var utils = require("./utils"),
    browser = require("./browser");

module.exports = function(window, less, options) {

    function errorHTML(e, rootHref) {
        var id = 'less-error-message:' + utils.extractId(rootHref || "");
        var template = '<li><label>{line}</label><pre class="{class}">{content}</pre></li>';
        var elem = window.document.createElement('div'), timer, content, errors = [];
        var filename = e.filename || rootHref;
        var filenameNoPath = filename.match(/([^\/]+(\?.*)?)$/)[1];

        elem.id        = id;
        elem.className = "less-error-message";

        content = '<h3>'  + (e.type || "Syntax") + "Error: " + (e.message || 'There is an error in your .less file') +
            '</h3>' + '<p>in <a href="' + filename   + '">' + filenameNoPath + "</a> ";

        var errorline = function (e, i, classname) {
            if (e.extract[i] !== undefined) {
                errors.push(template.replace(/\{line\}/, (parseInt(e.line, 10) || 0) + (i - 1))
                    .replace(/\{class\}/, classname)
                    .replace(/\{content\}/, e.extract[i]));
            }
        };

        if (e.extract) {
            errorline(e, 0, '');
            errorline(e, 1, 'line');
            errorline(e, 2, '');
            content += 'on line ' + e.line + ', column ' + (e.column + 1) + ':</p>' +
                '<ul>' + errors.join('') + '</ul>';
        }
        if (e.stack && (e.extract || options.logLevel >= 4)) {
            content += '<br/>Stack Trace</br />' + e.stack.split('\n').slice(1).join('<br/>');
        }
        elem.innerHTML = content;

        // CSS for error messages
        browser.createCSS(window.document, [
            '.less-error-message ul, .less-error-message li {',
            'list-style-type: none;',
            'margin-right: 15px;',
            'padding: 4px 0;',
            'margin: 0;',
            '}',
            '.less-error-message label {',
            'font-size: 12px;',
            'margin-right: 15px;',
            'padding: 4px 0;',
            'color: #cc7777;',
            '}',
            '.less-error-message pre {',
            'color: #dd6666;',
            'padding: 4px 0;',
            'margin: 0;',
            'display: inline-block;',
            '}',
            '.less-error-message pre.line {',
            'color: #ff0000;',
            '}',
            '.less-error-message h3 {',
            'font-size: 20px;',
            'font-weight: bold;',
            'padding: 15px 0 5px 0;',
            'margin: 0;',
            '}',
            '.less-error-message a {',
            'color: #10a',
            '}',
            '.less-error-message .error {',
            'color: red;',
            'font-weight: bold;',
            'padding-bottom: 2px;',
            'border-bottom: 1px dashed red;',
            '}'
        ].join('\n'), { title: 'error-message' });

        elem.style.cssText = [
            "font-family: Arial, sans-serif",
            "border: 1px solid #e00",
            "background-color: #eee",
            "border-radius: 5px",
            "-webkit-border-radius: 5px",
            "-moz-border-radius: 5px",
            "color: #e00",
            "padding: 15px",
            "margin-bottom: 15px"
        ].join(';');

        if (options.env === 'development') {
            timer = setInterval(function () {
                var document = window.document,
                    body = document.body;
                if (body) {
                    if (document.getElementById(id)) {
                        body.replaceChild(elem, document.getElementById(id));
                    } else {
                        body.insertBefore(elem, body.firstChild);
                    }
                    clearInterval(timer);
                }
            }, 10);
        }
    }

    function error(e, rootHref) {
        if (!options.errorReporting || options.errorReporting === "html") {
            errorHTML(e, rootHref);
        } else if (options.errorReporting === "console") {
            errorConsole(e, rootHref);
        } else if (typeof options.errorReporting === 'function') {
            options.errorReporting("add", e, rootHref);
        }
    }

    function removeErrorHTML(path) {
        var node = window.document.getElementById('less-error-message:' + utils.extractId(path));
        if (node) {
            node.parentNode.removeChild(node);
        }
    }

    function removeErrorConsole(path) {
        //no action
    }

    function removeError(path) {
        if (!options.errorReporting || options.errorReporting === "html") {
            removeErrorHTML(path);
        } else if (options.errorReporting === "console") {
            removeErrorConsole(path);
        } else if (typeof options.errorReporting === 'function') {
            options.errorReporting("remove", path);
        }
    }

    function errorConsole(e, rootHref) {
        var template = '{line} {content}';
        var filename = e.filename || rootHref;
        var errors = [];
        var content = (e.type || "Syntax") + "Error: " + (e.message || 'There is an error in your .less file') +
            " in " + filename + " ";

        var errorline = function (e, i, classname) {
            if (e.extract[i] !== undefined) {
                errors.push(template.replace(/\{line\}/, (parseInt(e.line, 10) || 0) + (i - 1))
                    .replace(/\{class\}/, classname)
                    .replace(/\{content\}/, e.extract[i]));
            }
        };

        if (e.extract) {
            errorline(e, 0, '');
            errorline(e, 1, 'line');
            errorline(e, 2, '');
            content += 'on line ' + e.line + ', column ' + (e.column + 1) + ':\n' +
                errors.join('\n');
        }
        if (e.stack && (e.extract || options.logLevel >= 4)) {
            content += '\nStack Trace\n' + e.stack;
        }
        less.logger.error(content);
    }

    return {
        add: error,
        remove: removeError
    };
};
