var LessError = require('./less-error'),
    transformTree = require('./transform-tree'),
    logger = require('./logger');

module.exports = function(SourceMapBuilder) {
    var ParseTree = function(root, imports) {
        this.root = root;
        this.imports = imports;
    };

    ParseTree.prototype.toCSS = function(options) {
        var evaldRoot, result = {}, sourceMapBuilder;
        try {
            evaldRoot = transformTree(this.root, options);
        } catch (e) {
            throw new LessError(e, this.imports);
        }

        try {
            var compress = Boolean(options.compress);
            if (compress) {
                logger.warn('The compress option has been deprecated. We recommend you use a dedicated css minifier, for instance see less-plugin-clean-css.');
            }

            var toCSSOptions = {
                compress: compress,
                dumpLineNumbers: options.dumpLineNumbers,
                strictUnits: Boolean(options.strictUnits),
                numPrecision: 8};

            if (options.sourceMap) {
                sourceMapBuilder = new SourceMapBuilder(options.sourceMap);
                result.css = sourceMapBuilder.toCSS(evaldRoot, toCSSOptions, this.imports);
            } else {
                result.css = evaldRoot.toCSS(toCSSOptions);
            }
        } catch (e) {
            throw new LessError(e, this.imports);
        }

        if (options.pluginManager) {
            var postProcessors = options.pluginManager.getPostProcessors();
            for (var i = 0; i < postProcessors.length; i++) {
                result.css = postProcessors[i].process(result.css, { sourceMap: sourceMapBuilder, options: options, imports: this.imports });
            }
        }
        if (options.sourceMap) {
            result.map = sourceMapBuilder.getExternalSourceMap();
        }

        result.imports = [];
        for (var file in this.imports.files) {
            if (this.imports.files.hasOwnProperty(file) && file !== this.imports.rootFilename) {
                result.imports.push(file);
            }
        }
        return result;
    };
    return ParseTree;
};