//! Lyric alignment, off Windows. The aligner (lyric_align.rs) runs the CTC
//! model through Windows ML, so on Android the model is never present, never
//! downloaded, and a passage never aligns — lyric_prep's own fallback (the
//! line estimate) carries the lyrics instead. This file stands in for the
//! module (`#[path]` in lib.rs) with the same names, so lyric_prep, vocal_sep
//! and the command list need no cfg of their own.

use std::path::PathBuf;

pub(crate) fn models_dir(app: &tauri::AppHandle) -> Result<PathBuf, String> {
    let dir = crate::paths::app_data(app)
        .map_err(|e| e.to_string())?
        .join("lyric-models");
    std::fs::create_dir_all(&dir).map_err(|e| e.to_string())?;
    Ok(dir)
}

pub fn model_present(_app: &tauri::AppHandle) -> bool {
    false
}

#[tauri::command]
pub fn lyric_model_status(app: tauri::AppHandle) -> serde_json::Value {
    serde_json::json!({
        "present": false,
        "bytes": 0,
        "aligner": crate::lyric_prep::active_aligner(&app),
        "downloadBytes": 0,
        "unsupported": "word alignment runs on the desktop for now",
    })
}

#[tauri::command]
pub async fn lyric_model_download(_app: tauri::AppHandle) -> Result<(), String> {
    Err("word alignment runs on the desktop for now (Windows ML); not on this platform".into())
}

pub struct AlignedWord {
    pub start_ms: i64,
    pub end_ms: i64,
}

pub struct AlignedLine {
    pub words: Vec<AlignedWord>,
    pub confidence: f32,
}

pub fn align_passage(
    _app: &tauri::AppHandle,
    _pcm: &[f32],
    _lines: &[Vec<String>],
    _floors_ms: &[i64],
    _ceils_ms: &[i64],
) -> Result<Vec<AlignedLine>, String> {
    Err("aligner unavailable on this platform".into())
}