function _G.statusline()
  local bufnr = vim.fn.bufnr() or 0
  local hi = statusline_color(vim.fn.mode())

  local sl = hi
  -- sl = sl .. statusline_append([[ ⢷]], 'StatusLineIcon', hi)

  sl = sl .. [[%-h%-w%-q%-f %-m %-r]]

  -- sl = sl .. statusline_append(statusline_ts(), 'StatusLineTreesitter', hi)

  sl = sl .. [[ %= ]] -- spacer

  sl = sl .. statusline_append(statusline_lsp_diagnostics(bufnr, hi), 'StatusLineDiagnostics', hi)

  sl = sl .. statusline_append(statusline_lspstatus(), 'StatusLineLsp', hi)

  sl = sl .. statusline_append(statusline_dap(), 'StatusLineDap', hi)

  -- sl = sl .. [[ %= ]] -- spacer

  sl = sl .. statusline_append(statusline_notify(hi), 'StatusLineNotify', hi)

  sl = sl .. statusline_append(statusline_spinner(bufnr), 'StatusLineJobs', hi)

  sl = sl .. [[%-l:%-v --%p%%-- %-Y]]

  return sl
end

function _G.statusline_color(mode)
  local hi = '%*'
  if mode == 'i' then
    -- hi = '%#StatusLineInsert#'
  elseif mode == 'c' then
    -- hi = '%#StatusLineCommand#'
  elseif mode == 'v' or mode == 'V' or mode == '' then
    hi = '%#StatusLineVisual#'
  elseif mode == 'R' or mode == 'Rv' then
    hi = '%#StatusLineReplace#'
  end
  -- return '%{g:actual_curwin==win_getid()?'.. hi ..':%#StatusLineNC#}'
  return hi
end

-- does item highlighting and conditionnal spacing
function _G.statusline_append(element, hi, default_hi, opts)
  if not element or element == '' then
    return ''
  end
  opts = opts or { append_space = true }

  if hi ~= nil then
    hi = '%#' .. hi .. '#'
  end
  if not (default_hi == '%*') then
    hi = default_hi
  end
  local el = hi .. element .. default_hi
  if opts.append_space then
    el = el .. ' '
  end
  return el
end

function _G.statusline_combine_hi(outer_name, inner_name)
  local outer = vim.api.nvim_get_hl_by_id(vim.api.nvim_get_hl_id_by_name(outer_name), true)
  local inner = vim.api.nvim_get_hl_by_id(vim.api.nvim_get_hl_id_by_name(inner_name), true)
  local hi = 'auto' .. outer_name .. inner_name
  if pcall(vim.api.nvim_get_hl_by_name, hi, true) then
    return hi
  end
  local gui
  gui = inner.bold and 'bold'
  gui = inner.italic and 'italic'
  gui = inner.underline and 'underline'
  vim.api.nvim_set_hl(0, hi, { bg = outer.background, fg = inner.foreground, gui = gui })
  return hi
end

function _G.statusline_lsp_diagnostics(bufnr, default_hi)
  local error_num = vim.diagnostic.get(bufnr, { severity = vim.diagnostic.severity.ERROR })
  local warn_num = vim.diagnostic.get(bufnr, { severity = vim.diagnostic.severity.WARN })

  local s = ''
  if #error_num > 0 then
    local errs = vim.fn.sign_getdefined('DiagnosticSignError')[1].text .. #error_num
    s = s
      .. statusline_append(
        errs,
        statusline_combine_hi('StatusLineDiagnostics', 'DiagnosticError'),
        default_hi
      )
  end
  if #warn_num > 0 then
    local warns = vim.fn.sign_getdefined('DiagnosticSignWarn')[1].text .. #warn_num
    s = s
      .. statusline_append(
        warns,
        statusline_combine_hi('StatusLineDiagnostics', 'DiagnosticWarn'),
        default_hi
      )
  end
  return vim.trim(s)
end

function _G.statusline_ts()
  local navic = package.loaded['nvim-navic']
  if not navic then
    return ''
  end
  local data = navic.get_data()
  if not data then
    return ''
  end
  local s = {}
  for i = 1, #data do
    table.insert(
      s,
      string.format(
        '%%#CmpItemKind%s#%s%%* %%#StatusLine#%s%%*',
        data[i].type,
        data[i].icon,
        data[i].name
      )
    )
  end
  return table.concat(s, ' > ')
end

function _G.statusline_lspstatus()
  local lst = package.loaded['lsp-status']
  if not lst then
    return ''
  end
  return vim.trim(lst.status())
end

function _G.statusline_spinner(bufnr)
  local sp = package.loaded.spinner
  if not sp then
    return ''
  end
  return sp.status(bufnr)
end

function _G.statusline_dap()
  local dap = package.loaded.dap
  if not dap then
    return ''
  end
  local s = dap.status()
  if s == '' then
    return s
  end
  return '[DAP: ' .. s .. ']'
end

function _G.statusline_notify(default_hi)
  if not _G.statusline_notifications or #_G.statusline_notifications == 0 then
    return ''
  end
  local n = _G.statusline_notifications[1]
  local timeout = (n.options and n.options.timeout) or 2000
  -- pop message after <timeout> and move to archive
  vim.defer_fn(function()
    local n_ = table.remove(_G.statusline_notifications, 1)
    table.insert(_G.statusline_notifications_archive, n_)
    -- make sure archive is never longer than 20 notifications
    if #_G.statusline_notifications_archive > 20 then
      table.remove(_G.statusline_notifications_archive, 1)
    end
  end, timeout)

  local s = ''
  if n.hi then
    s = s
      .. statusline_append(
        n.lvl_string .. ' ',
        statusline_combine_hi('StatusLineNotify', n.hi),
        default_hi,
        { append_space = false }
      )
  end
  s = s .. statusline_append(vim.inspect(n.message), 'StatusLineNotify', default_hi)
  return vim.trim(s)
end

vim.opt.statusline = '%{%v:lua.statusline()%}'

-- WINBAR --
-- vim.opt.winbar = [[%h%w%q%f %-m %-r %= %#WinBarCwd#%{%getcwd()%}%*]] -- keep it simple
-- function _G.winbar()
--   return [[%<%F %-m %-r]]
-- end
-- vim.opt.winbar = '%{%v:lua.winbar()%}'