voice-to-notes/src-tauri/src/commands/transcribe.rs

use serde_json::{json, Value};

use crate::sidecar::messages::IPCMessage;
use crate::sidecar::SidecarManager;

/// Start transcription of an audio file via the Python sidecar.
///
/// This is a blocking command — it starts the sidecar if needed,
/// sends the transcribe request, and waits for the result.
#[tauri::command]
pub fn transcribe_file(
    file_path: String,
    model: Option<String>,
    device: Option<String>,
    language: Option<String>,
) -> Result<Value, String> {
    // Determine Python sidecar path (relative to app)
    let python_path = std::env::current_dir()
        .map_err(|e| e.to_string())?
        .join("../python")
        .canonicalize()
        .map_err(|e| format!("Cannot find python directory: {e}"))?;

    let python_path_str = python_path.to_string_lossy().to_string();

    let manager = SidecarManager::new();
    manager.start(&python_path_str)?;

    let request_id = uuid::Uuid::new_v4().to_string();
    let msg = IPCMessage::new(
        &request_id,
        "transcribe.start",
        json!({
            "file": file_path,
            "model": model.unwrap_or_else(|| "base".to_string()),
            "device": device.unwrap_or_else(|| "cpu".to_string()),
            "compute_type": "int8",
            "language": language,
        }),
    );

    let response = manager.send_and_receive(&msg)?;

    if response.msg_type == "error" {
        return Err(format!(
            "Transcription error: {}",
            response.payload.get("message").and_then(|v| v.as_str()).unwrap_or("unknown")
        ));
    }

    Ok(response.payload)
}