# coding: utf-8
load 'pandoc.rb'
require 'erb'
require 'date'
require 'set'

$license_urls = {
	"CC BY-SA-3.0" => 'https://creativecommons.org/licenses/by-sa/3.0/',
	'WTFPL-2' => "http://www.wtfpl.net/txt/copying/",
}
$person_uris = {
	"Luke Shumaker" => "https://lukeshu.com/",
	"Andrew Murrell" => "https://andrewdm.me/",
}
$person_emails = {
	"Luke Shumaker" => "lukeshu@parabola.nu",
	"Andrew Murrell" => "ImFromNASA@gmail.com",
}

$tag_names = {
	"DM" => "DMing Resource",
	"ES" => "Essay",
	"FF" => "Flash Fiction",
	"HB" => "Homebrew",
	"SS" => "Short Story",
	"WP" => "WIP",
}

class Tag
	def initialize(abbr)
		@abbr = abbr
	end
	def abbr
		@abbr
	end
	def name
		$tag_names[@abbr]
	end
	def html
		return "<a class=\"tag #{abbr}\" href=\"/tags/#{abbr}.html\">#{name}</a>"
	end
end

class Person
	def initialize(name)
		@name = name
	end
	def name
		@name
	end
	def uri
		$person_uris[@name]
	end
	def email
		$person_emails[@name]
	end
	def html
		if not email.nil?
			return "<a href=\"mailto:#{email}\">#{name}</a>"
		elsif not uri.nil?
			return "<a href=\"#{uri}\">#{name}</a>"
		else
			return @name
		end
	end
	def atom
		ret = ""
		ret += "<name>#{name}</name>" unless name.nil?
		ret += "<uri>#{uri}</uri>" unless uri.nil?
		ret += "<email>#{email}</email>" unless email.nil?
	end
end

class License
	def initialize(name)
		@name = name
	end
	def name
		@name
	end
	def url
		$license_urls[@name]
	end
	def html
		"<a href=\"#{url}\">#{name}</a>"
	end
end

class Page
	def initialize(infile)
		@infile = infile
	end

	def infile ; @infile                      ; end
	def input  ; @input ||= File.read(infile) ; end
	def pandoc
		if @pandoc.nil?
			types = {
				'md' => 'markdown'
			}

			ext = File.extname(infile).gsub(/^[.]/, '')
			type = types[ext] || ext
			@pandoc = Pandoc::load(type, input)

			if @pandoc['pandoc_format']
				@pandoc = Pandoc::load(@pandoc['pandoc_format'], input)
			end
		end
		@pandoc
	end

	def title   ; @title   ||=             pandoc['title']   || input.split("\n",2).first ; end
	def showtitle ; @showtitle ||= ! pandoc['title'].nil?                                 ; end

	def author  ; @author  ||= Person.new( pandoc['author']  || "Andrew Murrell")         ; end
	def license ; @license ||= License.new(pandoc['license'] || "CC BY-SA-3.0")           ; end
	def slug    ; @slug    ||= infile.sub(/\..*$/,'').sub(/^.*\//,'')                     ; end
	def content ; @content ||= pandoc.to('html5 '+(pandoc['pandoc_flags']||''))           ; end
	def head    ; @head    ||= pandoc['html_head_extra']                                  ; end
	def tags    ; @tags    ||= (pandoc['tags'] || '').split.map{|tag|Tag.new(tag)}        ; end

	def published
		if @published.nil?
			raw = pandoc['published']
			@published = Date.parse(raw) unless raw.nil?
		end
		if @published.nil?
			raw = `git log -n1 --reverse --format='%cI' -- #{infile}`
			@published = DateTime.iso8601(raw) unless raw.empty?
			if !updated.nil? && updated < @published
				@published = updated
			end
		end
		@published
	end

	def updated
		if @updated.nil?
			raw = pandoc['updated']
			@updated = Date.parse(raw) unless raw.nil?
		end
		if @updated.nil?
			raw = `git log -n1 --format='%cI' -- #{infile}`
			@updated = DateTime.iso8601(raw) unless raw.empty?
		end
		@updated
	end

	def rights
		years = `git log --date=format:'%Y' --format='%cd' -- .config/login.sh`.split('\n').map{|s|s.to_i}
		years.unshift(published.year) unless published.nil?
		years.unshift(updated.year) unless updated.nil?
		years = Set[*years]
		# TODO: simplify year spans
		@rights ||= "<p>The content of this page is Copyright © #{years.sort.join(', ')} #{author.html}.</p>\n" +
					"<p>This page is licensed under the #{license.html} license.</p>"
	end

	def src
		@src ||= infile.sub(/^(src|out)\//, '/')
	end

	def url
		if @url.nil?
			u = src.sub(/\.[^\/.]*$/, '.html').sub(/\/index[.]html$/, '')
			@url = u == '' ? '/' : u
		end
		@url
	end

	def breadcrumbs
		if @breadcrumbs.nil?
			bc = []
			u = url
			while u != "/"
				bc.unshift("<a href=\"#{u}\">#{File.basename(u, File.extname(u))}</a>")
				u = File.dirname(u)
			end
			bc.unshift("<a href=\"/\">Andrew D. Murrell</a>")
			@breadcrumbs = bc.join(' » ')
		end
		@breadcrumbs
	end
end

def html_escape(html)
	html
		.gsub('&', '&amp;')
		.gsub('>', '&gt;')
		.gsub('<', '&lt;')
end