use anyhow::Result;
use analysis::ProcIndex;
use lsp_types as lsp;
use text::DocumentStore;

pub fn document_symbol(
    docs: &DocumentStore,
    index: &ProcIndex,
    uri: &lsp::Uri
) -> Result<Option<lsp::DocumentSymbolResponse>> {
    let Some(doc) = docs.get(uri) else {
        return Ok(None);
    };
    let Some(procs) = index.get(uri) else {
        return Ok(None);
    };

    let mut symbols = Vec::new();
    for p in procs {
        let range = doc.byte_range_to_lsp_range(p.byte_start, p.byte_end);
        symbols.push(lsp::DocumentSymbol {
            name: p.name.clone(),
            detail: Some(format!("proc {}", p.params.join(" "))),
            kind: lsp::SymbolKind::FUNCTION,
            range,
            selection_range: range,
            children: None,
            tags: None,
            deprecated: None,
        });
    }

    Ok(Some(lsp::DocumentSymbolResponse::Nested(symbols)))
}