import time
import os
import sys
import signal
import faulthandler
from typing import re

import requests
from attrdict import AttrDict
from qbittorrentapi import Client, TorrentStates
from qbittorrentapi.exceptions import APIConnectionError
from prometheus_client import start_http_server
from prometheus_client.core import GaugeMetricFamily, CounterMetricFamily, REGISTRY
import logging
from pythonjsonlogger import jsonlogger

# Enable dumps on stderr in case of segfault
faulthandler.enable()
logger = logging.getLogger()


class QbittorrentMetricsCollector():

    def __init__(self, config):
        self.config = config

    def collect(self):

        metrics = self.get_immich_metrics()

        for metric in metrics:
            name = metric["name"]
            value = metric["value"]
            help_text = metric.get("help", "")
            labels = metric.get("labels", {})
            metric_type = metric.get("type", "gauge")

            if metric_type == "counter":
                prom_metric = CounterMetricFamily(name, help_text, labels=labels.keys())
            else:
                prom_metric = GaugeMetricFamily(name, help_text, labels=labels.keys())
            prom_metric.add_metric(value=value, labels=labels.values())
            yield prom_metric

    def get_immich_metrics(self):
        metrics = []
        metrics.extend(self.get_immich_server_version_number())
       # metrics.extend(self.get_immich_server_info())

        return metrics

    def get_immich_server_info(self):

        try:
            endpoint_server_info = "/api/server-info"
            response_server_info = requests.request(
                "GET",
                self.combine_url(endpoint_server_info),
                headers={'Accept': 'application/json'}
            )
        except requests.exceptions.RequestException as e:
            logger.error(f"Couldn't get server version: {e.error_message}")



        return [
            {
                "name": f"{self.config['metrics_prefix']}_dht_nodes",
                "value": str(response_server_info.json()["diskAvailable"]),
                "help": "Available space on disk",
            },
            {
                "name": f"{self.config['metrics_prefix']}_dl_info_data",
                "value": str(response_server_info.json()["diskSize"]),
                "help": "Disk size",
                #"type": "counter"
            },
            {
                "name": f"{self.config['metrics_prefix']}_up_info_data",
                "value": str(response_server_info.json()["diskUse"]),
                "help": "disk space in use",
                #"type": "counter"
            },
        ]

    def get_immich_server_version_number(self):

        server_version_endpoint = "/api/server-info/version"

        try:

            response_server_version = requests.request(
                "GET",
                self.combine_url(server_version_endpoint),
                headers={'Accept': 'application/json'}
            )
        except requests.exceptions.RequestException as e:
            logger.error(f"Couldn't get server version: {e}")

        server_version_number = ( str(response_server_version.json()["major"]) + "_" +
                                  str(response_server_version.json()["minor"]) + "_" +
                                  str(response_server_version.json()["patch"])
                                  )



        return [
            {
                "name": f"{self.config['metrics_prefix']}_up_info_data",
                "value": server_version_number,
                "help": "server version number",

            }
        ]

    def combine_url(self, api_endpoint):
        base_url = self.config["immich_host"]
        base_url_port = self.config["immich_port"]
        combined_url = base_url + ":" + base_url_port + api_endpoint

        return combined_url



class SignalHandler():
    def __init__(self):
        self.shutdownCount = 0

        # Register signal handler
        signal.signal(signal.SIGINT, self._on_signal_received)
        signal.signal(signal.SIGTERM, self._on_signal_received)

    def is_shutting_down(self):
        return self.shutdownCount > 0

    def _on_signal_received(self, signal, frame):
        if self.shutdownCount > 1:
            logger.warning("Forcibly killing exporter")
            sys.exit(1)
        logger.info("Exporter is shutting down")
        self.shutdownCount += 1


def get_config_value(key, default=""):
    input_path = os.environ.get("FILE__" + key, None)
    if input_path is not None:
        try:
            with open(input_path, "r") as input_file:
                return input_file.read().strip()
        except IOError as e:
            logger.error(f"Unable to read value for {key} from {input_path}: {str(e)}")

    return os.environ.get(key, default)


def main():
    # Init logger so it can be used
    logHandler = logging.StreamHandler()
    formatter = jsonlogger.JsonFormatter(
        "%(asctime) %(levelname) %(message)",
        datefmt="%Y-%m-%d %H:%M:%S"
    )
    logHandler.setFormatter(formatter)
    logger.addHandler(logHandler)
    logger.setLevel("INFO")  # default until config is loaded

    config = {
        "immich_host": get_config_value("IMMICH_HOST", ""),
        "immich_port": get_config_value("IMMICH_PORT", ""),
        "token": get_config_value("IMMICH_API_TOKEN", ""),
        "exporter_port": int(get_config_value("EXPORTER_PORT", "8000")),
        "log_level": get_config_value("EXPORTER_LOG_LEVEL", "INFO"),
        "metrics_prefix": get_config_value("METRICS_PREFIX", "immich"),
    }
    # set level once config has been loaded
    logger.setLevel(config["log_level"])

    # Register signal handler
    signal_handler = SignalHandler()

    if not config["immich_host"]:
        logger.error("No host specified, please set IMMICH_HOST environment variable")
        sys.exit(1)
    if not config["token"]:
        logger.error("No token specified, please set IMMICH_API_TOKEN environment variable")
        sys.exit(1)

    # Register our custom collector
    logger.info("Exporter is starting up")
    REGISTRY.register(QbittorrentMetricsCollector(config))

    # Start server
    start_http_server(config["exporter_port"])
    logger.info(
        f"Exporter listening on port {config['exporter_port']}"
    )

    while not signal_handler.is_shutting_down():
        time.sleep(1)

    logger.info("Exporter has shutdown")