--listing pane

//room for 14 lines in the listing

selected_address = {"main", 1}

function l_pane_update()
	if current_pane == 1 then
		if last_edit_pane == 3 then
			handle = holding
			if (handle==nil) handle=under
			addr = get_address_from_handle(handle)
			if (addr ~= nil) selected_address=addr
		end
		last_edit_pane = 1
		
		if btn(4) then
			dx = 0
			dy = 0
	
			if (btn(0) and tx > 0) dx -= 1
			if (btn(1) and tx < 127) dx += 1
			if (btn(2) and ty > 0) dy -= 1
			if (btn(3) and ty < 127) dy += 1
			
			local h = nil
			for handle in all(record_list) do
				if deep_eq(handle.address, selected_address) then
					h = handle
				end
			end
			if h ~= nil then
				perform_edit(m, h, dx, dy, false)
			end
		else
			if btnp(2) then
				selected_address[2] -= 1
				if selected_address[2] < 1 then
					selected_address[1] = get_previous_bank(selected_address[1])
					selected_address[2] = #m[selected_address[1]]
				end
			end
			if btnp(3) then
			 selected_address[2] += 1
			 if selected_address[2] > #m[selected_address[1]] then
			 	selected_address[1] = get_next_bank(selected_address[1])
			 	selected_address[2] = 1
			 end
			end
		end
	end
end

// this should get run when we
// switch from the render pane 
// to the listing pane, to get
// a selection in the listing
// pane
function get_address_from_handle(handle)
 if handle ~= nil then
		return deep_copy(handle.address)
	else
		return nil
	end
end

function get_previous_bank(bank)
	local i = #banks
	for b in all(banks) do
		if b == bank then
			break
		end
		i += 1
		if i > #banks then
			i = 1
		end
	end
	return banks[i]
end

function get_next_bank(bank)
	local i = 1
	for b in all(banks) do
  i += 1
  if i > #banks then
  	i = 1
  end
		if b == bank then
			break
		end
	end
	return banks[i]
end

disp_start = 1
window_size = 14
margin = 2
function l_pane_draw()
	the_listing = make_listing()
	
	s_index = nil
	
	for idx, listing in pairs(the_listing) do
		if deep_eq(listing[3], selected_address) then
			s_index = idx
		end
	end
	
	// if the selected line is 
	// outside the bounds, then
	// move the bounds.
	
	// if the selected line is
	// less than start+margin
	// then we need to move start
	// up (decrease it)
	while s_index < disp_start + margin do
		disp_start = disp_start - 1
	end 
	
	// if it's greater than 
	// start+window_size - margin
	// then we need to move start 
	// down (increase it) 
	while s_index >= disp_start + window_size - margin do
		disp_start = disp_start + 1
	end 
	
	// if start + window_size is
	// greater than the number of
	// lines in the listing, then
	// move back up (decrease)
	if disp_start + window_size > #the_listing then
		disp_start = #the_listing - window_size + 1
	end
	
	// if start is less than 1
	// then start should be 1
	if (disp_start < 1) disp_start = 1
	
	for i, v in pairs(the_listing) do
		if i>=disp_start and i < disp_start + window_size then
			print(v[1], 0, 17+7*(i - disp_start), v[2])
		end
	end
end

function make_listing()
	local output = {}
	for bank in all(banks) do
		contents = m[bank]
		
		str = ":"..bank..":"
		col = 13
		addr = nil
		
		add(output, {str, col, addr})
		
		for j,op in pairs(contents) do
			str = op_pretty_print(op)
			col = get_line_color(bank, j)
			addr = {bank, j}
			
			add(output, {str, col, addr})
		end
	end

	return output
end
function get_line_color(bank, idx)
	if bank==selected_address[1]
		and idx==selected_address[2] then
		return 6
	end
	return 13
end

function op_pretty_print(op)
	opc = "n"
	
	if (op[1]=="return") opc="return"
	if (op[1]=="jump") opc="j"
	if (op[1]=="scale") opc="s"
 if (op[1]=="rotate") opc="rot "
	if (op[1]=="move") opc="m"
	if (op[1]=="place") opc="p"
	if (op[1]=="draw") opc="d"
	if (op[1]=="draw_abs") opc="a"
	if (op[1]=="color") opc="c"
	
	if #op == 2 then
		opc = opc..op[2]
	elseif #op == 3 then
		arg1 = sub(tostr(op[2]), 1, 3)
		arg2 = sub(tostr(op[3]), 1, 3)
		opc = opc..arg1..","..arg2
	end
	
	return opc
end