"""
BreakPilot Jitsi API

Ermoeglicht das Versenden von Jitsi-Meeting-Einladungen per Email.
"""

import os
import uuid
from datetime import datetime
from typing import Optional, List
from pydantic import BaseModel, Field

from fastapi import APIRouter, HTTPException

router = APIRouter(prefix="/api/jitsi", tags=["Jitsi"])

# Standard Jitsi Server (kann konfiguriert werden)
JITSI_SERVER = os.getenv("JITSI_SERVER", "https://meet.jit.si")


# ==========================================
# PYDANTIC MODELS
# ==========================================

class JitsiInvitation(BaseModel):
    """Model fuer Jitsi-Meeting-Einladung."""
    to_email: str = Field(..., description="Email-Adresse des Teilnehmers")
    to_name: str = Field(..., description="Name des Teilnehmers")
    organizer_name: str = Field(default="BreakPilot Lehrer", description="Name des Organisators")
    meeting_title: str = Field(..., description="Titel des Meetings")
    meeting_date: str = Field(..., description="Datum z.B. '20. Dezember 2024'")
    meeting_time: str = Field(..., description="Uhrzeit z.B. '14:00 Uhr'")
    room_name: Optional[str] = Field(None, description="Raumname (wird generiert wenn leer)")
    additional_info: Optional[str] = Field(None, description="Zusaetzliche Informationen")


class JitsiInvitationResponse(BaseModel):
    """Antwort auf eine Jitsi-Einladung."""
    success: bool
    jitsi_url: str
    room_name: str
    email_sent: bool
    email_error: Optional[str] = None


class JitsiBulkInvitation(BaseModel):
    """Model fuer mehrere Jitsi-Einladungen."""
    recipients: List[dict] = Field(..., description="Liste von {email, name} Objekten")
    organizer_name: str = Field(default="BreakPilot Lehrer")
    meeting_title: str
    meeting_date: str
    meeting_time: str
    room_name: Optional[str] = None
    additional_info: Optional[str] = None


class JitsiBulkResponse(BaseModel):
    """Antwort auf Bulk-Einladungen."""
    jitsi_url: str
    room_name: str
    sent: int
    failed: int
    errors: List[str]


# ==========================================
# HELPER FUNCTIONS
# ==========================================

def generate_room_name() -> str:
    """Generiert einen sicheren Raumnamen."""
    # UUID-basiert fuer Sicherheit
    unique_id = uuid.uuid4().hex[:12]
    return f"BreakPilot-{unique_id}"


def build_jitsi_url(room_name: str) -> str:
    """Erstellt die vollstaendige Jitsi-URL."""
    return f"{JITSI_SERVER}/{room_name}"


# ==========================================
# API ENDPOINTS
# ==========================================

@router.post("/invite", response_model=JitsiInvitationResponse)
async def send_jitsi_invitation(invitation: JitsiInvitation):
    """
    Sendet eine Jitsi-Meeting-Einladung per Email.

    Der Empfaenger kann dem Meeting ueber den Browser beitreten,
    ohne Matrix oder andere Software installieren zu muessen.
    """
    # Raumname generieren oder verwenden
    room_name = invitation.room_name or generate_room_name()
    jitsi_url = build_jitsi_url(room_name)

    email_sent = False
    email_error = None

    try:
        from email_service import email_service

        result = email_service.send_jitsi_invitation(
            to_email=invitation.to_email,
            to_name=invitation.to_name,
            organizer_name=invitation.organizer_name,
            meeting_title=invitation.meeting_title,
            meeting_date=invitation.meeting_date,
            meeting_time=invitation.meeting_time,
            jitsi_url=jitsi_url,
            additional_info=invitation.additional_info
        )

        email_sent = result.success
        if not result.success:
            email_error = result.error

    except Exception as e:
        email_error = str(e)

    return JitsiInvitationResponse(
        success=email_sent,
        jitsi_url=jitsi_url,
        room_name=room_name,
        email_sent=email_sent,
        email_error=email_error
    )


@router.post("/invite/bulk", response_model=JitsiBulkResponse)
async def send_bulk_jitsi_invitations(bulk: JitsiBulkInvitation):
    """
    Sendet Jitsi-Einladungen an mehrere Empfaenger.

    Alle Empfaenger erhalten eine Einladung zum selben Meeting.
    """
    # Gemeinsamer Raumname fuer alle
    room_name = bulk.room_name or generate_room_name()
    jitsi_url = build_jitsi_url(room_name)

    sent = 0
    failed = 0
    errors = []

    try:
        from email_service import email_service

        for recipient in bulk.recipients:
            if not recipient.get("email"):
                errors.append(f"Fehlende Email fuer {recipient.get('name', 'Unbekannt')}")
                failed += 1
                continue

            result = email_service.send_jitsi_invitation(
                to_email=recipient["email"],
                to_name=recipient.get("name", ""),
                organizer_name=bulk.organizer_name,
                meeting_title=bulk.meeting_title,
                meeting_date=bulk.meeting_date,
                meeting_time=bulk.meeting_time,
                jitsi_url=jitsi_url,
                additional_info=bulk.additional_info
            )

            if result.success:
                sent += 1
            else:
                failed += 1
                errors.append(f"{recipient.get('email')}: {result.error}")

    except Exception as e:
        errors.append(f"Allgemeiner Fehler: {str(e)}")

    return JitsiBulkResponse(
        jitsi_url=jitsi_url,
        room_name=room_name,
        sent=sent,
        failed=failed,
        errors=errors[:20]  # Max 20 Fehler zurueckgeben
    )


@router.get("/room")
async def generate_meeting_room():
    """
    Generiert einen neuen Meeting-Raum.

    Gibt die URL zurueck ohne Einladungen zu senden.
    """
    room_name = generate_room_name()
    jitsi_url = build_jitsi_url(room_name)

    return {
        "room_name": room_name,
        "jitsi_url": jitsi_url,
        "server": JITSI_SERVER,
        "created_at": datetime.utcnow().isoformat()
    }