use anyhow::Result;
use colored::Colorize;
use crate::{ ConfigManager, config::Host, input, platform::{ Platform, PlatformKey } };
use dialoguer::{ Select, Input, Confirm, theme::ColorfulTheme };
use ssh2_config::{ SshConfig, ParseRule };
use ssh_key::PrivateKey;
use std::fs;
use std::io;
use tui::{ backend::TermionBackend, Terminal };


fn new_config(host: String, user: String, port: i16, keyid: PlatformKey) -> String {
    format!(r#"# Generated by Keyman

Host {host}
        HostName {host}
        User {user}
        Port {port}
        IdentityFile {}
"#, keyid.file)
}

impl Platform {
    // New host
    pub fn ssh_new_host(&self, config: &mut ConfigManager) -> Result<Host> {
        println!(" ## Creating new SSH host entry ## ");
        let keyid = input::get_key(config, self.to_owned())?;

        let userhost = loop {
            let inp: String = Input::with_theme(&ColorfulTheme::default())
                .with_prompt("User@Host")
                .interact_text()?;

            let split = inp.split("@");
            let split: Vec<String> = split.map(|a| a.to_string()).collect();

            if split.len() < 2 {
                println!("{} Example: paul@example.com:34 - <user>@<host>[:port]", "Incorrect user@host given.".red());
            } else {
                break split
            }
        };

        let user: String = userhost.get(0).unwrap().to_string();
        let mut host: String = userhost.get(1).unwrap().to_string();
        let mut port: i16 = 22;

        let _host = host.to_owned();
        let h: Vec<&str> = _host.split(":").collect();

        if h.len() > 1 {
            let portstr = h.get(1).unwrap();
            port = i16::from_str_radix(portstr, 10)?;
            host = h.get(0).unwrap().to_string();
        }

        let config_dir = config.config_dir.join("hosts/").join(host.to_owned());
        fs::create_dir_all(config_dir.to_owned()).expect(&format!("Couldnt create_dir_all on {:?}", config_dir.to_owned()));
        let config_file = config_dir.join("config");

        fs::write(config_file.to_owned(), new_config(host.to_owned(), user.to_owned(), port, keyid.to_owned())).expect(&format!("Couldn't write config at {:?}", config_file.to_owned()));

        Ok(Host {
            platform: Platform::SSH,
            id: keyid.file,
            user,
            host,
            port,
            config: config_file.to_owned().to_string_lossy().to_string()
        })
    }

    // Get keys
    pub fn ssh_get_keys(&self, config: &ConfigManager) -> Vec<PlatformKey> {
        let mut keys = vec![];
        let Ok(dir) = std::fs::read_dir(config.search_path.to_owned()) else { panic!("Couldn't read {:?}", config.search_path.to_owned()) };

        for file in dir {
            let Ok(f) = file else { continue };

            match PrivateKey::read_openssh_file(&f.path()) {
                Ok(p) => keys.push(PlatformKey {
                    file: format!("{}", f.path().to_string_lossy()),
                    display: format!("{}: {}", p.fingerprint(ssh_key::HashAlg::Sha256), f.file_name().to_string_lossy())
                }),
                // Not a private key
                Err(_) => continue
            };
        }

        keys
    }

    // Run
    pub fn ssh_run(&self, host: &mut Host, config: &mut ConfigManager, term: &mut Terminal<TermionBackend<io::Stdout>>) -> Result<()> {
        Ok(loop {
            let action = Select::with_theme(&ColorfulTheme::default())
                .with_prompt(format!("{}@{}", host.user.to_owned(), host.host.to_owned()))
                .item("Connect")
                .item("Edit config")
                .item("Edit definition")
                .item("Delete")
                .item("Back")
                .default(0)
                .interact()?;

            term.clear()?;
            match action {
                
                // Connect
                0 => {
                    // TODO: clear screen before connect
                    std::process::Command::new("ssh")
                        .arg("-F")
                        .arg(host.config.to_owned())
                        .arg(host.host.to_owned()).spawn()?.wait()?;
                }
                
                
                // Edit config
                1 => {
                    let t = input::edit_temp_from_file(&host.config)?;
                    
                    // Validate SSH config
                    let mut file = std::io::BufReader::new(fs::File::open(&t)?);
                    if let Err(e) = SshConfig::default().parse(&mut file, ParseRule::STRICT) {
                        println!(" ## {}: {} ## ", "Rejecting config".red(), e)
                    } else {
                        println!(" ## {} ## ", "Config OK".green());
                        fs::copy(&t, &host.config)?;
                    }
                }
                
                
                // Edit definition
                2 => {
                    let edited_host = host.edit(config)?;
                    host.clone_from(&edited_host);
                }
                
                
                
                // Delete
                3 => {
                    let confirm = Confirm::with_theme(&ColorfulTheme::default())
                        .with_prompt("Are you sure you want to delete this definition?")
                        .default(false)
                        .interact()?;

                    if confirm {
                        let mut conf = std::path::PathBuf::from(host.config.to_owned());
                        conf.pop();

                        config.remove(host);
                        fs::remove_dir_all(conf)?;
                        break;
                    }
                }
                
                
                // Back
                _ => break
            }
        })
    }
}