from flask import Blueprint, jsonify, request, send_file

from server.auth import login_required
from server.tts_service import generate_speech, piper_available

tts_bp = Blueprint("tts", __name__)


@tts_bp.route("/api/tts", methods=["GET", "POST"])
@login_required
def tts_audio(user):
    if request.method == "POST":
        data = request.get_json(silent=True) or {}
        text = (data.get("text") or "").strip()
        lang = (data.get("lang") or "es").strip().lower()
    else:
        text = (request.args.get("text") or "").strip()
        lang = (request.args.get("lang") or "es").strip().lower()

    if not text:
        return jsonify({"error": "朗读内容不能为空"}), 400
    if len(text) > 1000:
        return jsonify({"error": "朗读内容不能超过 1000 个字符"}), 400
    if lang not in ("es", "en", "zh"):
        return jsonify({"error": "不支持的朗读语言"}), 400
    if not piper_available():
        return jsonify({"error": "Piper 未配置或未安装"}), 503

    try:
        audio_path = generate_speech(text, lang)
    except Exception as exc:
        return jsonify({"error": "Piper 生成失败: " + str(exc)}), 500

    return send_file(
        audio_path,
        mimetype="audio/wav",
        as_attachment=False,
        download_name="piper.wav",
        conditional=True,
    )