//!	configuration struct and implementations

use std::{
	collections::HashMap,
	env::var,
	fs::{ create_dir, read_to_string, File },
	io::Error,
	path::PathBuf,
	process::exit
};

use tera::Context;
use toml::{
	map::Map,
	Value
};

use crate::error;

///	configuration struct
pub struct Config {
	pub dir: String,
	inner: Map<String, Value>
}

impl Config {
	///	create a new Config using the file at '$HOME/.config/oink/oink.toml'
	pub fn new() -> Config {
		//	get base config dir
		let home = var("HOME").unwrap();
		let mut dir = PathBuf::from(&home);
		dir.push(".config/oink");

		if !dir.exists() {
			println!("missing directory at {dir:?}, creating...");
			let setup = setup_dirs(&dir);
			if setup.is_err() { error::setup_dirs(&dir); }
			println!("created configuration directory, exiting...");
			exit(0);
		}

		//	read toml file
		let mut toml_path = dir.clone();
		toml_path.push("oink.toml");
		let raw = read_to_string(toml_path).unwrap();
		let toml_conf: Value = toml::from_str(&raw).unwrap();
		let inner = toml_conf.as_table().unwrap();

		//	return struct
		Config {
			dir: dir.to_string_lossy().to_string(),
			inner: inner.to_owned()
		}
	}

	///	build tera context from "vars" and "colors" config sections
	pub fn context(&self) -> Context {
		let mut output = Context::new();

		let vars = self.inner.get("vars");
		if vars.is_some() {
			let vars = vars.unwrap().as_table().unwrap();
			for (key, value) in vars.iter() {
				output.insert(key, value.as_str().unwrap());
			}
		}
		let colors = self.inner.get("colors");
		if colors.is_some() {
			let colors = colors.unwrap().as_table().unwrap();
			let mut map = HashMap::<&str, &str>::new();
			for (key, value) in colors.iter() {
				map.insert(key, value.as_str().unwrap());
			}
			output.insert("colors", &map);
		}

		output
	}

	///	build array of targets from "target" array
	pub fn targets(&self) -> Vec<Map<String, Value>> {
		let mut output = Vec::new();

		let target_array: Option<&Value> = self.inner.get("target");
		if target_array.is_some() {
			let target_array = target_array.unwrap().as_array().unwrap().to_owned();
			for target in target_array {
				output.push(target.as_table().unwrap().to_owned());
			}
		}

		output
	}
}

fn setup_dirs(path: &PathBuf) -> Result<(), Error> {
	//	create main directory
	create_dir(path)?;

	//	create template directory
	let mut templates = path.clone();
	templates.push("templates/");
	create_dir(templates)?;

	//	create generated directory
	let mut generated = path.clone();
	generated.push("generated/");
	create_dir(generated)?;

	//	create main toml
	let mut toml = path.clone();
	toml.push("oink.toml");
	File::create(toml)?;

	Ok(())
}