from sqlalchemy import (
    Column, Integer, String, Float, DateTime, Boolean,
    ForeignKey, Text, JSON, Index, UniqueConstraint, text
)
from sqlalchemy.orm import relationship
from datetime import datetime, timezone
from app.core.database import Base


def now_utc():
    return datetime.now(timezone.utc)


class User(Base):
    __tablename__ = "users"

    id = Column(Integer, primary_key=True)
    username = Column(String(64), unique=True, nullable=False, index=True)
    email = Column(String(256), unique=True, nullable=True)
    hashed_password = Column(String(256), nullable=True)
    is_admin = Column(Boolean, default=False)
    pocketid_sub = Column(String(256), unique=True, nullable=True)
    created_at = Column(DateTime(timezone=True), default=now_utc)

    # Health profile
    max_heart_rate = Column(Integer, nullable=True)
    resting_heart_rate = Column(Integer, nullable=True)
    birth_year = Column(Integer, nullable=True)
    height_cm = Column(Float, nullable=True)

    # PocketID config (stored per-user so admin can set via UI)
    pocketid_issuer = Column(String(512), nullable=True)
    pocketid_client_id = Column(String(256), nullable=True)
    pocketid_client_secret = Column(String(256), nullable=True)

    activities = relationship("Activity", back_populates="user", cascade="all, delete-orphan")
    health_metrics = relationship("HealthMetric", back_populates="user", cascade="all, delete-orphan")
    named_routes = relationship("NamedRoute", back_populates="user", cascade="all, delete-orphan")
    weight_logs = relationship("WeightLog", back_populates="user", cascade="all, delete-orphan")
    garmin_connect_config = relationship("GarminConnectConfig", back_populates="user", uselist=False, cascade="all, delete-orphan")


class GarminConnectConfig(Base):
    """Per-user Garmin Connect credentials and sync state."""
    __tablename__ = "garmin_connect_configs"

    id = Column(Integer, primary_key=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, unique=True, index=True)
    email = Column(String(256), nullable=False)
    password_enc = Column(String(512), nullable=False)   # Fernet-encrypted
    token_store = Column(Text, nullable=True)             # garth OAuth2 token JSON
    sync_enabled = Column(Boolean, default=True)
    sync_activities = Column(Boolean, default=True)
    sync_wellness = Column(Boolean, default=True)
    sync_lookback_days = Column(Integer, default=30)   # -1 = all-time
    last_sync_at = Column(DateTime(timezone=True), nullable=True)
    last_sync_status = Column(String(512), nullable=True)
    created_at = Column(DateTime(timezone=True), default=now_utc)

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


class WeightLog(Base):
    """Manual weight entries separate from health_metrics for easy tracking."""
    __tablename__ = "weight_logs"

    id = Column(Integer, primary_key=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
    date = Column(DateTime(timezone=True), nullable=False)
    weight_kg = Column(Float, nullable=False)
    body_fat_pct = Column(Float, nullable=True)
    note = Column(String(256), nullable=True)

    __table_args__ = (
        Index("ix_weight_user_date", "user_id", "date"),
    )

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


class Activity(Base):
    __tablename__ = "activities"

    id = Column(Integer, primary_key=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
    name = Column(String(256), nullable=False)
    sport_type = Column(String(64), nullable=False)
    start_time = Column(DateTime(timezone=True), nullable=False, index=True)
    end_time = Column(DateTime(timezone=True), nullable=True)
    distance_m = Column(Float, nullable=True)
    duration_s = Column(Float, nullable=True)
    elevation_gain_m = Column(Float, nullable=True)
    elevation_loss_m = Column(Float, nullable=True)
    avg_heart_rate = Column(Float, nullable=True)
    max_heart_rate = Column(Float, nullable=True)
    avg_cadence = Column(Float, nullable=True)
    avg_power = Column(Float, nullable=True)
    normalized_power = Column(Float, nullable=True)
    avg_speed_ms = Column(Float, nullable=True)
    max_speed_ms = Column(Float, nullable=True)
    avg_temperature_c = Column(Float, nullable=True)
    calories = Column(Float, nullable=True)
    training_stress_score = Column(Float, nullable=True)
    vo2max_estimate = Column(Float, nullable=True)
    named_route_id = Column(Integer, ForeignKey("named_routes.id", ondelete="SET NULL"), nullable=True)
    polyline = Column(Text, nullable=True)
    bounding_box = Column(JSON, nullable=True)
    source_file = Column(String(512), nullable=True)
    source_type = Column(String(32), nullable=True)
    garmin_activity_id = Column(String(64), nullable=True, unique=True)
    strava_activity_id = Column(String(64), nullable=True, unique=True)
    hr_zones = Column(JSON, nullable=True)
    created_at = Column(DateTime(timezone=True), default=now_utc)

    user = relationship("User", back_populates="activities")
    data_points = relationship("ActivityDataPoint", back_populates="activity", cascade="all, delete-orphan")
    named_route = relationship("NamedRoute", back_populates="activities")
    laps = relationship("ActivityLap", back_populates="activity", cascade="all, delete-orphan")


class ActivityDataPoint(Base):
    __tablename__ = "activity_data_points"

    activity_id = Column(Integer, ForeignKey("activities.id"), nullable=False, primary_key=True)
    timestamp = Column(DateTime(timezone=True), nullable=False, primary_key=True)
    latitude = Column(Float, nullable=True)
    longitude = Column(Float, nullable=True)
    altitude_m = Column(Float, nullable=True)
    heart_rate = Column(Float, nullable=True)
    cadence = Column(Float, nullable=True)
    speed_ms = Column(Float, nullable=True)
    power = Column(Float, nullable=True)
    temperature_c = Column(Float, nullable=True)
    distance_m = Column(Float, nullable=True)

    activity = relationship("Activity", back_populates="data_points")


class ActivityLap(Base):
    __tablename__ = "activity_laps"

    id = Column(Integer, primary_key=True)
    activity_id = Column(Integer, ForeignKey("activities.id"), nullable=False, index=True)
    lap_number = Column(Integer, nullable=False)
    start_time = Column(DateTime(timezone=True), nullable=True)
    duration_s = Column(Float, nullable=True)
    distance_m = Column(Float, nullable=True)
    avg_heart_rate = Column(Float, nullable=True)
    avg_cadence = Column(Float, nullable=True)
    avg_speed_ms = Column(Float, nullable=True)
    avg_power = Column(Float, nullable=True)

    activity = relationship("Activity", back_populates="laps")


class NamedRoute(Base):
    __tablename__ = "named_routes"

    id = Column(Integer, primary_key=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
    name = Column(String(256), nullable=False)
    description = Column(Text, nullable=True)
    sport_type = Column(String(64), nullable=True)
    reference_polyline = Column(Text, nullable=True)
    bounding_box = Column(JSON, nullable=True)
    distance_m = Column(Float, nullable=True)
    auto_detected = Column(Boolean, default=False)
    created_at = Column(DateTime(timezone=True), default=now_utc)

    user = relationship("User", back_populates="named_routes")
    activities = relationship("Activity", back_populates="named_route")
    segments = relationship("RouteSegment", back_populates="route", cascade="all, delete-orphan")


class RouteSegment(Base):
    __tablename__ = "route_segments"

    id = Column(Integer, primary_key=True)
    route_id = Column(Integer, ForeignKey("named_routes.id"), nullable=False, index=True)
    name = Column(String(256), nullable=False)
    start_distance_m = Column(Float, nullable=False)
    end_distance_m = Column(Float, nullable=False)
    description = Column(Text, nullable=True)

    route = relationship("NamedRoute", back_populates="segments")


class PersonalRecord(Base):
    __tablename__ = "personal_records"

    id = Column(Integer, primary_key=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
    activity_id = Column(Integer, ForeignKey("activities.id"), nullable=False)
    sport_type = Column(String(64), nullable=False)
    distance_m = Column(Float, nullable=False)
    distance_label = Column(String(32), nullable=False)
    duration_s = Column(Float, nullable=False)
    achieved_at = Column(DateTime(timezone=True), nullable=False)
    is_current_record = Column(Boolean, default=True)

    __table_args__ = (
        # Uniqueness is enforced at runtime by the partial index uq_pr_current_active
        # (created in init_db), which only covers is_current_record=true rows.
        # The old all-columns UniqueConstraint was dropped because it incorrectly
        # constrained is_current_record=false rows too, causing multi-worker races.
        Index("uq_pr_current_active", "user_id", "sport_type", "distance_m",
              postgresql_where=text("is_current_record = true"), unique=True),
    )


class HealthMetric(Base):
    __tablename__ = "health_metrics"

    id = Column(Integer, primary_key=True)
    user_id = Column(Integer, ForeignKey("users.id"), nullable=False, index=True)
    date = Column(DateTime(timezone=True), nullable=False)
    resting_hr = Column(Float, nullable=True)
    max_hr_day = Column(Float, nullable=True)
    avg_hr_day = Column(Float, nullable=True)
    hrv_status = Column(String(32), nullable=True)
    hrv_nightly_avg = Column(Float, nullable=True)
    hrv_5min_high = Column(Float, nullable=True)
    hrv_5min_low = Column(Float, nullable=True)
    sleep_duration_s = Column(Float, nullable=True)
    sleep_deep_s = Column(Float, nullable=True)
    sleep_light_s = Column(Float, nullable=True)
    sleep_rem_s = Column(Float, nullable=True)
    sleep_awake_s = Column(Float, nullable=True)
    sleep_score = Column(Float, nullable=True)
    sleep_start = Column(DateTime(timezone=True), nullable=True)
    sleep_end = Column(DateTime(timezone=True), nullable=True)
    weight_kg = Column(Float, nullable=True)
    bmi = Column(Float, nullable=True)
    body_fat_pct = Column(Float, nullable=True)
    muscle_mass_kg = Column(Float, nullable=True)
    vo2max = Column(Float, nullable=True)
    fitness_age = Column(Integer, nullable=True)
    training_load = Column(Float, nullable=True)
    recovery_time_h = Column(Float, nullable=True)
    avg_stress = Column(Float, nullable=True)
    steps = Column(Integer, nullable=True)
    floors_climbed = Column(Integer, nullable=True)
    active_calories = Column(Float, nullable=True)
    total_calories = Column(Float, nullable=True)
    spo2_avg = Column(Float, nullable=True)
    intraday_hr = Column(JSON, nullable=True)   # [[epoch_ms, bpm], ...] — not in API list response
    body_battery = Column(JSON, nullable=True)  # {charged,drained,start_level,end_level,values:[[ts_ms,level,type,stress]...]}

    __table_args__ = (
        UniqueConstraint("user_id", "date", name="uq_health_user_date"),
        Index("ix_health_user_date", "user_id", "date"),
    )

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