'use strict';

// ── State ──────────────────────────────────────────────────────

let currentModel   = 'image-01';
let currentImages  = [];   // [{url, base64}]
let loading        = false;

// ── DOM refs ───────────────────────────────────────────────────

const $ = id => document.getElementById(id);

const promptInput    = $('promptInput');
const charCount      = $('charCount');
const generateForm   = $('generateForm');
const generateBtn    = $('generateBtn');
const btnIcon        = generateBtn.querySelector('.btn-icon');
const btnText        = generateBtn.querySelector('.btn-text');
const spinner        = generateBtn.querySelector('.spinner');
const errorMsg       = $('errorMsg');
const resultArea     = $('resultArea');
const resultMeta     = $('resultMeta');
const imageGrid      = $('imageGrid');
const apiKeyAlert    = $('apiKeyAlert');
const alertSettings  = $('alertSettingsBtn');
const aspectRatio    = $('aspectRatio');
const responseFormat = $('responseFormat');
const nInput         = $('nInput');
const nMinus         = $('nMinus');
const nPlus          = $('nPlus');
const seedInput      = $('seedInput');
const widthInput     = $('widthInput');
const heightInput    = $('heightInput');
const promptOptimizer= $('promptOptimizer');
const watermark      = $('watermark');
const settingsModal  = $('settingsModal');
const openSettings   = $('openSettings');
const closeSettings  = $('closeSettings');
const cancelSettings = $('cancelSettings');
const saveSettingsBtn= $('saveSettingsBtn');
const apiKeyInput    = $('apiKeyInput');
const toggleKey      = $('toggleKey');
const baseUrlInput   = $('baseUrlInput');

// ── Stepper (n) ────────────────────────────────────────────────

nMinus.addEventListener('click', () => {
  const v = parseInt(nInput.value) - 1;
  if (v >= 1) nInput.value = v;
});

nPlus.addEventListener('click', () => {
  const v = parseInt(nInput.value) + 1;
  if (v <= 9) nInput.value = v;
});

// ── Helpers ────────────────────────────────────────────────────

function setLoading(on) {
  loading = on;
  generateBtn.disabled = on;
  btnIcon.style.display = on ? 'none' : '';
  btnText.style.display = on ? 'none' : '';
  spinner.style.display = on ? 'inline' : 'none';
  generateBtn.classList.toggle('loading', on);
}

function showError(msg) {
  errorMsg.textContent = msg;
  errorMsg.style.display = 'flex';
  errorMsg.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
}

function clearError() {
  errorMsg.style.display = 'none';
}

async function api(path, opts = {}) {
  const res = await fetch(path, opts);
  const json = await res.json();
  if (!res.ok) throw new Error(json.error || `HTTP ${res.status}`);
  return json;
}

function buildPayload() {
  const n = parseInt(nInput.value);
  const seed = seedInput.value ? parseInt(seedInput.value) : undefined;
  const width  = widthInput.value  ? parseInt(widthInput.value)  : undefined;
  const height = heightInput.value ? parseInt(heightInput.value) : undefined;

  const payload = {
    model:          currentModel,
    prompt:         promptInput.value.trim(),
    aspect_ratio:   aspectRatio.value,
    response_format: responseFormat.value,
    n:              n,
  };

  if (seed)              payload.seed              = seed;
  if (width && height)  { payload.width  = width; payload.height = height; }
  if (promptOptimizer.checked) payload.prompt_optimizer = true;
  if (watermark.checked)      payload.aigc_watermark  = true;

  return payload;
}

function renderResults(images, id, successCount, failedCount) {
  currentImages = images;
  imageGrid.innerHTML = '';

  if (id) {
    resultMeta.innerHTML = `
      <span>任务 ID：<code>${id}</code></span>
      ${successCount != null ? `<span>成功 ${successCount} 张${failedCount ? `，失败 ${failedCount} 张` : ''}</span>` : ''}
    `;
    resultMeta.style.display = 'flex';
  } else {
    resultMeta.style.display = 'none';
  }

  const fmt = responseFormat.value;

  images.forEach((src, i) => {
    const card = document.createElement('div');
    card.className = 'image-card';

    const img = document.createElement('img');
    img.src = fmt === 'url' ? src : `data:image/jpeg;base64,${src}`;
    img.alt = `生成结果 ${i + 1}`;
    img.loading = 'lazy';

    const actions = document.createElement('div');
    actions.className = 'image-actions';

    const downloadBtn = document.createElement('button');
    downloadBtn.className = 'action-btn';
    downloadBtn.innerHTML = `<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"/><polyline points="7,10 12,15 17,10"/><line x1="12" y1="15" x2="12" y2="3"/></svg>下载`;
    downloadBtn.addEventListener('click', () => downloadImage(src, fmt, i));

    const copyBtn = document.createElement('button');
    copyBtn.className = 'action-btn';
    copyBtn.innerHTML = `<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="9" y="9" width="13" height="13" rx="2" ry="2"/><path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1"/></svg>复制`;
    copyBtn.addEventListener('click', () => copySrc(src, fmt, copyBtn));

    actions.appendChild(downloadBtn);
    actions.appendChild(copyBtn);
    card.appendChild(img);
    card.appendChild(actions);
    imageGrid.appendChild(card);
  });

  resultArea.style.display = 'block';
  resultArea.scrollIntoView({ behavior: 'smooth', block: 'start' });
}

function downloadImage(src, fmt, index) {
  const a = document.createElement('a');
  if (fmt === 'url') {
    a.href = src;
  } else {
    a.href = `data:image/jpeg;base64,${src}`;
  }
  a.download = `生成-${Date.now()}-${index + 1}.jpg`;
  a.target = '_blank';
  a.click();
}

async function copySrc(src, fmt, btn) {
  try {
    await navigator.clipboard.writeText(src);
    const orig = btn.innerHTML;
    btn.innerHTML = `<svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="20,6 9,17 4,12"/></svg>已复制`;
    setTimeout(() => { btn.innerHTML = orig; }, 1500);
  } catch {
    showError('复制失败');
  }
}

// ── Init ────────────────────────────────────────────────────────

async function init() {
  try {
    const cfg = await api('/api/config');
    if (!cfg.hasApiKey) apiKeyAlert.style.display = 'flex';
    baseUrlInput.value = cfg.baseUrl || 'https://api.minimaxi.com';
  } catch { /* non-fatal */ }
}

// ── Generate ────────────────────────────────────────────────────

generateForm.addEventListener('submit', async (e) => {
  e.preventDefault();
  if (loading) return;

  const prompt = promptInput.value.trim();
  if (!prompt) { showError('请输入图片描述'); return; }

  clearError();
  resultArea.style.display = 'none';
  setLoading(true);

  try {
    const payload = buildPayload();
    const data = await api('/api/generate', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload),
    });

    const images = data.images || [];
    if (images.length === 0) {
      throw new Error('未返回任何图片');
    }

    renderResults(images, data.id, data.success_count, data.failed_count);

  } catch (err) {
    showError(err.message);
  } finally {
    setLoading(false);
  }
});

// ── Prompt char count ──────────────────────────────────────────

promptInput.addEventListener('input', () => {
  charCount.textContent = `${promptInput.value.length} / 1500`;
});

// ── Settings modal ──────────────────────────────────────────────

function openModal() {
  settingsModal.classList.add('open');
  apiKeyInput.focus();
}

function closeModal() {
  settingsModal.classList.remove('open');
  clearError();
}

openSettings.addEventListener('click', openModal);
alertSettings.addEventListener('click', openModal);
closeSettings.addEventListener('click', closeModal);
cancelSettings.addEventListener('click', closeModal);
settingsModal.addEventListener('click', e => { if (e.target === settingsModal) closeModal(); });

toggleKey.addEventListener('click', () => {
  apiKeyInput.type = apiKeyInput.type === 'password' ? 'text' : 'password';
});

saveSettingsBtn.addEventListener('click', async () => {
  clearError();
  const apiKey  = apiKeyInput.value.trim();
  const baseUrl = baseUrlInput.value.trim() || 'https://api.minimaxi.com';
  try {
    await api('/api/config', {
      method:  'POST',
      headers: { 'Content-Type': 'application/json' },
      body:    JSON.stringify({ apiKey, baseUrl }),
    });
    if (apiKey) apiKeyAlert.style.display = 'none';
    closeModal();
  } catch (err) {
    showError(err.message);
  }
});

// ── Start ──────────────────────────────────────────────────────

init();