"""
Meetings API Module
Backend API endpoints for Jitsi Meet integration
"""
import os
import uuid
import httpx
from datetime import datetime, timedelta
from typing import Optional, List
from fastapi import APIRouter, HTTPException, Depends
from pydantic import BaseModel, EmailStr

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


# ============================================
# Configuration
# ============================================

JITSI_BASE_URL = os.getenv("JITSI_PUBLIC_URL", "http://localhost:8443")
CONSENT_SERVICE_URL = os.getenv("CONSENT_SERVICE_URL", "http://localhost:8081")


# ============================================
# Models
# ============================================

class MeetingConfig(BaseModel):
    enable_lobby: bool = True
    enable_recording: bool = False
    start_with_audio_muted: bool = True
    start_with_video_muted: bool = False
    require_display_name: bool = True
    enable_breakout: bool = False


class CreateMeetingRequest(BaseModel):
    type: str = "quick"  # quick, scheduled, training, parent, class
    title: str = "Neues Meeting"
    duration: int = 60
    scheduled_at: Optional[str] = None
    config: Optional[MeetingConfig] = None
    description: Optional[str] = None
    invites: Optional[List[str]] = None


class ScheduleMeetingRequest(BaseModel):
    title: str
    scheduled_at: str
    duration: int = 60
    description: Optional[str] = None
    invites: Optional[List[str]] = None


class TrainingRequest(BaseModel):
    title: str
    description: Optional[str] = None
    scheduled_at: str
    duration: int = 120
    max_participants: int = 20
    trainer: str
    config: Optional[MeetingConfig] = None


class ParentTeacherRequest(BaseModel):
    student_name: str
    parent_name: str
    parent_email: Optional[str] = None
    scheduled_at: str
    reason: Optional[str] = None
    send_invite: bool = True
    duration: int = 30


class MeetingResponse(BaseModel):
    room_name: str
    join_url: str
    moderator_url: Optional[str] = None
    password: Optional[str] = None
    expires_at: Optional[str] = None


class MeetingStats(BaseModel):
    active: int = 0
    scheduled: int = 0
    recordings: int = 0
    participants: int = 0


class ActiveMeeting(BaseModel):
    room_name: str
    title: str
    participants: int
    started_at: str


# ============================================
# In-Memory Storage (for demo purposes)
# In production, use database
# ============================================

scheduled_meetings = []
active_meetings = []
trainings = []
recordings = []


# ============================================
# Helper Functions
# ============================================

def generate_room_name(prefix: str = "meeting") -> str:
    """Generate a unique room name"""
    return f"{prefix}-{uuid.uuid4().hex[:8]}"


def generate_password() -> str:
    """Generate a simple password"""
    return uuid.uuid4().hex[:8]


def build_jitsi_url(room_name: str, config: Optional[MeetingConfig] = None) -> str:
    """Build Jitsi meeting URL with config parameters"""
    params = []

    if config:
        if config.start_with_audio_muted:
            params.append("config.startWithAudioMuted=true")
        if config.start_with_video_muted:
            params.append("config.startWithVideoMuted=true")
        if config.require_display_name:
            params.append("config.requireDisplayName=true")

    # Common config
    params.extend([
        "config.prejoinPageEnabled=false",
        "config.disableDeepLinking=true",
        "config.defaultLanguage=de",
        "interfaceConfig.SHOW_JITSI_WATERMARK=false",
        "interfaceConfig.SHOW_BRAND_WATERMARK=false"
    ])

    url = f"{JITSI_BASE_URL}/{room_name}"
    if params:
        url += "#" + "&".join(params)

    return url


async def call_consent_service(endpoint: str, method: str = "GET", data: dict = None) -> dict:
    """Call the consent service API"""
    async with httpx.AsyncClient() as client:
        url = f"{CONSENT_SERVICE_URL}{endpoint}"

        if method == "GET":
            response = await client.get(url)
        elif method == "POST":
            response = await client.post(url, json=data)
        else:
            raise ValueError(f"Unsupported method: {method}")

        if response.status_code >= 400:
            return None

        return response.json()


# ============================================
# API Endpoints
# ============================================

@router.get("/stats", response_model=MeetingStats)
async def get_meeting_stats():
    """Get meeting statistics"""
    return MeetingStats(
        active=len(active_meetings),
        scheduled=len(scheduled_meetings),
        recordings=len(recordings),
        participants=sum(m.get("participants", 0) for m in active_meetings)
    )


@router.get("/active", response_model=List[ActiveMeeting])
async def get_active_meetings():
    """Get list of active meetings"""
    return [
        ActiveMeeting(
            room_name=m["room_name"],
            title=m["title"],
            participants=m.get("participants", 0),
            started_at=m.get("started_at", datetime.now().isoformat())
        )
        for m in active_meetings
    ]


@router.post("/create", response_model=MeetingResponse)
async def create_meeting(request: CreateMeetingRequest):
    """Create a new meeting"""
    config = request.config or MeetingConfig()

    # Generate room name based on type
    if request.type == "quick":
        room_name = generate_room_name("quick")
    elif request.type == "training":
        room_name = generate_room_name("schulung")
    elif request.type == "parent":
        room_name = generate_room_name("elterngespraech")
    elif request.type == "class":
        room_name = generate_room_name("klasse")
    else:
        room_name = generate_room_name("meeting")

    join_url = build_jitsi_url(room_name, config)

    # Store meeting if scheduled
    if request.scheduled_at:
        scheduled_meetings.append({
            "room_name": room_name,
            "title": request.title,
            "scheduled_at": request.scheduled_at,
            "duration": request.duration,
            "config": config.model_dump() if config else None
        })

    return MeetingResponse(
        room_name=room_name,
        join_url=join_url
    )


@router.post("/schedule", response_model=MeetingResponse)
async def schedule_meeting(request: ScheduleMeetingRequest):
    """Schedule a new meeting"""
    room_name = generate_room_name("meeting")

    meeting = {
        "room_name": room_name,
        "title": request.title,
        "scheduled_at": request.scheduled_at,
        "duration": request.duration,
        "description": request.description,
        "invites": request.invites or []
    }

    scheduled_meetings.append(meeting)

    join_url = build_jitsi_url(room_name)

    # TODO: Send email invites if configured

    return MeetingResponse(
        room_name=room_name,
        join_url=join_url
    )


@router.post("/training", response_model=MeetingResponse)
async def create_training(request: TrainingRequest):
    """Create a training session"""
    # Generate room name from title
    title_slug = request.title.lower().replace(" ", "-")[:20]
    room_name = f"schulung-{title_slug}-{uuid.uuid4().hex[:4]}"

    config = request.config or MeetingConfig(
        enable_lobby=True,
        enable_recording=True,
        start_with_audio_muted=True
    )

    training = {
        "room_name": room_name,
        "title": request.title,
        "description": request.description,
        "scheduled_at": request.scheduled_at,
        "duration": request.duration,
        "max_participants": request.max_participants,
        "trainer": request.trainer,
        "config": config.model_dump()
    }

    trainings.append(training)
    scheduled_meetings.append(training)

    join_url = build_jitsi_url(room_name, config)

    return MeetingResponse(
        room_name=room_name,
        join_url=join_url
    )


@router.post("/parent-teacher", response_model=MeetingResponse)
async def create_parent_teacher_meeting(request: ParentTeacherRequest):
    """Create a parent-teacher meeting"""
    # Generate room name with student name and date
    student_slug = request.student_name.lower().replace(" ", "-")[:15]
    date_str = datetime.fromisoformat(request.scheduled_at).strftime("%Y%m%d-%H%M")
    room_name = f"elterngespraech-{student_slug}-{date_str}"

    # Generate password for security
    password = generate_password()

    config = MeetingConfig(
        enable_lobby=True,
        enable_recording=False,
        start_with_audio_muted=False
    )

    meeting = {
        "room_name": room_name,
        "title": f"Elterngespräch - {request.student_name}",
        "student_name": request.student_name,
        "parent_name": request.parent_name,
        "parent_email": request.parent_email,
        "scheduled_at": request.scheduled_at,
        "duration": request.duration,
        "reason": request.reason,
        "password": password,
        "config": config.model_dump()
    }

    scheduled_meetings.append(meeting)

    join_url = build_jitsi_url(room_name, config)

    # TODO: Send email invite to parents if configured

    return MeetingResponse(
        room_name=room_name,
        join_url=join_url,
        password=password
    )


@router.get("/scheduled")
async def get_scheduled_meetings():
    """Get all scheduled meetings"""
    return scheduled_meetings


@router.get("/trainings")
async def get_trainings():
    """Get all training sessions"""
    return trainings


@router.delete("/{room_name}")
async def delete_meeting(room_name: str):
    """Delete a scheduled meeting"""
    # Find and remove the meeting (in-place modification)
    for i, m in enumerate(scheduled_meetings):
        if m["room_name"] == room_name:
            scheduled_meetings.pop(i)
            break
    return {"status": "deleted"}


# ============================================
# Recording Endpoints
# ============================================

@router.get("/recordings")
async def get_recordings():
    """Get list of recordings"""
    # Demo data
    return [
        {
            "id": "docker-basics",
            "title": "Docker Grundlagen Schulung",
            "date": "2025-12-10T10:00:00",
            "duration": "1:30:00",
            "size_mb": 156,
            "participants": 15
        },
        {
            "id": "team-kw49",
            "title": "Team-Meeting KW 49",
            "date": "2025-12-06T14:00:00",
            "duration": "1:00:00",
            "size_mb": 98,
            "participants": 8
        },
        {
            "id": "parent-mueller",
            "title": "Elterngespräch - Max Müller",
            "date": "2025-12-02T16:00:00",
            "duration": "0:28:00",
            "size_mb": 42,
            "participants": 2
        }
    ]


@router.get("/recordings/{recording_id}")
async def get_recording(recording_id: str):
    """Get recording details"""
    return {
        "id": recording_id,
        "title": "Recording " + recording_id,
        "date": "2025-12-10T10:00:00",
        "duration": "1:30:00",
        "size_mb": 156,
        "download_url": f"/api/recordings/{recording_id}/download"
    }


@router.get("/recordings/{recording_id}/download")
async def download_recording(recording_id: str):
    """Download a recording"""
    # In production, this would stream the actual file
    raise HTTPException(status_code=404, detail="Recording file not found (demo mode)")


@router.delete("/recordings/{recording_id}")
async def delete_recording(recording_id: str):
    """Delete a recording"""
    return {"status": "deleted", "id": recording_id}


# ============================================
# Health Check
# ============================================

@router.get("/health")
async def health_check():
    """Check meetings service health"""
    # Check Jitsi availability
    jitsi_healthy = False
    try:
        async with httpx.AsyncClient(timeout=5.0) as client:
            response = await client.get(JITSI_BASE_URL)
            jitsi_healthy = response.status_code == 200
    except Exception:
        pass

    return {
        "status": "healthy" if jitsi_healthy else "degraded",
        "jitsi_url": JITSI_BASE_URL,
        "jitsi_available": jitsi_healthy,
        "scheduled_meetings": len(scheduled_meetings),
        "active_meetings": len(active_meetings)
    }