_G.requireInjector()

local Config   = require('config')
local Security = require('security')
local SHA1     = require('sha1')
local UI       = require('ui')
local Util     = require('util')

local fs         = _G.fs
local multishell = _ENV.multishell
local os         = _G.os
local settings   = _G.settings
local shell      = _ENV.shell

multishell.setTitle(multishell.getCurrent(), 'System')
UI:configure('System', ...)

local env = {
  path = shell.path(),
  aliases = shell.aliases(),
  lua_path = _ENV.LUA_PATH,
}
Config.load('shell', env)

local systemPage = UI.Page {
  tabs = UI.Tabs {
    pathTab = UI.Window {
      tabTitle = 'Path',
      entry = UI.TextEntry {
        x = 2, y = 2, ex = -2,
        limit = 256,
        value = shell.path(),
        shadowText = 'enter system path',
        accelerators = {
          enter = 'update_path',
        },
      },
      grid = UI.Grid {
        y = 4,
        disableHeader = true,
        columns = { { key = 'value' } },
        autospace = true,
      },
    },

    aliasTab = UI.Window {
      tabTitle = 'Aliases',
      alias = UI.TextEntry {
        x = 2, y = 2, ex = -2,
        limit = 32,
        shadowText = 'Alias',
      },
      path = UI.TextEntry {
        y = 3, x = 2, ex = -2,
        limit = 256,
        shadowText = 'Program path',
        accelerators = {
          enter = 'new_alias',
        },
      },
      grid = UI.Grid {
        y = 5,
        sortColumn = 'alias',
        columns = {
          { heading = 'Alias',   key = 'alias' },
          { heading = 'Program', key = 'path'  },
        },
        accelerators = {
          delete = 'delete_alias',
        },
      },
    },

    passwordTab = UI.Window {
      tabTitle = 'Password',
      oldPass = UI.TextEntry {
        x = 2, y = 2, ex = -2,
        limit = 32,
        mask = true,
        shadowText = 'old password',
        inactive = not Security.getPassword(),
      },
      newPass = UI.TextEntry {
        y = 3, x = 2, ex = -2,
        limit = 32,
        mask = true,
        shadowText = 'new password',
        accelerators = {
          enter = 'new_password',
        },
      },
      button = UI.Button {
        x = 2, y = 5,
        text = 'Update',
        event = 'update_password',
      },
      info = UI.TextArea {
        x = 2, ex = -2,
        y = 7,
        value = 'Add a password to enable other computers to connect to this one.',
      }
    },

    infoTab = UI.Window {
      tabTitle = 'Info',
      labelText = UI.Text {
        x = 3, y = 2,
        value = 'Label'
      },
      label = UI.TextEntry {
        x = 9, y = 2, ex = -4,
        limit = 32,
        value = os.getComputerLabel(),
        accelerators = {
          enter = 'update_label',
        },
      },
      grid = UI.ScrollingGrid {
        y = 3,
        values = {
          { name = '',  value = ''                  },
          { name = 'CC version',  value = Util.getVersion()                  },
          { name = 'Lua version', value = _VERSION                           },
          { name = 'MC version',  value = Util.getMinecraftVersion()         },
          { name = 'Disk free',   value = Util.toBytes(fs.getFreeSpace('/')) },
          { name = 'Computer ID', value = tostring(os.getComputerID())       },
          { name = 'Day',         value = tostring(os.day())                 },
        },
        inactive = true,
        columns = {
          { key = 'name',  width = 12 },
          { key = 'value' },
        },
      },
    },
  },
  notification = UI.Notification(),
  accelerators = {
    q = 'quit',
  },
}

if settings then
  local values = { }
  for _,v in pairs(settings.getNames()) do
    table.insert(values, {
      name = v,
      value = not not settings.get(v),
    })
  end

  systemPage.tabs:add({
    systemTab = UI.Window {
      tabTitle = 'Settings',
      grid = UI.Grid {
        y = 1,
        values = values,
        autospace = true,
        sortColumn = 'name',
        columns = {
          { heading = 'Setting',   key = 'name' },
          { heading = 'Value', key = 'value'  },
        },
        accelerators = {
        },
      },
    }
  })
  function systemPage.tabs.systemTab:eventHandler(event)
    if event.type == 'grid_select' then
      event.selected.value = not event.selected.value
      settings.set(event.selected.name, event.selected.value)
      settings.save('.settings')
      self.grid:draw()
      return true
    end
  end
end

function systemPage.tabs.pathTab.grid:draw()
  self.values = { }
  for _,v in ipairs(Util.split(env.path, '(.-):')) do
    table.insert(self.values, { value = v })
  end
  self:update()
  UI.Grid.draw(self)
end

function systemPage.tabs.pathTab:eventHandler(event)

  if event.type == 'update_path' then
    env.path = self.entry.value
    self.grid:setIndex(self.grid:getIndex())
    self.grid:draw()
    Config.update('shell', env)
    systemPage.notification:success('reboot to take effect')
    return true
  end
end

function systemPage.tabs.aliasTab.grid:draw()
  self.values = { }
  for k,v in pairs(env.aliases) do
    table.insert(self.values, { alias = k, path = v })
  end
  self:update()
  UI.Grid.draw(self)
end

function systemPage.tabs.aliasTab:eventHandler(event)

  if event.type == 'delete_alias' then
    env.aliases[self.grid:getSelected().alias] = nil
    self.grid:setIndex(self.grid:getIndex())
    self.grid:draw()
    Config.update('shell', env)
    systemPage.notification:success('reboot to take effect')
    return true

  elseif event.type == 'new_alias' then
    env.aliases[self.alias.value] = self.path.value
    self.alias:reset()
    self.path:reset()
    self:draw()
    self:setFocus(self.alias)
    Config.update('shell', env)
    systemPage.notification:success('reboot to take effect')
    return true
  end
end

function systemPage.tabs.passwordTab:eventHandler(event)
  if event.type == 'update_password' then
    if #self.newPass.value == 0 then
      systemPage.notification:error('Invalid password')
    elseif Security.getPassword() and not Security.verifyPassword(SHA1.sha1(self.oldPass.value)) then
      systemPage.notification:error('Passwords do not match')
    else
      Security.updatePassword(SHA1.sha1(self.newPass.value))
      self.oldPass.inactive = false
      systemPage.notification:success('Password updated')
    end

    return true
  end
end

function systemPage.tabs.infoTab:eventHandler(event)
  if event.type == 'update_label' then
    os.setComputerLabel(self.label.value)
    systemPage.notification:success('Label updated')
    return true
  end
end

function systemPage:eventHandler(event)

  if event.type == 'quit' then
    UI:exitPullEvents()
  elseif event.type == 'tab_activate' then
    event.activated:focusFirst()
  else
    return UI.Page.eventHandler(self, event)
  end
  return true
end

UI:setPage(systemPage)
UI:pullEvents()