-- Actions functions that are useful for people creating their own mappings.

local a = vim.api

local log = require('telescope.log')
local state = require('telescope.state')
local utils = require('telescope.utils')
local p_scroller = require('telescope.pickers.scroller')

local action_state = require('telescope.actions.state')
local action_set = require('telescope.actions.set')

local transform_mod = require('telescope.actions.mt').transform_mod

local actions = setmetatable({}, {
  __index = function(_, k)
    -- TODO(conni2461): Remove deprecated messages
    if k:find('goto_file_selection') then
      error("`" .. k .. "` is removed and no longer usable. " ..
        "Use `require('telescope.actions').select_` instead. Take a look at developers.md for more Information.")
    elseif k == '_goto_file_selection' then
      error("`_goto_file_selection` is deprecated and no longer replaceable. " ..
        "Use `require('telescope.actions.set').edit` instead. Take a look at developers.md for more Information.")
    end

    error("Key does not exist for 'telescope.actions': " .. tostring(k))
  end
})

-- TODO(conni2461): Remove deprecated messages
local action_is_deprecated = function(name, err)
  local messager = err and error or log.info

  return messager(
    string.format("`actions.%s()` is deprecated."
      .. "Use require('telescope.actions.state').%s() instead",
      name,
      name
    )
  )
end

--- Get the current entry
function actions.get_selected_entry()
  -- TODO(1.0): Remove
  action_is_deprecated("get_selected_entry")
  return action_state.get_selected_entry()
end

function actions.get_current_line()
  -- TODO(1.0): Remove
  action_is_deprecated("get_current_line")
  return action_state.get_current_line()
end

--- Get the current picker object for the prompt
function actions.get_current_picker(prompt_bufnr)
  -- TODO(1.0): Remove
  action_is_deprecated("get_current_picker")
  return action_state.get_current_picker(prompt_bufnr)
end

--- Move the selection to the next entry
function actions.move_selection_next(prompt_bufnr)
  action_set.shift_selection(prompt_bufnr, 1)
end

--- Move the selection to the previous entry
function actions.move_selection_previous(prompt_bufnr)
  action_set.shift_selection(prompt_bufnr, -1)
end

function actions.move_to_top(prompt_bufnr)
  local current_picker = actions.get_current_picker(prompt_bufnr)
  current_picker:set_selection(p_scroller.top(current_picker.sorting_strategy,
    current_picker.max_results,
    current_picker.manager:num_results()
  ))
end

function actions.move_to_middle(prompt_bufnr)
  local current_picker = actions.get_current_picker(prompt_bufnr)
  current_picker:set_selection(p_scroller.middle(
    current_picker.sorting_strategy,
    current_picker.max_results,
    current_picker.manager:num_results()
  ))
end

function actions.move_to_bottom(prompt_bufnr)
  local current_picker = actions.get_current_picker(prompt_bufnr)
  current_picker:set_selection(p_scroller.bottom(current_picker.sorting_strategy,
    current_picker.max_results,
    current_picker.manager:num_results()
  ))
end

function actions.add_selection(prompt_bufnr)
  local current_picker = action_state.get_current_picker(prompt_bufnr)
  current_picker:add_selection(current_picker:get_selection_row())
end

function actions.remove_selection(prompt_bufnr)
  local current_picker = action_state.get_current_picker(prompt_bufnr)
  current_picker:remove_selection(current_picker:get_selection_row())
end

function actions.toggle_selection(prompt_bufnr)
  local current_picker = action_state.get_current_picker(prompt_bufnr)
  current_picker:toggle_selection(current_picker:get_selection_row())
end

function actions.preview_scrolling_up(prompt_bufnr)
  -- TODO: Make number configurable.
  action_state.get_current_picker(prompt_bufnr).previewer:scroll_fn(-30)
end

function actions.preview_scrolling_down(prompt_bufnr)
  -- TODO: Make number configurable.
  action_state.get_current_picker(prompt_bufnr).previewer:scroll_fn(30)
end

function actions.center(_)
  vim.cmd(':normal! zz')
end

function actions.select_default(prompt_bufnr)
  return action_set.select(prompt_bufnr, "default")
end

function actions.select_horizontal(prompt_bufnr)
  return action_set.select(prompt_bufnr, "horizontal")
end

function actions.select_vertical(prompt_bufnr)
  return action_set.select(prompt_bufnr, "vertical")
end

function actions.select_tab(prompt_bufnr)
  return action_set.select(prompt_bufnr, "tab")
end

-- TODO: consider adding float!
-- https://github.com/nvim-telescope/telescope.nvim/issues/365

function actions.file_edit(prompt_bufnr)
  return action_set.edit(prompt_bufnr, "edit")
end

function actions.file_split(prompt_bufnr)
  return action_set.edit(prompt_bufnr, "new")
end

function actions.file_vsplit(prompt_bufnr)
  return action_set.edit(prompt_bufnr, "vnew")
end

function actions.file_tab(prompt_bufnr)
  return action_set.edit(prompt_bufnr, "tabedit")
end

function actions.close_pum(_)
  if 0 ~= vim.fn.pumvisible() then
    vim.api.nvim_feedkeys(vim.api.nvim_replace_termcodes("<c-y>", true, true, true), 'n', true)
  end
end

local do_close = function(prompt_bufnr, keepinsert)
  local picker = action_state.get_current_picker(prompt_bufnr)
  local prompt_win = state.get_status(prompt_bufnr).prompt_win
  local original_win_id = picker.original_win_id

  if picker.previewer then
    picker.previewer:teardown()
  end

  actions.close_pum(prompt_bufnr)
  if not keepinsert then
    vim.cmd [[stopinsert]]
  end

  vim.api.nvim_win_close(prompt_win, true)

  pcall(vim.cmd, string.format([[silent bdelete! %s]], prompt_bufnr))
  pcall(a.nvim_set_current_win, original_win_id)
end

function actions.close(prompt_bufnr)
  do_close(prompt_bufnr, false)
end

actions.set_command_line = function(prompt_bufnr)
  local entry = action_state.get_selected_entry(prompt_bufnr)

  actions.close(prompt_bufnr)
  vim.fn.histadd("cmd", entry.value)
  vim.cmd(entry.value)
end

actions.edit_register = function(prompt_bufnr)
  local entry = action_state.get_selected_entry(prompt_bufnr)
  local picker = action_state.get_current_picker(prompt_bufnr)

  vim.fn.inputsave()
  local updated_value = vim.fn.input("Edit [" .. entry.value .. "] ❯ ", entry.content)
  vim.fn.inputrestore()
  if updated_value ~= entry.content then
    vim.fn.setreg(entry.value, updated_value)
    entry.content = updated_value
  end

  -- update entry in results table
  -- TODO: find way to redraw finder content
  for _, v in pairs(picker.finder.results) do
    if v == entry then
      v.content = updated_value
    end
  end
  -- print(vim.inspect(picker.finder.results))
end

actions.paste_register = function(prompt_bufnr)
  local entry = action_state.get_selected_entry(prompt_bufnr)

  actions.close(prompt_bufnr)

  -- ensure that the buffer can be written to
  if vim.api.nvim_buf_get_option(vim.api.nvim_get_current_buf(), "modifiable") then
    print("Paste!")
    -- substitute "^V" for "b"
    local reg_type = vim.fn.getregtype(entry.value)
    if reg_type:byte(1, 1) == 0x16 then
      reg_type = "b" .. reg_type:sub(2, -1)
    end
    vim.api.nvim_put({entry.content}, reg_type, true, true)
  end
end

actions.run_builtin = function(prompt_bufnr)
  local entry = action_state.get_selected_entry(prompt_bufnr)

  do_close(prompt_bufnr, true)
  require('telescope.builtin')[entry.text]()
end

actions.insert_symbol = function(prompt_bufnr)
  local selection = action_state.get_selected_entry()
  actions.close(prompt_bufnr)
  vim.api.nvim_put({selection.value[1]}, '', true, true)
end

-- TODO: Think about how to do this.
actions.insert_value = function(prompt_bufnr)
  local entry = action_state.get_selected_entry(prompt_bufnr)

  vim.schedule(function()
    actions.close(prompt_bufnr)
  end)

  return entry.value
end

actions.git_checkout = function(prompt_bufnr)
  local cwd = action_state.get_current_picker(prompt_bufnr).cwd
  local selection = action_state.get_selected_entry()
  actions.close(prompt_bufnr)
  utils.get_os_command_output({ 'git', 'checkout', selection.value }, cwd)
end

actions.git_staging_toggle = function(prompt_bufnr)
  local cwd = action_state.get_current_picker(prompt_bufnr).cwd
  local selection = action_state.get_selected_entry()

  if selection.status:sub(2) == ' ' then
    utils.get_os_command_output({ 'git', 'restore', '--staged', selection.value }, cwd)
  else
    utils.get_os_command_output({ 'git', 'add', selection.value }, cwd)
  end
end

local entry_to_qf = function(entry)
  return {
    bufnr = entry.bufnr,
    filename = entry.filename,
    lnum = entry.lnum,
    col = entry.col,
    text = entry.value,
  }
end

actions.send_selected_to_qflist = function(prompt_bufnr)
  local picker = action_state.get_current_picker(prompt_bufnr)

  local qf_entries = {}
  for entry in pairs(picker.multi_select) do
    table.insert(qf_entries, entry_to_qf(entry))
  end

  actions.close(prompt_bufnr)

  vim.fn.setqflist(qf_entries, 'r')
end

actions.send_to_qflist = function(prompt_bufnr)
  local picker = action_state.get_current_picker(prompt_bufnr)
  local manager = picker.manager

  local qf_entries = {}
  for entry in manager:iter() do
    table.insert(qf_entries, entry_to_qf(entry))
  end

  actions.close(prompt_bufnr)

  vim.fn.setqflist(qf_entries, 'r')
end

actions.open_qflist = function(_)
  vim.cmd [[copen]]
end

-- ==================================================
-- Transforms modules and sets the corect metatables.
-- ==================================================
actions = transform_mod(actions)
return actions