use std::process::exit;

use clap::{Parser, Subcommand};
use log::{debug, error, info, trace, warn};

use colored::Colorize;
use crate::CONFIG;
use crate::package::identifier::PackageIdentifier;
use crate::package::Package;
use crate::process::Process;
use crate::types::fetch::TryFetch;

#[derive(Parser, Debug)]
#[clap(name = "pkgr", version)]
pub struct Cli {
    #[command(subcommand)]
    pub command: Command,
}

#[derive(Subcommand, Debug)]
pub enum Command {
    /// Install a package
    Install {
        #[arg(short, long, default_value_t = false)]
        build: bool,
        package_identifier: PackageIdentifier,
    },
    /// Remove a package from the system
    Remove {
        /// Remove the package from index too
        #[arg(short, long, default_value_t = false)]
        index: bool,
        package_identifier: PackageIdentifier,
    },
    /// List packages
    List {
        /// List installed packages
        #[arg(short, long, default_value_t = true)]
        installed: bool,
    },
    /// Update packages on the system
    Update,
    /// Get info about pkgr
    Info {
        #[arg(short, long, default_value_t = false)]
        detailed: bool
    },
    #[cfg(debug_assertions)]
    Debug,
    #[command(hide = true)]
    None,
}

impl Command {
    pub fn execute(&self) {
        match self {
            Command::Install {
                build,
                package_identifier,
            } => {
                warn!("Installer does not run in isolation.");

                let start = std::time::Instant::now();
                let _unix_start = std::time::SystemTime::now()
                    .duration_since(std::time::UNIX_EPOCH)
                    .unwrap();

                info!("Parsing package...");
                trace!("Fetching package: {:?}", package_identifier);
                let mut pkg = Package::try_fetch(package_identifier.clone()).unwrap();
                debug!("manifest size: {}kb", pkg.pkgfile.manifest.len() / 1024);
                debug!("files size: {}kb", pkg.pkgfile.data.len() / 1024);

                trace!("Checking if package is installed...");
                if pkg.is_installed() {
                    error!("Package is already installed.");
                    exit(1);
                }

                trace!("Starting install...");
                match pkg.install(CONFIG.with(|c| if !*build { c.build_by_default } else { *build })) {
                    Ok(_) => (),
                    Err(e) => {
                        error!("Install failed: {}", e.to_string());
                        exit(1);
                    }
                }

                let end = std::time::Instant::now();
                let _unix_end = std::time::SystemTime::now()
                    .duration_since(std::time::UNIX_EPOCH)
                    .unwrap();

                let duration = end.duration_since(start);

                info!("Install complete.");
                info!("Install took {}ms.", duration.as_nanos() as f64 / 1000000.0);
            }
            Command::Remove {
                package_identifier,
                index,
            } => {
                if let PackageIdentifier::URI(_) = package_identifier {
                    error!("URI is unsupported when removing applications.");
                    exit(1);
                }
                info!("Index: {}", index);
                info!("Package identifier: {}", package_identifier);
            }
            Command::List { installed: _ } => {
                error!("List is not yet implemented.");
            }
            Command::Update => {
                error!("Update is not yet implemented.");
            }
            Command::Info {
                detailed
            } => {
                info!("Welcome to pkgr!\n\
                {}\n\
                To get help please run \"{} -h\"", env!("CARGO_PKG_DESCRIPTION"), std::env::args().nth(0).unwrap());
                if *detailed {
                    info!("");
                    info!("version: {}", env!("CARGO_PKG_VERSION"));
                    info!("authors: {}", env!("CARGO_PKG_AUTHORS"));

                    info!("");
                    info!("If you can't seem to figure something out, use environment variable: PKGR_LOG_LEVEL=debug");
                    trace!("{}", "The trace log level should really only be used by PKGR devs.".red());
                }
            }
            #[cfg(debug_assertions)]
            Command::Debug => {
                trace!("Trace message.\nWith newline.");
                debug!("Debug message.\nWith newline.");
                info!("Info message.\nWith newline.");
                warn!("Warning message.\nWith newline.");
                error!("Error message.\nWith newline.");

                info!("");
                Process::command(vec!["sh", "-c", "echo whoami: $(whoami)"])
                    .spawn()
                    .unwrap();
                if let Ok(_user) = std::env::var("SUDO_USER") {
                    Process::command(vec!["sh", "-c", "echo sudo_user: $SUDO_USER"])
                        .spawn()
                        .unwrap();
                }

                info!("");
                info!(
                    "PKGR_LOG_LEVEL: {}",
                    std::env::var("PKGR_LOG_LEVEL").unwrap_or_else(|_| "info".to_string())
                );
            }
            Command::None => {
                error!("No command was specified.");
            }
        }
    }
}