use distro::OSConfig;
use error::{AppError, AppResult};
use scripting::{
    loader::ScriptLoader,
    script::{NuScript, Script},
};
use tasks::*;

pub mod error;
pub(crate) mod scripting;
pub mod tasks;
pub(crate) mod utils;
pub use utils::generate_script_files;
pub mod distro;
pub mod task;

#[derive(Clone, Copy, Debug, PartialEq, PartialOrd)]
pub enum TaskOperation {
    Up,
    Down,
}

pub struct TaskExecutor {
    config: Option<OSConfig>,
    loader: ScriptLoader,
}

macro_rules! task_executors {
    ($($function:ident => $task:ident),+) => {
       $(
            #[tracing::instrument(level = "trace", skip(self))]
            pub async fn $function(&self, operation: TaskOperation, cfg: <$task as crate::tasks::Task>::Config) -> AppResult<()> {
                match operation {
                    TaskOperation::Up => self.execute_task::<<$task as crate::tasks::Task>::UpScript>(cfg).await,
                    TaskOperation::Down => self.execute_task::<<$task as crate::tasks::Task>::DownScript>(cfg).await,
                }
            }
        )+
    }
}

impl TaskExecutor {
    /// Creates a new task executor with a given config
    pub fn with_config(config: OSConfig) -> Self {
        Self {
            config: Some(config),
            loader: ScriptLoader::new(),
        }
    }

    task_executors!(
        setup_users => SetupUsersTask,
        configure_network => ConfigureNetworkTask,
        configure_unakite => ConfigureUnakiteTask,
        create_partitions => CreatePartitionsTask,
        install_base => InstallBaseTask,
        install_bootloader => InstallBootloaderTask,
        install_desktop => InstallDesktopTask,
        install_extra_packages => InstallExtraPackagesTask,
        install_flatpak => InstallFlatpakTask,
        install_kernels => InstallKernelsTask,
        install_timeshift => InstallTimeshiftTask,
        install_zramd => InstallZRamDTask,
        setup_root_user => SetupRootUserTask,
        configure_locale => ConfigureLocaleTask
    );

    /// Installs the system from the given system configuration
    #[tracing::instrument(level = "trace", skip(self))]
    pub async fn install_from_config(&self) -> AppResult<()> {
        let config = self.config.clone().ok_or(AppError::MissingConfig)?;
        let base_config = config.base;

        self.create_partitions(TaskOperation::Up, base_config.partitions)
            .await?;
        self.install_base(TaskOperation::Up, ()).await?;
        self.install_kernels(TaskOperation::Up, base_config.kernels)
            .await?;
        self.install_bootloader(TaskOperation::Up, base_config.bootloader)
            .await?;
        self.configure_locale(TaskOperation::Up, base_config.locale)
            .await?;
        self.configure_network(TaskOperation::Up, base_config.network)
            .await?;

        if base_config.enable_zramd {
            self.install_zramd(TaskOperation::Up, ()).await?;
        }
        if base_config.enable_timeshift {
            self.install_timeshift(TaskOperation::Up, ()).await?;
        }
        if base_config.enable_flatpak {
            self.install_flatpak(TaskOperation::Up, ()).await?;
        }
        self.setup_users(TaskOperation::Up, base_config.users)
            .await?;
        self.setup_root_user(TaskOperation::Up, base_config.root_user)
            .await?;
        self.install_desktop(TaskOperation::Up, base_config.desktop)
            .await?;
        self.install_extra_packages(TaskOperation::Up, base_config.extra_packages)
            .await?;

        if let Some(unakite) = base_config.unakite {
            self.configure_unakite(TaskOperation::Up, unakite).await?;
        }

        Ok(())
    }

    async fn execute_task<S: Script>(&self, args: S::Args) -> AppResult<()> {
        let script = self.loader.load::<S>()?;
        self.execute(script, args.clone()).await?;

        Ok(())
    }

    #[inline]
    async fn execute<S: Script>(&self, mut script: NuScript<S>, args: S::Args) -> AppResult<()> {
        if let Some(cfg) = self.config.as_ref() {
            script.set_global_var("TRM_CONFIG", cfg.to_owned())
        } else {
            script.set_global_var("TRM_CONFIG", OSConfig::empty())
        }
        .set_global_var("TRM_VERSION", env!("CARGO_PKG_VERSION"))
        .execute(args)
        .await
    }
}