/*
 Copyright 2012-2015, Yahoo Inc.
 Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
 */
var fs = require('fs'),
    path = require('path'),
    handlebars = require('handlebars').create(),
    annotator = require('./annotator'),
    helpers = require('./helpers'),
    templateFor = function(name) {
        return handlebars.compile(
            fs.readFileSync(
                path.resolve(__dirname, 'templates', name + '.txt'),
                'utf8'
            )
        );
    },
    headerTemplate = templateFor('head'),
    footerTemplate = templateFor('foot'),
    detailTemplate = handlebars.compile(
        [
            '<tr>',
            '<td class="line-count quiet">{{#show_lines}}{{maxLines}}{{/show_lines}}</td>',
            '<td class="line-coverage quiet">{{#show_line_execution_counts lineCoverage}}{{maxLines}}{{/show_line_execution_counts}}</td>',
            '<td class="text"><pre class="prettyprint lang-js">{{#show_code annotatedCode}}{{/show_code}}</pre></td>',
            '</tr>\n'
        ].join('')
    ),
    summaryTableHeader = [
        '<div class="pad1">',
        '<table class="coverage-summary">',
        '<thead>',
        '<tr>',
        '   <th data-col="file" data-fmt="html" data-html="true" class="file">File</th>',
        '   <th data-col="pic" data-type="number" data-fmt="html" data-html="true" class="pic"></th>',
        '   <th data-col="statements" data-type="number" data-fmt="pct" class="pct">Statements</th>',
        '   <th data-col="statements_raw" data-type="number" data-fmt="html" class="abs"></th>',
        '   <th data-col="branches" data-type="number" data-fmt="pct" class="pct">Branches</th>',
        '   <th data-col="branches_raw" data-type="number" data-fmt="html" class="abs"></th>',
        '   <th data-col="functions" data-type="number" data-fmt="pct" class="pct">Functions</th>',
        '   <th data-col="functions_raw" data-type="number" data-fmt="html" class="abs"></th>',
        '   <th data-col="lines" data-type="number" data-fmt="pct" class="pct">Lines</th>',
        '   <th data-col="lines_raw" data-type="number" data-fmt="html" class="abs"></th>',
        '</tr>',
        '</thead>',
        '<tbody>'
    ].join('\n'),
    summaryLineTemplate = handlebars.compile(
        [
            '<tr>',
            '<td class="file {{reportClasses.statements}}" data-value="{{file}}"><a href="{{output}}">{{file}}</a></td>',
            '<td data-value="{{metrics.statements.pct}}" class="pic {{reportClasses.statements}}"><div class="chart">{{#show_picture}}{{metrics.statements.pct}}{{/show_picture}}</div></td>',
            '<td data-value="{{metrics.statements.pct}}" class="pct {{reportClasses.statements}}">{{metrics.statements.pct}}%</td>',
            '<td data-value="{{metrics.statements.total}}" class="abs {{reportClasses.statements}}">{{metrics.statements.covered}}/{{metrics.statements.total}}</td>',
            '<td data-value="{{metrics.branches.pct}}" class="pct {{reportClasses.branches}}">{{metrics.branches.pct}}%</td>',
            '<td data-value="{{metrics.branches.total}}" class="abs {{reportClasses.branches}}">{{metrics.branches.covered}}/{{metrics.branches.total}}</td>',
            '<td data-value="{{metrics.functions.pct}}" class="pct {{reportClasses.functions}}">{{metrics.functions.pct}}%</td>',
            '<td data-value="{{metrics.functions.total}}" class="abs {{reportClasses.functions}}">{{metrics.functions.covered}}/{{metrics.functions.total}}</td>',
            '<td data-value="{{metrics.lines.pct}}" class="pct {{reportClasses.lines}}">{{metrics.lines.pct}}%</td>',
            '<td data-value="{{metrics.lines.total}}" class="abs {{reportClasses.lines}}">{{metrics.lines.covered}}/{{metrics.lines.total}}</td>',
            '</tr>\n'
        ].join('\n\t')
    ),
    summaryTableFooter = ['</tbody>', '</table>', '</div>'].join('\n'),
    emptyClasses = {
        statements: 'empty',
        lines: 'empty',
        functions: 'empty',
        branches: 'empty'
    };

helpers.registerHelpers(handlebars);

var standardLinkMapper = {
    getPath: function(node) {
        if (typeof node === 'string') {
            return node;
        }
        var filePath = node.getQualifiedName();
        if (node.isSummary()) {
            if (filePath !== '') {
                filePath += '/index.html';
            } else {
                filePath = 'index.html';
            }
        } else {
            filePath += '.html';
        }
        return filePath;
    },

    relativePath: function(source, target) {
        var targetPath = this.getPath(target),
            sourcePath = path.dirname(this.getPath(source));
        return path.relative(sourcePath, targetPath);
    },

    assetPath: function(node, name) {
        return this.relativePath(this.getPath(node), name);
    }
};

function getBreadcrumbHtml(node, linkMapper) {
    var parent = node.getParent(),
        nodePath = [],
        linkPath;

    while (parent) {
        nodePath.push(parent);
        parent = parent.getParent();
    }

    linkPath = nodePath.map(function(ancestor) {
        var target = linkMapper.relativePath(node, ancestor),
            name = ancestor.getRelativeName() || 'All files';
        return '<a href="' + target + '">' + name + '</a>';
    });

    linkPath.reverse();
    return linkPath.length > 0
        ? linkPath.join(' / ') + ' ' + node.getRelativeName()
        : 'All files';
}

function fillTemplate(node, templateData, linkMapper, context) {
    var summary = node.getCoverageSummary();
    templateData.entity = node.getQualifiedName() || 'All files';
    templateData.metrics = summary;
    templateData.reportClass = context.classForPercent(
        'statements',
        summary.statements.pct
    );
    templateData.pathHtml = getBreadcrumbHtml(node, linkMapper);
    templateData.base = {
        css: linkMapper.assetPath(node, 'base.css')
    };
    templateData.sorter = {
        js: linkMapper.assetPath(node, 'sorter.js'),
        image: linkMapper.assetPath(node, 'sort-arrow-sprite.png')
    };
    templateData.blockNavigation = {
        js: linkMapper.assetPath(node, 'block-navigation.js')
    };
    templateData.prettify = {
        js: linkMapper.assetPath(node, 'prettify.js'),
        css: linkMapper.assetPath(node, 'prettify.css')
    };
}

function HtmlReport(opts) {
    this.verbose = opts.verbose;
    this.linkMapper = opts.linkMapper || standardLinkMapper;
    this.subdir = opts.subdir || '';
    this.date = Date();
    this.skipEmpty = opts.skipEmpty;
}

HtmlReport.prototype.getTemplateData = function() {
    return { datetime: this.date };
};

HtmlReport.prototype.getWriter = function(context) {
    if (!this.subdir) {
        return context.writer;
    }
    return context.writer.writerForDir(this.subdir);
};

HtmlReport.prototype.onStart = function(root, context) {
    var that = this,
        assetHeaders = {
            '.js': '/* eslint-disable */\n'
        },
        copyAssets = function(subdir, writer) {
            var srcDir = path.resolve(__dirname, 'assets', subdir);
            fs.readdirSync(srcDir).forEach(function(f) {
                var resolvedSource = path.resolve(srcDir, f),
                    resolvedDestination = '.',
                    stat = fs.statSync(resolvedSource),
                    dest;

                if (stat.isFile()) {
                    dest = resolvedDestination + '/' + f;
                    if (that.verbose) {
                        console.log('Write asset: ' + dest);
                    }
                    writer.copyFile(
                        resolvedSource,
                        dest,
                        assetHeaders[path.extname(f)]
                    );
                }
            });
        };

    ['.', 'vendor'].forEach(function(subdir) {
        copyAssets(subdir, that.getWriter(context));
    });
};

function fixPct(metrics) {
    Object.keys(emptyClasses).forEach(function(key) {
        metrics[key].pct = 0;
    });
    return metrics;
}

HtmlReport.prototype.onSummary = function(node, context) {
    var linkMapper = this.linkMapper,
        templateData = this.getTemplateData(),
        children = node.getChildren(),
        skipEmpty = this.skipEmpty,
        cw;

    fillTemplate(node, templateData, linkMapper, context);
    cw = this.getWriter(context).writeFile(linkMapper.getPath(node));
    cw.write(headerTemplate(templateData));
    cw.write(summaryTableHeader);
    children.forEach(function(child) {
        var metrics = child.getCoverageSummary(),
            isEmpty = metrics.isEmpty();
        if (skipEmpty && isEmpty) {
            return;
        }
        var reportClasses = isEmpty
                ? emptyClasses
                : {
                      statements: context.classForPercent(
                          'statements',
                          metrics.statements.pct
                      ),
                      lines: context.classForPercent(
                          'lines',
                          metrics.lines.pct
                      ),
                      functions: context.classForPercent(
                          'functions',
                          metrics.functions.pct
                      ),
                      branches: context.classForPercent(
                          'branches',
                          metrics.branches.pct
                      )
                  },
            data = {
                metrics: isEmpty ? fixPct(metrics) : metrics,
                reportClasses: reportClasses,
                file: child.getRelativeName(),
                output: linkMapper.relativePath(node, child)
            };
        cw.write(summaryLineTemplate(data) + '\n');
    });
    cw.write(summaryTableFooter);
    cw.write(footerTemplate(templateData));
    cw.close();
};

HtmlReport.prototype.onDetail = function(node, context) {
    var linkMapper = this.linkMapper,
        templateData = this.getTemplateData(),
        cw;

    fillTemplate(node, templateData, linkMapper, context);
    cw = this.getWriter(context).writeFile(linkMapper.getPath(node));
    cw.write(headerTemplate(templateData));
    cw.write('<pre><table class="coverage">\n');
    cw.write(
        detailTemplate(
            annotator.annotateSourceCode(node.getFileCoverage(), context)
        )
    );
    cw.write('</table></pre>\n');
    cw.write(footerTemplate(templateData));
    cw.close();
};

module.exports = HtmlReport;
