// account.js
document.addEventListener('DOMContentLoaded', () => {

    const toast = document.getElementById('account-toast');

    function showToast(msg, isError = false) {
        toast.textContent = msg;
        toast.classList.toggle('account-toast--error', isError);
        toast.classList.add('account-toast--visible');
        setTimeout(() => toast.classList.remove('account-toast--visible'), 3000);
    }

    async function patchJson(url, data) {
        const res = await fetch(url, {
            method:  'PATCH',
            headers: { 'Content-Type': 'application/json' },
            body:    JSON.stringify(data),
        });
        const json = await res.json();
        if (!res.ok) throw new Error(json.error ?? 'Fehler');
        return json;
    }

    // ── Farbfeld: Picker ↔ Hex-Input synchron + Live-Kontrast ────────────────
    const colorPicker = document.getElementById('account-color-picker');
    const colorHex    = document.getElementById('account-color');

    function applyHeaderContrast(hex) {
        const r = parseInt(hex.slice(1, 3), 16);
        const g = parseInt(hex.slice(3, 5), 16);
        const b = parseInt(hex.slice(5, 7), 16);
        const brightness = (r * 299 + g * 587 + b * 114) / 1000;
        const isLight = brightness > 128;
        const root = document.documentElement;
        root.style.setProperty('--header-text',       isLight ? '#1a2a3a' : '#ffffff');
        root.style.setProperty('--header-text-muted', isLight ? 'rgba(26, 42, 58, 0.65)' : 'rgba(255, 255, 255, 0.75)');
        root.style.setProperty('--header-overlay',    isLight ? 'rgba(0, 0, 0, 0.08)'    : 'rgba(255, 255, 255, 0.18)');
    }

    if (colorPicker && colorHex) {
        colorPicker.addEventListener('input', () => {
            colorHex.value = colorPicker.value;
            applyHeaderContrast(colorPicker.value);
        });
        colorHex.addEventListener('input', () => {
            if (/^#[0-9a-fA-F]{6}$/.test(colorHex.value)) {
                colorPicker.value = colorHex.value;
                applyHeaderContrast(colorHex.value);
            }
        });
    }

    // ── Account-Formular ──────────────────────────────────────────────────────
    const btnAccountSave = document.getElementById('btn-account-save');
    if (btnAccountSave) {
        btnAccountSave.addEventListener('click', async () => {
            const payload = {
                name:             document.getElementById('account-name').value.trim(),
                trackingInterval: parseInt(document.getElementById('account-interval').value, 10),
            };

            if (colorHex) {
                const hex = colorHex.value.trim();
                if (hex && !/^#[0-9a-fA-F]{6}$/.test(hex)) {
                    showToast('Ungültiger Hex-Wert. Beispiel: #3a7bbf', true);
                    return;
                }
                payload.primaryColor = hex || '';
            }

            try {
                await patchJson('/api/account', payload);
                showToast('Gespeichert. Seite wird neu geladen…');
                setTimeout(() => window.location.reload(), 1200);
            } catch (e) {
                showToast(e.message, true);
            }
        });
    }

    // ── Besitzer des Accounts ─────────────────────────────────────────────────
    const superadminSelect = document.getElementById('superadmin-select');
    if (superadminSelect && !superadminSelect.disabled) {
        superadminSelect.addEventListener('change', async () => {
            const selectedName = superadminSelect.options[superadminSelect.selectedIndex].text;
            if (!confirm(`${selectedName} zum neuen Kontoinhaber machen?`)) {
                // Auswahl zurücksetzen
                superadminSelect.value = superadminSelect.dataset.original;
                return;
            }

            try {
                await patchJson('/api/account/superadmin', {
                    userId: parseInt(superadminSelect.value, 10),
                });
                showToast('Kontoinhaber geändert. Seite wird neu geladen…');
                setTimeout(() => window.location.reload(), 1500);
            } catch (e) {
                showToast(e.message, true);
                superadminSelect.value = superadminSelect.dataset.original;
            }
        });

        // Original-Wert merken für Rollback
        superadminSelect.dataset.original = superadminSelect.value;
    }

    // ── Passwort-Toggle ───────────────────────────────────────────────────────
    const btnPwToggle = document.getElementById('btn-pw-toggle');
    const pwSection   = document.getElementById('pw-section');
    if (btnPwToggle && pwSection) {
        btnPwToggle.addEventListener('click', (e) => {
            e.preventDefault();
            const open       = !pwSection.hidden;
            pwSection.hidden = open;
            btnPwToggle.textContent = open ? 'ändern' : 'abbrechen';
        });
    }

    // ── Theme-Picker ──────────────────────────────────────────────────────────
    const themePicker = document.getElementById('theme-picker');
    if (themePicker) {
        themePicker.querySelectorAll('input[name="theme"]').forEach(radio => {
            radio.addEventListener('change', async () => {
                const theme = radio.value;
                try {
                    await patchJson('/api/account/user', { theme });
                    // Optionen visuell aktualisieren
                    themePicker.querySelectorAll('.theme-option').forEach(opt => {
                        opt.classList.toggle('theme-option--active', opt.dataset.theme === theme);
                    });
                    document.body.dataset.theme = theme;
                    showToast('Darstellung geändert.');
                } catch (e) {
                    showToast(e.message, true);
                }
            });
        });
    }

    // ── Benutzer-Formular ─────────────────────────────────────────────────────
    const btnUserSave = document.getElementById('btn-user-save');
    if (btnUserSave) {
        btnUserSave.addEventListener('click', async () => {
            const data = {
                firstName: document.getElementById('user-firstname').value.trim(),
                lastName:  document.getElementById('user-lastname').value.trim(),
                email:     document.getElementById('user-email').value.trim(),
            };

            if (pwSection && !pwSection.hidden) {
                const pwNew    = document.getElementById('user-pw-new').value;
                const pwRepeat = document.getElementById('user-pw-repeat').value;
                if (pwNew !== pwRepeat) {
                    showToast('Die Passwörter stimmen nicht überein.', true);
                    return;
                }
                data.currentPassword = document.getElementById('user-pw-current').value;
                data.newPassword     = pwNew;
            }

            try {
                await patchJson('/api/account/user', data);
                showToast('Gespeichert.');
                if (pwSection) {
                    pwSection.hidden = true;
                    document.getElementById('btn-pw-toggle').textContent = 'ändern';
                    ['user-pw-current', 'user-pw-new', 'user-pw-repeat'].forEach(id => {
                        document.getElementById(id).value = '';
                    });
                }
            } catch (e) {
                showToast(e.message, true);
            }
        });
    }
});