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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/all.min.css">
    <style>
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f4f7fb;
            margin: 0;
            padding: 0;
        }
        #chat-container {
            max-width: 500px;
            margin: auto;
            padding: 25px;
            border-radius: 15px;
            background-color: #fff;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
            position: relative;
        }
        #chat-history {
            height: 400px;
            overflow-y: auto;
            padding: 15px;
            background: linear-gradient(135deg, #f3f4f8 0%, #d3e0f0 100%);
            border-radius: 15px;
            box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.1);
            margin-bottom: 15px;
        }
        .message {
            padding: 12px 15px;
            margin: 10px 0;
            border-radius: 20px;
            font-size: 0.9em;
            line-height: 1.4em;
            position: relative;
        }
        .user-message {
            background: linear-gradient(135deg, #c9e6f5 0%, #91c9e6 100%);
            color: #006c8e;
            margin-left: auto;
            border-radius: 20px 20px 0 20px;
        }
        .bot-message {
            background: linear-gradient(135deg, #fce0e0 0%, #85cfb6 100%);
            color: #8b3e40;
            margin-right: auto;
            border-radius: 20px 20px 20px 0;
        }
        .user-icon, .bot-icon {
            margin-right: 10px;
            font-size: 1.2em;
        }
        #user-input {
            border: 1px solid #ddd;
            border-radius: 8px;
            resize: none;
            padding: 12px;
            font-size: 1em;
            width: calc(100% - 48px);
        }
        #user-input:focus {
            border-color: #007bff;
            outline: none;
        }
        .btn-send, .btn-mic {
            background-color: #007bff;
            color: white;
            border-radius: 8px;
            padding: 10px 15px;
            border: none;
            cursor: pointer;
            font-size: 1.1em;
            transition: background-color 0.3s;
        }
        .btn-send:hover, .btn-mic:hover {
            background-color: #0056b3;
        }
        #language-selector {
            margin-bottom: 10px;
        }
    </style>
    <title>Multilanguage Voice Chatbot</title>
</head>
<body>
    <div id="chat-container">
        <select id="language-selector" class="form-control">
            <option value="en-US" selected>English</option>
            <option value="hi-IN">Hindi</option>
            <option value="es-ES">Spanish</option>
            <option value="fr-FR">French</option>
        </select>
        <div id="chat-history"></div>
        <div class="input-group">
            <textarea id="user-input" class="form-control" rows="1" placeholder="Type or speak your message..." aria-label="Message input"></textarea>
            <button id="mic-button" class="btn-mic"><i class="fas fa-microphone"></i></button>
            <button id="send-button" class="btn-send"><i class="fas fa-paper-plane"></i></button>
        </div>
    </div>

    <script>
        const chatHistoryArray = [];
        const synth = window.speechSynthesis;
        let currentLanguage = "en-US"; // Default language

        // Handle language selection
        document.getElementById("language-selector").addEventListener("change", (event) => {
            currentLanguage = event.target.value;
        });

        // Add message to chat history
        function addMessage(sender, message, className) {
            const chatHistory = document.getElementById("chat-history");
            const messageElement = document.createElement("div");
            messageElement.className = `message ${className}`;
            messageElement.innerHTML = `<strong>${sender}:</strong> ${message}`;
            chatHistory.appendChild(messageElement);
            chatHistory.scrollTop = chatHistory.scrollHeight;
        }

        // Send message to server
        async function sendMessage() {
            const input = document.getElementById("user-input");
            const message = input.value.trim();
            if (!message) return;

            addMessage("User", message, "user-message");
            chatHistoryArray.push({ sender: "User", message });
            input.value = "";

            // Simulate bot typing
            const botTyping = document.createElement("div");
            botTyping.className = "typing-indicator";
            botTyping.textContent = "Bot is typing...";
            document.getElementById("chat-history").appendChild(botTyping);

            try {
                const response = await fetch("/chat/", {
                    method: "POST",
                    headers: { "Content-Type": "application/json" },
                    body: JSON.stringify({ message, language: currentLanguage })
                });
                const data = await response.json();

                botTyping.remove();
                const botMessage = data.response;
                addMessage("Bot", botMessage, "bot-message");
                chatHistoryArray.push({ sender: "Bot", message: botMessage });
                speak(botMessage, currentLanguage);
            } catch (error) {
                botTyping.remove();
                console.error("Error:", error);
                const errorMessage = "Sorry, something went wrong.";
                addMessage("Bot", errorMessage, "bot-message");
                speak(errorMessage, currentLanguage);
            }
        }

        // Text-to-Speech function
        function speak(text, lang) {
            const utterance = new SpeechSynthesisUtterance(text);
            utterance.lang = lang;
            utterance.pitch = 1;
            utterance.rate = 1;
            synth.speak(utterance);
        }

        // Speech-to-Text function
        function startListening() {
            const recognition = new (window.SpeechRecognition || window.webkitSpeechRecognition)();
            recognition.lang = currentLanguage;
            recognition.interimResults = false;

            recognition.onresult = (event) => {
                const transcript = event.results[0][0].transcript;
                document.getElementById("user-input").value = transcript;
                sendMessage();
            };

            recognition.onerror = (event) => {
                console.error("Speech recognition error:", event.error);
                addMessage("Bot", "Sorry, I couldn't understand you.", "bot-message");
                speak("Sorry, I couldn't understand you.", currentLanguage);
            };

            recognition.start();
        }

        // Event Listeners
        document.getElementById("send-button").addEventListener("click", sendMessage);
        document.getElementById("mic-button").addEventListener("click", startListening);
    </script>
</body>
</html>