from typing import Dict, Any, Optional, List
from fastapi import APIRouter, HTTPException
from pydantic import BaseModel
import backend.models.gateway as gateway_module

router = APIRouter(prefix="/v1/models", tags=["Model Gateway"])

class RegisterProviderRequest(BaseModel):
    provider_id: str
    provider_type: str
    config: Dict[str, Any]

class GenerateRequest(BaseModel):
    model: str
    prompt: str
    providers: Optional[List[str]] = None
    kwargs: Optional[Dict[str, Any]] = None

@router.post("/providers")
async def register_provider(req: RegisterProviderRequest):
    if gateway_module.model_gateway is None:
        raise HTTPException(503, "Model gateway not initialized")
    try:
        gateway_module.model_gateway.register_provider(req.provider_id, req.provider_type, req.config)
        return {"status": "registered", "provider_id": req.provider_id}
    except ValueError as e:
        raise HTTPException(400, str(e))

@router.get("/providers")
async def list_providers():
    if gateway_module.model_gateway is None:
        raise HTTPException(503, "Model gateway not initialized")
    providers = gateway_module.model_gateway.list_providers()
    return {"providers": providers}

@router.post("/generate")
async def generate(req: GenerateRequest):
    if gateway_module.model_gateway is None:
        raise HTTPException(503, "Model gateway not initialized")
    try:
        result = await gateway_module.model_gateway.generate(
            req.model, req.prompt, req.providers, **(req.kwargs or {})
        )
        return result
    except Exception as e:
        raise HTTPException(500, str(e))

@router.get("/calls/{call_id}")
async def get_call(call_id: str):
    if gateway_module.model_gateway is None:
        raise HTTPException(503, "Model gateway not initialized")
    call = await gateway_module.model_gateway.get_call(call_id)
    if not call:
        raise HTTPException(404, "Call not found")
    return call

@router.get("/calls")
async def get_calls(limit: int = 20):
    if gateway_module.model_gateway is None:
        raise HTTPException(503, "Model gateway not initialized")
    calls = await gateway_module.model_gateway.get_calls(limit)
    return {"calls": calls}