use std::fs::File;
use std::io;
use std::io::BufRead;
use std::collections::HashMap;

pub struct IniFile {
	// section_name, key, list of values
	pub sections : HashMap<String, HashMap<String, Vec<String>>>	
}

impl IniFile {
	pub fn from_file(path : &str) -> Result<IniFile, io::Error> {
		let mut file : HashMap<String, HashMap<String,Vec<String>>>  = HashMap::new();
		let fd = File::open(path)?;
		let reader = io::BufReader::new(fd);
		let mut current_section = String::from("");
		
		for line in reader.lines() {
			let line = line?;
			let line = line.trim().to_string();
			
			if line.starts_with("#") || line.is_empty() {
				println!("kommentar or empts: {}", line);
				continue;
			}
			// another section begins
			if line.starts_with("[") && line.ends_with("]") {
				let nam = line.get(1..(line.len()-1));
				let n;
				match nam {
					Some(sec_name) => n = sec_name,
					// TODO no name given, what should be done
					None => n = ""
				}
				current_section = n.to_string();
				// TODO maybe the sections has been specified twice?
				file.insert(n.to_string(), HashMap::new() );
				continue;

			}
			let kv : Vec<&str> = line.split("=").collect();
			let mut key = String::from("");
			if let Some(t) = kv.get(0) {
				key = t.to_string();
			}
			let mut value = String::from("");
			if let Some(t) = kv.get(1) {
				value = t.to_string();
			}
			println!("key: {}, value: {}", key, value);
			if let Some(section) = file.get_mut(&current_section) {
				println!("found current section");
				// get the values for key in section current_section
				let mut hack_first = true;
				if let Some(ent) = section.get_mut(&key) {
					println!("found key in map");
					ent.push(value.to_string());
					hack_first = false;
				}
				if hack_first {
					let mut new = Vec::new();
					new.push(value.to_string());
					section.insert(key, new);
					// TODO create new HashMap and insert
					println!("inserted new one");
				}
			}
		}
		Ok(IniFile { sections : file })
	}

}