local state = runtime.import("state")
local ui = runtime.import("ui")
---@type RuntimeUi
local runtime_ui = runtime.import("runtime_ui")
local examples = runtime.import("examples")
local i18n = runtime.import("i18n")
---@type RuntimeCommands
local commands = runtime.import("runtime_commands")
---@type RuntimeWidgets
local widgets = runtime.import("runtime_widgets")
local theme = runtime.import("theme")

widgets.configure({
  primary = theme.primary,
  secondary = "#ff475569",
  success = theme.success,
  overlay = "#99000000",
  surface = "#ff1e293b",
  surfaceAlt = theme.border,
  card = "#ee111827",
  text = theme.text,
  muted = theme.muted,
  progress = theme.success,
  transparent = "#00000000"
})

function smoke_test(ctx)
  return ctx ~= nil
    and ctx.runtimeApiVersion ~= nil
    and examples.all ~= nil
    and i18n.t ~= nil
    and ui.create_nodes ~= nil
    and widgets.dialog ~= nil
    and commands.sequence ~= nil
end

local function apply_context(ctx)
  if ctx == nil then
    return
  end
  i18n.apply_context(ctx)
  if ctx.screen ~= nil then
    state.screen_width = ctx.screen.width or state.screen_width
    state.screen_height = ctx.screen.height or state.screen_height
  end
  if ctx.viewport ~= nil then
    state.viewport_width = ctx.viewport.width or state.viewport_width
    state.viewport_height = ctx.viewport.height or state.viewport_height
    state.viewport_scale = ctx.viewport.scaleX or state.viewport_scale
  end
end

function init(ctx)
  apply_context(ctx)
  state.status = i18n.t("status_ready")
  return {
    render = { creates = ui.create_nodes() },
    ui = {},
    commands = {}
  }
end

---@param text string
---@return RuntimeDiff
local function status_only(text)
  return {
    ui = { updates = ui.status_updates(text) }
  }
end

---@return RuntimeDiff
local function handle_anim()
  return {
    ui = { updates = ui.status_updates("执行 sequence + parallel：移动、缩放、旋转、淡入淡出。") },
    commands = {
      commands.sequence({
        commands.move_path("sample_circle", {
          { x = 104, y = 42 },
          { x = 180, y = 44 },
          { x = 248, y = 78 }
        }, { duration = 0.75, group = "demo_anim" }),
        commands.parallel({
          commands.scale_to("sample_circle", 1.45, { duration = 0.35, group = "demo_anim" }),
          commands.rotate_to("sample_circle", 6.28, { duration = 0.35, group = "demo_anim" }),
          commands.fade_to("sample_circle", 0.45, { duration = 0.35, group = "demo_anim" })
        }, { group = "demo_anim" }),
        commands.parallel({
          commands.move_to("sample_circle", 104, 42, { duration = 0.55, group = "demo_anim" }),
          commands.scale_to("sample_circle", 1, { duration = 0.55, group = "demo_anim" }),
          commands.fade_to("sample_circle", 1, { duration = 0.55, group = "demo_anim" })
        }, { group = "demo_anim" })
      }, { id = "demo_anim_sequence", group = "demo_anim", onComplete = "demo_anim_done" })
    }
  }
end

---@return RuntimeDiff
local function handle_cancel()
  return {
    ui = { updates = ui.status_updates("已发送 cancel_commands：group = demo_anim。") },
    commands = { commands.cancel_group("demo_anim") }
  }
end

---@return RuntimeDiff
local function handle_progress()
  state.progress = state.progress + 0.15
  if state.progress > 1 then
    state.progress = 0.05
  end
  local updates = ui.progress_updates()
  local status_updates = ui.status_updates("通过 NodeDiff.update 更新 progress.value = " .. tostring(state.progress))
  for _, update in ipairs(status_updates) do
    table.insert(updates, update)
  end
  return { render = { updates = updates } }
end

---@return RuntimeDiff
local function handle_visibility()
  state.visible = not state.visible
  local updates = ui.visibility_updates()
  local status_updates = ui.status_updates("通过 visible / alpha 更新节点显示状态。")
  for _, update in ipairs(status_updates) do
    table.insert(updates, update)
  end
  return { render = { updates = updates } }
end

---@return RuntimeDiff
local function handle_dialog()
  if state.dialog_open then
    return status_only("Dialog 已经打开；点击关闭按钮移除它。")
  end
  state.dialog_open = true
  return {
    ui = {
      creates = ui.dialog_nodes(),
      updates = ui.status_updates("创建 widgets.dialog：Lua 组合普通 RuntimeNode。")
    }
  }
end

---@return RuntimeDiff
local function handle_close_dialog()
  state.dialog_open = false
  return {
    ui = {
      removes = ui.dialog_removes(),
      updates = ui.status_updates("通过 GameDiff.removes 移除 Dialog 节点。")
    }
  }
end

---@return RuntimeDiff
local function handle_temp()
  if state.temp_node_visible then
    state.temp_node_visible = false
    return {
      render = { removes = { { id = "temp_node" }, { id = "temp_node_text" } } },
      ui = { updates = ui.status_updates("通过 GameDiff.removes 移除临时节点。") }
    }
  end

  state.temp_node_visible = true
  return {
    render = { creates = ui.temp_nodes() },
    ui = { updates = ui.status_updates("创建临时节点，并用 delay + remove_node 自动删除。") },
    commands = {
      commands.sequence({
        commands.delay(1.2, { id = "temp_delay", group = "temp" }),
        commands.remove_node("temp_node", { group = "temp" }),
        commands.remove_node("temp_node_text", { group = "temp", onComplete = "temp_removed" })
      }, { group = "temp" })
    }
  }
end

---@return RuntimeDiff
local function handle_sound()
  return {
    ui = { updates = ui.status_updates("播放 manifest 资源 click：commands.play_sound('click')。") },
    commands = { commands.play_sound("click", { volume = 0.8, onComplete = "sound_done" }) }
  }
end

---@return RuntimeDiff
local function handle_bgm()
  if state.bgm_state == "stopped" then
    state.bgm_state = "playing"
    return {
      ui = { updates = ui.status_updates("启动 BGM channel=demo：play_bgm，可继续点击切换暂停/恢复/停止。") },
      commands = { commands.play_bgm("click", { channel = "demo", loop = true, volume = 0.25 }) }
    }
  end

  if state.bgm_state == "playing" then
    state.bgm_state = "paused"
    return {
      ui = { updates = ui.status_updates("暂停 BGM：pause_bgm('demo')。") },
      commands = { commands.pause_bgm("demo") }
    }
  end

  if state.bgm_state == "paused" then
    state.bgm_state = "resumed"
    return {
      ui = { updates = ui.status_updates("恢复 BGM：resume_bgm('demo')。") },
      commands = { commands.resume_bgm("demo") }
    }
  end

  state.bgm_state = "stopped"
  return {
    ui = { updates = ui.status_updates("停止 BGM：stop_bgm('demo')。") },
    commands = { commands.stop_bgm("demo") }
  }
end

---@return RuntimeDiff
local function handle_text_change()
  state.text_variant = state.text_variant == "plain" and "styled" or "plain"
  local updates = ui.text_updates()
  local status_updates = ui.status_updates("Text 当前是纯文本协议；富文本 richText/spans 尚未支持。")
  for _, update in ipairs(status_updates) do
    table.insert(updates, update)
  end
  return { ui = { updates = updates } }
end

---@return RuntimeDiff
local function handle_text_style()
  state.text_variant = state.text_variant == "plain" and "styled" or "plain"
  local updates = ui.text_updates()
  local status_updates = ui.status_updates("已切换 text 的 color/fontSize；不是富文本。")
  for _, update in ipairs(status_updates) do
    table.insert(updates, update)
  end
  return { ui = { updates = updates } }
end

---@return RuntimeDiff
local function handle_button_primary()
  return {
    ui = { updates = ui.status_updates("按钮点击：RuntimeEvent.tap -> Lua handler。") },
    commands = { commands.play_sound("click", { volume = 0.55 }) }
  }
end

---@return RuntimeDiff
local function handle_button_toggle()
  state.button_active = not state.button_active
  local updates = ui.button_updates()
  local status_updates = ui.status_updates(state.button_active and "按钮恢复可点击状态。" or "按钮切换为置灰状态。")
  for _, update in ipairs(status_updates) do
    table.insert(updates, update)
  end
  return { ui = { updates = updates } }
end

---@return RuntimeDiff
local function handle_button_image_tap()
  return {
    ui = { updates = ui.status_updates("图片按钮点击：按下时显示 pressedAsset，松开回到 asset。") },
    commands = { commands.play_sound("click", { volume = 0.45 }) }
  }
end

---@return RuntimeDiff
local function handle_button_image_toggle()
  state.button_image_enabled = not state.button_image_enabled
  local updates = ui.button_image_updates()
  local status_updates = ui.status_updates(state.button_image_enabled and "图片按钮恢复 interactive=true。" or "图片按钮设为 interactive=false，显示 disabledAsset。")
  for _, update in ipairs(status_updates) do
    table.insert(updates, update)
  end
  return { ui = { updates = updates } }
end

---@return RuntimeDiff
local function handle_sprite_anim()
  return {
    ui = { updates = ui.status_updates("精灵节点执行 move_to + rotate_to。") },
    commands = {
      commands.parallel({
        commands.move_to("sprite_sprite_demo", 154, 54, { duration = 0.35, group = "sprite_demo" }),
        commands.rotate_to("sprite_sprite_demo", 6.28, { duration = 0.35, group = "sprite_demo" })
      }, { group = "sprite_demo", onComplete = "sprite_anim_done" })
    }
  }
end

---@return RuntimeDiff
local function handle_sprite_style()
  state.sprite_variant = state.sprite_variant == "image" and "sprite" or "image"
  local updates = ui.sprite_updates()
  local status_updates = ui.status_updates("切换 sprite 示例样式：" .. state.sprite_variant)
  for _, update in ipairs(status_updates) do
    table.insert(updates, update)
  end
  return { ui = { updates = updates } }
end

---@param value string
---@return RuntimeDiff
local function handle_radio(value)
  state.radio_selected = value
  local updates = ui.radio_updates()
  local status_updates = ui.status_updates("RadioGroup 选择：" .. value)
  for _, update in ipairs(status_updates) do
    table.insert(updates, update)
  end
  return { ui = { updates = updates } }
end

---@param index integer
---@return RuntimeDiff
local function handle_list_pick(index)
  local items = { "Lua", "Runtime", "Flame", "Diff", "Command" }
  if index < 1 then
    index = #items
  elseif index > #items then
    index = 1
  end
  state.list_selected = items[index]
  if state.list_axis == "horizontal" then
    state.list_scroll_x = math.min(math.max((index - 2) * 126, 0), 330)
    state.list_scroll_y = 0
  else
    state.list_scroll_x = 0
    state.list_scroll_y = math.min(math.max((index - 2) * 28, 0), 78)
  end
  local updates = ui.list_updates()
  local status_updates = ui.status_updates("ListView 选中：" .. state.list_selected .. "，双轴滚动已更新。")
  for _, update in ipairs(status_updates) do
    table.insert(updates, update)
  end
  return { ui = { updates = updates } }
end

---@return RuntimeDiff
local function handle_list_horizontal()
  state.list_axis = state.list_axis == "horizontal" and "vertical" or "horizontal"
  state.list_scroll_x = 0
  state.list_scroll_y = 0
  local updates = ui.list_updates()
  local status_updates = ui.status_updates("ListView 排列方向：" .. state.list_axis)
  for _, update in ipairs(status_updates) do
    table.insert(updates, update)
  end
  return { ui = { updates = updates } }
end

---@return RuntimeDiff
local function handle_list_reset()
  state.list_scroll_x = 0
  state.list_scroll_y = 0
  local updates = ui.list_updates()
  local status_updates = ui.status_updates("ListView 滚动已重置；滚轮/拖拽会触发 onScroll。")
  for _, update in ipairs(status_updates) do
    table.insert(updates, update)
  end
  return { ui = { updates = updates } }
end

---@param event RuntimeEvent
---@return RuntimeDiff
local function handle_list_scrolled(event)
  if event.data ~= nil then
    state.list_scroll_x = event.data.scrollX or state.list_scroll_x
    state.list_scroll_y = event.data.scrollY or state.list_scroll_y
  end
  return {
    ui = { updates = ui.status_updates("onScroll 回调：" .. tostring(state.list_scroll_x) .. ", " .. tostring(state.list_scroll_y)) }
  }
end

---@param step integer
---@return RuntimeDiff
---@param preset string
---@return RuntimeDiff
local function handle_particle(preset)
  state.particle_seed = (state.particle_seed or 0) + 1
  local count = 42 + (state.particle_seed % 5)
  local updates = {
    runtime_ui.update("particle_burst", {
      preset = preset == "confetti" and "confetti" or "burst",
      count = count,
      duration = preset == "confetti" and 1.2 or 0.85,
      color = preset == "confetti" and "#ffff4d6d" or "#ffffcc33",
      colorTo = preset == "confetti" and "#fffacc15" or "#00ffcc33",
      gravityY = preset == "confetti" and 240 or 90,
      spread = preset == "confetti" and 90 or 360,
      visible = preset ~= "snow"
    }),
    runtime_ui.update("particle_trail", {
      visible = preset == "burst"
    }),
    runtime_ui.update("particle_snow", {
      count = 56 + (state.particle_seed % 7),
      visible = preset == "snow"
    })
  }
  local status_updates = ui.status_updates("Particle 预设：" .. preset)
  for _, update in ipairs(status_updates) do
    table.insert(updates, update)
  end
  return { ui = { updates = updates } }
end

local function handle_list(step)
  local items = { "Lua", "Runtime", "Flame", "Diff", "Command" }
  local index = 1
  for i, value in ipairs(items) do
    if value == state.list_selected then
      index = i
      break
    end
  end
  return handle_list_pick(index + step)
end

---@param mode string
---@return RuntimeDiff
local function handle_layout(mode)
  state.layout_mode = mode
  local updates = ui.layout_updates(mode)
  local status_updates = ui.status_updates("布局示例：" .. mode)
  for _, update in ipairs(status_updates) do
    table.insert(updates, update)
  end
  return { ui = { updates = updates } }
end

---@return RuntimeDiff
local function handle_resource()
  if state.resource_state == "ready" then
    state.resource_state = "evicted"
    return {
      ui = { updates = ui.status_updates("释放资源组 media：evict_resources。再次点击会 preload。") },
      commands = { commands.evict_group("media") }
    }
  end

  state.resource_state = "ready"
  return {
    ui = { updates = ui.status_updates("预载资源组 media：preload_resources。") },
    commands = { commands.preload_group("media", { failOnError = true }) }
  }
end

---@return RuntimeDiff
---@return RuntimeDiff
local function handle_i18n_toggle()
  local locale = i18n.toggle_locale()
  return {
    ui = { updates = ui.locale_updates() },
    commands = { commands.toast(i18n.t("i18n_switched") .. locale) }
  }
end

---@return RuntimeDiff
local function handle_i18n_refresh()
  return {
    ui = { updates = ui.locale_updates() }
  }
end

---@param mode string
---@return RuntimeDiff
local function handle_responsive(mode)
  state.responsive_mode = mode
  local label = i18n.t("responsive_desktop")
  if mode == "phone" then
    label = i18n.t("responsive_phone")
  elseif mode == "tablet" then
    label = i18n.t("responsive_tablet")
  end
  local updates = ui.responsive_updates()
  local status_updates = ui.status_updates(label)
  for _, update in ipairs(status_updates) do
    table.insert(updates, update)
  end
  return { ui = { updates = updates } }
end

---@param event RuntimeEvent
---@return RuntimeDiff
local function handle_resize(event)
  if event.data ~= nil then
    apply_context(event.data)
  end
  return { ui = { updates = ui.responsive_updates() } }
end

---@return RuntimeDiff
local function handle_toast()
  return {
    ui = { updates = ui.status_updates("发送 toast 命令：Runtime 会显示临时 overlay 并自动移除。") },
    commands = { commands.toast("Hello from Lua showcase") }
  }
end

---@param target? string
---@return RuntimeDiff
local function handle_select_example(target)
  local id = string.sub(target or "example_nodes", 9)
  local selected = examples.find(id)
  state.selected_example = selected.id
  state.detail_tab = "code"
  return {
    ui = { updates = ui.example_updates(selected) }
  }
end

---@param tab string
---@return RuntimeDiff
local function handle_detail_tab(tab)
  state.detail_tab = tab
  return { ui = { updates = ui.example_updates(examples.find(state.selected_example)) } }
end

---@return RuntimeDiff
local function handle_copy_detail()
  local selected = examples.find(state.selected_example)
  local text = selected.code
  local label = "代码"
  if state.detail_tab == "params" then
    text = i18n.example_params(selected)
    label = "参数说明"
  end
  return {
    ui = { updates = ui.status_updates("已复制" .. label .. "到剪贴板。") },
    commands = { commands.copy_text(text) }
  }
end

function on_event(event)
  if event.handler == "select_example" then
    return handle_select_example(event.target)
  end
  if event.handler == "detail_tab_code" then
    return handle_detail_tab("code")
  end
  if event.handler == "detail_tab_params" then
    return handle_detail_tab("params")
  end
  if event.handler == "copy_detail" then
    return handle_copy_detail()
  end
  if event.handler == "demo_anim" then
    return handle_anim()
  end
  if event.handler == "demo_cancel" then
    return handle_cancel()
  end
  if event.handler == "demo_progress" then
    return handle_progress()
  end
  if event.handler == "demo_visibility" then
    return handle_visibility()
  end
  if event.handler == "demo_dialog" then
    return handle_dialog()
  end
  if event.handler == "close_dialog" then
    return handle_close_dialog()
  end
  if event.handler == "demo_temp" then
    return handle_temp()
  end
  if event.handler == "demo_text_change" then
    return handle_text_change()
  end
  if event.handler == "demo_text_style" then
    return handle_text_style()
  end
  if event.handler == "demo_button_primary" then
    return handle_button_primary()
  end
  if event.handler == "demo_button_toggle" then
    return handle_button_toggle()
  end
  if event.handler == "demo_button_image_tap" then
    return handle_button_image_tap()
  end
  if event.handler == "demo_button_image_toggle" then
    return handle_button_image_toggle()
  end
  if event.handler == "demo_sprite_anim" then
    return handle_sprite_anim()
  end
  if event.handler == "demo_sprite_style" then
    return handle_sprite_style()
  end
  if event.handler == "demo_radio_audio" then
    return handle_radio("audio")
  end
  if event.handler == "demo_radio_spine" then
    return handle_radio("spine")
  end
  if event.handler == "demo_radio_lua" then
    return handle_radio("Lua")
  end
  if event.handler == "demo_list_prev" then
    return handle_list(-1)
  end
  if event.handler == "demo_list_next" then
    return handle_list(1)
  end
  if event.handler == "demo_list_horizontal" then
    return handle_list_horizontal()
  end
  if event.handler == "demo_list_reset" then
    return handle_list_reset()
  end
  if event.handler == "demo_list_scrolled" then
    return handle_list_scrolled(event)
  end
  if event.handler == "demo_list_pick_1" then
    return handle_list_pick(1)
  end
  if event.handler == "demo_list_pick_2" then
    return handle_list_pick(2)
  end
  if event.handler == "demo_list_pick_3" then
    return handle_list_pick(3)
  end
  if event.handler == "demo_list_pick_4" then
    return handle_list_pick(4)
  end
  if event.handler == "demo_list_pick_5" then
    return handle_list_pick(5)
  end
  if event.handler == "demo_particle_burst" then
    return handle_particle("burst")
  end
  if event.handler == "demo_particle_confetti" then
    return handle_particle("confetti")
  end
  if event.handler == "demo_particle_snow" then
    return handle_particle("snow")
  end
  if event.handler == "demo_layout_row" then
    return handle_layout("row")
  end
  if event.handler == "demo_layout_column" then
    return handle_layout("column")
  end
  if event.handler == "demo_layout_box" then
    return handle_layout("box")
  end
  if event.handler == "demo_sound" then
    return handle_sound()
  end
  if event.handler == "demo_bgm" then
    return handle_bgm()
  end
  if event.handler == "demo_resource" then
    return handle_resource()
  end
  if event.handler == "demo_i18n_toggle" then
    return handle_i18n_toggle()
  end
  if event.handler == "demo_i18n_refresh" then
    return handle_i18n_refresh()
  end
  if event.handler == "demo_responsive_phone" then
    return handle_responsive("phone")
  end
  if event.handler == "demo_responsive_tablet" then
    return handle_responsive("tablet")
  end
  if event.handler == "demo_responsive_desktop" then
    return handle_responsive("desktop")
  end
  if event.handler == "demo_toast" then
    return handle_toast()
  end
  if event.type == "resize" then
    return handle_resize(event)
  end
  if event.handler == "demo_anim_done" then
    return status_only("动画完成事件：RuntimeCommand.onComplete -> RuntimeEvent -> Lua。")
  end
  if event.handler == "temp_removed" then
    state.temp_node_visible = false
    return status_only("临时节点已由 remove_node 命令删除。")
  end
  if event.handler == "sound_done" then
    return status_only("音效播放完成事件已回到 Lua。")
  end
  if event.handler == "sprite_anim_done" then
    return status_only("精灵动画完成。")
  end

  return {}
end