// Email Composer Module
class EmailComposer {
    constructor() {
        this.modal = document.getElementById('email-modal');
        this.form = document.getElementById('email-form');
        this.closeBtn = document.getElementById('close-modal');
        this.cancelBtn = document.getElementById('cancel-email');
        this.messageTextarea = document.getElementById('email-message');
        this.charCounter = document.querySelector('.char-counter');
        
        this.currentRecipient = null;
        this.init();
    }

    init() {
        // Modal controls
        this.closeBtn.addEventListener('click', () => this.closeModal());
        this.cancelBtn.addEventListener('click', () => this.closeModal());
        this.modal.addEventListener('click', (e) => {
            if (e.target === this.modal) this.closeModal();
        });

        // Form handling
        this.form.addEventListener('submit', (e) => this.handleSubmit(e));
        
        // Character counter
        this.messageTextarea.addEventListener('input', () => this.updateCharCounter());
        
        // Escape key to close modal
        document.addEventListener('keydown', (e) => {
            if (e.key === 'Escape' && this.modal.style.display === 'block') {
                this.closeModal();
            }
        });
    }

    openModal(recipient) {
        this.currentRecipient = recipient;
        
        // Populate recipient info
        document.getElementById('recipient-email').value = recipient.email;
        document.getElementById('recipient-info').innerHTML = `
            <strong>${recipient.name}</strong><br>
            ${recipient.office}<br>
            ${recipient.district}<br>
            <em>${recipient.email}</em>
        `;
        
        // Set postal code from current lookup
        const postalCode = window.postalLookup ? window.postalLookup.currentPostalCode : '';
        document.getElementById('sender-postal-code').value = postalCode;
        
        // Clear form fields
        document.getElementById('sender-name').value = '';
        document.getElementById('sender-email').value = '';
        document.getElementById('email-subject').value = '';
        document.getElementById('email-message').value = '';
        
        // Set default subject
        document.getElementById('email-subject').value = `Message from your constituent in ${postalCode}`;
        
        this.updateCharCounter();
        this.modal.style.display = 'block';
        
        // Focus on first input
        document.getElementById('sender-name').focus();
    }

    closeModal() {
        this.modal.style.display = 'none';
        this.currentRecipient = null;
    }

    updateCharCounter() {
        const maxLength = 5000;
        const currentLength = this.messageTextarea.value.length;
        const remaining = maxLength - currentLength;
        
        this.charCounter.textContent = `${remaining} characters remaining`;
        
        if (remaining < 100) {
            this.charCounter.style.color = '#dc3545'; // Red
        } else if (remaining < 500) {
            this.charCounter.style.color = '#ffc107'; // Yellow
        } else {
            this.charCounter.style.color = '#666'; // Default
        }
    }

    validateForm() {
        const errors = [];
        
        const senderName = document.getElementById('sender-name').value.trim();
        const senderEmail = document.getElementById('sender-email').value.trim();
        const subject = document.getElementById('email-subject').value.trim();
        const message = document.getElementById('email-message').value.trim();
        
        if (!senderName) {
            errors.push('Your name is required');
        }
        
        if (!senderEmail) {
            errors.push('Your email is required');
        } else if (!this.validateEmail(senderEmail)) {
            errors.push('Please enter a valid email address');
        }
        
        if (!subject) {
            errors.push('Subject is required');
        }
        
        if (!message) {
            errors.push('Message is required');
        } else if (message.length < 10) {
            errors.push('Message must be at least 10 characters long');
        }
        
        // Check for suspicious content
        if (this.containsSuspiciousContent(message) || this.containsSuspiciousContent(subject)) {
            errors.push('Your message contains content that may not be appropriate');
        }
        
        return errors;
    }

    validateEmail(email) {
        const regex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
        return regex.test(email);
    }

    containsSuspiciousContent(text) {
        const suspiciousPatterns = [
            /<script/i,
            /javascript:/i,
            /on\w+\s*=/i,
            /<iframe/i,
            /<object/i,
            /<embed/i
        ];
        
        return suspiciousPatterns.some(pattern => pattern.test(text));
    }

    async handleSubmit(e) {
        e.preventDefault();
        
        const errors = this.validateForm();
        if (errors.length > 0) {
            window.messageDisplay.show(errors.join('<br>'), 'error');
            return;
        }

        const submitButton = this.form.querySelector('button[type="submit"]');
        const originalText = submitButton.textContent;
        
        try {
            submitButton.disabled = true;
            submitButton.textContent = 'Sending...';
            
            const emailData = {
                recipientEmail: document.getElementById('recipient-email').value,
                senderName: document.getElementById('sender-name').value.trim(),
                senderEmail: document.getElementById('sender-email').value.trim(),
                subject: document.getElementById('email-subject').value.trim(),
                message: document.getElementById('email-message').value.trim(),
                postalCode: document.getElementById('sender-postal-code').value
            };

            const result = await window.apiClient.sendEmail(emailData);
            
            if (result.success) {
                window.messageDisplay.show('Email sent successfully! Your representative will receive your message.', 'success');
                this.closeModal();
            } else {
                throw new Error(result.message || 'Failed to send email');
            }
            
        } catch (error) {
            console.error('Email send failed:', error);
            
            // Handle rate limit errors specifically
            if (error.status === 429 && error.data && error.data.rateLimitType === 'per-recipient') {
                const retryMinutes = Math.ceil((error.data.retryAfter || 300) / 60);
                window.messageDisplay.show(
                    `Rate limit reached: You can only send one email per representative every 5 minutes. Please wait ${retryMinutes} more minutes before sending another email to this representative. You can still send emails to other representatives.`, 
                    'warning'
                );
            } else if (error.status === 429) {
                // General rate limit
                window.messageDisplay.show(
                    `Too many emails sent. Please wait before sending more emails.`, 
                    'warning'
                );
            } else {
                window.messageDisplay.show(`Failed to send email: ${error.message}`, 'error');
            }
        } finally {
            submitButton.disabled = false;
            submitButton.textContent = originalText;
        }
    }

    // Helper method to get template messages
    getTemplateMessage(type) {
        const templates = {
            general: `Dear {{name}},

I am writing as your constituent from {{postalCode}} to express my views on an important matter.

[Please write your message here]

I would appreciate your response on this issue and would like to know your position.

Thank you for your time and service to our community.

Sincerely,
{{senderName}}`,
            
            concern: `Dear {{name}},

I am writing to express my concern about [specific issue] as your constituent from {{postalCode}}.

[Describe your concern and its impact]

I urge you to [specific action you want them to take].

Thank you for considering my views on this important matter.

Best regards,
{{senderName}}`,
            
            support: `Dear {{name}},

I am writing to express my support for [specific issue/bill/policy] as your constituent from {{postalCode}}.

[Explain why you support this and its importance]

I encourage you to continue supporting this initiative.

Thank you for your leadership on this matter.

Respectfully,
{{senderName}}`
        };
        
        return templates[type] || templates.general;
    }
}

// Initialize when DOM is loaded
document.addEventListener('DOMContentLoaded', () => {
    window.emailComposer = new EmailComposer();
});