p_x, p_y = 24,16
step_timer = 0
player_sprite_number = 50

the_map = {}

function crystals(story_state)
	add(inventory, make_item(library.item_blueprints.crystal))
	change_screen(screen_conversation({{ph_p, "you can use these crystals for a lot."}}))
	sfx(9)
	toast("received crystal!")
end
the_map["5,0"]=crystals
the_map["6,0"]=crystals

function barrel(story_state)
	sfx(1)
	change_screen(screen_conversation({{ph_p, "it's a barrel!"}}))
end

the_map["2,1"]=barrel
the_map["10,10"]=barrel

the_map["3,1"]=function() -- the atelier!
	sfx(4)
	change_screen(screen_workbench) 
end
the_map["12,1"]=function() --at the well. give us ssome water
	add(inventory, make_item(library.item_blueprints.well_water))
	change_screen(screen_conversation({{ph_p, "slurp!"}}))
	toast("received water!")
	sfx(0)
end

the_map["3,10"] = script_charcoal_seller
the_map["11,5"] = script_neighbor
the_map["9,5"] = script_lenore
the_map["9,8"] = script_library
the_map["11,13"] = script_witch

function herbs(story_state)
	add(inventory, make_item(library.item_blueprints.herb))
	change_screen(screen_conversation({
		{ph_p, "ooh, healing herbs! i'll take some. not more than 1/3 the patch though!"}
	}))
	sfx(8)
	toast("received herbs!")
end

the_map["13,12"] = herbs
the_map["14,12"] = herbs

the_map["12,13"] = herbs
the_map["13,13"] = herbs
the_map["14,13"] = herbs

the_map["12,14"] = herbs
the_map["13,14"] = herbs
the_map["14,14"] = herbs

function beach(story_state)
	add(inventory, make_item(library.item_blueprints.sand))
	change_screen(screen_conversation({
		{ph_p, "how many grains of sand does it take before it becomes a pile?"}
	}))
	sfx(6)
	toast("received sand!")
end

the_map["3,15"] = beach
the_map["4,15"] = beach
the_map["5,15"] = beach
the_map["6,15"] = beach
the_map["7,15"] = beach

function interact(x, y)
	result = the_map[flr(x) .. "," .. flr(y)]
	if result ~= nil then result(story) end
end


function flags_from_xy(x, y)
	return fget(mget(x/8, 16+y/8))
end

function walkaround_update()
	moved=false
	dx, dy = 0, 0
	if btn(0) then dx = -1 end
	if btn(1) then dx = 1 end
	if btn(2) then dy = -1 end
	if btn(3) then dy = 1 end

	
	if dx == -1 then flip_x, up, down = true, false, false end
	if dx == 1 then flip_x, up, down = false, false, false end
	if dy == -1 then up, down = true, false end
	if dy == 1 then up, down = false, true end
	if dx ~= 0 or dy ~= 0 then moved = true end

	if flags_from_xy(p_x + dx, p_y + dy) & 0x80 == 0 then p_x, p_y = p_x + dx, p_y + dy end
	
	if moved then
		t_x, t_y = p_x + 8*dx, p_y + 8*dy
	elseif up then 
		t_x, t_y = p_x, p_y - 8 
	elseif down then 
		t_x, t_y = p_x, p_y + 8 
	elseif flip_x then
		t_x, t_y = p_x - 8, p_y
	else
		t_x, t_y = p_x + 8, p_y
	end

	if btnp(4) then interact(t_x/8, t_y/8) end

end
function walkaround_draw()
	cls()
	rectfill(8,8,120,120,3)
	map(0,16,0,0,16,16) -- draw the town map
	update_player_sprite()

	spr(player_sprite_number, p_x-4, p_y-8, 1,1, flip_x)
	map(0,16,0,0,16,16, 0x40) -- redraw the tiles which are supposed to appear over the player! (flag 6)
end
function update_player_sprite()
	if up then player_sprite_number = 52 + (player_sprite_number % 2)
	elseif down then player_sprite_number = 50 + (player_sprite_number % 2)
	else player_sprite_number = 48 + (player_sprite_number % 2) end

	if moved then
		step_timer += 1
		if step_timer > 4 then 
			step_timer = 0
			if player_sprite_number % 2 == 0 then player_sprite_number += 1
			elseif player_sprite_number % 2 ~= 0 then player_sprite_number -= 1 end
		end
	end
end

screen_walkaround = {update=walkaround_update, draw=walkaround_draw}
screen_walkaround = screen_conversation({
		{ph_p, [[oh, and this is the town! all sorts of things to do here.]]},
		{ph_p, [[like i could go get water from the well to the east,]]},
		{ph_p, [[or pick up some charcoal from the red house to the southwest!]]},
		{ph_p, [[just face a building and press 🅾️!]]}
	}, 
    function() 
        screen_walkaround = {draw=walkaround_draw, update=walkaround_update}
        change_screen(screen_walkaround)
    end,
    screen_walkaround)

fireworks = {}
stars = {}
drag = 0.1
fireworks_frequency = 8
function work(f)
	if f == nil or f.vx == nil or f.vy == nil or f.x == nil or f.y == nil then return 0 end -- why is this necessary.
	local vel = sqrt(f.vx*f.vx + f.vy*f.vy)

	f.x += f.vx
	f.y += f.vy 
	f.vx = f.vx*(1-(drag*vel))
	f.vy = f.vy*(1-(drag*vel))
	return vel
end

function fireworks_update()
	walkaround_update()

	local new_fireworks = {}
	local new_stars = {}

	if rnd(100) < fireworks_frequency then add(new_fireworks, {
		x=rnd(128),
		y=rnd(112)+16,
		vx=rnd(0.4)-0.2,
		vy=-5+rnd(1),
		c=rnd({10, 8, 7})
	}) end

	for f in all(fireworks) do
		local v = work(f)
		if (v < 0.2 or v > 100) and (f.x ~= nil and f.y ~= nil and f.c ~= nil) then
			for i=1,10 do
				local theta = rnd(2)
				add(new_stars,{
					x=f.x,
					y=f.y,
					vx=sin(theta)*2,
					vy=cos(theta)*2,
					c=f.c
				})
			end
			sfx(8)
		else
			add(new_fireworks, f)
		end
	end

	for s in all(stars) do
		local v = work(s)
		if v > 0.2 and v < 100 then
			add(new_stars, s)
		end
	end

	fireworks = new_fireworks
	stars = new_stars
end

function fireworks_draw()
	walkaround_draw()

	for f in all(fireworks) do
		circfill(f.x, f.y, 1, f.c)
	end
	for s in all(stars) do
		circfill(s.x, s.y, 1, s.c)
	end
end