/**
 * Client-Side JavaScript for the International Umbrella Endowment
 *
 * Handles all user interactions:
 * - Opening the submission modal via a floating button.
 * - Submitting a new deal and auto-populating the lookup field.
 * - Looking up a deal's status and displaying it in a modal.
 * - Admin actions for approving/declining deals.
 *
 * Final Version: Monday, June 16, 2025
 */
document.addEventListener('DOMContentLoaded', () => {
    
    // --- CONFIGURATION ---
    const workerUrl = 'https://form-handler-worker.aiagents.workers.dev/'; // Ensure this is your correct worker URL

    // --- ELEMENT SELECTIONS ---
    // Forms
    const submissionForm = document.getElementById('vessel-exchange-form');
    const lookupForm = document.getElementById('deal-lookup-form');
    const adminForm = document.getElementById('admin-action-form');
    
    // Buttons
    const showSubmissionButton = document.getElementById('show-submission-button');
    const submitButton = document.getElementById('submit-button');
    const adminApproveButton = document.getElementById('admin-approve-button');
    const adminDeclineButton = document.getElementById('admin-decline-button');
    const submissionModalCloseButton = document.getElementById('submission-modal-close-button');
    const dealModalCloseButton = document.getElementById('modal-close-button');

    // Modals & Containers
    const submissionModal = document.getElementById('submission-modal');
    const dealModal = document.getElementById('deal-modal');
    const lookupContainer = document.getElementById('lookup-container');
    const lookupInput = document.getElementById('lookup-deal-id');
    
    // Status Message Areas
    const submissionStatus = document.getElementById('status-message');
    const adminStatus = document.getElementById('admin-status-message');

    
    // --- EVENT LISTENERS ---

    // Floating button to show the submission form modal
    if (showSubmissionButton) {
        showSubmissionButton.addEventListener('click', () => {
            submissionModal.classList.remove('hidden');
        });
    }
    
    // Close the submission form modal
    if (submissionModal) {
        submissionModalCloseButton.addEventListener('click', () => closeModal(submissionModal));
        submissionModal.addEventListener('click', (event) => {
            if (event.target === submissionModal) closeModal(submissionModal);
        });
    }

    // Close the deal info modal
    if (dealModal) {
        dealModalCloseButton.addEventListener('click', () => closeModal(dealModal));
        dealModal.addEventListener('click', (event) => {
            if (event.target === dealModal) closeModal(dealModal);
        });
    }

    // Handle New Deal Submissions
    if (submissionForm) {
        submissionForm.addEventListener('submit', handleFormSubmit);
    }

    // Handle Deal Status Lookups
    if (lookupForm) {
        lookupForm.addEventListener('submit', handleLookupSubmit);
    }

    // Handle Admin Actions
    if (adminForm) {
        adminApproveButton.addEventListener('click', () => handleAdminClick('approve'));
        adminDeclineButton.addEventListener('click', () => handleAdminClick('decline'));
    }

    
    // --- HANDLER FUNCTIONS ---

    /**
     * Handles the main form submission to create a new deal.
     */
    async function handleFormSubmit(event) {
        event.preventDefault(); // Stop page reload
        
        showStatus(submissionStatus, 'Submitting...');
        submitButton.disabled = true;
        
        try {
            const formData = new FormData(submissionForm);
            const response = await fetch(workerUrl, { method: 'POST', body: formData });
            const resultText = await response.text();

            if (!response.ok) {
                throw new Error(resultText); // Use the error text from the worker
            }
            
            const result = JSON.parse(resultText);
            const dealId = result.deal_id;
            
            // --- Auto-populate and Highlight Logic ---
            showSuccess(submissionStatus, `Success! Deal ID copied below.`);
            lookupInput.value = dealId; // Auto-populate the lookup field
            
            lookupContainer.classList.add('highlight');
            setTimeout(() => {
                lookupContainer.classList.remove('highlight');
            }, 2000);

            submissionForm.reset();
            
            // Close the modal after a delay
            setTimeout(() => closeModal(submissionModal), 2500);

        } catch (error) {
            showError(submissionStatus, error.message);
        } finally {
            submitButton.disabled = false;
        }
    }

    /**
     * Handles the lookup form submission to check a deal's status.
     */
    async function handleLookupSubmit(event) {
        event.preventDefault();
        if (!lookupInput.value) return;

        try {
            const response = await fetch(`${workerUrl}?deal_id=${lookupInput.value}`, { method: 'GET' });
            const result = await response.json();
            if (!response.ok) throw new Error(result.error || 'Failed to fetch deal.');
            
            openDealInfoModal(result);
        } catch (error) {
            alert(`Error: ${error.message}`);
        }
    }

    /**
     * Handles clicks on the admin approve/decline buttons.
     */
    async function handleAdminClick(action) {
        const dealId = document.getElementById('admin-deal-id').value;
        if (!dealId) {
            showError(adminStatus, 'Please enter a Deal ID.');
            return;
        }

        showStatus(adminStatus, 'Processing action...');
        const formData = new FormData();
        formData.append('action', action);
        formData.append('deal_id', dealId);

        try {
            const response = await fetch(workerUrl, { method: 'POST', body: formData });
            const result = await response.json();
            if (!response.ok) throw new Error(result.error || `Server responded with status ${response.status}`);

            showSuccess(adminStatus, result.message);
        } catch (error) {
            showError(adminStatus, error.message);
        }
    }

    
    // --- UI HELPER FUNCTIONS ---

    /**
     * Populates and opens the deal information modal.
     */
    function openDealInfoModal(dealData) {
        document.getElementById('modal-deal-id').textContent = dealData.deal_id;
        document.getElementById('modal-owner-name').textContent = dealData.owner_name;
        document.getElementById('modal-contact-email').textContent = dealData.contact_email;
        document.getElementById('modal-contact-phone').textContent = dealData.contact_phone || 'N/A';
        document.getElementById('modal-year-built').textContent = dealData.year_built || 'N/A';
        document.getElementById('modal-gross-tonnage').textContent = dealData.gross_tonnage || 'N/A';
        document.getElementById('modal-token-amount').textContent = dealData.token_amount;
        document.getElementById('modal-vessel-description').textContent = dealData.vessel_description || 'No description provided.';
        
        const statusBadge = document.getElementById('modal-status-badge');
        statusBadge.textContent = dealData.status;
        statusBadge.className = `badge ${dealData.status}`;
        
        dealModal.classList.remove('hidden');
    }

    /**
     * Hides a modal element.
     */
    function closeModal(modalElement) {
        modalElement.classList.add('hidden');
    }
    
    /**
     * Displays a generic status message.
     */
    function showStatus(element, message) {
        element.className = 'status';
        element.innerHTML = message;
        element.style.display = 'block';
    }

    /**
     * Displays a success message.
     */
    function showSuccess(element, message) {
        element.className = 'status success';
        element.innerHTML = `<strong>${message}</strong>`;
        element.style.display = 'block';
    }

    /**
     * Displays an error message.
     */
    function showError(element, message) {
        element.className = 'status error';
        element.innerHTML = `<strong>Error:</strong> ${message}`;
        element.style.display = 'block';
    }
});