/* global window */

(function () {
  'use strict';

  var Luxtools = window.Luxtools || (window.Luxtools = {});

  // ============================================================
  // Open Service Module (file:// links)
  // ============================================================
  Luxtools.OpenService = (function () {
    function getServiceUrl(el) {
      var url = el.getAttribute('data-service-url') || '';
      url = (url || '').trim();
      if (!url) return '';
      // strip trailing slashes
      return url.replace(/\/+$/, '');
    }

    function pingOpenViaImage(el, rawPath) {
      var baseUrl = getServiceUrl(el);
      if (!baseUrl) return;
      var url = baseUrl + '/open?path=' + encodeURIComponent(rawPath);

      // Fire-and-forget without CORS.
      try {
        var img = new window.Image();
        img.src = url;
      } catch (e) {
        // ignore
      }
    }

    function openViaService(el, rawPath) {
      var baseUrl = getServiceUrl(el);
      if (!baseUrl) return Promise.reject(new Error('No client service configured'));

      var headers = {
        'Content-Type': 'application/json'
      };

      return window.fetch(baseUrl + '/open', {
        method: 'POST',
        mode: 'cors',
        credentials: 'omit',
        headers: headers,
        body: JSON.stringify({ path: rawPath })
      }).then(function (res) {
        if (!res.ok) {
          return res.json().catch(function () { return null; }).then(function (body) {
            var msg = (body && body.message) ? body.message : ('HTTP ' + res.status);
            throw new Error(msg);
          });
        }
        return res.json().catch(function () { return { ok: true }; });
      });
    }

    function normalizeToFileUrl(path) {
      if (!path) return '';

      // already a file URL
      if (/^file:\/\//i.test(path)) return path;

      // UNC path: \\server\share\path
      if (/^\\\\/.test(path)) {
        var p = path.replace(/^\\\\/, '');
        p = p.replace(/\\/g, '/');
        return 'file://///' + p;
      }

      // Windows drive: C:\path\to\file
      if (/^[a-zA-Z]:\\/.test(path)) {
        var drive = path[0].toUpperCase();
        var rest = path.slice(2).replace(/\\/g, '/');
        return 'file:///' + drive + ':' + rest;
      }

      // POSIX absolute: /home/user/file
      if (path[0] === '/') {
        return 'file://' + path;
      }

      // Fall back to using the provided string.
      return path;
    }

    return {
      openViaService: openViaService,
      pingOpenViaImage: pingOpenViaImage,
      normalizeToFileUrl: normalizeToFileUrl
    };
  })();
})();