local Config = require('opus.config')
local UI     = require('opus.ui')

local ccemux = _G.ccemux

local sides = { 'bottom', 'top', 'back', 'front', 'right', 'left' }

local tab = UI.Tab {
  title = 'CCEmuX',
  description = 'CCEmuX peripherals',
  form = UI.Form {
    x = 2, ex = -2, y = 2, ey = 5,
    values = {
      side = 'bottom',
      type = 'wireless_modem',
    },
    manualControls = true,
    side = UI.Chooser {
      formLabel = 'Side', formKey = 'side',
      width = 10,
    },
    ptype = UI.Chooser {
      formLabel = 'Type', formKey = 'type',
      width = 10,
      choices = {
        { name = 'Modem', value = 'wireless_modem' },
        { name = 'Drive', value = 'disk_drive'     },
      },
    },
    drive_id = UI.TextEntry {
      x = 19, y = 3,
      formKey = 'drive_id',
      shadowText = 'id',
      width = 5,
      limit = 3,
      transform = 'number',
    },
    add = UI.Button {
      x = -6, y = 3, width = 5,
      text = 'Add', event = 'form_ok',
    },
  },
  grid = UI.Grid {
    x = 2, ex = -2, y = 7, ey = -2,
    columns = {
      { heading = 'Side', key = 'side', width = 8 },
      { heading = 'Type', key = 'type' },
      { heading = 'ID',   key = 'args', width = 4 },
    },
  },
}

function tab:updatePeripherals(config)
  self.grid.values = { }
  for k,v in pairs(config) do
    table.insert(self.grid.values, {
      side = k,
      type = v.type,
      args = v.args and v.args.id,
    })
  end
  self.grid:update()
end

function tab:enable()
  local config = Config.load('ccemux')

  local choices = { }
  for _,k in pairs(sides) do
    table.insert(choices, { name = k, value = k })
  end
  self.form.side.choices = choices

  self:updatePeripherals(config)
  UI.Tab.enable(self)

  self.form.drive_id.enabled = false
end

function tab:eventHandler(event)
  if event.type == 'form_complete' then
    if event.values.type == 'disk_drive' and not event.values.drive_id then
      self:emit({ type = 'error_message', message = 'Invalid drive ID' })
    else
      ccemux.detach(event.values.side)

      local config = Config.load('ccemux')
      config[event.values.side] = {
        type = event.values.type
      }
      if event.values.type == 'disk_drive' then
        config[event.values.side].args = {
          id = event.values.drive_id
        }
        ccemux.attach(event.values.side, event.values.type, { id = event.values.drive_id })
      else
        ccemux.attach(event.values.side, event.values.type)
      end
      Config.update('ccemux', config)
      self:updatePeripherals(config)
      self.grid:draw()

      self:emit({ type = 'success_message', message = 'Attached' })
    end

  elseif event.type == 'choice_change' then
    if event.element == self.form.ptype then
      self.form.drive_id.enabled = event.value == 'disk_drive'
      self.form:draw()
    end

  elseif event.type == 'grid_select' then
    local config = Config.load('ccemux')
    config[event.selected.side] = nil
    Config.update('ccemux', config)
    self:updatePeripherals(config)
    self.grid:draw()

    self:emit({ type = 'success_message', message = 'Detached' })

    return true
  end
end

return tab