var extname = require('path').extname;
var Metalsmith = require('metalsmith');
var drafts = require('metalsmith-drafts');
var markdown = require('metalsmith-markdown');
var layouts = require('metalsmith-layouts');
var inplace = require('metalsmith-in-place');
var uglify = require('metalsmith-uglify');
var rename = require('metalsmith-rename');
var metadata = require('metalsmith-metadata');
var fingerprint = require('metalsmith-fingerprint');
var branch = require('metalsmith-branch');
var assets = require('metalsmith-assets');
var paths = require('metalsmith-paths');
var linkchecker = require('metalsmith-broken-link-checker');
var rootpath = require('metalsmith-rootpath');
var collections = require('metalsmith-collections');
var filenamedate = require('metalsmith-date-in-filename');
var registerHelpers = require('metalsmith-register-helpers');
var match = require('multimatch');

/**
 * Helpers
 */

// generate metadata for lab membership (used in buildPubs, buildGrants, and /people/index.md)
var buildMembers = require('./stages/build-members.js')
// generate metadata for publications (used in /papers/index.md)
var buildPubs = require('./stages/build-pubs.js');
// generate metadata for grants (used in /grants/index.md)
var buildGrants = require('./stages/build-grants.js');
// use mathjax to render inline-latex
var renderTeX = require('./stages/render-tex.js');

/**
 * Build.
 */

var metalsmith = Metalsmith(__dirname)
  .source('./src')
  .destination('./site')
// Disable posting of drafts
  .use(drafts())
  .use(registerHelpers({
    directory: "./helpers"
  }))
// Generate Cache-Busted CSS files
  .use(fingerprint({ 
    pattern: 'css/*.css' 
  }))
// Load metadata: CV, Lab Members/Affiliates, and Pubs
// Required for buildPubs
  .use(metadata({
    okennedy: "metadata/okennedy.json",
    odinLab: "metadata/lab.json",
    altPubs: "metadata/publications.json",
  }))
// Helper Stage: Render Publication/Grant Details (required for inline rendering)
  .use(buildMembers())
  .use(buildPubs())
  .use(buildGrants())
// Extract Path to Root (required for inline rendering)
  .use(rootpath())
// Extract Dates from Filenames (required for inline rendering)
  .use(filenamedate(false))
// Render Page-Specific Handlebars
  .use(inplace({
      engine: "handlebars"
  }))
// Render Markdown
  .use(markdown({
    pattern: "**/*.md"
  }))
// Load Path Information (Must come After Markdown Rendering)
  .use(paths({
    property: "paths"
  }))
// Group News Article Collections
  .use(collections({
    news: {
      pattern: 'news/*.html',
      sortBy: 'date',
      reverse: true,
      limit: 5
    },
    rants: {
      pattern: 'rants/*.html',
      sortBy: 'date',
      reverse: true,
      limit: 3
    }
  }))
// Render News Article Headers
  .use(branch('rants/**/*.html')
    .use(layouts({
      engine: "handlebars",
      default: "article.hbs"
    }))
  )
// Render Lab Member Metadata
  .use(branch(['people/*.html', '!**/index.html'])
    .use(layouts({
      engine: "handlebars",
      default: "member.hbs"
    }))
  )
// Final Render Pass
  .use(branch('news/**/*.html')
    .use(layouts({
      engine: "handlebars",
      default: "article.hbs"
    }))
  )
// Render HTML
  .use(branch('**/*.html')
    // Render LaTeX inlined into the HTML
    .use(renderTeX())
    // Assign a mimir-specific layout to the mimir subdirectory
    .use(branch('research/mimir/*.html')
      .use(function(files, smith, done) { 
        for(i in files){ files[i].layout = 'mimir.hbs' }
        done();
      })
    )
    // Render outer layouts
    .use(layouts({ 
    	engine: "handlebars", 
    	default: "default.hbs",
      directory: "layouts",
      partials: "partials"
    }))
  )
// Validate
  .use(linkchecker({
    allowRegex: /^(\/resources|\/slides)/,
    allowRedirect: true
  }))
// Compress
  .use(uglify())
// Compile
  .build(function(err){
    if (err) throw err;
  });