-- 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")
pcall(require, 'guihua') -- lazy load
local guihua = require('guihua.util')
local nvim_0_8
local vfn = vim.fn
local api = vim.api
local uv = vim.uv or vim.loop

local os_name = uv.os_uname().sysname
local is_win = os_name:find('Windows') or os_name:find('MINGW')
M.path_sep = function()
  if is_win then
    return '\\'
  else
    return '/'
  end
end

local path_sep = M.path_sep()

M.path_cur = function()
  if is_win then
    return '.\\'
  else
    return './'
  end
end

M.round = function(x, r)
  r = r or 0.5
  return math.max(0, math.floor(x - r))
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 api.nvim_buf_is_loaded(bufnr) then
    vfn.bufload(bufnr)
  end
  local data = 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

function M.io_read(filename)
  local f = io.open(filename, 'r')
  if f == nil then
    return nil
  end
  local content = f:read('*a') -- *a or *all reads the whole file
  f:close()
  return content
end

function M.rm_file(filename)
  return os.remove(filename)
end

function M.file_exists(name)
  local f = io.open(name, 'r')
  if f ~= nil then
    io.close(f)
    return true
  end
  return false
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
      api.nvim_buf_set_keymap(0, modes[i], key, result, options)
    else
      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
  return ''
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)
  M.trace('rel path', base_path, my_path)
  base_path = string.lower(base_path)
  my_path = string.lower(my_path)
  local base_data = getDir(base_path)
  if base_data == nil then
    M.log('base data is nil')
    return
  end
  local my_data = getDir(my_path)
  if vim.fn.empty(my_data) == 1 then
    M.log('my data is nil', my_path)
    return
  end
  local base_len = #base_data
  local my_len = #my_data

  if base_len > my_len then
    M.log('incorrect dir format: base data', base_data, 'my data', my_data)
    return my_path
  end

  if base_data[1] ~= my_data[1] then
    M.log('base data is not same', base_data[1], my_data[1])
    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

M.log = function(...)
  return { ... }
end
M.trace = function(...)
  return { ... }
end

local level = 'info'

function M.setup()
  if _NgConfigValues.debug == true then
    level = 'debug'
  elseif _NgConfigValues.debug == 'trace' then
    level = 'trace'
  end
  local default_config =
    { use_console = false, use_file = true, level = level, plugin = 'navigator' }
  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)
  if _NgConfigValues.debug then
    -- add log to you lsp.log
    M.trace = M._log.trace
    M.info = M._log.info
    M.warn = M._log.warn
    M.error = M._log.error
    M.log = M.info
  end
end

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
if not table.pack then
  table.pack = function(...)
    return { n = select('#', ...), ... }
  end
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)
  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 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_8()
  if nvim_0_8 ~= nil then
    return nvim_0_8
  end
  nvim_0_8 = vfn.has('nvim-0.8') == 1
  if nvim_0_8 == false then
    M.log('Please use navigator 0.4 version for neovim version < 0.8')
    vim.notify('Please use navigator 0.4 version for neovim version < 0.8', vim.log.levels.ERROR)
  end
  return nvim_0_8
end

function M.mk_handler(fn)
  return function(...)
    return fn(...)
  end
end

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

function M.partial2(func, arg1, arg2)
  return function(...)
    return func(arg1, arg2, ...)
  end
end

function M.partial3(func, arg1, arg2, arg3)
  return function(...)
    return func(arg1, arg2, arg3, ...)
  end
end

function M.partial4(func, arg1, arg2, arg3, arg4)
  return function(...)
    return func(arg1, arg2, arg3, arg4, ...)
  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
    return oe[1]
  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.log.levels.WARN)
end

function M.error(msg)
  vim.notify('ERR: ' .. msg, vim.log.levels.EROR)
end

function M.info(msg)
  vim.notify('INF: ' .. msg, vim.log.levels.INFO)
end

function M.dedup(locations)
  local m = math.min(10, #locations) -- dedup first 10 elements
  local dict = {}
  local del = {}
  for i = 1, m, 1 do
    local value = locations[i]
    local range = value.range or value.originSelectionRange or value.targetRange
    if not range then
      break
    end
    local key = (value.uri or range.uri or value.targetUri or '')
      .. ':'
      .. tostring(range.start.line)
      .. ':'
      .. tostring(range.start.character)
      .. ':'
      .. tostring(range['end'].line)
      .. ':'
      .. tostring(range['end'].character)
    if dict[key] == nil then
      dict[key] = i
    else
      local j = dict[key]
      if not locations[j].definition then
        table.insert(del, i)
      else
        table.insert(del, j)
      end
    end
  end
  table.sort(del)
  for i = #del, 1, -1 do
    M.log('remove ', del[i])
    table.remove(locations, del[i])
  end
  return locations
end

function M.range_inside(outer, inner)
  if outer == nil or inner == nil then
    return false
  end
  if outer.start == nil or outer['end'] == nil or inner.start == nil or inner['end'] == nil then
    return false
  end
  return outer.start.line <= inner.start.line and outer['end'].line >= inner['end'].line
end

function M.dirname(pathname)
  local strip_dir_pat = path_sep .. '([^' .. path_sep .. ']+)$'
  local strip_sep_pat = path_sep .. '$'
  if not pathname or #pathname == 0 then
    return
  end
  local result = pathname:gsub(strip_sep_pat, ''):gsub(strip_dir_pat, '')
  if #result == 0 then
    return '/'
  end
  return result
end

function M.sub_match(str)
  local _, j = string.gsub(str, [["]], '')
  if j % 2 == 1 then
    str = str .. '"'
  end
  _, j = string.gsub(str, [[']], '')
  if j % 2 == 1 then
    str = str .. [[']]
  end
  str = str .. '󰇘'
  return str
end

function M.try_trim_markdown_code_blocks(lines)
  local language_id = lines[1]:match('^```(.*)')
  if language_id then
    local has_inner_code_fence = false
    for i = 2, (#lines - 1) do
      local line = lines[i]
      if line:sub(1, 3) == '```' then
        has_inner_code_fence = true
        break
      end
    end
    -- No inner code fences + starting with code fence = hooray.
    if not has_inner_code_fence then
      table.remove(lines, 1)
      table.remove(lines)
      return language_id
    end
  end
  return 'markdown'
end

function M.trim_empty_lines(lines)
  local new_list = {}
  for i, str in ipairs(lines) do
    if str ~= '' and str then
      table.insert(new_list, str)
    end
  end
  return new_list
end

function M.for_each_buffer_client(bufnr, fn)
  local clients
  if vim.lsp.get_clients then -- nightly nvim 0.10
    clients = vim.lsp.get_clients({ bufnr = bufnr })
  else
    clients = vim.lsp.buf_get_clients()
  end
  for _, client in pairs(clients) do
    fn(client, client.id, bufnr)
  end
end

function M.binding_remap(fn, key)
  return function(...)
    if fn(...) ~= true and key then -- the function failed fallback to key
      M.log(key)
      vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes(key, true, false, true), 'n', true)
    end
  end
end

function M.mk_handler_remap(fn, fallback)
  return function(...)
    if fn(...) ~= true then -- the function failed fallback to key
      M.log('fallback, ', fallback)
      if fallback then
        M.log('fallback')
        fallback()
      end
    end
  end
end

return M