toast.lua

-- ui/toast.lua
local TOASTS = {}
local TOAST_DURATION = 2.0         -- seconds to display before sliding/fading out
local TOAST_SLIDE_TIME = 0.5       -- seconds to slide out
local TOAST_FADE_STEPS = 8         -- number of fade/slide steps
local TOAST_OFFSET_Y = 0.09        -- normalized vertical gap

-- Helper: Get theme colors and settings (fallback if missing)
local function get_theme_color(ui, path, default)
  local t = ui and ui.theme or {}
  for seg in path:gmatch("[^%.]+") do
    t = t and t[seg]
  end
  return t or default
end

local function get_player_toasts(player)
  local name = type(player) == "string" and player or player:get_player_name()
  TOASTS[name] = TOASTS[name] or {}
  return TOASTS[name]
end

-- Render a styled toast HUD
local function add_toast_hud(player, message, idx, ui)
  local theme = ui.theme or {}
  local bg_color   = get_theme_color(ui, "toast.bg",   "#23272aA0")
  local text_color = get_theme_color(ui, "toast.text", 0xFFFFFF)
  local font_size  = get_theme_color(ui, "toast.font_size", 24)
  local border     = get_theme_color(ui, "toast.border", "#ffaa00")
  local icon       = get_theme_color(ui, "toast.icon", nil) -- optional

  -- Add background box
  local bg_id = player:hud_add({
    hud_elem_type = "image",
    text          = "ui_toast_bg.png^[colorize:"..bg_color, -- You provide a blank/rounded png
    position      = {x=0.5, y=0.08 + (idx-1)*TOAST_OFFSET_Y},
    scale         = {x=2.8, y=0.5}, -- tweak for visual
    alignment     = {x=0, y=0},
    offset        = {x=0, y=0},
    z_index       = 100 + idx,
  })
  -- Add border (optional)
  local border_id
  if border then
    border_id = player:hud_add({
      hud_elem_type = "image",
      text          = "ui_toast_border.png^[colorize:"..border,
      position      = {x=0.5, y=0.08 + (idx-1)*TOAST_OFFSET_Y},
      scale         = {x=2.8, y=0.5},
      alignment     = {x=0, y=0},
      offset        = {x=0, y=0},
      z_index       = 101 + idx,
    })
  end
  -- Add icon (optional)
  local icon_id
  if icon then
    icon_id = player:hud_add({
      hud_elem_type = "image",
      text          = icon,
      position      = {x=0.37, y=0.08 + (idx-1)*TOAST_OFFSET_Y},
      scale         = {x=0.5, y=0.5},
      alignment     = {x=0, y=0},
      offset        = {x=0, y=0},
      z_index       = 102 + idx,
    })
  end
  -- Add text
  local text_id = player:hud_add({
    hud_elem_type = "text",
    position      = {x=0.5, y=0.08 + (idx-1)*TOAST_OFFSET_Y},
    alignment     = {x=0, y=0},
    offset        = {x=0, y=0},
    number        = text_color,
    text          = message,
    z_index       = 103 + idx,
    -- No native font size, but you can fake with text overlays/images if needed
  })

  return {bg_id=bg_id, border_id=border_id, icon_id=icon_id, text_id=text_id}
end

local function remove_toast_hud(player, hud_ids)
  for _, id in pairs(hud_ids) do
    if id then player:hud_remove(id) end
  end
end

-- Slide/fade animation (right or left, with fade)
local function animate_toast_out(player, hud_ids, idx, direction, ui, on_done)
  -- direction = 1 (right), -1 (left)
  for step=1, TOAST_FADE_STEPS do
    minetest.after(step * (TOAST_SLIDE_TIME/TOAST_FADE_STEPS), function()
      local x_shift = 0.5 + direction * 0.25 * (step/TOAST_FADE_STEPS)
      local alpha = math.floor(255 * (1 - step/TOAST_FADE_STEPS))
      -- Only the text HUD supports alpha via number, background uses colorize
      if hud_ids.text_id then
        player:hud_change(hud_ids.text_id, "number", (alpha << 24) | 0xFFFFFF)
        player:hud_change(hud_ids.text_id, "position", {x=x_shift, y=0.08 + (idx-1)*TOAST_OFFSET_Y})
      end
      if hud_ids.bg_id then
        player:hud_change(hud_ids.bg_id, "position", {x=x_shift, y=0.08 + (idx-1)*TOAST_OFFSET_Y})
      end
      if hud_ids.border_id then
        player:hud_change(hud_ids.border_id, "position", {x=x_shift, y=0.08 + (idx-1)*TOAST_OFFSET_Y})
      end
      if hud_ids.icon_id then
        player:hud_change(hud_ids.icon_id, "position", {x=x_shift-0.13, y=0.08 + (idx-1)*TOAST_OFFSET_Y})
      end
    end)
  end
  minetest.after(TOAST_SLIDE_TIME + 0.01, function()
    remove_toast_hud(player, hud_ids)
    if on_done then on_done() end
  end)
end

-- Main function to show a toast
local function show_toast(player, message, ui, opts)
  opts = opts or {}
  local name = type(player) == "string" and player or player:get_player_name()
  local list = get_player_toasts(name)
  local idx = #list + 1

  -- Create the HUD for the toast
  local hud_ids = add_toast_hud(player, message, idx, ui)
  table.insert(list, {hud_ids=hud_ids, onClick=opts.onClick})

  -- Remove after timeout, with slide-out/fade (right or left)
  minetest.after(TOAST_DURATION, function()
    animate_toast_out(player, hud_ids, idx, opts.slide_dir or 1, ui, function()
      -- Remove from stack
      local mylist = get_player_toasts(name)
      for i, toast in ipairs(mylist) do
        if toast.hud_ids == hud_ids then table.remove(mylist, i); break end
      end
      -- Repack remaining toasts upward
      for i, toast in ipairs(mylist) do
        local pos = {x=0.5, y=0.08 + (i-1)*TOAST_OFFSET_Y}
        if toast.hud_ids.text_id then player:hud_change(toast.hud_ids.text_id, "position", pos) end
        if toast.hud_ids.bg_id then player:hud_change(toast.hud_ids.bg_id, "position", pos) end
        if toast.hud_ids.border_id then player:hud_change(toast.hud_ids.border_id, "position", pos) end
        if toast.hud_ids.icon_id then player:hud_change(toast.hud_ids.icon_id, "position", {x=pos.x-0.13, y=pos.y}) end
      end
    end)
  end)
end

-- (OPTIONAL) Simulated "click": user types /toastclick <n> or (if using Luanti/client mod) triggers real click
minetest.register_chatcommand("toastclick", {
  params = "<n>",
  description = "Simulate clicking a toast",
  func = function(name, param)
    local idx = tonumber(param)
    local list = get_player_toasts(name)
    if idx and list[idx] and list[idx].onClick then
      list[idx].onClick(name)
    end
  end
})

return {
  show_toast = show_toast,
}