require "benchmark"
require "./utilities.cr"
require "./db-cars.cr"

# List of environment variables and default values:
# ENV["CARNAME"]          rescue "Corvet-#{(db_size/2).to_i}"
# ENV["CARCOLOR"]         rescue "red"
# ENV["CARKEYWORD"]       rescue "spacious"
# ENV["DBSIZE"]           rescue 40_000
# ENV["DBSIZE_START"]     rescue 5_000
# ENV["DBSIZE_INCREMENT"] rescue 1_000
# ENV["REPORT_DIR"]       rescue "results"
# ENV["NBRUN"]            rescue 100

class DODB::Storage(V)
	def empty_db
		while pop
		end
	end
end

class Context
	class_property report_dir = "results"
end

def report(storage, nb_run, name, &block)
	durations = run_n_times nb_run, &block
	File.open("#{Context.report_dir}/#{name}", "w") do |file|
		durations.each do |d|
			file.puts d
		end
	end
	avr = durations.reduce { |a, b| a + b }  / nb_run
	puts "#{name}: #{avr}"
	avr
end

def prepare_env(storage, db_size, name, s_index, s_partition, s_tags, &)
	STDOUT.write "add #{db_size} values to #{name}\r".to_slice
	add_cars storage, db_size
	STDOUT.write "                                      \r".to_slice

	yield storage, name, s_index, s_partition, s_tags

	storage.rm_storage_dir
end

def batch(db_size, nb_run)
	cars_ram      = DODB::RAMOnlySpecDataBase(Car).new
	cars_cached   = DODB::CachedSpecDataBase(Car).new
	cars_semi     = DODB::SpecDataBase(Car).new "-semi"
	cars_uncached = DODB::SpecDataBase(Car).new

	ram_Sby_name,      ram_Sby_color,      ram_Sby_keywords      = ram_indexes      cars_ram
	cached_Sby_name,   cached_Sby_color,   cached_Sby_keywords   = cached_indexes   cars_cached
	semi_Sby_name,     semi_Sby_color,     semi_Sby_keywords     = cached_indexes   cars_semi
	uncached_Sby_name, uncached_Sby_color, uncached_Sby_keywords = uncached_indexes cars_uncached

	car_name_to_search    = ENV["CARNAME"]     rescue "Corvet-#{(db_size/2).to_i}"
	car_color_to_search   = ENV["CARCOLOR"]    rescue "red"
	car_keyword_to_search = ENV["CARKEYWORD"]  rescue "spacious"

	puts ""
	puts "NEW BATCH: db-size #{db_size}"
	puts ""
	puts "search by index '#{car_name_to_search}', partition '#{car_color_to_search}', tag '#{car_keyword_to_search}'"

	fn = ->(storage : DODB::Storage(Car),
			name : String,
			search_name : DODB::Index(Car),
			search_color : DODB::Partition(Car),
			search_keywords : DODB::Tags(Car)) {
		report(storage, nb_run, "#{name}_#{db_size}_index") do
			corvet = search_name.get car_name_to_search
		end
		report(storage, nb_run, "#{name}_#{db_size}_partitions") do
			corvet = search_color.get car_color_to_search
		end
		report(storage, nb_run, "#{name}_#{db_size}_tags") do
			corvet = search_keywords.get car_keyword_to_search
		end
		puts ""
	}

	prepare_env cars_ram,      db_size, "ram",      ram_Sby_name, ram_Sby_color, ram_Sby_keywords, &fn
	prepare_env cars_cached,   db_size, "cached",   cached_Sby_name, cached_Sby_color, cached_Sby_keywords, &fn
	prepare_env cars_semi,     db_size, "semi",     semi_Sby_name, semi_Sby_color, semi_Sby_keywords, &fn
	prepare_env cars_uncached, db_size, "uncached", uncached_Sby_name, uncached_Sby_color, uncached_Sby_keywords, &fn
end

def perform_add(storage : DODB::Storage(Car), nb_run)
	corvet0 = Car.new "Corvet", "red", [ "shiny", "impressive", "fast", "elegant" ]
	i = 0
	perform_benchmark_average nb_run, do
		corvet = corvet0.clone
		corvet.name = "Corvet-#{i}"
		storage << corvet
		i += 1
	end
end

def batch_add(nb_run)
	cars_ram      = DODB::RAMOnlySpecDataBase(Car).new
	cars_cached   = DODB::CachedSpecDataBase(Car).new
	cars_semi     = DODB::SpecDataBase(Car).new "-semi"
	cars_uncached = DODB::SpecDataBase(Car).new

	ram_indexes      cars_ram
	cached_indexes   cars_cached
	cached_indexes   cars_semi
	uncached_indexes cars_uncached

	avr = perform_add(cars_ram, nb_run)
	puts "(ram db and indexes) add a value (average on #{nb_run} tries): #{avr}"

	avr = perform_add(cars_cached, nb_run)
	puts "(cached db and indexes) add a value (average on #{nb_run} tries): #{avr}"

	avr = perform_add(cars_semi, nb_run)
	puts "(uncached db but cached indexes) add a value (average on #{nb_run} tries): #{avr}"

	avr = perform_add(cars_uncached, nb_run)
	puts "(uncached db and indexes) add a value (average on #{nb_run} tries): #{avr}"

	cars_ram.rm_storage_dir
	cars_cached.rm_storage_dir
	cars_semi.rm_storage_dir
	cars_uncached.rm_storage_dir
end

ENV["REPORT_DIR"]?.try do |report_dir|
	Context.report_dir = report_dir
end
Dir.mkdir_p Context.report_dir

nb_run = ENV["NBRUN"].to_i rescue 100
db_size_max = ENV["DBSIZE"].to_i rescue 40_000
current_size = ENV["DBSIZE_START"].to_i rescue 5_000
size_increment = ENV["DBSIZE_INCREMENT"].to_i rescue 1_000

# ENV["DBSIZE"]           rescue 40_000
# ENV["DBSIZE_START"]     rescue 5_000
# ENV["DBSIZE_INCREMENT"] rescue 1_000
# ENV["REPORT_DIR"]       rescue "results"
# ENV["NBRUN"]            rescue 100

pp! nb_run
pp! db_size_max
pp! current_size
pp! size_increment

while current_size <= db_size_max
	batch current_size, nb_run
	current_size += size_increment
end
batch_add nb_run