/**
 * webtrees: online genealogy
 * Copyright (C) 2023 webtrees development team
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

function TreeViewHandler (treeview_instance, ged) {
  var tv = this; // Store "this" for usage within jQuery functions where "this" is not this ;-)

  this.treeview = $('#' + treeview_instance + '_in');
  this.loadingImage = $('#' + treeview_instance + '_loading');
  this.toolbox = $('#tv_tools');
  this.buttons = $('.tv_button:first', this.toolbox);
  this.zoom = 100; // in percent
  this.boxWidth = 180; // default family box width
  this.boxExpandedWidth = 250; // default expanded family box width
  this.cookieDays = 3; // lifetime of preferences memory, in days
  this.ajaxDetails = document.getElementById(treeview_instance + '_out').dataset.urlDetails + '&instance=' + encodeURIComponent(treeview_instance);
  this.ajaxPersons = document.getElementById(treeview_instance + '_out').dataset.urlIndividuals + '&instance=' + encodeURIComponent(treeview_instance);

  this.container = this.treeview.parent(); // Store the container element ("#" + treeview_instance + "_out")
  this.auto_box_width = false;
  this.updating = false;

  // Restore user preferences
  if (readCookie('compact') === 'true') {
    tv.compact();
  }

  // Drag handlers for the treeview canvas
  (function () {
    let dragging = false;
    let isDown = false;
    let drag_start_x;
    let drag_start_y;

    tv.treeview.on('mousedown touchstart', function (event) {
    
      let pageX = (event.type === 'touchstart') ? event.touches[0].pageX : event.pageX;
      let pageY = (event.type === 'touchstart') ? event.touches[0].pageY : event.pageY;

      drag_start_x = tv.treeview.offset().left - pageX;
      drag_start_y = tv.treeview.offset().top - pageY;
      isDown = true;
    });

    $(document).on('mousemove touchmove', function (event) {
      if (isDown) {
        event.preventDefault();
        dragging = true;

        let pageX = (event.type === 'touchmove') ? event.touches[0].pageX : event.pageX;
        let pageY = (event.type === 'touchmove') ? event.touches[0].pageY : event.pageY;

        tv.treeview.offset({
          left: pageX + drag_start_x,
          top: pageY + drag_start_y,
        });
      }
    });

    $(document).on('mouseup touchend', function (event) {
      isDown = false;
      if (dragging) {
        event.preventDefault();
        dragging = false;
        tv.updateTree();
      }
    });
  })();

  // Add click handlers to buttons
  tv.toolbox.find('#tvbCompact').each(function (index, tvCompact) {
    tvCompact.onclick = function () {
      tv.compact();
    };
  });
  // If we click the "hide/show all partners" button, toggle the setting before reloading the page
  tv.toolbox.find('#tvbAllPartners').each(function (index, tvAllPartners) {
    tvAllPartners.onclick = function () {
      createCookie('allPartners', readCookie('allPartners') === 'true' ? 'false' : 'true', tv.cookieDays);
      document.location = document.location;
    };
  });
  tv.toolbox.find('#tvbOpen').each(function (index, tvbOpen) {
    var b = $(tvbOpen, tv.toolbox);
    tvbOpen.onclick = function () {
      b.addClass('tvPressed');
      tv.setLoading();
      var e = jQuery.Event('click');
      tv.treeview.find('.tv_box:not(.boxExpanded)').each(function (index, box) {
        var pos = $(box, tv.treeview).offset();
        if (pos.left >= tv.leftMin && pos.left <= tv.leftMax && pos.top >= tv.topMin && pos.top <= tv.topMax) {
          tv.expandBox(box, e);
        }
      });
      b.removeClass('tvPressed');
      tv.setComplete();
    };
  });
  tv.toolbox.find('#tvbClose').each(function (index, tvbClose) {
    var b = $(tvbClose, tv.toolbox);
    tvbClose.onclick = function () {
      b.addClass('tvPressed');
      tv.setLoading();
      tv.treeview.find('.tv_box.boxExpanded').each(function (index, box) {
        $(box).css('display', 'none').removeClass('boxExpanded').parent().find('.tv_box.collapsedContent').css('display', 'block');
      });
      b.removeClass('tvPressed');
      tv.setComplete();
    };
  });

  tv.centerOnRoot(); // fire ajax update if needed, which call setComplete() when all is loaded
}
/**
 * Class TreeView setLoading method
 */
TreeViewHandler.prototype.setLoading = function () {
  this.treeview.css('cursor', 'wait');
  this.loadingImage.css('display', 'block');
};
/**
 * Class TreeView setComplete  method
 */
TreeViewHandler.prototype.setComplete = function () {
  this.treeview.css('cursor', 'move');
  this.loadingImage.css('display', 'none');
};

/**
 * Class TreeView getSize  method
 * Store the viewport current size
 */
TreeViewHandler.prototype.getSize = function () {
  var tv = this;
  // retrieve the current container bounding box
  var container = tv.container.parent();
  var offset = container.offset();
  tv.leftMin = offset.left;
  tv.leftMax = tv.leftMin + container.innerWidth();
  tv.topMin = offset.top;
  tv.topMax = tv.topMin + container.innerHeight();
  /*
	 var frm = $("#tvTreeBorder");
	 tv.treeview.css("width", frm.width());
	 tv.treeview.css("height", frm.height()); */
};

/**
 * Class TreeView updateTree  method
 * Perform ajax requests to complete the tree after drag
 * param boolean @center center on root person when done
 */
TreeViewHandler.prototype.updateTree = function (center, button) {
  var tv = this; // Store "this" for usage within jQuery functions where "this" is not this ;-)
  var to_load = [];
  var elts = [];
  this.getSize();

  // check which td with datafld attribute are within the container bounding box
  // and therefore need to be dynamically loaded
  tv.treeview.find('td[abbr]').each(function (index, el) {
    el = $(el, tv.treeview);
    var pos = el.offset();
    if (pos.left >= tv.leftMin && pos.left <= tv.leftMax && pos.top >= tv.topMin && pos.top <= tv.topMax) {
      to_load.push(el.attr('abbr'));
      elts.push(el);
    }
  });
  // if some boxes need update, we perform an ajax request
  if (to_load.length > 0) {
    tv.updating = true;
    tv.setLoading();
    jQuery.ajax({
      url: tv.ajaxPersons,
      dataType: 'json',
      data: 'q=' + to_load.join(';'),
      success: function (ret) {
        var nb = elts.length;
        var root_element = $('.rootPerson', this.treeview);
        var l = root_element.offset().left;
        for (var i = 0; i < nb; i++) {
          elts[i].removeAttr('abbr').html(ret[i]);
        }
        // we now adjust the draggable treeview size to its content size
        tv.getSize();
      },
      complete: function () {
        if (tv.treeview.find('td[abbr]').length) {
          tv.updateTree(center, button); // recursive call
        }
        // the added boxes need that in mode compact boxes
        if (tv.auto_box_width) {
          tv.treeview.find('.tv_box').css('width', 'auto');
        }
        tv.updating = true; // avoid an unuseful recursive call when all requested persons are loaded
        if (center) {
          tv.centerOnRoot();
        }
        if (button) {
          button.removeClass('tvPressed');
        }
        tv.setComplete();
        tv.updating = false;
      },
      timeout: function () {
        if (button) {
          button.removeClass('tvPressed');
        }
        tv.updating = false;
        tv.setComplete();
      }
    });
  } else {
    if (button) {
      button.removeClass('tvPressed');
    }
    tv.setComplete();
  }
  return false;
};

/**
 * Class TreeView compact method
 */
TreeViewHandler.prototype.compact = function () {
  var tv = this;
  var b = $('#tvbCompact', tv.toolbox);
  tv.setLoading();
  if (tv.auto_box_width) {
    var w = tv.boxWidth * (tv.zoom / 100) + 'px';
    var ew = tv.boxExpandedWidth * (tv.zoom / 100) + 'px';
    tv.treeview.find('.tv_box:not(boxExpanded)', tv.treeview).css('width', w);
    tv.treeview.find('.boxExpanded', tv.treeview).css('width', ew);
    tv.auto_box_width = false;
    if (readCookie('compact')) {
      createCookie('compact', false, tv.cookieDays);
    }
    b.removeClass('tvPressed');
  } else {
    tv.treeview.find('.tv_box').css('width', 'auto');
    tv.auto_box_width = true;
    if (!readCookie('compact')) {
      createCookie('compact', true, tv.cookieDays);
    }
    if (!tv.updating) {
      tv.updateTree();
    }
    b.addClass('tvPressed');
  }
  tv.setComplete();
  return false;
};

/**
 * Class TreeView centerOnRoot method
 */
TreeViewHandler.prototype.centerOnRoot = function () {
  this.loadingImage.css('display', 'block');
  var tv = this;
  var tvc = this.container;
  var tvc_width = tvc.innerWidth() / 2;
  if (Number.isNaN(tvc_width)) {
    return false;
  }
  var tvc_height = tvc.innerHeight() / 2;
  var root_person = $('.rootPerson', this.treeview);

  if (!this.updating) {
    tv.setComplete();
  }
  return false;
};

/**
 * Class TreeView expandBox method
 * Called ONLY for elements which have NOT the class tv_link to avoid un-useful requests to the server
 * @param {string} box   - the person box element
 * @param {string} event - the call event
 */
TreeViewHandler.prototype.expandBox = function (box, event) {
  var t = $(event.target);
  if (t.hasClass('tv_link')) {
    return false;
  }

  var box = $(box, this.treeview);
  var bc = box.parent(); // bc is Box Container
  var pid = box.attr('abbr');
  var tv = this; // Store "this" for usage within jQuery functions where "this" is not this ;-)
  var expanded;
  var collapsed;

  if (bc.hasClass('detailsLoaded')) {
    collapsed = bc.find('.collapsedContent');
    expanded = bc.find('.tv_box:not(.collapsedContent)');
  } else {
    // Cache the box content as an hidden person's box in the box's parent element
    expanded = box;
    collapsed = box.clone();
    bc.append(collapsed.addClass('collapsedContent').css('display', 'none'));
    // we add a waiting image at the right side of the box
    var loading_image = this.loadingImage.find('img').clone().addClass('tv_box_loading').css('display', 'block');
    box.prepend(loading_image);
    tv.updating = true;
    tv.setLoading();
    // perform the Ajax request and load the result in the box
    box.load(tv.ajaxDetails + '&pid=' + encodeURIComponent(pid), function () {
      // If Lightbox module is active, we reinitialize it for the new links
      if (typeof CB_Init === 'function') {
        CB_Init();
      }
      box.css('width', tv.boxExpandedWidth * (tv.zoom / 100) + 'px');
      loading_image.remove();
      bc.addClass('detailsLoaded');
      tv.setComplete();
      tv.updating = false;
    });
  }
  if (box.hasClass('boxExpanded')) {
    expanded.css('display', 'none');
    collapsed.css('display', 'block');
    box.removeClass('boxExpanded');
  } else {
    expanded.css('display', 'block');
    collapsed.css('display', 'none');
    expanded.addClass('boxExpanded');
  }
  // we must adjust the draggable treeview size to its content size
  this.getSize();
  return false;
};

/**
 * @param {string} name
 * @param {string} value
 * @param {number} days
 */
function createCookie (name, value, days) {
  if (days) {
    var date = new Date();
    date.setTime(date.getTime() + (days * 24 * 60 * 60 * 1000));
    document.cookie = name + '=' + value + '; expires=' + date.toGMTString() + '; path=/';
  } else {
    document.cookie = name + '=' + value + '; path=/';
  }
}

/**
 * @param   {string} name
 * @returns {string|null}
 */
function readCookie (name) {
  var name_equals = name + '=';
  var ca = document.cookie.split(';');
  for (var i = 0; i < ca.length; i++) {
    var c = ca[i];
    while (c.charAt(0) === ' ') {
      c = c.substring(1, c.length);
    }
    if (c.indexOf(name_equals) === 0) {
      return c.substring(name_equals.length, c.length);
    }
  }
  return null;
}