from pygls.server import LanguageServer
from lsprotocol.types import (
    TEXT_DOCUMENT_COMPLETION,
    CompletionItem,
    CompletionList,
    CompletionParams,
)

server = LanguageServer("example-server", "v0.1")


@server.feature(TEXT_DOCUMENT_COMPLETION)
def completions(params: CompletionParams):
    items = []
    document = server.workspace.get_document(params.text_document.uri)
    current_line = document.lines[params.position.line].strip()
    if current_line.endswith("hello."):
        items = [
            CompletionItem(label="world"),
            CompletionItem(label="friend"),
        ]
    return CompletionList(
        is_incomplete=False,
        items=items,
    )


server.start_io()