"""Mail folder management.

Manages collections of messages in named folders
(Inbox, Sent, Drafts, Trash).

Ported from i2p.susi.webmail.WebMail folder handling.
"""

from __future__ import annotations

from dataclasses import dataclass, field

from i2p_apps.susimail.message import MailMessage


@dataclass
class MailFolder:
    """A named folder containing email messages."""
    name: str
    messages: list[MailMessage] = field(default_factory=list)

    def add(self, message: MailMessage) -> None:
        """Add a message to this folder."""
        self.messages.append(message)

    def delete(self, index: int) -> None:
        """Delete a message by index."""
        del self.messages[index]

    @property
    def unread_count(self) -> int:
        return sum(1 for m in self.messages if not m.read)