// Resource management for Cursebreaker map
let resourceLayerGroups = {}; // Map: resource name -> L.layerGroup
let resourceIcons = {}; // Map: resource name -> L.icon
let resourceData = {}; // Map: resource name -> resource metadata (skill, level, etc.)
let filterState = {}; // Map: resource name -> boolean (visible)

// Load resources from API
async function loadResources() {
    try {
        console.log('Loading resources from API...');
        const response = await fetch('/api/resources');

        if (!response.ok) {
            throw new Error(`HTTP error! status: ${response.status}`);
        }

        const data = await response.json();
        console.log(`Received ${data.resources.length} resource types`);

        // Create icons and layer groups for each resource
        for (const group of data.resources) {
            createResourceGroup(group);
        }

        // Initialize filter UI
        initializeFilterUI();

        // Restore filter state from localStorage
        restoreFilterState();

        console.log(`Loaded ${data.resources.length} resource types successfully`);
    } catch (error) {
        console.error('Error loading resources:', error);
        const container = document.getElementById('resource-filters');
        if (container) {
            container.innerHTML = '<p style="color: #ff6b6b;">Failed to load resources. Check console for details.</p>';
        }
    }
}

// Create resource group with icon and markers
function createResourceGroup(group) {
    const config = window.MapConfig;

    // Create icon definition (cached per resource type)
    const iconUrl = `data:image/webp;base64,${group.icon_base64}`;
    const icon = L.icon({
        iconUrl: iconUrl,
        iconSize: [config.resourceIconSize, config.resourceIconSize],
        iconAnchor: [config.resourceIconSize / 2, config.resourceIconSize / 2],
        popupAnchor: [0, -(config.resourceIconSize / 2)],
    });

    resourceIcons[group.name] = icon;

    // Store metadata
    resourceData[group.name] = {
        item_id: group.item_id,
        skill: group.skill,
        level: group.level,
    };

    // Create layer group for this resource type
    const layerGroup = L.layerGroup();

    // Add markers for all positions
    for (const pos of group.positions) {
        const marker = L.marker([pos.y, pos.x], {
            icon: icon,
            title: group.name,
        });

        // Add popup with resource details
        marker.bindPopup(
            `<strong>${group.name}</strong><br/>Position: (${pos.x.toFixed(1)}, ${pos.y.toFixed(1)})`
        );

        marker.addTo(layerGroup);
    }

    // Add to map (initially visible)
    layerGroup.addTo(map);
    resourceLayerGroups[group.name] = layerGroup;
    filterState[group.name] = true; // Initially visible
}

// Initialize filter UI with skill grouping
function initializeFilterUI() {
    const container = document.getElementById('resource-filters');
    if (!container) {
        console.error('resource-filters container not found');
        return;
    }

    container.innerHTML = ''; // Clear loading text

    // Group resources by skill
    const skillGroups = {};
    for (const name in resourceLayerGroups) {
        const metadata = resourceData[name];
        if (!skillGroups[metadata.skill]) {
            skillGroups[metadata.skill] = [];
        }
        skillGroups[metadata.skill].push({
            name: name,
            level: metadata.level,
        });
    }

    // Sort skills alphabetically
    const sortedSkills = Object.keys(skillGroups).sort();

    // Create UI for each skill group
    for (const skill of sortedSkills) {
        const skillDiv = document.createElement('div');
        skillDiv.className = 'skill-group';

        const header = document.createElement('div');
        header.className = 'skill-header';
        // Capitalize first letter of skill
        header.textContent = skill.charAt(0).toUpperCase() + skill.slice(1);
        skillDiv.appendChild(header);

        // Resources are already sorted by level in backend, but sort again to be sure
        skillGroups[skill].sort((a, b) => a.level - b.level);

        // Create checkbox for each resource
        for (const resource of skillGroups[skill]) {
            const label = createFilterLabel(resource.name);
            skillDiv.appendChild(label);
        }

        container.appendChild(skillDiv);
    }

    // Attach bulk filter handlers
    const selectAllBtn = document.getElementById('select-all-resources');
    const deselectAllBtn = document.getElementById('deselect-all-resources');

    if (selectAllBtn) {
        selectAllBtn.addEventListener('click', () => {
            setAllFilters(true);
        });
    }

    if (deselectAllBtn) {
        deselectAllBtn.addEventListener('click', () => {
            setAllFilters(false);
        });
    }
}

// Create filter label with checkbox and icon
function createFilterLabel(resourceName) {
    const label = document.createElement('label');
    label.className = 'filter-label';

    const checkbox = document.createElement('input');
    checkbox.type = 'checkbox';
    checkbox.checked = filterState[resourceName];
    checkbox.dataset.resource = resourceName;
    checkbox.addEventListener('change', handleFilterChange);

    const icon = document.createElement('img');
    icon.src = resourceIcons[resourceName].options.iconUrl;
    icon.className = 'filter-icon';
    icon.alt = resourceName;

    const text = document.createElement('span');
    text.textContent = resourceName;

    label.appendChild(checkbox);
    label.appendChild(icon);
    label.appendChild(text);

    return label;
}

// Handle filter checkbox change
function handleFilterChange(event) {
    const resourceName = event.target.dataset.resource;
    const isVisible = event.target.checked;

    filterState[resourceName] = isVisible;

    // Show/hide layer group
    const layerGroup = resourceLayerGroups[resourceName];
    if (isVisible) {
        layerGroup.addTo(map);
    } else {
        map.removeLayer(layerGroup);
    }

    // Persist state
    saveFilterState();
}

// Set all filters to visible or hidden
function setAllFilters(visible) {
    for (const name in filterState) {
        filterState[name] = visible;
        const layerGroup = resourceLayerGroups[name];

        if (visible) {
            layerGroup.addTo(map);
        } else {
            map.removeLayer(layerGroup);
        }
    }

    // Update checkboxes
    document.querySelectorAll('#resource-filters input[type="checkbox"]').forEach((cb) => {
        cb.checked = visible;
    });

    saveFilterState();
}

// Save filter state to localStorage
function saveFilterState() {
    try {
        localStorage.setItem('cursebreaker_resource_filters', JSON.stringify(filterState));
    } catch (error) {
        console.warn('Failed to save filter state to localStorage:', error);
    }
}

// Restore filter state from localStorage
function restoreFilterState() {
    const saved = localStorage.getItem('cursebreaker_resource_filters');
    if (!saved) return;

    try {
        const savedState = JSON.parse(saved);

        for (const name in savedState) {
            if (resourceLayerGroups[name]) {
                filterState[name] = savedState[name];

                const layerGroup = resourceLayerGroups[name];
                if (!savedState[name]) {
                    map.removeLayer(layerGroup);
                }
            }
        }

        // Update checkboxes after UI is created
        setTimeout(() => {
            document.querySelectorAll('#resource-filters input[type="checkbox"]').forEach((cb) => {
                const name = cb.dataset.resource;
                if (filterState[name] !== undefined) {
                    cb.checked = filterState[name];
                }
            });
        }, 100);

        console.log('Restored filter state from localStorage');
    } catch (error) {
        console.warn('Failed to restore filter state:', error);
    }
}