const toml = require('@iarna/toml')
const markdown = require("markdown-it")
const eleventyNavigation = require('@11ty/eleventy-navigation')
const eleventyRss = require('@11ty/eleventy-plugin-rss')

const MD_OPTIONS = { 
	html: true,
};

filter_local_date = function(date) {
	// yyyy-MM-dd
	return date.getFullYear() + '-'
		+ (date.getMonth() + 1).toString().padStart(2, '0') + '-'
		+ date.getDate().toString().padStart(2, '0')
}

filter_rfc3339_datetime = function(date) {
	// yyyy-MM-dd HH:mm:ssXXX
	date.setSeconds(0, 0)
	return date.toISOString().replace('T', ' ');
}


module.exports = function(eleventyConfig) {
	eleventyConfig.setLibrary('md', markdown(MD_OPTIONS));

	eleventyConfig.addPlugin(eleventyNavigation)
	eleventyConfig.addPlugin(eleventyRss)

	eleventyConfig.addPassthroughCopy('./css/')
	eleventyConfig.addPassthroughCopy('./img/')
	eleventyConfig.addPassthroughCopy('./files/')

	eleventyConfig.addFilter('local_date', filter_local_date)
	eleventyConfig.addFilter('rfc3339_datetime', filter_rfc3339_datetime)
	eleventyConfig.addFilter('md', str => {
		return markdown(MD_OPTIONS).render(str);
	})

	eleventyConfig.setFrontMatterParsingOptions({
		engines: {
			toml: toml.parse.bind(toml)
		},
		language: 'toml',
		excerpt: true
	})

	// skip drafts
	eleventyConfig.addGlobalData('eleventyComputed.permalink', function() { return (data) => {
		return data.draft && !process.env.BUILD_DRAFTS ? false : data.permalink
	}})
	eleventyConfig.addGlobalData('eleventyComputed.eleventyExcludeFromCollections', function() { return (data) => {
		return data.draft && !process.env.BUILD_DRAFTS ? false : data.eleventyExcludeFromCollections
	}})
	eleventyConfig.on('eleventy.before', ({runMode}) => {
		if(runMode === 'serve' || runMode === 'watch') {
			process.env.BUILD_DRAFTS = true
		}
	})

	return {
		dir: {
			input: 'src',
			includes: '../_includes',
			data: '../_data',
			output: '_site'
		}
	}
}