extends Control
const hex2font_shader := preload('res://shaders/hex2font.gdshader')

var hexbox: TextureRect
var hexbox_rows: int
var hexbox_cols: int

func make_hexview(data: PoolByteArray, width: int = 256):
	var hex2font_mat := ShaderMaterial.new()
	hex2font_mat.shader = hex2font_shader
	hex2font_mat.set_shader_param('glyph_atlas', SpriteLoader.font_atlas_texture)
	var hex_img := Image.new()

	var l := len(RomLoader.snes_bytes)
	self.hexbox_cols = width
	self.hexbox_rows = l / self.hexbox_cols
	var remainder = l % self.hexbox_cols
	if remainder:
		self.hexbox_rows += 1
		var padding = PoolByteArray()
		padding.resize(self.hexbox_cols - remainder)
		padding.fill(0)
		data = data + padding
	hex2font_mat.set_shader_param('tilemap_size', Vector2(self.hexbox_cols, self.hexbox_rows))
	hex_img.create_from_data(self.hexbox_cols, self.hexbox_rows, false, Image.FORMAT_L8, data)
	hexbox = TextureRect.new()
	hexbox.texture = SpriteLoader.texture_from_image(hex_img)
	hexbox.material = hex2font_mat
	hexbox.rect_scale *= 4
	add_child(hexbox)

func _ready() -> void:
	ProjectSettings.set_setting('display/window/size/snap_to_integer', false)
	make_hexview(RomLoader.snes_bytes, 480)

	var fontbox := TextureRect.new()
	fontbox.texture = SpriteLoader.font_atlas_texture
	add_child(fontbox)

func scroll_hexview(rows: int):
	var current_row: int = (-hexbox.rect_position.y)/4
	var next_row = current_row + rows
	if next_row > (hexbox_rows - 270):
		next_row = hexbox_rows - 270
	if next_row < 0:
		next_row = 0
	hexbox.rect_position.y = -next_row * 4

func _input(event: InputEvent) -> void:
	if event is InputEventMouseButton:
		match event.button_index:
			BUTTON_WHEEL_DOWN:
				scroll_hexview(16)
			BUTTON_WHEEL_UP:
				scroll_hexview(-16)
	elif event is InputEventMouseMotion:
		var row: int = (event.position.y - hexbox.rect_position.y) / 4
		var col: int = event.position.x / 4
		var address: int = col + (row * 480)
		hexbox.set_tooltip('0x%06X' % address)