from sqlalchemy import Column, Integer, String, Date, Boolean, ForeignKey, Text, Float, DateTime
from sqlalchemy.orm import relationship
from .database import Base
from pydantic import BaseModel
from typing import Optional, List
from datetime import date

# --- SQLAlchemy Models ---

class User(Base):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True, index=True)
    username = Column(String, unique=True, index=True)
    hashed_password = Column(String)

    challenges = relationship("Challenge", back_populates="owner")
    health_metrics = relationship("DailyHealthMetrics", back_populates="user")
    workouts = relationship("WorkoutSession", back_populates="user")

class Challenge(Base):
    __tablename__ = "challenges"

    id = Column(Integer, primary_key=True, index=True)
    name = Column(String, index=True)
    period_type = Column(String)  # 'week', 'month', 'year'
    daily_target = Column(Integer)
    start_date = Column(Date)
    end_date = Column(Date)
    created_at = Column(Date, default=date.today)
    display_order = Column(Integer, default=0)
    user_id = Column(Integer, ForeignKey("users.id")) # New FK
    unit_type = Column(String, default="reps") # New: 'reps', 'minutes', 'pages', 'km'
    rest_days = Column(String, nullable=True) # New: comma-separated list of days
    icon = Column(String, default="fa-dumbbell") # New
    image_url = Column(String, nullable=True) # New
    description = Column(String, nullable=True) # New
    frequency_count = Column(Integer, nullable=True) # New
    selected_days = Column(String, nullable=True) # New

    owner = relationship("User", back_populates="challenges") # New Rel
    trackings = relationship("Tracking", back_populates="challenge", cascade="all, delete-orphan")

class Tracking(Base):
    __tablename__ = "tracking"

    id = Column(Integer, primary_key=True, index=True)
    challenge_id = Column(Integer, ForeignKey("challenges.id"))
    date = Column(Date)
    reps = Column(Integer, default=0)
    completed = Column(Boolean, default=False)
    notes = Column(Text, nullable=True)

    challenge = relationship("Challenge", back_populates="trackings")

class DailyHealthMetrics(Base):
    __tablename__ = "daily_health_metrics"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id"))
    date = Column(Date, index=True)
    step_count = Column(Integer, default=0)
    distance_meters = Column(Float, default=0.0)
    calories_burned = Column(Float, default=0.0)
    sleep_duration_minutes = Column(Integer, default=0)
    deep_sleep_minutes = Column(Integer, default=0)
    light_sleep_minutes = Column(Integer, default=0) # New
    rem_sleep_minutes = Column(Integer, default=0) # New
    awake_duration_minutes = Column(Integer, default=0)
    avg_heart_rate = Column(Integer, nullable=True)
    min_heart_rate = Column(Integer, nullable=True)
    max_heart_rate = Column(Integer, nullable=True)
    avg_spo2 = Column(Float, nullable=True)
    pai_score = Column(Float, default=0.0)
    weight = Column(Float, nullable=True) # New
    resting_heart_rate = Column(Integer, nullable=True) # New
    hrv = Column(Float, nullable=True) # New

    user = relationship("User", back_populates="health_metrics")

class WorkoutSession(Base):
    __tablename__ = "workout_sessions"

    id = Column(Integer, primary_key=True, index=True)
    user_id = Column(Integer, ForeignKey("users.id"))
    start_time = Column(DateTime)
    end_time = Column(DateTime)
    activity_type = Column(String)
    calories = Column(Float, default=0.0)
    avg_hr = Column(Integer, nullable=True)

    user = relationship("User", back_populates="workouts")


# --- Pydantic Schemas ---

class TrackingBase(BaseModel):
    date: date
    reps: int
    completed: bool = False
    notes: Optional[str] = None

class TrackingCreate(TrackingBase):
    challenge_id: int

class TrackingResponse(TrackingBase):
    id: int
    challenge_id: int

    class Config:
        from_attributes = True

class ChallengeBase(BaseModel):
    name: str
    period_type: str
    daily_target: int
    start_date: date
    end_date: Optional[date] = None
    unit_type: Optional[str] = "reps"
    rest_days: Optional[str] = None
    icon: Optional[str] = "fa-dumbbell"
    image_url: Optional[str] = None
    description: Optional[str] = None
    frequency_count: Optional[int] = None # For Monthly frequency (X times per month)
    selected_days: Optional[str] = None # For Weekly frequency (Mon,Wed,Fri)

class ChallengeCreate(ChallengeBase):
    pass

class ChallengeResponse(ChallengeBase):
    id: int
    created_at: date
    display_order: int = 0
    trackings: List[TrackingResponse] = []

    class Config:
        from_attributes = True

class DailyHealthMetricsBase(BaseModel):
    date: date
    step_count: Optional[int] = 0
    distance_meters: Optional[float] = 0.0
    calories_burned: Optional[float] = 0.0
    sleep_duration_minutes: Optional[int] = 0
    deep_sleep_minutes: Optional[int] = 0
    light_sleep_minutes: Optional[int] = 0
    rem_sleep_minutes: Optional[int] = 0
    awake_duration_minutes: Optional[int] = 0
    avg_heart_rate: Optional[int] = None
    min_heart_rate: Optional[int] = None
    max_heart_rate: Optional[int] = None
    avg_spo2: Optional[float] = None
    pai_score: Optional[float] = 0.0
    weight: Optional[float] = None
    resting_heart_rate: Optional[int] = None
    hrv: Optional[float] = None

class DailyHealthMetricsResponse(DailyHealthMetricsBase):
    id: int
    user_id: int

    class Config:
        from_attributes = True

# Auth Schemas
class UserCreate(BaseModel):
    username: str
    password: str

class UserResponse(BaseModel):
    id: int
    username: str

    class Config:
        from_attributes = True

class Token(BaseModel):
    access_token: str
    token_type: str