//! Runs completion for testing purposes.

use crate::{
    completion::{completion_item::CompletionKind, CompletionConfig},
    mock_analysis::{analysis_and_position, single_file_with_position},
    CompletionItem,
};
use hir::Semantics;
use ra_syntax::{AstNode, NodeOrToken, SyntaxElement, SyntaxToken};

pub(crate) fn do_completion(code: &str, kind: CompletionKind) -> Vec<CompletionItem> {
    do_completion_with_options(code, kind, &CompletionConfig::default())
}

pub(crate) fn do_completion_with_options(
    code: &str,
    kind: CompletionKind,
    options: &CompletionConfig,
) -> Vec<CompletionItem> {
    let (analysis, position) = if code.contains("//-") {
        analysis_and_position(code)
    } else {
        single_file_with_position(code)
    };
    let completions = analysis.completions(options, position).unwrap().unwrap();
    let completion_items: Vec<CompletionItem> = completions.into();
    let mut kind_completions: Vec<CompletionItem> =
        completion_items.into_iter().filter(|c| c.completion_kind == kind).collect();
    kind_completions.sort_by_key(|c| c.label().to_owned());
    kind_completions
}

pub(crate) fn check_pattern_is_applicable(code: &str, check: fn(SyntaxElement) -> bool) {
    let (analysis, pos) = single_file_with_position(code);
    analysis
        .with_db(|db| {
            let sema = Semantics::new(db);
            let original_file = sema.parse(pos.file_id);
            let token = original_file.syntax().token_at_offset(pos.offset).left_biased().unwrap();
            assert!(check(NodeOrToken::Token(token)));
        })
        .unwrap();
}