// === Dynamic Model Fetching ===
let MODEL_LIST = [];

async function fetchModelList() {
  try {
    const response = await fetch("/models");
    if (response.ok) {
      MODEL_LIST = await response.json();
      initializeDropdowns();
    } else {
      console.error("Failed to fetch model list");
    }
  } catch (error) {
    console.error("Error fetching models:", error);
  }
}

// === Create Custom Dropdowns Dynamically ===
function createDropdown(dropdownId) {
  const dropdown = document.getElementById(dropdownId);
  const selected = dropdown.querySelector(".selected");
  const options = dropdown.querySelector(".options");
  const modelZone = dropdown.closest(".model-zone");
  const nameDisplay = modelZone.querySelector(".model-name");

  MODEL_LIST.forEach(model => {
    const option = document.createElement("div");
    option.className = "p-2 hover:bg-visual_green rounded cursor-pointer";
    option.textContent = model.name;
    option.dataset.value = model.id;
    options.appendChild(option);

    option.addEventListener("click", (e) => {
      e.stopPropagation();
      selected.textContent = model.name;
      dropdown.dataset.value = model.id;
      if (nameDisplay) {
        nameDisplay.textContent = model.name;
        nameDisplay.classList.remove("hidden");
      }
      options.classList.add("hidden");
    });
  });

  selected.addEventListener("click", (e) => {
    e.stopPropagation();
    options.classList.toggle("hidden");
  });

  options.addEventListener("mouseleave", () => {
    options.classList.add("hidden");
  });

  document.addEventListener("click", (e) => {
    if (!dropdown.contains(e.target)) {
      options.classList.add("hidden");
    }
  });
}

// === Initialize All Dropdowns After Fetch ===
function initializeDropdowns() {
  createDropdown("modelA");
  createDropdown("modelB");
  createDropdown("modelC");
  createDropdown("aggregator");
}

// === Theme, Config and Docs Buttons ===
const themeToggle = document.getElementById("themeToggle");
const toggleConfig = document.getElementById("toggleConfig");
const docsButton = document.getElementById("docsButton");
const configPanel = document.getElementById("configPanel");
const html = document.documentElement;

function setInitialTheme() {
  const savedTheme = localStorage.getItem("theme");
  if (savedTheme === "dark") {
    html.classList.add("dark");
    themeToggle.textContent = "🌙";
  } else if (savedTheme === "light") {
    html.classList.remove("dark");
    themeToggle.textContent = "☀️";
  } else {
    const prefersDark = window.matchMedia("(prefers-color-scheme: dark)").matches;
    if (prefersDark) {
      html.classList.add("dark");
      themeToggle.textContent = "🌙";
    } else {
      html.classList.remove("dark");
      themeToggle.textContent = "☀️";
    }
  }
}

setInitialTheme();

themeToggle.addEventListener("click", () => {
  const isDark = html.classList.toggle("dark");
  localStorage.setItem("theme", isDark ? "dark" : "light");
  themeToggle.textContent = isDark ? "🌙" : "☀️";
});

toggleConfig.addEventListener("click", () => {
  if (configPanel.classList.contains("minimal")) {
    configPanel.classList.remove("minimal");
    configPanel.classList.add("expanded");
  } else if (configPanel.classList.contains("expanded")) {
    configPanel.classList.remove("expanded");
    configPanel.classList.add("minimal");
  } else {
    configPanel.classList.add("expanded");
    configPanel.classList.remove("hidden");
  }
});

docsButton.addEventListener("click", () => {
  window.location.href = "/docs";
});

// === Per-model Loader Control ===
function showLoader(id) {
  const loader = document.getElementById(`loader${id}`);
  const modelZone = loader.closest(".model-zone");
  loader.classList.remove("hidden");
  modelZone.classList.add("loading");
  loader.innerHTML = `
    <div class="dot bg-aqua"></div>
    <div class="dot bg-aqua animation-delay-150"></div>
    <div class="dot bg-aqua animation-delay-300"></div>
  `;
}

function hideLoader(id) {
  const loader = document.getElementById(`loader${id}`);
  const modelZone = loader.closest(".model-zone");
  loader.classList.add("hidden");
  modelZone.classList.remove("loading");
  loader.innerHTML = "";
}

// === Chat Handling ===
const chatForm = document.getElementById("chatForm");
const userInput = document.getElementById("userInput");
const chatContainer = document.getElementById("chatContainer");

function appendMessage(role, text) {
  const div = document.createElement("div");
  div.className = `p-3 rounded shadow max-w-2xl ${role === "user" ? "bg-blue text-fg0 self-end" : "bg-green text-fg0 self-start"}`;
  div.innerText = text;
  chatContainer.appendChild(div);
  chatContainer.scrollTop = chatContainer.scrollHeight;
}

chatForm.addEventListener("submit", async (e) => {
  e.preventDefault();
  const prompt = userInput.value.trim();
  if (!prompt) return;

  appendMessage("user", prompt);
  userInput.value = "";

  configPanel.classList.remove("expanded");
  configPanel.classList.add("minimal");

  const selections = {
    "LLM-A": document.getElementById("modelA").dataset.value,
    "LLM-B": document.getElementById("modelB").dataset.value,
    "LLM-C": document.getElementById("modelC").dataset.value,
    "LLM-D": document.getElementById("aggregator").dataset.value
  };

  ["A", "B", "C"].forEach(id => showLoader(id));

  const settings = {
    models: {
      "LLM-A": selections["LLM-A"],
      "LLM-B": selections["LLM-B"],
      "LLM-C": selections["LLM-C"]
    },
    aggregator: selections["LLM-D"]
  };

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

    if (response.ok) {
      const data = await response.json();
      appendMessage("bot", data.response);
    } else {
      appendMessage("bot", "An error occurred. Please check your model selections.");
    }
  } catch (error) {
    appendMessage("bot", "An unexpected error occurred.");
  } finally {
    ["A", "B", "C", "D"].forEach(id => hideLoader(id));
  }
});

// === Kickstart ===
fetchModelList();