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class PDFComplianceAnalyzer {
    constructor() {
        this.fileInput = document.getElementById('file-upload');
        this.loadingElement = document.getElementById('loading');
        this.resultsContainer = document.getElementById('analysis-results');
        this.reportContainer = document.getElementById('compliance-report');
        this.reportContent = document.querySelector('.report-content');
        
        this.initializeEventListeners();
    }

    initializeEventListeners() {
        this.fileInput.addEventListener('change', (e) => this.handleFileChange(e));
        this.setupDragAndDrop();
    }

    setupDragAndDrop() {
        const uploadArea = document.querySelector('.upload-area');
        
        ['dragenter', 'dragover'].forEach(eventName => {
            uploadArea.addEventListener(eventName, (e) => {
                e.preventDefault();
                uploadArea.classList.add('drag-over');
            });
        });

        ['dragleave', 'drop'].forEach(eventName => {
            uploadArea.addEventListener(eventName, (e) => {
                e.preventDefault();
                uploadArea.classList.remove('drag-over');
            });
        });

        uploadArea.addEventListener('drop', (e) => {
            const files = Array.from(e.dataTransfer.files);
            if (files.length > 0 && files[0].type === 'application/pdf') {
                this.analyzePDF(files[0]);
            } else {
                this.showError('Por favor, envie apenas arquivos PDF.');
            }
        });
    }

    handleFileChange(e) {
        const file = e.target.files[0];
        if (file && file.type === 'application/pdf') {
            this.analyzePDF(file);
        } else {
            this.showError('Por favor, selecione um arquivo PDF válido.');
        }
    }

    async analyzePDF(file) {
        this.showLoading(true);
        this.clearResults();

        try {
            // Simulação da análise do PDF
            await this.validatePDF(file);
            const report = await this.generateComplianceReport(file);
            this.displayResults(report);
        } catch (error) {
            this.showError(error.message);
        } finally {
            this.showLoading(false);
        }
    }

    async validatePDF(file) {
        return new Promise((resolve, reject) => {
            const reader = new FileReader();
            
            reader.onload = (e) => {
                const content = new Uint8Array(e.target.result);
                const header = content.slice(0, 4);
                const isPDF = String.fromCharCode(...header) === '%PDF';
                
                if (!isPDF) {
                    reject(new Error('O arquivo não é um PDF válido.'));
                }
                resolve(true);
            };

            reader.onerror = () => reject(new Error('Erro ao ler o arquivo.'));
            reader.readAsArrayBuffer(file);
        });
    }

    async generateComplianceReport(file) {
        // Simulação de análise de conformidade
        await new Promise(resolve => setTimeout(resolve, 1500));
        
        return {
            status: 'compliant',
            confidence: 92.5,
            details: {
                format: 'Válido',
                version: 'PDF 1.7',
                pages: 1,
                signature: 'Presente e válida',
                metadata: 'Completo',
                accessibility: 'Conforme'
            },
            checks: [
                { name: 'Estrutura do documento', status: 'pass', score: 100 },
                { name: 'Metadados', status: 'pass', score: 95 },
                { name: 'Assinatura digital', status: 'pass', score: 100 },
                { name: 'Acessibilidade', status: 'pass', score: 85 }
            ]
        };
    }

    displayResults(report) {
        this.reportContainer.classList.remove('hidden');
        
        const statusClass = report.status === 'compliant' ? 'alert-success' : 'alert-error';
        const statusText = report.status === 'compliant' ? 'Conforme' : 'Não conforme';
        
        this.reportContent.innerHTML = `
            <div class="alert ${statusClass}">
                <h3>Status: ${statusText}</h3>
                <p>Nível de confiança: ${report.confidence}%</p>
            </div>
            
            <div class="report-section">
                <h3>Detalhes do Documento</h3>
                ${Object.entries(report.details).map(([key, value]) => `
                    <div class="metric">
                        <span>${key}:</span>
                        <span>${value}</span>
                    </div>
                `).join('')}
            </div>
            
            <div class="report-section">
                <h3>Verificações de Conformidade</h3>
                ${report.checks.map(check => `
                    <div class="metric">
                        <span>${check.name}</span>
                        <span>${check.score}% - ${check.status === 'pass' ? 'Aprovado' : 'Reprovado'}</span>
                    </div>
                `).join('')}
            </div>
        `;
    }

    showError(message) {
        this.resultsContainer.innerHTML = `
            <div class="alert alert-error">
                <p>${message}</p>
            </div>
        `;
    }

    showLoading(show) {
        if (show) {
            this.loadingElement.classList.remove('hidden');
        } else {
            this.loadingElement.classList.add('hidden');
        }
    }

    clearResults() {
        this.resultsContainer.innerHTML = '';
        this.reportContainer.classList.add('hidden');
        this.reportContent.innerHTML = '';
    }
}

// Inicialização
document.addEventListener('DOMContentLoaded', () => {
    new PDFComplianceAnalyzer();
});