app.py

from flask import Flask, request, jsonify, send_file, after_this_request
from flask_cors import CORS
import json
import os
import uuid

# 🔊 Text To Speech
from gtts import gTTS

# 🌍 Optional translator
try:
    from deep_translator import GoogleTranslator
    TRANSLATOR_AVAILABLE = True
except:
    TRANSLATOR_AVAILABLE = False

app = Flask(__name__)
CORS(app)

# -----------------------------
# Load disease data
# -----------------------------
BASE_DIR = os.path.dirname(os.path.abspath(__file__))
DATA_PATH = os.path.join(BASE_DIR, "diseases.json")

with open(DATA_PATH, "r", encoding="utf-8") as f:
    disease_data = json.load(f)   # dict

# -----------------------------
# Disease aliases
# -----------------------------
DISEASE_ALIASES = {
    "vascular": "vascular lesion",
    "vascular lesion": "vascular lesion",

    "bcc": "Basal Cell Carcinoma (BCC)",
    "basal cell": "Basal Cell Carcinoma (BCC)",

    "scc": "squamous cell carcinoma",
    "squamous": "squamous cell carcinoma",

    "nv": "Melanocytic Nevi (NV)",
    "melanocytic": "Melanocytic Nevi (NV)",
    "mole": "nevus",

    "bkl": "Benign Keratosis-like Lesions (BKL)",
    "keratosis": "Benign Keratosis-like Lesions (BKL)",

    "ringworm": "Tinea Ringworm Candidiasis",
    "fungal infection": "Tinea Ringworm Candidiasis",

    "warts": "Warts Molluscum Viral Infections",

    "ak": "actinic keratosis",
    "actinic": "actinic keratosis",

    "df": "dermatofibroma",
    "dermatofibroma": "dermatofibroma",

    "pigmented keratosis": "pigmented benign keratosis"
}

# -----------------------------
# Supported languages
# -----------------------------
SUPPORTED_LANGUAGES = {
    "en": "English",
    "ta": "Tamil",
    "hi": "Hindi",
    "te": "Telugu",
    "ml": "Malayalam",
    "kn": "Kannada",
    "bn": "Bengali",
    "mr": "Marathi",
    "ur": "Urdu",
    "es": "Spanish"
}

# -----------------------------
# Home
# -----------------------------
@app.route("/")
def home():
    return "Chatbot backend running"

# -----------------------------
# CHAT API
# -----------------------------
@app.route("/chat", methods=["GET", "POST"])
def chat():

    # GET → simple test
    if request.method == "GET":
        return jsonify({
            "info": "Use POST method",
            "example": {
                "message": "acne",
                "language": "en"
            }
        })

    try:
        data = request.get_json(force=True)

        if "message" not in data:
            return jsonify({"reply": "Invalid request"}), 400

        user_input = data["message"]
        user_lang = data.get("language", "en")

        if user_lang not in SUPPORTED_LANGUAGES:
            user_lang = "en"

        # 🔄 Translate input → English
        translated_input = user_input
        if user_lang != "en" and TRANSLATOR_AVAILABLE:
            try:
                translated_input = GoogleTranslator(
                    source=user_lang, target="en"
                ).translate(user_input)
            except:
                translated_input = user_input

        normalized_input = translated_input.lower()

        # 🔍 Alias match
        matched_disease = None
        for key, value in DISEASE_ALIASES.items():
            if key in normalized_input:
                matched_disease = value
                break

        # 🔍 Direct match
        if not matched_disease:
            for disease_name in disease_data.keys():
                if disease_name.lower() in normalized_input:
                    matched_disease = disease_name
                    break

        if not matched_disease or matched_disease not in disease_data:
            return jsonify({"reply": "Disease information not found."})

        info = disease_data[matched_disease]

        # 🧾 English response
        english_response = (
            f"Disease: {matched_disease}\n\n"
            f"Type: {info.get('type','-')}\n"
            f"Nature: {info.get('nature','-')}\n"
            f"Contagious: {info.get('contagious','-')}\n\n"
            f"Description:\n{info.get('description','-')}\n\n"
            f"Symptoms:\n➤ " + "\n➤ ".join(info.get("symptoms", [])) + "\n\n"
            f"Causes:\n➤ " + "\n➤ ".join(info.get("causes", [])) + "\n\n"
            f"Precautions:\n➤ " + "\n➤ ".join(info.get("precautions", [])) + "\n\n"
            f"Treatment:\n➤ " + "\n➤ ".join(info.get("treatment", [])) + "\n\n"
            "⚠ Educational purpose only. Consult a dermatologist."
        )

        # 🌍 Translate output
        final_response = english_response
        if user_lang != "en" and TRANSLATOR_AVAILABLE:
            try:
                final_response = GoogleTranslator(
                    source="en", target=user_lang
                ).translate(english_response)
            except:
                final_response = english_response

        return jsonify({
            "reply": final_response,
            "language": SUPPORTED_LANGUAGES[user_lang]
        })

    except Exception as e:
        print("CHAT ERROR:", e)
        return jsonify({"reply": "Server error"}), 500

# -----------------------------
# 🔊 TEXT TO SPEECH API (FINAL)
# -----------------------------
@app.route("/tts", methods=["POST"])
def tts():
    try:
        data = request.get_json(force=True)
        text = data.get("text")
        lang = data.get("language", "en")

        if not text:
            return jsonify({"error": "No text provided"}), 400

        if lang not in SUPPORTED_LANGUAGES:
            lang = "en"

        filename = f"tts_{uuid.uuid4()}.mp3"
        gTTS(text=text, lang=lang).save(filename)

        # 🔥 delete file after sending
        @after_this_request
        def cleanup(response):
            try:
                os.remove(filename)
            except:
                pass
            return response

        return send_file(
            filename,
            mimetype="audio/mpeg",
            as_attachment=False   # IMPORTANT for browser play
        )

    except Exception as e:
        print("TTS ERROR:", e)
        return jsonify({"error": "TTS failed"}), 500

# -----------------------------
# RUN
# -----------------------------
if __name__ == "__main__":
    app.run(host="0.0.0.0", port=7860, debug=True)