import os
import sys
import threading
from enum import Enum
from typing import List, Optional

from PySide6.QtCore import QTimer
from PySide6.QtWidgets import QApplication
from fastapi import FastAPI, Query
from pydantic import BaseModel, Field
from uvicorn import Config, Server

from AutoGGUF import AutoGGUF
from Localizations import AUTOGGUF_VERSION

app = FastAPI(
    title="AutoGGUF",
    description="API for AutoGGUF - automatically quant GGUF models",
    version=AUTOGGUF_VERSION,
    license_info={
        "name": "Apache 2.0",
        "url": "https://raw.githubusercontent.com/leafspark/AutoGGUF/main/LICENSE",
    },
)

# Global variable to hold the window reference
window = None


class ModelType(str, Enum):
    single = "single"
    sharded = "sharded"


class Model(BaseModel):
    name: str = Field(..., description="Name of the model")
    type: str = Field(..., description="Type of the model")
    path: str = Field(..., description="Path to the model file")
    size: Optional[int] = Field(None, description="Size of the model in bytes")

    class Config:
        json_schema_extra = {
            "example": {
                "name": "Llama-3.1-8B-Instruct.fp16.gguf",
                "type": "single",
                "path": "Llama-3.1-8B-Instruct.fp16.gguf",
                "size": 13000000000,
            }
        }


class Task(BaseModel):
    id: str = Field(..., description="Unique identifier for the task")
    status: str = Field(..., description="Current status of the task")
    progress: float = Field(..., description="Progress of the task as a percentage")

    class Config:
        json_json_schema_extra = {
            "example": {"id": "task_123", "status": "running", "progress": 75.5}
        }


class Backend(BaseModel):
    name: str = Field(..., description="Name of the backend")
    path: str = Field(..., description="Path to the backend executable")


class Plugin(BaseModel):
    name: str = Field(..., description="Name of the plugin")
    version: str = Field(..., description="Version of the plugin")
    description: str = Field(..., description="Description of the plugin")
    author: str = Field(..., description="Author of the plugin")


@app.get("/v1/models", response_model=List[Model], tags=["Models"])
async def get_models(
    type: Optional[ModelType] = Query(None, description="Filter models by type")
) -> List[Model]:
    """
    Get a list of all available models.

    - **type**: Optional filter for model type

    Returns a list of Model objects containing name, type, path, and optional size.
    """
    if window:
        models = window.get_models_data()
        if type:
            models = [m for m in models if m["type"] == type]

        # Convert to Pydantic models, handling missing 'size' field
        return [Model(**m) for m in models]
    return []


@app.get("/v1/tasks", response_model=List[Task], tags=["Tasks"])
async def get_tasks() -> List[Task]:
    """
    Get a list of all current tasks.

    Returns a list of Task objects containing id, status, and progress.
    """
    if window:
        return window.get_tasks_data()
    return []


@app.get("/v1/health", tags=["System"])
async def health_check() -> dict:
    """
    Check the health status of the API.

    Returns a simple status message indicating the API is alive.
    """
    return {"status": "alive"}


@app.get("/v1/backends", response_model=List[Backend], tags=["System"])
async def get_backends() -> List[Backend]:
    """
    Get a list of all available llama.cpp backends.

    Returns a list of Backend objects containing name and path.
    """
    backends = []
    if window:
        for i in range(window.backend_combo.count()):
            backends.append(
                Backend(
                    name=window.backend_combo.itemText(i),
                    path=window.backend_combo.itemData(i),
                )
            )
    return backends


@app.get("/v1/plugins", response_model=List[Plugin], tags=["System"])
async def get_plugins() -> List[Plugin]:
    """
    Get a list of all installed plugins.

    Returns a list of Plugin objects containing name, version, description, and author.
    """
    if window:
        return [
            Plugin(**plugin_data["data"]) for plugin_data in window.plugins.values()
        ]
    return []


def run_uvicorn() -> None:
    if os.environ.get("AUTOGGUF_SERVER", "").lower() == "enabled":
        config = Config(
            app=app,
            host="127.0.0.1",
            port=int(os.environ.get("AUTOGGUF_SERVER_PORT", 7001)),
            log_level="info",
        )
        server = Server(config)
        server.run()


def main() -> None:
    global window
    qt_app = QApplication(sys.argv)
    window = AutoGGUF(sys.argv)
    window.show()

    # Start Uvicorn in a separate thread after a short delay
    timer = QTimer()
    timer.singleShot(
        100, lambda: threading.Thread(target=run_uvicorn, daemon=True).start()
    )

    sys.exit(qt_app.exec())


if __name__ == "__main__":
    main()