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(() => {
    const messagesEl = document.getElementById("messages");
    const composer = document.getElementById("composer");
    const input = document.getElementById("message-input");
    const convIdEl = document.getElementById("conv-id");
    const slotsBox = document.getElementById("slots-box");

    let conversationId = null;
    let busy = false;

    function addBubble(role, text) {
        const div = document.createElement("div");
        div.className = `bubble ${role}`;
        div.textContent = text;
        messagesEl.appendChild(div);
        messagesEl.scrollTop = messagesEl.scrollHeight;
    }

    function renderLead(lead) {
        document.getElementById("lead-name").textContent =
            (lead && lead.name) || "—";
        document.getElementById("lead-need").textContent =
            (lead && lead.need) || "—";
        document.getElementById("lead-budget").textContent =
            (lead && lead.budget) || "—";
        document.getElementById("lead-contact").textContent =
            (lead && (lead.contact_channel || lead.email || lead.phone)) ||
            "—";
    }

    function renderSlots(slots) {
        slotsBox.innerHTML = "";
        if (!slots || !slots.length) {
            slotsBox.innerHTML =
                '<div style="color:var(--muted);font-size:0.9rem">—</div>';
            return;
        }
        slots.forEach((slot) => {
            const btn = document.createElement("button");
            btn.type = "button";
            btn.className = "slot-btn";
            btn.textContent = slot.label || slot.start;
            btn.addEventListener("click", () => bookSlot(slot));
            slotsBox.appendChild(btn);
        });
    }

    async function bookSlot(slot) {
        if (!conversationId) return;
        const res = await fetch("/api/appointments/book", {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify({
                conversation_id: conversationId,
                slot_start: slot.start,
                slot_end: slot.end,
            }),
        });
        const data = await res.json();
        if (!res.ok) {
            addBubble("assistant", data.detail || "Booking failed");
            return;
        }
        addBubble(
            "assistant",
            data.message || "Appointment booked"
        );
        renderSlots([]);
    }

    async function loadHealth() {
        try {
            const res = await fetch("/api/health");
            const data = await res.json();
            document.getElementById("h-openai").textContent = data.openai
                ? "on"
                : "demo";
            document.getElementById("h-calcom").textContent = data.calcom
                ? "on"
                : "demo";
            document.getElementById("h-whatsapp").textContent = data.whatsapp
                ? "on"
                : "demo";
            document.getElementById("h-chunks").textContent =
                data.knowledge_chunks;
        } catch (_) {
            /* ignore */
        }
    }

    async function startChat() {
        messagesEl.innerHTML = "";
        const res = await fetch(
            "/api/chat/start?ui_language=en",
            { method: "POST" }
        );
        const data = await res.json();
        conversationId = data.conversation_id;
        convIdEl.textContent = `#${conversationId}`;
        addBubble("assistant", data.greeting);
        renderLead(null);
        renderSlots([]);
    }

    composer.addEventListener("submit", async (event) => {
        event.preventDefault();
        if (busy || !conversationId) return;
        const text = input.value.trim();
        if (!text) return;
        input.value = "";
        addBubble("user", text);
        busy = true;
        try {
            const res = await fetch("/api/chat/message", {
                method: "POST",
                headers: { "Content-Type": "application/json" },
                body: JSON.stringify({
                    conversation_id: conversationId,
                    message: text,
                    ui_language: "en",
                }),
            });
            const data = await res.json();
            addBubble("assistant", data.reply);
            renderLead(data.lead);
            renderSlots(data.suggested_slots);
        } catch (err) {
            addBubble("assistant", "Network error. Please retry.");
        } finally {
            busy = false;
        }
    });

    loadHealth();
    startChat();
})();