let feedData = [];

async function loadBudget() {
    const msg = document.getElementById('msg');
    try {
        const [stats, purchases] = await Promise.all([
            API.get('/api/stats/budget'),
            API.get('/api/feed'),
        ]);

        // All-time stats
        document.getElementById('b-cost-total').textContent = fmtMoney(stats.total_feed_cost);
        document.getElementById('b-eggs-total').textContent = stats.total_eggs_alltime;
        document.getElementById('b-cpe').textContent        = fmtMoneyFull(stats.cost_per_egg);
        document.getElementById('b-cpd').textContent        = fmtMoney(stats.cost_per_dozen);

        // Last 30 days
        document.getElementById('b-cost-30d').textContent = fmtMoney(stats.total_feed_cost_30d);
        document.getElementById('b-eggs-30d').textContent = stats.total_eggs_30d;
        document.getElementById('b-cpe-30d').textContent  = fmtMoneyFull(stats.cost_per_egg_30d);
        document.getElementById('b-cpd-30d').textContent  = fmtMoney(stats.cost_per_dozen_30d);

        feedData = purchases;
        renderTable();
    } catch (err) {
        showMessage(msg, `Failed to load budget data: ${err.message}`, 'error');
    }
}

function renderTable() {
    const tbody = document.getElementById('feed-body');
    const tfoot = document.getElementById('feed-foot');

    if (feedData.length === 0) {
        tbody.innerHTML = '<tr class="empty-row"><td colspan="6">No feed purchases logged yet.</td></tr>';
        tfoot.innerHTML = '';
        return;
    }

    tbody.innerHTML = feedData.map(e => {
        const total = (parseFloat(e.bags) * parseFloat(e.price_per_bag)).toFixed(2);
        return `
            <tr data-id="${e.id}">
                <td>${fmtDate(e.date)}</td>
                <td>${parseFloat(e.bags)}</td>
                <td>${fmtMoney(e.price_per_bag)}</td>
                <td>${fmtMoney(total)}</td>
                <td class="notes">${e.notes || ''}</td>
                <td class="actions">
                    <button class="btn btn-ghost btn-sm" onclick="startEdit(${e.id})">Edit</button>
                    <button class="btn btn-danger btn-sm" onclick="deleteEntry(${e.id})">Delete</button>
                </td>
            </tr>
        `;
    }).join('');

    // Total row
    const grandTotal = feedData.reduce((sum, e) => sum + parseFloat(e.bags) * parseFloat(e.price_per_bag), 0);
    tfoot.innerHTML = `
        <tr class="total-row">
            <td colspan="3">Total</td>
            <td>${fmtMoney(grandTotal)}</td>
            <td colspan="2">${feedData.length} purchases</td>
        </tr>
    `;
}

function startEdit(id) {
    const entry = feedData.find(e => e.id === id);
    const row   = document.querySelector(`tr[data-id="${id}"]`);

    row.innerHTML = `
        <td><input type="date" value="${entry.date}"></td>
        <td><input type="number" min="0.01" step="0.01" value="${parseFloat(entry.bags)}" style="width:80px;"></td>
        <td><input type="number" min="0.01" step="0.01" value="${parseFloat(entry.price_per_bag)}" style="width:90px;"></td>
        <td>—</td>
        <td><input type="text" value="${entry.notes || ''}" placeholder="Notes"></td>
        <td class="actions">
            <button class="btn btn-primary btn-sm" onclick="saveEdit(${id})">Save</button>
            <button class="btn btn-ghost btn-sm"   onclick="renderTable()">Cancel</button>
        </td>
    `;
}

async function saveEdit(id) {
    const msg = document.getElementById('msg');
    const row = document.querySelector(`tr[data-id="${id}"]`);
    const inputs = row.querySelectorAll('input');
    const [dateInput, bagsInput, priceInput, notesInput] = inputs;

    try {
        const updated = await API.put(`/api/feed/${id}`, {
            date:          dateInput.value,
            bags:          parseFloat(bagsInput.value),
            price_per_bag: parseFloat(priceInput.value),
            notes:         notesInput.value.trim() || null,
        });
        const idx = feedData.findIndex(e => e.id === id);
        feedData[idx] = updated;
        renderTable();
        loadBudget();
        showMessage(msg, 'Purchase updated.');
    } catch (err) {
        showMessage(msg, `Error: ${err.message}`, 'error');
    }
}

async function deleteEntry(id) {
    if (!confirm('Delete this purchase?')) return;
    const msg = document.getElementById('msg');
    try {
        await API.del(`/api/feed/${id}`);
        feedData = feedData.filter(e => e.id !== id);
        renderTable();
        loadBudget();
        showMessage(msg, 'Purchase deleted.');
    } catch (err) {
        showMessage(msg, `Error: ${err.message}`, 'error');
    }
}

document.addEventListener('DOMContentLoaded', () => {
    const form       = document.getElementById('feed-form');
    const msg        = document.getElementById('msg');
    const bagsInput  = document.getElementById('bags');
    const priceInput = document.getElementById('price');
    const totalDisplay = document.getElementById('total-display');

    setToday(document.getElementById('date'));

    // Live total calculation
    function updateTotal() {
        const bags  = parseFloat(bagsInput.value)  || 0;
        const price = parseFloat(priceInput.value) || 0;
        totalDisplay.value = bags && price ? fmtMoney(bags * price) : '';
    }
    bagsInput.addEventListener('input', updateTotal);
    priceInput.addEventListener('input', updateTotal);

    form.addEventListener('submit', async (e) => {
        e.preventDefault();

        const data = {
            date:          document.getElementById('date').value,
            bags:          parseFloat(bagsInput.value),
            price_per_bag: parseFloat(priceInput.value),
            notes:         document.getElementById('notes').value.trim() || null,
        };

        try {
            await API.post('/api/feed', data);
            showMessage(msg, 'Purchase saved!');
            form.reset();
            totalDisplay.value = '';
            setToday(document.getElementById('date'));
            loadBudget();
        } catch (err) {
            showMessage(msg, `Error: ${err.message}`, 'error');
        }
    });

    loadBudget();
});