/**
 * Utility module for processing and populating the treasure map SVG.
 */

// Global variable to track if we've added our custom styles
let stylesAdded = false;

/**
 * Adds custom styles to the document head for clue points
 */
function addCustomStyles() {
  if (stylesAdded) return;

  const style = document.createElement("style");
  style.id = "map-custom-styles";
  style.textContent = `
    @keyframes cluePointPulse {
      0% { stroke-width: 3px; transform: scale(1); filter: drop-shadow(0px 0px 3px rgba(255, 152, 0, 0.9)); }
      50% { stroke-width: 6px; transform: scale(1.2); filter: drop-shadow(0px 0px 10px rgba(255, 152, 0, 1)); }
      100% { stroke-width: 3px; transform: scale(1); filter: drop-shadow(0px 0px 3px rgba(255, 152, 0, 0.9)); }
    }
    
    /* Force all SVG elements to be transparent to mouse events by default */
    svg * {
      pointer-events: none;
    }
    
    /* Create a stacking context for the overlay */
    .clue-points-overlay {
      pointer-events: all !important;
      position: relative !important;
      z-index: 9999 !important;
    }
    
    /* Make clue points highly visible with strong styling */
    .clue-point {
      r: 14 !important;
      cursor: pointer !important;
      stroke-width: 3px !important;
      pointer-events: all !important;
      z-index: 9999 !important;
      position: relative !important;
      fill-opacity: 1 !important;
      stroke-opacity: 1 !important;
      filter: drop-shadow(0px 0px 3px rgba(0, 0, 0, 0.7)) !important;
    }
    
    .clue-point:hover {
      fill: #ffb74d !important;
      stroke: #ff6d00 !important;
      stroke-width: 5px !important;
      transform: scale(1.3) !important;
      z-index: 10000 !important;
      filter: drop-shadow(0px 0px 6px rgba(0, 0, 0, 0.8)) !important;
    }
    
    .clue-point-found {
      fill: #2e7d32 !important;
      stroke: #1b5e20 !important;
    }
    
    .clue-point-current {
      fill: #ff9800 !important;
      stroke: #e65100 !important;
      animation: cluePointPulse 2s infinite !important;
    }
    
    .clue-point-skipped {
      fill: #1976d2 !important;
      stroke: #0d47a1 !important;
    }
    
    .clue-point-locked {
      fill: #9e9e9e !important;
      stroke: #757575 !important;
    }
    
    .clue-click-area {
      opacity: 0.01;
      fill: transparent !important;
      stroke: transparent !important;
      pointer-events: all !important;
      cursor: pointer !important;
      z-index: 9998 !important;
    }
  `;

  document.head.appendChild(style);
  stylesAdded = true;
  console.log("Custom map styles added to document");
}

/**
 * Populates the SVG map with clue points
 * @param {SVGElement} svgElement - The SVG DOM element to process
 * @returns {Promise<boolean>} - Success flag
 */
export async function populateMap(svgElement) {
  try {
    console.log("Starting map population process");

    // Add custom styles to document if not already added
    addCustomStyles();

    if (!svgElement) {
      console.error("No SVG element provided");
      return false;
    }

    // Clear any existing clue points and click areas to avoid duplicates
    const existingCluePoints = svgElement.querySelectorAll(
      ".clue-point, .clue-click-area, .clue-points-overlay"
    );
    existingCluePoints.forEach((element) => {
      if (element.parentNode) {
        element.parentNode.removeChild(element);
      }
    });

    console.log("Cleared existing clue points");

    // Find all circles in the SVG
    const allCircles = Array.from(svgElement.querySelectorAll("circle"));
    console.log(`Found ${allCircles.length} circles in SVG`);

    if (allCircles.length === 0) {
      console.error("No circles found in SVG. Creating fallback circles.");

      // Create some fallback circles at predefined positions
      const defs = document.createElementNS(
        "http://www.w3.org/2000/svg",
        "defs"
      );
      const positions = [
        { x: 100, y: 100 },
        { x: 200, y: 150 },
        { x: 300, y: 200 },
        { x: 400, y: 300 },
        { x: 500, y: 400 },
        { x: 600, y: 500 },
      ];

      positions.forEach((pos, i) => {
        const circle = document.createElementNS(
          "http://www.w3.org/2000/svg",
          "circle"
        );
        circle.setAttribute("cx", pos.x.toString());
        circle.setAttribute("cy", pos.y.toString());
        circle.setAttribute("r", "5");
        circle.setAttribute("fill", "transparent");
        defs.appendChild(circle);
      });

      // Add the defs to the SVG
      svgElement.appendChild(defs);

      // Now find all circles again
      const fallbackCircles = Array.from(defs.querySelectorAll("circle"));
      if (fallbackCircles.length > 0) {
        console.log(`Created ${fallbackCircles.length} fallback circles`);
        return await processCircles(svgElement, fallbackCircles);
      } else {
        return false;
      }
    } else {
      return await processCircles(svgElement, allCircles);
    }
  } catch (error) {
    console.error("Error populating map:", error);
    return false;
  }
}

/**
 * Process circles to create clue points
 * @param {SVGElement} svgElement - The SVG DOM element
 * @param {Array} circles - Array of circle elements
 * @returns {Promise<boolean>} - Success flag
 */
async function processCircles(svgElement, circles) {
  try {
    // Hide original circles
    circles.forEach((circle) => (circle.style.display = "none"));

    // Fetch the number of clues from the API
    const response = await fetch("/api/clues/count", {
      method: "GET",
      credentials: "include",
      headers: {
        "Cache-Control": "no-cache, no-store, must-revalidate",
        Pragma: "no-cache",
      },
    });

    if (!response.ok) {
      throw new Error(`Failed to fetch clue count: ${response.status}`);
    }

    const data = await response.json();
    const clueCount = parseInt(data.count, 10) || 0;
    console.log(`API returned clue count: ${clueCount}`);

    if (clueCount <= 0) {
      console.error("Invalid clue count returned from API, using default of 5");
      clueCount = 5; // Fallback to 5 clues if API returns invalid data
    }

    // Sort circles by vertical position (top to bottom)
    const sortedCircles = circles.sort((a, b) => {
      const aY = parseFloat(a.getAttribute("cy") || "0");
      const bY = parseFloat(b.getAttribute("cy") || "0");
      return aY - bY;
    });

    // Determine how many circles to show
    const circlesToShow = Math.min(sortedCircles.length, clueCount);
    console.log(`Will create ${circlesToShow} clue points from sorted circles`);

    // Create the overlay element that will go on top of everything
    const svgNamespace = "http://www.w3.org/2000/svg";

    // Remove any old overlay group
    const oldOverlay = svgElement.querySelector(".clue-points-overlay");
    if (oldOverlay && oldOverlay.parentNode) {
      oldOverlay.parentNode.removeChild(oldOverlay);
    }

    // Create a new overlay group that will be the last child of the SVG
    // so it renders on top of everything else
    const overlayGroup = document.createElementNS(svgNamespace, "g");
    overlayGroup.setAttribute("class", "clue-points-overlay");
    overlayGroup.setAttribute(
      "style",
      "pointer-events: all !important; z-index: 9999 !important;"
    );

    // Add the overlay group as the LAST element in the SVG to ensure proper rendering order
    svgElement.appendChild(overlayGroup);

    // Create interactive clue points
    for (let i = 0; i < circlesToShow; i++) {
      const originalCircle = sortedCircles[i];

      // Get original circle attributes
      const cx = originalCircle.getAttribute("cx") || "0";
      const cy = originalCircle.getAttribute("cy") || "0";
      const r = Math.max(
        parseFloat(originalCircle.getAttribute("r") || "5"),
        14
      );

      // Create a click area (larger invisible circle for easier clicking)
      const clickArea = document.createElementNS(svgNamespace, "circle");
      clickArea.setAttribute("cx", cx);
      clickArea.setAttribute("cy", cy);
      clickArea.setAttribute("r", (r * 2).toString());
      clickArea.setAttribute("class", "clue-click-area");
      clickArea.setAttribute("data-clue-id", (i + 1).toString());
      clickArea.setAttribute("data-index", i.toString());
      clickArea.setAttribute(
        "style",
        "opacity: 0.01; pointer-events: all !important; cursor: pointer !important; z-index: 9998 !important;"
      );

      // Create a new visible circle for the clue point with explicit inline styles
      const cluePoint = document.createElementNS(svgNamespace, "circle");
      cluePoint.setAttribute("cx", cx);
      cluePoint.setAttribute("cy", cy);
      cluePoint.setAttribute("r", r.toString());
      cluePoint.setAttribute("class", "clue-point clue-point-locked");
      cluePoint.setAttribute("data-clue-id", (i + 1).toString());
      cluePoint.setAttribute("data-index", i.toString());
      cluePoint.setAttribute(
        "style",
        "fill: #9e9e9e; stroke: #757575; stroke-width: 3px; cursor: pointer; " +
          "pointer-events: all !important; z-index: 9999 !important; position: relative !important; " +
          "fill-opacity: 1 !important; stroke-opacity: 1 !important; " +
          "filter: drop-shadow(0px 0px 3px rgba(0, 0, 0, 0.7));"
      );

      // Add a tooltip for accessibility
      const tooltip = document.createElementNS(svgNamespace, "title");
      tooltip.textContent = `Clue #${i + 1}`;
      cluePoint.appendChild(tooltip);

      // Add the new elements to the overlay group
      overlayGroup.appendChild(clickArea);
      overlayGroup.appendChild(cluePoint);
    }

    // Set explicit width and height on the overlay group to ensure it covers the whole SVG
    const svgWidth = svgElement.getAttribute("width") || "100%";
    const svgHeight = svgElement.getAttribute("height") || "100%";
    overlayGroup.setAttribute("width", svgWidth);
    overlayGroup.setAttribute("height", svgHeight);

    // Bring the overlay forward by appending it again
    // This ensures it's the last child of the SVG
    svgElement.appendChild(overlayGroup);

    console.log(`Successfully created ${circlesToShow} clue points`);
    return true;
  } catch (error) {
    console.error("Error processing circles:", error);
    return false;
  }
}

/**
 * Updates the clue points based on the latest clue data
 * @param {SVGElement} svgElement - The SVG DOM element
 * @param {Array} clues - Array of clue objects with their status
 */
export function updateCluePointStatus(svgElement, clues) {
  try {
    if (!svgElement || !clues || !Array.isArray(clues) || clues.length === 0) {
      console.error("Invalid parameters for updateCluePointStatus");
      return false;
    }

    console.log(`Updating status for ${clues.length} clues`);

    // Find all clue points
    const cluePoints = svgElement.querySelectorAll(".clue-point");
    const clickAreas = svgElement.querySelectorAll(".clue-click-area");

    if (cluePoints.length === 0) {
      console.error("No clue points found to update");
      return false;
    }

    console.log(
      `Found ${cluePoints.length} clue points and ${clickAreas.length} click areas to update`
    );

    // Find the first unfound clue (the current clue)
    const currentIndex = clues.findIndex((clue) => !clue.found);
    const currentClueId = currentIndex !== -1 ? clues[currentIndex].id : null;

    console.log(`Current clue ID: ${currentClueId}`);

    // Update each clue point's status
    cluePoints.forEach((point, index) => {
      if (index >= clues.length) return;

      const clue = clues[index];
      const clueId = clue.id;

      // Remove all status classes first
      point.classList.remove(
        "clue-point-found",
        "clue-point-current",
        "clue-point-skipped",
        "clue-point-locked"
      );

      // Update tooltip
      const tooltip =
        point.querySelector("title") ||
        document.createElementNS("http://www.w3.org/2000/svg", "title");

      // Determine the clue's status and apply appropriate class
      if (clue.found) {
        point.classList.add("clue-point-found");
        tooltip.textContent = `Clue ${clueId}: ${clue.title || "Completed"}`;
      } else if (clueId === currentClueId) {
        point.classList.add("clue-point-current");
        tooltip.textContent = `Current Clue: ${
          clue.title || "Go to this location"
        }`;
      } else if (clueId < currentClueId) {
        point.classList.add("clue-point-skipped");
        tooltip.textContent = `Skipped Clue ${clueId}: ${
          clue.title || "Skipped"
        }`;
      } else {
        point.classList.add("clue-point-locked");
        tooltip.textContent = `Locked: Complete previous clues first`;
      }

      // Store availability data
      const isAvailable = clue.found || clueId === currentClueId;
      point.setAttribute("data-available", isAvailable.toString());

      // Make sure tooltip is attached
      if (!point.contains(tooltip)) {
        point.appendChild(tooltip);
      }
    });

    console.log("Clue point status updated successfully");
    return true;
  } catch (error) {
    console.error("Error updating clue point status:", error);
    return false;
  }
}

/**
 * Attaches click handlers to clue points
 * @param {SVGElement} svgElement - The SVG DOM element
 * @param {Array} clues - Array of clue objects with their status
 * @param {Function} navigationHandler - Function to handle navigation
 */
export function attachClueClickHandlers(svgElement, clues, navigationHandler) {
  try {
    if (!svgElement || !clues || !navigationHandler) {
      console.error("Invalid parameters for attachClueClickHandlers");
      return false;
    }

    // Get all interactive elements (clue points and their click areas)
    const cluePoints = Array.from(svgElement.querySelectorAll(".clue-point"));
    const clickAreas = Array.from(
      svgElement.querySelectorAll(".clue-click-area")
    );

    console.log(
      `Attaching click handlers to ${cluePoints.length} clue points and ${clickAreas.length} click areas`
    );

    // Find the current active clue
    const currentIndex = clues.findIndex((clue) => !clue.found);

    // Helper function to process a click on a clue point
    const processClueClick = (element) => {
      const index = parseInt(element.getAttribute("data-index"), 10);
      if (isNaN(index) || index < 0 || index >= clues.length) {
        console.error(`Invalid clue index: ${index}`);
        return;
      }

      const clue = clues[index];
      const isAvailable = clue.found || index === currentIndex;

      console.log(`Clue ${clue.id} clicked, available: ${isAvailable}`);

      if (isAvailable) {
        // Show click feedback
        const cluePoint = cluePoints[index];
        if (cluePoint) {
          // Briefly change color for visual feedback
          const originalClasses = [...cluePoint.classList];
          cluePoint.classList.add("click-feedback");

          setTimeout(() => {
            // Navigate to the clue page
            navigationHandler(clue.id);
          }, 100);
        } else {
          navigationHandler(clue.id);
        }
      } else {
        // Alert about locked clue
        alert("Complete previous clues to unlock this one!");
      }
    };

    // Attach new click handlers to clue points
    cluePoints.forEach((point) => {
      // Remove existing handlers
      point.onclick = null;

      // Add new click handler
      point.addEventListener("click", (e) => {
        e.preventDefault();
        e.stopPropagation();
        processClueClick(point);
      });
    });

    // Attach click handlers to click areas (larger invisible circles)
    clickAreas.forEach((area) => {
      // Remove existing handlers
      area.onclick = null;

      // Add new click handler - these use the same handler as clue points
      area.addEventListener("click", (e) => {
        e.preventDefault();
        e.stopPropagation();
        processClueClick(area);
      });
    });

    console.log("Click handlers attached successfully");
    return true;
  } catch (error) {
    console.error("Error attaching click handlers:", error);
    return false;
  }
}