use std::collections::HashSet;

use pretty_assertions::assert_eq;

use super::*;

fn set<'a>(items: &'a [&'a str]) -> HashSet<&'a str> {
    items.iter().copied().collect()
}

fn assert_mentions(text: &str, expected_names: &[&str], expected_paths: &[&str]) {
    let mentions = extract_tool_mentions(text);
    assert_eq!(mentions.names, set(expected_names));
    assert_eq!(mentions.paths, set(expected_paths));
}

#[test]
fn handles_plain_and_linked_mentions() {
    assert_mentions(
        "use $alpha and [$beta](/tmp/beta)",
        &["alpha", "beta"],
        &["/tmp/beta"],
    );
}

#[test]
fn skips_common_env_vars() {
    assert_mentions("use $PATH and $alpha", &["alpha"], &[]);
    assert_mentions("use [$HOME](/tmp/skill)", &[], &[]);
    assert_mentions("use $XDG_CONFIG_HOME and $beta", &["beta"], &[]);
}

#[test]
fn requires_link_syntax() {
    assert_mentions("[beta](/tmp/beta)", &[], &[]);
    assert_mentions("[$beta] /tmp/beta", &["beta"], &[]);
    assert_mentions("[$beta]()", &["beta"], &[]);
}

#[test]
fn trims_linked_paths_and_allows_spacing() {
    assert_mentions("use [$beta]   ( /tmp/beta )", &["beta"], &["/tmp/beta"]);
}

#[test]
fn stops_at_non_name_chars() {
    assert_mentions(
        "use $alpha.skill and $beta_extra",
        &["alpha", "beta_extra"],
        &[],
    );
}

#[test]
fn keeps_plugin_skill_namespaces() {
    assert_mentions(
        "use $slack:search and $alpha",
        &["alpha", "slack:search"],
        &[],
    );
}

#[test]
fn requires_exact_name_boundaries() {
    assert_mentions(
        "use $notion-research-doc but not $notion-research-docs or $notion-research-doc_extra",
        &[
            "notion-research-doc",
            "notion-research-docs",
            "notion-research-doc_extra",
        ],
        &[],
    );
}

#[test]
fn handles_many_sigils_without_looping() {
    let prefix = "$".repeat(256);
    assert_mentions(&format!("{prefix} not-a-mention"), &[], &[]);
}