// ==UserScript==
// @name         Miniflux: Translate Entry to French
// @namespace    https://zoemp.be
// @version      0.7
// @description  Translate Miniflux entries to French using SimplyTranslate (Google engine)
// @include      /^https?:\/\/[^\/]+\/.*\/entry\/.*/
// @grant        GM_xmlhttpRequest
// @run-at       document-end
// ==/UserScript==

(function () {
  'use strict';

  console.log('[Miniflux Translate] Loaded on URL:', location.href);

  const isProbablyEnglish = (text) => {
    const ratio = (text.match(/[a-z]/gi) || []).length / text.length;
    const isLong = text.length > 100;
    const hasWords = /[a-z]{5,}/.test(text);
    const result = ratio > 0.4 && isLong && hasWords;
    console.log(`[Miniflux Translate] Heuristic result: ${result} (ratio: ${ratio.toFixed(2)}, length: ${text.length})`);
    return result;
  };

  const decodeEntities = (str) => {
    return str
      .replace(/'/g, `'`)
      .replace(/"/g, `"`)
      .replace(/"/g, `"`)
      .replace(/&/g, `&`)
      .replace(/&lt;/g, `<`)
      .replace(/&gt;/g, `>`)
      .replace(/&#x27;/g, `'`)
      .replace(/&nbsp;/g, ' ')
      .replace(/&#160;/g, ' ')
      .replace(/&#(\d+);/g, (_, n) => String.fromCharCode(n));
  };

  const translate = (text, cb) => {
    const form = `from=en&to=fr&text=${encodeURIComponent(text)}`;
    console.log('[Miniflux Translate] Sending translation request...');
    GM_xmlhttpRequest({
      method: 'POST',
      url: 'https://simplytranslate.org/?engine=google',
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
        'Accept': 'text/html',
        'Origin': 'null'
      },
      data: form,
      onload: (res) => {
        const match = res.responseText.match(/<textarea[^>]*id="output"[^>]*>([^<]*)<\/textarea>/);
        if (match && match[1]) {
          const raw = match[1];
          const cleaned = decodeEntities(raw);
          console.log('[Miniflux Translate] Translation successful');
          cb(cleaned);
        } else {
          console.warn('[Miniflux Translate] Failed to extract translation');
          cb('[Error: Translation not found]');
        }
      },
      onerror: () => {
        console.error('[Miniflux Translate] Network error during translation request');
        cb('[Error: Network issue]');
      }
    });
  };

  const injectButton = () => {
    const content = document.querySelector('.entry-content');
    if (!content) {
      console.warn('[Miniflux Translate] .entry-content not found');
      return;
    }

    const text = content.innerText.trim();
    if (!isProbablyEnglish(text)) {
      console.log('[Miniflux Translate] Entry appears to be in French, skipping');
      return;
    }

    if (content.querySelector('.translate-btn')) {
      console.log('[Miniflux Translate] Button already exists');
      return;
    }

    const btn = document.createElement('button');
    btn.textContent = '🈯 Traduire en français';
    btn.className = 'translate-btn';
    btn.style.cssText = `
      margin-top: 12px;
      padding: 6px 12px;
      font-size: 0.9em;
      cursor: pointer;
      background-color: #222;
      color: #fff;
      border: 1px solid #444;
      border-radius: 4px;
    `;

    btn.onclick = () => {
      btn.disabled = true;
      btn.textContent = '⏳ Traduction en cours...';
      translate(text, (translated) => {
        const div = document.createElement('div');
        div.textContent = translated;
        div.style.cssText = `
          margin-top: 12px;
          padding: 10px;
          background: rgb(51 85 67);
          border-left: 3px solid rgb(71 180 103);
          white-space: pre-wrap;
          font-family: "Geist Mono";
        `;
        content.appendChild(div);
        btn.remove();
      });
    };

    content.appendChild(btn);
    console.log('[Miniflux Translate] Button injected');
  };

  const waitUntilReady = () => {
    if (document.readyState !== 'complete') {
      console.log('[Miniflux Translate] Waiting for document...');
      return setTimeout(waitUntilReady, 100);
    }
    injectButton();
  };

  waitUntilReady();
})();