/* global window, jQuery */

/**
 * Movie Import toolbar button for luxtools.
 *
 * Fetches movie metadata from OMDb (client-side) and inserts/replaces
 * a wiki markup block in the editor.
 *
 * The OMDb API key is intentionally passed to the browser via JSINFO.
 * It will be visible in browser developer tools and network requests.
 * This is an accepted tradeoff for this single-user LAN deployment.
 */
(function () {
  'use strict';

  var MARKER_BEGIN = '<!-- BEGIN MOVIE -->';
  var MARKER_END = '<!-- END MOVIE -->';

  /**
   * Get the OMDb API key from JSINFO (set by PHP in action.php).
   */
  function getApiKey() {
    if (window.JSINFO && window.JSINFO.luxtools_omdb_apikey) {
      return String(window.JSINFO.luxtools_omdb_apikey);
    }
    return '';
  }

  /**
   * Get localized string from DokuWiki's LANG object.
   */
  function lang(key, fallback) {
    if (window.LANG && window.LANG.plugins && window.LANG.plugins.luxtools &&
        window.LANG.plugins.luxtools[key]) {
      return String(window.LANG.plugins.luxtools[key]);
    }
    return fallback || key;
  }

  /**
   * Extract the first heading from the editor text.
   * DokuWiki headings use ====== Heading ====== syntax.
   * Returns the heading text trimmed, or empty string.
   */
  function extractFirstHeading(text) {
    var match = text.match(/^={2,6}\s*(.+?)\s*={2,6}\s*$/m);
    if (match && match[1]) {
      return match[1].trim();
    }
    return '';
  }

  /**
   * Parse a title string that may contain a trailing year in parentheses.
   * e.g. "Project Hail Mary (2026)" -> { title: "Project Hail Mary", year: "2026" }
   * e.g. "Inception" -> { title: "Inception", year: null }
   */
  function parseTitleYear(raw) {
    var match = raw.match(/^(.+?)\s*\((\d{4})\)\s*$/);
    if (match) {
      return { title: match[1].trim(), year: match[2] };
    }
    return { title: raw.trim(), year: null };
  }

  /**
   * Fetch movie data from OMDb.
   * Returns a Promise that resolves with the parsed JSON response.
   */
  function fetchMovie(apiKey, title, year) {
    var url = 'https://www.omdbapi.com/?apikey=' + encodeURIComponent(apiKey) +
              '&type=movie&t=' + encodeURIComponent(title);
    if (year) {
      url += '&y=' + encodeURIComponent(year);
    }

    return jQuery.ajax({
      url: url,
      dataType: 'json',
      timeout: 10000
    });
  }

  /**
   * Build the wiki markup block for a movie.
   */
  function buildMarkup(movie) {
    var lines = [];
    lines.push(MARKER_BEGIN);

    // Poster image (omit if N/A or empty)
    var poster = movie.Poster || '';
    if (poster && poster !== 'N/A') {
      lines.push('{{image>' + poster + '}}');
    }

    // Data table
    lines.push('^ Title     | ' + safe(movie.Title) + ' |');
    lines.push('^ Year      | ' + safe(movie.Year) + ' |');
    lines.push('^ Genre     | ' + safe(movie.Genre) + ' |');
    lines.push('^ Director  | ' + safe(movie.Director) + ' |');
    lines.push('^ Actors    | ' + safe(movie.Actors) + ' |');
    lines.push('^ Plot      | ' + safe(movie.Plot) + ' |');

    lines.push(MARKER_END);
    return lines.join('\n');
  }

  /**
   * Return value for table cell, replacing N/A with empty string.
   */
  function safe(val) {
    if (!val || val === 'N/A') return '';
    return String(val);
  }

  /**
   * Get the editor textarea element by id.
   */
  function getEditor(edid) {
    var id = edid || 'wiki__text';
    return document.getElementById(id);
  }

  /**
   * Main import action: prompt for title, fetch from OMDb, insert/replace markup.
   */
  function importMovie(edid) {
    var apiKey = getApiKey();
    if (!apiKey) {
      alert(lang('movie_error_no_apikey', 'OMDb API key is not configured. Set it in Admin → luxtools.'));
      return;
    }

    var editor = getEditor(edid);
    if (!editor) return;

    var text = editor.value || '';
    var heading = extractFirstHeading(text);
    var defaultTitle = heading || '';

    var input = prompt(lang('movie_prompt', 'Enter movie title (optionally with year):'), defaultTitle);
    if (input === null || input.trim() === '') return;

    var parsed = parseTitleYear(input.trim());

    fetchMovie(apiKey, parsed.title, parsed.year)
      .done(function (data) {
        if (!data || data.Response === 'False') {
          var errMsg = (data && data.Error) ? data.Error : lang('movie_error_not_found', 'Movie not found.');
          alert(errMsg);
          return;
        }

        var markup = buildMarkup(data);
        insertOrReplace(editor, markup);
      })
      .fail(function () {
        alert(lang('movie_error_fetch', 'OMDb lookup failed.'));
      });
  }

  /**
   * Insert movie markup into the editor, replacing an existing movie block if present.
   */
  function insertOrReplace(editor, markup) {
    var text = editor.value || '';

    var beginIdx = text.indexOf(MARKER_BEGIN);
    var endIdx = text.indexOf(MARKER_END);

    if (beginIdx !== -1 && endIdx !== -1 && endIdx > beginIdx) {
      // Replace existing block
      var before = text.substring(0, beginIdx);
      var after = text.substring(endIdx + MARKER_END.length);
      editor.value = before + markup + after;
    } else {
      // Append after the first heading line, or at the end
      var headingMatch = text.match(/^(={2,6}\s*.+?\s*={2,6}\s*)$/m);
      if (headingMatch) {
        var headingEnd = text.indexOf(headingMatch[0]) + headingMatch[0].length;
        editor.value = text.substring(0, headingEnd) + '\n\n' + markup + text.substring(headingEnd);
      } else {
        editor.value = text + '\n\n' + markup;
      }
    }

    // Trigger input event so DokuWiki knows the content changed
    try {
      editor.dispatchEvent(new Event('input', { bubbles: true }));
    } catch (e) {
      // IE fallback
    }
  }

  // Register toolbar button action handler.
  // DokuWiki toolbar looks for window.addBtnAction<Type> for custom button types.
  window.addBtnActionLuxtoolsMovieImport = function ($btn, props, edid) {
    $btn.on('click', function () {
      importMovie(edid);
      return false;
    });
    return 'luxtools-movie-import';
  };
})();