mod commands;

use clap::Subcommand;
use conduit::Result;
use ruma::{events::room::message::RoomMessageEventContent, EventId, RoomId, ServerName};

use self::commands::*;

#[cfg_attr(test, derive(Debug))]
#[derive(Subcommand)]
pub(super) enum DebugCommand {
	/// - Echo input of admin command
	Echo {
		message: Vec<String>,
	},

	/// - Get the auth_chain of a PDU
	GetAuthChain {
		/// An event ID (the $ character followed by the base64 reference hash)
		event_id: Box<EventId>,
	},

	/// - Parse and print a PDU from a JSON
	///
	/// The PDU event is only checked for validity and is not added to the
	/// database.
	///
	/// This command needs a JSON blob provided in a Markdown code block below
	/// the command.
	ParsePdu,

	/// - Retrieve and print a PDU by ID from the conduwuit database
	GetPdu {
		/// An event ID (a $ followed by the base64 reference hash)
		event_id: Box<EventId>,
	},

	/// - Attempts to retrieve a PDU from a remote server. Inserts it into our
	///   database/timeline if found and we do not have this PDU already
	///   (following normal event auth rules, handles it as an incoming PDU).
	GetRemotePdu {
		/// An event ID (a $ followed by the base64 reference hash)
		event_id: Box<EventId>,

		/// Argument for us to attempt to fetch the event from the
		/// specified remote server.
		server: Box<ServerName>,
	},

	/// - Same as `get-remote-pdu` but accepts a codeblock newline delimited
	///   list of PDUs and a single server to fetch from
	GetRemotePduList {
		/// Argument for us to attempt to fetch all the events from the
		/// specified remote server.
		server: Box<ServerName>,

		/// If set, ignores errors, else stops at the first error/failure.
		#[arg(short, long)]
		force: bool,
	},

	/// - Gets all the room state events for the specified room.
	///
	/// This is functionally equivalent to `GET
	/// /_matrix/client/v3/rooms/{roomid}/state`, except the admin command does
	/// *not* check if the sender user is allowed to see state events. This is
	/// done because it's implied that server admins here have database access
	/// and can see/get room info themselves anyways if they were malicious
	/// admins.
	///
	/// Of course the check is still done on the actual client API.
	GetRoomState {
		/// Room ID
		room_id: Box<RoomId>,
	},

	/// - Sends a federation request to the remote server's
	///   `/_matrix/federation/v1/version` endpoint and measures the latency it
	///   took for the server to respond
	Ping {
		server: Box<ServerName>,
	},

	/// - Forces device lists for all local and remote users to be updated (as
	///   having new keys available)
	ForceDeviceListUpdates,

	/// - Change tracing log level/filter on the fly
	///
	/// This accepts the same format as the `log` config option.
	ChangeLogLevel {
		/// Log level/filter
		filter: Option<String>,

		/// Resets the log level/filter to the one in your config
		#[arg(short, long)]
		reset: bool,
	},

	/// - Verify json signatures
	///
	/// This command needs a JSON blob provided in a Markdown code block below
	/// the command.
	SignJson,

	/// - Verify json signatures
	///
	/// This command needs a JSON blob provided in a Markdown code block below
	/// the command.
	VerifyJson,

	/// - Prints the very first PDU in the specified room (typically
	///   m.room.create)
	FirstPduInRoom {
		/// The room ID
		room_id: Box<RoomId>,
	},

	/// - Prints the latest ("last") PDU in the specified room (typically a
	///   message)
	LatestPduInRoom {
		/// The room ID
		room_id: Box<RoomId>,
	},

	/// - Forcefully replaces the room state of our local copy of the specified
	///   room, with the copy (auth chain and room state events) the specified
	///   remote server says.
	///
	/// A common desire for room deletion is to simply "reset" our copy of the
	/// room. While this admin command is not a replacement for that, if you
	/// know you have split/broken room state and you know another server in the
	/// room that has the best/working room state, this command can let you use
	/// their room state. Such example is your server saying users are in a
	/// room, but other servers are saying they're not in the room in question.
	///
	/// This command will get the latest PDU in the room we know about, and
	/// request the room state at that point in time via
	/// `/_matrix/federation/v1/state/{roomId}`.
	ForceSetRoomStateFromServer {
		/// The impacted room ID
		room_id: Box<RoomId>,
		/// The server we will use to query the room state for
		server_name: Box<ServerName>,
	},

	/// - Runs a server name through conduwuit's true destination resolution
	///   process
	///
	/// Useful for debugging well-known issues
	ResolveTrueDestination {
		server_name: Box<ServerName>,

		#[arg(short, long)]
		no_cache: bool,
	},

	/// - Print extended memory usage
	MemoryStats,
}

pub(super) async fn process(command: DebugCommand, body: Vec<&str>) -> Result<RoomMessageEventContent> {
	Ok(match command {
		DebugCommand::Echo {
			message,
		} => echo(body, message).await?,
		DebugCommand::GetAuthChain {
			event_id,
		} => get_auth_chain(body, event_id).await?,
		DebugCommand::ParsePdu => parse_pdu(body).await?,
		DebugCommand::GetPdu {
			event_id,
		} => get_pdu(body, event_id).await?,
		DebugCommand::GetRemotePdu {
			event_id,
			server,
		} => get_remote_pdu(body, event_id, server).await?,
		DebugCommand::GetRoomState {
			room_id,
		} => get_room_state(body, room_id).await?,
		DebugCommand::Ping {
			server,
		} => ping(body, server).await?,
		DebugCommand::ForceDeviceListUpdates => force_device_list_updates(body).await?,
		DebugCommand::ChangeLogLevel {
			filter,
			reset,
		} => change_log_level(body, filter, reset).await?,
		DebugCommand::SignJson => sign_json(body).await?,
		DebugCommand::VerifyJson => verify_json(body).await?,
		DebugCommand::FirstPduInRoom {
			room_id,
		} => first_pdu_in_room(body, room_id).await?,
		DebugCommand::LatestPduInRoom {
			room_id,
		} => latest_pdu_in_room(body, room_id).await?,
		DebugCommand::GetRemotePduList {
			server,
			force,
		} => get_remote_pdu_list(body, server, force).await?,
		DebugCommand::ForceSetRoomStateFromServer {
			room_id,
			server_name,
		} => force_set_room_state_from_server(body, server_name, room_id).await?,
		DebugCommand::ResolveTrueDestination {
			server_name,
			no_cache,
		} => resolve_true_destination(body, server_name, no_cache).await?,
		DebugCommand::MemoryStats => memory_stats(),
	})
}