// View Models for SPORE UI Components

// Cluster View Model with enhanced state preservation
class ClusterViewModel extends ViewModel {
    constructor() {
        super();
        this.setMultiple({
            members: [],
            primaryNode: null,
            totalNodes: 0,
            clientInitialized: false,
            isLoading: false,
            error: null,
            expandedCards: new Map(),
            activeTabs: new Map(), // Store active tab for each node
            lastUpdateTime: null
        });
        
        // Initialize cluster status after a short delay to allow components to subscribe
        setTimeout(() => {
            this.updatePrimaryNodeDisplay();
        }, 100);
    }

    // Update cluster members with state preservation
    async updateClusterMembers() {
        try {
            console.log('ClusterViewModel: updateClusterMembers called');
            
            // Store current UI state before update
            const currentUIState = this.getAllUIState();
            const currentExpandedCards = this.get('expandedCards');
            const currentActiveTabs = this.get('activeTabs');
            
            this.set('isLoading', true);
            this.set('error', null);
            
            console.log('ClusterViewModel: Fetching cluster members...');
            const response = await window.apiClient.getClusterMembers();
            console.log('ClusterViewModel: Got response:', response);
            
            // Use batch update to preserve UI state
            this.batchUpdate({
                members: response.members || [],
                lastUpdateTime: new Date().toISOString()
            }, { preserveUIState: true });
            
            // Restore expanded cards and active tabs
            this.set('expandedCards', currentExpandedCards);
            this.set('activeTabs', currentActiveTabs);
            
            // Update primary node display
            console.log('ClusterViewModel: Updating primary node display...');
            await this.updatePrimaryNodeDisplay();
            
        } catch (error) {
            console.error('ClusterViewModel: Failed to fetch cluster members:', error);
            this.set('error', error.message);
        } finally {
            this.set('isLoading', false);
            console.log('ClusterViewModel: updateClusterMembers completed');
        }
    }

    // Update primary node display with state preservation
    async updatePrimaryNodeDisplay() {
        try {
            const discoveryInfo = await window.apiClient.getDiscoveryInfo();
            
            // Use batch update to preserve UI state
            const updates = {};
            
            if (discoveryInfo.primaryNode) {
                updates.primaryNode = discoveryInfo.primaryNode;
                updates.clientInitialized = discoveryInfo.clientInitialized;
                updates.totalNodes = discoveryInfo.totalNodes;
            } else if (discoveryInfo.totalNodes > 0) {
                updates.primaryNode = discoveryInfo.nodes[0]?.ip;
                updates.clientInitialized = false;
                updates.totalNodes = discoveryInfo.totalNodes;
            } else {
                updates.primaryNode = null;
                updates.clientInitialized = false;
                updates.totalNodes = 0;
            }
            
            this.batchUpdate(updates, { preserveUIState: true });
            
        } catch (error) {
            console.error('Failed to fetch discovery info:', error);
            this.set('error', error.message);
        }
    }

    // Select random primary node
    async selectRandomPrimaryNode() {
        try {
            const result = await window.apiClient.selectRandomPrimaryNode();
            
            if (result.success) {
                // Update the display after a short delay
                setTimeout(() => {
                    this.updatePrimaryNodeDisplay();
                }, 1500);
                
                return result;
            } else {
                throw new Error(result.message || 'Random selection failed');
            }
        } catch (error) {
            console.error('Failed to select random primary node:', error);
            throw error;
        }
    }

    // Store expanded card state
    storeExpandedCard(memberIp, content) {
        const expandedCards = this.get('expandedCards');
        expandedCards.set(memberIp, content);
        this.set('expandedCards', expandedCards);
        
        // Also store in UI state for persistence
        this.setUIState(`expanded_${memberIp}`, content);
    }

    // Get expanded card state
    getExpandedCard(memberIp) {
        const expandedCards = this.get('expandedCards');
        return expandedCards.get(memberIp);
    }

    // Clear expanded card state
    clearExpandedCard(memberIp) {
        const expandedCards = this.get('expandedCards');
        expandedCards.delete(memberIp);
        this.set('expandedCards', expandedCards);
        
        // Also clear from UI state
        this.clearUIState(`expanded_${memberIp}`);
    }

    // Store active tab for a specific node
    storeActiveTab(memberIp, tabName) {
        const activeTabs = this.get('activeTabs');
        activeTabs.set(memberIp, tabName);
        this.set('activeTabs', activeTabs);
        
        // Also store in UI state for persistence
        this.setUIState(`activeTab_${memberIp}`, tabName);
    }

    // Get active tab for a specific node
    getActiveTab(memberIp) {
        const activeTabs = this.get('activeTabs');
        return activeTabs.get(memberIp) || 'status'; // Default to 'status' tab
    }

    // Check if data has actually changed to avoid unnecessary updates
    hasDataChanged(newData, dataType) {
        const currentData = this.get(dataType);
        
        if (Array.isArray(newData) && Array.isArray(currentData)) {
            if (newData.length !== currentData.length) return true;
            
            // Compare each member's key properties
            return newData.some((newMember, index) => {
                const currentMember = currentData[index];
                return !currentMember || 
                       newMember.ip !== currentMember.ip ||
                       newMember.status !== currentMember.status ||
                       newMember.latency !== currentMember.latency;
            });
        }
        
        return newData !== currentData;
    }

    // Smart update that only updates changed data
    async smartUpdate() {
        try {
            console.log('ClusterViewModel: Performing smart update...');
            
            // Fetch new data
            const response = await window.apiClient.getClusterMembers();
            const newMembers = response.members || [];
            
            // Check if members data has actually changed
            if (this.hasDataChanged(newMembers, 'members')) {
                console.log('ClusterViewModel: Members data changed, updating...');
                await this.updateClusterMembers();
            } else {
                console.log('ClusterViewModel: Members data unchanged, skipping update');
                // Still update primary node display as it might have changed
                await this.updatePrimaryNodeDisplay();
            }
            
        } catch (error) {
            console.error('ClusterViewModel: Smart update failed:', error);
            this.set('error', error.message);
        }
    }
}

// Node Details View Model with enhanced state preservation
class NodeDetailsViewModel extends ViewModel {
    constructor() {
        super();
        this.setMultiple({
            nodeStatus: null,
            tasks: [],
            isLoading: false,
            error: null,
            activeTab: 'status',
            nodeIp: null
        });
    }

    // Load node details with state preservation
    async loadNodeDetails(ip) {
        try {
            // Store current UI state
            const currentActiveTab = this.get('activeTab');
            
            this.set('isLoading', true);
            this.set('error', null);
            this.set('nodeIp', ip);
            
            const nodeStatus = await window.apiClient.getNodeStatus(ip);
            
            // Use batch update to preserve UI state
            this.batchUpdate({
                nodeStatus: nodeStatus
            }, { preserveUIState: true });
            
            // Restore active tab
            this.set('activeTab', currentActiveTab);
            
            // Load tasks data
            await this.loadTasksData();
            
        } catch (error) {
            console.error('Failed to load node details:', error);
            this.set('error', error.message);
        } finally {
            this.set('isLoading', false);
        }
    }

    // Load tasks data with state preservation
    async loadTasksData() {
        try {
            const response = await window.apiClient.getTasksStatus();
            this.set('tasks', response || []);
        } catch (error) {
            console.error('Failed to load tasks:', error);
            this.set('tasks', []);
        }
    }

    // Set active tab with state persistence
    setActiveTab(tabName) {
        console.log('NodeDetailsViewModel: Setting activeTab to:', tabName);
        this.set('activeTab', tabName);
        
        // Store in UI state for persistence
        this.setUIState('activeTab', tabName);
    }

    // Upload firmware
    async uploadFirmware(file, nodeIp) {
        try {
            const result = await window.apiClient.uploadFirmware(file, nodeIp);
            return result;
        } catch (error) {
            console.error('Firmware upload failed:', error);
            throw error;
        }
    }
}

// Firmware View Model
class FirmwareViewModel extends ViewModel {
    constructor() {
        super();
        this.setMultiple({
            selectedFile: null,
            targetType: 'all',
            specificNode: null,
            availableNodes: [],
            uploadProgress: null,
            uploadResults: [],
            isUploading: false
        });
    }

    // Set selected file
    setSelectedFile(file) {
        this.set('selectedFile', file);
    }

    // Set target type
    setTargetType(type) {
        this.set('targetType', type);
    }

    // Set specific node
    setSpecificNode(nodeIp) {
        this.set('specificNode', nodeIp);
    }

    // Update available nodes
    updateAvailableNodes(nodes) {
        this.set('availableNodes', nodes);
    }

    // Start upload
    startUpload() {
        this.set('isUploading', true);
        this.set('uploadProgress', {
            current: 0,
            total: 0,
            status: 'Preparing...'
        });
        this.set('uploadResults', []);
    }

    // Update upload progress
    updateUploadProgress(current, total, status) {
        this.set('uploadProgress', {
            current,
            total,
            status
        });
    }

    // Add upload result
    addUploadResult(result) {
        const results = this.get('uploadResults');
        results.push(result);
        this.set('uploadResults', results);
    }

    // Complete upload
    completeUpload() {
        this.set('isUploading', false);
    }

    // Reset upload state
    resetUploadState() {
        this.set('selectedFile', null);
        this.set('uploadProgress', null);
        this.set('uploadResults', []);
        this.set('isUploading', false);
    }

    // Check if deploy button should be enabled
    isDeployEnabled() {
        const hasFile = this.get('selectedFile') !== null;
        const availableNodes = this.get('availableNodes');
        const hasAvailableNodes = availableNodes && availableNodes.length > 0;
        
        let isValidTarget = false;
        if (this.get('targetType') === 'all') {
            isValidTarget = hasAvailableNodes;
        } else if (this.get('targetType') === 'specific') {
            isValidTarget = hasAvailableNodes && this.get('specificNode');
        }
        
        return hasFile && isValidTarget && !this.get('isUploading');
    }
}

// Navigation View Model
class NavigationViewModel extends ViewModel {
    constructor() {
        super();
        this.setMultiple({
            activeView: 'cluster',
            views: ['cluster', 'firmware']
        });
    }

    // Set active view
    setActiveView(viewName) {
        this.set('activeView', viewName);
    }

    // Get active view
    getActiveView() {
        return this.get('activeView');
    }
}