from fastapi import APIRouter, Depends, HTTPException, status, UploadFile, File
from sqlalchemy.ext.asyncio import AsyncSession
import os
import uuid

from rehearsalhub.db.engine import get_session
from rehearsalhub.db.models import Member
from rehearsalhub.dependencies import get_current_member
from rehearsalhub.repositories.member import MemberRepository
from rehearsalhub.schemas.auth import LoginRequest, RegisterRequest, TokenResponse
from rehearsalhub.schemas.member import MemberRead, MemberSettingsUpdate
from rehearsalhub.services.auth import AuthService

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


@router.post("/register", response_model=MemberRead, status_code=status.HTTP_201_CREATED)
async def register(req: RegisterRequest, session: AsyncSession = Depends(get_session)):
    svc = AuthService(session)
    try:
        member = await svc.register(req)
    except ValueError as e:
        raise HTTPException(status_code=status.HTTP_409_CONFLICT, detail=str(e))
    return MemberRead.from_model(member)


@router.post("/login", response_model=TokenResponse)
async def login(req: LoginRequest, session: AsyncSession = Depends(get_session)):
    svc = AuthService(session)
    token = await svc.login(req.email, req.password)
    if token is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid credentials"
        )
    return token


@router.get("/me", response_model=MemberRead)
async def get_me(current_member: Member = Depends(get_current_member)):
    return MemberRead.from_model(current_member)


@router.patch("/me/settings", response_model=MemberRead)
async def update_settings(
    data: MemberSettingsUpdate,
    session: AsyncSession = Depends(get_session),
    current_member: Member = Depends(get_current_member),
):
    print(f"Update settings called for member {current_member.id}")
    print(f"Update data: {data.model_dump()}")
    
    repo = MemberRepository(session)
    updates: dict = {}
    if data.display_name is not None:
        updates["display_name"] = data.display_name
    if data.nc_url is not None:
        updates["nc_url"] = data.nc_url.rstrip("/") if data.nc_url else None
    if data.nc_username is not None:
        updates["nc_username"] = data.nc_username or None
    if data.nc_password is not None:
        updates["nc_password"] = data.nc_password or None
    if data.avatar_url is not None:
        updates["avatar_url"] = data.avatar_url or None

    print(f"Updates to apply: {updates}")
    
    if updates:
        member = await repo.update(current_member, **updates)
        print("Settings updated successfully")
    else:
        member = current_member
        print("No updates to apply")
    return MemberRead.from_model(member)


@router.post("/me/avatar", response_model=MemberRead)
async def upload_avatar(
    file: UploadFile = File(...),
    session: AsyncSession = Depends(get_session),
    current_member: Member = Depends(get_current_member),
):
    """Upload and set user avatar image."""
    print(f"Avatar upload called for member {current_member.id}")
    print(f"File: {file.filename}, Content-Type: {file.content_type}")
    
    # Validate file type
    if not file.content_type.startswith("image/"):
        print("Invalid file type")
        raise HTTPException(
            status_code=status.HTTP_422_UNPROCESSABLE_ENTITY,
            detail="Only image files are allowed (JPG, PNG, GIF, etc.)"
        )
    
    # Validate file size (5MB limit for upload endpoint)
    max_size = 5 * 1024 * 1024  # 5MB
    if file.size > max_size:
        print(f"File too large: {file.size} bytes (max {max_size})")
        raise HTTPException(
            status_code=status.HTTP_413_REQUEST_ENTITY_TOO_LARGE,
            detail=f"File too large. Maximum size is {max_size / 1024 / 1024}MB. Please resize your image and try again."
        )
    
    # Create uploads directory if it doesn't exist
    upload_dir = "uploads/avatars"
    os.makedirs(upload_dir, exist_ok=True)
    print(f"Using upload directory: {upload_dir}")
    
    # Generate unique filename
    file_ext = file.filename.split(".")[-1] if "." in file.filename else "jpg"
    filename = f"{uuid.uuid4()}.{file_ext}"
    file_path = f"{upload_dir}/{filename}"
    
    print(f"Saving file to: {file_path}")
    
    # Save file
    try:
        contents = await file.read()
        print(f"File size: {len(contents)} bytes")
        with open(file_path, "wb") as buffer:
            buffer.write(contents)
        print("File saved successfully")
    except Exception as e:
        print(f"Failed to save file: {str(e)}")
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=f"Failed to save avatar: {str(e)}"
        )
    
    # Update member's avatar URL
    repo = MemberRepository(session)
    avatar_url = f"/api/static/avatars/{filename}"
    print(f"Setting avatar URL to: {avatar_url}")
    member = await repo.update(current_member, avatar_url=avatar_url)
    print("Avatar updated successfully")
    
    return MemberRead.from_model(member)