"""Session model definition."""
from pydantic import BaseModel, Field
from datetime import datetime
from typing import Optional


class Session(BaseModel):
    """Represents a work session on a project."""

    id: str
    project_slug: str
    started_at: datetime
    ended_at: Optional[datetime] = None
    duration_minutes: Optional[int] = None
    objective: str = ""
    summary: str = ""
    work_done: list[str] = Field(default_factory=list)
    changes: list[str] = Field(default_factory=list)
    decisions: list[str] = Field(default_factory=list)
    blockers: list[str] = Field(default_factory=list)
    next_steps: list[str] = Field(default_factory=list)
    references: list[str] = Field(default_factory=list)
    raw_notes: list[dict] = Field(default_factory=list)  # [{"type": "work", "text": "...", "timestamp": "..."}]