// CodeMirror, copyright (c) by Marijn Haverbeke and others

// Distributed under an MIT license: https://codemirror.net/LICENSE



(function(mod) {

  if (typeof exports == "object" && typeof module == "object") // CommonJS

    mod(require("../../lib/codemirror"));

  else if (typeof define == "function" && define.amd) // AMD

    define(["../../lib/codemirror"], mod);

  else // Plain browser env

    mod(CodeMirror);

})(function(CodeMirror) {

  "use strict";



  CodeMirror.defineOption("selectionPointer", false, function(cm, val) {

    var data = cm.state.selectionPointer;

    if (data) {

      CodeMirror.off(cm.getWrapperElement(), "mousemove", data.mousemove);

      CodeMirror.off(cm.getWrapperElement(), "mouseout", data.mouseout);

      CodeMirror.off(window, "scroll", data.windowScroll);

      cm.off("cursorActivity", reset);

      cm.off("scroll", reset);

      cm.state.selectionPointer = null;

      cm.display.lineDiv.style.cursor = "";

    }

    if (val) {

      data = cm.state.selectionPointer = {

        value: typeof val == "string" ? val : "default",

        mousemove: function(event) { mousemove(cm, event); },

        mouseout: function(event) { mouseout(cm, event); },

        windowScroll: function() { reset(cm); },

        rects: null,

        mouseX: null, mouseY: null,

        willUpdate: false

      };

      CodeMirror.on(cm.getWrapperElement(), "mousemove", data.mousemove);

      CodeMirror.on(cm.getWrapperElement(), "mouseout", data.mouseout);

      CodeMirror.on(window, "scroll", data.windowScroll);

      cm.on("cursorActivity", reset);

      cm.on("scroll", reset);

    }

  });



  function mousemove(cm, event) {

    var data = cm.state.selectionPointer;

    if (event.buttons == null ? event.which : event.buttons) {

      data.mouseX = data.mouseY = null;

    } else {

      data.mouseX = event.clientX;

      data.mouseY = event.clientY;

    }

    scheduleUpdate(cm);

  }



  function mouseout(cm, event) {

    if (!cm.getWrapperElement().contains(event.relatedTarget)) {

      var data = cm.state.selectionPointer;

      data.mouseX = data.mouseY = null;

      scheduleUpdate(cm);

    }

  }



  function reset(cm) {

    cm.state.selectionPointer.rects = null;

    scheduleUpdate(cm);

  }



  function scheduleUpdate(cm) {

    if (!cm.state.selectionPointer.willUpdate) {

      cm.state.selectionPointer.willUpdate = true;

      setTimeout(function() {

        update(cm);

        cm.state.selectionPointer.willUpdate = false;

      }, 50);

    }

  }



  function update(cm) {

    var data = cm.state.selectionPointer;

    if (!data) return;

    if (data.rects == null && data.mouseX != null) {

      data.rects = [];

      if (cm.somethingSelected()) {

        for (var sel = cm.display.selectionDiv.firstChild; sel; sel = sel.nextSibling)

          data.rects.push(sel.getBoundingClientRect());

      }

    }

    var inside = false;

    if (data.mouseX != null) for (var i = 0; i < data.rects.length; i++) {

      var rect = data.rects[i];

      if (rect.left <= data.mouseX && rect.right >= data.mouseX &&

          rect.top <= data.mouseY && rect.bottom >= data.mouseY)

        inside = true;

    }

    var cursor = inside ? data.value : "";

    if (cm.display.lineDiv.style.cursor != cursor)

      cm.display.lineDiv.style.cursor = cursor;

  }

});

