pub fn voice_for_lang(lang: &str) -> String {
    match lang {
        "zh_TW" => "Meijia",
        "zh_CN" => "Ting-Ting",
        "en_US" => "Samantha",
        "en_GB" => "Daniel",
        "ja_JP" => "Kyoko",
        "ko_KR" => "Yuna",
        "fr_FR" => "Amelie",
        "de_DE" => "Anna",
        _ => "Meijia",
    }
    .to_string()
}

pub fn phrase_for_lang(lang: &str) -> String {
    match lang {
        "zh_TW" | "zh_CN" => "語音測試一二三",
        "en_US" | "en_GB" => "Test one two three",
        "ja_JP" => "これはテストです",
        "ko_KR" => "테스트입니다",
        "fr_FR" => "Ceci est un test",
        "de_DE" => "Das ist ein Test",
        _ => "Test",
    }
    .to_string()
}

pub fn audio_devices() -> (Vec<String>, Vec<String>, String, String) {
    let run = |t: &str| -> Vec<String> {
        if let Ok(r) = std::process::Command::new("SwitchAudioSource")
            .args(["-a", "-t", t, "-f", "json"])
            .output()
        {
            String::from_utf8_lossy(&r.stdout)
                .lines()
                .filter_map(|l| {
                    serde_json::from_str::<serde_json::Value>(l)
                        .ok()
                        .and_then(|v| v["name"].as_str().map(|s| s.to_string()))
                })
                .collect()
        } else {
            vec![]
        }
    };

    let current = |t: &str| -> String {
        std::process::Command::new("SwitchAudioSource")
            .args(["-c", "-t", t])
            .output()
            .map(|r| String::from_utf8_lossy(&r.stdout).trim().to_string())
            .unwrap_or_default()
    };

    let out = run("output");
    let inp = run("input");
    let co = current("output");
    let ci = current("input");
    (out, inp, co, ci)
}

pub fn inject_audio_devices(
    html: &str,
    out: &[String],
    inp: &[String],
    cur_out: &str,
    cur_in: &str,
) -> String {
    let mut out_opts = String::from("<option value=\"\">🔊 System</option>");
    for d in out {
        let sel = if d == cur_out { " selected" } else { "" };
        out_opts.push_str(&format!("<option value=\"{d}\"{sel}>{d}</option>"));
    }
    let mut inp_opts = String::from("<option value=\"\">🎤 System</option>");
    for d in inp {
        let sel = if d == cur_in { " selected" } else { "" };
        inp_opts.push_str(&format!("<option value=\"{d}\"{sel}>{d}</option>"));
    }
    html.replace("{out_devs}", &out_opts)
        .replace("{in_devs}", &inp_opts)
}