local config = require('muwiki.config')
local paths = require('muwiki.paths')
local fs = require('muwiki.fs')

local M = {}

function M.open_in_buffer(filepath)
  local bufnr = vim.fn.bufnr(filepath, true)
  vim.api.nvim_win_set_buf(0, bufnr)
end

function M.open_external(url)
  if type(url) ~= 'string' then
    vim.notify('Invalid URL type', vim.log.levels.ERROR)
    return false
  end

  local valid, err = paths.validate_url_scheme(url)
  if not valid then
    vim.notify(err, vim.log.levels.ERROR)
    return false
  end

  vim.system({ 'xdg-open', url }, { detach = true })
  return true
end

function M.open_index(name)
  local wiki_path = config.wiki_path(name)
  if not wiki_path then
    return
  end

  local index_path = vim.fs.joinpath(wiki_path, config.options.index_file)
  M.open_in_buffer(index_path)
end

function M.resolve(filepath, wiki_root)
  if not wiki_root then
    error('wiki_root parameter is required for secure path resolution')
  end

  local path = paths.strip_file_protocol(filepath)

  local resolved = paths.resolve(path, wiki_root)

  return paths.validate_within_wiki(resolved, wiki_root, filepath)
end

function M.is_text_file(ext)
  local ext_lower = ext:lower()
  for _, text_ext in ipairs(config.options.text_extensions) do
    if ext_lower == text_ext then
      return true
    end
  end
  return false
end

function M.normalize_filename(text)
  local normalized = text:lower()
  normalized = normalized:gsub('%s+', '_')
  normalized = normalized:gsub('[^%w_%-%.]', '')
  return normalized
end

function M.open_wiki_file(filepath)
  local templates = require('muwiki.templates')

  local exists = fs.file_exists(filepath)

  if not exists and config.options.create_missing_dirs then
    local wiki_root = config.wiki_root(0)
    if wiki_root then
      local mode = config.options.create_missing_dirs

      if mode == 'prompt' then
        fs.ensure_parent_dirs(filepath, wiki_root, mode, function(success)
          if success then
            M.open_in_buffer(filepath)
            templates.init_file(vim.api.nvim_get_current_buf(), filepath)
          end
        end)
        return
      else
        local success = fs.ensure_parent_dirs(filepath, wiki_root, mode)
        if not success then
          return
        end
      end
    end
  end

  M.open_in_buffer(filepath)
  templates.init_file(vim.api.nvim_get_current_buf(), filepath)
end

return M