local uv = vim.uv or vim.loop

local default_config = {
  -- Oil will take over directory buffers (e.g. `vim .` or `:e src/`)
  -- Set to false if you still want to use netrw.
  default_file_explorer = true,
  -- Id is automatically added at the beginning, and name at the end
  -- See :help oil-columns
  columns = {
    "icon",
    -- "permissions",
    -- "size",
    -- "mtime",
  },
  -- Buffer-local options to use for oil buffers
  buf_options = {
    buflisted = false,
    bufhidden = "hide",
  },
  -- Window-local options to use for oil buffers
  win_options = {
    wrap = false,
    signcolumn = "no",
    cursorcolumn = false,
    foldcolumn = "0",
    spell = false,
    list = false,
    conceallevel = 3,
    concealcursor = "nvic",
  },
  -- Send deleted files to the trash instead of permanently deleting them (:help oil-trash)
  delete_to_trash = false,
  -- Skip the confirmation popup for simple operations
  skip_confirm_for_simple_edits = false,
  -- Selecting a new/moved/renamed file or directory will prompt you to save changes first
  prompt_save_on_select_new_entry = true,
  -- Oil will automatically delete hidden buffers after this delay
  -- You can set the delay to false to disable cleanup entirely
  -- Note that the cleanup process only starts when none of the oil buffers are currently displayed
  cleanup_delay_ms = 2000,
  -- Keymaps in oil buffer. Can be any value that `vim.keymap.set` accepts OR a table of keymap
  -- options with a `callback` (e.g. { callback = function() ... end, desc = "", mode = "n" })
  -- Additionally, if it is a string that matches "actions.<name>",
  -- it will use the mapping at require("oil.actions").<name>
  -- Set to `false` to remove a keymap
  -- See :help oil-actions for a list of all available actions
  keymaps = {
    ["g?"] = "actions.show_help",
    ["<CR>"] = "actions.select",
    ["<C-s>"] = "actions.select_vsplit",
    ["<C-h>"] = "actions.select_split",
    ["<C-t>"] = "actions.select_tab",
    ["<C-p>"] = "actions.preview",
    ["<C-c>"] = "actions.close",
    ["<C-l>"] = "actions.refresh",
    ["-"] = "actions.parent",
    ["_"] = "actions.open_cwd",
    ["`"] = "actions.cd",
    ["~"] = "actions.tcd",
    ["gs"] = "actions.change_sort",
    ["gx"] = "actions.open_external",
    ["g."] = "actions.toggle_hidden",
    ["g\\"] = "actions.toggle_trash",
  },
  -- Set to false to disable all of the above keymaps
  use_default_keymaps = true,
  view_options = {
    -- Show files and directories that start with "."
    show_hidden = false,
    -- This function defines what is considered a "hidden" file
    is_hidden_file = function(name, bufnr)
      return vim.startswith(name, ".")
    end,
    -- This function defines what will never be shown, even when `show_hidden` is set
    is_always_hidden = function(name, bufnr)
      return false
    end,
    sort = {
      -- sort order can be "asc" or "desc"
      -- see :help oil-columns to see which columns are sortable
      { "type", "asc" },
      { "name", "asc" },
    },
  },
  -- Configuration for the floating window in oil.open_float
  float = {
    -- Padding around the floating window
    padding = 2,
    max_width = 0,
    max_height = 0,
    border = "rounded",
    win_options = {
      winblend = 0,
    },
    -- This is the config that will be passed to nvim_open_win.
    -- Change values here to customize the layout
    override = function(conf)
      return conf
    end,
  },
  -- Configuration for the actions floating preview window
  preview = {
    -- Width dimensions can be integers or a float between 0 and 1 (e.g. 0.4 for 40%)
    -- min_width and max_width can be a single value or a list of mixed integer/float types.
    -- max_width = {100, 0.8} means "the lesser of 100 columns or 80% of total"
    max_width = 0.9,
    -- min_width = {40, 0.4} means "the greater of 40 columns or 40% of total"
    min_width = { 40, 0.4 },
    -- optionally define an integer/float for the exact width of the preview window
    width = nil,
    -- Height dimensions can be integers or a float between 0 and 1 (e.g. 0.4 for 40%)
    -- min_height and max_height can be a single value or a list of mixed integer/float types.
    -- max_height = {80, 0.9} means "the lesser of 80 columns or 90% of total"
    max_height = 0.9,
    -- min_height = {5, 0.1} means "the greater of 5 columns or 10% of total"
    min_height = { 5, 0.1 },
    -- optionally define an integer/float for the exact height of the preview window
    height = nil,
    border = "rounded",
    win_options = {
      winblend = 0,
    },
  },
  -- Configuration for the floating progress window
  progress = {
    max_width = 0.9,
    min_width = { 40, 0.4 },
    width = nil,
    max_height = { 10, 0.9 },
    min_height = { 5, 0.1 },
    height = nil,
    border = "rounded",
    minimized_border = "none",
    win_options = {
      winblend = 0,
    },
  },
}

-- The adapter API hasn't really stabilized yet. We're not ready to advertise or encourage people to
-- write their own adapters, and so there's no real reason to edit these config options. For that
-- reason, I'm taking them out of the section above so they won't show up in the autogen docs.
default_config.adapters = {
  ["oil://"] = "files",
  ["oil-ssh://"] = "ssh",
  ["oil-trash://"] = "trash",
}
default_config.adapter_aliases = {}

local M = {}

M.setup = function(opts)
  local new_conf = vim.tbl_deep_extend("keep", opts or {}, default_config)
  if not new_conf.use_default_keymaps then
    new_conf.keymaps = opts.keymaps or {}
  end

  if new_conf.delete_to_trash then
    local is_windows = uv.os_uname().version:match("Windows")
    if is_windows then
      vim.notify(
        "oil.nvim: delete_to_trash is true, but trash is not yet supported on Windows.\nDeleted files will be permanently removed",
        vim.log.levels.WARN
      )
      new_conf.delete_to_trash = false
    end
  end

  for k, v in pairs(new_conf) do
    M[k] = v
  end

  M.adapter_to_scheme = {}
  for k, v in pairs(M.adapters) do
    M.adapter_to_scheme[v] = k
  end
  M._adapter_by_scheme = {}
end

---@param scheme nil|string
---@return nil|oil.Adapter
M.get_adapter_by_scheme = function(scheme)
  if not scheme then
    return nil
  end
  if not vim.endswith(scheme, "://") then
    local pieces = vim.split(scheme, "://", { plain = true })
    if #pieces <= 2 then
      scheme = pieces[1] .. "://"
    else
      error(string.format("Malformed url: '%s'", scheme))
    end
  end
  local adapter = M._adapter_by_scheme[scheme]
  if adapter == nil then
    local name = M.adapters[scheme]
    if not name then
      vim.notify(
        string.format("Could not find oil adapter for scheme '%s'", scheme),
        vim.log.levels.ERROR
      )
      return nil
    end
    local ok
    ok, adapter = pcall(require, string.format("oil.adapters.%s", name))
    if ok then
      adapter.name = name
      M._adapter_by_scheme[scheme] = adapter
    else
      M._adapter_by_scheme[scheme] = false
      adapter = false
      vim.notify(string.format("Could not find oil adapter '%s'", name), vim.log.levels.ERROR)
    end
  end
  if adapter then
    return adapter
  else
    return nil
  end
end

return M