// ── hyprcrd GUI Test Runner ──
// Self-contained in-app test framework. No external dependencies.
// Activate: ?test=1 in URL or Ctrl+Shift+T
// Panel is hidden during test run so interactions are visible.
// Backup is created before and auto-restored after every run.

import { getCsrf } from '../modules/util.js';
import { stopBackgroundSync, startBackgroundSync } from '../modules/caldav.js';

const suites = [];
let currentSuite = null;

// ── Public API ──

export function describe(name, fn) {
    const suite = { name, tests: [], beforeEach: null, afterEach: null };
    currentSuite = suite;
    suites.push(suite);
    fn();
    currentSuite = null;
}

export function it(name, fn) {
    if (!currentSuite) throw new Error('it() must be inside describe()');
    currentSuite.tests.push({ name, fn });
}

export function beforeEach(fn) {
    if (currentSuite) currentSuite.beforeEach = fn;
}

export function afterEach(fn) {
    if (currentSuite) currentSuite.afterEach = fn;
}

// ── Assertions ──

export function expect(actual) {
    return {
        toBe(expected) {
            if (actual !== expected) throw new AssertionError(`expected ${json(expected)}, got ${json(actual)}`);
        },
        toEqual(expected) {
            if (JSON.stringify(actual) !== JSON.stringify(expected)) throw new AssertionError(`expected ${json(expected)}, got ${json(actual)}`);
        },
        toBeTruthy() {
            if (!actual) throw new AssertionError(`expected truthy, got ${json(actual)}`);
        },
        toBeFalsy() {
            if (actual) throw new AssertionError(`expected falsy, got ${json(actual)}`);
        },
        toContain(item) {
            if (typeof actual === 'string') {
                if (!actual.includes(item)) throw new AssertionError(`expected "${trunc(actual)}" to contain "${item}"`);
            } else if (Array.isArray(actual)) {
                if (!actual.includes(item)) throw new AssertionError(`expected array to contain ${json(item)}`);
            } else {
                throw new AssertionError('toContain requires string or array');
            }
        },
        toBeGreaterThan(n) {
            if (!(actual > n)) throw new AssertionError(`expected ${actual} > ${n}`);
        },
        toBeLessThan(n) {
            if (!(actual < n)) throw new AssertionError(`expected ${actual} < ${n}`);
        },
        toMatch(regex) {
            if (!regex.test(actual)) throw new AssertionError(`expected "${trunc(actual)}" to match ${regex}`);
        },
        toExist() {
            if (actual === null || actual === undefined) throw new AssertionError('expected to exist, got ' + json(actual));
        },
        toBeVisible() {
            if (!actual) throw new AssertionError('element is null');
            const el = typeof actual === 'string' ? document.querySelector(actual) : actual;
            if (!el) throw new AssertionError('element not found');
            if (!isVisible(el)) throw new AssertionError('expected element to be visible');
        },
        toBeHidden() {
            if (!actual) return; // null = hidden
            const el = typeof actual === 'string' ? document.querySelector(actual) : actual;
            if (!el) return;
            if (isVisible(el)) throw new AssertionError('expected element to be hidden');
        },
        toHaveCount(n) {
            const list = typeof actual === 'string' ? document.querySelectorAll(actual) : actual;
            const len = list?.length ?? 0;
            if (len !== n) throw new AssertionError(`expected ${n} elements, found ${len}`);
        },
    };
}

class AssertionError extends Error {
    constructor(msg) { super(msg); this.name = 'AssertionError'; }
}

function json(v) { try { return JSON.stringify(v); } catch { return String(v); } }
function trunc(s) { return String(s).length > 80 ? String(s).substring(0, 80) + '...' : String(s); }

function isVisible(el) {
    if (!el) return false;
    if (el.classList.contains('overlay')) return el.classList.contains('open');
    const r = el.getBoundingClientRect();
    return r.width > 0 && r.height > 0 && !el.classList.contains('hidden') && getComputedStyle(el).display !== 'none';
}

// ── DOM Helpers ──

export function $(selector) {
    return document.querySelector(selector) || document.getElementById(selector);
}

export function $$(selector) {
    return [...document.querySelectorAll(selector)];
}

export function click(selectorOrEl) {
    const el = typeof selectorOrEl === 'string' ? $(selectorOrEl) : selectorOrEl;
    if (!el) throw new Error(`click: element not found: ${selectorOrEl}`);
    el.click();
}

export function dblclick(selectorOrEl) {
    const el = typeof selectorOrEl === 'string' ? $(selectorOrEl) : selectorOrEl;
    if (!el) throw new Error(`dblclick: element not found: ${selectorOrEl}`);
    el.dispatchEvent(new MouseEvent('dblclick', { bubbles: true }));
}

export function type(selectorOrEl, text) {
    const el = typeof selectorOrEl === 'string' ? $(selectorOrEl) : selectorOrEl;
    if (!el) throw new Error(`type: element not found: ${selectorOrEl}`);
    el.focus();
    el.value = text;
    el.dispatchEvent(new Event('input', { bubbles: true }));
}

export function pressKey(key, opts = {}) {
    document.dispatchEvent(new KeyboardEvent('keydown', { key, bubbles: true, ...opts }));
}

export function rightClick(selectorOrEl, x, y) {
    const el = typeof selectorOrEl === 'string' ? $(selectorOrEl) : selectorOrEl;
    if (!el) throw new Error(`rightClick: element not found: ${selectorOrEl}`);
    const rect = el.getBoundingClientRect();
    el.dispatchEvent(new MouseEvent('contextmenu', {
        bubbles: true, clientX: x ?? rect.left + 10, clientY: y ?? rect.top + 10,
    }));
}

export async function waitFor(fn, timeout = 3000) {
    const start = Date.now();
    while (Date.now() - start < timeout) {
        try { const r = fn(); if (r) return r; } catch {}
        await sleep(50);
    }
    throw new Error(`waitFor timed out after ${timeout}ms`);
}

export function sleep(ms) {
    return new Promise(r => setTimeout(r, ms));
}

export function csrf() {
    return getCsrf();
}

export async function closeAll() {
    for (const id of ['settings-overlay', 'help', 'search', 'calendar', 'gallery', 'detail', 'modal', 'tasks']) {
        const el = document.getElementById(id);
        if (el?.classList.contains('open')) el.classList.remove('open');
    }
    document.querySelector('#ctx-menu')?.classList.add('hidden');
    document.querySelector('#select-bar')?.classList.add('hidden');
    document.querySelector('.bucket-picker')?.remove();
    document.querySelector('.orphan-lightbox')?.remove();
    // Clear multi-select
    document.querySelectorAll('.card-selected').forEach(el => {
        el.classList.remove('card-selected');
        el.querySelector('.card-select-check')?.remove();
    });
    await sleep(50);
}

// ── Backup & Restore ──

let backupBlob = null;

async function createBackup() {
    const res = await fetch('api/export');
    if (!res.ok) throw new Error('backup failed: ' + res.status);
    backupBlob = await res.blob();
}

async function restoreBackup() {
    if (!backupBlob) return;
    const form = new FormData();
    form.append('file', backupBlob, 'backup.zip');
    await fetch('api/import', { method: 'POST', body: form, headers: { 'X-CSRF-Token': csrf() } });
}

// ── Runner ──

async function runAll() {
    const results = [];
    for (const suite of suites) {
        const suiteResult = { name: suite.name, tests: [] };
        for (const test of suite.tests) {
            const entry = { name: test.name, status: 'pass', error: null, time: 0 };
            const t0 = performance.now();
            try {
                if (suite.beforeEach) await suite.beforeEach();
                await test.fn();
                if (suite.afterEach) await suite.afterEach();
            } catch (err) {
                entry.status = 'fail';
                entry.error = err.message;
                // Always run afterEach on failure too
                try { if (suite.afterEach) await suite.afterEach(); } catch {}
            }
            entry.time = Math.round(performance.now() - t0);
            suiteResult.tests.push(entry);
        }
        results.push(suiteResult);
    }
    return results;
}

// ── UI Panel ──

let panel = null;

function createPanel() {
    if (panel) { panel.remove(); panel = null; }
    panel = document.createElement('div');
    panel.id = 'test-panel';
    panel.style.cssText = 'position:fixed;top:0;left:0;right:0;bottom:0;z-index:9999;background:rgba(2,6,23,0.95);font-family:monospace;color:#cbd5e1;';
    panel.innerHTML = `
        <div id="test-header" style="position:absolute;top:0;left:0;right:0;height:44px;padding:8px 16px;border-bottom:1px solid #334155;display:flex;align-items:center;gap:12px;">
            <span style="font-weight:bold;color:#38bdf8;">hyprcrd test runner</span>
            <button id="test-run-btn" style="padding:4px 12px;background:#38bdf8;color:#0f172a;border:none;border-radius:3px;cursor:pointer;font-family:inherit;font-size:12px;">run all</button>
            <button id="test-copy-btn" style="padding:4px 12px;background:#334155;color:#94a3b8;border:none;border-radius:3px;cursor:pointer;font-family:inherit;font-size:12px;">copy</button>
            <span id="test-summary" style="font-size:12px;color:#64748b;"></span>
            <span style="flex:1"></span>
            <button id="test-close-btn" style="background:none;border:none;color:#64748b;cursor:pointer;font-size:16px;">✕</button>
        </div>
        <div id="test-output" style="position:absolute;top:44px;left:0;right:0;bottom:0;overflow-y:auto;padding:12px 16px;font-size:12px;line-height:1.8;"></div>
    `;
    document.body.appendChild(panel);
    panel.querySelector('#test-close-btn').addEventListener('click', close);
    panel.querySelector('#test-run-btn').addEventListener('click', run);
    panel.querySelector('#test-copy-btn').addEventListener('click', () => {
        const output = panel.querySelector('#test-output');
        const text = output.innerText;
        navigator.clipboard.writeText(text).then(() => {
            const btn = panel.querySelector('#test-copy-btn');
            btn.textContent = 'copied';
            btn.style.color = '#4ade80';
            setTimeout(() => { btn.textContent = 'copy'; btn.style.color = '#94a3b8'; }, 1500);
        });
    });
}

function renderResults(results) {
    const output = panel.querySelector('#test-output');
    const summary = panel.querySelector('#test-summary');
    let total = 0, passed = 0, failed = 0, totalTime = 0;

    let html = '';
    for (const suite of results) {
        html += `<div style="margin-bottom:16px;">`;
        html += `<div style="color:#94a3b8;font-weight:bold;margin-bottom:4px;">${esc(suite.name)}</div>`;
        for (const t of suite.tests) {
            total++;
            totalTime += t.time;
            if (t.status === 'pass') {
                passed++;
                html += `<div style="color:#4ade80;padding-left:16px;">✓ ${esc(t.name)} <span style="color:#475569;">${t.time}ms</span></div>`;
            } else {
                failed++;
                html += `<div style="color:#fb7185;padding-left:16px;">✗ ${esc(t.name)} <span style="color:#475569;">${t.time}ms</span></div>`;
                html += `<div style="color:#fb7185;padding-left:32px;font-size:11px;opacity:0.8;">${esc(t.error)}</div>`;
            }
        }
        html += `</div>`;
    }
    output.innerHTML = html;
    summary.textContent = `${passed}/${total} passed, ${failed} failed — ${totalTime}ms`;
    summary.style.color = failed ? '#fb7185' : '#4ade80';
}

function esc(s) { return String(s).replace(/</g, '&lt;').replace(/>/g, '&gt;'); }

async function run() {
    const output = panel.querySelector('#test-output');
    const summary = panel.querySelector('#test-summary');

    // 1. Create backup
    output.innerHTML = '<div style="color:#64748b;">creating backup...</div>';
    summary.textContent = '';
    await sleep(50);
    try {
        await createBackup();
    } catch (e) {
        output.innerHTML = `<div style="color:#fb7185;">backup failed: ${esc(e.message)}</div>`;
        return;
    }

    // 2. Stop background sync so tests don't create side effects
    stopBackgroundSync();
    window._testRunning = true;

    // 3. Hide panel so tests run against visible UI
    panel.style.display = 'none';
    await sleep(100);

    // 4. Run tests
    const results = await runAll();

    // 5. Clean up any leftover UI state
    await closeAll();

    // 6. Restore backup
    try {
        await restoreBackup();
        await window._reloadAll?.();
        await sleep(200);
    } catch {}

    // 7. Resume background sync (delay to avoid immediate re-sync creating duplicates)
    window._testRunning = false;
    setTimeout(() => startBackgroundSync(), 60000);

    // 8. Show panel with results
    panel.style.display = '';
    renderResults(results);
}

function close() {
    if (panel) { panel.remove(); panel = null; }
}

export function open() {
    createPanel();
    run();
}

// ── Auto-activate ──

if (new URLSearchParams(location.search).has('test')) {
    setTimeout(open, 1000);
}

document.addEventListener('keydown', e => {
    if (e.ctrlKey && e.shiftKey && e.key === 'T') {
        e.preventDefault();
        panel ? close() : open();
    }
});