-- retreives data form file
-- and line to highlight
-- Some of function copied from https://github.com/RishabhRD/nvim-lsputils
local M = { log_path = vim.lsp.get_log_path() }
-- local is_windows = uv.os_uname().version:match("Windows")
local guihua = require('guihua.util')
local nvim_0_6_1

M.path_sep = function()
  local is_win = vim.loop.os_uname().sysname:find('Windows')
  if is_win then
    return '\\'
  else
    return '/'
  end
end

local path_sep = M.path_sep()

M.path_cur = function()
  local is_win = vim.loop.os_uname().sysname:find('Windows')
  if is_win then
    return '.\\'
  else
    return './'
  end
end

M.round = function(x)
  return math.max(0, math.floor(x - 0.5))
end

function M.get_data_from_file(filename, startLine)
  local displayLine
  if startLine < 3 then
    displayLine = startLine
    startLine = 0
  else
    startLine = startLine - 2
    displayLine = 2
  end
  local uri = 'file:///' .. filename
  local bufnr = vim.uri_to_bufnr(uri)
  if not vim.api.nvim_buf_is_loaded(bufnr) then
    vim.fn.bufload(bufnr)
  end
  local data = vim.api.nvim_buf_get_lines(bufnr, startLine, startLine + 8, false)
  if data == nil or vim.tbl_isempty(data) then
    startLine = nil
  else
    local len = #data
    startLine = startLine + 1
    for i = 1, len, 1 do
      data[i] = startLine .. ' ' .. data[i]
      startLine = startLine + 1
    end
  end
  return { data = data, line = displayLine }
end

M.merge = function(t1, t2)
  for k, v in pairs(t2) do
    t1[k] = v
  end
  return t1
end

M.map = function(modes, key, result, options)
  options = M.merge({ noremap = true, silent = false, expr = false, nowait = false }, options or {})
  local buffer = options.buffer
  options.buffer = nil

  if type(modes) ~= 'table' then
    modes = { modes }
  end

  for i = 1, #modes do
    if buffer then
      vim.api.nvim_buf_set_keymap(0, modes[i], key, result, options)
    else
      vim.api.nvim_set_keymap(modes[i], key, result, options)
    end
  end
end

function M.get_base(path)
  local len = #path
  for i = len, 1, -1 do
    if path:sub(i, i) == path_sep then
      local ret = path:sub(i + 1, len)
      return ret
    end
  end
end

local function getDir(path)
  local data = {}
  local len = #path
  if len <= 1 then
    return nil
  end
  local last_index = 1
  for i = 2, len do
    local cur_char = path:sub(i, i)
    if cur_char == path_sep then
      local my_data = path:sub(last_index + 1, i - 1)
      table.insert(data, my_data)
      last_index = i
    end
  end
  return data
end

function M.get_relative_path(base_path, my_path)
  local base_data = getDir(base_path)
  local my_data = getDir(my_path)
  local base_len = #base_data
  local my_len = #my_data

  if base_len > my_len then
    return my_path
  end

  if base_data[1] ~= my_data[1] then
    return my_path
  end

  local cur = 0
  for i = 1, base_len do
    if base_data[i] ~= my_data[i] then
      break
    end
    cur = i
  end
  local data = ''
  for i = cur + 1, my_len do
    data = data .. my_data[i] .. path_sep
  end
  data = data .. M.get_base(my_path)
  return data
end

local level = 'error'
if _NgConfigValues.debug == true then
  level = 'info'
elseif _NgConfigValues.debug == 'trace' then
  level = 'trace'
end
local default_config = { use_console = false, use_file = true, level = level }
if _NgConfigValues.debug_console_output then
  default_config.use_console = true
  default_config.use_file = false
end
M._log = require('guihua.log').new(default_config, true)

-- add log to you lsp.log
M.log = M._log.info
M.info = M._log.info
M.trace = M._log.trace
M.error = M._log.error

function M.fmt(...)
  M._log.fmt_info(...)
end

function M.split(inputstr, sep)
  if sep == nil then
    sep = '%s'
  end
  local t = {}
  for str in string.gmatch(inputstr, '([^' .. sep .. ']+)') do
    table.insert(t, str)
  end
  return t
end

function M.quickfix_extract(line)
  -- check if it is a line of file pos been selected
  local split = M.split
  line = vim.trim(line)
  local sep = split(line, ' ')
  if #sep < 2 then
    M.log(line)
    return nil
  end
  sep = split(sep[1], ':')
  if #sep < 3 then
    M.log(line)
    return nil
  end
  local location = {
    uri = 'file:///' .. sep[1],
    range = { start = { line = sep[2] - 3 > 0 and sep[2] - 3 or 1 } },
  }
  location.range['end'] = { line = sep[2] + 15 }
  return location
end

function M.getArgs(inputstr)
  local sep = '%s'
  local t = {}
  local cmd
  for str in string.gmatch(inputstr, '([^' .. sep .. ']+)') do
    if not cmd then
      cmd = str
    else
      table.insert(t, str)
    end
  end
  return cmd, t
end

function M.p(t)
  vim.notify(vim.inspect(t), vim.log.levels.INFO)
end

function M.printError(msg)
  vim.cmd('echohl ErrorMsg')
  vim.cmd(string.format([[echomsg '%s']], msg))
  vim.cmd('echohl None')
end

function M.reload()
  vim.lsp.stop_client(vim.lsp.get_active_clients())
  vim.cmd([[edit]])
end

function M.open_log()
  local path = vim.lsp.get_log_path()
  vim.cmd('edit ' .. path)
end

function table.pack(...)
  return { n = select('#', ...), ... }
end

function M.show(...)
  local string = ''

  local args = table.pack(...)

  for i = 1, args.n do
    string = string .. tostring(args[i]) .. '\t'
  end

  return string .. '\n'
end

function M.split2(s, sep)
  local fields = {}

  sep = sep or ' '
  local pattern = string.format('([^%s]+)', sep)
  string.gsub(s, pattern, function(c)
    fields[#fields + 1] = c
  end)

  return fields
end

function M.trim_and_pad(txt)
  local len = #txt
  if len <= 1 then
    return
  end
  local tab_en = txt[1] == '\t' or false
  txt = vim.trim(txt)
  if tab_en then
    if len - txt > 2 then
      return '    ' .. txt
    end
    if len - txt > 0 then
      return '  ' .. txt
    end
  end
  local rep = math.min(12, len - #txt)
  return string.rep('  ', rep / 4) .. txt
end

M.open_file = function(filename)
  vim.api.nvim_command(string.format('e! %s', filename))
end

M.open_file_at = guihua.open_file_at

function M.exists(var)
  for k, _ in pairs(_G) do
    if k == var then
      return true
    end
  end
end

local exclude_ft = { 'scrollbar', 'help', 'NvimTree' }
function M.exclude(fname)
  for i = 1, #exclude_ft do
    if string.find(fname, exclude_ft[i]) then
      return true
    end
  end
  return false
end

--- virtual text

-- name space search
local nss
local api = vim.api
local bufs

function M.set_virt_eol(bufnr, lnum, chunks, priority, id)
  if nss == nil then
    nss = api.nvim_create_namespace('navigator_search')
  end
  bufnr = bufnr == 0 and api.nvim_get_current_buf() or bufnr
  bufs[bufnr] = true
  -- id may be nil
  return api.nvim_buf_set_extmark(bufnr, nss, lnum, -1, { id = id, virt_text = chunks, priority = priority })
end

function M.clear_buf(bufnr)
  if not bufnr then
    return
  end
  bufnr = bufnr == 0 and api.nvim_get_current_buf() or bufnr
  if bufs[bufnr] then
    if api.nvim_buf_is_valid(bufnr) then
      api.nvim_buf_clear_namespace(bufnr, nss, 0, -1)
      -- nvim_buf_del_extmark
    end
    bufs[bufnr] = nil
  end
end

function M.clear_all_buf()
  for bufnr in pairs(bufs) do
    M.clear_buf(bufnr)
  end
  bufs = {}
end

function M.get_current_winid()
  return api.nvim_get_current_win()
end

function M.nvim_0_6_1()
  if nvim_0_6_1 ~= nil then
    return nvim_0_6_1
  end
  nvim_0_6_1 = vim.fn.has('nvim-0.6.1') == 1
  if nvim_0_6_1 == false then
    M.warn('Please use navigator 0.3 version for neovim version < 0.6.1')
  end
  return nvim_0_6_1
end

function M.mk_handler(fn)
  return function(...)
    if M.nvim_0_6_1() then
      return fn(...)
    end
  end
end

function M.partial(func, arg)
  return (M.mk_handler(function(...)
    return func(arg, ...)
  end))
end

function M.empty(t)
  if t == nil then
    return true
  end

  if type(t) ~= 'table' then
    return false
  end
  return next(t) == nil
end

function M.encoding(client)
  if client == nil then
    client = 1
  end

  if type(client) == 'number' then
    client = vim.lsp.get_client_by_id(client) or {}
  end
  local oe = client.offset_encoding
  if oe == nil then
    return 'utf-8'
  end
  if type(oe) == 'table' then
    oe = oe[1] or 'utf-8'
  end
  return oe
end

-- alternatively: use  vim.notify("namespace does not exist or is anonymous", vim.log.levels.ERROR)

function M.warn(msg)
  vim.notify('WRN: ' .. msg, vim.lsp.log_levels.WARN)
end

function M.error(msg)
  vim.notify('ERR: ' .. msg, vim.lsp.log_levels.EROR)
end

function M.info(msg)
  vim.notify('INF: ' .. msg, vim.lsp.log_levels.INFO)
end

return M