//! # Cursor
//!
//! represents the position of an user's cursor, with
//! information about their identity

use uuid::Uuid;
use codemp_proto as proto;

/// user cursor position in a buffer
#[derive(Clone, Debug, Default)]
pub struct Cursor {
	/// range of text change, as char indexes in buffer previous state
	pub start: (i32, i32),
	pub end: (i32, i32),
	pub buffer: String,
	pub user: Option<Uuid>,
}


impl From<proto::cursor::CursorPosition> for Cursor {
	fn from(value: proto::cursor::CursorPosition) -> Self {
		Self {
			start: (value.start.row, value.start.col),
			end: (value.end.row, value.end.col),
			buffer: value.buffer.path,
			user: None,
		}
	}
}

impl From<Cursor> for proto::cursor::CursorPosition {
	fn from(value: Cursor) -> Self {
		Self {
			buffer: proto::files::BufferNode { path: value.buffer },
			start: proto::cursor::RowCol { row: value.start.0, col: value.start.1 },
			end: proto::cursor::RowCol { row: value.end.0, col: value.end.1 },
		}
	}
}

impl From<proto::cursor::CursorEvent> for Cursor {
	fn from(value: proto::cursor::CursorEvent) -> Self {
		Self {
			start: (value.position.start.row, value.position.start.col),
			end: (value.position.end.row, value.position.end.col),
			buffer: value.position.buffer.path,
			user: Uuid::parse_str(&value.user.id).ok(),
		}
	}
}

impl From<Cursor> for proto::cursor::CursorEvent {
	fn from(value: Cursor) -> Self {
		Self {
			user: proto::common::Identity { id: value.user.unwrap_or_default().to_string() },
			position: proto::cursor::CursorPosition {
				buffer: proto::files::BufferNode { path: value.buffer },
				start: proto::cursor::RowCol { row: value.start.0, col: value.start.1 },
				end: proto::cursor::RowCol { row: value.end.0, col: value.end.1 },
			}
		}
	}
}