// DNS Reconnaissance Tool - Frontend JavaScript

class ReconTool {
    constructor() {
        this.currentScanId = null;
        this.pollInterval = null;
        this.currentReport = null;
        this.init();
    }

    init() {
        this.bindEvents();
    }

    bindEvents() {
        // Start scan button
        document.getElementById('startScan').addEventListener('click', () => {
            this.startScan();
        });

        // New scan button
        document.getElementById('newScan').addEventListener('click', () => {
            this.resetToForm();
        });

        // Report view toggles
        document.getElementById('showJson').addEventListener('click', () => {
            this.showReport('json');
        });

        document.getElementById('showText').addEventListener('click', () => {
            this.showReport('text');
        });

        // Download buttons
        document.getElementById('downloadJson').addEventListener('click', () => {
            this.downloadReport('json');
        });

        document.getElementById('downloadText').addEventListener('click', () => {
            this.downloadReport('text');
        });

        // Enter key in target field
        document.getElementById('target').addEventListener('keypress', (e) => {
            if (e.key === 'Enter') {
                this.startScan();
            }
        });
    }

    async startScan() {
        const target = document.getElementById('target').value.trim();
        
        if (!target) {
            alert('Please enter a target domain or hostname');
            return;
        }

        const scanData = {
            target: target,
            max_depth: parseInt(document.getElementById('maxDepth').value),
            shodan_key: document.getElementById('shodanKey').value.trim() || null,
            virustotal_key: document.getElementById('virustotalKey').value.trim() || null
        };

        try {
            // Show progress section
            this.showProgressSection();
            this.updateProgress(0, 'Starting scan...');

            const response = await fetch('/api/scan', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify(scanData)
            });

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

            const result = await response.json();
            
            if (result.error) {
                throw new Error(result.error);
            }

            this.currentScanId = result.scan_id;
            this.startPolling();

        } catch (error) {
            this.showError(`Failed to start scan: ${error.message}`);
        }
    }

    startPolling() {
        // Poll every 2 seconds for updates
        this.pollInterval = setInterval(() => {
            this.checkScanStatus();
        }, 2000);
        
        // Also check immediately
        this.checkScanStatus();
    }

    async checkScanStatus() {
        if (!this.currentScanId) {
            return;
        }

        try {
            const response = await fetch(`/api/scan/${this.currentScanId}/status`);
            
            if (!response.ok) {
                throw new Error(`HTTP error! status: ${response.status}`);
            }

            const status = await response.json();
            
            if (status.error) {
                throw new Error(status.error);
            }

            // Update progress
            this.updateProgress(status.progress, status.message);

            // Check if completed
            if (status.status === 'completed') {
                this.stopPolling();
                await this.loadScanReport();
            } else if (status.status === 'error') {
                this.stopPolling();
                throw new Error(status.error || 'Scan failed');
            }

        } catch (error) {
            this.stopPolling();
            this.showError(`Error checking scan status: ${error.message}`);
        }
    }

    async loadScanReport() {
        try {
            const response = await fetch(`/api/scan/${this.currentScanId}/report`);
            
            if (!response.ok) {
                throw new Error(`HTTP error! status: ${response.status}`);
            }

            const report = await response.json();
            
            if (report.error) {
                throw new Error(report.error);
            }

            this.currentReport = report;
            this.showResultsSection();
            this.showReport('text'); // Default to text view

        } catch (error) {
            this.showError(`Error loading report: ${error.message}`);
        }
    }

    stopPolling() {
        if (this.pollInterval) {
            clearInterval(this.pollInterval);
            this.pollInterval = null;
        }
    }

    showProgressSection() {
        document.getElementById('scanForm').style.display = 'none';
        document.getElementById('progressSection').style.display = 'block';
        document.getElementById('resultsSection').style.display = 'none';
    }

    showResultsSection() {
        document.getElementById('scanForm').style.display = 'none';
        document.getElementById('progressSection').style.display = 'none';
        document.getElementById('resultsSection').style.display = 'block';
    }

    resetToForm() {
        this.stopPolling();
        this.currentScanId = null;
        this.currentReport = null;
        
        document.getElementById('scanForm').style.display = 'block';
        document.getElementById('progressSection').style.display = 'none';
        document.getElementById('resultsSection').style.display = 'none';
        
        // Clear form
        document.getElementById('target').value = '';
        document.getElementById('shodanKey').value = '';
        document.getElementById('virustotalKey').value = '';
        document.getElementById('maxDepth').value = '2';
    }

    updateProgress(percentage, message) {
        const progressFill = document.getElementById('progressFill');
        const progressMessage = document.getElementById('progressMessage');
        
        progressFill.style.width = `${percentage || 0}%`;
        progressMessage.textContent = message || 'Processing...';
    }

    showError(message) {
        // Update progress section to show error
        this.updateProgress(0, `Error: ${message}`);
        
        // Also alert the user
        alert(`Error: ${message}`);
    }

    showReport(type) {
        if (!this.currentReport) {
            return;
        }

        const reportContent = document.getElementById('reportContent');
        const showJsonBtn = document.getElementById('showJson');
        const showTextBtn = document.getElementById('showText');

        if (type === 'json') {
            // Show JSON report
            try {
                const jsonData = JSON.parse(this.currentReport.json_report);
                reportContent.textContent = JSON.stringify(jsonData, null, 2);
            } catch (e) {
                reportContent.textContent = this.currentReport.json_report;
            }
            
            showJsonBtn.classList.add('active');
            showTextBtn.classList.remove('active');
        } else {
            // Show text report
            reportContent.textContent = this.currentReport.text_report;
            
            showTextBtn.classList.add('active');
            showJsonBtn.classList.remove('active');
        }
    }

    downloadReport(type) {
        if (!this.currentReport) {
            return;
        }

        let content, filename, mimeType;

        if (type === 'json') {
            content = this.currentReport.json_report;
            filename = `recon-report-${this.currentScanId}.json`;
            mimeType = 'application/json';
        } else {
            content = this.currentReport.text_report;
            filename = `recon-report-${this.currentScanId}.txt`;
            mimeType = 'text/plain';
        }

        // Create download link
        const blob = new Blob([content], { type: mimeType });
        const url = window.URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = filename;
        document.body.appendChild(a);
        a.click();
        window.URL.revokeObjectURL(url);
        document.body.removeChild(a);
    }
}

// Initialize the application when DOM is loaded
document.addEventListener('DOMContentLoaded', () => {
    new ReconTool();
});