# coding: utf-8

import sys

import requests


def get_metrics_string(url):
    """ get metrics content """
    r = requests.get(url)
    return r.content


def parse_metrics_help(string):
    metrics = []
    lines = string.split("\n")
    for line in lines:
        if line.startswith("# HELP"):
            words = line.split()
            metrics.append((words[2], " ".join(words[3:])))
    return metrics


def save_metrics_help(metrics, name):
    lines = [
        "| metric | help |",
        "| ------ | ---- |",
    ]
    for metric in metrics:
        lines.append("| %s | %s |" % (metric[0], metric[1]))
    lines.append("")
    with open(name, "w+") as f:
        f.write("\n".join(lines))


def main():
    if len(sys.argv) != 3:
        print("Invalid arguments")
        return
    url, name = sys.argv[1:]
    string = get_metrics_string(url)
    metrics = parse_metrics_help(string)
    save_metrics_help(metrics, name)


if __name__ == "__main__":
    main()