import glob
import os
import shutil
from datetime import datetime
from pathlib import Path

import cv2
import numpy as np

from .component import Component


class VisionSaver(Component):
    def __init__(self, config=None, name=None):
        super().__init__(config=config, name=name, threaded=False)

    def config_changed(self):
        self.location = Path(self.config[self.name]["path"])
        os.makedirs(self.location, exist_ok=True)
        self.mask_zones = self.config[self.name].get("mask_zones", None)
        self.minimum_disk_free_space_gb = self.config[self.name].get("minimum_disk_free_space_gb", None)
        if self.minimum_disk_free_space_gb is not None:
            self.minimum_disk_free_space_gb = float(self.minimum_disk_free_space_gb)
        self.time_format = self.config[self.name]["time_format"]

    def save(self, save_time, img, mask=True):
        timestamp = datetime.fromtimestamp(save_time).strftime(self.time_format)
        save_dir = self.location / save_time.strftime("%Y") / save_time.strftime("%m")
        os.makedirs(save_dir, exist_ok=True)
        out_path = save_dir / f"{timestamp}.png"
        self.log.info(f"saving {out_path}")
        img = cv2.cvtColor(img, cv2.COLOR_RGB2BGR)
        if mask and self.mask_zones is not None:
            height, width, channels = img.shape
            out = np.full(
                [height, width, channels],
                [0] * channels
            )
            for zone_name in self.mask_zones:
                zone = self.bench.zones[zone_name]["box"]
                out[zone[1]:zone[3], zone[0]:zone[2]] = img[zone[1]:zone[3], zone[0]:zone[2]]
        else:
            out = img
        cv2.imwrite(out_path, out)
        return out_path

    def remove_older_images_if_needed(self):
        if self.minimum_disk_free_space_gb is None:
            return
        minimum_disk_free_bytes = self.minimum_disk_free_space_gb * 10**9
        archive = os.path.abspath(self.location)
        free = shutil.disk_usage(archive)[-1]
        if free < minimum_disk_free_bytes:
            self.log.warning(f"LOW DISK SPACE {(free / 10 ** 9):3.2f}GB/{(minimum_disk_free_bytes / 10 ** 9):3.2f}GB), removing older vision saves")
            sections = sorted([os.path.dirname(section) for section in glob.glob(f"{archive}/*/")])
            years = sorted({os.path.basename(os.path.dirname(year)) for section in sections for year in glob.glob(f"{section}/*/")})
            while free < minimum_disk_free_bytes and len(years) > 0:
                year = years.pop(0)
                months = sorted({os.path.basename(os.path.dirname(month)) for section in sections for month in glob.glob(f"{section}/{year}/*/")})
                while free < minimum_disk_free_bytes and len(months) > 0:
                    month = months.pop(0)
                    for section in sections:
                        self.log.info(f"REMOVING '{section}/{year}/{month}'")
                        shutil.rmtree(f"{section}/{year}/{month}", ignore_errors=True)
                    free = shutil.disk_usage(archive)[-1]
                if len(months) == 0:
                    for section in sections:
                        self.log.info(f"REMOVING '{section}/{year}'")
                        shutil.rmtree(f"{section}/{year}", ignore_errors=True)
                    free = shutil.disk_usage(archive)[-1]