from fastapi import APIRouter, HTTPException
from ..schemas import ModelLoadRequest, ModelInfo
from ..model_manager import model_manager
import os
from pathlib import Path

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

@router.post("/load", response_model=ModelInfo)
async def load_model(req: ModelLoadRequest):
    try:
        info = model_manager.load_model(
            model_path=req.model_path,
            dtype=req.dtype,
            quantization=req.quantization,
            device_map=req.device_map,
            offload_folder=req.offload_folder,
            trust_remote_code=req.trust_remote_code
        )
        if info.status == "error":
            raise HTTPException(status_code=500, detail=info.error)
        return info
    except FileNotFoundError as e:
        raise HTTPException(status_code=404, detail=str(e))
    except NotADirectoryError as e:
        raise HTTPException(status_code=400, detail=str(e))
    except Exception as e:
        # If already error in info
        if model_manager.info.status == "error":
            raise HTTPException(status_code=500, detail=model_manager.info.error)
        raise HTTPException(status_code=500, detail=str(e))

@router.get("/status", response_model=ModelInfo)
async def get_status():
    return model_manager.get_status()

@router.get("/info", response_model=ModelInfo)
async def get_info():
    return model_manager.get_status()

@router.delete("/unload", response_model=ModelInfo)
async def unload_model():
    return model_manager.unload()

@router.get("/validate")
async def validate_path(path: str):
    p = Path(path)
    if not p.exists():
        return {"valid": False, "reason": "المسار غير موجود", "exists": False}
    if not p.is_dir():
        return {"valid": False, "reason": "المسار ليس مجلداً", "exists": True}
    s_files = list(p.glob("*.safetensors"))
    has_config = (p / "config.json").exists()
    has_tokenizer = (p / "tokenizer.json").exists() or (p / "tokenizer_config.json").exists()
    has_model_index = (p / "model.safetensors.index.json").exists()
    details = {
        "safetensors_count": len(s_files),
        "safetensors_files": [f.name for f in s_files],
        "has_config": has_config,
        "has_tokenizer": has_tokenizer,
        "has_model_index": has_model_index,
        "total_size_mb": round(sum(f.stat().st_size for f in s_files) / (1024*1024), 1) if s_files else 0
    }
    valid = len(s_files) > 0 and has_config
    reason = "صالح للتحميل" if valid else "يجب أن يحتوي المجلد على ملفات .safetensors و config.json"
    return {"valid": valid, "reason": reason, "details": details}

@router.get("/list")
async def list_local_models(base_path: str = ""):
    # Optional: list subfolders that look like models
    if not base_path or not Path(base_path).exists():
        return {"models": []}
    base = Path(base_path)
    models = []
    for child in base.iterdir():
        if child.is_dir():
            s_files = list(child.glob("*.safetensors"))
            has_config = (child / "config.json").exists()
            if s_files:
                models.append({
                    "path": str(child),
                    "name": child.name,
                    "safetensors_count": len(s_files),
                    "has_config": has_config,
                    "size_mb": round(sum(f.stat().st_size for f in s_files)/(1024*1024),1)
                })
    return {"models": models}