# NOTE: To generate self-signed certs use: `openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout ./privkey.pem -out ./fullchain.pem`
# For dhparams: `openssl dhparam -out ./ssl-dhparam.pem 4096`
# Example for options-ssl-nginx.conf:
# ```
# ssl_session_cache shared:le_nginx_SSL:10m;
# ssl_session_timeout 1440m;
# ssl_protocols TLSv1.2 TLSv1.3;
# ssl_prefer_server_ciphers off;
# ssl_ciphers "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384";
# ```
# For certbot to generate new keys: `certbot certonly --manual --manual-public-ip-logging-ok --preferred-challenges dns-01 --server https://acme-v02.api.letsencrypt.org/directory -d "*.voronind.com" -d voronind.com`
{ util, container, pkgs, lib, config, ... } @args: with lib; let
	cfg = config.container.module.proxy;
	virtualHosts = util.catSet (util.ls ./proxy/host) args;
in {
	options = {
		container.module.proxy = {
			enable = mkEnableOption "Proxy server.";
			address = mkOption {
				default = "10.1.0.2";
				type    = types.str;
			};
			port = mkOption {
				default = 443;
				type    = types.int;
			};
			storage = mkOption {
				default = "${config.container.storage}/proxy";
				type    = types.str;
			};
		};
	};

	config = mkIf cfg.enable {
		systemd.tmpfiles.rules = container.mkContainerDir cfg [
			"challenge"
			"letsencrypt"
		];

		containers.proxy = container.mkContainer cfg {
			bindMounts = {
				"/etc/letsencrypt" = {
					hostPath   = "${cfg.storage}/letsencrypt";
					isReadOnly = false;
				};
				"/var/www/.well-known" = {
					hostPath   = "${cfg.storage}/challenge";
					isReadOnly = false;
				};
			};

			config = { ... }: container.mkContainerConfig cfg {
				environment.systemPackages = with pkgs; [ certbot ];

				services.nginx = {
					inherit virtualHosts;

					enable = true;
					recommendedOptimisation  = true;
					recommendedProxySettings = true;
					clientMaxBodySize = "1024m";
					appendConfig = util.trimTabs ''
						worker_processes 4;
					'';
					eventsConfig = util.trimTabs ''
						worker_connections 4096;
					'';
					# TODO: Fix 80 redirect and 403 default.
					appendHttpConfig = util.trimTabs ''
						server {
							server_name default_server;
							listen 80;

							location / {
								return 301 https://$host$request_uri;
							}
						}

						map $http_accept_language $resume {
							default https://git.${config.container.domain}/voronind/resume/releases/download/latest/voronind_en.pdf;
							~ru     https://git.${config.container.domain}/voronind/resume/releases/download/latest/voronind_ru.pdf;
						}

						server {
							server_name ${config.container.domain};
							listen 443 ssl;

							ssl_certificate /etc/letsencrypt/live/${config.container.domain}/fullchain.pem;
							ssl_certificate_key /etc/letsencrypt/live/${config.container.domain}/privkey.pem;
							include /etc/letsencrypt/conf/options-ssl-nginx.conf;
							ssl_dhparam /etc/letsencrypt/conf/ssl-dhparams.pem;

							return 301 $resume;
						}

						server {
							listen 443 ssl default_server;
							server_name _;

							ssl_certificate /etc/letsencrypt/live/${config.container.domain}/fullchain.pem;
							ssl_certificate_key /etc/letsencrypt/live/${config.container.domain}/privkey.pem;
							include /etc/letsencrypt/conf/options-ssl-nginx.conf;
							ssl_dhparam /etc/letsencrypt/conf/ssl-dhparams.pem;

							return 403;
						}
					'';
				};
			};
		};
	};
}