-- misc stuff implemented in lua

local M = {}

local function get_visual_selection()
  local top = vim.fn.getpos("'<")
  top = { ln = top[2], col = top[3] }
  local bot = vim.fn.getpos("'>")
  bot = { ln = bot[2], col = bot[3] }
  local lines = vim.api.nvim_buf_get_lines(0, (top.ln - 1), bot.ln, false)
  if vim.opt.selection:get() == 'inclusive' then
    lines[#lines] = lines[#lines]:sub(1, bot.col)
  else
    lines[#lines] = lines[#lines]:sub(1, (bot.col - 1))
  end
  lines[1] = lines[1]:sub(top.col)
  return top, bot, lines
end

function M.sort_lines(_, preview_ns, preview_bufnr)
  local bufnr = vim.api.nvim_get_current_buf()

  local top, bot, lines = get_visual_selection()
  for i = 1, #lines do
    lines[i] = vim.fn.join(vim.fn.sort(vim.fn.split(lines[i], ' ')))
  end

  if not preview_ns then
    vim.api.nvim_buf_set_lines(bufnr, top.ln - 1, bot.ln, false, lines)
    vim.notify('no preview')
    return 0
  end

  -- inccommand preview
  if preview_ns ~= nil then
    for i, line in ipairs(lines) do
      vim.api.nvim_buf_set_extmark(bufnr, preview_ns, top.ln + i - 2, 0, {
        hl_mode = 'combine',
        virt_text_pos = 'overlay',
        virt_text = { { line, 'Substitute' } },
      })

      if preview_bufnr ~= nil then
        local prefix = string.format('|%d| ', top.ln + i - 1)
        vim.api.nvim_buf_set_lines(preview_bufnr, i - 1, -1, false, { prefix .. line })
        vim.api.nvim_buf_add_highlight(
          preview_bufnr,
          preview_ns,
          'Substitute',
          i,
          #prefix,
          #prefix + #line
        )
      end
    end
    return (#lines > 1 and 2 or 1)
  end
end

local get_searchdirs = function(dirs)
  if type(dirs) == 'table' and #dirs > 0 then
    return dirs
  elseif type(dirs) == 'string' and not (dirs == '') then
    dirs = vim.split(dirs, ',')
  end
  -- skip asking if we're looking at known filetypes
  local ft = vim.api.nvim_buf_get_option(0, 'filetype')
  if #dirs == 0 and (ft == 'dirbuf' or ft == 'alpha') then
    dirs = { '%:p:h' }
  end
  -- ask user
  if #dirs == 0 then
    vim.ui.input({ prompt = 'Search directories: ' }, function(result)
      dirs = { result }
    end)
  end
  -- default to something reasonable
  if #dirs == 0 then
    dirs = { '%:p:h' }
  end
  -- finally return
  for i = 1, #dirs do
    dirs[i] = vim.fn.expand(dirs[i])
  end
  return dirs
end

local function onchoice(opts, cb)
  if not cb then
    return
  end
  opts.attach_mappings = function(prompt_bufnr)
    require('telescope.actions').select_default:replace(function()
      local selection = require('telescope.actions.state').get_selected_entry()
      if selection == nil then
        return
      end
      require('telescope.actions').close(prompt_bufnr)
      cb(selection.path)
    end)
    return true
  end
end

function M.live_grep(dirs, opts, cb)
  opts = opts or {}
  local search_dirs = get_searchdirs(dirs)
  opts.search_dirs = search_dirs
  opts.prompt_title = 'Grep: ' .. vim.inspect(search_dirs)
  onchoice(opts, cb)
  require('telescope.builtin').live_grep(opts)
end

function M.find_files(dirs, opts, cb)
  -- convenience aliases
  if dirs == 'plugins' then
    dirs = vim.fn.stdpath('data') .. '/site/pack/'
  end

  opts = opts or {}
  local search_dirs = dirs
  if type(dirs) == 'string' then
    search_dirs = get_searchdirs(dirs)
  end
  opts.search_dirs = search_dirs
  opts.prompt_title = 'Find: ' .. vim.inspect(search_dirs)
  onchoice(opts, cb)
  require('telescope.builtin').find_files(opts)
end

function M.fold_block() -- {{{
  local Comment = require('Comment.api')
  local m = vim.api.nvim_buf_get_mark
  local inital_cusor_pos = vim.api.nvim_win_get_cursor(0)
  local spos, epos = m(0, '<'), m(0, '>')

  -- do start of selection
  vim.api.nvim_win_set_cursor(0, spos)
  Comment.insert_linewise_eol()
  vim.api.nvim_feedkeys('\\<esc>', 'ni', true)
  local sln = vim.api.nvim_get_current_line()
  vim.api.nvim_set_current_line(sln .. '{{{')

  -- do end of selection
  vim.api.nvim_win_set_cursor(0, epos)
  Comment.insert_linewise_eol()
  vim.api.nvim_feedkeys('\\<esc>', 'ni', true)
  local eln = vim.api.nvim_get_current_line()
  vim.api.nvim_set_current_line(eln .. '}}}')

  -- restore initial cursor postition
  vim.api.nvim_win_set_cursor(0, inital_cusor_pos)
end -- }}}

function M.link_preview()
  local link = vim.fn.expand('<cfile>')
  if not link then
    return
  end

  local buf = vim.api.nvim_get_current_buf()
  local ln = vim.api.nvim_win_get_cursor(0)[1] - 1

  require('job')
      .jobstart({
        format_title = function()
          return 'link-preview'
        end,
        command = vim.env.SHELL,
        args = {
          '-c',
          [[ curl -sSfL ]]
          .. link
          .. [[ | grep -iPo '(?<=property="og:title" content=")([^\"]+)(?=")' ]],
        },
        populate_quickfix = false,
        enable_recording = true,
      })
      :after_success(vim.schedule_wrap(function(j, code, _)
        local results = j:result()
        if not code == 0 or #results == 0 then
          return
        end

        local ns = vim.api.nvim_create_namespace('')
        vim.api.nvim_buf_set_extmark(buf, ns, ln, 0, {
          virt_text = { { results[1], 'Error' } },
          virt_text_pos = 'eol',
        })
      end))
end

function M.setup(opts)
  opts = opts or {}

  if opts.sortline then
    vim.api.nvim_create_user_command(
      'SortLine',
      M.sort_lines,
      { desc = 'sort line', range = '%', preview = M.sort_lines }
    )
  end
  if opts.grep then
    vim.api.nvim_create_user_command('Grep', function(o)
      M.live_grep(table.concat(o.fargs))
    end, {
      desc = 'live grep (rg)',
      nargs = '*',
      complete = 'dir',
    })
  end
  if opts.find then
    vim.api.nvim_create_user_command('Find', function(o)
      M.find_files(table.concat(o.fargs))
    end, {
      desc = 'find files (fd)',
      nargs = '*',
      complete = 'dir',
    })
  end
end

return M