// 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)
    // Plain browser env
    else 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
    }
})