use std::process::Command;
use serde_json;

#[derive(serde::Serialize, serde::Deserialize, Clone, Debug)]
pub struct TranscriptionResult {
    pub words: Vec<Word>,
    pub segments: Vec<Segment>,
    pub language: String,
}

#[derive(serde::Serialize, serde::Deserialize, Clone, Debug)]
pub struct Word {
    pub word: String,
    pub start: f64,
    pub end: f64,
    pub confidence: f64,
}

#[derive(serde::Serialize, serde::Deserialize, Clone, Debug)]
pub struct Segment {
    pub id: usize,
    pub start: f64,
    pub end: f64,
    pub text: String,
    pub words: Vec<Word>,
}

/// Transcribe audio file using Python faster-whisper
pub fn transcribe_audio(
    file_path: &str,
    model_name: &str,
    language: Option<&str>,
) -> Result<TranscriptionResult, String> {
    // Path to Python venv and script
    let python_exe = crate::paths::python_exe();
    let python_exe = python_exe.to_str().unwrap_or_default();
    let script_path = crate::paths::root_script("transcribe.py");
    let script_path = script_path.to_str().unwrap_or_default();

    // Build command args
    let mut args = vec![script_path, file_path, model_name];
    if let Some(lang) = language {
        args.push(lang);
    }

    // Run Python script with timeout
    let output = Command::new(python_exe)
        .args(&args)
        .output()
        .map_err(|e| format!("Failed to run Python script: {}", e))?;

    // Check for timeout or other errors
    if !output.status.success() {
        let stderr = String::from_utf8_lossy(&output.stderr);
        let stdout = String::from_utf8_lossy(&output.stdout);
        return Err(format!("Python script failed: {}\nStdout: {}\nStderr: {}", 
            output.status, stdout, stderr));
    }

    // Parse JSON output
    let stdout = String::from_utf8_lossy(&output.stdout);
    let result: TranscriptionResult = serde_json::from_str(&stdout.trim())
        .map_err(|e| format!("Failed to parse JSON: {}", e))?;

    Ok(result)
}

/// Ensure model is available (faster-whisper handles this automatically)
pub fn ensure_model_downloaded(_model_name: &str) -> Result<String, String> {
    // faster-whisper downloads models on first use, so just return success
    Ok("Model ready".to_string())
}