#!/usr/bin/env ruby

require "json"
require "open-uri"

FEED_URL = "https://bookmarks.davideisinger.com/u:dce.json"

# Mutable state
index   = (ARGV.pop || 1).to_i
content = []
links   = []
refs    = []

# Helpers
archive_url = ->(url) { `bin/archive "#{url}"`.sub("references:\n", "") }

link_def = ->(i, url) { "[#{i}]: #{url}" }

item_content = ->(item, i) do
  title = "[#{item["title"]}][#{i}]"
  title += " ([via][#{i + 1}])" if item["referrer"]

  desc = (item["description"] || "").to_s.tr("\n", " ").squeeze(" ")

  <<~OUT
    * #{title}

      > #{desc}
  OUT
end

add_url = ->(url) do
  links << link_def[index, url]
  refs  << archive_url[url]
  index += 1
end

add_item = ->(item) do
  content << item_content[item, index]
  add_url[item["url"]]
  add_url[item["referrer"]] if item["referrer"]
end

result = -> do
  <<~OUT
    ---
    #{content.join("\n")}
    #{links.join("\n")}
    ---
    references:
    #{refs.join}
  OUT
end

process_item = ->(item) do
  puts <<~OUT

    #{item_content[item, index]}
    #{link_def[index, item["url"]]}

  OUT

  print "Include? (y/n/a): "

  case gets.chomp
  when "y"
    add_item[item]
  when "n"
    nil
  when "a"
    puts result.call
    abort
  else
    process_item[item]
  end
end

URI.parse(FEED_URL).open do |json|
  feed = JSON.parse(json.read)

  feed.each do |item|
    process_item[item]
  end

  puts result.call
end