VERSION: str = "1.0.0"
+
+    class Config:
+        env_file = ".env"
+
+
+settings = Settings()

app/core/security.py

@@ -0,0 +1,46 @@
+from datetime import datetime, timedelta
+from typing import Optional
+from jose import JWTError, jwt
+from passlib.context import CryptContext
+from fastapi import HTTPException, status
+from app.core.config import settings
+
+pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")
+
+
+def verify_password(plain_password: str, hashed_password: str) -> bool:
+    return pwd_context.verify(plain_password, hashed_password)
+
+
+def get_password_hash(password: str) -> str:
+    return pwd_context.hash(password)
+
+
+def create_access_token(data: dict, expires_delta: Optional[timedelta] = None):
+    to_encode = data.copy()
+    if expires_delta:
+        expire = datetime.utcnow() + expires_delta
+    else:
+        expire = datetime.utcnow() + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
+    to_encode.update({"exp": expire})
+    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
+    return encoded_jwt
+
+
+def verify_token(token: str) -> dict:
+    try:
+        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
+        email: str = payload.get("sub")
+        if email is None:
+            raise HTTPException(
+                status_code=status.HTTP_401_UNAUTHORIZED,
+                detail="Could not validate credentials",
+                headers={"WWW-Authenticate": "Bearer"},
+            )
+        return payload
+    except JWTError:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Could not validate credentials",
+            headers={"WWW-Authenticate": "Bearer"},
+        )

app/db/base.py

@@ -0,0 +1,3 @@
+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()

app/db/session.py

@@ -0,0 +1,22 @@
+from pathlib import Path
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+DB_DIR = Path("/app") / "storage" / "db"
+DB_DIR.mkdir(parents=True, exist_ok=True)
+
+SQLALCHEMY_DATABASE_URL = f"sqlite:///{DB_DIR}/db.sqlite"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL,
+    connect_args={"check_same_thread": False}
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()

app/models/task.py

@@ -0,0 +1,40 @@
+from sqlalchemy import Column, Integer, String, DateTime, Boolean, Text, ForeignKey, Enum
+from sqlalchemy.sql import func
+from sqlalchemy.orm import relationship
+from app.db.base import Base
+import enum
+
+
+class TaskStatus(str, enum.Enum):
+    PENDING = "pending"
+    IN_PROGRESS = "in_progress"
+    COMPLETED = "completed"
+    CANCELLED = "cancelled"
+
+
+class TaskPriority(str, enum.Enum):
+    LOW = "low"
+    MEDIUM = "medium"
+    HIGH = "high"
+    URGENT = "urgent"
+
+
+class Task(Base):
+    __tablename__ = "tasks"
+
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String, nullable=False)
+    description = Column(Text, nullable=True)
+    status = Column(Enum(TaskStatus), default=TaskStatus.PENDING)
+    priority = Column(Enum(TaskPriority), default=TaskPriority.MEDIUM)
+    due_date = Column(DateTime(timezone=True), nullable=True)
+    scheduled_at = Column(DateTime(timezone=True), nullable=True)
+    ai_suggested_time = Column(DateTime(timezone=True), nullable=True)
+    whatsapp_reminder_sent = Column(Boolean, default=False)
+    whatsapp_completion_sent = Column(Boolean, default=False)
+    owner_id = Column(Integer, ForeignKey("users.id"), nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+    completed_at = Column(DateTime(timezone=True), nullable=True)
+
+    owner = relationship("User", back_populates="tasks")

app/models/user.py

@@ -0,0 +1,20 @@
+from sqlalchemy import Column, Integer, String, DateTime, Boolean
+from sqlalchemy.sql import func
+from sqlalchemy.orm import relationship
+from app.db.base import Base
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    email = Column(String, unique=True, index=True, nullable=False)
+    hashed_password = Column(String, nullable=False)
+    full_name = Column(String, nullable=True)
+    phone_number = Column(String, nullable=True)
+    whatsapp_number = Column(String, nullable=True)
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), onupdate=func.now())
+
+    tasks = relationship("Task", back_populates="owner")

app/services/ai_service.py

@@ -0,0 +1,133 @@
+import logging
+from datetime import datetime, timedelta
+from typing import Optional, List
+import openai
+from app.core.config import settings
+from app.models.task import TaskPriority
+
+logger = logging.getLogger(__name__)
+
+
+class AIService:
+    def __init__(self):
+        if settings.OPENAI_API_KEY:
+            openai.api_key = settings.OPENAI_API_KEY
+            self.client = openai.OpenAI(api_key=settings.OPENAI_API_KEY)
+        else:
+            self.client = None
+            logger.warning("OpenAI API key not configured. AI functionality disabled.")
+
+    def suggest_optimal_time(self, due_date: datetime, priority: TaskPriority) -> Optional[datetime]:
+        if not self.client:
+            return self._fallback_scheduling(due_date, priority)
+
+        try:
+            current_time = datetime.utcnow()
+            time_until_due = due_date - current_time
+            
+            if time_until_due.total_seconds() <= 0:
+                return current_time + timedelta(hours=1)
+
+            prompt = f"""
+            Based on task management best practices, suggest an optimal time to work on a task with the following details:
+            
+            Current time: {current_time.strftime('%Y-%m-%d %H:%M:%S')}
+            Due date: {due_date.strftime('%Y-%m-%d %H:%M:%S')}
+            Priority: {priority.value}
+            Time available: {time_until_due.days} days, {time_until_due.seconds // 3600} hours
+            
+            Consider:
+            - Task priority (urgent tasks should be scheduled sooner)
+            - Optimal work hours (9 AM - 5 PM on weekdays)
+            - Buffer time before due date
+            - Work-life balance
+            
+            Respond with only the suggested datetime in format: YYYY-MM-DD HH:MM:SS
+            """
+
+            response = self.client.chat.completions.create(
+                model="gpt-3.5-turbo",
+                messages=[
+                    {"role": "system", "content": "You are a task scheduling AI assistant."},
+                    {"role": "user", "content": prompt}
+                ],
+                max_tokens=50,
+                temperature=0.3
+            )
+
+            suggested_time_str = response.choices[0].message.content.strip()
+            suggested_time = datetime.strptime(suggested_time_str, '%Y-%m-%d %H:%M:%S')
+            
+            if suggested_time < current_time:
+                suggested_time = current_time + timedelta(hours=1)
+            elif suggested_time > due_date:
+                suggested_time = due_date - timedelta(hours=2)
+
+            return suggested_time
+
+        except Exception as e:
+            logger.error(f"AI scheduling failed: {str(e)}")
+            return self._fallback_scheduling(due_date, priority)
+
+    def _fallback_scheduling(self, due_date: datetime, priority: TaskPriority) -> datetime:
+        current_time = datetime.utcnow()
+        time_until_due = due_date - current_time
+
+        if priority == TaskPriority.URGENT:
+            return current_time + timedelta(hours=1)
+        elif priority == TaskPriority.HIGH:
+            return current_time + timedelta(hours=min(6, time_until_due.total_seconds() // 3600 // 4))
+        elif priority == TaskPriority.MEDIUM:
+            return current_time + timedelta(hours=min(24, time_until_due.total_seconds() // 3600 // 2))
+        else:  # LOW priority
+            return current_time + timedelta(hours=min(48, time_until_due.total_seconds() // 3600 * 0.75))
+
+    def generate_task_insights(self, tasks: List) -> str:
+        if not self.client:
+            return "AI insights not available. Please configure OpenAI API key."
+
+        try:
+            task_summary = []
+            for task in tasks:
+                task_summary.append(f"- {task.title} (Priority: {task.priority.value}, Status: {task.status.value})")
+
+            prompt = f"""
+            Analyze the following task list and provide productivity insights:
+            
+            {chr(10).join(task_summary)}
+            
+            Provide insights on:
+            1. Task distribution by priority
+            2. Potential bottlenecks
+            3. Productivity recommendations
+            4. Time management suggestions
+            
+            Keep the response concise and actionable (max 200 words).
+            """
+
+            response = self.client.chat.completions.create(
+                model="gpt-3.5-turbo",
+                messages=[
+                    {"role": "system", "content": "You are a productivity analysis AI assistant."},
+                    {"role": "user", "content": prompt}
+                ],
+                max_tokens=250,
+                temperature=0.7
+            )
+
+            return response.choices[0].message.content.strip()
+
+        except Exception as e:
+            logger.error(f"AI insights generation failed: {str(e)}")
+            return "Unable to generate insights at this time."
+
+
+ai_service = AIService()
+
+
+def suggest_optimal_time(due_date: datetime, priority: TaskPriority) -> Optional[datetime]:
+    return ai_service.suggest_optimal_time(due_date, priority)
+
+
+def generate_task_insights(tasks: List) -> str:
+    return ai_service.generate_task_insights(tasks)

app/services/scheduler_service.py

@@ -0,0 +1,129 @@
+import logging
+from datetime import datetime, timedelta
+from apscheduler.schedulers.background import BackgroundScheduler
+from apscheduler.triggers.cron import CronTrigger
+from sqlalchemy.orm import Session
+from app.db.session import SessionLocal
+from app.models.task import Task, TaskStatus
+from app.models.user import User
+from app.services.whatsapp_service import send_task_reminder, send_task_overdue
+
+logger = logging.getLogger(__name__)
+
+
+class SchedulerService:
+    def __init__(self):
+        self.scheduler = BackgroundScheduler()
+        self.scheduler.start()
+        self._setup_jobs()
+
+    def _setup_jobs(self):
+        self.scheduler.add_job(
+            func=self.send_reminders,
+            trigger=CronTrigger(hour=9, minute=0),  # Daily at 9 AM
+            id='daily_reminders',
+            name='Send daily task reminders',
+            replace_existing=True
+        )
+
+        self.scheduler.add_job(
+            func=self.check_overdue_tasks,
+            trigger=CronTrigger(hour=18, minute=0),  # Daily at 6 PM
+            id='overdue_check',
+            name='Check for overdue tasks',
+            replace_existing=True
+        )
+
+    def send_reminders(self):
+        logger.info("Starting daily reminder job")
+        db: Session = SessionLocal()
+        
+        try:
+            # Get tasks scheduled for today that haven't been reminded
+            today = datetime.utcnow().date()
+            tomorrow = today + timedelta(days=1)
+            
+            tasks = db.query(Task).join(User).filter(
+                Task.status.in_([TaskStatus.PENDING, TaskStatus.IN_PROGRESS]),
+                Task.scheduled_at >= datetime.combine(today, datetime.min.time()),
+                Task.scheduled_at < datetime.combine(tomorrow, datetime.min.time()),
+                Task.whatsapp_reminder_sent == False,
+                User.whatsapp_number.isnot(None)
+            ).all()
+
+            sent_count = 0
+            for task in tasks:
+                if send_task_reminder(task.owner.whatsapp_number, task):
+                    task.whatsapp_reminder_sent = True
+                    sent_count += 1
+
+            db.commit()
+            logger.info(f"Sent {sent_count} reminders")
+
+        except Exception as e:
+            logger.error(f"Error in reminder job: {str(e)}")
+            db.rollback()
+        finally:
+            db.close()
+
+    def check_overdue_tasks(self):
+        logger.info("Starting overdue task check")
+        db: Session = SessionLocal()
+        
+        try:
+            now = datetime.utcnow()
+            overdue_tasks = db.query(Task).join(User).filter(
+                Task.status.in_([TaskStatus.PENDING, TaskStatus.IN_PROGRESS]),
+                Task.due_date < now,
+                User.whatsapp_number.isnot(None)
+            ).all()
+
+            sent_count = 0
+            for task in overdue_tasks:
+                if send_task_overdue(task.owner.whatsapp_number, task):
+                    sent_count += 1
+
+            logger.info(f"Sent {sent_count} overdue notifications")
+
+        except Exception as e:
+            logger.error(f"Error in overdue check job: {str(e)}")
+        finally:
+            db.close()
+
+    def schedule_task_reminder(self, task_id: int, remind_at: datetime):
+        job_id = f"task_reminder_{task_id}"
+        
+        self.scheduler.add_job(
+            func=self._send_individual_reminder,
+            trigger='date',
+            run_date=remind_at,
+            args=[task_id],
+            id=job_id,
+            name=f'Reminder for task {task_id}',
+            replace_existing=True
+        )
+
+    def _send_individual_reminder(self, task_id: int):
+        db: Session = SessionLocal()
+        
+        try:
+            task = db.query(Task).join(User).filter(
+                Task.id == task_id,
+                User.whatsapp_number.isnot(None)
+            ).first()
+
+            if task and task.status in [TaskStatus.PENDING, TaskStatus.IN_PROGRESS]:
+                send_task_reminder(task.owner.whatsapp_number, task)
+                task.whatsapp_reminder_sent = True
+                db.commit()
+
+        except Exception as e:
+            logger.error(f"Error sending individual reminder for task {task_id}: {str(e)}")
+        finally:
+            db.close()
+
+    def shutdown(self):
+        self.scheduler.shutdown()
+
+
+scheduler_service = SchedulerService()

app/services/whatsapp_service.py

@@ -0,0 +1,64 @@
+import logging
+from typing import Optional
+from twilio.rest import Client
+from twilio.base.exceptions import TwilioException
+from app.core.config import settings
+from app.models.task import Task
+
+logger = logging.getLogger(__name__)
+
+
+class WhatsAppService:
+    def __init__(self):
+        if settings.TWILIO_ACCOUNT_SID and settings.TWILIO_AUTH_TOKEN:
+            self.client = Client(settings.TWILIO_ACCOUNT_SID, settings.TWILIO_AUTH_TOKEN)
+        else:
+            self.client = None
+            logger.warning("Twilio credentials not configured. WhatsApp functionality disabled.")
+
+    def send_message(self, to_number: str, message: str) -> bool:
+        if not self.client:
+            logger.error("WhatsApp service not configured")
+            return False
+
+        try:
+            # Ensure phone number is in WhatsApp format
+            if not to_number.startswith("whatsapp:"):
+                to_number = f"whatsapp:{to_number}"
+
+            message = self.client.messages.create(
+                body=message,
+                from_=settings.TWILIO_WHATSAPP_FROM,
+                to=to_number
+            )
+            logger.info(f"WhatsApp message sent successfully. SID: {message.sid}")
+            return True
+        except TwilioException as e:
+            logger.error(f"Failed to send WhatsApp message: {str(e)}")
+            return False
+        except Exception as e:
+            logger.error(f"Unexpected error sending WhatsApp message: {str(e)}")
+            return False
+
+
+whatsapp_service = WhatsAppService()
+
+
+def send_task_reminder(phone_number: str, task: Task) -> bool:
+    due_info = f" (Due: {task.due_date.strftime('%Y-%m-%d %H:%M')})" if task.due_date else ""
+    message = f"🔔 Task Reminder: {task.title}\n\n{task.description or 'No description provided'}{due_info}\n\nPriority: {task.priority.value.upper()}"
+    
+    return whatsapp_service.send_message(phone_number, message)
+
+
+def send_task_completion(phone_number: str, task: Task) -> bool:
+    message = f"✅ Task Completed: {task.title}\n\nCongratulations! You've successfully completed this task."
+    
+    return whatsapp_service.send_message(phone_number, message)
+
+
+def send_task_overdue(phone_number: str, task: Task) -> bool:
+    overdue_days = (task.due_date - task.created_at).days if task.due_date else 0
+    message = f"⚠️ Task Overdue: {task.title}\n\nThis task is overdue by {overdue_days} days. Please complete it as soon as possible.\n\nPriority: {task.priority.value.upper()}"
+    
+    return whatsapp_service.send_message(phone_number, message)

requirements.txt

@@ -0,0 +1,15 @@
+fastapi==0.104.1
+uvicorn==0.24.0
+sqlalchemy==2.0.23
+alembic==1.13.0
+pydantic==2.5.0
+python-multipart==0.0.6
+passlib==1.7.4
+python-jose==3.3.0
+bcrypt==4.1.2
+httpx==0.25.2
+python-dotenv==1.0.0
+apscheduler==3.10.4
+openai==1.3.7
+twilio==8.10.3
+ruff==0.1.6