use std::collections::HashMap;
use std::fs::File;
use std::io::{BufRead, BufReader};
use std::path::Path;

#[derive(Debug, Clone)]
pub struct Config {
    values: HashMap<String, String>,
}

impl Config {
    pub fn from_file<P: AsRef<Path>>(path: P) -> Result<Self, Box<dyn std::error::Error>> {
        let file = File::open(path)?;
        let reader = BufReader::new(file);

        let mut values = HashMap::new();

        for line in reader.lines() {
            let line = line?;
            if line.trim().is_empty() || line.trim_start().starts_with('#') {
                continue;
            }

            if let Some((key, value)) = line.split_once('=') {
                values.insert(key.trim().to_string(), value.trim().to_string());
            }
        }

        Ok(Self { values })
    }

    pub fn get(&self, key: &str) -> Result<String, String> {
        self.values
            .get(key)
            .cloned()
            .ok_or_else(|| format!("Konfigurationsschlüssel nicht gefunden: {key}"))
    }
}