local spinner_ok, spinner = pcall(require, 'spinner')
if spinner_ok then
  spinner.setup {
    spinner = {'⠋', '⠙', '⠹', '⠸', '⠼', '⠴', '⠦', '⠧', '⠇', '⠏'},
    interval = 120, -- spinner frame rate in ms
  }
end

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 .. statusline_append(statusline_ts(),
    'StatusLineTreesitter', hi)

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

  sl = sl .. statusline_append(vim.trim(require('lsp-status').status()),
    'StatusLineLsp', hi)

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

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

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

  if spinner_ok then
    sl = sl .. statusline_append(spinner.status(bufnr),
      'StatusLineJobs', hi)
  end

  sl = sl .. statusline_append(require('nvim-lightbulb').get_status_text(),
    'StatusLineLightbulb', hi)

  sl = sl .. statusline_append([[ %l:%v --%p%%-- %y]], hi, hi)

  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

-- statusline_append
-- 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_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_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_ts()
  local data = require('nvim-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_dap()
  local dap_ok, dap = pcall(require, 'dap')
  if not dap_ok then return '' end

  local s = dap.status()
  if s == '' then return s end
  return '[DAP: ' .. s .. ']'
end

-- notifications cache
_G.statusline_notifications = {}
_G.statusline_notifications_archive = {}

function _G.statusline_notify(default_hi)
  if #_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(n.message, 'StatusLineNotify', default_hi)
  return vim.trim(s)
end

-- out vim.notify implementation
local notify = function(m, l, o)
  local lvl_string = l
  local hi = nil
  if l and type(l) == 'number' then
    if l == vim.log.levels.TRACE then
      hi = 'deEmph'
    elseif l == vim.log.levels.DEBUG then
      hi = 'DiagnosticHint'
    elseif l == vim.log.levels.INFO then
      hi = 'DiagnosticInfo'
    elseif l == vim.log.levels.WARN then
      hi = 'DiagnosticWarn'
    elseif l == vim.log.levels.ERROR then
      hi = 'DiagnosticError'
    end
    -- get level string
    lvl_string = vim.lsp.log_levels[l]
  end
  local display = m
  if lvl_string then display = lvl_string .. ' ' .. display end
  table.insert(_G.statusline_notifications, {
    message = m,
    level = l,
    options = o,
    lvl_string = lvl_string,
    hi = hi,
    display = display,
  })

  if _G.statusline_enable_notifysend then
    local args = {}
    if lvl_string then
      if lvl_string == 'ERROR' then
        table.insert(args, '--category=error')
      end
      if lvl_string == 'WARN' then
        table.insert(args, '--category=warning')
      end
    end
    table.insert(args, 'nvim')
    table.insert(args, display)
    require('job').jobstart { command = 'notify-send', args = args }
  end
end

-- overwrite vim.notify
vim.notify = function( m, l, o)
  if vim.in_fast_event() then
    vim.schedule(function()
      notify(m, l, o)
    end)
  else
    return notify(m, l, o)
  end
end

vim.keymap.set('n', '<leader>n', function()
  local pickers = require('telescope.pickers')
  local finders = require('telescope.finders')
  local conf = require('telescope.config').values
  local actions = require('telescope.actions')
  -- local action_state = require('telescope.actions.state')
  -- local previewers = require('telescope.previewers')

  local opts = {}
  pickers.new(opts, {
    prompt_title = "Notifications",
    finder = finders.new_dynamic {
      fn = function()
        return _G.statusline_notifications_archive
      end,
      entry_maker = function(n)
        return {
          value = n,
          display = n.display,
          ordinal = n.message,
        }
      end,
    },
    sorter = conf.generic_sorter(opts),
    attach_mappings = function(prompt_bufnr, _)
      actions.select_default:replace(function()
        actions.close(prompt_bufnr)
        -- noop
        -- local sel = action_state.get_selected_entry()
        -- vim.notify(sel.value.message, sel.value.level, sel.value.options)
      end)
      return true
    end,
    -- previewer = previewers.new_buffer_previewer {
    --   define_preview = function(self, entry)
    --     vim.api.nvim_buf_set_lines(self.state.bufnr, 0, -1, false, {entry.value.display})
    --   end,
    -- },
  }):find()
end, {desc='notifications'})

-- vim.opt.statusline = '%!luaeval("statusline()")'
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()%}'