# imports - standard imports
import hashlib
import os
import random
import string

# imports - third party imports
import click

# imports - module imports
import bench
import bench.config
from bench.bench import Bench
from bench.utils import get_bench_name


def make_nginx_conf(bench_path, yes=False, logging=None, log_format=None):
	conf_path = os.path.join(bench_path, "config", "nginx.conf")

	if not yes and os.path.exists(conf_path):
		if not click.confirm(
			"nginx.conf already exists and this will overwrite it. Do you want to continue?"
		):
			return

	template = bench.config.env().get_template("nginx.conf")
	bench_path = os.path.abspath(bench_path)
	sites_path = os.path.join(bench_path, "sites")

	config = Bench(bench_path).conf
	sites = prepare_sites(config, bench_path)
	bench_name = get_bench_name(bench_path)

	allow_rate_limiting = config.get("allow_rate_limiting", False)

	template_vars = {
		"sites_path": sites_path,
		"http_timeout": config.get("http_timeout"),
		"sites": sites,
		"webserver_port": config.get("webserver_port"),
		"socketio_port": config.get("socketio_port"),
		"bench_name": bench_name,
		"error_pages": get_error_pages(),
		"allow_rate_limiting": allow_rate_limiting,
		# for nginx map variable
		"random_string": "".join(random.choice(string.ascii_lowercase) for i in range(7)),
	}

	if logging and logging != "none":
		_log_format = ""
		if log_format and log_format != "none":
			_log_format = log_format
		template_vars["logging"] = {"level": logging, "log_format": _log_format}

	if allow_rate_limiting:
		template_vars.update(
			{
				"bench_name_hash": hashlib.sha256(bench_name).hexdigest()[:16],
				"limit_conn_shared_memory": get_limit_conn_shared_memory(),
			}
		)

	nginx_conf = template.render(**template_vars)

	with open(conf_path, "w") as f:
		f.write(nginx_conf)


def make_bench_manager_nginx_conf(bench_path, yes=False, port=23624, domain=None):
	from bench.config.site_config import get_site_config

	template = bench.config.env().get_template("bench_manager_nginx.conf")
	bench_path = os.path.abspath(bench_path)
	sites_path = os.path.join(bench_path, "sites")

	config = Bench(bench_path).conf
	site_config = get_site_config(domain, bench_path=bench_path)
	bench_name = get_bench_name(bench_path)

	template_vars = {
		"port": port,
		"domain": domain,
		"bench_manager_site_name": "bench-manager.local",
		"sites_path": sites_path,
		"http_timeout": config.get("http_timeout"),
		"webserver_port": config.get("webserver_port"),
		"socketio_port": config.get("socketio_port"),
		"bench_name": bench_name,
		"error_pages": get_error_pages(),
		"ssl_certificate": site_config.get("ssl_certificate"),
		"ssl_certificate_key": site_config.get("ssl_certificate_key"),
	}

	bench_manager_nginx_conf = template.render(**template_vars)

	conf_path = os.path.join(bench_path, "config", "nginx.conf")

	if not yes and os.path.exists(conf_path):
		click.confirm(
			"nginx.conf already exists and bench-manager configuration will be appended to it. Do you want to continue?",
			abort=True,
		)

	with open(conf_path, "a") as myfile:
		myfile.write(bench_manager_nginx_conf)


def prepare_sites(config, bench_path):
	sites = {
		"that_use_port": [],
		"that_use_dns": [],
		"that_use_ssl": [],
		"that_use_wildcard_ssl": [],
	}

	domain_map = {}
	ports_in_use = {}

	dns_multitenant = config.get("dns_multitenant")

	shared_port_exception_found = False
	sites_configs = get_sites_with_config(bench_path=bench_path)

	# preload all preset site ports to avoid conflicts

	if not dns_multitenant:
		for site in sites_configs:
			if site.get("port"):
				if not site["port"] in ports_in_use:
					ports_in_use[site["port"]] = []
				ports_in_use[site["port"]].append(site["name"])

	for site in sites_configs:
		if dns_multitenant:
			domain = site.get("domain")

			if domain:
				# when site's folder name is different than domain name
				domain_map[domain] = site["name"]

			site_name = domain or site["name"]

			if site.get("wildcard"):
				sites["that_use_wildcard_ssl"].append(site_name)

				if not sites.get("wildcard_ssl_certificate"):
					sites["wildcard_ssl_certificate"] = site["ssl_certificate"]
					sites["wildcard_ssl_certificate_key"] = site["ssl_certificate_key"]

			elif site.get("ssl_certificate") and site.get("ssl_certificate_key"):
				sites["that_use_ssl"].append(site)

			else:
				sites["that_use_dns"].append(site_name)

		else:
			if not site.get("port"):
				site["port"] = 80
				if site["port"] in ports_in_use:
					site["port"] = 8001
				while site["port"] in ports_in_use:
					site["port"] += 1

			if site["port"] in ports_in_use and not site["name"] in ports_in_use[site["port"]]:
				shared_port_exception_found = True
				ports_in_use[site["port"]].append(site["name"])
			else:
				ports_in_use[site["port"]] = []
				ports_in_use[site["port"]].append(site["name"])

			sites["that_use_port"].append(site)

	if not dns_multitenant and shared_port_exception_found:
		message = "Port conflicts found:"
		port_conflict_index = 0
		for port_number in ports_in_use:
			if len(ports_in_use[port_number]) > 1:
				port_conflict_index += 1
				message += f"\n{port_conflict_index} - Port {port_number} is shared among sites:"
				for site_name in ports_in_use[port_number]:
					message += f" {site_name}"
		raise Exception(message)

	if not dns_multitenant:
		message = "Port configuration list:"
		for site in sites_configs:
			message += f"\n\nSite {site['name']} assigned port: {site['port']}"

		print(message)

	sites["domain_map"] = domain_map

	return sites


def get_sites_with_config(bench_path):
	from bench.bench import Bench
	from bench.config.site_config import get_site_config

	bench = Bench(bench_path)
	sites = bench.sites
	conf = bench.conf
	dns_multitenant = conf.get("dns_multitenant")

	ret = []
	for site in sites:
		try:
			site_config = get_site_config(site, bench_path=bench_path)
		except Exception as e:
			strict_nginx = conf.get("strict_nginx")
			if strict_nginx:
				print(
					f"\n\nERROR: The site config for the site {site} is broken.",
					"If you want this command to pass, instead of just throwing an error,",
					"You may remove the 'strict_nginx' flag from common_site_config.json or set it to 0",
					"\n\n",
				)
				raise e
			else:
				print(
					f"\n\nWARNING: The site config for the site {site} is broken.",
					"If you want this command to fail, instead of just showing a warning,",
					"You may add the 'strict_nginx' flag to common_site_config.json and set it to 1",
					"\n\n",
				)
				continue

		ret.append(
			{
				"name": site,
				"port": site_config.get("nginx_port"),
				"ssl_certificate": site_config.get("ssl_certificate"),
				"ssl_certificate_key": site_config.get("ssl_certificate_key"),
			}
		)

		if dns_multitenant and site_config.get("domains"):
			for domain in site_config.get("domains"):
				# domain can be a string or a dict with 'domain', 'ssl_certificate', 'ssl_certificate_key'
				if isinstance(domain, str):
					domain = {"domain": domain}

				domain["name"] = site
				ret.append(domain)

	use_wildcard_certificate(bench_path, ret)

	return ret


def use_wildcard_certificate(bench_path, ret):
	"""
	stored in common_site_config.json as:
	"wildcard": {
	        "domain": "*.xhiveerp.com",
	        "ssl_certificate": "/path/to/xhiveerp.com.cert",
	        "ssl_certificate_key": "/path/to/xhiveerp.com.key"
	}
	"""
	from bench.bench import Bench

	config = Bench(bench_path).conf
	wildcard = config.get("wildcard")

	if not wildcard:
		return

	domain = wildcard["domain"]
	ssl_certificate = wildcard["ssl_certificate"]
	ssl_certificate_key = wildcard["ssl_certificate_key"]

	# If domain is set as "*" all domains will be included
	if domain.startswith("*"):
		domain = domain[1:]
	else:
		domain = "." + domain

	for site in ret:
		if site.get("ssl_certificate"):
			continue

		if (site.get("domain") or site["name"]).endswith(domain):
			# example: ends with .xhiveerp.com
			site["ssl_certificate"] = ssl_certificate
			site["ssl_certificate_key"] = ssl_certificate_key
			site["wildcard"] = 1


def get_error_pages():
	bench_app_path = os.path.abspath(bench.__path__[0])
	templates = os.path.join(bench_app_path, "config", "templates")

	return {502: os.path.join(templates, "502.html")}


def get_limit_conn_shared_memory():
	"""Allocate 2 percent of total virtual memory as shared memory for nginx limit_conn_zone"""
	total_vm = (os.sysconf("SC_PAGE_SIZE") * os.sysconf("SC_PHYS_PAGES")) / (
		1024 * 1024
	)  # in MB

	return int(0.02 * total_vm)