class Cache

# File lib/utils/cache.rb, line 5
def initialize(path:)
        @config = {
                :path => path
        }

        @size = File.readable?(@config[:path]) ? JSON.parse(File.read(@config[:path]).to_s)["data"].count : 0

        @last_fetched = File.readable?(@config[:path]) ? JSON.parse(File.read(@config[:path]).to_s)["last_fetched"] : nil
end

# File lib/utils/cache.rb, line 43
def add_entries_to_file(data:)
        cache = self.read_from_file
        new_entries_count = 0

        # If an entry doesn't exist in the cache, we add it.
        data.each do |new_entry|
                unless cache["data"].find_index { |cache_entry| cache_entry["id"] == new_entry["id"] }
                        cache["data"].push (new_entry.filter { |key| key != "content" })
                        new_entries_count += 1
                end
        end

        self.size = cache["data"].count
        self.last_fetched = Date.today
        self.write_to_file data: cache

        puts "#{new_entries_count} new entries were written to cache."
end

# File lib/utils/cache.rb, line 15
def read_from_file
        if File.readable? @config[:path]
                JSON.parse(File.read(@config[:path]).to_s)
        else
                return {
                        "size" => 0,
                        "last_fetched" => nil,
                        "data" => Array.new
                }
        end
end

# File lib/utils/cache.rb, line 27
def remove_entries_from_file(ids:)
        cache = self.read_from_file

        ids.each do |id|
                # TODO We could implement a search algo like binary search for performance here
                cache["data"].each do |cached_entry|
                        if cached_entry["id"].to_i == id.to_i
                                cache["data"].delete cached_entry
                        end
                end
        end

        self.size = cache["data"].count
        self.write_to_file data: cache
end

# File lib/utils/cache.rb, line 62
def write_to_file(data:)
        data["size"] = @size
        data["last_fetched"] = @last_fetched
        File.write(@config[:path], data.to_json)
end