// ── Theme + Settings ──

import { $, api, getCsrf } from './util.js';
import { state } from './state.js';
import { renderSettingsPanel as renderNotifSettings } from './notifications.js';

const overlay = $('settings-overlay');
const themeList = $('settings-theme-list');

// Render theme list in settings
function renderThemes() {
    if (!themeList) return;
    const current = (designPending?.theme) || localStorage.getItem('hyprcrd-theme') || 'slate';
    themeList.innerHTML = '';
    for (const [key, t] of Object.entries(window.themes)) {
        const btn = document.createElement('button');
        const active = key === current;
        btn.className = `flex items-center gap-3 px-3 py-2.5 text-left text-xs border transition-colors rounded ${active ? 'border-t-accent text-t-bright' : 'border-t-border text-t-muted hover:border-t-accent hover:text-t-bright'}`;
        btn.innerHTML = `<span class="w-4 h-4 rounded-full shrink-0" style="background:${t.vars['--t-accent']}"></span>
            <span class="font-pixel text-[10px] flex-1">${t.label}</span>
            ${active ? '<i class="ph ph-check text-t-accent text-sm"></i>' : ''}`;
        btn.onclick = () => {
            window.applyTheme(key);
            if (designPending) {
                designPending.theme = key;
                window.saveDesign(designPending);
                flashSaved();
            }
            renderThemes();
            window._renderBoard?.();
        };
        themeList.appendChild(btn);
    }
}

// Tab switching
overlay?.querySelectorAll('.settings-tab').forEach(tab => {
    tab.addEventListener('click', () => {
        overlay.querySelectorAll('.settings-tab').forEach(t => t.classList.remove('active'));
        tab.classList.add('active');
        const panel = tab.dataset.tab;
        overlay.querySelectorAll('[id^="settings-panel-"]').forEach(p => p.classList.add('hidden'));
        $(`settings-panel-${panel}`)?.classList.remove('hidden');
        if (panel === 'caldav') { window._loadCaldavSettings?.(); }
        if (panel === 'relay') { window._loadRelaySettings?.(); }
        if (panel === 'notifications') renderNotifSettings();
        if (panel === 'behavior') initBehaviorSettings();
        if (panel === 'theme') initDesignSettings();
        if (panel === 'plugins') window._openPluginSettings?.();
        if (panel !== 'theme') setPeekUI(false);
    });
});

// ── Design (fonts, geometry, borders, spacing, effects, presets) ──
let designPending = null;

const SLIDER_FIELDS = [
    ['setting-radius-card',   'radiusCard',   'val-radius-card'],
    ['setting-radius-button', 'radiusButton', 'val-radius-button'],
    ['setting-radius-input',  'radiusInput',  'val-radius-input'],
    ['setting-radius-modal',  'radiusModal',  'val-radius-modal'],
    ['setting-radius-tag',    'radiusTag',    'val-radius-tag'],
    ['setting-radius-image',  'radiusImage',  'val-radius-image'],
    ['setting-border-card',   'borderCard',   'val-border-card'],
    ['setting-bar-height',    'barHeight',    'val-bar-height'],
    ['setting-pad-card',      'padCard',      'val-pad-card'],
    ['setting-gap-board',     'gapBoard',     'val-gap-board'],
    ['setting-lift-card',     'liftCard',     'val-lift-card'],
    ['setting-blur-overlay',  'blurOverlay',  'val-blur-overlay'],
];
const SELECT_FIELDS = [
    ['setting-font-headline', 'fontHeadline'],
    ['setting-font-content',  'fontContent'],
    ['setting-font-ui',       'fontUi'],
    ['setting-border-style',  'borderStyle'],
    ['setting-shadow-card',   'shadowCard'],
    ['setting-shadow-modal',  'shadowModal'],
    ['setting-shadow-ui',     'shadowUi'],
    ['setting-anim-speed',    'animSpeed'],
];

function updatePreview() {
    const preview = $('theme-preview');
    if (!preview || !designPending) return;
    const d = designPending, fonts = window.themeFonts, shadows = window.designShadows;
    const set = (k, v) => preview.style.setProperty(k, v);
    set('--tp-font-headline', fonts[d.fontHeadline] || fonts.pixel);
    set('--tp-font-content',  fonts[d.fontContent]  || fonts.mono);
    set('--tp-font-ui',       fonts[d.fontUi]       || fonts.pixel);
    set('--tp-radius-card',   d.radiusCard + 'px');
    set('--tp-radius-button', d.radiusButton + 'px');
    set('--tp-radius-input',  d.radiusInput + 'px');
    set('--tp-radius-tag',    d.radiusTag + 'px');
    set('--tp-border-card',   d.borderCard + 'px');
    set('--tp-border-style',  d.borderStyle);
    set('--tp-bar-height',    d.barHeight + 'px');
    set('--tp-pad-card',      d.padCard + 'px');
    set('--tp-shadow-card',   shadows[d.shadowCard] || 'none');
}

function fillFontSelect(id, value) {
    const el = $(id);
    if (!el) return;
    el.innerHTML = '';
    for (const [key, label] of Object.entries(window.themeFontLabels)) {
        const opt = document.createElement('option');
        opt.value = key; opt.textContent = label;
        if (key === value) opt.selected = true;
        el.appendChild(opt);
    }
}

function syncControlsFromPending() {
    if (!designPending) return;
    fillFontSelect('setting-font-headline', designPending.fontHeadline);
    fillFontSelect('setting-font-content',  designPending.fontContent);
    fillFontSelect('setting-font-ui',       designPending.fontUi);
    for (const [id, key] of SELECT_FIELDS) {
        if (id.startsWith('setting-font-')) continue;
        const el = $(id);
        if (el) el.value = String(designPending[key] ?? '');
    }
    for (const [id, key, valId] of SLIDER_FIELDS) {
        const v = String(designPending[key] ?? 0);
        const el = $(id);
        if (el) el.value = v;
        const valEl = $(valId);
        if (valEl) valEl.textContent = v;
    }
}

function commitDesign() {
    updatePreview();
    window.applyDesign(designPending);
    window.saveDesign(designPending);
    flashSaved();
}

let saveFlashTimer = null;
function flashSaved() {
    const status = $('design-status');
    if (!status) return;
    status.textContent = 'saved';
    status.style.color = 'var(--t-accent)';
    clearTimeout(saveFlashTimer);
    saveFlashTimer = setTimeout(() => {
        status.textContent = 'auto-saving';
        status.style.color = 'var(--t-dim)';
    }, 700);
}

let designWired = false;

function initDesignSettings() {
    designPending = window.loadDesign();
    syncControlsFromPending();
    updatePreview();
    refreshPresetSelect();

    const status = $('design-status');
    if (status) { status.textContent = 'auto-saving'; status.style.color = 'var(--t-dim)'; }

    if (designWired) return;
    designWired = true;

    // Selects
    for (const [id, key] of SELECT_FIELDS) {
        const el = $(id);
        if (!el) continue;
        el.addEventListener('change', () => {
            designPending[key] = el.value;
            commitDesign();
        });
    }

    // Sliders
    for (const [id, key, valId] of SLIDER_FIELDS) {
        const el = $(id);
        if (!el) continue;
        el.addEventListener('input', () => {
            const num = Number(el.value);
            designPending[key] = num;
            const v = $(valId);
            if (v) v.textContent = num;
            commitDesign();
        });
    }
}

$('design-reset')?.addEventListener('click', () => {
    designPending = { ...window.designDefaults };
    syncControlsFromPending();
    commitDesign();
    renderThemes();
});

// ── Peek toggle (hide background dim so the real board is visible behind the popup) ──
function setPeekUI(peeking) {
    document.body.classList.toggle('settings-peeking', peeking);
    const sw = $('design-peek-toggle');
    if (sw) sw.classList.toggle('on', peeking);
}
const peekRow = $('design-peek-row');
if (peekRow) peekRow.onclick = () => {
    setPeekUI(!document.body.classList.contains('settings-peeking'));
};

// ── Presets ──

function loadUserPresets() {
    try { return JSON.parse(localStorage.getItem('hyprcrd-design-presets') || '{}'); }
    catch { return {}; }
}
function saveUserPresets(p) {
    localStorage.setItem('hyprcrd-design-presets', JSON.stringify(p));
}

function refreshPresetSelect() {
    const sel = $('design-preset-select');
    if (!sel) return;
    // localStorage wins over sel.value: the <select> survives settings
    // close/reopen, so its lingering value would otherwise mask the
    // persisted selection on the next refresh.
    const cur = localStorage.getItem('hyprcrd-design-active-preset') || sel.value || '';
    sel.innerHTML = '';
    const builtinGroup = document.createElement('optgroup');
    builtinGroup.label = 'built-in';
    for (const name of Object.keys(window.builtinPresets || {})) {
        const opt = document.createElement('option');
        opt.value = 'builtin:' + name; opt.textContent = name;
        builtinGroup.appendChild(opt);
    }
    sel.appendChild(builtinGroup);
    const user = loadUserPresets();
    const names = Object.keys(user);
    if (names.length) {
        const userGroup = document.createElement('optgroup');
        userGroup.label = 'custom';
        for (const name of names) {
            const opt = document.createElement('option');
            opt.value = 'user:' + name; opt.textContent = name;
            userGroup.appendChild(opt);
        }
        sel.appendChild(userGroup);
    }
    if (cur && sel.querySelector(`option[value="${CSS.escape(cur)}"]`)) sel.value = cur;
    // Disable delete button when a built-in preset is selected
    const delBtn = $('design-preset-delete');
    if (delBtn) {
        const isUser = sel.value?.startsWith('user:');
        delBtn.disabled = !isUser;
        delBtn.style.opacity = isUser ? '' : '0.35';
        delBtn.style.cursor = isUser ? '' : 'not-allowed';
    }
}

function getSelectedPreset() {
    const sel = $('design-preset-select');
    if (!sel?.value) return null;
    const [kind, ...rest] = sel.value.split(':');
    const name = rest.join(':');
    if (kind === 'builtin') return window.builtinPresets?.[name] ? { ...window.builtinPresets[name] } : null;
    if (kind === 'user')    return loadUserPresets()[name] ? { ...loadUserPresets()[name] } : null;
    return null;
}

function loadSelectedPreset() {
    const cfg = getSelectedPreset();
    if (!cfg) return;
    designPending = { ...window.designDefaults, ...cfg };
    syncControlsFromPending();
    commitDesign();
    renderThemes();
    const sel = $('design-preset-select');
    if (sel?.value) localStorage.setItem('hyprcrd-design-active-preset', sel.value);
}
$('design-preset-select')?.addEventListener('change', loadSelectedPreset);

$('design-preset-save')?.addEventListener('click', () => {
    const nameEl = $('design-preset-name');
    const name = (nameEl?.value || '').trim();
    if (!name) { nameEl?.focus(); return; }
    const presets = loadUserPresets();
    presets[name] = { ...designPending };
    saveUserPresets(presets);
    if (nameEl) nameEl.value = '';
    refreshPresetSelect();
    const sel = $('design-preset-select');
    if (sel) sel.value = 'user:' + name;
    localStorage.setItem('hyprcrd-design-active-preset', 'user:' + name);
    const status = $('design-status');
    if (status) { status.textContent = `preset "${name}" saved`; status.style.color = 'var(--t-accent)'; }
});

$('design-preset-delete')?.addEventListener('click', () => {
    const sel = $('design-preset-select');
    if (!sel?.value?.startsWith('user:')) return;
    const name = sel.value.slice('user:'.length);
    const presets = loadUserPresets();
    delete presets[name];
    saveUserPresets(presets);
    if (localStorage.getItem('hyprcrd-design-active-preset') === 'user:' + name) {
        localStorage.removeItem('hyprcrd-design-active-preset');
    }
    refreshPresetSelect();
});

$('design-preset-export')?.addEventListener('click', async () => {
    const cfg = designPending || window.loadDesign();
    const json = JSON.stringify(cfg, null, 2);
    // Best-effort clipboard (silently fails on non-secure contexts)
    let copied = false;
    try {
        if (navigator.clipboard?.writeText) {
            await navigator.clipboard.writeText(json);
            copied = true;
        }
    } catch {}
    // Always also trigger a file download — works regardless of clipboard support
    try {
        const blob = new Blob([json], { type: 'application/json' });
        const url = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = 'hyprcrd-design.json';
        document.body.appendChild(a);
        a.click();
        document.body.removeChild(a);
        setTimeout(() => URL.revokeObjectURL(url), 1000);
    } catch (e) {
        console.error('design export failed', e);
    }
    const status = $('design-status');
    if (status) {
        status.textContent = copied ? 'downloaded + copied to clipboard' : 'downloaded hyprcrd-design.json';
        status.style.color = 'var(--t-accent)';
    }
});

$('design-preset-import')?.addEventListener('click', async () => {
    const { showDialog } = await import('./dialog.js');
    const json = await showDialog({ title: 'Import design JSON', input: true, placeholder: '{"radiusCard":8,...}', okLabel: 'Import' });
    if (!json) return;
    try {
        const cfg = JSON.parse(json);
        designPending = { ...window.designDefaults, ...cfg };
        syncControlsFromPending();
        commitDesign();
        renderThemes();
    } catch {
        const status = $('design-status');
        if (status) { status.textContent = 'invalid JSON'; status.style.color = 'var(--t-danger)'; }
    }
});

// Open/Close
function updateStats() {
    const sc = $('stats-cards'); if (sc) sc.textContent = state.cards?.length || 0;
    const sb = $('stats-buckets'); if (sb) sb.textContent = state.buckets?.length || 0;
    const tags = new Set(); (state.cards || []).forEach(c => (c.tags || '').split(',').forEach(t => { if (t) tags.add(t); }));
    const st = $('stats-tags'); if (st) st.textContent = tags.size;
}

// Vault key
$('settings-vault-save')?.addEventListener('click', async () => {
    const key = $('settings-vault-key')?.value;
    const status = $('settings-vault-status');
    if (!key || key.length < 8) { if (status) { status.textContent = 'min 8 characters'; status.style.color = 'var(--t-danger)'; } return; }
    const res = await fetch('api/auth/vault-key', {
        method: 'POST', headers: { 'Content-Type': 'application/json', 'X-CSRF-Token': getCsrf() },
        body: JSON.stringify({ key }),
    }).then(r => r.json()).catch(() => ({ error: 'failed' }));
    if (res.ok) {
        if (status) { status.textContent = res.rekey ? 'saved — notes will re-encrypt on next sync' : 'saved'; status.style.color = 'var(--t-accent)'; }
        $('settings-vault-key').value = '';
        if (res.rekey) window._triggerSync?.();
    } else {
        if (status) { status.textContent = res.error || 'failed'; status.style.color = 'var(--t-danger)'; }
    }
});

async function loadVaultStatus() {
    const res = await api('api/auth/vault-key');
    if (!res) return;
    const status = $('settings-vault-status');
    const input = $('settings-vault-key');
    if (input) input.placeholder = res.has_key ? '(set — enter new to change)' : 'enter vault key';
    if (status && res.has_key) { status.textContent = 'vault key is set'; status.style.color = 'var(--t-dim)'; }
}

$('settings-btn')?.addEventListener('click', () => {
    renderThemes();
    initDesignSettings();
    updateStats();
    loadVaultStatus();
    overlay?.classList.add('open');
});
function closeSettings() {
    overlay?.classList.remove('open');
    setPeekUI(false);
}
$('settings-close')?.addEventListener('click', closeSettings);
overlay?.addEventListener('click', e => { if (e.target === overlay) closeSettings(); });

// Password change
$('settings-pw-save')?.addEventListener('click', async () => {
    const current = $('settings-pw-current')?.value;
    const newPw = $('settings-pw-new')?.value;
    const confirm = $('settings-pw-confirm')?.value;
    const status = $('settings-pw-status');

    if (!current || !newPw) { if (status) { status.textContent = 'fill all fields'; status.style.color = 'var(--t-danger)'; } return; }
    if (newPw !== confirm) { if (status) { status.textContent = 'passwords do not match'; status.style.color = 'var(--t-danger)'; } return; }
    if (newPw.length < 10) { if (status) { status.textContent = 'min 10 characters'; status.style.color = 'var(--t-danger)'; } return; }

    const res = await fetch('api/auth/password', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json', 'X-CSRF-Token': getCsrf() },
        body: JSON.stringify({ current, new: newPw }),
    }).then(r => r.json()).catch(() => ({ error: 'network error' }));

    if (res.ok) {
        if (status) { status.textContent = res.rekey ? 'password changed — re-encrypting notes...' : 'password changed'; status.style.color = 'var(--t-accent)'; }
        $('settings-pw-current').value = '';
        $('settings-pw-new').value = '';
        $('settings-pw-confirm').value = '';
        // Trigger sync to re-push notes with new encryption key
        if (res.rekey) {
            window._triggerSync?.();
            setTimeout(() => { if (status) status.textContent = 'password changed, notes re-encrypted'; }, 3000);
        }
    } else {
        if (status) { status.textContent = res.error || 'failed'; status.style.color = 'var(--t-danger)'; }
    }
});

function initBehaviorSettings() {
    const selects = {
        'setting-current-days': { key: 'hyprcrd-current-days', def: '2' },
        'setting-card-height':  { key: 'hyprcrd-card-height',  def: '180' },
        'setting-card-width':   { key: 'hyprcrd-card-width',   def: '280' },
        'setting-body-lines':   { key: 'hyprcrd-body-lines',   def: '5' },
        'setting-click-action': { key: 'hyprcrd-click-action',  def: 'preview' },
        'setting-esc-action':   { key: 'hyprcrd-esc-action',    def: 'close' },
    };
    const toggles = {
        'setting-current-include-synced': { key: 'hyprcrd-current-include-synced', def: '0' },
        'setting-show-tags':              { key: 'hyprcrd-show-tags',              def: '1' },
        'setting-show-thumbnails':        { key: 'hyprcrd-show-thumbnails',        def: '1' },
        'setting-show-done-badge':        { key: 'hyprcrd-show-done-badge',        def: '1' },
        'setting-confirm-delete':         { key: 'hyprcrd-confirm-delete',         def: '1' },
        'setting-auto-save':              { key: 'hyprcrd-auto-save',              def: '0' },
        'setting-open-switches-bucket':   { key: 'hyprcrd-open-switches-bucket',   def: '0' },
        'setting-tasks-show-shopping':    { key: 'hyprcrd-tasks-show-shopping',    def: '0' },
    };
    for (const [id, cfg] of Object.entries(selects)) {
        const el = $(id);
        if (!el) continue;
        el.value = localStorage.getItem(cfg.key) || cfg.def;
        el.onchange = () => { localStorage.setItem(cfg.key, el.value); applyBehavior(); };
    }
    for (const [id, cfg] of Object.entries(toggles)) {
        const el = $(id);
        if (!el) continue;
        const isOn = (localStorage.getItem(cfg.key) ?? cfg.def) === '1';
        el.classList.toggle('on', isOn);
        const row = el.closest('.toggle-row');
        if (row) {
            row.onclick = () => {
                const nowOn = !el.classList.contains('on');
                el.classList.toggle('on', nowOn);
                localStorage.setItem(cfg.key, nowOn ? '1' : '0');
                applyBehavior();
            };
        }
    }
}

function applyBehavior() {
    const board = $('board');
    if (board) {
        const w = localStorage.getItem('hyprcrd-card-width') || '280';
        board.style.gridTemplateColumns = `repeat(auto-fill, minmax(${w}px, 1fr))`;
    }
    document.documentElement.style.setProperty('--card-min-h', (localStorage.getItem('hyprcrd-card-height') || '180') + 'px');
    document.documentElement.style.setProperty('--card-body-lines', localStorage.getItem('hyprcrd-body-lines') || '5');
    window._renderBoard?.();
}

// Apply on load
applyBehavior();

// Apply saved theme on load
window.applyTheme(localStorage.getItem('hyprcrd-theme') || 'slate');