// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.

define([
    "nbextensions/widgets/widgets/js/widget",
], function(widget) {

    var ColorPicker = widget.DOMWidgetView.extend({
        render: function() {
            this.$el.addClass("widget-hbox widget-colorpicker");

            this.$label = $("<div />")
                .addClass("widget-label")
                .appendTo(this.$el);

            this.$color_container = $("<div />")
                .addClass("hbox")
                .appendTo(this.$el);

            this.$textbox = $("<input type='text' />")
                .addClass("form-control")
                .appendTo(this.$color_container)
                .val(this.model.get("value"));

            this.$colorpicker = $("<input type='color' />")
                .addClass("btn btn-default")
                .appendTo(this.$color_container);

            this.listenTo(this.model, "change:value", this._update_value, this);
            this.listenTo(this.model, "change:description", this._update_description, this);
            this.$colorpicker.on("change", this._picker_change.bind(this));
            this.$textbox.on("change", this._text_change.bind(this));

            this._update_value();
            this._update_description();
        },
        _update_value: function() {
            var value = this.model.get("value");
            this.$colorpicker.val(color2hex(value));
            this.$textbox.val(value);
        },
        _update_description: function() {
            var description = this.model.get('description');
            if (description.length === 0) {
                this.$label.hide();
            } else {
                this.typeset(this.$label, description);
                this.$label.show();
            }
        },
        _picker_change: function() {
            this.model.set("value", this.$colorpicker.val());
            this.touch();
        },
        _text_change: function() {
            this.model.set("value", this._validate_color(this.$textbox.val(),
                                                         this.model.get("value")));
            this.touch();
        },
        _validate_color: function(color, fallback) {
            return color.match(/#[a-fA-F0-9]{3}(?:[a-fA-F0-9]{3})?$/) || 
              named_colors[color.toLowerCase()] ? color: fallback;
        },
    });

    named_colors = { aliceblue: "#f0f8ff", antiquewhite: "#faebd7", aqua: "#00ffff", aquamarine: "#7fffd4", azure: "#f0ffff", beige: "#f5f5dc", bisque: "#ffe4c4", black: "#000000", blanchedalmond: "#ffebcd", blue: "#0000ff", blueviolet: "#8a2be2", brown: "#a52a2a", burlywood: "#deb887", cadetblue: "#5f9ea0", chartreuse: "#7fff00", chocolate: "#d2691e", coral: "#ff7f50", cornflowerblue: "#6495ed", cornsilk: "#fff8dc", crimson: "#dc143c", cyan: "#00ffff", darkblue: "#00008b", darkcyan: "#008b8b", darkgoldenrod: "#b8860b", darkgray: "#a9a9a9", darkgrey: "#a9a9a9", darkgreen: "#006400", darkkhaki: "#bdb76b", darkmagenta: "#8b008b", darkolivegreen: "#556b2f", darkorange: "#ff8c00", darkorchid: "#9932cc", darkred: "#8b0000", darksalmon: "#e9967a", darkseagreen: "#8fbc8f", darkslateblue: "#483d8b", darkslategray: "#2f4f4f", darkslategrey: "#2f4f4f", darkturquoise: "#00ced1", darkviolet: "#9400d3", deeppink: "#ff1493", deepskyblue: "#00bfff", dimgray : "#696969", dimgrey : "#696969", dodgerblue: "#1e90ff", firebrick: "#b22222", floralwhite: "#fffaf0", forestgreen: "#228b22", fuchsia: "#ff00ff", gainsboro: "#dcdcdc", ghostwhite: "#f8f8ff", gold: "#ffd700", goldenrod: "#daa520", gray: "#808080", grey: "#808080", green: "#008000", greenyellow: "#adff2f", honeydew: "#f0fff0", hotpink: "#ff69b4", indianred: "#cd5c5c", indigo: "#4b0082", ivory: "#fffff0", khaki: "#f0e68c", lavender: "#e6e6fa", lavenderblush: "#fff0f5", lawngreen: "#7cfc00", lemonchiffon: "#fffacd", lightblue: "#add8e6", lightcoral: "#f08080", lightcyan: "#e0ffff", lightgoldenrodyellow: "#fafad2", lightgreen: "#90ee90", lightgray: "#d3d3d3", lightgrey: "#d3d3d3", lightpink: "#ffb6c1", lightsalmon: "#ffa07a", lightseagreen: "#20b2aa", lightskyblue: "#87cefa", lightslategray: "#778899", lightslategrey: "#778899", lightsteelblue: "#b0c4de", lightyellow: "#ffffe0", lime: "#00ff00", limegreen: "#32cd32", linen: "#faf0e6", magenta: "#ff00ff", maroon: "#800000", mediumaquamarine: "#66cdaa", mediumblue: "#0000cd", mediumorchid: "#ba55d3", mediumpurple: "#9370db", mediumseagreen: "#3cb371", mediumslateblue: "#7b68ee", mediumspringgreen: "#00fa9a", mediumturquoise: "#48d1cc", mediumvioletred: "#c71585", midnightblue: "#191970", mintcream: "#f5fffa", mistyrose: "#ffe4e1", moccasin: "#ffe4b5", navajowhite: "#ffdead", navy: "#000080", oldlace: "#fdf5e6", olive: "#808000", olivedrab: "#6b8e23", orange: "#ffa500", orangered: "#ff4500", orchid: "#da70d6", palegoldenrod: "#eee8aa", palegreen: "#98fb98", paleturquoise: "#afeeee", palevioletred: "#db7093", papayawhip: "#ffefd5", peachpuff: "#ffdab9", peru: "#cd853f", pink: "#ffc0cb", plum: "#dda0dd", powderblue: "#b0e0e6", purple: "#800080", red: "#ff0000", rosybrown: "#bc8f8f", royalblue: "#4169e1", saddlebrown: "#8b4513", salmon: "#fa8072", sandybrown: "#f4a460", seagreen: "#2e8b57", seashell: "#fff5ee", sienna: "#a0522d", silver: "#c0c0c0", skyblue: "#87ceeb", slateblue: "#6a5acd", slategray: "#708090", slategrey: "#708090", snow: "#fffafa", springgreen: "#00ff7f", steelblue: "#4682b4", tan: "#d2b48c", teal: "#008080", thistle: "#d8bfd8", tomato: "#ff6347", turquoise: "#40e0d0", violet: "#ee82ee", wheat: "#f5deb3", white: "#ffffff", whitesmoke: "#f5f5f5", yellow: "#ffff00", yellowgreen: "#9acd32", };

    /*
     * From a valid html color (named color, 6-digits or 3-digits hex format)
     * return a 6-digits hexadecimal color #rrggbb.
     */
    function color2hex(color) {
        return named_colors[color.toLowerCase()] || rgb3_to_rgb6(color);
    };

    function rgb3_to_rgb6(rgb) {
        if (rgb.length === 7) {
            return rgb;
        } else { 
            return '#' + rgb.charAt(1) + rgb.charAt(1) +
                         rgb.charAt(2) + rgb.charAt(2) +
                         rgb.charAt(3) + rgb.charAt(3);
        } 
    };

    return {
        ColorPicker: ColorPicker,
    };
});

