local state = require 'bugabinga.cmdline.state'
local render = require 'bugabinga.cmdline.render'
local popupmenu = require 'bugabinga.cmdline.popupmenu'

local ns = vim.api.nvim_create_namespace 'bugabinga.cmdline'
local attached = false

local handlers = {
  cmdline_show = function(content, pos, firstc, prompt, indent, level)
    local cmdline_state = state.new(content, pos, firstc, prompt, indent, level)
    render.show(cmdline_state)
  end,
  cmdline_pos = function(pos, level)
    local cmdline_state = state.new({}, pos, '', '', 0, level)
    render.update_cursor(cmdline_state)
  end,
  cmdline_hide = function(abort)
    render.hide()
  end,
  popupmenu_show = function(items, selected, row, col, grid)
    local text = render.get_text() or ''
    local prefix = (col >= 0 and col < #text) and text:sub(col + 1) or ''
    popupmenu.on_show(items, selected, row, col, grid, prefix)
  end,
  popupmenu_select = function(selected)
    popupmenu.on_select(selected)
  end,
  popupmenu_hide = function()
    popupmenu.on_hide()
  end,
}

local function dispatch(event, ...)
  local handler = handlers[event]
  if handler then
    handler(...)
    return true
  end
  return false
end

local function disable()
  if not attached then
    return
  end
  vim.ui_detach(ns)
  attached = false
  render.hide()
  popupmenu.on_hide()
end

if not attached then
  vim.ui_attach(ns, { ext_cmdline = true, ext_popupmenu = true }, function(event, ...)
    return dispatch(event, ...)
  end)
  attached = true
end

_G.BugabingaCmdline = {
  disable = disable,
}

return BugabingaCmdline