from datetime import datetime
from typing import Optional, Literal, Dict, Any
import uuid


class Task:
    def __init__(
        self,
        title: str,
        due_date: str,
        description: str = "",
        entity_type: Optional[Literal["client", "prospect", "project", "campaign"]] = None,
        entity_id: Optional[str] = None,
        priority: Literal["basse", "normale", "haute"] = "normale",
        status: Literal["todo", "done", "canceled"] = "todo",
        id: Optional[str] = None,
        created_at: Optional[str] = None,
        completed_at: Optional[str] = None,
        metadata: Optional[Dict[str, Any]] = None,
    ):
        self.id = id or f"tsk_{uuid.uuid4().hex[:8]}"
        self.title = title
        self.description = description
        # due_date: format ISO "YYYY-MM-DD"
        self.due_date = due_date
        self.entity_type = entity_type
        self.entity_id = entity_id
        self.priority = priority
        self.status = status
        now_iso = datetime.utcnow().isoformat()
        self.created_at = created_at or now_iso
        self.completed_at = completed_at
        self.metadata = metadata or {}

    def to_dict(self) -> Dict[str, Any]:
        return {
            "id": self.id,
            "title": self.title,
            "description": self.description,
            "due_date": self.due_date,
            "entity_type": self.entity_type,
            "entity_id": self.entity_id,
            "priority": self.priority,
            "status": self.status,
            "created_at": self.created_at,
            "completed_at": self.completed_at,
            "metadata": self.metadata,
        }

    @staticmethod
    def from_dict(data: Dict[str, Any]) -> "Task":
        return Task(
            id=data.get("id"),
            title=data.get("title", ""),
            description=data.get("description", ""),
            due_date=data.get("due_date", ""),
            entity_type=data.get("entity_type"),
            entity_id=data.get("entity_id"),
            priority=data.get("priority", "normale"),
            status=data.get("status", "todo"),
            created_at=data.get("created_at"),
            completed_at=data.get("completed_at"),
            metadata=data.get("metadata") or {},
        )