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_git(bufnr, hi), 'StatusLineGit', hi)

  sl = sl .. statusline_append(statusline_grapple(bufnr, hi), 'StatusLineGrapple', hi)

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

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

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

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

  sl = sl .. statusline_append(statusline_spinner(bufnr, hi), '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(0, { name = outer_name, create = false })
  local inner = vim.api.nvim_get_hl(0, { name = inner_name, create = false })
  -- try to find a predefined hl
  local name = (outer_name .. inner_name)
  if vim.api.nvim_get_hl(0, { name = name, create = false }) then
    return name
  end
  -- generate one new one automatically
  name = ('autohi_' .. outer_name .. inner_name)
  vim.api.nvim_get_hl(0, { name = name, create = true })
  local hi = vim.tbl_extend('force', inner, { bg = inner.fg }, { fg = outer.bg })
  vim.api.nvim_set_hl(0, name, hi)
  return name
end

function _G.statusline_lsp_diagnostics(bufnr, default_hi)
  local signs = vim.diagnostic.config().signs.text or {}
  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 = signs[vim.diagnostic.severity.ERROR] .. ' ' .. #error_num
    s = s
      .. statusline_append(errs, statusline_combine_hi('StatusLine', 'DiagnosticError'), default_hi)
  end
  if #warn_num > 0 then
    local warns = signs[vim.diagnostic.severity.WARN] .. ' ' .. #warn_num
    s = s
      .. statusline_append(warns, statusline_combine_hi('StatusLine', 'DiagnosticWarn'), default_hi)
  end
  return vim.trim(s)
end

function _G.statusline_git(_, hi)
  if vim.b.gitsigns_status and vim.b.gitsigns_status ~= '' then
    return statusline_append('[' .. vim.b.gitsigns_status .. ']', 'StatusLineGitChanges', hi)
  end
end

function _G.statusline_grapple(_, _)
  local g = package.loaded.grapple
  if not g then
    return ''
  end
  return g.statusline()
  -- if not g or not g.exists({ buffer = bufnr }) then
  --   return ''
  -- end
  -- return '➥ ' .. g.key({ buffer = bufnr })
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

local hi = function(name, opts)
  vim.api.nvim_set_hl(0, name, opts)
end

local statusline = vim.api.nvim_get_hl(0, { name = 'StatusLine', create = false })
hi('StatusLineDiagnosticError', { fg = 'NvimDarkRed', bg = statusline.bg, bold = true })
hi('StatusLineDiagnosticWarn', { fg = 'NvimDarkYellow', bg = statusline.bg, bold = true })

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()%}'