from datetime import datetime
from app import db


class FocusSession(db.Model):
    """Pomodoro-style focus session metadata linked to a time entry.

    Tracks configuration and outcomes for a single focus session so we can
    provide summaries independent of raw time entries.
    """

    __tablename__ = 'focus_sessions'

    id = db.Column(db.Integer, primary_key=True)
    user_id = db.Column(db.Integer, db.ForeignKey('users.id'), nullable=False, index=True)
    project_id = db.Column(db.Integer, db.ForeignKey('projects.id'), nullable=True, index=True)
    task_id = db.Column(db.Integer, db.ForeignKey('tasks.id'), nullable=True, index=True)
    time_entry_id = db.Column(db.Integer, db.ForeignKey('time_entries.id'), nullable=True, index=True)

    # Session timing
    started_at = db.Column(db.DateTime, nullable=False, default=datetime.utcnow)
    ended_at = db.Column(db.DateTime, nullable=True)

    # Pomodoro configuration (minutes)
    pomodoro_length = db.Column(db.Integer, nullable=False, default=25)
    short_break_length = db.Column(db.Integer, nullable=False, default=5)
    long_break_length = db.Column(db.Integer, nullable=False, default=15)
    long_break_interval = db.Column(db.Integer, nullable=False, default=4)

    # Outcomes
    cycles_completed = db.Column(db.Integer, nullable=False, default=0)
    interruptions = db.Column(db.Integer, nullable=False, default=0)
    notes = db.Column(db.Text, nullable=True)

    created_at = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)
    updated_at = db.Column(db.DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)

    def to_dict(self):
        return {
            'id': self.id,
            'user_id': self.user_id,
            'project_id': self.project_id,
            'task_id': self.task_id,
            'time_entry_id': self.time_entry_id,
            'started_at': self.started_at.isoformat() if self.started_at else None,
            'ended_at': self.ended_at.isoformat() if self.ended_at else None,
            'pomodoro_length': self.pomodoro_length,
            'short_break_length': self.short_break_length,
            'long_break_length': self.long_break_length,
            'long_break_interval': self.long_break_interval,
            'cycles_completed': self.cycles_completed,
            'interruptions': self.interruptions,
            'notes': self.notes,
            'created_at': self.created_at.isoformat() if self.created_at else None,
            'updated_at': self.updated_at.isoformat() if self.updated_at else None,
        }