{% extends 'portal/base_portal.html' %}
{% load static %}
{% block title %}AI Chat - IXG Buyer Portal{% endblock %}
{% block content %}

<div class="page-header d-flex justify-content-between align-items-center">
  <h2>AI Assistant</h2>
  <div>
    <select id="agent-select" class="form-select form-select-sm d-inline-block" style="width:auto;">
      {% for a in agents %}
        <option value="{{ a.id }}"{% if a.is_default %} selected{% endif %}>{{ a.name }}{% if a.is_default %} (default){% endif %}</option>
      {% empty %}
        <option value="">No agents configured</option>
      {% endfor %}
    </select>
    <button class="btn btn-sm btn-outline-secondary" onclick="clearChat()">New Chat</button>
  </div>
</div>

<div class="row">
  <div class="col-md-8">
    <div class="stat-card d-flex flex-column" style="height: calc(100vh - 260px);">
      <div id="chat-messages" class="flex-grow-1 overflow-auto mb-3" style="min-height: 300px;">
        <div class="text-center text-muted py-5" id="welcome-msg">
          <i class="bi bi-robot fs-1"></i>
          <p class="mt-2">Select an agent and start a conversation.</p>
        </div>
      </div>
      <form id="chat-form" class="d-flex gap-2">
        <input type="text" id="chat-input" class="form-control" placeholder="Type your message..." autofocus>
        <button type="submit" class="btn btn-primary"><i class="bi bi-send"></i></button>
      </form>
    </div>
  </div>
  <div class="col-md-4">
    <div class="stat-card" style="height: calc(100vh - 260px); overflow-y: auto;">
      <h6 class="mb-3">Chat Sessions</h6>
      <div id="session-list">
        <p class="text-muted small">No previous sessions</p>
      </div>
    </div>
  </div>
</div>

<script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
<script>
var currentSessionId = "";
var currentAgentId = document.getElementById("agent-select").value;

document.getElementById("agent-select").addEventListener("change", function() {
  currentAgentId = this.value;
});

async function loadSessions() {
  try {
    var resp = await fetch("/api/ai-interactions/sessions/");
    var sessions = await resp.json();
    var container = document.getElementById("session-list");
    if (sessions.length === 0) {
      container.innerHTML = '<p class="text-muted small">No previous sessions</p>';
      return;
    }
    container.innerHTML = "<ul class="list-unstyled mb-0">" +
      sessions.map(function(s) { return "<li class="border-bottom py-1"><a href="#" onclick="loadSession('" + s + "');return false;" class="text-decoration-none small">" + s.substring(0, 8) + "...</a></li>"; }).join("") +
      "</ul>";
  } catch(e) {
    console.log("Sessions unavailable:", e);
  }
}

async function loadSession(sessionId) {
  currentSessionId = sessionId;
  try {
    var resp = await fetch("/api/ai-interactions/?session_id=" + sessionId);
    var msgs = await resp.json();
    var container = document.getElementById("chat-messages");
    container.innerHTML = "";
    document.getElementById("welcome-msg").style.display = "none";
    msgs.forEach(function(m) {
      addMessage(m.message_role, m.message_content);
    });
    container.scrollTop = container.scrollHeight;
  } catch(e) {
    console.log("Session load error:", e);
  }
}

function addMessage(role, content) {
  var container = document.getElementById("chat-messages");
  document.getElementById("welcome-msg").style.display = "none";
  var div = document.createElement("div");
  div.className = "mb-3 " + (role === "user" ? "text-end" : "");
  var bubble = document.createElement("div");
  bubble.className = "d-inline-block p-3 rounded-3 " +
    (role === "user" ? "bg-primary text-white" : "bg-light");
  bubble.style.maxWidth = "80%";
  bubble.style.textAlign = "left";
  if (role === "assistant") {
    bubble.innerHTML = marked.parse(content);
  } else {
    bubble.textContent = content;
  }
  div.appendChild(bubble);
  container.appendChild(div);
  container.scrollTop = container.scrollHeight;
}

document.getElementById("chat-form").addEventListener("submit", async function(e) {
  e.preventDefault();
  var input = document.getElementById("chat-input");
  var message = input.value.trim();
  if (!message || !currentAgentId) return;
  input.value = "";
  addMessage("user", message);

  var historyDivs = document.querySelectorAll("#chat-messages > div");
  var history = [];
  historyDivs.forEach(function(d) {
    var bubble = d.querySelector(".d-inline-block");
    if (!bubble) return;
    var role = d.classList.contains("text-end") ? "user" : "assistant";
    history.push({ role: role, content: bubble.textContent });
  });

  try {
    var resp = await fetch("/api/ai-interactions/chat/", {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ agent_id: parseInt(currentAgentId), message: message, session_id: currentSessionId, history: history.slice(-20) }),
    });
    var data = await resp.json();
    if (data.session_id) currentSessionId = data.session_id;
    if (data.response) {
      addMessage("assistant", data.response);
    } else if (data.error) {
      addMessage("assistant", "Error: " + data.error);
    }
  } catch(e) {
    addMessage("assistant", "Connection error. Please try again.");
  }
  loadSessions();
});

function clearChat() {
  currentSessionId = "";
  document.getElementById("chat-messages").innerHTML = '<div class="text-center text-muted py-5" id="welcome-msg"><i class="bi bi-robot fs-1"></i><p class="mt-2">Select an agent and start a conversation.</p></div>';
  document.getElementById("session-list").innerHTML = '<p class="text-muted small">No previous sessions</p>';
  loadSessions();
}

loadSessions();
</script>

<style>
#chat-messages { scroll-behavior: smooth; }
#chat-messages .bg-light { background: #f0fdf4 !important; border: 1px solid #d1fae5; }
#chat-messages .bg-primary { background: #065f46 !important; }
</style>
{% endblock %}