import os
from datetime import datetime, timedelta
from typing import Any, Dict, List, Optional, Tuple

import cv2
import numpy as np


def draw_bbox(
    image: np.ndarray,
    bbox: List[float],
    label: str = "",
    color: Tuple[int, int, int] = (0, 255, 0),
    thickness: int = 2,
) -> np.ndarray:
    x1, y1, x2, y2 = [int(v) for v in bbox]
    cv2.rectangle(image, (x1, y1), (x2, y2), color, thickness)

    if label:
        (text_width, text_height), baseline = cv2.getTextSize(
            label, cv2.FONT_HERSHEY_SIMPLEX, 0.5, thickness
        )
        cv2.rectangle(
            image,
            (x1, y1 - text_height - 10),
            (x1 + text_width + 10, y1),
            color,
            -1,
        )
        cv2.putText(
            image,
            label,
            (x1 + 5, y1 - 5),
            cv2.FONT_HERSHEY_SIMPLEX,
            0.5,
            (0, 0, 0),
            thickness,
        )

    return image


def draw_roi(
    image: np.ndarray,
    points: List[List[float]],
    roi_type: str = "polygon",
    color: Tuple[int, int, int] = (255, 0, 0),
    thickness: int = 2,
    label: str = "",
) -> np.ndarray:
    points = np.array(points, dtype=np.int32)

    if roi_type == "polygon":
        cv2.polylines(image, [points], True, color, thickness)
        cv2.fillPoly(image, [points], color=(color[0], color[1], color[2], 30))
    elif roi_type == "line":
        cv2.line(image, tuple(points[0]), tuple(points[1]), color, thickness)
    elif roi_type == "rectangle":
        x1, y1 = points[0]
        x2, y2 = points[1]
        cv2.rectangle(image, (x1, y1), (x2, y2), color, thickness)

    if label:
        cx = int(np.mean(points[:, 0]))
        cy = int(np.mean(points[:, 1]))
        cv2.putText(
            image,
            label,
            (cx, cy),
            cv2.FONT_HERSHEY_SIMPLEX,
            0.7,
            color,
            thickness,
        )

    return image


def draw_detections(
    image: np.ndarray,
    detections: List[Dict[str, Any]],
    roi_configs: Optional[List[Dict[str, Any]]] = None,
) -> np.ndarray:
    result = image.copy()

    for detection in detections:
        bbox = detection.get("bbox", [])
        conf = detection.get("conf", 0.0)
        cls = detection.get("cls", 0)

        label = f"Person: {conf:.2f}"
        color = (0, 255, 0)

        if roi_configs:
            matched_rois = detection.get("matched_rois", [])
            for roi_conf in matched_rois:
                if roi_conf.get("enabled", True):
                    roi_points = roi_conf.get("points", [])
                    roi_type = roi_conf.get("type", "polygon")
                    roi_label = roi_conf.get("name", "")
                    roi_color = (255, 0, 0) if roi_conf.get("rule") == "intrusion" else (0, 165, 255)
                    result = draw_roi(result, roi_points, roi_type, roi_color, 2, roi_label)

        result = draw_bbox(result, bbox, label, color, 2)

    return result


def resize_image(
    image: np.ndarray,
    max_size: int = 480,
    maintain_aspect: bool = True,
) -> np.ndarray:
    h, w = image.shape[:2]

    if maintain_aspect:
        scale = min(max_size / h, max_size / w)
        new_h, new_w = int(h * scale), int(w * scale)
    else:
        new_h, new_w = max_size, max_size
        scale = max_size / max(h, w)

    result = cv2.resize(image, (new_w, new_h), interpolation=cv2.INTER_AREA)
    return result, scale


def encode_image_base64(image: np.ndarray, quality: int = 85) -> str:
    _, buffer = cv2.imencode(".jpg", image, [cv2.IMWRITE_JPEG_QUALITY, quality])
    return base64.b64encode(buffer).decode("utf-8")


def decode_image_base64(data: str) -> np.ndarray:
    import base64
    buffer = base64.b64decode(data)
    nparr = np.frombuffer(buffer, np.uint8)
    return cv2.imdecode(nparr, cv2.IMREAD_COLOR)


def get_timestamp_str() -> str:
    return datetime.now().strftime("%Y%m%d_%H%M%S")


def format_duration(seconds: float) -> str:
    if seconds < 60:
        return f"{int(seconds)}秒"
    elif seconds < 3600:
        minutes = int(seconds // 60)
        secs = int(seconds % 60)
        return f"{minutes}分{secs}秒"
    else:
        hours = int(seconds // 3600)
        minutes = int((seconds % 3600) // 60)
        return f"{hours}小时{minutes}分"


def is_time_in_ranges(
    current_time: datetime,
    time_ranges: List[Dict[str, List[int]]],
) -> bool:
    if not time_ranges:
        return True

    current_minutes = current_time.hour * 60 + current_time.minute

    for time_range in time_ranges:
        start = time_range["start"]
        end = time_range["end"]
        start_minutes = start[0] * 60 + start[1]
        end_minutes = end[0] * 60 + end[1]

        if start_minutes <= current_minutes < end_minutes:
            return True

    return False


class FPSCounter:
    def __init__(self, window_size: int = 30):
        self.timestamps: List[float] = []
        self.window_size = window_size

    def update(self):
        import time
        now = time.time()
        self.timestamps.append(now)
        self.timestamps = self.timestamps[-self.window_size:]

    @property
    def fps(self) -> float:
        if len(self.timestamps) < 2:
            return 0.0
        elapsed = self.timestamps[-1] - self.timestamps[0]
        if elapsed <= 0:
            return 0.0
        return (len(self.timestamps) - 1) / elapsed