Text

local soluna = require "soluna"
local ltask = require "ltask"
local mattext = require "soluna.material.text"
local matquad = require "soluna.material.quad"
local font = require "soluna.font"
local file = require "soluna.file"

local function font_init()
	if soluna.platform == "wasm" then
		local bundled_path = "asset/font/SourceHanSansSC-Regular.ttf"
		local bundled_data = file.load(bundled_path)
		if bundled_data then
			font.import(bundled_data)
			local bundled_id = font.name "Source Han Sans SC Regular"
			if bundled_id then
				return bundled_id
			end
		end
	end

	local sysfont = require "soluna.font.system"
	local candidates = {
		"WenQuanYi Micro Hei",    -- Linux
		"Microsoft YaHei",        -- Windows
		"Yuanti SC",              -- macOS
		"Source Han Sans SC Regular", -- WASM
	}
	for _, name in ipairs(candidates) do
		local ok, data = pcall(sysfont.ttfdata, name)
		if ok and data then
			font.import(data)
			local fontid = font.name(name)
			if fontid then
				return fontid
			end
		end
	end
	error "No available system font for text sample"
end

soluna.set_window_title "soluna text sample"

local args = ...
local batch = args.batch
local fontid = font_init()
local fontcobj = font.cobj()

local callback = {}
local WIDTH <const> = 200
local HEIGHT <const> = 200
local screen_w = args.width
local screen_h = args.height

function callback.window_resize(w, h)
	screen_w = w
	screen_h = h
end

local TEXT <const> = "Hello, 这是一条很长的句子。它会在文本区居中。"
-- size 32; color 0; alignment center
local block, cursor = mattext.block(fontcobj, fontid, 32, 0, "CV")
local label = block(TEXT, WIDTH, HEIGHT)

local CURSOR_N = 0

function callback.frame(count)
	local x = (screen_w - WIDTH) / 2
	local y = (screen_h - HEIGHT) / 2
	batch:add(matquad.quad(WIDTH, HEIGHT, 0x400000ff), x, y)
	batch:add(label, x, y)
	-- cursor
	local cx, cy, cw, ch, n = cursor(TEXT, CURSOR_N, WIDTH, HEIGHT)
	CURSOR_N = n
	batch:add(matquad.quad(cw, ch, 0xffffff), cx + x, cy + y)
end

function callback.key(keycode, state)
	if state == 1 then         -- press
		if keycode == 262 then -- right
			CURSOR_N = CURSOR_N + 1
		elseif keycode == 263 then -- left
			CURSOR_N = CURSOR_N - 1
		else
			print(keycode)
		end
	end
end

return callback