/**
 * Steuerkram – App JavaScript
 * Kein Framework. Nur native DOM-APIs.
 */

'use strict';

// ── Kontenart-Badge neben Label anzeigen ─────────────────────
function showKontoArt(selectId, badgeId, sel) {
    const badge = document.getElementById(badgeId);
    if (!badge) return;
    const opt = sel.options[sel.selectedIndex];
    const art = opt?.dataset?.art || '';
    const classes = {
        'Aufwand': 'badge-red',
        'Ertrag':  'badge-green',
        'Aktiv':   'badge-blue',
        'Passiv':  'badge-yellow',
        'Neutral': 'badge-gray',
    };
    badge.textContent = art;
    badge.className = 'badge ' + (classes[art] || 'badge-gray');
    badge.style.display = art ? '' : 'none';
}

// ── Konto-Filter (Select-Filterung per Sucheingabe) ───────────
document.addEventListener('input', (e) => {
    if (!e.target.classList.contains('konto-filter')) return;
    const q      = e.target.value.toLowerCase();
    const select = document.getElementById(e.target.dataset.target);
    if (!select) return;
    for (const opt of select.options) {
        if (opt.value === '') { opt.hidden = false; continue; }
        opt.hidden = !opt.dataset.search.toLowerCase().includes(q);
    }
    // Auto-select nur bei exaktem Kontonummer-Treffer; sonst Select leeren
    // (verhindert, dass direkte Kontonummer-Eingabe durch einen Partial-Match überschrieben wird)
    if (q.length > 0) {
        const exact = [...select.options].find(
            opt => opt.value !== '' && opt.dataset.search && opt.dataset.search.split(' ')[0] === q
        );
        select.value = exact ? exact.value : '';
        select.dispatchEvent(new Event('change'));
    }
});

// ── Modals ────────────────────────────────────────────────────
document.addEventListener('click', (e) => {
    // Open modal
    const openBtn = e.target.closest('[data-modal-open]');
    if (openBtn) {
        const id = openBtn.dataset.modalOpen;
        document.getElementById(id)?.classList.add('open');
        return;
    }

    // Close modal via backdrop click or close button
    const closeBtn = e.target.closest('[data-modal-close]');
    if (closeBtn) {
        closeBtn.closest('.modal-overlay')?.classList.remove('open');
        return;
    }

    if (e.target.classList.contains('modal-overlay')) {
        e.target.classList.remove('open');
    }
});

// Close modal on Escape key
document.addEventListener('keydown', (e) => {
    if (e.key === 'Escape') {
        document.querySelectorAll('.modal-overlay.open').forEach(m => m.classList.remove('open'));
    }
});

// ── Confirm Delete ────────────────────────────────────────────
document.addEventListener('submit', (e) => {
    const form = e.target;
    const msg = form.dataset.confirm;
    if (msg && !confirm(msg)) {
        e.preventDefault();
    }
});

// ── Rechnungszeilen – Live-Kalkulation ────────────────────────
function calcInvoiceLine(row) {
    const menge      = parseFloat(row.querySelector('[name$="[menge]"]')?.value) || 0;
    const preis      = parseFloat(row.querySelector('[name$="[einzelpreis]"]')?.value) || 0;
    const ustSatz    = parseFloat(row.querySelector('[name$="[ust_satz]"]')?.value) || 0;

    const netto  = menge * preis;
    const ust    = netto * ustSatz / 100;
    const brutto = netto + ust;

    const fmt = (v) => v.toLocaleString('de-DE', { minimumFractionDigits: 2, maximumFractionDigits: 2 });

    const nettoEl  = row.querySelector('.line-netto');
    const bruttoEl = row.querySelector('.line-brutto');
    if (nettoEl)  nettoEl.textContent  = fmt(netto)  + ' €';
    if (bruttoEl) bruttoEl.textContent = fmt(brutto) + ' €';
}

function calcInvoiceTotals() {
    let totalNetto  = 0;
    let totalUst    = 0;
    let totalBrutto = 0;

    document.querySelectorAll('.invoice-line-row').forEach(row => {
        const menge   = parseFloat(row.querySelector('[name$="[menge]"]')?.value) || 0;
        const preis   = parseFloat(row.querySelector('[name$="[einzelpreis]"]')?.value) || 0;
        const ustSatz = parseFloat(row.querySelector('[name$="[ust_satz]"]')?.value) || 0;
        const netto   = menge * preis;
        const ust     = netto * ustSatz / 100;
        totalNetto  += netto;
        totalUst    += ust;
        totalBrutto += netto + ust;
        calcInvoiceLine(row);
    });

    const fmt = (v) => v.toLocaleString('de-DE', { minimumFractionDigits: 2, maximumFractionDigits: 2 }) + ' €';

    const elNetto  = document.getElementById('total-netto');
    const elUst    = document.getElementById('total-ust');
    const elBrutto = document.getElementById('total-brutto');
    if (elNetto)  elNetto.textContent  = fmt(totalNetto);
    if (elUst)    elUst.textContent    = fmt(totalUst);
    if (elBrutto) elBrutto.textContent = fmt(totalBrutto);
}

// Live-Update on input change in invoice form
document.addEventListener('input', (e) => {
    if (e.target.closest('.invoice-line-row')) {
        calcInvoiceTotals();
    }
    if (e.target.closest('.invoice-line-row') && e.target.matches('[name$="[ust_satz]"]')) {
        calcInvoiceTotals();
    }
});

// ── Rechnungszeile hinzufügen ─────────────────────────────────
let lineCounter = 0;

function addInvoiceLine() {
    lineCounter++;
    const tbody = document.getElementById('invoice-lines-body');
    if (!tbody) return;

    const idx = tbody.querySelectorAll('.invoice-line-row').length;
    const row = document.createElement('tr');
    row.className = 'invoice-line-row';
    row.innerHTML = `
        <td><span class="line-pos text-muted">${idx + 1}</span></td>
        <td><input type="text" name="lines[${idx}][bezeichnung]" required placeholder="Leistungsbeschreibung" style="min-width:200px"></td>
        <td><input type="number" name="lines[${idx}][menge]" value="1" min="0.001" step="0.001" style="width:80px" required></td>
        <td>
            <select name="lines[${idx}][einheit]" style="width:80px">
                <option value="Stk.">Stk.</option>
                <option value="h">h</option>
                <option value="Tage">Tage</option>
                <option value="Monat">Monat</option>
                <option value="Pauschale">Pauschale</option>
                <option value="km">km</option>
            </select>
        </td>
        <td>
            <select name="lines[${idx}][ust_satz]" style="width:80px">
                <option value="19">19 %</option>
                <option value="7">7 %</option>
                <option value="0">0 %</option>
            </select>
        </td>
        <td><input type="number" name="lines[${idx}][einzelpreis]" value="0.00" min="0" step="0.01" style="width:110px" required></td>
        <td class="td-right line-netto text-muted">0,00 €</td>
        <td class="td-right line-brutto font-bold">0,00 €</td>
        <td>
            <button type="button" class="btn btn-danger btn-sm" onclick="removeInvoiceLine(this)">✕</button>
        </td>`;
    tbody.appendChild(row);
    calcInvoiceTotals();
}

function removeInvoiceLine(btn) {
    btn.closest('.invoice-line-row').remove();
    // Renumber positions
    document.querySelectorAll('.invoice-line-row').forEach((row, i) => {
        const posEl = row.querySelector('.line-pos');
        if (posEl) posEl.textContent = i + 1;
        // Update indices in name attributes
        row.querySelectorAll('[name]').forEach(el => {
            el.name = el.name.replace(/lines\[\d+\]/, `lines[${i}]`);
        });
    });
    calcInvoiceTotals();
}

// Init totals on page load
document.addEventListener('DOMContentLoaded', () => {
    if (document.getElementById('invoice-lines-body')) {
        calcInvoiceTotals();
    }
});

// ── Konto-Suche (Typeahead) ───────────────────────────────────
function setupAccountSearch(inputId, hiddenId) {
    const input  = document.getElementById(inputId);
    const hidden = document.getElementById(hiddenId);
    if (!input || !hidden) return;

    let dropdown = null;
    let debounce = null;

    input.addEventListener('input', () => {
        clearTimeout(debounce);
        const q = input.value.trim();
        if (q.length < 1) { closeDropdown(); return; }

        debounce = setTimeout(async () => {
            const res  = await fetch(`/accounts/search?q=${encodeURIComponent(q)}`);
            const data = await res.json();
            renderDropdown(data);
        }, 200);
    });

    function renderDropdown(items) {
        closeDropdown();
        if (!items.length) return;

        dropdown = document.createElement('ul');
        dropdown.className = 'account-dropdown';
        dropdown.style.cssText = `
            position:absolute; z-index:50; background:#fff; border:1px solid var(--color-border);
            border-radius:var(--radius); width:100%; max-height:220px; overflow-y:auto;
            list-style:none; padding:0; margin:0; box-shadow:var(--shadow);
        `;

        items.forEach(item => {
            const li = document.createElement('li');
            li.style.cssText = 'padding:.5rem .75rem; cursor:pointer; font-size:.875rem; border-bottom:1px solid var(--color-border)';
            li.innerHTML = `<strong>${item.kontonummer}</strong> – ${item.bezeichnung} <small style="color:var(--color-muted)">(${item.kontenart})</small>`;
            li.addEventListener('mousedown', () => {
                input.value  = `${item.kontonummer} – ${item.bezeichnung}`;
                hidden.value = item.id;
                closeDropdown();
            });
            dropdown.appendChild(li);
        });

        const wrapper = input.closest('.account-search-wrap') || input.parentElement;
        wrapper.style.position = 'relative';
        wrapper.appendChild(dropdown);
    }

    function closeDropdown() {
        dropdown?.remove();
        dropdown = null;
    }

    input.addEventListener('blur', () => setTimeout(closeDropdown, 150));
}

// ── Inline-Edit (Belegdatum / Rechnungsnr. in der Info-Bar) ──────
document.addEventListener('click', (e) => {
    const trigger = e.target.closest('.inline-edit-trigger');
    if (!trigger || trigger.querySelector('input')) return;

    const bar      = trigger.closest('[data-beleg-id]');
    if (!bar) return;

    const field    = trigger.dataset.field;
    const type     = trigger.dataset.type || 'text';
    const rawValue = trigger.dataset.raw || '';

    const input = document.createElement('input');
    input.type  = type;
    input.value = rawValue;
    input.style.cssText = 'font-size:inherit;padding:2px 5px;border:1px solid var(--color-border);border-radius:var(--radius);background:#fff;min-width:' + (type === 'date' ? '140px' : '180px');
    if (field === 'supplier_name') {
        input.setAttribute('list', 'supplier-datalist');
        input.setAttribute('autocomplete', 'off');
    }

    const originalHTML = trigger.innerHTML;
    trigger.innerHTML  = '';
    trigger.appendChild(input);
    input.focus();
    if (type === 'text') input.select();

    let cancelled = false;

    async function save() {
        if (cancelled) return;
        const newValue = input.value.trim();

        const body = new URLSearchParams({
            rechnungs_nr:  field === 'rechnungs_nr'  ? newValue : bar.dataset.rechnungsNr  || '',
            belegtyp:      bar.dataset.belegtyp || '',
            beleg_datum:   field === 'beleg_datum'   ? newValue : bar.dataset.belegDatum   || '',
            betrag_brutto: bar.dataset.betragBrutto  || '',
            supplier_name: field === 'supplier_name' ? newValue : bar.dataset.supplierName || '',
        });

        try {
            const res = await fetch(`/belege/${bar.dataset.belegId}/meta`, {
                method: 'POST',
                headers: { 'X-Requested-With': 'XMLHttpRequest', 'Content-Type': 'application/x-www-form-urlencoded' },
                body: body.toString(),
            });
            if (!res.ok) throw new Error();

            // Update stored data-attribute
            if (field === 'beleg_datum') {
                bar.dataset.belegDatum = newValue;
                trigger.dataset.raw    = newValue;
                if (newValue) {
                    const [y, m, d]    = newValue.split('-');
                    trigger.textContent = `${d}.${m}.${y}`;
                } else {
                    trigger.innerHTML  = '<span class="text-muted">– setzen –</span>';
                }
            } else if (field === 'supplier_name') {
                bar.dataset.supplierName = newValue;
                trigger.dataset.raw      = newValue;
                trigger.textContent      = newValue || '';
                if (!newValue) trigger.innerHTML = '<span class="text-muted">– setzen –</span>';
            } else {
                bar.dataset.rechnungsNr = newValue;
                trigger.dataset.raw     = newValue;
                trigger.textContent     = newValue || '';
                if (!newValue) trigger.innerHTML = '<span class="text-muted">– setzen –</span>';
            }
        } catch (_) {
            trigger.innerHTML = originalHTML;
        }
    }

    input.addEventListener('blur', save);
    input.addEventListener('keydown', (e) => {
        if (e.key === 'Enter')  { e.preventDefault(); input.blur(); }
        if (e.key === 'Escape') { cancelled = true; trigger.innerHTML = originalHTML; }
    });
});

// ── Konto-Select: Doppelklick / Enter → Kontonr. ins Filterfeld ──
// selectedIndex ist beim click-Event garantiert korrekt; beim dblclick-Event
// kann er in manchen Browsern bei List-Boxes zurückgesetzt sein (kein Prior-Select),
// daher wird er beim click gecacht und als Fallback genutzt.
const _kontoNrCache = {};
document.addEventListener('click', (e) => {
    const sel = e.target.closest('select#kategorie_konto_id, select#zahlungskonto_id');
    if (!sel) return;
    const opt = sel.options[sel.selectedIndex];
    if (opt && opt.value) _kontoNrCache[sel.id] = opt.textContent.split(' – ')[0].trim();
});

function transferKontoNr(select) {
    const opt = select.options[select.selectedIndex];
    const kontoNr = (opt && opt.value)
        ? opt.textContent.split(' – ')[0].trim()
        : (_kontoNrCache[select.id] ?? null);
    if (!kontoNr) return;
    const filterInput = document.querySelector(`.konto-filter[data-target="${select.id}"]`);
    if (filterInput) filterInput.value = kontoNr;
}

document.addEventListener('dblclick', (e) => {
    const select = e.target.closest('select#kategorie_konto_id, select#zahlungskonto_id');
    if (select) transferKontoNr(select);
});

document.addEventListener('keydown', (e) => {
    if (e.key !== 'Enter') return;
    const select = e.target.closest('select#kategorie_konto_id, select#zahlungskonto_id');
    if (select) {
        e.preventDefault();
        transferKontoNr(select);
    }
});

// ── Flash Message Auto-dismiss ────────────────────────────────
document.addEventListener('DOMContentLoaded', () => {
    document.querySelectorAll('.flash').forEach(el => {
        if (el.closest('#ki-badge')) return;       // KI-Badge nie auto-dismissen
        if (el.classList.contains('flash-persistent')) return; // z.B. Bewirtungshinweis
        setTimeout(() => {
            el.style.transition = 'opacity .4s';
            el.style.opacity = '0';
            setTimeout(() => el.remove(), 400);
        }, 20000);
    });
});