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use std::env;
use std::collections::HashMap;
use std::process::Command;


// Parse CLI arguments
//---------------------------
const DEFINED_ARGS: [(&str, bool); 5] = [
    ("install" , false),
    ("data", true),
    ("po", true),
    ("prefix"  , true),
    ("verbose" , false)
];

pub fn parse_varargs<'a>() -> HashMap<&'a str, String> {
    let args: Vec<String> = env::args().collect();
    let mut parsed_map: HashMap<&str, String> = HashMap::new();

    for param in args {
        for arg in DEFINED_ARGS.iter() {
            if param[2..].starts_with(arg.0)  {
                if arg.1 == false {
                    &parsed_map
                        .insert(arg.0, "true".to_string());
                } else if param.contains('=') {
                    &parsed_map
                        .insert(arg.0, param[arg.0.len()+3..].to_string());
                } else {
                    println!("Error parsing argument!");
                    std::process::exit(1)
                }
            }
        }
    }

    if parsed_map.len() == 0 {
        println!("No argument passed!");
        std::process::exit(1)
    }

    parsed_map
}


pub fn get_pkg_metadata() ->  HashMap<String, String> {
    let cmd = Command::new("cargo")
        .arg("metadata")
        .arg("--format-version=1")
        .arg(format!("--manifest-path={}", "Cargo.toml"))
        .output()
        .expect("failed to execute mkdir");

    let output = String::from_utf8_lossy(&cmd.stdout);
    let parsed = json::parse(&output).expect("Error getting metadata")
        ["packages"][0]["metadata"]["pkg"].to_owned();

    let mut variables = HashMap::<String, String>::new();
    for (k, v) in parsed.entries() {
        if let Some(value) = v.as_str().map(String::from) {
            variables.insert(
                k.to_uppercase(),
                value
            );
        }
        
    };

    variables
}


pub fn locale_files(
    po_dir: &str,
    locale_dir: &str
) -> Result<(), std::io::Error> {

    let entries = std::fs::read_dir(po_dir)?
        .map(|res| res.map(|e| e.file_name().into_string().unwrap().replace(".po", "")))
        .collect::<Result<Vec<_>, std::io::Error>>()?;

    for name in entries {
        if !name.contains("LINGUAS") && !name.contains("POTFILES") {
            let msgs_dir = &format!("{0}/{1}/LC_MESSAGES", locale_dir, name);
            std::fs::create_dir_all(&msgs_dir).expect("Error creating directory!");
            Command::new("msgfmt").args(&[
                &format!("{}/{}.po", po_dir, name),
                "-o"
            ]).arg(&format!("{}/{}.po", msgs_dir, name))
            .status().expect("Error executing msgfmt");
        }
    }

    Ok(())
}

pub fn gschema_file(
    in_path: &str,
    out_path: &str,
    schema_path: &str,
    map: &HashMap<String, String>
) {
    process_config_file(in_path, out_path, map);
    Command::new("glib-compile-schemas").args(&[
        schema_path,
    ]).status().expect("Error executing glib-compile-resources");
}

pub fn gresource_file(
    in_path: &str,
    out_path: &str,
    resource_dir: &str,
    map: &HashMap<String, String>
) {
    process_config_file(in_path, in_path, map);
    Command::new("glib-compile-resources").args(&[
        in_path,
        "--sourcedir",
        resource_dir,
        "--internal",
        "--generate",
        "--target",
        out_path
    ]).status().expect("Error executing glib-compile-resources");
}

pub fn appdata_file(
    in_path: &str,
    out_path: &str,
    po_dir: &str,
    map: &HashMap<String, String>
) {
    let tmp_file = &format!("{}.in", out_path);
    process_config_file(in_path, tmp_file, map);
    Command::new("msgfmt").args(&[
        "--xml",
        "--template",
        tmp_file,
        "-d", po_dir,
        "-o", out_path,
    ]).status().expect("Error executing msgfmt");

    std::fs::remove_file(tmp_file)
        .expect("Error removing temp appdata file");
}

pub fn desktop_file(
    in_path: &str,
    out_path: &str,
    po_dir: &str,
    map: &HashMap<String, String>
) {
    let tmp_file = &format!("{}.in", out_path);
    process_config_file(in_path, tmp_file, map);
    Command::new("msgfmt").args(&[
        "--desktop",
        "--template",
        tmp_file,
        "-d", po_dir,
        "-o", out_path
    ]).status().expect("Error executing msgfmt");

    std::fs::remove_file(tmp_file)
        .expect("Error removing temp desktop file");
}

pub fn process_config_file(
    from: &str,
    to: &str,
    map: &HashMap<String, String>) {

    let mut data = std::fs::read_to_string(&from)
        .expect("Unable to read file.");

    
    for (key, value) in map.iter() {   
        data = data.replace(key, &value);
    };

    std::fs::write(&to, data)
        .expect("Unable to write to file.");
}