/* vim:ts=4:sts=4:sw=4:
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Ajax.org Code Editor (ACE).
 *
 * The Initial Developer of the Original Code is
 * Ajax.org B.V.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *      Fabian Jakobs <fabian AT ajax DOT org>
 *      Julian Viereck <julian.viereck@gmail.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
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 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * ***** END LICENSE BLOCK ***** */

define(function(require, exports, module) {
"use strict";

var Range = require("../range").Range;
var dom = require("../lib/dom");

var Marker = function(parentEl) {
    this.element = dom.createElement("div");
    this.element.className = "ace_layer ace_marker-layer";
    parentEl.appendChild(this.element);
};

(function() {

    this.$padding = 0;

    this.setPadding = function(padding) {
        this.$padding = padding;
    };
    this.setSession = function(session) {
        this.session = session;
    };
    
    this.setMarkers = function(markers) {
        this.markers = markers;
    };

    this.update = function(config) {
        var config = config || this.config;
        if (!config)
            return;

        this.config = config;


        var html = [];
        for (var key in this.markers) {
            var marker = this.markers[key];

            if (!marker.range) {
                marker.update(html, this, this.session, config);
                continue;
            }

            var range = marker.range.clipRows(config.firstRow, config.lastRow);
            if (range.isEmpty()) continue;

            range = range.toScreenRange(this.session);
            if (marker.renderer) {
                var top = this.$getTop(range.start.row, config);
                var left = Math.round(
                    this.$padding + range.start.column * config.characterWidth
                );
                marker.renderer(html, range, left, top, config);
            }
            else if (range.isMultiLine()) {
                if (marker.type == "text") {
                    this.drawTextMarker(html, range, marker.clazz, config);
                } else {
                    this.drawMultiLineMarker(
                        html, range, marker.clazz, config,
                        marker.type
                    );
                }
            }
            else {
                this.drawSingleLineMarker(
                    html, range, marker.clazz + " start", config,
                    null, marker.type
                );
            }
        }
        this.element = dom.setInnerHtml(this.element, html.join(""));
    };

    this.$getTop = function(row, layerConfig) {
        return (row - layerConfig.firstRowScreen) * layerConfig.lineHeight;
    };

    // Draws a marker, which spans a range of text on multiple lines 
    this.drawTextMarker = function(stringBuilder, range, clazz, layerConfig) {
        // selection start
        var row = range.start.row;

        var lineRange = new Range(
            row, range.start.column,
            row, this.session.getScreenLastRowColumn(row)
        );
        this.drawSingleLineMarker(stringBuilder, lineRange, clazz + " start", layerConfig, 1, "text");

        // selection end
        row = range.end.row;
        lineRange = new Range(row, 0, row, range.end.column);
        this.drawSingleLineMarker(stringBuilder, lineRange, clazz, layerConfig, 0, "text");

        for (row = range.start.row + 1; row < range.end.row; row++) {
            lineRange.start.row = row;
            lineRange.end.row = row;
            lineRange.end.column = this.session.getScreenLastRowColumn(row);
            this.drawSingleLineMarker(stringBuilder, lineRange, clazz, layerConfig, 1, "text");
        }
    };

    // Draws a multi line marker, where lines span the full width
    this.drawMultiLineMarker = function(stringBuilder, range, clazz, config, type) {
        var padding = type === "background" ? 0 : this.$padding;
        // from selection start to the end of the line
        var height = config.lineHeight;
        var top = this.$getTop(range.start.row, config);
        var left = Math.round(padding + range.start.column * config.characterWidth);

        stringBuilder.push(
            "<div class='", clazz, " start' style='",
            "height:", height, "px;",
            "right:0;",
            "top:", top, "px;",
            "left:", left, "px;'></div>"
        );

        // from start of the last line to the selection end
        top = this.$getTop(range.end.row, config);
        var width = Math.round(range.end.column * config.characterWidth);

        stringBuilder.push(
            "<div class='", clazz, "' style='",
            "height:", height, "px;",
            "width:", width, "px;",
            "top:", top, "px;",
            "left:", padding, "px;'></div>"
        );

        // all the complete lines
        height = (range.end.row - range.start.row - 1) * config.lineHeight;
        if (height < 0)
            return;
        top = this.$getTop(range.start.row + 1, config);

        stringBuilder.push(
            "<div class='", clazz, "' style='",
            "height:", height, "px;",
            "right:0;",
            "top:", top, "px;",
            "left:", padding, "px;'></div>"
        );
    };

    // Draws a marker which covers part or whole width of a single screen line
    this.drawSingleLineMarker = function(stringBuilder, range, clazz, layerConfig, extraLength, type) {
        var padding = type === "background" ? 0 : this.$padding;
        var height = layerConfig.lineHeight;

        if (type === "background")
            var width = layerConfig.width;
        else
            width = Math.round((range.end.column + (extraLength || 0) - range.start.column) * layerConfig.characterWidth);

        var top = this.$getTop(range.start.row, layerConfig);
        var left = Math.round(
            padding + range.start.column * layerConfig.characterWidth
        );

        stringBuilder.push(
            "<div class='", clazz, "' style='",
            "height:", height, "px;",
            "width:", width, "px;",
            "top:", top, "px;",
            "left:", left,"px;'></div>"
        );
    };

}).call(Marker.prototype);

exports.Marker = Marker;

});