// email-modal.js — ES Module
// Modal to review and send invoice emails via AWS SES

import { showSpinner, hideSpinner } from '../utils/helpers.js';

let currentInvoice = null;
let quillInstance = null;

// ============================================================
// DOM & Render
// ============================================================

function ensureModalElement() {
    let modal = document.getElementById('email-modal');
    if (!modal) {
        modal = document.createElement('div');
        modal.id = 'email-modal';
        modal.className = 'modal fixed inset-0 bg-black bg-opacity-50 z-50 justify-center items-start pt-10 overflow-y-auto hidden';
        document.body.appendChild(modal);
    }
}

function renderModalContent() {
    const modal = document.getElementById('email-modal');
    if (!modal) return;

    const defaultEmail = currentInvoice.email || '';
    
    // Editor-Container hat jetzt eine feste, kompaktere Höhe (h-48 = 12rem/192px) und scrollt bei viel Text
    modal.innerHTML = `
        <div class="bg-white rounded-lg shadow-2xl w-full max-w-3xl mx-auto p-8">
            <div class="flex justify-between items-center mb-6">
                <h2 class="text-2xl font-bold text-gray-800">📤 Send Invoice #${currentInvoice.invoice_number || currentInvoice.id}</h2>
                <button onclick="window.emailModal.close()" class="text-gray-400 hover:text-gray-600">
                    <svg class="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                        <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M6 18L18 6M6 6l12 12" />
                    </svg>
                </button>
            </div>

            <form id="email-send-form" class="space-y-5">
                <div class="grid grid-cols-2 gap-4">
                    <div>
                        <label class="block text-sm font-medium text-gray-700 mb-1">Recipient Email *</label>
                        <input type="email" id="email-recipient" value="${defaultEmail}" required
                               class="w-full px-3 py-2 border border-gray-300 rounded-md focus:ring-blue-500 focus:border-blue-500">
                        <p class="text-xs text-gray-400 mt-1">You can override this for testing.</p>
                    </div>
                    <div>
                        <label class="block text-sm font-medium text-gray-700 mb-1">Melio Payment Link (Optional)</label>
                        <input type="url" id="email-melio-link" placeholder="https://melio.me/..."
                               class="w-full px-3 py-2 border border-gray-300 rounded-md focus:ring-blue-500 focus:border-blue-500">
                    </div>
                </div>

                <div>
                    <label class="block text-sm font-medium text-gray-700 mb-1">Message Body</label>
                    <div id="email-message-editor" class="border border-gray-300 rounded-md bg-white h-48 overflow-y-auto"></div>
                </div>

                <div class="bg-blue-50 border border-blue-200 p-4 rounded-md flex items-center gap-3">
                    <span class="text-2xl">📎</span>
                    <div class="text-sm text-blue-800">
                        <strong>Invoice_${currentInvoice.invoice_number || currentInvoice.id}.pdf</strong> will be generated and attached automatically.
                    </div>
                </div>

                <div class="flex justify-end space-x-3 pt-4">
                    <button type="button" onclick="window.emailModal.close()"
                            class="px-6 py-2 bg-gray-200 text-gray-700 rounded-md hover:bg-gray-300">Cancel</button>
                    <button type="submit" id="email-submit-btn"
                            class="px-6 py-2 bg-blue-600 text-white rounded-md hover:bg-blue-700 font-semibold">
                        Send via AWS SES
                    </button>
                </div>
            </form>
        </div>`;

    // Initialize Quill
    const editorDiv = document.getElementById('email-message-editor');
    quillInstance = new Quill(editorDiv, {
        theme: 'snow',
        modules: {
            toolbar: [
                ['bold', 'italic', 'underline'], 
                [{ 'list': 'ordered'}, { 'list': 'bullet' }], 
                ['clean']
            ]
        }
    });

    // Variablen für den Text aufbereiten
    const invoiceNum = currentInvoice.invoice_number || currentInvoice.id;
    const totalDue = parseFloat(currentInvoice.balance ?? currentInvoice.total).toFixed(2);
    
    // Datum formatieren
    let dueDateStr = 'Upon Receipt';
    if (currentInvoice.due_date) {
        const d = new Date(currentInvoice.due_date);
        dueDateStr = d.toLocaleDateString('en-US', { timeZone: 'UTC' }); 
    }
    
    // Dynamischer Text für die Fälligkeit (Löst das "payable by Upon Receipt" Problem)
    let paymentText = '';
    if (currentInvoice.terms && currentInvoice.terms.toLowerCase().includes('receipt')) {
        paymentText = 'which is due upon receipt.';
    } else if (dueDateStr !== 'Upon Receipt') {
        paymentText = `payable by <strong>${dueDateStr}</strong>.`;
    } else {
        paymentText = 'which is due upon receipt.';
    }
    
    // Der neue Standard-Text
    const defaultHtml = `
        <p>Good afternoon,</p>
        <p>Attached is invoice <strong>#${invoiceNum}</strong> for service performed at your location. The total amount due is <strong>$${totalDue}</strong>, ${paymentText}</p>
        <p>Please pay at your earliest convenience. We appreciate your continued business.</p>
        <p>If you have any questions about the invoice, feel free to reply to this email.</p>
        <p>Best regards,</p>
        <p><strong>Claudia Knuth</strong></p>
        <p>Bay Area Affiliates, Inc.</p>
        <p>accounting@bayarea-cc.com</p>
    `;
    quillInstance.root.innerHTML = defaultHtml;

    // Bind Submit Handler
    document.getElementById('email-send-form').addEventListener('submit', submitEmail);
}

// ============================================================
// Logic & API
// ============================================================

export async function openEmailModal(invoiceId) {
    ensureModalElement();
    
    if (typeof showSpinner === 'function') showSpinner('Loading invoice data...');

    try {
        const res = await fetch(`/api/invoices/${invoiceId}`);
        const data = await res.json();
        
        if (!data.invoice) throw new Error('Invoice not found');
        currentInvoice = data.invoice;

        renderModalContent();
        
        // Tailwind hidden toggle
        document.getElementById('email-modal').classList.remove('hidden');
        document.getElementById('email-modal').classList.add('flex');

    } catch (e) {
        console.error('Error loading invoice for email:', e);
        alert('Could not load invoice details.');
    } finally {
        if (typeof hideSpinner === 'function') hideSpinner();
    }
}

export function closeEmailModal() {
    const modal = document.getElementById('email-modal');
    if (modal) {
        modal.classList.add('hidden');
        modal.classList.remove('flex');
    }
    currentInvoice = null;
    quillInstance = null;
}

async function submitEmail(e) {
    e.preventDefault();

    const recipientEmail = document.getElementById('email-recipient').value.trim();
    const melioLink = document.getElementById('email-melio-link').value.trim();
    const customText = quillInstance.root.innerHTML;

    if (!recipientEmail) {
        alert('Please enter a recipient email.');
        return;
    }

    const submitBtn = document.getElementById('email-submit-btn');
    submitBtn.innerHTML = '⏳ Sending...';
    submitBtn.disabled = true;

    if (typeof showSpinner === 'function') showSpinner('Generating PDF and sending email...');

    try {
        const response = await fetch(`/api/invoices/${currentInvoice.id}/send-email`, {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({
                recipientEmail,
                melioLink,
                customText
            })
        });

        const result = await response.json();

        if (response.ok) {
            alert('✅ Invoice sent successfully!');
            closeEmailModal();
            // Reload the invoice view so the "Sent" badge updates
            if (window.invoiceView) window.invoiceView.loadInvoices();
        } else {
            alert(`❌ Error: ${result.error}`);
        }
    } catch (e) {
        console.error('Send email error:', e);
        alert('Network error while sending email.');
    } finally {
        submitBtn.innerHTML = 'Send via AWS SES';
        submitBtn.disabled = false;
        if (typeof hideSpinner === 'function') hideSpinner();
    }
}

// ============================================================
// Expose
// ============================================================
window.emailModal = {
    open: openEmailModal,
    close: closeEmailModal
};