-- create the module's table
local genesis_v1 = {}

-- import required modules
local dict = require "scripts.app.dict"
local dump = require "scripts.app.dump"
local flash = require "scripts.app.flash"
local snes = require "scripts.app.snes"
local apperase = require "scripts.app.erase"

-- file constants

-- local functions

--dump the SNES ROM starting at the provided bank
--/ROMSEL is always low for this dump
local function dump_rom( file, rom_size_KB, debug )

	local KB_per_bank = 128	  -- A1-16 = 64K address space, 2Bytes per address
	local addr_base = 0x0000  -- control signals are manually controlled


	local num_reads = rom_size_KB / KB_per_bank
	local read_count = 0

	while ( read_count < num_reads ) do

		if debug then print( "dump ROM part ", read_count, " of ", num_reads) end

		if (read_count %8 == 0) then
			print("dumping ROM bank: ", read_count, " of ", num_reads-1)
		end

		--select desired bank
		dict.sega("SET_BANK", read_count)

		dump.dumptofile( file, KB_per_bank/2, addr_base, "GENESIS_ROM_PAGE0", false )
		dump.dumptofile( file, KB_per_bank/2, addr_base, "GENESIS_ROM_PAGE1", false )

		read_count = read_count + 1
	end

end

--Cart should be in reset state upon calling this function 
--this function processes all user requests for this specific board/mapper
local function process(process_opts, console_opts)
	local test = process_opts["test"]
	local read = process_opts["read"]
	local erase = process_opts["erase"]
	local program = process_opts["program"]
	local verify = process_opts["verify"]
	local dumpfile = process_opts["dump_filename"]
	local flashfile = process_opts["flash_filename"]
	local verifyfile = process_opts["verify_filename"]

	local rv = nil
	local file 
	local rom_size = console_opts["prg_rom_size_kb"]
	local wram_size = console_opts["wram_size_kb"]
	local mirror = console_opts["mirror"]


--initialize device i/o for SEGA
	dict.io("IO_RESET")
	dict.io("SEGA_INIT")


--test cart by reading manf/prod ID
	if test then

--		print("Testing SNES board");
--
--		--SNES detect HiROM or LoROM & RAM
--
--		--SNES detect if able to read flash ID's
--		if not rom_manf_id(true) then
--			print("ERROR unable to read flash ID")
--			return
--		end
	end


--dump the ram to file 
	if dumpram then

--		print("\nDumping SAVE RAM...")
--
--		--may have to verify /RESET is high to enable SRAM
--
--		file = assert(io.open(ramdumpfile, "wb"))
--
--		--dump cart into file
--		dump_ram(file, rambank, ram_size, snes_mapping, true)
--
--		--may disable SRAM by placing /RESET low
--
--		--close file
--		assert(file:close())
--
--		print("DONE Dumping SAVE RAM")
	end

--dump the cart to dumpfile
	if read then
		print("\nDumping SEGA ROM...")

		file = assert(io.open(dumpfile, "wb"))

		--dump cart into file
		dump_rom(file, rom_size, true)

		--close file
		assert(file:close())
		print("DONE Dumping SEGA ROM")
	end

--erase the cart
	if erase then

	--	erase_flash()
	end

--write to wram on the cart
	if writeram then

--		print("\nWritting to SAVE RAM...")
--
--		file = assert(io.open(ramwritefile, "rb"))
--
--		--flash.write_file( file, ram_size, "NOVAR", "PRGRAM", false )
--		--flash.write_file( file, ram_size, "LOROM_3VOLT", "SNESROM", false )
--		wr_ram(file, rambank, ram_size, snes_mapping, true)
--
--		--close file
--		assert(file:close())
--
--		print("DONE Writting SAVE RAM")
	end


--program flashfile to the cart
	if program then

--		--open file
--		file = assert(io.open(flashfile, "rb"))
--		--determine if auto-doubling, deinterleaving, etc, 
--		--needs done to make board compatible with rom
--
--		--flash cart
--		flash_rom(file, rom_size, snes_mapping, true)
--
--		--close file
--		assert(file:close())

	end

--verify flashfile is on the cart
	if verify then
--		print("\nPost dumping SNES ROM...")
--		--for now let's just dump the file and verify manually
--
--		file = assert(io.open(verifyfile, "wb"))
--
--		--dump cart into file
--		dump_rom(file, rom_size, true)
--
--		--close file
--		assert(file:close())
--		print("DONE Post dumping SNES ROM")
	end

	dict.io("IO_RESET")
end


-- global variables so other modules can use them


-- call functions desired to run when script is called/imported


-- functions other modules are able to call
genesis_v1.process = process

-- return the module's table
return genesis_v1