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#!/usr/bin/env node

var optimist = require('optimist'),
    commandLineOptions = optimist
        .usage('$0 --root <inputRootDirectory> --outroot <dir> [options] <htmlFile(s)>')
        .options('h', {
            alias: 'help',
            describe: 'Show this help',
            type: 'boolean',
            default: false
        })
        .options('root', {
            describe: 'Path to your web root',
            type: 'string',
            demand: true
        })
        .options('outroot', {
            describe: 'Path to the output folder. Will be generated if non-existing',
            type: 'string',
            demand: true
        })
        .options('cdnroot', {
            describe: 'URI root where the static assets will be deployed. Must be either an absolute or a protocol-relative url.',
            type: 'string',
            demand: false
        })
        .options('cdnoutroot', {
            describe: 'Path to the CDN output folder. Will be generated if non-existing',
            type: 'string',
            demand: false
        })
        .options('exclude', {
            describe: 'Url pattern to exclude from the build. Supports * wildcards. You can create multiple of these: --exclude *.php --exclude http://example.com/*.gif',
            type: 'string',
            demand: false
        })
        .options('label', {
            describe: 'Registers labels as custom protocols for path resolving. You can create multiple of these: --label <labelName>=<dir> --label <otherLabelName>=<otherDir>',
            type: 'string',
            demand: false
        })
        .options('parentdir', {
            describe: 'If an unknown label (scheme) is found, look for at parent dir of that name before failing (breaks custom protocols)',
            type: 'boolean',
            demand: false
        })
        .options('locale', {
            describe: 'Comma-separated list of locales to build seperate versions for',
            type: 'string',
            demand: false
        })
        .options('striponebootstrapper', {
            describe: 'Removes the production part of the oneBootstrapper script that buildDevelopment injects to support localization (defaults to true if --locale is specified, false otherwise)',
            type: 'boolean'
        })
        .options('defaultlocale', {
            describe: 'The locale of the default value in one.tr statements and tags with a data-i18n attribute',
            type: 'string',
            default: 'en'
        })
        .options('optimizepngs', {
            describe: 'Tries optimal palette reduction, removes ancillary chunks and tries for better compression',
            type: 'boolean',
            default: false
        })
        .options('inlinesize', {
            describe: 'Inline CSS backgrounds below this threshold as data-uris',
            default: 8192
        })
        .options('deferscripts', {
            describe: 'Sets the "defer" attribute on all script tags',
            type: 'boolean',
            default: false
        })
        .options('asyncscripts', {
            describe: 'Sets the "async" attribute on all script tags',
            type: 'boolean',
            default: false
        })
        .options('nocompress', {
            describe: 'Prettifies HTML, CSS and Javascript for easier debugging',
            type: 'boolean',
            default: false
        })
        .options('mangletoplevel', {
            describe: 'Wraps your javascript code in a function literal that pulls global variables into local variables for better minification. WARNING: This may break your JS',
            type: 'boolean',
            default: false
        })
        .options('manifest', {
            describe: 'Generates an appcache manifest file with all static assets included',
            type: 'boolean',
            default: false
        })
        .options('less', {
            describe: 'Translates .less files to CSS',
            type: 'boolean',
            default: false
        })
        .options('version', {
            describe: 'Adds or updates <meta http-equiv="Content-Version" content="..."> to the specified value. Use {0} to refer to the current value, eg. --version {0}/production or --version `git describe --long --tags --always --dirty 2>/dev/null || echo unknown`',
            type: 'string'
        })
        .check(function (argv) {
            return typeof argv.inlinesize === 'number';
        })
        .demand(1)
        .wrap(72)
        .argv;

if (commandLineOptions.h) {
    optimist.showHelp();
    process.exit(1);
}

var _ = require('underscore'),
    AssetGraph = require('assetgraph'),
    oneBootstrapper = require('../lib/util/oneBootstrapper'),
    query = AssetGraph.query,
    urlTools = require('assetgraph/lib/util/urlTools'),
    outroot = urlTools.fsDirToFileUrl(commandLineOptions.outroot),
    cdnroot = commandLineOptions.cdnroot && urlTools.ensureTrailingSlash(commandLineOptions.cdnroot),
    cdnoutroot = commandLineOptions.cdnoutroot && urlTools.fsDirToFileUrl(commandLineOptions.cdnoutroot),
    localeIds = commandLineOptions.locale && _.flatten(_.flatten([commandLineOptions.locale]).map(function (localeId) {return localeId.split(",");})),
    stripOneBootstrapper = commandLineOptions.striponebootstrapper || !commandLineOptions.locale,
    blacklistUrlRegExp = /^$/,
    cdnrootIsProtocolRelative = false;

if (/^\/\//.test(cdnroot)) {
    cdnrootIsProtocolRelative = true;
    cdnroot = 'http:' + cdnroot;
}

if (commandLineOptions.exclude) {
    blacklistUrlRegExp = new RegExp('(?:' +
        _.flatten(_.flatten([commandLineOptions.exclude])).map(function (wildcard) {
            return wildcard.replace(/[\.\+\{\}\[\]\(\)\?\^\$]/g, '\\$&').replace(/\*/g, '.*?');
        }).join('|') +
        ')');
}

require('../lib/registerTransforms');

new AssetGraph({root: commandLineOptions.root})
    .on('afterTransform', function (transform, elapsedTime) {
        console.log((elapsedTime / 1000).toFixed(3) + " secs: " + transform.name);
    })
    .on('error', function (err) {
        console.error(err.stack);
        process.exit(1);
    })
    .registerRequireJsConfig()
    .registerLabelsAsCustomProtocols(commandLineOptions.label, {installFindParentDirectoryAsDefault: commandLineOptions.parentdir})
    .loadAssets(commandLineOptions._.map(urlTools.fsFilePathToFileUrl))
    .populate({
        followRelations: query.or({to: {type: 'I18n'}},
                                  {type: query.not(['JavaScriptOneInclude', 'JavaScriptExtJsRequire', 'JavaScriptCommonJsRequire', 'HtmlAnchor']), to: query.and({url: query.not(/^https?:/)}, {url: query.not(blacklistUrlRegExp)})})
    })
    .if(stripOneBootstrapper)
        .stripOneBootstrapper()
    .else()
        .stripDevelopmentModeFromOneBootstrapper({type: 'Html', isInitial: true})
        .if(cdnroot)
            .queue(function addCdnRootToOneBootstrapper(assetGraph) {
                oneBootstrapper.findOneBootstrappersInGraph(assetGraph).forEach(function (javaScript) {
                    javaScript.parseTree[1].splice(1, 0, ['stat', ['assign', true, ['dot', ['name', 'one'], 'cdnRoot'], ['string', cdnroot]]]);
                });
            })
        .endif()
    .endif()
    .if(commandLineOptions.version)
        .addContentVersionMetaElement({type: 'Html'}, commandLineOptions.version, true)
    .endif()
    .if(commandLineOptions.less)
        // Replace Less assets with their Css counterparts:
        .compileLessToCss({type: 'Less'})

        // Kill in-browser less compiler and remove its incoming relations:
        .removeAssets({url: /\/less(?:-\d+\.\d+\.\d+)?(?:\.min)?\.js$/}, true)

        // Find and populate CssImage relations from the compiled Less assets:
        .populate({from: {type: 'Css'}})
    .endif()
    .removeRelations({type: 'JavaScriptOneInclude', to: {type: ['Css', 'JavaScript']}}, {detach: true, unresolved: true})
    .convertCssImportsToHtmlStyles()
    .removeAssets({isEmpty: true, type: ['Css', 'JavaScript']}, true)
    .externalizeRelations({from: {type: query.not('Htc')}, type: ['HtmlStyle', 'HtmlScript'], node: function (node) {return !node.hasAttribute('nobundle');}})
    .mergeIdenticalAssets(query.or({isImage: true}, {type: ['JavaScript', 'Css']}))
    .spriteBackgroundImages()
    .postProcessCssImages()
    .if(commandLineOptions.optimizepngs)
        .optimizePngs()
    .endif()
    .bundleRequireJs({type: 'Html'})
    .bundleRelations({type: 'HtmlStyle', to: {type: 'Css'}, node: function (node) {return !node.hasAttribute('nobundle') && !node.hasAttribute('localize');}})
    .bundleRelations({type: 'HtmlScript', to: {type: 'JavaScript'}, node: function (node) {return !node.hasAttribute('nobundle') && !node.hasAttribute('localize');}})
    .inlineCssImagesWithLegacyFallback({type: 'Html', isInline: false}, commandLineOptions.inlinesize)
    .if(commandLineOptions.mangletoplevel)
        .pullGlobalsIntoVariables({type: 'JavaScript'})
    .endif()
    .if(!commandLineOptions.nocompress)
        .compressJavaScript({type: 'JavaScript'}, 'uglifyJs', {toplevel: commandLineOptions.mangletoplevel})
    .endif()
    .if(localeIds)
        .cloneForEachLocale({type: 'Html', isInitial: true}, {localeIds: localeIds, defaultLocaleId: commandLineOptions.defaultlocale})
        .runJavaScriptConditionalBlocks({isInitial: true}, 'localize', true)
        .bundleRelations({type: 'HtmlScript', to: {type: 'JavaScript'}, node: function (node) {return !node.hasAttribute('nobundle');}})
    .endif()
    .removeNobundleAttribute({type: ['HtmlScript', 'HtmlStyle']})
    .removeAssets({type: 'I18n'}, true)
    .minifyAssets()
    .inlineRelations({
        type: ['HtmlStyle', 'HtmlScript'],
        from: {isInline: false}, // Excludes relations occurring in conditional comments
        to: function (asset) {return asset.isAsset && asset.rawSrc.length < 4096;}
    })
    .if(commandLineOptions.manifest)
        .addCacheManifest({isInitial: true})
    .endif()
    .if(commandLineOptions.nocompress)
        .prettyPrintAssets({type: ['Html', 'JavaScript', 'Css']})
    .endif()
    .setAsyncOrDeferOnHtmlScripts({to: {isInline: false, url: /^file:/}}, commandLineOptions.asyncscripts, commandLineOptions.deferscripts)
    .omitGetStaticUrlFunctionCall()
    .inlineRelations({type: 'JavaScriptOneGetText'})
    .moveAssetsInOrder({isInitial: query.not(true), type: query.not('CacheManifest')}, function (asset, assetGraph) {
        var targetUrl = "/static/";
        // Conservatively assume that all one.getStaticUrl relations pointing at non-images are intended to be fetched via XHR
        // and thus cannot be put on a CDN because of same origin restrictions:
        if (cdnroot && (asset.isImage || assetGraph.findRelations({to: asset, type: 'StaticUrlMapEntry'}).length === 0)) {
            targetUrl = cdnroot;
            if (cdnrootIsProtocolRelative) {
                assetGraph.findRelations({to: asset}).forEach(function (incomingRelation) {
                    incomingRelation.hrefType = 'protocolRelative';
                });
            }
        }
        return targetUrl + asset.md5Hex.substr(0, 10) + asset.extension + asset.url.replace(/^[^#\?]*(?:)/, ''); // Preserve query string and fragment identifier
    })
    .writeAssetsToDisc({url: /^file:/}, outroot)
    .if(cdnroot)
        .writeAssetsToDisc({url: query.createPrefixMatcher(cdnroot)}, cdnoutroot || outroot, cdnroot)
    .endif()
    .writeStatsToStderr()
    .run();
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