"""
Messenger API - Pydantic Models.

Data models for contacts, conversations, messages, and groups.
"""

from typing import List, Optional

from pydantic import BaseModel, Field


# ==========================================
# CONTACT MODELS
# ==========================================

class ContactBase(BaseModel):
    """Basis-Modell fuer Kontakte."""
    name: str = Field(..., min_length=1, max_length=200)
    email: Optional[str] = None
    phone: Optional[str] = None
    role: str = Field(default="parent", description="parent, teacher, staff, student")
    student_name: Optional[str] = Field(None, description="Name des zugehoerigen Schuelers")
    class_name: Optional[str] = Field(None, description="Klasse z.B. 10a")
    notes: Optional[str] = None
    tags: List[str] = Field(default_factory=list)
    matrix_id: Optional[str] = Field(None, description="Matrix-ID z.B. @user:matrix.org")
    preferred_channel: str = Field(default="email", description="email, matrix, pwa")


class ContactCreate(ContactBase):
    """Model fuer neuen Kontakt."""
    pass


class Contact(ContactBase):
    """Vollstaendiger Kontakt mit ID."""
    id: str
    created_at: str
    updated_at: str
    online: bool = False
    last_seen: Optional[str] = None


class ContactUpdate(BaseModel):
    """Update-Model fuer Kontakte."""
    name: Optional[str] = None
    email: Optional[str] = None
    phone: Optional[str] = None
    role: Optional[str] = None
    student_name: Optional[str] = None
    class_name: Optional[str] = None
    notes: Optional[str] = None
    tags: Optional[List[str]] = None
    matrix_id: Optional[str] = None
    preferred_channel: Optional[str] = None


# ==========================================
# GROUP MODELS
# ==========================================

class GroupBase(BaseModel):
    """Basis-Modell fuer Gruppen."""
    name: str = Field(..., min_length=1, max_length=100)
    description: Optional[str] = None
    group_type: str = Field(default="class", description="class, department, custom")


class GroupCreate(GroupBase):
    """Model fuer neue Gruppe."""
    member_ids: List[str] = Field(default_factory=list)


class Group(GroupBase):
    """Vollstaendige Gruppe mit ID."""
    id: str
    member_ids: List[str] = []
    created_at: str
    updated_at: str


# ==========================================
# MESSAGE MODELS
# ==========================================

class MessageBase(BaseModel):
    """Basis-Modell fuer Nachrichten."""
    content: str = Field(..., min_length=1)
    content_type: str = Field(default="text", description="text, file, image")
    file_url: Optional[str] = None
    send_email: bool = Field(default=False, description="Nachricht auch per Email senden")


class MessageCreate(MessageBase):
    """Model fuer neue Nachricht."""
    conversation_id: str


class Message(MessageBase):
    """Vollstaendige Nachricht mit ID."""
    id: str
    conversation_id: str
    sender_id: str  # "self" fuer eigene Nachrichten
    timestamp: str
    read: bool = False
    read_at: Optional[str] = None
    email_sent: bool = False
    email_sent_at: Optional[str] = None
    email_error: Optional[str] = None


# ==========================================
# CONVERSATION MODELS
# ==========================================

class ConversationBase(BaseModel):
    """Basis-Modell fuer Konversationen."""
    name: Optional[str] = None
    is_group: bool = False


class Conversation(ConversationBase):
    """Vollstaendige Konversation mit ID."""
    id: str
    participant_ids: List[str] = []
    group_id: Optional[str] = None
    created_at: str
    updated_at: str
    last_message: Optional[str] = None
    last_message_time: Optional[str] = None
    unread_count: int = 0


class CSVImportResult(BaseModel):
    """Ergebnis eines CSV-Imports."""
    imported: int
    skipped: int
    errors: List[str]
    contacts: List[Contact]