//! This is a small CLI intended to be run on a host that accepts dooris commands via SSH
//!
//! The SSH server should be configured to force execution of this command via the following server config snippet
//!
//! ```sshd_config
//! Match User dooris
//!   AuthorizedKeysFile /path/to/api/state/authorized_keys
//!   ForceCommand /path/to/ssh-cli
//!   SetEnv DOORIS_SERVER_URL=https://dooris.ccchh.net/ DOORIS_API_TOKEN=foobar123
//! ```

mod api_client;
mod api_models;
mod cli;

use std::{process::exit, time::Duration};

use eyre::eyre;

use crate::{
    api_client::ApiClient,
    api_models::{ApiLock, DesiredLockState, LockState},
};

#[tokio::main(flavor = "current_thread")]
async fn main() -> eyre::Result<()> {
    tracing_subscriber::fmt::init();
    simple_eyre::install()?;

    let args = cli::CliArgs::parse()?;
    tracing::debug!(cli = ?args, "Parsed CLI parameters");

    match args {
        cli::CliArgs::Help => {
            println!(
                "dooris-over-ssh: Your personal door assistant with an extra serving of chaos"
            );
            println!(
                "Usage: ssh dooris@dooris.ccchh.net <help | show-locks | lock <door> [wait|nowait] | unlock <door> [wait|nowait]>"
            );
            println!();
            println!("Commands:");
            println!();
            println!("  help -> The help command prints this message. Hello 👋");
            println!("");
            println!(
                "  show-locks -> Display a list of currently connected locks along with their status."
            );
            println!("");
            println!("  lock <lock> [wait|nowait] -> Locks the door identified with <lock>.");
            println!(
                "    Also takes an additional parameter of \"wait\" or \"nowait\"which dictates"
            );
            println!("    whether the CLI exit as soon as the lock operation is queued or whether");
            println!("    it waits until the lock status changes to closed.");
            println!("    Defaults to \"wait\" if not specified.");
            println!();
            println!("  unlock <lock> [wait|nowait] -> Unlocks the lock identified with <lock>.");
            println!(
                "    Also takes an additional parameter of \"wait\" or \"nowait\"which dictates"
            );
            println!("    whether the CLI exit as soon as the lock operation is queued or whether");
            println!("    it waits until the lock status changes to open.");
            println!("    Defaults to \"wait\" if not specified.");
            exit(0);
        }
        cli::CliArgs::Lock {
            lock_name,
            wait_until_done,
        } => {
            let api = ApiClient::new_from_env()?;
            let lock = find_lock(&api, &lock_name).await?;

            println!("dooris at your service, locking {} now…", lock.name);
            print_lock_warnings(&lock);
            api.operate_lock(&lock.id, DesiredLockState::CLOSED).await?;

            if wait_until_done {
                wait_for_lock_state(&api, &lock_name, LockState::LOCKED).await?;
                println!("Lock is now closed. Enjoy <3");
            } else {
                println!("Lock is now closing. Enjoy <3");
            }

            exit(0);
        }
        cli::CliArgs::Unlock {
            lock_name,
            wait_until_done,
        } => {
            let api = ApiClient::new_from_env()?;
            let lock = find_lock(&api, &lock_name).await?;

            println!("dooris at your service, unlocking {} now…", lock.name);
            print_lock_warnings(&lock);
            api.operate_lock(&lock.id, DesiredLockState::OPEN).await?;

            if wait_until_done {
                wait_for_lock_state(&api, &lock_name, LockState::UNLOCKED).await?;
                println!("Lock is now opened. Enjoy <3");
            } else {
                println!("Lock is now opening. Enjoy <3");
            }

            exit(0);
        }
        cli::CliArgs::ShowLocks => {
            let api = ApiClient::new_from_env()?;
            let locks = api.fetch_locks().await?;

            for i_lock in locks.iter() {
                println!(">> {}", i_lock.name);
                print_lock_warnings(&lock);
                println!("    State:          {:?}", i_lock.status.lock_state);
                println!("    Desired State:  {:?}", i_lock.status.lock_target_level);
                println!("    Acitivty:       {:?}", i_lock.status.activity_state);
                println!();
            }

            exit(0);
        }
    };
}

async fn find_lock(api: &ApiClient, name: &str) -> eyre::Result<ApiLock> {
    let locks = api.fetch_locks().await?;
    tracing::trace!("Comparing locks from API for one with name {name:?}");
    let lock = locks
        .into_iter()
        .find(|i_lock| i_lock.name.eq_ignore_ascii_case(&name))
        .ok_or_else(|| {
            eyre!("No lock named {name:?} exists. See \"list-locks\" for a list of valid locks.")
        })?;
    tracing::trace!(lock = ?lock, "Identified lock with name matching {name:?}");
    Ok(lock)
}

async fn wait_for_lock_state(
    api: &ApiClient,
    lock_name: &str,
    desired_state: LockState,
) -> eyre::Result<()> {
    tokio::time::sleep(Duration::from_millis(200)).await;
    let lock = find_lock(&api, &lock_name).await?;
    let mut interval = tokio::time::interval(Duration::from_millis(500));
    let mut last_status = lock.status;
    while last_status.lock_state != desired_state {
        interval.tick().await;
        let lock = find_lock(&api, &lock_name).await?;
        if lock.status != last_status {
            println!(
                "Lock state changed to {:?} (activity={:?})",
                lock.status.lock_state, lock.status.activity_state
            );
            last_status = lock.status;
        }
    }

    Ok(())
}

/// Display big warnings if the lock is in an error state like jammed/disconnected/low battery
fn print_lock_warnings(lock: &ApiLock) {
    let has_any_error =
        lock.status.is_unreachable || lock.status.is_low_battery || lock.status.is_error_jammed;

    if has_any_error {
        println!("    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
    }

    if lock.status.is_unreachable {
        println!("    !!!                               !!!");
        println!("    !!! Lock is currently unreachable !!!");
        println!("    !!!                               !!!");
    }
    if lock.status.is_low_battery {
        println!("    !!!                               !!!");
        println!("    !!!     Lock has low battery      !!!");
        println!("    !!!                               !!!");
    }
    if lock.status.is_error_jammed {
        println!("    !!!                               !!!");
        println!("    !!!       Lock is jammed          !!!");
        println!("    !!!                               !!!");
    }

    if has_any_error {
        println!("    !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!")
    }
}