"""Client for ML inference server communication."""
import requests
import cv2
import json
import numpy as np


class InferenceClient:
    """Handles communication with ML inference server."""

    def __init__(self, server_url):
        """
        Initialize inference client.

        Args:
            server_url: Base URL of inference server (e.g., "http://mx-ml.psi.ch:8002")
        """
        self.server_url = server_url

    def predict(self, image, timeout=10):
        """
        Send image to server for prediction.

        Args:
            image: OpenCV image (BGR format)
            timeout: Request timeout in seconds

        Returns:
            List of detection results, or None on error

        Raises:
            requests.RequestException: On connection errors
            ValueError: On invalid response
        """
        _, buf = cv2.imencode('.jpg', image)
        url = f"{self.server_url}/predict/"
        files = {'file': ('image.jpg', buf.tobytes(), 'image/jpeg')}

        response = requests.post(url, files=files, timeout=timeout)

        if response.status_code == 200:
            data = response.json()
            return data.get('results', [])
        else:
            raise ValueError(f"Server returned status {response.status_code}")

    def segment_anything(self, image, x, y, timeout=15):
        """
        Request a high-precision mask from the SAM backend.
        """
        _, buf = cv2.imencode('.jpg', image)
        # Use trailing slash to match the server's /sam/ route exactly
        url = f"{self.server_url.rstrip('/')}/sam/"
        params = {"point_x": int(x), "point_y": int(y)}
        files = {'file': ('image.jpg', buf.tobytes(), 'image/jpeg')}

        response = requests.post(url, files=files, params=params, timeout=timeout)
        
        if response.status_code == 200:
            return response.json()
        else:
            raise ValueError(f"SAM error: {response.status_code} - {response.text}")

    def segment_anything_box(self, image, x1, y1, x2, y2, timeout=15):
        """
        Request a high-precision mask from the SAM backend using a bounding box prompt.
        """
        _, buf = cv2.imencode('.jpg', image)
        url = f"{self.server_url.rstrip('/')}/sam_box/"
        params = {
            "x1": int(x1),
            "y1": int(y1),
            "x2": int(x2),
            "y2": int(y2)
        }
        files = {'file': ('image.jpg', buf.tobytes(), 'image/jpeg')}

        response = requests.post(url, files=files, params=params, timeout=timeout)

        if response.status_code == 200:
            return response.json()
        else:
            raise ValueError(f"SAM Box error: {response.status_code} - {response.text}")

    def segment_multi_box(self, image, boxes, timeout=30):
        """
        Request masks for multiple boxes in one call.
        boxes: List of [x1, y1, x2, y2]
        """
        _, buf = cv2.imencode('.jpg', image)
        url = f"{self.server_url.rstrip('/')}/sam_multi_box/"
        params = {"boxes_json": json.dumps(boxes)}
        files = {'file': ('image.jpg', buf.tobytes(), 'image/jpeg')}

        response = requests.post(url, files=files, params=params, timeout=timeout)
        if response.status_code == 200:
            return response.json().get('results', [])
        else:
            raise ValueError(f"SAM Multi Box error: {response.status_code}")

    def predict_depth(self, image, timeout=20, colorize=True, depth_model=None, depth_max_side=0):
        """
        Request depth map for an image.

        Returns:
            OpenCV image array decoded from PNG response.
        """
        _, buf = cv2.imencode('.jpg', image)
        url = f"{self.server_url.rstrip('/')}/depth/"
        params = {"colorize": "true" if colorize else "false"}
        if depth_model:
            params["depth_model"] = str(depth_model)
        if isinstance(depth_max_side, int) and depth_max_side > 0:
            params["depth_max_side"] = str(depth_max_side)
        files = {'file': ('image.jpg', buf.tobytes(), 'image/jpeg')}

        response = requests.post(url, files=files, params=params, timeout=timeout)
        if response.status_code != 200:
            raise ValueError(f"Depth error: {response.status_code} - {response.text}")
        if "image/png" not in response.headers.get("content-type", ""):
            try:
                err = response.json().get("error", response.text)
            except Exception:
                err = response.text
            raise ValueError(f"Depth error: {err}")

        depth_png = cv2.imdecode(np.frombuffer(response.content, np.uint8), cv2.IMREAD_UNCHANGED)
        if depth_png is None:
            raise ValueError("Depth response decode failed.")
        return depth_png

    def send_training_data(self, image, metadata, timeout=10):
        """
        Send annotated image to training pipeline.

        Args:
            image: OpenCV image (BGR format)
            metadata: Dict containing params and detections
            timeout: Request timeout in seconds

        Returns:
            Response object

        Raises:
            requests.RequestException: On connection errors
        """
        _, buf = cv2.imencode('.jpg', image)
        url = f"{self.server_url}/train/"
        files = {'file': ('img.jpg', buf.tobytes(), 'image/jpeg')}
        data = {"metadata": json.dumps(metadata)}

        response = requests.post(url, files=files, data=data, timeout=timeout)
        response.raise_for_status()
        return response

    def set_server_url(self, url):
        """Update server URL."""
        self.server_url = url

    def get_server_url(self):
        """Get current server URL."""
        return self.server_url