local gcm = require'presser.context_manager'
--local actions = require'presser.actions'
local utils = require'presser.utils'

local a = vim.api

local actions = {}

-- :@Dev: close all Presser windows that may be open for all contexts
actions.close = function ()
  gcm.flush() -- invoke the context manager to flush the table
end

actions.move_next_buffer = function ()
  local ctxs = 0
  local c = gcm.get_global_context_manager()
  local buf = a.nvim_get_current_buf()

  for _, v in pairs( c ) do for idx, _ in pairs( v ) do ctxs = idx end end

  for _, ctx_obj in pairs( c ) do
    for idx, obj in pairs( ctx_obj ) do
      if a.nvim_win_get_buf( obj.id ) == buf then
        -- get the next window, and put cursor there
        local s = idx
        repeat
          local win = ctx_obj[(idx % ctxs) + 1]
          if win.allowed then
            a.nvim_set_current_win( ctx_obj[(idx % ctxs) + 1].id )
            break
          end
          idx = (idx % ctxs) + 1
        until s == idx
      end
    end
  end
end

local read_buffer = function ()
  local c = vim.g.presser_buf_ctx

  local b = {}
  for _, ctx_obj in pairs( c ) do
    for _, obj in pairs( ctx_obj ) do
      if obj.allowed then
        local buf = a.nvim_win_get_buf( obj.id )
        table.insert(b, utils.clean_buf( a.nvim_buf_get_lines( buf, 0, -1, false )[1] ))
      end
    end
  end

  return b
end

actions.execute = function ()
  local result = read_buffer()
  actions.close()

  local cmd = ":%s/" .. result[1] .. "/" .. result[2] .. "/g"
  a.nvim_exec( cmd, false )
end

actions.hyperlink_exec = function ()
  local url = utils.clean_buf(read_buffer()[1])
  actions.close()

  if url == "" then return nil end

  local _, cur_start, _, cur_end = utils.get_selection()
  local line = a.nvim_get_current_line()
  if line == "" then
    return
  end

  local row, col = unpack(a.nvim_win_get_cursor(0))
  if cur_start == -1 then
    cur_start, cur_end = unpack(utils.subslice(line .. " ", col))
  end

  actions.suburl( line, row, url, cur_start, cur_end )
end

actions.suburl = function (line, row, url, cur_start, cur_end)
  local prefix = string.sub(line, 1, cur_start) -- the first part up to selection
  local suffix = string.sub(line, cur_end + 1, line:len()) -- the last part after selection
  local infix = "[" .. utils.clean_buf(string.sub(line, cur_start, cur_end)) .. "]" .. "(" .. url .. ")"

  a.nvim_buf_set_lines( 0, row-1, row, false, { prefix .. infix .. suffix }  )
end

actions.buf_put_curser_at = function ( label )
  for _, ctx_obj in pairs( vim.g.presser_buf_ctx ) do
    for _, record in pairs( ctx_obj ) do
      if record.what == label then
        a.nvim_set_current_win( record.id )
      end
    end
  end
end

return actions