-- create the module's table
local v3 = {}

-- 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"

-- file constants

-- local functions
local function prgm_mode(debug)
	if debug then print("going to program mode, swim:", snes_swimcart) end
	if snes_swimcart then
		print("ERROR cart got set to swim mode somehow!!!")
--		swim.snes_v3_prgm(debug)
	else
		dict.pinport("CTL_SET_LO", "SNES_RST")
	end
end

local function play_mode(debug)
	if debug then print("going to play mode, swim:", snes_swimcart) end
	if snes_swimcart then
--		swim.snes_v3_play(debug)
		print("ERROR cart got set to swim mode somehow!!!")
	else
		dict.pinport("CTL_SET_HI", "SNES_RST")
	end
end


--local function wr_flash_byte(addr, value, debug)

--base is the actual NES CPU address, not the rom offset (ie $FFF0, not $7FF0)
--local function wr_bank_table(base, entries)
--Action53 not susceptible to bus conflicts, no banktable needed



-- Desc: attempt to read flash rom ID 
-- Pre: snes_init() been called to setup i/o
-- Post:Address left on bus memories disabled
-- Rtn: true if flash ID found
local function read_flashID( debug )

	local rv
	--enter software mode A11 is highest address bit that needs to be valid
	--datasheet not exactly explicit, A11 might not need to be valid
	--part has A-1 (negative 1) since it's in byte mode, meaning the part's A11 is actually A12
	--WR $AAA:AA $555:55 $AAA:AA
	dict.snes("SNES_SET_BANK", 0x00)

	--put cart in program mode
	--v3.0 boards don't use EXP0 for program mode, must use SWIM via CIC
--	prgm_mode()

	dict.snes("SNES_ROM_WR", 0x8AAA, 0xAA)
	dict.snes("SNES_ROM_WR", 0x8555, 0x55)
	dict.snes("SNES_ROM_WR", 0x8AAA, 0x90)

	--exit program mode
--	play_mode()

	--read manf ID
	local manf_id = dict.snes("SNES_ROM_RD", 0x8000)
	if debug then print("attempted read SNES ROM manf ID:", string.format("%X", manf_id)) end

	--read prod ID
	local prod_id = dict.snes("SNES_ROM_RD", 0x8002)
	if debug then print("attempted read SNES ROM prod ID:", string.format("%X", prod_id)) end

	local density_id = dict.snes("SNES_ROM_RD", 0x801C)
	if debug then print("attempted read SNES density ID: ", string.format("%X", density_id)) end

	local boot_sect = dict.snes("SNES_ROM_RD", 0x801E)
	if debug then print("attempted read SNES boot sect ID:", string.format("%X", boot_sect)) end

	--put cart in program mode
--	prgm_mode()

	--exit software
	dict.snes("SNES_ROM_WR", 0x0000, 0xF0)

	--exit program mode
--	play_mode()

	--return true if detected flash chip
	if (manf_id == 0x01 and prod_id == 0x49) then
		print("2MB flash detected")
		return true
	elseif (manf_id == 0x01 and prod_id == 0x7E) then
		print("4-8MB flash detected")
		return true
	else
		return false
	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( test, read, erase, program, verify, dumpfile, flashfile, verifyfile)

	local rv = nil
	local file 


--initialize device i/o for SNES
	dict.io("IO_RESET")
	dict.io("SNES_INIT")

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

		--SNES detect HiROM or LoROM 
		--nes.detect_mapper_mirroring(true)
		local snes_mapping = "LOROM"
		--SNES detect if there's save ram and size

		--SNES detect if able to read flash ID's
		if not read_flashID(true) then
			print("ERROR unable to read flash ID")
			return
		end

		--quick lame check to see if chip erased
		--[[
		if snes.read_reset_vector(0, true) ~= 0xFFFF then
			erase.erase_snes( false )
		end
		if snes.read_reset_vector( 1, true) ~= 0xFFFF then
			erase.erase_snes( false )
		end
		if snes.read_reset_vector( 20, true) ~= 0xFFFF then
			erase.erase_snes( false )
		end
		if snes.read_reset_vector( 63, true) ~= 0xFFFF then
			erase.erase_snes( false )
		end
		--]]

	end

--dump the cart to dumpfile
	if read then
		--initialize the mapper for dumping
		init_mapper(debug)

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

		--TODO find bank table to avoid bus conflicts!
		--dump cart into file
		dump.dumptofile( file, 512, "LOROM", "SNESROM", true )

		--close file
		assert(file:close())
	end

--erase the cart
	if erase then

		print("\nerasing tsop takes ~30sec");

		local rv = nil

		--WR $AAA:AA $555:55 $AAA:AA
		dict.snes("SNES_SET_BANK", 0x00)

		--put cart in program mode
--		snes.prgm_mode()

		dict.snes("SNES_ROM_WR", 0x8AAA, 0xAA)
		dict.snes("SNES_ROM_WR", 0x8555, 0x55)
		dict.snes("SNES_ROM_WR", 0x8AAA, 0x80)
		dict.snes("SNES_ROM_WR", 0x8AAA, 0xAA)
		dict.snes("SNES_ROM_WR", 0x8555, 0x55)
		dict.snes("SNES_ROM_WR", 0x8AAA, 0x10)

		--exit program mode
--		snes.play_mode()

		rv = dict.snes("SNES_ROM_RD", 0x8000)

		local i = 0

		while ( rv ~= 0xFF ) do
			rv = dict.snes("SNES_ROM_RD", 0x8000)
			i = i + 1
--			if debug then print(" ", i,":", string.format("%x",rv)) end
		end
		print(i, "naks, done erasing snes.");

		--put cart in program mode
--		swim.start()
--		snes.prgm_mode()

		--reset flash
		dict.snes("SNES_ROM_WR", 0x8000, 0xF0)

		--return to PLAY mode
--		print("erase play")
--		snes.play_mode()
--		print("erase play")



	end


--program flashfile to the cart
	if program then

		--initialize the mapper for dumping
		init_mapper(debug)

		--open file
		file = assert(io.open(flashfile, "rb"))
		--determine if auto-doubling, deinterleaving, etc, 
		--needs done to make board compatible with rom

		--not susceptible to bus conflicts

		--flash cart
		flash.write_file( file, 512, "LOROM", "SNESROM", true )
		--close file
		assert(file:close())

	end

--verify flashfile is on the cart
	if verify then
		--for now let's just dump the file and verify manually

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

		--dump cart into file
		dump.dumptofile( file, 512, "LOROM", "SNESROM", true )

		--close file
		assert(file:close())
	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
v3.process = process

-- return the module's table
return v3