asurada 0.1.0

// ElevenLabs Cloud TTS HTTP client.
//
// 사용자는 본인 API 키를 환경 변수로 주입:
//   ASURADA_ELEVENLABS_API_KEY  - https://elevenlabs.io 에서 발급
//   ASURADA_ELEVENLABS_VOICE_ID - 사용할 voice id (asurada tts voices 로 조회)
//
// 향후: keychain 으로 secret 분리.

use anyhow::{anyhow, Context, Result};
use reqwest::Client;
use serde::Deserialize;
use serde_json::json;
use std::time::Duration;

pub struct ElevenLabsClient {
    http: Client,
    api_key: String,
}

#[derive(Debug, Deserialize)]
pub struct Voice {
    pub voice_id: String,
    pub name: String,
}

impl ElevenLabsClient {
    pub fn new(api_key: impl Into<String>) -> Result<Self> {
        let api_key = api_key.into();
        if api_key.is_empty() {
            return Err(anyhow!("ElevenLabs API key is empty"));
        }
        let http = Client::builder()
            .timeout(Duration::from_secs(30))
            .build()
            .context("build reqwest client")?;
        Ok(Self { http, api_key })
    }

    pub async fn list_voices(&self) -> Result<Vec<Voice>> {
        let resp = self
            .http
            .get("https://api.elevenlabs.io/v1/voices")
            .header("xi-api-key", &self.api_key)
            .send()
            .await
            .context("ElevenLabs list_voices")?;
        if !resp.status().is_success() {
            let body = resp.text().await.unwrap_or_default();
            return Err(anyhow!("list_voices HTTP error: {}", body));
        }
        let data: serde_json::Value = resp.json().await.context("parse voices")?;
        let voices = data["voices"]
            .as_array()
            .ok_or_else(|| anyhow!("unexpected response shape"))?
            .iter()
            .filter_map(|v| serde_json::from_value(v.clone()).ok())
            .collect();
        Ok(voices)
    }

    /// 텍스트를 voice_id 로 합성 → MP3 bytes 반환.
    pub async fn synthesize(&self, text: &str, voice_id: &str) -> Result<Vec<u8>> {
        let endpoint = format!(
            "https://api.elevenlabs.io/v1/text-to-speech/{}",
            voice_id
        );
        let body = json!({
            "text": text,
            "model_id": "eleven_multilingual_v2",
            "voice_settings": {
                "stability": 0.5,
                "similarity_boost": 0.75
            }
        });
        let resp = self
            .http
            .post(&endpoint)
            .header("xi-api-key", &self.api_key)
            .header("Content-Type", "application/json")
            .json(&body)
            .send()
            .await
            .context("ElevenLabs TTS request")?;

        if !resp.status().is_success() {
            let status = resp.status();
            let body = resp.text().await.unwrap_or_default();
            return Err(anyhow!(
                "TTS HTTP {}: {}",
                status,
                body.chars().take(300).collect::<String>()
            ));
        }
        let audio = resp.bytes().await.context("read audio bytes")?;
        Ok(audio.to_vec())
    }

    /// 합성 + 즉시 재생.
    pub async fn speak(&self, text: &str, voice_id: &str) -> Result<()> {
        let audio = self.synthesize(text, voice_id).await?;
        play_audio_bytes(&audio).await
    }
}

/// MP3 bytes 를 임시 파일에 쓴 후 OS 의 기본 플레이어로 재생.
async fn play_audio_bytes(audio: &[u8]) -> Result<()> {
    let tmp = std::env::temp_dir().join(format!("asurada_tts_{}.mp3", std::process::id()));
    tokio::fs::write(&tmp, audio).await.context("write tmp mp3")?;
    let result = tokio::task::spawn_blocking({
        let path = tmp.clone();
        move || play_blocking(&path)
    })
    .await
    .context("playback task")?;
    let _ = tokio::fs::remove_file(&tmp).await;
    result
}

#[cfg(target_os = "macos")]
fn play_blocking(path: &std::path::Path) -> Result<()> {
    let status = std::process::Command::new("afplay")
        .arg(path)
        .status()
        .context("afplay")?;
    if !status.success() {
        return Err(anyhow!("afplay exited {}", status));
    }
    Ok(())
}

#[cfg(not(target_os = "macos"))]
fn play_blocking(path: &std::path::Path) -> Result<()> {
    for player in &["mpg123", "mpg321", "paplay"] {
        if std::process::Command::new(player)
            .arg(path)
            .status()
            .map(|s| s.success())
            .unwrap_or(false)
        {
            return Ok(());
        }
    }
    Err(anyhow!("No audio player found. Install mpg123."))
}