const dropArea = document.getElementById('dropArea');
const fileInput = document.getElementById('fileInput');
const fileList = document.getElementById('fileList');
const submitBtn = document.getElementById('submitBtn');
const emailInput = document.getElementById('emailInput');
const notesInput = document.getElementById('notesInput');
let selectedFiles = [];

function checkCanSubmit() {
    const hasEmail = emailInput.value.trim().length > 0;
    const hasNotes = notesInput.value.trim().length > 0;
    const hasFiles = selectedFiles.length > 0;
    submitBtn.disabled = !(hasEmail || hasNotes || hasFiles);
}

emailInput.addEventListener('input', checkCanSubmit);
notesInput.addEventListener('input', checkCanSubmit);

dropArea.addEventListener('click', () => fileInput.click());

dropArea.addEventListener('dragover', (e) => {
    e.preventDefault();
    dropArea.classList.add('dragover');
});

dropArea.addEventListener('dragleave', () => {
    dropArea.classList.remove('dragover');
});

dropArea.addEventListener('drop', (e) => {
    e.preventDefault();
    dropArea.classList.remove('dragover');
    handleFiles(e.dataTransfer.files);
});

fileInput.addEventListener('change', (e) => {
    handleFiles(e.target.files);
});

function handleFiles(files) {
    selectedFiles = Array.from(files);
    displayFiles();
    checkCanSubmit();
}

function displayFiles() {
    if (selectedFiles.length === 0) {
        fileList.classList.remove('show');
        return;
    }
    fileList.classList.add('show');
    fileList.innerHTML = selectedFiles.map(file =>
        `<div class="file-item">${file.name} (${(file.size / 1024).toFixed(1)} KB)</div>`
    ).join('');
}

submitBtn.addEventListener('click', async () => {
    const email = emailInput.value.trim();
    const notes = notesInput.value.trim();

    // Validate at least one field
    if (!email && !notes && selectedFiles.length === 0) {
        return;
    }

    // Disable form during submission
    submitBtn.disabled = true;
    emailInput.disabled = true;
    notesInput.disabled = true;
    fileInput.disabled = true;
    dropArea.style.pointerEvents = 'none';
    dropArea.classList.add('disabled');

    // Show progress bar
    const progressContainer = document.getElementById('progressContainer');
    const progressFill = document.getElementById('progressFill');
    const progressMessage = document.getElementById('progressMessage');
    progressContainer.style.display = 'block';
    progressFill.style.width = '0%';
    progressMessage.textContent = 'Starting...';
    
    // Scroll to progress bar so it's visible (for Google Pages iframe compatibility)
    setTimeout(() => {
        progressContainer.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
    }, 100);

    try {
        // Create FormData
        const formData = new FormData();
        if (email) formData.append('email', email);
        if (notes) formData.append('notes', notes);
        selectedFiles.forEach(file => {
            formData.append('files', file);
        });

        // Submit and read streaming response
        const response = await fetch('/submit-quote/', {
            method: 'POST',
            body: formData
        });

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

        const reader = response.body.getReader();
        const decoder = new TextDecoder();
        let buffer = '';

        while (true) {
            const { done, value } = await reader.read();
            if (done) break;

            buffer += decoder.decode(value, { stream: true });
            const lines = buffer.split('\n');
            buffer = lines.pop() || ''; // Keep incomplete line in buffer

            for (const line of lines) {
                if (line.trim()) {
                    try {
                        const update = JSON.parse(line);
                        progressFill.style.width = update.progress + '%';
                        progressMessage.textContent = update.message;

                        if (update.step === 5 || update.step === 'error') {
                            // Complete or error
                            if (update.step === 5) {
                                setTimeout(() => {
                                    // Reset form after success
                                    emailInput.value = '';
                                    notesInput.value = '';
                                    selectedFiles = [];
                                    displayFiles();
                                    checkCanSubmit();

                                    // Re-enable form (but keep progress bar visible)
                                    emailInput.disabled = false;
                                    notesInput.disabled = false;
                                    fileInput.disabled = false;
                                    dropArea.style.pointerEvents = 'auto';
                                    dropArea.classList.remove('disabled');
                                }, 2000);
                            } else {
                                // Error - re-enable form
                                emailInput.disabled = false;
                                notesInput.disabled = false;
                                fileInput.disabled = false;
                                dropArea.style.pointerEvents = 'auto';
                                dropArea.classList.remove('disabled');
                                submitBtn.disabled = false;
                            }
                        }
                    } catch (e) {
                        console.error('Error parsing progress update:', e);
                    }
                }
            }
        }
    } catch (error) {
        progressMessage.textContent = `Error: ${error.message}`;
        progressFill.style.width = '0%';

        // Re-enable form
        emailInput.disabled = false;
        notesInput.disabled = false;
        fileInput.disabled = false;
        dropArea.style.pointerEvents = 'auto';
        dropArea.classList.remove('disabled');
        submitBtn.disabled = false;
    }
});

// Attempt to auto-resize the iframe height (if parent allows)
function postHeight() {
    const height = document.documentElement.scrollHeight;
    try {
        parent.postMessage({ type: 'sedutto-ifr-height', height }, '*');
    } catch (e) {
        // ignore if cross-origin restrictions apply
    }
}
window.addEventListener('load', postHeight);
window.addEventListener('resize', postHeight);
const mo = new MutationObserver(postHeight);
mo.observe(document.body, { childList: true, subtree: true });