use gtk::prelude::*;
use std::fs::File;
use std::path::Path;
use std::{fs, slice, str};

use subprocess::{Exec, Redirection};

#[derive(Debug)]
pub enum PacmanWrapper {
    Pak,
    Yay,
    Paru,
    Pacman,
}

#[inline]
pub fn fix_path(path: &str) -> String {
    if !path.starts_with('~') {
        return String::from(path);
    }
    path.replace('~', glib::home_dir().as_path().to_str().unwrap())
}

#[inline]
pub fn read_json(path: &str) -> serde_json::Value {
    let buf = fix_path(path);
    let data = fs::read_to_string(buf).expect("Unable to read file");
    serde_json::from_str(&data).expect("Unable to parse")
}

#[inline]
pub fn write_json(path: &str, content: &serde_json::Value) {
    let output = File::create(fix_path(path)).expect("Unable to open file for writing");
    serde_json::to_writer(output, content).expect("Unable to write json to file");
}

#[inline]
pub const fn const_min(v1: usize, v2: usize) -> usize {
    if v1 <= v2 {
        v1
    } else {
        v2
    }
}

#[inline]
pub const fn string_substr(src_str: &str, pos: usize, n: usize) -> Result<&str, str::Utf8Error> {
    let rlen = const_min(n, src_str.len() - pos);
    let s = unsafe {
        // First, we build a &[u8]...
        let slice = slice::from_raw_parts(src_str.as_ptr().add(pos), rlen);

        // ... and then convert that slice into a string slice
        str::from_utf8(slice)
    };
    s
}

#[inline]
pub fn check_regular_file(path: &str) -> bool {
    let metadata = fs::metadata(path);
    if let Ok(meta) = metadata {
        meta.file_type().is_file()
    } else {
        false
    }
}

pub fn create_combo_with_model(group_store: &gtk::ListStore) -> gtk::ComboBox {
    let group_combo = gtk::ComboBox::with_model(group_store);
    let combo_renderer = gtk::CellRendererText::new();
    group_combo.pack_start(&combo_renderer, true);
    group_combo.add_attribute(&combo_renderer, "text", 0);
    group_combo.set_active(Some(0));

    group_combo
}

pub fn get_translation_msgid(objname: &str) -> &'static str {
    match objname {
        "autostartlabel" => "launch-start-label",
        "development" => "button-development-label",
        "software" => "button-software-label",
        "donate" => "button-donate-label",
        "forum" => "button-forum-label",
        "firstcategory" => "section-docs",
        "secondcategory" => "section-support",
        "thirdcategory" => "section-project",
        "install" => "button-installer-label",
        "installlabel" => "section-installer",
        "involved" => "button-involved-label",
        "readme" => "button-readme-label",
        "release" => "button-release-info-label",
        "welcomelabel" => "welcome-body",
        "welcometitle" => "welcome-title",
        "wiki" => "button-wiki-label",
        _ => panic!("unknown objname '{objname}'!"),
    }
}

pub fn run_cmd_terminal(cmd: String, escalate: bool) -> bool {
    let cmd_formated = format!("{cmd}; read -p 'Press enter to exit'");
    let mut args: Vec<&str> = vec![];
    if escalate {
        args.extend_from_slice(&["-s", "pkexec /usr/share/cachyos-hello/scripts/rootshell.sh"]);
    }
    args.push(cmd_formated.as_str());

    let exit_status = Exec::cmd("/usr/share/cachyos-hello/scripts/terminal-helper")
        .args(args.as_slice())
        .stdout(Redirection::Pipe)
        .join()
        .unwrap();
    exit_status.success()
}

#[inline]
pub fn get_pacman_wrapper() -> PacmanWrapper {
    if Path::new("/sbin/pak").exists() {
        return PacmanWrapper::Pak;
    } else if Path::new("/sbin/yay").exists() {
        return PacmanWrapper::Yay;
    } else if Path::new("/sbin/paru").exists() {
        return PacmanWrapper::Paru;
    }

    PacmanWrapper::Pacman
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn check_file() {
        assert!(check_regular_file("/etc/fstab"));
        assert!(!check_regular_file("/etc"));
    }

    #[test]
    fn check_substr() {
        let text = "The test string is here";
        assert_eq!(string_substr(text, 0, 3).unwrap(), "The");
        assert_eq!(string_substr(text, 4, 4).unwrap(), "test");
        assert_eq!(string_substr(text, 19, 4).unwrap(), "here");
    }

    #[test]
    fn check_min() {
        assert_eq!(const_min(1, 2), 1);
        assert_eq!(const_min(2, 2), 2);
        assert_eq!(const_min(3, 2), 2);
    }
}