local M = {}

function M.config()
  local lvim_dashboard = require "lvim.core.alpha.dashboard"
  local lvim_startify = require "lvim.core.alpha.startify"
  lvim.builtin.alpha = {
    dashboard = { config = {}, section = lvim_dashboard.get_sections() },
    startify = { config = {}, section = lvim_startify.get_sections() },
    active = true,
    mode = "dashboard",
  }
end

local function resolve_buttons(theme_name, entries)
  local selected_theme = require("alpha.themes." .. theme_name)
  local val = {}
  for _, entry in pairs(entries) do
    local on_press = function()
      local sc_ = entry[1]:gsub("%s", ""):gsub("SPC", "<leader>")
      local key = vim.api.nvim_replace_termcodes(sc_, true, false, true)
      vim.api.nvim_feedkeys(key, "normal", false)
    end
    local button_element = selected_theme.button(entry[1], entry[2], entry[3])
    -- this became necessary after recent changes in alpha.nvim (06ade3a20ca9e79a7038b98d05a23d7b6c016174)
    button_element.on_press = on_press
    table.insert(val, button_element)
  end
  return val
end

local function resolve_config(theme_name)
  local selected_theme = require("alpha.themes." .. theme_name)
  local resolved_section = selected_theme.section
  local section = lvim.builtin.alpha[theme_name].section

  for name, el in pairs(section) do
    for k, v in pairs(el) do
      if name:match "buttons" and k == "entries" then
        resolved_section[name].val = resolve_buttons(theme_name, v)
      elseif v then
        resolved_section[name][k] = v
      end
    end
  end

  return selected_theme.config
end

local function configure_additional_autocmds()
  local group = "_dashboard_settings"
  vim.api.nvim_create_augroup(group, {})
  vim.api.nvim_create_autocmd("FileType", {
    group = group,
    pattern = "alpha",
    command = "set showtabline=0 | autocmd BufLeave <buffer> set showtabline=" .. vim.opt.showtabline._value,
  })
  if not lvim.builtin.lualine.options.globalstatus then
    -- https://github.com/goolord/alpha-nvim/issues/42
    vim.api.nvim_create_autocmd("FileType", {
      group = group,
      pattern = "alpha",
      command = "set laststatus=0 | autocmd BufUnload <buffer> set laststatus=" .. vim.opt.laststatus._value,
    })
  end
end

function M.setup()
  local status_ok, alpha = pcall(require, "alpha")
  if not status_ok then
    return
  end
  local mode = lvim.builtin.alpha.mode
  local config = lvim.builtin.alpha[mode].config

  -- this makes it easier to use a completely custom configuration
  if vim.tbl_isempty(config) then
    config = resolve_config(mode)
  end

  alpha.setup(config)
  configure_additional_autocmds()
end

return M