/**
 * Utility to dynamically populate the map SVG with clue points
 * based on the total number of clues in the database
 */

/**
 * Fetches the total number of clues from the API
 * @returns {Promise<number>} The total number of clues
 */
async function fetchTotalClues() {
  try {
    const response = await fetch("/api/clues", {
      method: "GET",
      headers: {
        "Content-Type": "application/json",
        "Cache-Control": "no-store, no-cache, must-revalidate",
      },
      credentials: "include",
    });

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

    const clues = await response.json();
    return clues.length;
  } catch (error) {
    console.error("Error fetching total clues:", error);
    return 0;
  }
}

/**
 * Shows the specified number of clue points on the map
 * @param {SVGElement} svgElement - The SVG DOM element of the map
 * @param {number} numClues - Number of clues to display
 * @returns {boolean} Success status
 */
function showCluePoints(svgElement, numClues) {
  if (!svgElement || !numClues) {
    console.error("Invalid SVG element or number of clues");
    return false;
  }

  try {
    // Find all clue points in the SVG - improved selector for better compatibility
    const cluePoints = Array.from(svgElement.querySelectorAll("circle")).filter(
      (circle) =>
        circle.classList.contains("clue-point") ||
        circle.getAttribute("class")?.includes("clue-point")
    );

    console.log(`Found ${cluePoints.length} clue points in SVG`);

    // If no clue points are found, add them programmatically
    if (cluePoints.length === 0) {
      console.log("No clue points found, creating them dynamically");
      return createCluePoints(svgElement, numClues);
    }

    // Hide all clue points first
    cluePoints.forEach((circle) => {
      circle.style.display = "none";
    });

    // Show only the required number of clue points
    for (let i = 0; i < Math.min(numClues, cluePoints.length); i++) {
      const circle = cluePoints[i];
      circle.style.display = "";
      // Ensure the circle has the clue-point class and a data-clue-id
      circle.classList.add("clue-point");
      if (!circle.hasAttribute("data-clue-id")) {
        circle.setAttribute("data-clue-id", (i + 1).toString());
      }
    }

    console.log(
      `Showing ${Math.min(numClues, cluePoints.length)} clue points on map`
    );
    return true;
  } catch (error) {
    console.error("Error showing clue points:", error);
    return false;
  }
}

/**
 * Creates clue points dynamically if they don't exist in the SVG
 * @param {SVGElement} svgElement - The SVG DOM element of the map
 * @param {number} numClues - Number of clues to create
 * @returns {boolean} Success status
 */
function createCluePoints(svgElement, numClues) {
  try {
    const svgWidth = svgElement.viewBox.baseVal.width || 800;
    const svgHeight = svgElement.viewBox.baseVal.height || 600;

    // Define positions for clue points - spread across the map
    const positions = [];

    // Calculate positions in a grid pattern
    const cols = Math.ceil(Math.sqrt(numClues));
    const rows = Math.ceil(numClues / cols);

    const marginX = svgWidth * 0.1;
    const marginY = svgHeight * 0.1;
    const spacingX = (svgWidth - 2 * marginX) / (cols - 1 || 1);
    const spacingY = (svgHeight - 2 * marginY) / (rows - 1 || 1);

    for (let row = 0; row < rows; row++) {
      for (let col = 0; col < cols; col++) {
        const index = row * cols + col;
        if (index < numClues) {
          positions.push({
            x: marginX + col * spacingX,
            y: marginY + row * spacingY,
          });
        }
      }
    }

    // Create circles for each clue
    positions.forEach((pos, index) => {
      const circle = document.createElementNS(
        "http://www.w3.org/2000/svg",
        "circle"
      );
      circle.setAttribute("cx", pos.x);
      circle.setAttribute("cy", pos.y);
      circle.setAttribute("r", 10);
      circle.setAttribute("fill", "#9e9e9e");
      circle.setAttribute("stroke", "#757575");
      circle.setAttribute("stroke-width", "2");
      circle.setAttribute("class", "clue-point");
      circle.setAttribute("data-clue-id", (index + 1).toString());

      svgElement.appendChild(circle);
    });

    console.log(`Created ${numClues} clue points dynamically`);
    return true;
  } catch (error) {
    console.error("Error creating clue points:", error);
    return false;
  }
}

/**
 * Main function to populate map with the correct number of clue points
 * @param {SVGElement} svgElement - The SVG DOM element of the map
 * @returns {Promise<boolean>} Success status
 */
export async function populateMap(svgElement) {
  if (!svgElement) {
    console.error("No SVG element provided");
    return false;
  }

  try {
    console.log("Starting to populate map");
    // Fetch total number of clues
    const totalClues = await fetchTotalClues();
    console.log("Total clues fetched:", totalClues);

    if (totalClues > 0) {
      // Show the appropriate number of clue points
      return showCluePoints(svgElement, totalClues);
    } else {
      console.warn("No clues found in database");
      return false;
    }
  } catch (error) {
    console.error("Error populating map:", error);
    return false;
  }
}

/**
 * Updates the styling of clue points based on their status
 * @param {SVGElement} svgElement - The SVG DOM element of the map
 * @param {Array} clues - Array of clue objects with status information
 */
export function updateCluePointStatus(svgElement, clues) {
  if (!svgElement || !clues || !clues.length) {
    console.error("Invalid SVG element or clues data");
    return;
  }

  try {
    clues.forEach((clue, index) => {
      // Find the corresponding circle in the SVG
      const circle = svgElement.querySelector(
        `.clue-point[data-clue-id="${clue.id}"]`
      );

      if (circle) {
        // Apply appropriate styling based on clue status
        if (clue.found) {
          // Found clues are green
          circle.style.fill = "#4caf50";
          circle.style.stroke = "#2e7d32";
        } else if (clue.available) {
          // Available clues are orange
          circle.style.fill = "#ff9800";
          circle.style.stroke = "#d87f00";
        } else {
          // Unavailable clues remain grey
          circle.style.fill = "#9e9e9e";
          circle.style.stroke = "#757575";
        }
      }
    });
  } catch (error) {
    console.error("Error updating clue point status:", error);
  }
}