use std::process::exit;
use crate::package::identifier::PackageIdentifier;
use clap::{Parser, Subcommand};
use log::{debug, error, info, trace, warn};
use manifest::Manifest;
use crate::package::builder::{InstallType, PackageInstaller};
use crate::package::fetch::fetch_package;

#[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,
    #[command(hide = true)]
    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();

                trace!("Fetching package: {}", package_identifier);
                let pkgfile = fetch_package(package_identifier.clone()).unwrap();
                debug!("size: manifest({}kb) data({}kb)", pkgfile.manifest.len() / 1024, pkgfile.data.len() / 1024);
                trace!("parsing manifest");
                let manifest = Manifest::try_from(pkgfile.manifest.clone()).unwrap();
                debug!("manifest pkg name: {}", manifest.package.name);
                trace!("creating installer");
                let installer = PackageInstaller::new(manifest.clone(), pkgfile, if *build { InstallType::Build } else { InstallType::Bin });

                trace!("starting install");
                match installer.install() {
                    Ok(_) => {
                        info!("Sucessfully installed: {}", &manifest.package.name);
                        ()
                    },
                    Err(e) => {
                        error!("{}", e.to_string());
                        exit(1);
                    }
                }
                let unix_end = std::time::SystemTime::now().duration_since(std::time::UNIX_EPOCH).unwrap();
                let end = std::time::Instant::now();
                // float ms
                let duration = (end - start).as_nanos() as f64;
                info!("Install took: {}ms", (duration / 1_000_000.0));
            }
            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::Debug => {
                trace!("Trace message.");
                debug!("Debug message.");
                info!("Info message.");
                warn!("Warning message.");
                error!("Error message.");
                info!("");
                info!("PKGR VERSION: {}", env!("CARGO_PKG_VERSION"));
                info!("PKGR AUTHORS: {}", env!("CARGO_PKG_AUTHORS"));
                info!("PKGR DESCRIPTION: {}", env!("CARGO_PKG_DESCRIPTION"));
                info!("");
                info!("PKGR_LOG_LEVEL: {}", std::env::var("PKGR_LOG_LEVEL").unwrap_or_else(|_| "info".to_string()));
            }
            Command::None => {
                error!("No command was specified.");
            }
        }
    }
}