local core = require "core"
local common = require "core.common"
local command = require "core.command"
local style = require "core.style"
local View = require "core.view"

local icon_h, icon_w = style.icon_big_font:get_height(), style.icon_big_font:get_width("D")
local toolbar_spacing = icon_w / 2
local toolbar_height = icon_h + style.padding.y * 2

local ToolbarView = View:extend()

local toolbar_commands = {
  {symbol = "f", command = "core:new-doc"},
  {symbol = "D", command = "core:open-file"},
  {symbol = "S", command = "doc:save"},
  {symbol = "L", command = "core:find-file"},
  {symbol = "B", command = "core:find-command"},
  {symbol = "P", command = "core:open-user-module"},
}


function ToolbarView:new()
  ToolbarView.super.new(self)
  self.visible = true
  self.init_size = toolbar_height
  self.tooltip = false
end


function ToolbarView:update()
  if self.init_size then
    self.size.y = self.init_size
    self.init_size = nil
  elseif self.goto_size then
    if self.goto_size ~= self.size.y then
      self:move_towards(self.size, "y", self.goto_size)
    else
      self.goto_size = nil
    end
  end
  ToolbarView.super.update(self)
end


function ToolbarView:toggle_visible()
  self.goto_size = self.visible and 0 or toolbar_height
  self.visible = not self.visible
end


function ToolbarView:each_item()
  local ox, oy = self:get_content_offset()
  local index = 0
  local iter = function()
    index = index + 1
    if index <= #toolbar_commands then
      local dx = style.padding.x + (icon_w + toolbar_spacing) * (index - 1)
      local dy = style.padding.y
      if dx + icon_w > self.size.x then return end
      return toolbar_commands[index], ox + dx, oy + dy, icon_w, icon_h
    end
  end
  return iter
end


function ToolbarView:draw()
  self:draw_background(style.background2)

  for item, x, y in self:each_item() do
    local color = item == self.hovered_item and style.text or style.dim
    common.draw_text(style.icon_big_font, color, item.symbol, nil, x, y, 0, icon_h)
  end
end


function ToolbarView:on_mouse_pressed(button, x, y, clicks)
  local caught = ToolbarView.super.on_mouse_pressed(self, button, x, y, clicks)
  if caught then return end
  core.set_active_view(core.last_active_view)
  if self.hovered_item then
    command.perform(self.hovered_item.command)
  end
end


function ToolbarView:on_mouse_moved(px, py, ...)
  ToolbarView.super.on_mouse_moved(self, px, py, ...)
  self.hovered_item = nil
  local x_min, x_max, y_min, y_max = self.size.x, 0, self.size.y, 0
  for item, x, y, w, h in self:each_item() do
    x_min, x_max = math.min(x, x_min), math.max(x + w, x_max)
    y_min, y_max = y, y + h
    if px > x and py > y and px <= x + w and py <= y + h then
      self.hovered_item = item
      core.status_view:show_tooltip(command.prettify_name(item.command))
      self.tooltip = true
      return
    end
  end
  if self.tooltip and not (px > x_min and px <= x_max and py > y_min and py <= y_max) then
    core.status_view:remove_tooltip()
    self.tooltip = false
  end
end

-- The toolbarview pane is not plugged here but it is added in the
-- treeview plugin.

return ToolbarView