//! Configuration

use std::net::{SocketAddr, ToSocketAddrs};

use camino::{Utf8Path, Utf8PathBuf};
use confindent::Confindent;
use scurvy::{
	Argument, Scurvy, arg,
	formula::{Boolean, BooleanFormula, Utf8PathFormula},
};
use tracing_subscriber::{EnvFilter, layer::SubscriberExt, util::SubscriberInitExt};

use crate::fs::{RequestPath, SafePathBuf};

/// CLI arguments
///
/// Structure containing values grabbed off the command line,
/// passed in as arguments. Parsed with `scurvy`, so arguments
/// are in the `key=value arg=opt` style
#[derive(Debug)]
pub struct CommandLine {
	conf: Utf8PathBuf,
	refresh_sections: bool,
}

impl CommandLine {
	pub fn get() -> Self {
		let args = vec![
			arg!(["config", "c"] = "path"),
			arg!("refresh-sections" = "bool"),
		];
		let scurv = Scurvy::make(args);

		let conf = scurv.parse_or("config", Utf8PathFormula, "/etc/splorm.conf".into());
		let refresh_sections = *scurv.parse_or("refresh-sections", BooleanFormula, Boolean::No);

		Self {
			conf,
			refresh_sections,
		}
	}

	pub fn conf_path(&self) -> &Utf8Path {
		&self.conf
	}

	pub fn refresh_sections(&self) -> bool {
		self.refresh_sections
	}
}

/// Config values parsed from a file
///
/// This structure is not meant to be passed to routes, that role is filled
/// by [Settings]
///
/// use [Config::get] to create this structure.
#[derive(Debug)]
pub struct Config {
	port: u16,
	settings: Settings,
}

impl Config {
	pub fn get(path: &Utf8Path) -> Config {
		tracing::trace!("loading conf from {path}");
		let confi = Confindent::from_file(path).unwrap();

		let network = confi.child("Network").unwrap();
		let port = network.child_parse("Port").unwrap();

		let serving = confi.child("Serving").unwrap();
		let webroot: Utf8PathBuf = serving.parse().unwrap();
		let hostname = serving.child_owned("Hostname").unwrap();
		let uploads = serving.child_parse("Uploads").unwrap();

		let templates_sec = serving.child("Templates").unwrap();
		let templates: Utf8PathBuf = templates_sec.parse().unwrap();
		let default_template = templates_sec.child_owned("Default").unwrap();

		let opengraph = serving.child("Opengraph").unwrap();
		let og_image = opengraph.child_owned("DefaultImage").unwrap();
		let og_image_alt = opengraph.get_delim("DefaultImage/Text", '/').unwrap();

		let wikarden_sec = serving.child("Wikarden").unwrap();
		let wikarden_root = wikarden_sec.parse().unwrap();
		let wikarden_index = wikarden_sec.child_owned("Index").unwrap();
		let wikarden_gitname = wikarden_sec.child_owned("GitName").unwrap();
		let wikarden_gitemail = wikarden_sec.child_owned("GitEmail").unwrap();

		let me_sec = serving.child("Me").unwrap();
		let me_email = me_sec.child_owned("Email").unwrap();

		let auth_sec = confi.child("Auth").unwrap();
		let allow_registration = auth_sec.child_parse("AllowRegistration").unwrap();

		let database_path = confi.child_parse("Database").unwrap();

		let connectors_sec = confi.child("Connectors").unwrap();
		let gatherer_path: Utf8PathBuf = connectors_sec.child_parse("Gatherer").unwrap();

		Self {
			port,
			settings: Settings {
				default_template,
				template_dir: templates, // webroot.join(templates),

				opengraph: Opengraph {
					image: og_image,
					image_alt: og_image_alt.to_owned(),
				},

				hostname,
				webroot,

				wikarden_root,
				wikarden_index,
				wikarden_gitname,
				wikarden_gitemail,

				me_email,

				allow_registration,

				database_path,

				uploads,
				connectors: Connectors { gatherer_path },
			},
		}
	}

	pub fn listen_address(&self) -> SocketAddr {
		("0.0.0.0", self.port)
			.to_socket_addrs()
			.unwrap()
			.next()
			.unwrap()
	}

	pub fn settings(&self) -> &Settings {
		&self.settings
	}
}

/// Long configuration needed by routes.
///
/// Settings are values that need to live for a long time. This structure
/// should be added to the router as an extension, and be extracted in
/// routes with `Extension(settings): Extension<Settings>`
#[derive(Clone, Debug)]
pub struct Settings {
	webroot: Utf8PathBuf,
	hostname: String,

	default_template: String,
	template_dir: Utf8PathBuf,

	opengraph: Opengraph,

	wikarden_root: Utf8PathBuf,
	wikarden_index: String,
	wikarden_gitname: String,
	wikarden_gitemail: String,

	me_email: String,

	allow_registration: bool,

	database_path: Utf8PathBuf,

	uploads: Utf8PathBuf,
	connectors: Connectors,
}

impl Settings {
	pub fn root(&self) -> &Utf8Path {
		&self.webroot
	}

	pub fn hostname(&self) -> &str {
		&self.hostname
	}

	pub fn template_dir(&self) -> &Utf8Path {
		&self.template_dir
	}

	pub fn quark_template_dir(&self) -> Utf8PathBuf {
		self.template_dir().join("quark")
	}

	pub fn default_template_name(&self) -> &str {
		&self.default_template
	}

	pub fn default_template_path(&self) -> SafePathBuf {
		RequestPath::verify_safe(
			self.template_dir(),
			&format!("{}.html", self.default_template),
		)
		.unwrap()
		.system_path()
		.to_owned()
	}

	pub fn wikarden_root(&self) -> &Utf8Path {
		&self.wikarden_root
	}

	pub fn wikarden_index(&self) -> &str {
		&self.wikarden_index
	}

	pub fn wikarden_gitname(&self) -> &str {
		&self.wikarden_gitname
	}

	pub fn wikarden_gitemail(&self) -> &str {
		&self.wikarden_gitemail
	}

	pub fn me_email(&self) -> &str {
		&self.me_email
	}

	pub fn registration_enabled(&self) -> bool {
		self.allow_registration
	}

	pub fn database_path(&self) -> &Utf8Path {
		&self.database_path
	}

	pub fn opengraph(&self) -> &Opengraph {
		&self.opengraph
	}

	pub fn connectors(&self) -> &Connectors {
		&self.connectors
	}
}

/// Part of [Settings], separate for ease
#[derive(Clone, Debug)]
pub struct Connectors {
	gatherer_path: Utf8PathBuf,
}

impl Connectors {
	pub fn gatherer_path(&self) -> &Utf8Path {
		&self.gatherer_path
	}
}

/// Used by [`main()`][crate::main].
pub fn create_tracing_subscriber() {
	tracing_subscriber::registry()
		.with(tracing_subscriber::fmt::layer())
		.with(
			EnvFilter::try_from_default_env()
				.or_else(|_| EnvFilter::try_new("info"))
				.unwrap(),
		)
		.init();
}

#[derive(Clone, Debug)]
pub struct Opengraph {
	image: String,
	image_alt: String,
}

impl Opengraph {
	pub fn default_image(&self) -> &str {
		&self.image
	}

	pub fn default_image_alt(&self) -> &str {
		&self.image_alt
	}
}