use std::ffi::OsString;
use std::io;

use lazaret_core::protocol::PRIVATE_CLIENT_BOOTSTRAP_ROLE;
use lazaret_ignored_workspace::{PRIVATE_ROUTER_ROLE, dispatch_private_router};
use lazaret_linux::private_role::{PrivateRole, PrivateRoleRegistry};
use lazaret_linux::process::{PRIVATE_PROCESS_ROLE, dispatch_private_process_role};
use lazaret_runtime_supervisor::supervision::{
    PRIVATE_RUNTIME_ROLE, dispatch_private_runtime_role,
};
use lazaret_state_anchor::{
    PRIVATE_STATE_ANCHOR_RECOVERY_ROLE, dispatch_private_state_anchor_recovery,
};

use crate::client_bootstrap::dispatch_private_client_bootstrap;
use crate::sandbox_init::{
    PRIVATE_SANDBOX_INIT_ROLE, PRIVATE_SESSION_EXEC_ROLE, PRIVATE_SESSION_IDENTITY_ROLE,
    dispatch_private_sandbox_init,
};

fn sandbox_init(arguments: &[OsString]) -> Option<io::Result<()>> {
    dispatch_exact(PRIVATE_SANDBOX_INIT_ROLE, arguments)
}

fn client_bootstrap(arguments: &[OsString]) -> Option<io::Result<()>> {
    dispatch_private_client_bootstrap(arguments)
        .map(|result| result.map_err(|error| io::Error::other(error.to_string())))
}

fn session_exec(arguments: &[OsString]) -> Option<io::Result<()>> {
    dispatch_exact(PRIVATE_SESSION_EXEC_ROLE, arguments)
}

fn session_identity(arguments: &[OsString]) -> Option<io::Result<()>> {
    dispatch_exact(PRIVATE_SESSION_IDENTITY_ROLE, arguments)
}

fn dispatch_exact(role: &str, arguments: &[OsString]) -> Option<io::Result<()>> {
    (arguments.first() == Some(&OsString::from(role))).then(|| {
        dispatch_private_sandbox_init(arguments)
            .unwrap_or_else(|| Err(io::Error::other("private role arguments are malformed")))
    })
}

static ROLES: [PrivateRole; 8] = [
    PrivateRole::new(PRIVATE_CLIENT_BOOTSTRAP_ROLE, client_bootstrap),
    PrivateRole::new(PRIVATE_SANDBOX_INIT_ROLE, sandbox_init),
    PrivateRole::new(PRIVATE_SESSION_EXEC_ROLE, session_exec),
    PrivateRole::new(PRIVATE_SESSION_IDENTITY_ROLE, session_identity),
    PrivateRole::new(
        PRIVATE_STATE_ANCHOR_RECOVERY_ROLE,
        dispatch_private_state_anchor_recovery,
    ),
    PrivateRole::new(PRIVATE_PROCESS_ROLE, dispatch_private_process_role),
    PrivateRole::new(PRIVATE_ROUTER_ROLE, dispatch_private_router),
    PrivateRole::new(PRIVATE_RUNTIME_ROLE, dispatch_private_runtime_role),
];

pub static REGISTRY: PrivateRoleRegistry = PrivateRoleRegistry::new(&ROLES);

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

    #[test]
    fn host_coordinator_declares_exact_ordered_roles() {
        assert_eq!(
            REGISTRY.names(),
            [
                PRIVATE_CLIENT_BOOTSTRAP_ROLE,
                PRIVATE_SANDBOX_INIT_ROLE,
                PRIVATE_SESSION_EXEC_ROLE,
                PRIVATE_SESSION_IDENTITY_ROLE,
                PRIVATE_STATE_ANCHOR_RECOVERY_ROLE,
                PRIVATE_PROCESS_ROLE,
                PRIVATE_ROUTER_ROLE,
                PRIVATE_RUNTIME_ROLE,
            ]
        );
    }
}