import { getScene } from "./api";
import { loadSidebar } from "./scene/sidebar";
import { loadNavbar } from "./scene/navbar";

import aframe from "aframe";

import 'bootstrap/dist/js/bootstrap.bundle.min.js';
import "@phosphor-icons/web/light";

import "../scss/frontend.scss";
import "../css/scene.css";

// Scene loading state tracking
const loadingStates = new Map();

AFRAME.registerComponent('billboard', {
  tick: function () {
    const camera = document.querySelector('a-camera');
    if (!camera) return;

    // Make this entity face the camera
    this.el.object3D.lookAt(camera.object3D.position);
  }
});

// Define the <quackscape-scene> element
class QuackscapeScene extends HTMLElement {
  connectedCallback() {
    this.scene = this.getAttribute("scene");
    this.embedded = this.hasAttribute("embedded");
    this.x = parseInt(this.getAttribute("x")) || 0;
    this.y = parseInt(this.getAttribute("y")) || 0;
    this.z = parseInt(this.getAttribute("z")) || 0;
    this.navbar = this.hasAttribute("navbar");
    this.sidebar = this.hasAttribute("sidebar");

    // Show loading indicator
    this.showLoadingIndicator();

    // Load the scene
    loadScene(this.scene, this.x, this.y, this.z, this, this.embedded)
      .then(() => {
        // Scene loaded successfully
        this.hideLoadingIndicator();

        // Dispatch a loaded event
        const loadedEvent = new CustomEvent("sceneLoaded", {
          detail: { sceneId: this.scene }
        });
        this.dispatchEvent(loadedEvent);
      })
      .catch(error => {
        console.error("Error loading scene:", error);
        this.showErrorIndicator(error);
      });

    // Load UI components if needed
    if (this.navbar) {
      loadNavbar(this.scene, this);
    } else if (this.sidebar) {
      loadSidebar(this.scene, this);
    }
  }

  showLoadingIndicator() {
    // Create and show loading indicator
    const loadingEl = document.createElement("div");
    loadingEl.className = "scene-loading";
    loadingEl.innerHTML = `
      <div class="loading-animation">
        <div class="loading-spinner"></div>
      </div>
      <div class="loading-text">Loading scene...</div>
    `;
    this.appendChild(loadingEl);
    this.loadingIndicator = loadingEl;
  }

  hideLoadingIndicator() {
    if (this.loadingIndicator) {
      this.loadingIndicator.classList.add("loaded");
      // Remove after animation completes
      setTimeout(() => {
        if (this.loadingIndicator && this.loadingIndicator.parentNode) {
          this.loadingIndicator.parentNode.removeChild(this.loadingIndicator);
        }
      }, 500);
    }
  }

  showErrorIndicator(error) {
    if (this.loadingIndicator) {
      this.loadingIndicator.innerHTML = `
        <div class="error-icon">
          <i class="ph-light ph-warning"></i>
        </div>
        <div class="error-text">Failed to load scene</div>
        <div class="error-details">${error.message || "Unknown error"}</div>
        <button class="btn btn-primary retry-btn">Retry</button>
      `;

      // Add retry functionality
      const retryBtn = this.loadingIndicator.querySelector(".retry-btn");
      if (retryBtn) {
        retryBtn.addEventListener("click", () => {
          this.hideLoadingIndicator();
          this.showLoadingIndicator();
          loadScene(this.scene, this.x, this.y, this.z, this, this.embedded)
            .then(() => this.hideLoadingIndicator())
            .catch(err => this.showErrorIndicator(err));
        });
      }
    }
  }
}

// Register the custom element
customElements.define("quackscape-scene", QuackscapeScene);

// Prevent context menu in scene for better mobile experience
document.addEventListener("contextmenu", function (event) {
  const isScene = event.target.closest("a-scene");
  if (isScene) {
    event.preventDefault();
  }
});

// Function to load a scene into a destination object
async function loadScene(
  scene_id,
  x = 0,
  y = 0,
  z = 0,
  destination = null,
  embedded = false
) {
  // Check if we're already loading this scene
  if (loadingStates.has(scene_id) && loadingStates.get(scene_id).loading) {
    return loadingStates.get(scene_id).promise;
  }

  // Create a promise to track loading state
  let resolvePromise, rejectPromise;
  const promise = new Promise((resolve, reject) => {
    resolvePromise = resolve;
    rejectPromise = reject;
  });

  // Set loading state
  loadingStates.set(scene_id, {
    loading: true,
    promise
  });

  try {
    // Get WebGL maximum texture size
    const gl = getWebGLContext();
    if (!gl) {
      throw new Error("WebGL not supported by your browser");
    }

    const maxTextureSize = getMaxTextureSize(gl);

    // Get scene information from API
    const response = await getScene(scene_id);
    const scene = response.obj;

    // Find appropriate resolution
    const content = findBestResolution(scene.base_content.resolutions, maxTextureSize);
    if (!content) {
      throw new Error("No suitable resolution found for this device");
    }

    // Select a destination element if not specified
    if (!destination) {
      destination = document.querySelector("quackscape-scene") || document.body;
    }

    destination.setAttribute("id", scene_id);

    // Remove any existing scenes
    const existingScene = destination.querySelector("a-scene");
    if (existingScene) {
      existingScene.remove();
    }

    // Create the A-Frame scene
    const a_scene = createAFrameScene(embedded);

    // Create camera rig with proper rotation
    const rig = createCameraRig(x, y, z);
    a_scene.appendChild(rig);

    // Create assets container
    const assets = document.createElement("a-assets");

    // Add background image
    const background = document.createElement("img");
    background.setAttribute("id", content.id);
    background.setAttribute("src", content.file);
    background.setAttribute("crossorigin", "anonymous");

    // Add loading event handlers
    background.addEventListener("load", () => {
      console.log("Background image loaded successfully");
    });

    background.addEventListener("error", (e) => {
      console.error("Error loading background image:", e);
      rejectPromise(new Error("Failed to load background image"));
    });

    assets.appendChild(background);
    a_scene.appendChild(assets);

    // Add sky with background image
    const sky = document.createElement("a-sky");
    sky.setAttribute("src", `#${content.id}`);
    sky.setAttribute("rotation", "0 0 0");
    sky.setAttribute("data-clickable", "");
    a_scene.appendChild(sky);

    // Add elements to scene
    scene.elements.forEach((element) => {
      const node = document.createElement(element.data.tag);
      node.setAttribute("id", element.data.id);

      for (const [key, value] of Object.entries(element.data.attributes)) {
        node.setAttribute(key, value);
      }

      // Add children elements if they exist
      if (element.data.children && Array.isArray(element.data.children)) {
        element.data.children.forEach(child => {
          const childNode = document.createElement(child.tag);
          
          // Set attributes on child
          for (const [key, value] of Object.entries(child.attributes || {})) {
            childNode.setAttribute(key, value);
          }
          
          node.appendChild(childNode);
        });
      }

      a_scene.appendChild(node);
    });

    // Add scene to destination
    destination.appendChild(a_scene);

    // Wait for scene to load
    a_scene.addEventListener("loaded", function () {
      console.log("A-Frame scene loaded");

      // Update scene title in overlay if we have stored title
      if (window.selectedSceneTitle) {
        const titleOverlay = document.getElementById("sceneTitleOverlay");
        if (titleOverlay) {
          const titleElement = titleOverlay.querySelector("h1");
          const categoryElement = titleOverlay.querySelector("p");

          if (titleElement) {
            titleElement.textContent = window.selectedSceneTitle;
          }

          if (categoryElement && window.selectedSceneCategory) {
            categoryElement.textContent = window.selectedSceneCategory;
          }

          // Show title overlay
          titleOverlay.classList.add("visible");

          // Hide after delay
          setTimeout(() => {
            titleOverlay.classList.remove("visible");
          }, 3000);

          // Clear stored title after using it
          window.selectedSceneTitle = null;
          window.selectedSceneCategory = null;
        }
      }

      // Dispatch a signal for the editor to pick up
      const loaded_event = new CustomEvent("loadedQuackscapeScene", {
        detail: { sceneId: scene_id }
      });
      document.dispatchEvent(loaded_event);

      // Update loading state
      loadingStates.set(scene_id, { loading: false });
      resolvePromise();
    });

    return promise;
  } catch (error) {
    console.error("Error in loadScene:", error);
    loadingStates.set(scene_id, { loading: false });
    rejectPromise(error);
    throw error;
  }
}

// Helper functions
function getWebGLContext() {
  const canvas = document.createElement("canvas");
  return canvas.getContext("webgl") || canvas.getContext("experimental-webgl");
}

function getMaxTextureSize(gl) {
  let maxTextureSize = gl.getParameter(gl.MAX_TEXTURE_SIZE);

  // iOS devices have issues with very large textures
  const iOS = /iPad|iPhone|iPod/.test(navigator.userAgent);
  if (iOS) {
    maxTextureSize = Math.min(8192, maxTextureSize);
  }

  return maxTextureSize;
}

function findBestResolution(resolutions, maxTextureSize) {
  // Sort resolutions by width (largest first)
  const sortedResolutions = [...resolutions].sort((a, b) => b.width - a.width);

  // Find the largest resolution that fits within maxTextureSize
  return sortedResolutions.find(resolution => resolution.width <= maxTextureSize) ||
    sortedResolutions[sortedResolutions.length - 1]; // Fallback to smallest if none fit
}

function createAFrameScene(embedded) {
  const a_scene = document.createElement("a-scene");
  a_scene.setAttribute("cursor", "rayOrigin: mouse");
  a_scene.setAttribute("raycaster", "objects: [data-clickable]; far: 100");

  if (embedded) {
    a_scene.setAttribute("embedded", "true");
    a_scene.setAttribute("vr-mode-ui", "enabled: false");
  }

  // Add loading screen
  a_scene.setAttribute("loading-screen", "dotsColor: #4F46E5; backgroundColor: #FFFFFF");

  return a_scene;
}

function createCameraRig(x, y, z) {
  const rig = document.createElement("a-entity");
  rig.setAttribute("id", "rig");

  // Set rotation if specified
  if (x !== -1 && y !== -1 && z !== -1) {
    rig.setAttribute("rotation", `${x} ${y} ${z}`);
  }

  const camera = document.createElement("a-camera");
  camera.setAttribute("wasd-controls-enabled", "false");
  camera.setAttribute("look-controls", "reverseMouseDrag: false");

  rig.appendChild(camera);
  return rig;
}

// Make functions available globally
window.loadScene = loadScene;
window.aframe = aframe;

export { loadScene };